This file is indexed.

/usr/share/ada/adainclude/gnatprj/prj-nmsc.adb is in libgnatprj4.9-dev 4.9.2-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
6878
6879
6880
6881
6882
6883
6884
6885
6886
6887
6888
6889
6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
6919
6920
6921
6922
6923
6924
6925
6926
6927
6928
6929
6930
6931
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
6971
6972
6973
6974
6975
6976
6977
6978
6979
6980
6981
6982
6983
6984
6985
6986
6987
6988
6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
7002
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
7023
7024
7025
7026
7027
7028
7029
7030
7031
7032
7033
7034
7035
7036
7037
7038
7039
7040
7041
7042
7043
7044
7045
7046
7047
7048
7049
7050
7051
7052
7053
7054
7055
7056
7057
7058
7059
7060
7061
7062
7063
7064
7065
7066
7067
7068
7069
7070
7071
7072
7073
7074
7075
7076
7077
7078
7079
7080
7081
7082
7083
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
7102
7103
7104
7105
7106
7107
7108
7109
7110
7111
7112
7113
7114
7115
7116
7117
7118
7119
7120
7121
7122
7123
7124
7125
7126
7127
7128
7129
7130
7131
7132
7133
7134
7135
7136
7137
7138
7139
7140
7141
7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
7265
7266
7267
7268
7269
7270
7271
7272
7273
7274
7275
7276
7277
7278
7279
7280
7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
7498
7499
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
7528
7529
7530
7531
7532
7533
7534
7535
7536
7537
7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
7580
7581
7582
7583
7584
7585
7586
7587
7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609
7610
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7626
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
7638
7639
7640
7641
7642
7643
7644
7645
7646
7647
7648
7649
7650
7651
7652
7653
7654
7655
7656
7657
7658
7659
7660
7661
7662
7663
7664
7665
7666
7667
7668
7669
7670
7671
7672
7673
7674
7675
7676
7677
7678
7679
7680
7681
7682
7683
7684
7685
7686
7687
7688
7689
7690
7691
7692
7693
7694
7695
7696
7697
7698
7699
7700
7701
7702
7703
7704
7705
7706
7707
7708
7709
7710
7711
7712
7713
7714
7715
7716
7717
7718
7719
7720
7721
7722
7723
7724
7725
7726
7727
7728
7729
7730
7731
7732
7733
7734
7735
7736
7737
7738
7739
7740
7741
7742
7743
7744
7745
7746
7747
7748
7749
7750
7751
7752
7753
7754
7755
7756
7757
7758
7759
7760
7761
7762
7763
7764
7765
7766
7767
7768
7769
7770
7771
7772
7773
7774
7775
7776
7777
7778
7779
7780
7781
7782
7783
7784
7785
7786
7787
7788
7789
7790
7791
7792
7793
7794
7795
7796
7797
7798
7799
7800
7801
7802
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
7814
7815
7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
7829
7830
7831
7832
7833
7834
7835
7836
7837
7838
7839
7840
7841
7842
7843
7844
7845
7846
7847
7848
7849
7850
7851
7852
7853
7854
7855
7856
7857
7858
7859
7860
7861
7862
7863
7864
7865
7866
7867
7868
7869
7870
7871
7872
7873
7874
7875
7876
7877
7878
7879
7880
7881
7882
7883
7884
7885
7886
7887
7888
7889
7890
7891
7892
7893
7894
7895
7896
7897
7898
7899
7900
7901
7902
7903
7904
7905
7906
7907
7908
7909
7910
7911
7912
7913
7914
7915
7916
7917
7918
7919
7920
7921
7922
7923
7924
7925
7926
7927
7928
7929
7930
7931
7932
7933
7934
7935
7936
7937
7938
7939
7940
7941
7942
7943
7944
7945
7946
7947
7948
7949
7950
7951
7952
7953
7954
7955
7956
7957
7958
7959
7960
7961
7962
7963
7964
7965
7966
7967
7968
7969
7970
7971
7972
7973
7974
7975
7976
7977
7978
7979
7980
7981
7982
7983
7984
7985
7986
7987
7988
7989
7990
7991
7992
7993
7994
7995
7996
7997
7998
7999
8000
8001
8002
8003
8004
8005
8006
8007
8008
8009
8010
8011
8012
8013
8014
8015
8016
8017
8018
8019
8020
8021
8022
8023
8024
8025
8026
8027
8028
8029
8030
8031
8032
8033
8034
8035
8036
8037
8038
8039
8040
8041
8042
8043
8044
8045
8046
8047
8048
8049
8050
8051
8052
8053
8054
8055
8056
8057
8058
8059
8060
8061
8062
8063
8064
8065
8066
8067
8068
8069
8070
8071
8072
8073
8074
8075
8076
8077
8078
8079
8080
8081
8082
8083
8084
8085
8086
8087
8088
8089
8090
8091
8092
8093
8094
8095
8096
8097
8098
8099
8100
8101
8102
8103
8104
8105
8106
8107
8108
8109
8110
8111
8112
8113
8114
8115
8116
8117
8118
8119
8120
8121
8122
8123
8124
8125
8126
8127
8128
8129
8130
8131
8132
8133
8134
8135
8136
8137
8138
8139
8140
8141
8142
8143
8144
8145
8146
8147
8148
8149
8150
8151
8152
8153
8154
8155
8156
8157
8158
8159
8160
8161
8162
8163
8164
8165
8166
8167
8168
8169
8170
8171
8172
8173
8174
8175
8176
8177
8178
8179
8180
8181
8182
8183
8184
8185
8186
8187
8188
8189
8190
8191
8192
8193
8194
8195
8196
8197
8198
8199
8200
8201
8202
8203
8204
8205
8206
8207
8208
8209
8210
8211
8212
8213
8214
8215
8216
8217
8218
8219
8220
8221
8222
8223
8224
8225
8226
8227
8228
8229
8230
8231
8232
8233
8234
8235
8236
8237
8238
8239
8240
8241
8242
8243
8244
8245
8246
8247
8248
8249
8250
8251
8252
8253
8254
8255
8256
8257
8258
8259
8260
8261
8262
8263
8264
8265
8266
8267
8268
8269
8270
8271
8272
8273
8274
8275
8276
8277
8278
8279
8280
8281
8282
8283
8284
8285
8286
8287
8288
8289
8290
8291
8292
8293
8294
8295
8296
8297
8298
8299
8300
8301
8302
8303
8304
8305
8306
8307
8308
8309
8310
8311
8312
8313
8314
8315
8316
8317
8318
8319
8320
8321
8322
8323
8324
8325
8326
8327
8328
8329
8330
8331
8332
8333
8334
8335
8336
8337
8338
8339
8340
8341
8342
8343
8344
8345
8346
8347
8348
8349
8350
8351
8352
8353
8354
8355
8356
8357
8358
8359
8360
8361
8362
8363
8364
8365
8366
8367
8368
8369
8370
8371
8372
8373
8374
8375
8376
8377
8378
8379
8380
8381
8382
8383
8384
8385
8386
8387
8388
8389
8390
8391
8392
8393
8394
8395
8396
8397
8398
8399
8400
8401
8402
8403
8404
8405
8406
8407
8408
8409
8410
8411
8412
8413
8414
8415
8416
8417
8418
8419
8420
8421
8422
8423
8424
8425
8426
8427
8428
8429
8430
8431
8432
8433
8434
8435
8436
8437
8438
8439
8440
8441
8442
8443
8444
8445
8446
8447
8448
8449
8450
8451
8452
8453
8454
8455
8456
8457
8458
8459
8460
8461
8462
8463
8464
8465
8466
8467
8468
8469
8470
8471
8472
8473
8474
8475
8476
8477
8478
8479
8480
8481
8482
8483
8484
8485
8486
8487
8488
8489
8490
8491
8492
8493
8494
8495
8496
8497
8498
8499
8500
8501
8502
8503
8504
8505
8506
8507
8508
8509
8510
8511
8512
8513
8514
8515
8516
8517
8518
8519
8520
8521
8522
8523
8524
8525
8526
8527
8528
8529
8530
8531
8532
8533
8534
8535
8536
8537
8538
8539
8540
8541
8542
8543
8544
8545
8546
8547
8548
8549
8550
8551
8552
8553
8554
8555
8556
8557
8558
8559
8560
8561
8562
8563
8564
8565
8566
8567
8568
8569
8570
8571
8572
8573
8574
8575
8576
8577
8578
8579
8580
8581
8582
8583
8584
8585
8586
8587
8588
8589
8590
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             P R J . N M S C                              --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 2000-2013, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license.          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Err_Vars; use Err_Vars;
with Opt;      use Opt;
with Osint;    use Osint;
with Output;   use Output;
with Prj.Com;
with Prj.Env;  use Prj.Env;
with Prj.Err;  use Prj.Err;
with Prj.Tree; use Prj.Tree;
with Prj.Util; use Prj.Util;
with Sinput.P;
with Snames;   use Snames;
with Targparm; use Targparm;

with Ada;                        use Ada;
with Ada.Characters.Handling;    use Ada.Characters.Handling;
with Ada.Directories;            use Ada.Directories;
with Ada.Strings;                use Ada.Strings;
with Ada.Strings.Fixed;          use Ada.Strings.Fixed;
with Ada.Strings.Maps.Constants; use Ada.Strings.Maps.Constants;

with GNAT.Case_Util;            use GNAT.Case_Util;
with GNAT.Directory_Operations; use GNAT.Directory_Operations;
with GNAT.Dynamic_HTables;
with GNAT.Regexp;               use GNAT.Regexp;
with GNAT.Table;

package body Prj.Nmsc is

   No_Continuation_String : aliased String := "";
   Continuation_String    : aliased String := "\";
   --  Used in Check_Library for continuation error messages at the same
   --  location.

   type Name_Location is record
      Name     : File_Name_Type;
      --  Key is duplicated, so that it is known when using functions Get_First
      --  and Get_Next, as these functions only return an Element.

      Location : Source_Ptr;
      Source   : Source_Id := No_Source;
      Listed   : Boolean := False;
      Found    : Boolean := False;
   end record;

   No_Name_Location : constant Name_Location :=
                        (Name     => No_File,
                         Location => No_Location,
                         Source   => No_Source,
                         Listed   => False,
                         Found    => False);

   package Source_Names_Htable is new GNAT.Dynamic_HTables.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Name_Location,
      No_Element => No_Name_Location,
      Key        => File_Name_Type,
      Hash       => Hash,
      Equal      => "=");
   --  File name information found in string list attribute (Source_Files or
   --  Source_List_File). Used to check that all referenced files were indeed
   --  found on the disk.

   type Unit_Exception is record
      Name : Name_Id;
      --  Key is duplicated, so that it is known when using functions Get_First
      --  and Get_Next, as these functions only return an Element.

      Spec : File_Name_Type;
      Impl : File_Name_Type;
   end record;

   No_Unit_Exception : constant Unit_Exception := (No_Name, No_File, No_File);

   package Unit_Exceptions_Htable is new GNAT.Dynamic_HTables.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Unit_Exception,
      No_Element => No_Unit_Exception,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");
   --  Record special naming schemes for Ada units (name of spec file and name
   --  of implementation file). The elements in this list come from the naming
   --  exceptions specified in the project files.

   type File_Found is record
      File      : File_Name_Type := No_File;
      Excl_File : File_Name_Type := No_File;
      Excl_Line : Natural        := 0;
      Found     : Boolean        := False;
      Location  : Source_Ptr     := No_Location;
   end record;

   No_File_Found : constant File_Found :=
                     (No_File, No_File, 0, False, No_Location);

   package Excluded_Sources_Htable is new GNAT.Dynamic_HTables.Simple_HTable
     (Header_Num => Header_Num,
      Element    => File_Found,
      No_Element => No_File_Found,
      Key        => File_Name_Type,
      Hash       => Hash,
      Equal      => "=");
   --  A hash table to store the base names of excluded files, if any

   package Object_File_Names_Htable is new GNAT.Dynamic_HTables.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Source_Id,
      No_Element => No_Source,
      Key        => File_Name_Type,
      Hash       => Hash,
      Equal      => "=");
   --  A hash table to store the object file names for a project, to check that
   --  two different sources have different object file names.

   type Project_Processing_Data is record
      Project         : Project_Id;
      Source_Names    : Source_Names_Htable.Instance;
      Unit_Exceptions : Unit_Exceptions_Htable.Instance;
      Excluded        : Excluded_Sources_Htable.Instance;

      Source_List_File_Location : Source_Ptr;
      --  Location of the Source_List_File attribute, for error messages
   end record;
   --  This is similar to Tree_Processing_Data, but contains project-specific
   --  information which is only useful while processing the project, and can
   --  be discarded as soon as we have finished processing the project

   type Tree_Processing_Data is record
      Tree             : Project_Tree_Ref;
      Node_Tree        : Prj.Tree.Project_Node_Tree_Ref;
      Flags            : Prj.Processing_Flags;
      In_Aggregate_Lib : Boolean;
   end record;
   --  Temporary data which is needed while parsing a project. It does not need
   --  to be kept in memory once a project has been fully loaded, but is
   --  necessary while performing consistency checks (duplicate sources,...)
   --  This data must be initialized before processing any project, and the
   --  same data is used for processing all projects in the tree.

   type Lib_Data is record
      Name : Name_Id;
      Proj : Project_Id;
      Tree : Project_Tree_Ref;
   end record;

   package Lib_Data_Table is new GNAT.Table
     (Table_Component_Type => Lib_Data,
      Table_Index_Type     => Natural,
      Table_Low_Bound      => 1,
      Table_Initial        => 10,
      Table_Increment      => 100);
   --  A table to record library names in order to check that two library
   --  projects do not have the same library names.

   procedure Initialize
     (Data      : out Tree_Processing_Data;
      Tree      : Project_Tree_Ref;
      Node_Tree : Prj.Tree.Project_Node_Tree_Ref;
      Flags     : Prj.Processing_Flags);
   --  Initialize Data

   procedure Free (Data : in out Tree_Processing_Data);
   --  Free the memory occupied by Data

   procedure Initialize
     (Data    : in out Project_Processing_Data;
      Project : Project_Id);
   procedure Free (Data : in out Project_Processing_Data);
   --  Initialize or free memory for a project-specific data

   procedure Find_Excluded_Sources
     (Project : in out Project_Processing_Data;
      Data    : in out Tree_Processing_Data);
   --  Find the list of files that should not be considered as source files
   --  for this project. Sets the list in the Project.Excluded_Sources_Htable.

   procedure Override_Kind (Source : Source_Id; Kind : Source_Kind);
   --  Override the reference kind for a source file. This properly updates
   --  the unit data if necessary.

   procedure Load_Naming_Exceptions
     (Project : in out Project_Processing_Data;
      Data    : in out Tree_Processing_Data);
   --  All source files in Data.First_Source are considered as naming
   --  exceptions, and copied into the Source_Names and Unit_Exceptions tables
   --  as appropriate.

   type Search_Type is (Search_Files, Search_Directories);

   generic
      with procedure Callback
        (Path          : Path_Information;
         Pattern_Index : Natural);
   procedure Expand_Subdirectory_Pattern
     (Project       : Project_Id;
      Data          : in out Tree_Processing_Data;
      Patterns      : String_List_Id;
      Ignore        : String_List_Id;
      Search_For    : Search_Type;
      Resolve_Links : Boolean);
   --  Search the subdirectories of Project's directory for files or
   --  directories that match the globbing patterns found in Patterns (for
   --  instance "**/*.adb"). Typically, Patterns will be the value of the
   --  Source_Dirs or Excluded_Source_Dirs attributes.
   --
   --  Every time such a file or directory is found, the callback is called.
   --  Resolve_Links indicates whether we should resolve links while
   --  normalizing names.
   --
   --  In the callback, Pattern_Index is the index within Patterns where the
   --  expanded pattern was found (1 for the first element of Patterns and
   --  all its matching directories, then 2,...).
   --
   --  We use a generic and not an access-to-subprogram because in some cases
   --  this code is compiled with the restriction No_Implicit_Dynamic_Code.
   --  An error message is raised if a pattern does not match any file.

   procedure Add_Source
     (Id                  : out Source_Id;
      Data                : in out Tree_Processing_Data;
      Project             : Project_Id;
      Source_Dir_Rank     : Natural;
      Lang_Id             : Language_Ptr;
      Kind                : Source_Kind;
      File_Name           : File_Name_Type;
      Display_File        : File_Name_Type;
      Naming_Exception    : Naming_Exception_Type := No;
      Path                : Path_Information      := No_Path_Information;
      Alternate_Languages : Language_List         := null;
      Unit                : Name_Id               := No_Name;
      Index               : Int                   := 0;
      Locally_Removed     : Boolean               := False;
      Location            : Source_Ptr            := No_Location);
   --  Add a new source to the different lists: list of all sources in the
   --  project tree, list of source of a project and list of sources of a
   --  language. If Path is specified, the file is also added to
   --  Source_Paths_HT. Location is used for error messages

   function Canonical_Case_File_Name (Name : Name_Id) return File_Name_Type;
   --  Same as Osint.Canonical_Case_File_Name but applies to Name_Id.
   --  This alters Name_Buffer.

   function Suffix_Matches
     (Filename : String;
      Suffix   : File_Name_Type) return Boolean;
   --  True if the file name ends with the given suffix. Always returns False
   --  if Suffix is No_Name.

   procedure Replace_Into_Name_Buffer
     (Str         : String;
      Pattern     : String;
      Replacement : Character);
   --  Copy Str into Name_Buffer, replacing Pattern with Replacement. Str is
   --  converted to lower-case at the same time.

   procedure Check_Abstract_Project
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  Check abstract projects attributes

   procedure Check_Configuration
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  Check the configuration attributes for the project

   procedure Check_If_Externally_Built
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  Check attribute Externally_Built of project Project in project tree
   --  Data.Tree and modify its data Data if it has the value "true".

   procedure Check_Interfaces
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  If a list of sources is specified in attribute Interfaces, set
   --  In_Interfaces only for the sources specified in the list.

   procedure Check_Library_Attributes
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  Check the library attributes of project Project in project tree
   --  and modify its data Data accordingly.

   procedure Check_Package_Naming
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  Check the naming scheme part of Data, and initialize the naming scheme
   --  data in the config of the various languages.

   procedure Check_Programming_Languages
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  Check attribute Languages for the project with data Data in project
   --  tree Data.Tree and set the components of Data for all the programming
   --  languages indicated in attribute Languages, if any.

   procedure Check_Stand_Alone_Library
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  Check if project Project in project tree Data.Tree is a Stand-Alone
   --  Library project, and modify its data Data accordingly if it is one.

   procedure Check_Unit_Name (Name : String; Unit : out Name_Id);
   --  Check that a name is a valid unit name

   function Compute_Directory_Last (Dir : String) return Natural;
   --  Return the index of the last significant character in Dir. This is used
   --  to avoid duplicate '/' (slash) characters at the end of directory names.

   procedure Search_Directories
     (Project         : in out Project_Processing_Data;
      Data            : in out Tree_Processing_Data;
      For_All_Sources : Boolean);
   --  Search the source directories to find the sources. If For_All_Sources is
   --  True, check each regular file name against the naming schemes of the
   --  various languages. Otherwise consider only the file names in hash table
   --  Source_Names. If Allow_Duplicate_Basenames then files with identical
   --  base names are permitted within a project for source-based languages
   --  (never for unit based languages).

   procedure Check_File
     (Project           : in out Project_Processing_Data;
      Data              : in out Tree_Processing_Data;
      Source_Dir_Rank   : Natural;
      Path              : Path_Name_Type;
      Display_Path      : Path_Name_Type;
      File_Name         : File_Name_Type;
      Display_File_Name : File_Name_Type;
      Locally_Removed   : Boolean;
      For_All_Sources   : Boolean);
   --  Check if file File_Name is a valid source of the project. This is used
   --  in multi-language mode only. When the file matches one of the naming
   --  schemes, it is added to various htables through Add_Source and to
   --  Source_Paths_Htable.
   --
   --  File_Name is the same as Display_File_Name, but has been normalized.
   --  They do not include the directory information.
   --
   --  Path and Display_Path on the other hand are the full path to the file.
   --  Path must have been normalized (canonical casing and possibly links
   --  resolved).
   --
   --  Source_Directory is the directory in which the file was found. It is
   --  neither normalized nor has had links resolved, and must not end with a
   --  a directory separator, to avoid duplicates later on.
   --
   --  If For_All_Sources is True, then all possible file names are analyzed
   --  otherwise only those currently set in the Source_Names hash table.

   procedure Check_File_Naming_Schemes
     (Project               : Project_Processing_Data;
      File_Name             : File_Name_Type;
      Alternate_Languages   : out Language_List;
      Language              : out Language_Ptr;
      Display_Language_Name : out Name_Id;
      Unit                  : out Name_Id;
      Lang_Kind             : out Language_Kind;
      Kind                  : out Source_Kind);
   --  Check if the file name File_Name conforms to one of the naming schemes
   --  of the project. If the file does not match one of the naming schemes,
   --  set Language to No_Language_Index. Filename is the name of the file
   --  being investigated. It has been normalized (case-folded). File_Name is
   --  the same value.

   procedure Get_Directories
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  Get the object directory, the exec directory and the source directories
   --  of a project.

   procedure Get_Mains
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data);
   --  Get the mains of a project from attribute Main, if it exists, and put
   --  them in the project data.

   procedure Get_Sources_From_File
     (Path     : String;
      Location : Source_Ptr;
      Project  : in out Project_Processing_Data;
      Data     : in out Tree_Processing_Data);
   --  Get the list of sources from a text file and put them in hash table
   --  Source_Names.

   procedure Find_Sources
     (Project : in out Project_Processing_Data;
      Data    : in out Tree_Processing_Data);
   --  Process the Source_Files and Source_List_File attributes, and store the
   --  list of source files into the Source_Names htable. When these attributes
   --  are not defined, find all files matching the naming schemes in the
   --  source directories. If Allow_Duplicate_Basenames, then files with the
   --  same base names are authorized within a project for source-based
   --  languages (never for unit based languages)

   procedure Compute_Unit_Name
     (File_Name : File_Name_Type;
      Naming    : Lang_Naming_Data;
      Kind      : out Source_Kind;
      Unit      : out Name_Id;
      Project   : Project_Processing_Data);
   --  Check whether the file matches the naming scheme. If it does,
   --  compute its unit name. If Unit is set to No_Name on exit, none of the
   --  other out parameters are relevant.

   procedure Check_Illegal_Suffix
     (Project         : Project_Id;
      Suffix          : File_Name_Type;
      Dot_Replacement : File_Name_Type;
      Attribute_Name  : String;
      Location        : Source_Ptr;
      Data            : in out Tree_Processing_Data);
   --  Display an error message if the given suffix is illegal for some reason.
   --  The name of the attribute we are testing is specified in Attribute_Name,
   --  which is used in the error message. Location is the location where the
   --  suffix is defined.

   procedure Locate_Directory
     (Project          : Project_Id;
      Name             : File_Name_Type;
      Path             : out Path_Information;
      Dir_Exists       : out Boolean;
      Data             : in out Tree_Processing_Data;
      Create           : String := "";
      Location         : Source_Ptr := No_Location;
      Must_Exist       : Boolean := True;
      Externally_Built : Boolean := False);
   --  Locate a directory. Name is the directory name. Relative paths are
   --  resolved relative to the project's directory. If the directory does not
   --  exist and Setup_Projects is True and Create is a non null string, an
   --  attempt is made to create the directory. If the directory does not
   --  exist, it is either created if Setup_Projects is False (and then
   --  returned), or simply returned without checking for its existence (if
   --  Must_Exist is False) or No_Path_Information is returned. In all cases,
   --  Dir_Exists indicates whether the directory now exists. Create is also
   --  used for debugging traces to show which path we are computing.

   procedure Look_For_Sources
     (Project : in out Project_Processing_Data;
      Data    : in out Tree_Processing_Data);
   --  Find all the sources of project Project in project tree Data.Tree and
   --  update its Data accordingly. This assumes that the special naming
   --  exceptions have already been processed.

   function Path_Name_Of
     (File_Name : File_Name_Type;
      Directory : Path_Name_Type) return String;
   --  Returns the path name of a (non project) file. Returns an empty string
   --  if file cannot be found.

   procedure Remove_Source
     (Tree        : Project_Tree_Ref;
      Id          : Source_Id;
      Replaced_By : Source_Id);
   --  Remove a file from the list of sources of a project. This might be
   --  because the file is replaced by another one in an extending project,
   --  or because a file was added as a naming exception but was not found
   --  in the end.

   procedure Report_No_Sources
     (Project      : Project_Id;
      Lang_Name    : String;
      Data         : Tree_Processing_Data;
      Location     : Source_Ptr;
      Continuation : Boolean := False);
   --  Report an error or a warning depending on the value of When_No_Sources
   --  when there are no sources for language Lang_Name.

   procedure Show_Source_Dirs
     (Project : Project_Id;
      Shared  : Shared_Project_Tree_Data_Access);
   --  List all the source directories of a project

   procedure Write_Attr (Name, Value : String);
   --  Debug print a value for a specific property. Does nothing when not in
   --  debug mode

   procedure Error_Or_Warning
     (Flags    : Processing_Flags;
      Kind     : Error_Warning;
      Msg      : String;
      Location : Source_Ptr;
      Project  : Project_Id);
   --  Emits either an error or warning message (or nothing), depending on Kind

   function No_Space_Img (N : Natural) return String;
   --  Image of a Natural without the initial space

   ----------------------
   -- Error_Or_Warning --
   ----------------------

   procedure Error_Or_Warning
     (Flags    : Processing_Flags;
      Kind     : Error_Warning;
      Msg      : String;
      Location : Source_Ptr;
      Project  : Project_Id) is
   begin
      case Kind is
         when Error   => Error_Msg (Flags, Msg, Location, Project);
         when Warning => Error_Msg (Flags, "?" & Msg, Location, Project);
         when Silent  => null;
      end case;
   end Error_Or_Warning;

   ------------------------------
   -- Replace_Into_Name_Buffer --
   ------------------------------

   procedure Replace_Into_Name_Buffer
     (Str         : String;
      Pattern     : String;
      Replacement : Character)
   is
      Max : constant Integer := Str'Last - Pattern'Length + 1;
      J   : Positive;

   begin
      Name_Len := 0;

      J := Str'First;
      while J <= Str'Last loop
         Name_Len := Name_Len + 1;

         if J <= Max
           and then Str (J .. J + Pattern'Length - 1) = Pattern
         then
            Name_Buffer (Name_Len) := Replacement;
            J := J + Pattern'Length;

         else
            Name_Buffer (Name_Len) := GNAT.Case_Util.To_Lower (Str (J));
            J := J + 1;
         end if;
      end loop;
   end Replace_Into_Name_Buffer;

   --------------------
   -- Suffix_Matches --
   --------------------

   function Suffix_Matches
     (Filename : String;
      Suffix   : File_Name_Type) return Boolean
   is
      Min_Prefix_Length : Natural := 0;

   begin
      if Suffix = No_File or else Suffix = Empty_File then
         return False;
      end if;

      declare
         Suf : String := Get_Name_String (Suffix);

      begin
         --  On non case-sensitive systems, use proper suffix casing

         Canonical_Case_File_Name (Suf);

         --  The file name must end with the suffix (which is not an extension)
         --  For instance a suffix "configure.in" must match a file with the
         --  same name. To avoid dummy cases, though, a suffix starting with
         --  '.' requires a file that is at least one character longer ('.cpp'
         --  should not match a file with the same name).

         if Suf (Suf'First) = '.' then
            Min_Prefix_Length := 1;
         end if;

         return Filename'Length >= Suf'Length + Min_Prefix_Length
           and then
             Filename (Filename'Last - Suf'Length + 1 .. Filename'Last) = Suf;
      end;
   end Suffix_Matches;

   ----------------
   -- Write_Attr --
   ----------------

   procedure Write_Attr (Name, Value : String) is
   begin
      if Current_Verbosity = High then
         Debug_Output (Name & " = """ & Value & '"');
      end if;
   end Write_Attr;

   ----------------
   -- Add_Source --
   ----------------

   procedure Add_Source
     (Id                  : out Source_Id;
      Data                : in out Tree_Processing_Data;
      Project             : Project_Id;
      Source_Dir_Rank     : Natural;
      Lang_Id             : Language_Ptr;
      Kind                : Source_Kind;
      File_Name           : File_Name_Type;
      Display_File        : File_Name_Type;
      Naming_Exception    : Naming_Exception_Type := No;
      Path                : Path_Information      := No_Path_Information;
      Alternate_Languages : Language_List         := null;
      Unit                : Name_Id               := No_Name;
      Index               : Int                   := 0;
      Locally_Removed     : Boolean               := False;
      Location            : Source_Ptr            := No_Location)
   is
      Config            : constant Language_Config := Lang_Id.Config;
      UData             : Unit_Index;
      Add_Src           : Boolean;
      Source            : Source_Id;
      Prev_Unit         : Unit_Index := No_Unit_Index;
      Source_To_Replace : Source_Id := No_Source;

   begin
      --  Check if the same file name or unit is used in the prj tree

      Add_Src := True;

      if Unit /= No_Name then
         Prev_Unit := Units_Htable.Get (Data.Tree.Units_HT, Unit);
      end if;

      if Prev_Unit /= No_Unit_Index
        and then (Kind = Impl or else Kind = Spec)
        and then Prev_Unit.File_Names (Kind) /= null
      then
         --  Suspicious, we need to check later whether this is authorized

         Add_Src := False;
         Source := Prev_Unit.File_Names (Kind);

      else
         Source := Source_Files_Htable.Get
           (Data.Tree.Source_Files_HT, File_Name);

         if Source /= No_Source and then Source.Index = Index then
            Add_Src := False;
         end if;
      end if;

      --  Always add the source if it is locally removed, to avoid incorrect
      --  duplicate checks.

      if Locally_Removed then
         Add_Src := True;

         --  A locally removed source may first replace a source in a project
         --  being extended.

         if Source /= No_Source
           and then Is_Extending (Project, Source.Project)
           and then Naming_Exception /= Inherited
         then
            Source_To_Replace := Source;
         end if;

      else
         --  Duplication of file/unit in same project is allowed if order of
         --  source directories is known, or if there is no compiler for the
         --  language.

         if Add_Src = False then
            Add_Src := True;

            if Project = Source.Project then
               if Prev_Unit = No_Unit_Index then
                  if Data.Flags.Allow_Duplicate_Basenames then
                     Add_Src := True;

                  elsif Lang_Id.Config.Compiler_Driver = Empty_File then
                     Add_Src := True;

                  elsif Source_Dir_Rank /= Source.Source_Dir_Rank then
                     Add_Src := False;

                  else
                     Error_Msg_File_1 := File_Name;
                     Error_Msg
                       (Data.Flags, "duplicate source file name {",
                        Location, Project);
                     Add_Src := False;
                  end if;

               else
                  if Source_Dir_Rank /= Source.Source_Dir_Rank then
                     Add_Src := False;

                     --  We might be seeing the same file through a different
                     --  path (for instance because of symbolic links).

                  elsif Source.Path.Name /= Path.Name then
                     if not Source.Duplicate_Unit then
                        Error_Msg_Name_1 := Unit;
                        Error_Msg
                          (Data.Flags,
                           "\duplicate unit %%",
                           Location,
                           Project);
                        Source.Duplicate_Unit := True;
                     end if;

                     Add_Src := False;
                  end if;
               end if;

               --  Do not allow the same unit name in different projects,
               --  except if one is extending the other.

               --  For a file based language, the same file name replaces a
               --  file in a project being extended, but it is allowed to have
               --  the same file name in unrelated projects.

            elsif Is_Extending (Project, Source.Project) then
               if not Locally_Removed
                 and then Naming_Exception /= Inherited
               then
                  Source_To_Replace := Source;
               end if;

            elsif Prev_Unit /= No_Unit_Index
              and then Prev_Unit.File_Names (Kind) /= null
              and then not Source.Locally_Removed
              and then Source.Replaced_By = No_Source
              and then not Data.In_Aggregate_Lib
            then
               --  Path is set if this is a source we found on the disk, in
               --  which case we can provide more explicit error message. Path
               --  is unset when the source is added from one of the naming
               --  exceptions in the project.

               if Path /= No_Path_Information then
                  Error_Msg_Name_1 := Unit;
                  Error_Msg
                    (Data.Flags,
                     "unit %% cannot belong to several projects",
                     Location, Project);

                  Error_Msg_Name_1 := Project.Name;
                  Error_Msg_Name_2 := Name_Id (Path.Display_Name);
                  Error_Msg
                    (Data.Flags, "\  project %%, %%", Location, Project);

                  Error_Msg_Name_1 := Source.Project.Name;
                  Error_Msg_Name_2 := Name_Id (Source.Path.Display_Name);
                  Error_Msg
                    (Data.Flags, "\  project %%, %%", Location, Project);

               else
                  Error_Msg_Name_1 := Unit;
                  Error_Msg_Name_2 := Source.Project.Name;
                  Error_Msg
                    (Data.Flags, "unit %% already belongs to project %%",
                     Location, Project);
               end if;

               Add_Src := False;

            elsif not Source.Locally_Removed
              and then Source.Replaced_By /= No_Source
              and then not Data.Flags.Allow_Duplicate_Basenames
              and then Lang_Id.Config.Kind = Unit_Based
              and then Source.Language.Config.Kind = Unit_Based
              and then not Data.In_Aggregate_Lib
            then
               Error_Msg_File_1 := File_Name;
               Error_Msg_File_2 := File_Name_Type (Source.Project.Name);
               Error_Msg
                 (Data.Flags,
                  "{ is already a source of project {", Location, Project);

               --  Add the file anyway, to avoid further warnings like
               --  "language unknown".

               Add_Src := True;
            end if;
         end if;
      end if;

      if not Add_Src then
         return;
      end if;

      --  Add the new file

      Id := new Source_Data;

      if Current_Verbosity = High then
         Debug_Indent;
         Write_Str ("adding source File: ");
         Write_Str (Get_Name_String (Display_File));

         if Index /= 0 then
            Write_Str (" at" & Index'Img);
         end if;

         if Lang_Id.Config.Kind = Unit_Based then
            Write_Str (" Unit: ");

            --  ??? in gprclean, it seems we sometimes pass an empty Unit name
            --  (see test extended_projects).

            if Unit /= No_Name then
               Write_Str (Get_Name_String (Unit));
            end if;

            Write_Str (" Kind: ");
            Write_Str (Source_Kind'Image (Kind));
         end if;

         Write_Eol;
      end if;

      Id.Project             := Project;
      Id.Location            := Location;
      Id.Source_Dir_Rank     := Source_Dir_Rank;
      Id.Language            := Lang_Id;
      Id.Kind                := Kind;
      Id.Alternate_Languages := Alternate_Languages;
      Id.Locally_Removed     := Locally_Removed;
      Id.Index               := Index;
      Id.File                := File_Name;
      Id.Display_File        := Display_File;
      Id.Dep_Name            := Dependency_Name
                                  (File_Name, Lang_Id.Config.Dependency_Kind);
      Id.Naming_Exception    := Naming_Exception;
      Id.Object              := Object_Name
                                  (File_Name, Config.Object_File_Suffix);
      Id.Switches            := Switches_Name (File_Name);

      --  Add the source id to the Unit_Sources_HT hash table, if the unit name
      --  is not null.

      if Unit /= No_Name then

         --  Note: we might be creating a dummy unit here, when we in fact have
         --  a separate. For instance, file file-bar.adb will initially be
         --  assumed to be the IMPL of unit "file.bar". Only later on (in
         --  Check_Object_Files) will we parse those units that only have an
         --  impl and no spec to make sure whether we have a Separate in fact
         --  (that significantly reduces the number of times we need to parse
         --  the files, since we are then only interested in those with no
         --  spec). We still need those dummy units in the table, since that's
         --  the name we find in the ALI file

         UData := Units_Htable.Get (Data.Tree.Units_HT, Unit);

         if UData = No_Unit_Index then
            UData := new Unit_Data;
            UData.Name := Unit;

            if Naming_Exception /= Inherited then
               Units_Htable.Set (Data.Tree.Units_HT, Unit, UData);
            end if;
         end if;

         Id.Unit := UData;

         --  Note that this updates Unit information as well

         if Naming_Exception /= Inherited and then not Locally_Removed then
            Override_Kind (Id, Kind);
         end if;
      end if;

      if Path /= No_Path_Information then
         Id.Path := Path;
         Source_Paths_Htable.Set (Data.Tree.Source_Paths_HT, Path.Name, Id);
      end if;

      Id.Next_With_File_Name :=
        Source_Files_Htable.Get (Data.Tree.Source_Files_HT, File_Name);
      Source_Files_Htable.Set (Data.Tree.Source_Files_HT, File_Name, Id);

      if Index /= 0 then
         Project.Has_Multi_Unit_Sources := True;
      end if;

      --  Add the source to the language list

      Id.Next_In_Lang := Lang_Id.First_Source;
      Lang_Id.First_Source := Id;

      if Source_To_Replace /= No_Source then
         Remove_Source (Data.Tree, Source_To_Replace, Id);
      end if;

      if Data.Tree.Replaced_Source_Number > 0
        and then
          Replaced_Source_HTable.Get
            (Data.Tree.Replaced_Sources, Id.File) /= No_File
      then
         Replaced_Source_HTable.Remove (Data.Tree.Replaced_Sources, Id.File);
         Data.Tree.Replaced_Source_Number :=
           Data.Tree.Replaced_Source_Number - 1;
      end if;
   end Add_Source;

   ------------------------------
   -- Canonical_Case_File_Name --
   ------------------------------

   function Canonical_Case_File_Name (Name : Name_Id) return File_Name_Type is
   begin
      if Osint.File_Names_Case_Sensitive then
         return File_Name_Type (Name);
      else
         Get_Name_String (Name);
         Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
         return Name_Find;
      end if;
   end Canonical_Case_File_Name;

   ---------------------------------
   -- Process_Aggregated_Projects --
   ---------------------------------

   procedure Process_Aggregated_Projects
     (Tree      : Project_Tree_Ref;
      Project   : Project_Id;
      Node_Tree : Prj.Tree.Project_Node_Tree_Ref;
      Flags     : Processing_Flags)
   is
      Data : Tree_Processing_Data :=
               (Tree             => Tree,
                Node_Tree        => Node_Tree,
                Flags            => Flags,
                In_Aggregate_Lib => False);

      Project_Files : constant Prj.Variable_Value :=
                        Prj.Util.Value_Of
                          (Snames.Name_Project_Files,
                           Project.Decl.Attributes,
                           Tree.Shared);

      Project_Path_For_Aggregate : Prj.Env.Project_Search_Path;

      procedure Found_Project_File (Path : Path_Information; Rank : Natural);
      --  Called for each project file aggregated by Project

      procedure Expand_Project_Files is
        new Expand_Subdirectory_Pattern (Callback => Found_Project_File);
      --  Search for all project files referenced by the patterns given in
      --  parameter. Calls Found_Project_File for each of them.

      ------------------------
      -- Found_Project_File --
      ------------------------

      procedure Found_Project_File (Path : Path_Information; Rank : Natural) is
         pragma Unreferenced (Rank);

      begin
         if Path.Name /= Project.Path.Name then
            Debug_Output ("aggregates: ", Name_Id (Path.Display_Name));

            --  For usual "with" statement, this phase will have been done when
            --  parsing the project itself. However, for aggregate projects, we
            --  can only do this when processing the aggregate project, since
            --  the exact list of project files or project directories can
            --  depend on scenario variables.
            --
            --  We only load the projects explicitly here, but do not process
            --  them. For the processing, Prj.Proc will take care of processing
            --  them, within the same call to Recursive_Process (thus avoiding
            --  the processing of a given project multiple times).
            --
            --  ??? We might already have loaded the project

            Add_Aggregated_Project (Project, Path => Path.Name);

         else
            Debug_Output ("pattern returned the aggregate itself, ignored");
         end if;
      end Found_Project_File;

   --  Start of processing for Check_Aggregate_Project

   begin
      pragma Assert (Project.Qualifier in Aggregate_Project);

      if Project_Files.Default then
         Error_Msg_Name_1 := Snames.Name_Project_Files;
         Error_Msg
           (Flags,
            "Attribute %% must be specified in aggregate project",
            Project.Location, Project);
         return;
      end if;

      --  The aggregated projects are only searched relative to the directory
      --  of the aggregate project, not in the default project path.

      Initialize_Empty (Project_Path_For_Aggregate);

      Free (Project.Aggregated_Projects);

      --  Look for aggregated projects. For similarity with source files and
      --  dirs, the aggregated project files are not searched for on the
      --  project path, and are only found through the path specified in
      --  the Project_Files attribute.

      Expand_Project_Files
        (Project       => Project,
         Data          => Data,
         Patterns      => Project_Files.Values,
         Ignore        => Nil_String,
         Search_For    => Search_Files,
         Resolve_Links => Opt.Follow_Links_For_Files);

      Free (Project_Path_For_Aggregate);
   end Process_Aggregated_Projects;

   ----------------------------
   -- Check_Abstract_Project --
   ----------------------------

   procedure Check_Abstract_Project
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Source_Dirs      : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Source_Dirs,
                              Project.Decl.Attributes, Shared);
      Source_Files     : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Source_Files,
                              Project.Decl.Attributes, Shared);
      Source_List_File : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Source_List_File,
                              Project.Decl.Attributes, Shared);
      Languages        : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Languages,
                              Project.Decl.Attributes, Shared);

   begin
      if Project.Source_Dirs /= Nil_String then
         if Source_Dirs.Values  = Nil_String
           and then Source_Files.Values = Nil_String
           and then Languages.Values = Nil_String
           and then Source_List_File.Default
         then
            Project.Source_Dirs := Nil_String;

         else
            Error_Msg
              (Data.Flags,
               "at least one of Source_Files, Source_Dirs or Languages "
               & "must be declared empty for an abstract project",
               Project.Location, Project);
         end if;
      end if;
   end Check_Abstract_Project;

   -------------------------
   -- Check_Configuration --
   -------------------------

   procedure Check_Configuration
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared          : constant Shared_Project_Tree_Data_Access :=
                          Data.Tree.Shared;

      Dot_Replacement : File_Name_Type := No_File;
      Casing          : Casing_Type    := All_Lower_Case;
      Separate_Suffix : File_Name_Type := No_File;

      Lang_Index : Language_Ptr := No_Language_Index;
      --  The index of the language data being checked

      Prev_Index : Language_Ptr := No_Language_Index;
      --  The index of the previous language

      procedure Process_Project_Level_Simple_Attributes;
      --  Process the simple attributes at the project level

      procedure Process_Project_Level_Array_Attributes;
      --  Process the associate array attributes at the project level

      procedure Process_Packages;
      --  Read the packages of the project

      ----------------------
      -- Process_Packages --
      ----------------------

      procedure Process_Packages is
         Packages : Package_Id;
         Element  : Package_Element;

         procedure Process_Binder (Arrays : Array_Id);
         --  Process the associated array attributes of package Binder

         procedure Process_Builder (Attributes : Variable_Id);
         --  Process the simple attributes of package Builder

         procedure Process_Clean (Attributes : Variable_Id);
         --  Process the simple attributes of package Clean

         procedure Process_Clean  (Arrays : Array_Id);
         --  Process the associated array attributes of package Clean

         procedure Process_Compiler (Arrays : Array_Id);
         --  Process the associated array attributes of package Compiler

         procedure Process_Naming (Attributes : Variable_Id);
         --  Process the simple attributes of package Naming

         procedure Process_Naming (Arrays : Array_Id);
         --  Process the associated array attributes of package Naming

         procedure Process_Linker (Attributes : Variable_Id);
         --  Process the simple attributes of package Linker of a
         --  configuration project.

         --------------------
         -- Process_Binder --
         --------------------

         procedure Process_Binder (Arrays : Array_Id) is
            Current_Array_Id : Array_Id;
            Current_Array    : Array_Data;
            Element_Id       : Array_Element_Id;
            Element          : Array_Element;

         begin
            --  Process the associative array attribute of package Binder

            Current_Array_Id := Arrays;
            while Current_Array_Id /= No_Array loop
               Current_Array := Shared.Arrays.Table (Current_Array_Id);

               Element_Id := Current_Array.Value;
               while Element_Id /= No_Array_Element loop
                  Element := Shared.Array_Elements.Table (Element_Id);

                  if Element.Index /= All_Other_Names then

                     --  Get the name of the language

                     Lang_Index :=
                       Get_Language_From_Name
                         (Project, Get_Name_String (Element.Index));

                     if Lang_Index /= No_Language_Index then
                        case Current_Array.Name is
                           when Name_Driver =>

                              --  Attribute Driver (<language>)

                              Lang_Index.Config.Binder_Driver :=
                                File_Name_Type (Element.Value.Value);

                           when Name_Required_Switches =>
                              Put
                                (Into_List =>
                                   Lang_Index.Config.Binder_Required_Switches,
                                 From_List => Element.Value.Values,
                                 In_Tree   => Data.Tree);

                           when Name_Prefix =>

                              --  Attribute Prefix (<language>)

                              Lang_Index.Config.Binder_Prefix :=
                                Element.Value.Value;

                           when Name_Objects_Path =>

                              --  Attribute Objects_Path (<language>)

                              Lang_Index.Config.Objects_Path :=
                                Element.Value.Value;

                           when Name_Objects_Path_File =>

                              --  Attribute Objects_Path (<language>)

                              Lang_Index.Config.Objects_Path_File :=
                                Element.Value.Value;

                           when others =>
                              null;
                        end case;
                     end if;
                  end if;

                  Element_Id := Element.Next;
               end loop;

               Current_Array_Id := Current_Array.Next;
            end loop;
         end Process_Binder;

         ---------------------
         -- Process_Builder --
         ---------------------

         procedure Process_Builder (Attributes : Variable_Id) is
            Attribute_Id : Variable_Id;
            Attribute    : Variable;

         begin
            --  Process non associated array attribute from package Builder

            Attribute_Id := Attributes;
            while Attribute_Id /= No_Variable loop
               Attribute := Shared.Variable_Elements.Table (Attribute_Id);

               if not Attribute.Value.Default then
                  if Attribute.Name = Name_Executable_Suffix then

                     --  Attribute Executable_Suffix: the suffix of the
                     --  executables.

                     Project.Config.Executable_Suffix :=
                       Attribute.Value.Value;
                  end if;
               end if;

               Attribute_Id := Attribute.Next;
            end loop;
         end Process_Builder;

         -------------------
         -- Process_Clean --
         -------------------

         procedure Process_Clean (Attributes : Variable_Id) is
            Attribute_Id : Variable_Id;
            Attribute    : Variable;
            List         : String_List_Id;

         begin
            --  Process non associated array attributes from package Clean

            Attribute_Id := Attributes;
            while Attribute_Id /= No_Variable loop
               Attribute := Shared.Variable_Elements.Table (Attribute_Id);

               if not Attribute.Value.Default then
                  if Attribute.Name = Name_Artifacts_In_Exec_Dir then

                     --  Attribute Artifacts_In_Exec_Dir: the list of file
                     --  names to be cleaned in the exec dir of the main
                     --  project.

                     List := Attribute.Value.Values;

                     if List /= Nil_String then
                        Put (Into_List =>
                               Project.Config.Artifacts_In_Exec_Dir,
                             From_List => List,
                             In_Tree   => Data.Tree);
                     end if;

                  elsif Attribute.Name = Name_Artifacts_In_Object_Dir then

                     --  Attribute Artifacts_In_Exec_Dir: the list of file
                     --  names to be cleaned in the object dir of every
                     --  project.

                     List := Attribute.Value.Values;

                     if List /= Nil_String then
                        Put (Into_List =>
                               Project.Config.Artifacts_In_Object_Dir,
                             From_List => List,
                             In_Tree   => Data.Tree);
                     end if;
                  end if;
               end if;

               Attribute_Id := Attribute.Next;
            end loop;
         end Process_Clean;

         procedure Process_Clean  (Arrays : Array_Id) is
            Current_Array_Id : Array_Id;
            Current_Array    : Array_Data;
            Element_Id       : Array_Element_Id;
            Element          : Array_Element;
            List             : String_List_Id;

         begin
            --  Process the associated array attributes of package Clean

            Current_Array_Id := Arrays;
            while Current_Array_Id /= No_Array loop
               Current_Array := Shared.Arrays.Table (Current_Array_Id);

               Element_Id := Current_Array.Value;
               while Element_Id /= No_Array_Element loop
                  Element := Shared.Array_Elements.Table (Element_Id);

                  --  Get the name of the language

                  Lang_Index :=
                    Get_Language_From_Name
                      (Project, Get_Name_String (Element.Index));

                  if Lang_Index /= No_Language_Index then
                     case Current_Array.Name is

                        --  Attribute Object_Artifact_Extensions (<language>)

                        when Name_Object_Artifact_Extensions =>
                           List := Element.Value.Values;

                           if List /= Nil_String then
                              Put (Into_List =>
                                     Lang_Index.Config.Clean_Object_Artifacts,
                                   From_List => List,
                                   In_Tree   => Data.Tree);
                           end if;

                        --  Attribute Source_Artifact_Extensions (<language>)

                        when Name_Source_Artifact_Extensions =>
                           List := Element.Value.Values;

                           if List /= Nil_String then
                              Put (Into_List =>
                                     Lang_Index.Config.Clean_Source_Artifacts,
                                   From_List => List,
                                   In_Tree   => Data.Tree);
                           end if;

                        when others =>
                           null;
                     end case;
                  end if;

                  Element_Id := Element.Next;
               end loop;

               Current_Array_Id := Current_Array.Next;
            end loop;
         end Process_Clean;

         ----------------------
         -- Process_Compiler --
         ----------------------

         procedure Process_Compiler (Arrays : Array_Id) is
            Current_Array_Id : Array_Id;
            Current_Array    : Array_Data;
            Element_Id       : Array_Element_Id;
            Element          : Array_Element;
            List             : String_List_Id;

         begin
            --  Process the associative array attribute of package Compiler

            Current_Array_Id := Arrays;
            while Current_Array_Id /= No_Array loop
               Current_Array := Shared.Arrays.Table (Current_Array_Id);

               Element_Id := Current_Array.Value;
               while Element_Id /= No_Array_Element loop
                  Element := Shared.Array_Elements.Table (Element_Id);

                  if Element.Index /= All_Other_Names then

                     --  Get the name of the language

                     Lang_Index := Get_Language_From_Name
                       (Project, Get_Name_String (Element.Index));

                     if Lang_Index /= No_Language_Index then
                        case Current_Array.Name is

                        --  Attribute Dependency_Kind (<language>)

                        when Name_Dependency_Kind =>
                           Get_Name_String (Element.Value.Value);

                           begin
                              Lang_Index.Config.Dependency_Kind :=
                                Dependency_File_Kind'Value
                                  (Name_Buffer (1 .. Name_Len));

                           exception
                              when Constraint_Error =>
                                 Error_Msg
                                   (Data.Flags,
                                    "illegal value for Dependency_Kind",
                                    Element.Value.Location,
                                    Project);
                           end;

                        --  Attribute Dependency_Switches (<language>)

                        when Name_Dependency_Switches =>
                           if Lang_Index.Config.Dependency_Kind = None then
                              Lang_Index.Config.Dependency_Kind := Makefile;
                           end if;

                           List := Element.Value.Values;

                           if List /= Nil_String then
                              Put (Into_List =>
                                     Lang_Index.Config.Dependency_Option,
                                   From_List => List,
                                   In_Tree   => Data.Tree);
                           end if;

                        --  Attribute Dependency_Driver (<language>)

                        when Name_Dependency_Driver =>
                           if Lang_Index.Config.Dependency_Kind = None then
                              Lang_Index.Config.Dependency_Kind := Makefile;
                           end if;

                           List := Element.Value.Values;

                           if List /= Nil_String then
                              Put (Into_List =>
                                     Lang_Index.Config.Compute_Dependency,
                                   From_List => List,
                                   In_Tree   => Data.Tree);
                           end if;

                        --  Attribute Language_Kind (<language>)

                        when Name_Language_Kind =>
                           Get_Name_String (Element.Value.Value);

                           begin
                              Lang_Index.Config.Kind :=
                                Language_Kind'Value
                                  (Name_Buffer (1 .. Name_Len));

                           exception
                              when Constraint_Error =>
                                 Error_Msg
                                   (Data.Flags,
                                    "illegal value for Language_Kind",
                                    Element.Value.Location,
                                    Project);
                           end;

                        --  Attribute Include_Switches (<language>)

                        when Name_Include_Switches =>
                           List := Element.Value.Values;

                           if List = Nil_String then
                              Error_Msg
                                (Data.Flags, "include option cannot be null",
                                 Element.Value.Location, Project);
                           end if;

                           Put (Into_List => Lang_Index.Config.Include_Option,
                                From_List => List,
                                In_Tree   => Data.Tree);

                        --  Attribute Include_Path (<language>)

                        when Name_Include_Path =>
                           Lang_Index.Config.Include_Path :=
                             Element.Value.Value;

                        --  Attribute Include_Path_File (<language>)

                        when Name_Include_Path_File =>
                           Lang_Index.Config.Include_Path_File :=
                             Element.Value.Value;

                        --  Attribute Driver (<language>)

                        when Name_Driver =>
                           Lang_Index.Config.Compiler_Driver :=
                             File_Name_Type (Element.Value.Value);

                        when Name_Required_Switches
                           | Name_Leading_Required_Switches
                           =>
                           Put (Into_List =>
                                  Lang_Index.Config.
                                    Compiler_Leading_Required_Switches,
                                From_List => Element.Value.Values,
                                In_Tree   => Data.Tree);

                        when Name_Trailing_Required_Switches =>
                           Put (Into_List =>
                                  Lang_Index.Config.
                                    Compiler_Trailing_Required_Switches,
                                From_List => Element.Value.Values,
                                In_Tree   => Data.Tree);

                        when Name_Multi_Unit_Switches =>
                           Put (Into_List =>
                                  Lang_Index.Config.Multi_Unit_Switches,
                                From_List => Element.Value.Values,
                                In_Tree   => Data.Tree);

                        when Name_Multi_Unit_Object_Separator =>
                           Get_Name_String (Element.Value.Value);

                           if Name_Len /= 1 then
                              Error_Msg
                                (Data.Flags,
                                 "multi-unit object separator must have " &
                                 "a single character",
                                 Element.Value.Location, Project);

                           elsif Name_Buffer (1) = ' ' then
                              Error_Msg
                                (Data.Flags,
                                 "multi-unit object separator cannot be " &
                                 "a space",
                                 Element.Value.Location, Project);

                           else
                              Lang_Index.Config.Multi_Unit_Object_Separator :=
                                Name_Buffer (1);
                           end if;

                        when Name_Path_Syntax =>
                           begin
                              Lang_Index.Config.Path_Syntax :=
                                  Path_Syntax_Kind'Value
                                    (Get_Name_String (Element.Value.Value));

                           exception
                              when Constraint_Error =>
                                 Error_Msg
                                   (Data.Flags,
                                    "invalid value for Path_Syntax",
                                    Element.Value.Location, Project);
                           end;

                        when Name_Source_File_Switches =>
                           Put (Into_List =>
                                  Lang_Index.Config.Source_File_Switches,
                                From_List => Element.Value.Values,
                                In_Tree   => Data.Tree);

                        when Name_Object_File_Suffix =>
                           if Get_Name_String (Element.Value.Value) = "" then
                              Error_Msg
                                (Data.Flags,
                                 "object file suffix cannot be empty",
                                 Element.Value.Location, Project);

                           else
                              Lang_Index.Config.Object_File_Suffix :=
                                Element.Value.Value;
                           end if;

                        when Name_Object_File_Switches =>
                           Put (Into_List =>
                                  Lang_Index.Config.Object_File_Switches,
                                From_List => Element.Value.Values,
                                In_Tree   => Data.Tree);

                        when Name_Object_Path_Switches =>
                           Put (Into_List =>
                                  Lang_Index.Config.Object_Path_Switches,
                                From_List => Element.Value.Values,
                                In_Tree   => Data.Tree);

                        --  Attribute Compiler_Pic_Option (<language>)

                        when Name_Pic_Option =>
                           List := Element.Value.Values;

                           if List = Nil_String then
                              Error_Msg
                                (Data.Flags,
                                 "compiler PIC option cannot be null",
                                 Element.Value.Location, Project);
                           end if;

                           Put (Into_List =>
                                  Lang_Index.Config.Compilation_PIC_Option,
                                From_List => List,
                                In_Tree   => Data.Tree);

                        --  Attribute Mapping_File_Switches (<language>)

                        when Name_Mapping_File_Switches =>
                           List := Element.Value.Values;

                           if List = Nil_String then
                              Error_Msg
                                (Data.Flags,
                                 "mapping file switches cannot be null",
                                 Element.Value.Location, Project);
                           end if;

                           Put (Into_List =>
                                Lang_Index.Config.Mapping_File_Switches,
                                From_List => List,
                                In_Tree   => Data.Tree);

                        --  Attribute Mapping_Spec_Suffix (<language>)

                        when Name_Mapping_Spec_Suffix =>
                           Lang_Index.Config.Mapping_Spec_Suffix :=
                             File_Name_Type (Element.Value.Value);

                        --  Attribute Mapping_Body_Suffix (<language>)

                        when Name_Mapping_Body_Suffix =>
                           Lang_Index.Config.Mapping_Body_Suffix :=
                             File_Name_Type (Element.Value.Value);

                        --  Attribute Config_File_Switches (<language>)

                        when Name_Config_File_Switches =>
                           List := Element.Value.Values;

                           if List = Nil_String then
                              Error_Msg
                                (Data.Flags,
                                 "config file switches cannot be null",
                                 Element.Value.Location, Project);
                           end if;

                           Put (Into_List =>
                                  Lang_Index.Config.Config_File_Switches,
                                From_List => List,
                                In_Tree   => Data.Tree);

                        --  Attribute Objects_Path (<language>)

                        when Name_Objects_Path =>
                           Lang_Index.Config.Objects_Path :=
                             Element.Value.Value;

                        --  Attribute Objects_Path_File (<language>)

                        when Name_Objects_Path_File =>
                           Lang_Index.Config.Objects_Path_File :=
                             Element.Value.Value;

                        --  Attribute Config_Body_File_Name (<language>)

                        when Name_Config_Body_File_Name =>
                           Lang_Index.Config.Config_Body :=
                             Element.Value.Value;

                        --  Attribute Config_Body_File_Name_Index (< Language>)

                        when Name_Config_Body_File_Name_Index =>
                           Lang_Index.Config.Config_Body_Index :=
                             Element.Value.Value;

                        --  Attribute Config_Body_File_Name_Pattern(<language>)

                        when Name_Config_Body_File_Name_Pattern =>
                           Lang_Index.Config.Config_Body_Pattern :=
                             Element.Value.Value;

                           --  Attribute Config_Spec_File_Name (<language>)

                        when Name_Config_Spec_File_Name =>
                           Lang_Index.Config.Config_Spec :=
                             Element.Value.Value;

                        --  Attribute Config_Spec_File_Name_Index (<language>)

                        when Name_Config_Spec_File_Name_Index =>
                           Lang_Index.Config.Config_Spec_Index :=
                             Element.Value.Value;

                        --  Attribute Config_Spec_File_Name_Pattern(<language>)

                        when Name_Config_Spec_File_Name_Pattern =>
                           Lang_Index.Config.Config_Spec_Pattern :=
                             Element.Value.Value;

                        --  Attribute Config_File_Unique (<language>)

                        when Name_Config_File_Unique =>
                           begin
                              Lang_Index.Config.Config_File_Unique :=
                                Boolean'Value
                                  (Get_Name_String (Element.Value.Value));
                           exception
                              when Constraint_Error =>
                                 Error_Msg
                                   (Data.Flags,
                                    "illegal value for Config_File_Unique",
                                    Element.Value.Location, Project);
                           end;

                        when others =>
                           null;
                        end case;
                     end if;
                  end if;

                  Element_Id := Element.Next;
               end loop;

               Current_Array_Id := Current_Array.Next;
            end loop;
         end Process_Compiler;

         --------------------
         -- Process_Naming --
         --------------------

         procedure Process_Naming (Attributes : Variable_Id) is
            Attribute_Id : Variable_Id;
            Attribute    : Variable;

         begin
            --  Process non associated array attribute from package Naming

            Attribute_Id := Attributes;
            while Attribute_Id /= No_Variable loop
               Attribute := Shared.Variable_Elements.Table (Attribute_Id);

               if not Attribute.Value.Default then
                  if Attribute.Name = Name_Separate_Suffix then

                     --  Attribute Separate_Suffix

                     Get_Name_String (Attribute.Value.Value);
                     Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
                     Separate_Suffix := Name_Find;

                  elsif Attribute.Name = Name_Casing then

                     --  Attribute Casing

                     begin
                        Casing :=
                          Value (Get_Name_String (Attribute.Value.Value));

                     exception
                        when Constraint_Error =>
                           Error_Msg
                             (Data.Flags,
                              "invalid value for Casing",
                              Attribute.Value.Location, Project);
                     end;

                  elsif Attribute.Name = Name_Dot_Replacement then

                     --  Attribute Dot_Replacement

                     Dot_Replacement := File_Name_Type (Attribute.Value.Value);

                  end if;
               end if;

               Attribute_Id := Attribute.Next;
            end loop;
         end Process_Naming;

         procedure Process_Naming (Arrays : Array_Id) is
            Current_Array_Id : Array_Id;
            Current_Array    : Array_Data;
            Element_Id       : Array_Element_Id;
            Element          : Array_Element;

         begin
            --  Process the associative array attribute of package Naming

            Current_Array_Id := Arrays;
            while Current_Array_Id /= No_Array loop
               Current_Array := Shared.Arrays.Table (Current_Array_Id);

               Element_Id := Current_Array.Value;
               while Element_Id /= No_Array_Element loop
                  Element := Shared.Array_Elements.Table (Element_Id);

                  --  Get the name of the language

                  Lang_Index := Get_Language_From_Name
                    (Project, Get_Name_String (Element.Index));

                  if Lang_Index /= No_Language_Index then
                     case Current_Array.Name is
                        when Name_Spec_Suffix | Name_Specification_Suffix =>

                           --  Attribute Spec_Suffix (<language>)

                           Get_Name_String (Element.Value.Value);
                           Canonical_Case_File_Name
                             (Name_Buffer (1 .. Name_Len));
                           Lang_Index.Config.Naming_Data.Spec_Suffix :=
                             Name_Find;

                        when Name_Implementation_Suffix | Name_Body_Suffix =>

                           Get_Name_String (Element.Value.Value);
                           Canonical_Case_File_Name
                             (Name_Buffer (1 .. Name_Len));

                           --  Attribute Body_Suffix (<language>)

                           Lang_Index.Config.Naming_Data.Body_Suffix :=
                             Name_Find;
                           Lang_Index.Config.Naming_Data.Separate_Suffix :=
                             Lang_Index.Config.Naming_Data.Body_Suffix;

                        when others =>
                           null;
                     end case;
                  end if;

                  Element_Id := Element.Next;
               end loop;

               Current_Array_Id := Current_Array.Next;
            end loop;
         end Process_Naming;

         --------------------
         -- Process_Linker --
         --------------------

         procedure Process_Linker (Attributes : Variable_Id) is
            Attribute_Id : Variable_Id;
            Attribute    : Variable;

         begin
            --  Process non associated array attribute from package Linker

            Attribute_Id := Attributes;
            while Attribute_Id /= No_Variable loop
               Attribute := Shared.Variable_Elements.Table (Attribute_Id);

               if not Attribute.Value.Default then
                  if Attribute.Name = Name_Driver then

                     --  Attribute Linker'Driver: the default linker to use

                     Project.Config.Linker :=
                       Path_Name_Type (Attribute.Value.Value);

                     --  Linker'Driver is also used to link shared libraries
                     --  if the obsolescent attribute Library_GCC has not been
                     --  specified.

                     if Project.Config.Shared_Lib_Driver = No_File then
                        Project.Config.Shared_Lib_Driver :=
                          File_Name_Type (Attribute.Value.Value);
                     end if;

                  elsif Attribute.Name = Name_Required_Switches then

                     --  Attribute Required_Switches: the minimum trailing
                     --  options to use when invoking the linker

                     Put (Into_List =>
                            Project.Config.Trailing_Linker_Required_Switches,
                          From_List => Attribute.Value.Values,
                          In_Tree   => Data.Tree);

                  elsif Attribute.Name = Name_Map_File_Option then
                     Project.Config.Map_File_Option := Attribute.Value.Value;

                  elsif Attribute.Name = Name_Max_Command_Line_Length then
                     begin
                        Project.Config.Max_Command_Line_Length :=
                          Natural'Value (Get_Name_String
                                         (Attribute.Value.Value));

                     exception
                        when Constraint_Error =>
                           Error_Msg
                             (Data.Flags,
                              "value must be positive or equal to 0",
                              Attribute.Value.Location, Project);
                     end;

                  elsif Attribute.Name = Name_Response_File_Format then
                     declare
                        Name  : Name_Id;

                     begin
                        Get_Name_String (Attribute.Value.Value);
                        To_Lower (Name_Buffer (1 .. Name_Len));
                        Name := Name_Find;

                        if Name = Name_None then
                           Project.Config.Resp_File_Format := None;

                        elsif Name = Name_Gnu then
                           Project.Config.Resp_File_Format := GNU;

                        elsif Name = Name_Object_List then
                           Project.Config.Resp_File_Format := Object_List;

                        elsif Name = Name_Option_List then
                           Project.Config.Resp_File_Format := Option_List;

                        elsif Name_Buffer (1 .. Name_Len) = "gcc" then
                           Project.Config.Resp_File_Format := GCC;

                        elsif Name_Buffer (1 .. Name_Len) = "gcc_gnu" then
                           Project.Config.Resp_File_Format := GCC_GNU;

                        elsif
                          Name_Buffer (1 .. Name_Len) = "gcc_option_list"
                        then
                           Project.Config.Resp_File_Format := GCC_Option_List;

                        elsif
                          Name_Buffer (1 .. Name_Len) = "gcc_object_list"
                        then
                           Project.Config.Resp_File_Format := GCC_Object_List;

                        else
                           Error_Msg
                             (Data.Flags,
                              "illegal response file format",
                              Attribute.Value.Location, Project);
                        end if;
                     end;

                  elsif Attribute.Name = Name_Response_File_Switches then
                     Put (Into_List => Project.Config.Resp_File_Options,
                          From_List => Attribute.Value.Values,
                          In_Tree   => Data.Tree);
                  end if;
               end if;

               Attribute_Id := Attribute.Next;
            end loop;
         end Process_Linker;

      --  Start of processing for Process_Packages

      begin
         Packages := Project.Decl.Packages;
         while Packages /= No_Package loop
            Element := Shared.Packages.Table (Packages);

            case Element.Name is
               when Name_Binder =>

                  --  Process attributes of package Binder

                  Process_Binder (Element.Decl.Arrays);

               when Name_Builder =>

                  --  Process attributes of package Builder

                  Process_Builder (Element.Decl.Attributes);

               when Name_Clean =>

                  --  Process attributes of package Clean

                  Process_Clean (Element.Decl.Attributes);
                  Process_Clean (Element.Decl.Arrays);

               when Name_Compiler =>

                  --  Process attributes of package Compiler

                  Process_Compiler (Element.Decl.Arrays);

               when Name_Linker =>

                  --  Process attributes of package Linker

                  Process_Linker (Element.Decl.Attributes);

               when Name_Naming =>

                  --  Process attributes of package Naming

                  Process_Naming (Element.Decl.Attributes);
                  Process_Naming (Element.Decl.Arrays);

               when others =>
                  null;
            end case;

            Packages := Element.Next;
         end loop;
      end Process_Packages;

      ---------------------------------------------
      -- Process_Project_Level_Simple_Attributes --
      ---------------------------------------------

      procedure Process_Project_Level_Simple_Attributes is
         Attribute_Id : Variable_Id;
         Attribute    : Variable;
         List         : String_List_Id;

      begin
         --  Process non associated array attribute at project level

         Attribute_Id := Project.Decl.Attributes;
         while Attribute_Id /= No_Variable loop
            Attribute := Shared.Variable_Elements.Table (Attribute_Id);

            if not Attribute.Value.Default then
               if Attribute.Name = Name_Target then

                  --  Attribute Target: the target specified

                  Project.Config.Target := Attribute.Value.Value;

               elsif Attribute.Name = Name_Library_Builder then

                  --  Attribute Library_Builder: the application to invoke
                  --  to build libraries.

                  Project.Config.Library_Builder :=
                    Path_Name_Type (Attribute.Value.Value);

               elsif Attribute.Name = Name_Archive_Builder then

                  --  Attribute Archive_Builder: the archive builder
                  --  (usually "ar") and its minimum options (usually "cr").

                  List := Attribute.Value.Values;

                  if List = Nil_String then
                     Error_Msg
                       (Data.Flags,
                        "archive builder cannot be null",
                        Attribute.Value.Location, Project);
                  end if;

                  Put (Into_List => Project.Config.Archive_Builder,
                       From_List => List,
                       In_Tree   => Data.Tree);

               elsif Attribute.Name = Name_Archive_Builder_Append_Option then

                  --  Attribute Archive_Builder: the archive builder
                  --  (usually "ar") and its minimum options (usually "cr").

                  List := Attribute.Value.Values;

                  if List /= Nil_String then
                     Put
                       (Into_List =>
                          Project.Config.Archive_Builder_Append_Option,
                        From_List => List,
                        In_Tree   => Data.Tree);
                  end if;

               elsif Attribute.Name = Name_Archive_Indexer then

                  --  Attribute Archive_Indexer: the optional archive
                  --  indexer (usually "ranlib") with its minimum options
                  --  (usually none).

                  List := Attribute.Value.Values;

                  if List = Nil_String then
                     Error_Msg
                       (Data.Flags,
                        "archive indexer cannot be null",
                        Attribute.Value.Location, Project);
                  end if;

                  Put (Into_List => Project.Config.Archive_Indexer,
                       From_List => List,
                       In_Tree   => Data.Tree);

               elsif Attribute.Name = Name_Library_Partial_Linker then

                  --  Attribute Library_Partial_Linker: the optional linker
                  --  driver with its minimum options, to partially link
                  --  archives.

                  List := Attribute.Value.Values;

                  if List = Nil_String then
                     Error_Msg
                       (Data.Flags,
                        "partial linker cannot be null",
                        Attribute.Value.Location, Project);
                  end if;

                  Put (Into_List => Project.Config.Lib_Partial_Linker,
                       From_List => List,
                       In_Tree   => Data.Tree);

               elsif Attribute.Name = Name_Library_GCC then
                  Project.Config.Shared_Lib_Driver :=
                    File_Name_Type (Attribute.Value.Value);
                  Error_Msg
                    (Data.Flags,
                     "?Library_'G'C'C is an obsolescent attribute, " &
                     "use Linker''Driver instead",
                     Attribute.Value.Location, Project);

               elsif Attribute.Name = Name_Archive_Suffix then
                  Project.Config.Archive_Suffix :=
                    File_Name_Type (Attribute.Value.Value);

               elsif Attribute.Name = Name_Linker_Executable_Option then

                  --  Attribute Linker_Executable_Option: optional options
                  --  to specify an executable name. Defaults to "-o".

                  List := Attribute.Value.Values;

                  if List = Nil_String then
                     Error_Msg
                       (Data.Flags,
                        "linker executable option cannot be null",
                        Attribute.Value.Location, Project);
                  end if;

                  Put (Into_List => Project.Config.Linker_Executable_Option,
                       From_List => List,
                       In_Tree   => Data.Tree);

               elsif Attribute.Name = Name_Linker_Lib_Dir_Option then

                  --  Attribute Linker_Lib_Dir_Option: optional options
                  --  to specify a library search directory. Defaults to
                  --  "-L".

                  Get_Name_String (Attribute.Value.Value);

                  if Name_Len = 0 then
                     Error_Msg
                       (Data.Flags,
                        "linker library directory option cannot be empty",
                        Attribute.Value.Location, Project);
                  end if;

                  Project.Config.Linker_Lib_Dir_Option :=
                    Attribute.Value.Value;

               elsif Attribute.Name = Name_Linker_Lib_Name_Option then

                  --  Attribute Linker_Lib_Name_Option: optional options
                  --  to specify the name of a library to be linked in.
                  --  Defaults to "-l".

                  Get_Name_String (Attribute.Value.Value);

                  if Name_Len = 0 then
                     Error_Msg
                       (Data.Flags,
                        "linker library name option cannot be empty",
                        Attribute.Value.Location, Project);
                  end if;

                  Project.Config.Linker_Lib_Name_Option :=
                    Attribute.Value.Value;

               elsif Attribute.Name = Name_Run_Path_Option then

                  --  Attribute Run_Path_Option: optional options to
                  --  specify a path for libraries.

                  List := Attribute.Value.Values;

                  if List /= Nil_String then
                     Put (Into_List => Project.Config.Run_Path_Option,
                          From_List => List,
                          In_Tree   => Data.Tree);
                  end if;

               elsif Attribute.Name = Name_Run_Path_Origin then
                  Get_Name_String (Attribute.Value.Value);

                  if Name_Len = 0 then
                     Error_Msg
                       (Data.Flags,
                        "run path origin cannot be empty",
                        Attribute.Value.Location, Project);
                  end if;

                  Project.Config.Run_Path_Origin := Attribute.Value.Value;

               elsif Attribute.Name = Name_Library_Install_Name_Option then
                  Project.Config.Library_Install_Name_Option :=
                    Attribute.Value.Value;

               elsif Attribute.Name = Name_Separate_Run_Path_Options then
                  declare
                     pragma Unsuppress (All_Checks);
                  begin
                     Project.Config.Separate_Run_Path_Options :=
                       Boolean'Value (Get_Name_String (Attribute.Value.Value));
                  exception
                     when Constraint_Error =>
                        Error_Msg
                          (Data.Flags,
                           "invalid value """ &
                           Get_Name_String (Attribute.Value.Value) &
                           """ for Separate_Run_Path_Options",
                           Attribute.Value.Location, Project);
                  end;

               elsif Attribute.Name = Name_Library_Support then
                  declare
                     pragma Unsuppress (All_Checks);
                  begin
                     Project.Config.Lib_Support :=
                       Library_Support'Value (Get_Name_String
                                              (Attribute.Value.Value));
                  exception
                     when Constraint_Error =>
                        Error_Msg
                          (Data.Flags,
                           "invalid value """ &
                           Get_Name_String (Attribute.Value.Value) &
                           """ for Library_Support",
                           Attribute.Value.Location, Project);
                  end;

               elsif
                 Attribute.Name = Name_Library_Encapsulated_Supported
               then
                  declare
                     pragma Unsuppress (All_Checks);
                  begin
                     Project.Config.Lib_Encapsulated_Supported :=
                       Boolean'Value (Get_Name_String (Attribute.Value.Value));
                  exception
                     when Constraint_Error =>
                        Error_Msg
                          (Data.Flags,
                           "invalid value """
                             & Get_Name_String (Attribute.Value.Value)
                             & """ for Library_Encapsulated_Supported",
                           Attribute.Value.Location, Project);
                  end;

               elsif Attribute.Name = Name_Shared_Library_Prefix then
                  Project.Config.Shared_Lib_Prefix :=
                    File_Name_Type (Attribute.Value.Value);

               elsif Attribute.Name = Name_Shared_Library_Suffix then
                  Project.Config.Shared_Lib_Suffix :=
                    File_Name_Type (Attribute.Value.Value);

               elsif Attribute.Name = Name_Symbolic_Link_Supported then
                  declare
                     pragma Unsuppress (All_Checks);
                  begin
                     Project.Config.Symbolic_Link_Supported :=
                       Boolean'Value (Get_Name_String
                                      (Attribute.Value.Value));
                  exception
                     when Constraint_Error =>
                        Error_Msg
                          (Data.Flags,
                           "invalid value """
                             & Get_Name_String (Attribute.Value.Value)
                             & """ for Symbolic_Link_Supported",
                           Attribute.Value.Location, Project);
                  end;

               elsif
                 Attribute.Name = Name_Library_Major_Minor_Id_Supported
               then
                  declare
                     pragma Unsuppress (All_Checks);
                  begin
                     Project.Config.Lib_Maj_Min_Id_Supported :=
                       Boolean'Value (Get_Name_String
                                      (Attribute.Value.Value));
                  exception
                     when Constraint_Error =>
                        Error_Msg
                          (Data.Flags,
                           "invalid value """ &
                           Get_Name_String (Attribute.Value.Value) &
                           """ for Library_Major_Minor_Id_Supported",
                           Attribute.Value.Location, Project);
                  end;

               elsif Attribute.Name = Name_Library_Auto_Init_Supported then
                  declare
                     pragma Unsuppress (All_Checks);
                  begin
                     Project.Config.Auto_Init_Supported :=
                       Boolean'Value (Get_Name_String (Attribute.Value.Value));
                  exception
                     when Constraint_Error =>
                        Error_Msg
                          (Data.Flags,
                           "invalid value """
                             & Get_Name_String (Attribute.Value.Value)
                             & """ for Library_Auto_Init_Supported",
                           Attribute.Value.Location, Project);
                  end;

               elsif Attribute.Name = Name_Shared_Library_Minimum_Switches then
                  List := Attribute.Value.Values;

                  if List /= Nil_String then
                     Put (Into_List => Project.Config.Shared_Lib_Min_Options,
                          From_List => List,
                          In_Tree   => Data.Tree);
                  end if;

               elsif Attribute.Name = Name_Library_Version_Switches then
                  List := Attribute.Value.Values;

                  if List /= Nil_String then
                     Put (Into_List => Project.Config.Lib_Version_Options,
                          From_List => List,
                          In_Tree   => Data.Tree);
                  end if;
               end if;
            end if;

            Attribute_Id := Attribute.Next;
         end loop;
      end Process_Project_Level_Simple_Attributes;

      --------------------------------------------
      -- Process_Project_Level_Array_Attributes --
      --------------------------------------------

      procedure Process_Project_Level_Array_Attributes is
         Current_Array_Id : Array_Id;
         Current_Array    : Array_Data;
         Element_Id       : Array_Element_Id;
         Element          : Array_Element;
         List             : String_List_Id;

      begin
         --  Process the associative array attributes at project level

         Current_Array_Id := Project.Decl.Arrays;
         while Current_Array_Id /= No_Array loop
            Current_Array := Shared.Arrays.Table (Current_Array_Id);

            Element_Id := Current_Array.Value;
            while Element_Id /= No_Array_Element loop
               Element := Shared.Array_Elements.Table (Element_Id);

               --  Get the name of the language

               Lang_Index :=
                 Get_Language_From_Name
                   (Project, Get_Name_String (Element.Index));

               if Lang_Index /= No_Language_Index then
                  case Current_Array.Name is
                     when Name_Inherit_Source_Path =>
                        List := Element.Value.Values;

                        if List /= Nil_String then
                           Put
                             (Into_List  =>
                                Lang_Index.Config.Include_Compatible_Languages,
                              From_List  => List,
                              In_Tree    => Data.Tree,
                              Lower_Case => True);
                        end if;

                     when Name_Toolchain_Description =>

                        --  Attribute Toolchain_Description (<language>)

                        Lang_Index.Config.Toolchain_Description :=
                          Element.Value.Value;

                     when Name_Toolchain_Version =>

                        --  Attribute Toolchain_Version (<language>)

                        Lang_Index.Config.Toolchain_Version :=
                          Element.Value.Value;

                        --  For Ada, set proper checksum computation mode

                        if Lang_Index.Name = Name_Ada then
                           declare
                              Vers : constant String :=
                                       Get_Name_String (Element.Value.Value);
                              pragma Assert (Vers'First = 1);

                           begin
                              --  Version 6.3 or earlier

                              if Vers'Length >= 8
                                and then Vers (1 .. 5) = "GNAT "
                                and then Vers (7) = '.'
                                and then
                                  (Vers (6) < '6'
                                    or else
                                      (Vers (6) = '6' and then Vers (8) < '4'))
                              then
                                 Checksum_GNAT_6_3 := True;

                                 --  Version 5.03 or earlier

                                 if Vers (6) < '5'
                                   or else (Vers (6) = '5'
                                             and then Vers (Vers'Last) < '4')
                                 then
                                    Checksum_GNAT_5_03 := True;

                                    --  Version 5.02 or earlier

                                    if Vers (6) /= '5'
                                      or else Vers (Vers'Last) < '3'
                                    then
                                       Checksum_Accumulate_Token_Checksum :=
                                         False;
                                    end if;
                                 end if;
                              end if;
                           end;
                        end if;

                     when Name_Runtime_Library_Dir =>

                        --  Attribute Runtime_Library_Dir (<language>)

                        Lang_Index.Config.Runtime_Library_Dir :=
                          Element.Value.Value;

                     when Name_Runtime_Source_Dir =>

                        --  Attribute Runtime_Source_Dir (<language>)

                        Lang_Index.Config.Runtime_Source_Dir :=
                          Element.Value.Value;

                     when Name_Object_Generated =>
                        declare
                           pragma Unsuppress (All_Checks);
                           Value : Boolean;

                        begin
                           Value :=
                             Boolean'Value
                               (Get_Name_String (Element.Value.Value));

                           Lang_Index.Config.Object_Generated := Value;

                           --  If no object is generated, no object may be
                           --  linked.

                           if not Value then
                              Lang_Index.Config.Objects_Linked := False;
                           end if;

                        exception
                           when Constraint_Error =>
                              Error_Msg
                                (Data.Flags,
                                 "invalid value """
                                 & Get_Name_String (Element.Value.Value)
                                 & """ for Object_Generated",
                                 Element.Value.Location, Project);
                        end;

                     when Name_Objects_Linked =>
                        declare
                           pragma Unsuppress (All_Checks);
                           Value : Boolean;

                        begin
                           Value :=
                             Boolean'Value
                               (Get_Name_String (Element.Value.Value));

                           --  No change if Object_Generated is False, as this
                           --  forces Objects_Linked to be False too.

                           if Lang_Index.Config.Object_Generated then
                              Lang_Index.Config.Objects_Linked := Value;
                           end if;

                        exception
                           when Constraint_Error =>
                              Error_Msg
                                (Data.Flags,
                                 "invalid value """
                                 & Get_Name_String (Element.Value.Value)
                                 & """ for Objects_Linked",
                                 Element.Value.Location, Project);
                        end;
                     when others =>
                        null;
                  end case;
               end if;

               Element_Id := Element.Next;
            end loop;

            Current_Array_Id := Current_Array.Next;
         end loop;
      end Process_Project_Level_Array_Attributes;

   --  Start of processing for Check_Configuration

   begin
      Process_Project_Level_Simple_Attributes;
      Process_Project_Level_Array_Attributes;
      Process_Packages;

      --  For unit based languages, set Casing, Dot_Replacement and
      --  Separate_Suffix in Naming_Data.

      Lang_Index := Project.Languages;
      while Lang_Index /= No_Language_Index loop
         if Lang_Index.Config.Kind = Unit_Based then
            Lang_Index.Config.Naming_Data.Casing := Casing;
            Lang_Index.Config.Naming_Data.Dot_Replacement := Dot_Replacement;

            if Separate_Suffix /= No_File then
               Lang_Index.Config.Naming_Data.Separate_Suffix :=
                 Separate_Suffix;
            end if;

            exit;
         end if;

         Lang_Index := Lang_Index.Next;
      end loop;

      --  Give empty names to various prefixes/suffixes, if they have not
      --  been specified in the configuration.

      if Project.Config.Archive_Suffix = No_File then
         Project.Config.Archive_Suffix := Empty_File;
      end if;

      if Project.Config.Shared_Lib_Prefix = No_File then
         Project.Config.Shared_Lib_Prefix := Empty_File;
      end if;

      if Project.Config.Shared_Lib_Suffix = No_File then
         Project.Config.Shared_Lib_Suffix := Empty_File;
      end if;

      Lang_Index := Project.Languages;
      while Lang_Index /= No_Language_Index loop

         --  For all languages, Compiler_Driver needs to be specified. This is
         --  only needed if we do intend to compile (not in GPS for instance).

         if Data.Flags.Compiler_Driver_Mandatory
           and then Lang_Index.Config.Compiler_Driver = No_File
         then
            Error_Msg_Name_1 := Lang_Index.Display_Name;
            Error_Msg
              (Data.Flags,
               "?no compiler specified for language %%" &
                 ", ignoring all its sources",
               No_Location, Project);

            if Lang_Index = Project.Languages then
               Project.Languages := Lang_Index.Next;
            else
               Prev_Index.Next := Lang_Index.Next;
            end if;

         elsif Lang_Index.Config.Kind = Unit_Based then
            Prev_Index := Lang_Index;

            --  For unit based languages, Dot_Replacement, Spec_Suffix and
            --  Body_Suffix need to be specified.

            if Lang_Index.Config.Naming_Data.Dot_Replacement = No_File then
               Error_Msg
                 (Data.Flags,
                  "Dot_Replacement not specified for " &
                  Get_Name_String (Lang_Index.Name),
                  No_Location, Project);
            end if;

            if Lang_Index.Config.Naming_Data.Spec_Suffix = No_File then
               Error_Msg
                 (Data.Flags,
                  "Spec_Suffix not specified for " &
                  Get_Name_String (Lang_Index.Name),
                  No_Location, Project);
            end if;

            if Lang_Index.Config.Naming_Data.Body_Suffix = No_File then
               Error_Msg
                 (Data.Flags,
                  "Body_Suffix not specified for " &
                  Get_Name_String (Lang_Index.Name),
                  No_Location, Project);
            end if;

         else
            Prev_Index := Lang_Index;

            --  For file based languages, either Spec_Suffix or Body_Suffix
            --  need to be specified.

            if Data.Flags.Require_Sources_Other_Lang
              and then Lang_Index.Config.Naming_Data.Spec_Suffix = No_File
              and then Lang_Index.Config.Naming_Data.Body_Suffix = No_File
            then
               Error_Msg_Name_1 := Lang_Index.Display_Name;
               Error_Msg
                 (Data.Flags,
                  "no suffixes specified for %%",
                  No_Location, Project);
            end if;
         end if;

         Lang_Index := Lang_Index.Next;
      end loop;
   end Check_Configuration;

   -------------------------------
   -- Check_If_Externally_Built --
   -------------------------------

   procedure Check_If_Externally_Built
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared   : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;
      Externally_Built : constant Variable_Value :=
                           Util.Value_Of
                            (Name_Externally_Built,
                             Project.Decl.Attributes, Shared);

   begin
      if not Externally_Built.Default then
         Get_Name_String (Externally_Built.Value);
         To_Lower (Name_Buffer (1 .. Name_Len));

         if Name_Buffer (1 .. Name_Len) = "true" then
            Project.Externally_Built := True;

         elsif Name_Buffer (1 .. Name_Len) /= "false" then
            Error_Msg (Data.Flags,
                       "Externally_Built may only be true or false",
                       Externally_Built.Location, Project);
         end if;
      end if;

      --  A virtual project extending an externally built project is itself
      --  externally built.

      if Project.Virtual and then Project.Extends /= No_Project then
         Project.Externally_Built := Project.Extends.Externally_Built;
      end if;

      if Project.Externally_Built then
         Debug_Output ("project is externally built");
      else
         Debug_Output ("project is not externally built");
      end if;
   end Check_If_Externally_Built;

   ----------------------
   -- Check_Interfaces --
   ----------------------

   procedure Check_Interfaces
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Interfaces : constant Prj.Variable_Value :=
                     Prj.Util.Value_Of
                       (Snames.Name_Interfaces,
                        Project.Decl.Attributes,
                        Shared);

      Library_Interface : constant Prj.Variable_Value :=
                            Prj.Util.Value_Of
                              (Snames.Name_Library_Interface,
                               Project.Decl.Attributes,
                               Shared);

      List       : String_List_Id;
      Element    : String_Element;
      Name       : File_Name_Type;
      Iter       : Source_Iterator;
      Source     : Source_Id;
      Project_2  : Project_Id;
      Other      : Source_Id;
      Unit_Found : Boolean;

      Interface_ALIs   : String_List_Id := Nil_String;
      Other_Interfaces : String_List_Id := Nil_String;

   begin
      if not Interfaces.Default then

         --  Set In_Interfaces to False for all sources. It will be set to True
         --  later for the sources in the Interfaces list.

         Project_2 := Project;
         while Project_2 /= No_Project loop
            Iter := For_Each_Source (Data.Tree, Project_2);
            loop
               Source := Prj.Element (Iter);
               exit when Source = No_Source;
               Source.In_Interfaces := False;
               Next (Iter);
            end loop;

            Project_2 := Project_2.Extends;
         end loop;

         List := Interfaces.Values;
         while List /= Nil_String loop
            Element := Shared.String_Elements.Table (List);
            Name := Canonical_Case_File_Name (Element.Value);

            Project_2 := Project;
            Big_Loop : while Project_2 /= No_Project loop
               if Project.Qualifier = Aggregate_Library then

                  --  For an aggregate library we want to consider sources of
                  --  all aggregated projects.

                  Iter := For_Each_Source (Data.Tree);

               else
                  Iter := For_Each_Source (Data.Tree, Project_2);
               end if;

               loop
                  Source := Prj.Element (Iter);
                  exit when Source = No_Source;

                  if Source.File = Name then
                     if not Source.Locally_Removed then
                        Source.In_Interfaces := True;
                        Source.Declared_In_Interfaces := True;

                        Other := Other_Part (Source);

                        if Other /= No_Source then
                           Other.In_Interfaces := True;
                           Other.Declared_In_Interfaces := True;
                        end if;

                        --  Unit based case

                        if Source.Language.Config.Kind = Unit_Based then
                           if Source.Kind = Spec
                             and then Other_Part (Source) /= No_Source
                           then
                              Source := Other_Part (Source);
                           end if;

                           String_Element_Table.Increment_Last
                             (Shared.String_Elements);

                           Shared.String_Elements.Table
                             (String_Element_Table.Last
                                (Shared.String_Elements)) :=
                             (Value         => Name_Id (Source.Dep_Name),
                              Index         => 0,
                              Display_Value => Name_Id (Source.Dep_Name),
                              Location      => No_Location,
                              Flag          => False,
                              Next          => Interface_ALIs);

                           Interface_ALIs :=
                             String_Element_Table.Last
                               (Shared.String_Elements);

                        --  File based case

                        else
                           String_Element_Table.Increment_Last
                             (Shared.String_Elements);

                           Shared.String_Elements.Table
                             (String_Element_Table.Last
                                (Shared.String_Elements)) :=
                             (Value         => Name_Id (Source.File),
                              Index         => 0,
                              Display_Value => Name_Id (Source.Display_File),
                              Location      => No_Location,
                              Flag          => False,
                              Next          => Other_Interfaces);

                           Other_Interfaces :=
                             String_Element_Table.Last
                               (Shared.String_Elements);
                        end if;

                        Debug_Output
                          ("interface: ", Name_Id (Source.Path.Name));
                     end if;

                     exit Big_Loop;
                  end if;

                  Next (Iter);
               end loop;

               Project_2 := Project_2.Extends;
            end loop Big_Loop;

            if Source = No_Source then
               Error_Msg_File_1 := File_Name_Type (Element.Value);
               Error_Msg_Name_1 := Project.Name;

               Error_Msg
                 (Data.Flags,
                  "{ cannot be an interface of project %% "
                  & "as it is not one of its sources",
                  Element.Location, Project);
            end if;

            List := Element.Next;
         end loop;

         Project.Interfaces_Defined := True;
         Project.Lib_Interface_ALIs := Interface_ALIs;
         Project.Other_Interfaces   := Other_Interfaces;

      elsif Project.Library and then not Library_Interface.Default then

         --  Set In_Interfaces to False for all sources. It will be set to True
         --  later for the sources in the Library_Interface list.

         Project_2 := Project;
         while Project_2 /= No_Project loop
            Iter := For_Each_Source (Data.Tree, Project_2);
            loop
               Source := Prj.Element (Iter);
               exit when Source = No_Source;
               Source.In_Interfaces := False;
               Next (Iter);
            end loop;

            Project_2 := Project_2.Extends;
         end loop;

         List := Library_Interface.Values;
         while List /= Nil_String loop
            Element := Shared.String_Elements.Table (List);
            Get_Name_String (Element.Value);
            To_Lower (Name_Buffer (1 .. Name_Len));
            Name := Name_Find;
            Unit_Found := False;

            Project_2 := Project;
            Big_Loop_2 : while Project_2 /= No_Project loop
               if Project.Qualifier = Aggregate_Library then

                  --  For an aggregate library we want to consider sources of
                  --  all aggregated projects.

                  Iter := For_Each_Source (Data.Tree);

               else
                  Iter := For_Each_Source (Data.Tree, Project_2);
               end if;

               loop
                  Source := Prj.Element (Iter);
                  exit when Source = No_Source;

                  if Source.Unit /= No_Unit_Index
                    and then Source.Unit.Name = Name_Id (Name)
                  then
                     if not Source.Locally_Removed then
                        Source.In_Interfaces := True;
                        Source.Declared_In_Interfaces := True;
                        Project.Interfaces_Defined := True;

                        Other := Other_Part (Source);

                        if Other /= No_Source then
                           Other.In_Interfaces := True;
                           Other.Declared_In_Interfaces := True;
                        end if;

                        Debug_Output
                          ("interface: ", Name_Id (Source.Path.Name));

                        if Source.Kind = Spec
                          and then Other_Part (Source) /= No_Source
                        then
                           Source := Other_Part (Source);
                        end if;

                        String_Element_Table.Increment_Last
                          (Shared.String_Elements);

                        Shared.String_Elements.Table
                          (String_Element_Table.Last
                             (Shared.String_Elements)) :=
                          (Value         => Name_Id (Source.Dep_Name),
                           Index         => 0,
                           Display_Value => Name_Id (Source.Dep_Name),
                           Location      => No_Location,
                           Flag          => False,
                           Next          => Interface_ALIs);

                        Interface_ALIs :=
                          String_Element_Table.Last (Shared.String_Elements);
                     end if;

                     Unit_Found := True;
                     exit Big_Loop_2;
                  end if;

                  Next (Iter);
               end loop;

               Project_2 := Project_2.Extends;
            end loop Big_Loop_2;

            if not Unit_Found then
               Error_Msg_Name_1 := Name_Id (Name);

               Error_Msg
                 (Data.Flags,
                  "%% is not a unit of this project",
                  Element.Location, Project);
            end if;

            List := Element.Next;
         end loop;

         Project.Lib_Interface_ALIs := Interface_ALIs;

      elsif Project.Extends /= No_Project
        and then Project.Extends.Interfaces_Defined
      then
         Project.Interfaces_Defined := True;

         Iter := For_Each_Source (Data.Tree, Project);
         loop
            Source := Prj.Element (Iter);
            exit when Source = No_Source;

            if not Source.Declared_In_Interfaces then
               Source.In_Interfaces := False;
            end if;

            Next (Iter);
         end loop;

         Project.Lib_Interface_ALIs := Project.Extends.Lib_Interface_ALIs;
      end if;
   end Check_Interfaces;

   ------------------------------
   -- Check_Library_Attributes --
   ------------------------------

   --  This procedure is awfully long (over 700 lines) should be broken up???

   procedure Check_Library_Attributes
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Attributes     : constant Prj.Variable_Id := Project.Decl.Attributes;

      Lib_Dir        : constant Prj.Variable_Value :=
                         Prj.Util.Value_Of
                           (Snames.Name_Library_Dir, Attributes, Shared);

      Lib_Name       : constant Prj.Variable_Value :=
                         Prj.Util.Value_Of
                           (Snames.Name_Library_Name, Attributes, Shared);

      Lib_Standalone : constant Prj.Variable_Value :=
                         Prj.Util.Value_Of
                           (Snames.Name_Library_Standalone,
                            Attributes, Shared);

      Lib_Version    : constant Prj.Variable_Value :=
                         Prj.Util.Value_Of
                           (Snames.Name_Library_Version, Attributes, Shared);

      Lib_ALI_Dir    : constant Prj.Variable_Value :=
                         Prj.Util.Value_Of
                           (Snames.Name_Library_Ali_Dir, Attributes, Shared);

      Lib_GCC        : constant Prj.Variable_Value :=
                         Prj.Util.Value_Of
                           (Snames.Name_Library_GCC, Attributes, Shared);

      The_Lib_Kind   : constant Prj.Variable_Value :=
                         Prj.Util.Value_Of
                           (Snames.Name_Library_Kind, Attributes, Shared);

      Imported_Project_List : Project_List;
      Continuation          : String_Access := No_Continuation_String'Access;
      Support_For_Libraries : Library_Support;

      Library_Directory_Present : Boolean;

      procedure Check_Library (Proj : Project_Id; Extends : Boolean);
      --  Check if an imported or extended project if also a library project

      -------------------
      -- Check_Library --
      -------------------

      procedure Check_Library (Proj : Project_Id; Extends : Boolean) is
         Src_Id : Source_Id;
         Iter   : Source_Iterator;

      begin
         if Proj /= No_Project then
            if not Proj.Library then

               --  The only not library projects that are OK are those that
               --  have no sources. However, header files from non-Ada
               --  languages are OK, as there is nothing to compile.

               Iter := For_Each_Source (Data.Tree, Proj);
               loop
                  Src_Id := Prj.Element (Iter);
                  exit when Src_Id = No_Source
                    or else Src_Id.Language.Config.Kind /= File_Based
                    or else Src_Id.Kind /= Spec;
                  Next (Iter);
               end loop;

               if Src_Id /= No_Source then
                  Error_Msg_Name_1 := Project.Name;
                  Error_Msg_Name_2 := Proj.Name;

                  if Extends then
                     if Project.Library_Kind /= Static then
                        Error_Msg
                          (Data.Flags,
                           Continuation.all &
                           "shared library project %% cannot extend " &
                           "project %% that is not a library project",
                           Project.Location, Project);
                        Continuation := Continuation_String'Access;
                     end if;

                  elsif not Unchecked_Shared_Lib_Imports
                    and then Project.Library_Kind /= Static
                  then
                     Error_Msg
                       (Data.Flags,
                        Continuation.all &
                        "shared library project %% cannot import project %% " &
                        "that is not a shared library project",
                        Project.Location, Project);
                     Continuation := Continuation_String'Access;
                  end if;
               end if;

            elsif Project.Library_Kind /= Static
              and then not Lib_Standalone.Default
              and then Get_Name_String (Lib_Standalone.Value) = "encapsulated"
              and then Proj.Library_Kind /= Static
            then
               --  An encapsulated library must depend only on static libraries

               Error_Msg_Name_1 := Project.Name;
               Error_Msg_Name_2 := Proj.Name;

               Error_Msg
                 (Data.Flags,
                  Continuation.all &
                    "encapsulated library project %% cannot import shared " &
                    "library project %%",
                  Project.Location, Project);
               Continuation := Continuation_String'Access;

            elsif Project.Library_Kind /= Static
              and then Proj.Library_Kind = Static
              and then
                (Lib_Standalone.Default
                  or else
                    Get_Name_String (Lib_Standalone.Value) /= "encapsulated")
            then
               Error_Msg_Name_1 := Project.Name;
               Error_Msg_Name_2 := Proj.Name;

               if Extends then
                  Error_Msg
                    (Data.Flags,
                     Continuation.all &
                     "shared library project %% cannot extend static " &
                     "library project %%",
                     Project.Location, Project);
                  Continuation := Continuation_String'Access;

               elsif not Unchecked_Shared_Lib_Imports then
                  Error_Msg
                    (Data.Flags,
                     Continuation.all &
                     "shared library project %% cannot import static " &
                     "library project %%",
                     Project.Location, Project);
                  Continuation := Continuation_String'Access;
               end if;

            end if;
         end if;
      end Check_Library;

      Dir_Exists : Boolean;

   --  Start of processing for Check_Library_Attributes

   begin
      Library_Directory_Present := Lib_Dir.Value /= Empty_String;

      --  Special case of extending project

      if Project.Extends /= No_Project then

         --  If the project extended is a library project, we inherit the
         --  library name, if it is not redefined; we check that the library
         --  directory is specified.

         if Project.Extends.Library then
            if Project.Qualifier = Standard then
               Error_Msg
                 (Data.Flags,
                  "a standard project cannot extend a library project",
                  Project.Location, Project);

            else
               if Lib_Name.Default then
                  Project.Library_Name := Project.Extends.Library_Name;
               end if;

               if Lib_Dir.Default then
                  if not Project.Virtual then
                     Error_Msg
                       (Data.Flags,
                        "a project extending a library project must " &
                        "specify an attribute Library_Dir",
                        Project.Location, Project);

                  else
                     --  For a virtual project extending a library project,
                     --  inherit library directory and library kind.

                     Project.Library_Dir := Project.Extends.Library_Dir;
                     Library_Directory_Present := True;
                     Project.Library_Kind := Project.Extends.Library_Kind;
                  end if;
               end if;
            end if;
         end if;
      end if;

      pragma Assert (Lib_Name.Kind = Single);

      if Lib_Name.Value = Empty_String then
         if Current_Verbosity = High
           and then Project.Library_Name = No_Name
         then
            Debug_Indent;
            Write_Line ("no library name");
         end if;

      else
         --  There is no restriction on the syntax of library names

         Project.Library_Name := Lib_Name.Value;
      end if;

      if Project.Library_Name /= No_Name then
         if Current_Verbosity = High then
            Write_Attr
              ("Library name: ", Get_Name_String (Project.Library_Name));
         end if;

         pragma Assert (Lib_Dir.Kind = Single);

         if not Library_Directory_Present then
            Debug_Output ("no library directory");

         else
            --  Find path name (unless inherited), check that it is a directory

            if Project.Library_Dir = No_Path_Information then
               Locate_Directory
                 (Project,
                  File_Name_Type (Lib_Dir.Value),
                  Path             => Project.Library_Dir,
                  Dir_Exists       => Dir_Exists,
                  Data             => Data,
                  Create           => "library",
                  Must_Exist       => False,
                  Location         => Lib_Dir.Location,
                  Externally_Built => Project.Externally_Built);

            else
               Dir_Exists :=
                 Is_Directory
                   (Get_Name_String (Project.Library_Dir.Display_Name));
            end if;

            if not Dir_Exists then
               if Directories_Must_Exist_In_Projects then

                  --  Get the absolute name of the library directory that does
                  --  not exist, to report an error.

                  Err_Vars.Error_Msg_File_1 :=
                    File_Name_Type (Project.Library_Dir.Display_Name);
                  Error_Msg
                    (Data.Flags,
                     "library directory { does not exist",
                     Lib_Dir.Location, Project);

               else
                  Project.Library_Dir := No_Path_Information;
               end if;

            --  Checks for object/source directories

            elsif not Project.Externally_Built

              --  An aggregate library does not have sources or objects, so
              --  these tests are not required in this case.

              and then Project.Qualifier /= Aggregate_Library
            then
               --  Library directory cannot be the same as Object directory

               if Project.Library_Dir.Name = Project.Object_Directory.Name then
                  Error_Msg
                    (Data.Flags,
                     "library directory cannot be the same " &
                     "as object directory",
                     Lib_Dir.Location, Project);
                  Project.Library_Dir := No_Path_Information;

               else
                  declare
                     OK       : Boolean := True;
                     Dirs_Id  : String_List_Id;
                     Dir_Elem : String_Element;
                     Pid      : Project_List;

                  begin
                     --  The library directory cannot be the same as a source
                     --  directory of the current project.

                     Dirs_Id := Project.Source_Dirs;
                     while Dirs_Id /= Nil_String loop
                        Dir_Elem := Shared.String_Elements.Table (Dirs_Id);
                        Dirs_Id  := Dir_Elem.Next;

                        if Project.Library_Dir.Name =
                          Path_Name_Type (Dir_Elem.Value)
                        then
                           Err_Vars.Error_Msg_File_1 :=
                             File_Name_Type (Dir_Elem.Value);
                           Error_Msg
                             (Data.Flags,
                              "library directory cannot be the same "
                              & "as source directory {",
                              Lib_Dir.Location, Project);
                           OK := False;
                           exit;
                        end if;
                     end loop;

                     if OK then

                        --  The library directory cannot be the same as a
                        --  source directory of another project either.

                        Pid := Data.Tree.Projects;
                        Project_Loop : loop
                           exit Project_Loop when Pid = null;

                           if Pid.Project /= Project then
                              Dirs_Id := Pid.Project.Source_Dirs;

                              Dir_Loop : while Dirs_Id /= Nil_String loop
                                 Dir_Elem :=
                                   Shared.String_Elements.Table (Dirs_Id);
                                 Dirs_Id  := Dir_Elem.Next;

                                 if Project.Library_Dir.Name =
                                   Path_Name_Type (Dir_Elem.Value)
                                 then
                                    Err_Vars.Error_Msg_File_1 :=
                                      File_Name_Type (Dir_Elem.Value);
                                    Err_Vars.Error_Msg_Name_1 :=
                                      Pid.Project.Name;

                                    Error_Msg
                                      (Data.Flags,
                                       "library directory cannot be the same "
                                       & "as source directory { of project %%",
                                       Lib_Dir.Location, Project);
                                    OK := False;
                                    exit Project_Loop;
                                 end if;
                              end loop Dir_Loop;
                           end if;

                           Pid := Pid.Next;
                        end loop Project_Loop;
                     end if;

                     if not OK then
                        Project.Library_Dir := No_Path_Information;

                     elsif Current_Verbosity = High then

                        --  Display the Library directory in high verbosity

                        Write_Attr
                          ("Library directory",
                           Get_Name_String (Project.Library_Dir.Display_Name));
                     end if;
                  end;
               end if;
            end if;
         end if;

      end if;

      Project.Library :=
        Project.Library_Dir /= No_Path_Information
        and then Project.Library_Name /= No_Name;

      if Project.Extends = No_Project then
         case Project.Qualifier is
            when Standard =>
               if Project.Library then
                  Error_Msg
                    (Data.Flags,
                     "a standard project cannot be a library project",
                     Lib_Name.Location, Project);
               end if;

            when Library | Aggregate_Library =>
               if not Project.Library then
                  if Project.Library_Name = No_Name then
                     Error_Msg
                       (Data.Flags,
                        "attribute Library_Name not declared",
                        Project.Location, Project);

                     if not Library_Directory_Present then
                        Error_Msg
                          (Data.Flags,
                           "\attribute Library_Dir not declared",
                           Project.Location, Project);
                     end if;

                  elsif Project.Library_Dir = No_Path_Information then
                     Error_Msg
                       (Data.Flags,
                        "attribute Library_Dir not declared",
                        Project.Location, Project);
                  end if;
               end if;

            when others =>
               null;
         end case;
      end if;

      if Project.Library then
         Support_For_Libraries := Project.Config.Lib_Support;

         if not Project.Externally_Built
           and then Support_For_Libraries = Prj.None
         then
            Error_Msg
              (Data.Flags,
               "?libraries are not supported on this platform",
               Lib_Name.Location, Project);
            Project.Library := False;

         else
            if Lib_ALI_Dir.Value = Empty_String then
               Debug_Output ("no library ALI directory specified");
               Project.Library_ALI_Dir := Project.Library_Dir;

            else
               --  Find path name, check that it is a directory

               Locate_Directory
                 (Project,
                  File_Name_Type (Lib_ALI_Dir.Value),
                  Path             => Project.Library_ALI_Dir,
                  Create           => "library ALI",
                  Dir_Exists       => Dir_Exists,
                  Data             => Data,
                  Must_Exist       => False,
                  Location         => Lib_ALI_Dir.Location,
                  Externally_Built => Project.Externally_Built);

               if not Dir_Exists then

                  --  Get the absolute name of the library ALI directory that
                  --  does not exist, to report an error.

                  Err_Vars.Error_Msg_File_1 :=
                    File_Name_Type (Project.Library_ALI_Dir.Display_Name);
                  Error_Msg
                    (Data.Flags,
                     "library 'A'L'I directory { does not exist",
                     Lib_ALI_Dir.Location, Project);
               end if;

               if not Project.Externally_Built
                 and then Project.Library_ALI_Dir /= Project.Library_Dir
               then
                  --  The library ALI directory cannot be the same as the
                  --  Object directory.

                  if Project.Library_ALI_Dir = Project.Object_Directory then
                     Error_Msg
                       (Data.Flags,
                        "library 'A'L'I directory cannot be the same " &
                        "as object directory",
                        Lib_ALI_Dir.Location, Project);
                     Project.Library_ALI_Dir := No_Path_Information;

                  else
                     declare
                        OK       : Boolean := True;
                        Dirs_Id  : String_List_Id;
                        Dir_Elem : String_Element;
                        Pid      : Project_List;

                     begin
                        --  The library ALI directory cannot be the same as
                        --  a source directory of the current project.

                        Dirs_Id := Project.Source_Dirs;
                        while Dirs_Id /= Nil_String loop
                           Dir_Elem := Shared.String_Elements.Table (Dirs_Id);
                           Dirs_Id  := Dir_Elem.Next;

                           if Project.Library_ALI_Dir.Name =
                             Path_Name_Type (Dir_Elem.Value)
                           then
                              Err_Vars.Error_Msg_File_1 :=
                                File_Name_Type (Dir_Elem.Value);
                              Error_Msg
                                (Data.Flags,
                                 "library 'A'L'I directory cannot be " &
                                 "the same as source directory {",
                                 Lib_ALI_Dir.Location, Project);
                              OK := False;
                              exit;
                           end if;
                        end loop;

                        if OK then

                           --  The library ALI directory cannot be the same as
                           --  a source directory of another project either.

                           Pid := Data.Tree.Projects;
                           ALI_Project_Loop : loop
                              exit ALI_Project_Loop when Pid = null;

                              if Pid.Project /= Project then
                                 Dirs_Id := Pid.Project.Source_Dirs;

                                 ALI_Dir_Loop :
                                 while Dirs_Id /= Nil_String loop
                                    Dir_Elem :=
                                      Shared.String_Elements.Table (Dirs_Id);
                                    Dirs_Id  := Dir_Elem.Next;

                                    if Project.Library_ALI_Dir.Name =
                                        Path_Name_Type (Dir_Elem.Value)
                                    then
                                       Err_Vars.Error_Msg_File_1 :=
                                         File_Name_Type (Dir_Elem.Value);
                                       Err_Vars.Error_Msg_Name_1 :=
                                         Pid.Project.Name;

                                       Error_Msg
                                         (Data.Flags,
                                          "library 'A'L'I directory cannot " &
                                          "be the same as source directory " &
                                          "{ of project %%",
                                          Lib_ALI_Dir.Location, Project);
                                       OK := False;
                                       exit ALI_Project_Loop;
                                    end if;
                                 end loop ALI_Dir_Loop;
                              end if;
                              Pid := Pid.Next;
                           end loop ALI_Project_Loop;
                        end if;

                        if not OK then
                           Project.Library_ALI_Dir := No_Path_Information;

                        elsif Current_Verbosity = High then

                           --  Display Library ALI directory in high verbosity

                           Write_Attr
                             ("Library ALI dir",
                              Get_Name_String
                                (Project.Library_ALI_Dir.Display_Name));
                        end if;
                     end;
                  end if;
               end if;
            end if;

            pragma Assert (Lib_Version.Kind = Single);

            if Lib_Version.Value = Empty_String then
               Debug_Output ("no library version specified");

            else
               Project.Lib_Internal_Name := Lib_Version.Value;
            end if;

            pragma Assert (The_Lib_Kind.Kind = Single);

            if The_Lib_Kind.Value = Empty_String then
               Debug_Output ("no library kind specified");

            else
               Get_Name_String (The_Lib_Kind.Value);

               declare
                  Kind_Name : constant String :=
                                To_Lower (Name_Buffer (1 .. Name_Len));

                  OK : Boolean := True;

               begin
                  if Kind_Name = "static" then
                     Project.Library_Kind := Static;

                  elsif Kind_Name = "dynamic" then
                     Project.Library_Kind := Dynamic;

                  elsif Kind_Name = "relocatable" then
                     Project.Library_Kind := Relocatable;

                  else
                     Error_Msg
                       (Data.Flags,
                        "illegal value for Library_Kind",
                        The_Lib_Kind.Location, Project);
                     OK := False;
                  end if;

                  if Current_Verbosity = High and then OK then
                     Write_Attr ("Library kind", Kind_Name);
                  end if;

                  if Project.Library_Kind /= Static then
                     if not Project.Externally_Built
                       and then Support_For_Libraries = Prj.Static_Only
                     then
                        Error_Msg
                          (Data.Flags,
                           "only static libraries are supported " &
                           "on this platform",
                           The_Lib_Kind.Location, Project);
                        Project.Library := False;

                     else
                        --  Check if (obsolescent) attribute Library_GCC or
                        --  Linker'Driver is declared.

                        if Lib_GCC.Value /= Empty_String then
                           Error_Msg
                             (Data.Flags,
                              "?Library_'G'C'C is an obsolescent attribute, " &
                              "use Linker''Driver instead",
                              Lib_GCC.Location, Project);
                           Project.Config.Shared_Lib_Driver :=
                             File_Name_Type (Lib_GCC.Value);

                        else
                           declare
                              Linker : constant Package_Id :=
                                         Value_Of
                                           (Name_Linker,
                                            Project.Decl.Packages,
                                            Shared);
                              Driver : constant Variable_Value :=
                                         Value_Of
                                           (Name                 => No_Name,
                                            Attribute_Or_Array_Name =>
                                              Name_Driver,
                                            In_Package           => Linker,
                                            Shared               => Shared);

                           begin
                              if Driver /= Nil_Variable_Value
                                 and then Driver.Value /= Empty_String
                              then
                                 Project.Config.Shared_Lib_Driver :=
                                   File_Name_Type (Driver.Value);
                              end if;
                           end;
                        end if;
                     end if;
                  end if;
               end;
            end if;

            if Project.Library
              and then Project.Qualifier /= Aggregate_Library
            then
               Debug_Output ("this is a library project file");

               Check_Library (Project.Extends, Extends => True);

               Imported_Project_List := Project.Imported_Projects;
               while Imported_Project_List /= null loop
                  Check_Library
                    (Imported_Project_List.Project,
                     Extends => False);
                  Imported_Project_List := Imported_Project_List.Next;
               end loop;
            end if;
         end if;
      end if;

      --  Check if Linker'Switches or Linker'Default_Switches are declared.
      --  Warn if they are declared, as it is a common error to think that
      --  library are "linked" with Linker switches.

      if Project.Library then
         declare
            Linker_Package_Id : constant Package_Id :=
                                  Util.Value_Of
                                    (Name_Linker,
                                     Project.Decl.Packages, Shared);
            Linker_Package    : Package_Element;
            Switches          : Array_Element_Id := No_Array_Element;

         begin
            if Linker_Package_Id /= No_Package then
               Linker_Package := Shared.Packages.Table (Linker_Package_Id);

               Switches :=
                 Value_Of
                   (Name      => Name_Switches,
                    In_Arrays => Linker_Package.Decl.Arrays,
                    Shared    => Shared);

               if Switches = No_Array_Element then
                  Switches :=
                    Value_Of
                      (Name      => Name_Default_Switches,
                       In_Arrays => Linker_Package.Decl.Arrays,
                       Shared    => Shared);
               end if;

               if Switches /= No_Array_Element then
                  Error_Msg
                    (Data.Flags,
                     "?Linker switches not taken into account in library " &
                     "projects",
                     No_Location, Project);
               end if;
            end if;
         end;
      end if;

      if Project.Extends /= No_Project and then Project.Extends.Library then

         --  Remove the library name from Lib_Data_Table

         for J in 1 .. Lib_Data_Table.Last loop
            if Lib_Data_Table.Table (J).Proj = Project.Extends then
               Lib_Data_Table.Table (J) :=
                 Lib_Data_Table.Table (Lib_Data_Table.Last);
               Lib_Data_Table.Set_Last (Lib_Data_Table.Last - 1);
               exit;
            end if;
         end loop;
      end if;

      if Project.Library and then not Lib_Name.Default then

         --  Check if the same library name is used in an other library project

         for J in 1 .. Lib_Data_Table.Last loop
            if Lib_Data_Table.Table (J).Name = Project.Library_Name
              and then Lib_Data_Table.Table (J).Tree = Data.Tree
            then
               Error_Msg_Name_1 := Lib_Data_Table.Table (J).Proj.Name;
               Error_Msg
                 (Data.Flags,
                  "Library name cannot be the same as in project %%",
                  Lib_Name.Location, Project);
               Project.Library := False;
               exit;
            end if;
         end loop;
      end if;

      if not Lib_Standalone.Default
        and then Project.Library_Kind = Static
      then
         --  An standalone library must be a shared library

         Error_Msg_Name_1 := Project.Name;

         Error_Msg
           (Data.Flags,
            Continuation.all &
              "standalone library project %% must be a shared library",
            Project.Location, Project);
         Continuation := Continuation_String'Access;
      end if;

      if Project.Library and not Data.In_Aggregate_Lib then

         --  Record the library name

         Lib_Data_Table.Append
           ((Name => Project.Library_Name,
             Proj => Project,
             Tree => Data.Tree));
      end if;
   end Check_Library_Attributes;

   --------------------------
   -- Check_Package_Naming --
   --------------------------

   procedure Check_Package_Naming
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared    : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;
      Naming_Id : constant Package_Id :=
                    Util.Value_Of
                      (Name_Naming, Project.Decl.Packages, Shared);
      Naming    : Package_Element;

      Ada_Body_Suffix_Loc : Source_Ptr := No_Location;

      procedure Check_Naming;
      --  Check the validity of the Naming package (suffixes valid, ...)

      procedure Check_Common
        (Dot_Replacement : in out File_Name_Type;
         Casing          : in out Casing_Type;
         Casing_Defined  : out Boolean;
         Separate_Suffix : in out File_Name_Type;
         Sep_Suffix_Loc  : out Source_Ptr);
      --  Check attributes common

      procedure Process_Exceptions_File_Based
        (Lang_Id : Language_Ptr;
         Kind    : Source_Kind);
      procedure Process_Exceptions_Unit_Based
        (Lang_Id : Language_Ptr;
         Kind    : Source_Kind);
      --  Process the naming exceptions for the two types of languages

      procedure Initialize_Naming_Data;
      --  Initialize internal naming data for the various languages

      ------------------
      -- Check_Common --
      ------------------

      procedure Check_Common
        (Dot_Replacement : in out File_Name_Type;
         Casing          : in out Casing_Type;
         Casing_Defined  : out Boolean;
         Separate_Suffix : in out File_Name_Type;
         Sep_Suffix_Loc  : out Source_Ptr)
      is
         Dot_Repl      : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Dot_Replacement,
                              Naming.Decl.Attributes,
                              Shared);
         Casing_String : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Casing,
                              Naming.Decl.Attributes,
                              Shared);
         Sep_Suffix    : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Separate_Suffix,
                              Naming.Decl.Attributes,
                              Shared);
         Dot_Repl_Loc  : Source_Ptr;

      begin
         Sep_Suffix_Loc := No_Location;

         if not Dot_Repl.Default then
            pragma Assert
              (Dot_Repl.Kind = Single, "Dot_Replacement is not a string");

            if Length_Of_Name (Dot_Repl.Value) = 0 then
               Error_Msg
                 (Data.Flags, "Dot_Replacement cannot be empty",
                  Dot_Repl.Location, Project);
            end if;

            Dot_Replacement := Canonical_Case_File_Name (Dot_Repl.Value);
            Dot_Repl_Loc    := Dot_Repl.Location;

            declare
               Repl : constant String := Get_Name_String (Dot_Replacement);

            begin
               --  Dot_Replacement cannot
               --   - be empty
               --   - start or end with an alphanumeric
               --   - be a single '_'
               --   - start with an '_' followed by an alphanumeric
               --   - contain a '.' except if it is "."

               if Repl'Length = 0
                 or else Is_Alphanumeric (Repl (Repl'First))
                 or else Is_Alphanumeric (Repl (Repl'Last))
                 or else (Repl (Repl'First) = '_'
                           and then
                             (Repl'Length = 1
                               or else
                                 Is_Alphanumeric (Repl (Repl'First + 1))))
                 or else (Repl'Length > 1
                           and then
                             Index (Source => Repl, Pattern => ".") /= 0)
               then
                  Error_Msg
                    (Data.Flags,
                     '"' & Repl &
                     """ is illegal for Dot_Replacement.",
                     Dot_Repl_Loc, Project);
               end if;
            end;
         end if;

         if Dot_Replacement /= No_File then
            Write_Attr
              ("Dot_Replacement", Get_Name_String (Dot_Replacement));
         end if;

         Casing_Defined := False;

         if not Casing_String.Default then
            pragma Assert
              (Casing_String.Kind = Single, "Casing is not a string");

            declare
               Casing_Image : constant String :=
                                Get_Name_String (Casing_String.Value);

            begin
               if Casing_Image'Length = 0 then
                  Error_Msg
                    (Data.Flags,
                     "Casing cannot be an empty string",
                     Casing_String.Location, Project);
               end if;

               Casing := Value (Casing_Image);
               Casing_Defined := True;

            exception
               when Constraint_Error =>
                  Name_Len := Casing_Image'Length;
                  Name_Buffer (1 .. Name_Len) := Casing_Image;
                  Err_Vars.Error_Msg_Name_1 := Name_Find;
                  Error_Msg
                    (Data.Flags,
                     "%% is not a correct Casing",
                     Casing_String.Location, Project);
            end;
         end if;

         Write_Attr ("Casing", Image (Casing));

         if not Sep_Suffix.Default then
            if Length_Of_Name (Sep_Suffix.Value) = 0 then
               Error_Msg
                 (Data.Flags,
                  "Separate_Suffix cannot be empty",
                  Sep_Suffix.Location, Project);

            else
               Separate_Suffix := Canonical_Case_File_Name (Sep_Suffix.Value);
               Sep_Suffix_Loc  := Sep_Suffix.Location;

               Check_Illegal_Suffix
                 (Project, Separate_Suffix,
                  Dot_Replacement, "Separate_Suffix", Sep_Suffix.Location,
                  Data);
            end if;
         end if;

         if Separate_Suffix /= No_File then
            Write_Attr
              ("Separate_Suffix", Get_Name_String (Separate_Suffix));
         end if;
      end Check_Common;

      -----------------------------------
      -- Process_Exceptions_File_Based --
      -----------------------------------

      procedure Process_Exceptions_File_Based
        (Lang_Id : Language_Ptr;
         Kind    : Source_Kind)
      is
         Lang           : constant Name_Id := Lang_Id.Name;
         Exceptions     : Array_Element_Id;
         Exception_List : Variable_Value;
         Element_Id     : String_List_Id;
         Element        : String_Element;
         File_Name      : File_Name_Type;
         Source         : Source_Id;

      begin
         case Kind is
            when Impl | Sep =>
               Exceptions :=
                 Value_Of
                   (Name_Implementation_Exceptions,
                    In_Arrays => Naming.Decl.Arrays,
                    Shared    => Shared);

            when Spec =>
               Exceptions :=
                 Value_Of
                   (Name_Specification_Exceptions,
                    In_Arrays => Naming.Decl.Arrays,
                    Shared    => Shared);
         end case;

         Exception_List :=
           Value_Of
             (Index    => Lang,
              In_Array => Exceptions,
              Shared   => Shared);

         if Exception_List /= Nil_Variable_Value then
            Element_Id := Exception_List.Values;
            while Element_Id /= Nil_String loop
               Element   := Shared.String_Elements.Table (Element_Id);
               File_Name := Canonical_Case_File_Name (Element.Value);

               Source :=
                 Source_Files_Htable.Get
                   (Data.Tree.Source_Files_HT, File_Name);
               while Source /= No_Source
                 and then Source.Project /= Project
               loop
                  Source := Source.Next_With_File_Name;
               end loop;

               if Source = No_Source then
                  Add_Source
                    (Id               => Source,
                     Data             => Data,
                     Project          => Project,
                     Source_Dir_Rank  => 0,
                     Lang_Id          => Lang_Id,
                     Kind             => Kind,
                     File_Name        => File_Name,
                     Display_File     => File_Name_Type (Element.Value),
                     Naming_Exception => Yes,
                     Location         => Element.Location);

               else
                  --  Check if the file name is already recorded for another
                  --  language or another kind.

                  if Source.Language /= Lang_Id then
                     Error_Msg
                       (Data.Flags,
                        "the same file cannot be a source of two languages",
                        Element.Location, Project);

                  elsif Source.Kind /= Kind then
                     Error_Msg
                       (Data.Flags,
                        "the same file cannot be a source and a template",
                        Element.Location, Project);
                  end if;

                  --  If the file is already recorded for the same
                  --  language and the same kind, it means that the file
                  --  name appears several times in the *_Exceptions
                  --  attribute; so there is nothing to do.
               end if;

               Element_Id := Element.Next;
            end loop;
         end if;
      end Process_Exceptions_File_Based;

      -----------------------------------
      -- Process_Exceptions_Unit_Based --
      -----------------------------------

      procedure Process_Exceptions_Unit_Based
        (Lang_Id : Language_Ptr;
         Kind    : Source_Kind)
      is
         Exceptions : Array_Element_Id;
         Element    : Array_Element;
         Unit       : Name_Id;
         Index      : Int;
         File_Name  : File_Name_Type;
         Source     : Source_Id;

         Naming_Exception : Naming_Exception_Type;

      begin
         case Kind is
            when Impl | Sep =>
               Exceptions :=
                 Value_Of
                   (Name_Body,
                    In_Arrays => Naming.Decl.Arrays,
                    Shared    => Shared);

               if Exceptions = No_Array_Element then
                  Exceptions :=
                    Value_Of
                      (Name_Implementation,
                       In_Arrays => Naming.Decl.Arrays,
                       Shared    => Shared);
               end if;

            when Spec =>
               Exceptions :=
                 Value_Of
                   (Name_Spec,
                    In_Arrays => Naming.Decl.Arrays,
                    Shared    => Shared);

               if Exceptions = No_Array_Element then
                  Exceptions :=
                    Value_Of
                      (Name_Specification,
                       In_Arrays => Naming.Decl.Arrays,
                       Shared    => Shared);
               end if;
         end case;

         while Exceptions /= No_Array_Element loop
            Element   := Shared.Array_Elements.Table (Exceptions);

            if Element.Restricted then
               Naming_Exception := Inherited;
            else
               Naming_Exception := Yes;
            end if;

            File_Name := Canonical_Case_File_Name (Element.Value.Value);

            Get_Name_String (Element.Index);
            To_Lower (Name_Buffer (1 .. Name_Len));
            Index := Element.Value.Index;

            --  Check if it is a valid unit name

            Get_Name_String (Element.Index);
            Check_Unit_Name (Name_Buffer (1 .. Name_Len), Unit);

            if Unit = No_Name then
               Err_Vars.Error_Msg_Name_1 := Element.Index;
               Error_Msg
                 (Data.Flags,
                  "%% is not a valid unit name.",
                  Element.Value.Location, Project);
            end if;

            if Unit /= No_Name then
               Add_Source
                 (Id               => Source,
                  Data             => Data,
                  Project          => Project,
                  Source_Dir_Rank  => 0,
                  Lang_Id          => Lang_Id,
                  Kind             => Kind,
                  File_Name        => File_Name,
                  Display_File     => File_Name_Type (Element.Value.Value),
                  Unit             => Unit,
                  Index            => Index,
                  Location         => Element.Value.Location,
                  Naming_Exception => Naming_Exception);
            end if;

            Exceptions := Element.Next;
         end loop;
      end Process_Exceptions_Unit_Based;

      ------------------
      -- Check_Naming --
      ------------------

      procedure Check_Naming is
         Dot_Replacement : File_Name_Type :=
                             File_Name_Type
                               (First_Name_Id + Character'Pos ('-'));
         Separate_Suffix : File_Name_Type := No_File;
         Casing          : Casing_Type    := All_Lower_Case;
         Casing_Defined  : Boolean;
         Lang_Id         : Language_Ptr;
         Sep_Suffix_Loc  : Source_Ptr;
         Suffix          : Variable_Value;
         Lang            : Name_Id;

      begin
         Check_Common
           (Dot_Replacement => Dot_Replacement,
            Casing          => Casing,
            Casing_Defined  => Casing_Defined,
            Separate_Suffix => Separate_Suffix,
            Sep_Suffix_Loc  => Sep_Suffix_Loc);

         --  For all unit based languages, if any, set the specified value
         --  of Dot_Replacement, Casing and/or Separate_Suffix. Do not
         --  systematically overwrite, since the defaults come from the
         --  configuration file.

         if Dot_Replacement /= No_File
           or else Casing_Defined
           or else Separate_Suffix /= No_File
         then
            Lang_Id := Project.Languages;
            while Lang_Id /= No_Language_Index loop
               if Lang_Id.Config.Kind = Unit_Based then
                  if Dot_Replacement /= No_File then
                     Lang_Id.Config.Naming_Data.Dot_Replacement :=
                         Dot_Replacement;
                  end if;

                  if Casing_Defined then
                     Lang_Id.Config.Naming_Data.Casing := Casing;
                  end if;
               end if;

               Lang_Id := Lang_Id.Next;
            end loop;
         end if;

         --  Next, get the spec and body suffixes

         Lang_Id := Project.Languages;
         while Lang_Id /= No_Language_Index loop
            Lang := Lang_Id.Name;

            --  Spec_Suffix

            Suffix := Value_Of
              (Name                    => Lang,
               Attribute_Or_Array_Name => Name_Spec_Suffix,
               In_Package              => Naming_Id,
               Shared                  => Shared);

            if Suffix = Nil_Variable_Value then
               Suffix := Value_Of
                 (Name                    => Lang,
                  Attribute_Or_Array_Name => Name_Specification_Suffix,
                  In_Package              => Naming_Id,
                  Shared                  => Shared);
            end if;

            if Suffix /= Nil_Variable_Value then
               Lang_Id.Config.Naming_Data.Spec_Suffix :=
                   File_Name_Type (Suffix.Value);

               Check_Illegal_Suffix
                 (Project,
                  Lang_Id.Config.Naming_Data.Spec_Suffix,
                  Lang_Id.Config.Naming_Data.Dot_Replacement,
                  "Spec_Suffix", Suffix.Location, Data);

               Write_Attr
                 ("Spec_Suffix",
                  Get_Name_String (Lang_Id.Config.Naming_Data.Spec_Suffix));
            end if;

            --  Body_Suffix

            Suffix :=
              Value_Of
                (Name                    => Lang,
                 Attribute_Or_Array_Name => Name_Body_Suffix,
                 In_Package              => Naming_Id,
                 Shared                  => Shared);

            if Suffix = Nil_Variable_Value then
               Suffix :=
                 Value_Of
                   (Name                    => Lang,
                    Attribute_Or_Array_Name => Name_Implementation_Suffix,
                    In_Package              => Naming_Id,
                    Shared                  => Shared);
            end if;

            if Suffix /= Nil_Variable_Value then
               Lang_Id.Config.Naming_Data.Body_Suffix :=
                 File_Name_Type (Suffix.Value);

               --  The default value of separate suffix should be the same as
               --  the body suffix, so we need to compute that first.

               if Separate_Suffix = No_File then
                  Lang_Id.Config.Naming_Data.Separate_Suffix :=
                    Lang_Id.Config.Naming_Data.Body_Suffix;
                  Write_Attr
                    ("Sep_Suffix",
                     Get_Name_String
                       (Lang_Id.Config.Naming_Data.Separate_Suffix));
               else
                  Lang_Id.Config.Naming_Data.Separate_Suffix :=
                    Separate_Suffix;
               end if;

               Check_Illegal_Suffix
                 (Project,
                  Lang_Id.Config.Naming_Data.Body_Suffix,
                  Lang_Id.Config.Naming_Data.Dot_Replacement,
                  "Body_Suffix", Suffix.Location, Data);

               Write_Attr
                 ("Body_Suffix",
                  Get_Name_String (Lang_Id.Config.Naming_Data.Body_Suffix));

            elsif Separate_Suffix /= No_File then
               Lang_Id.Config.Naming_Data.Separate_Suffix := Separate_Suffix;
            end if;

            --  Spec_Suffix cannot be equal to Body_Suffix or Separate_Suffix,
            --  since that would cause a clear ambiguity. Note that we do allow
            --  a Spec_Suffix to have the same termination as one of these,
            --  which causes a potential ambiguity, but we resolve that by
            --  matching the longest possible suffix.

            if Lang_Id.Config.Naming_Data.Spec_Suffix /= No_File
              and then Lang_Id.Config.Naming_Data.Spec_Suffix =
                       Lang_Id.Config.Naming_Data.Body_Suffix
            then
               Error_Msg
                 (Data.Flags,
                  "Body_Suffix ("""
                  & Get_Name_String (Lang_Id.Config.Naming_Data.Body_Suffix)
                  & """) cannot be the same as Spec_Suffix.",
                  Ada_Body_Suffix_Loc, Project);
            end if;

            if Lang_Id.Config.Naming_Data.Body_Suffix /=
               Lang_Id.Config.Naming_Data.Separate_Suffix
              and then Lang_Id.Config.Naming_Data.Spec_Suffix =
                       Lang_Id.Config.Naming_Data.Separate_Suffix
            then
               Error_Msg
                 (Data.Flags,
                  "Separate_Suffix ("""
                  & Get_Name_String
                    (Lang_Id.Config.Naming_Data.Separate_Suffix)
                  & """) cannot be the same as Spec_Suffix.",
                  Sep_Suffix_Loc, Project);
            end if;

            Lang_Id := Lang_Id.Next;
         end loop;

         --  Get the naming exceptions for all languages, but not for virtual
         --  projects.

         if not Project.Virtual then
            for Kind in Spec_Or_Body loop
               Lang_Id := Project.Languages;
               while Lang_Id /= No_Language_Index loop
                  case Lang_Id.Config.Kind is
                  when File_Based =>
                     Process_Exceptions_File_Based (Lang_Id, Kind);

                  when Unit_Based =>
                     Process_Exceptions_Unit_Based (Lang_Id, Kind);
                  end case;

                  Lang_Id := Lang_Id.Next;
               end loop;
            end loop;
         end if;
      end Check_Naming;

      ----------------------------
      -- Initialize_Naming_Data --
      ----------------------------

      procedure Initialize_Naming_Data is
         Specs : Array_Element_Id :=
                   Util.Value_Of
                     (Name_Spec_Suffix,
                      Naming.Decl.Arrays,
                      Shared);

         Impls : Array_Element_Id :=
                   Util.Value_Of
                     (Name_Body_Suffix,
                      Naming.Decl.Arrays,
                      Shared);

         Lang      : Language_Ptr;
         Lang_Name : Name_Id;
         Value     : Variable_Value;
         Extended  : Project_Id;

      begin
         --  At this stage, the project already contains the default extensions
         --  for the various languages. We now merge those suffixes read in the
         --  user project, and they override the default.

         while Specs /= No_Array_Element loop
            Lang_Name := Shared.Array_Elements.Table (Specs).Index;
            Lang :=
              Get_Language_From_Name
                (Project, Name => Get_Name_String (Lang_Name));

            --  An extending project inherits its parent projects' languages
            --  so if needed we should create entries for those languages

            if Lang = null  then
               Extended := Project.Extends;
               while Extended /= null loop
                  Lang := Get_Language_From_Name
                    (Extended, Name => Get_Name_String (Lang_Name));
                  exit when Lang /= null;

                  Extended := Extended.Extends;
               end loop;

               if Lang /= null then
                  Lang := new Language_Data'(Lang.all);
                  Lang.First_Source := null;
                  Lang.Next := Project.Languages;
                  Project.Languages := Lang;
               end if;
            end if;

            --  If language was not found in project or the projects it extends

            if Lang = null then
               Debug_Output
                 ("ignoring spec naming data (lang. not in project): ",
                  Lang_Name);

            else
               Value := Shared.Array_Elements.Table (Specs).Value;

               if Value.Kind = Single then
                  Lang.Config.Naming_Data.Spec_Suffix :=
                    Canonical_Case_File_Name (Value.Value);
               end if;
            end if;

            Specs := Shared.Array_Elements.Table (Specs).Next;
         end loop;

         while Impls /= No_Array_Element loop
            Lang_Name := Shared.Array_Elements.Table (Impls).Index;
            Lang :=
              Get_Language_From_Name
                (Project, Name => Get_Name_String (Lang_Name));

            if Lang = null then
               Debug_Output
                 ("ignoring impl naming data (lang. not in project): ",
                  Lang_Name);
            else
               Value := Shared.Array_Elements.Table (Impls).Value;

               if Lang.Name = Name_Ada then
                  Ada_Body_Suffix_Loc := Value.Location;
               end if;

               if Value.Kind = Single then
                  Lang.Config.Naming_Data.Body_Suffix :=
                    Canonical_Case_File_Name (Value.Value);
               end if;
            end if;

            Impls := Shared.Array_Elements.Table (Impls).Next;
         end loop;
      end Initialize_Naming_Data;

   --  Start of processing for Check_Naming_Schemes

   begin
      --  No Naming package or parsing a configuration file? nothing to do

      if Naming_Id /= No_Package
        and then Project.Qualifier /= Configuration
      then
         Naming := Shared.Packages.Table (Naming_Id);
         Debug_Increase_Indent ("checking package Naming for ", Project.Name);
         Initialize_Naming_Data;
         Check_Naming;
         Debug_Decrease_Indent ("done checking package naming");
      end if;
   end Check_Package_Naming;

   ---------------------------------
   -- Check_Programming_Languages --
   ---------------------------------

   procedure Check_Programming_Languages
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Languages   : Variable_Value := Nil_Variable_Value;
      Def_Lang    : Variable_Value := Nil_Variable_Value;
      Def_Lang_Id : Name_Id;

      procedure Add_Language (Name, Display_Name : Name_Id);
      --  Add a new language to the list of languages for the project.
      --  Nothing is done if the language has already been defined

      ------------------
      -- Add_Language --
      ------------------

      procedure Add_Language (Name, Display_Name : Name_Id) is
         Lang : Language_Ptr;

      begin
         Lang := Project.Languages;
         while Lang /= No_Language_Index loop
            if Name = Lang.Name then
               return;
            end if;

            Lang := Lang.Next;
         end loop;

         Lang              := new Language_Data'(No_Language_Data);
         Lang.Next         := Project.Languages;
         Project.Languages := Lang;
         Lang.Name         := Name;
         Lang.Display_Name := Display_Name;
      end Add_Language;

   --  Start of processing for Check_Programming_Languages

   begin
      Project.Languages := null;
      Languages :=
        Prj.Util.Value_Of (Name_Languages, Project.Decl.Attributes, Shared);
      Def_Lang :=
        Prj.Util.Value_Of
          (Name_Default_Language, Project.Decl.Attributes, Shared);

      if Project.Source_Dirs /= Nil_String then

         --  Check if languages are specified in this project

         if Languages.Default then

            --  Fail if there is no default language defined

            if Def_Lang.Default then
               Error_Msg
                 (Data.Flags,
                  "no languages defined for this project",
                  Project.Location, Project);
               Def_Lang_Id := No_Name;

            else
               Get_Name_String (Def_Lang.Value);
               To_Lower (Name_Buffer (1 .. Name_Len));
               Def_Lang_Id := Name_Find;
            end if;

            if Def_Lang_Id /= No_Name then
               Get_Name_String (Def_Lang_Id);
               Name_Buffer (1) := GNAT.Case_Util.To_Upper (Name_Buffer (1));
               Add_Language
                 (Name         => Def_Lang_Id,
                  Display_Name => Name_Find);
            end if;

         else
            declare
               Current : String_List_Id := Languages.Values;
               Element : String_Element;

            begin
               --  If there are no languages declared, there are no sources

               if Current = Nil_String then
                  Project.Source_Dirs := Nil_String;

                  if Project.Qualifier = Standard then
                     Error_Msg
                       (Data.Flags,
                        "a standard project must have at least one language",
                        Languages.Location, Project);
                  end if;

               else
                  --  Look through all the languages specified in attribute
                  --  Languages.

                  while Current /= Nil_String loop
                     Element := Shared.String_Elements.Table (Current);
                     Get_Name_String (Element.Value);
                     To_Lower (Name_Buffer (1 .. Name_Len));

                     Add_Language
                       (Name         => Name_Find,
                        Display_Name => Element.Value);

                     Current := Element.Next;
                  end loop;
               end if;
            end;
         end if;
      end if;
   end Check_Programming_Languages;

   -------------------------------
   -- Check_Stand_Alone_Library --
   -------------------------------

   procedure Check_Stand_Alone_Library
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Lib_Name            : constant Prj.Variable_Value :=
                              Prj.Util.Value_Of
                               (Snames.Name_Library_Name,
                                Project.Decl.Attributes,
                                Shared);

      Lib_Standalone      : constant Prj.Variable_Value :=
                              Prj.Util.Value_Of
                                (Snames.Name_Library_Standalone,
                                 Project.Decl.Attributes,
                                 Shared);

      Lib_Auto_Init       : constant Prj.Variable_Value :=
                              Prj.Util.Value_Of
                                (Snames.Name_Library_Auto_Init,
                                 Project.Decl.Attributes,
                                 Shared);

      Lib_Src_Dir         : constant Prj.Variable_Value :=
                              Prj.Util.Value_Of
                                (Snames.Name_Library_Src_Dir,
                                 Project.Decl.Attributes,
                                 Shared);

      Lib_Symbol_File     : constant Prj.Variable_Value :=
                              Prj.Util.Value_Of
                                (Snames.Name_Library_Symbol_File,
                                 Project.Decl.Attributes,
                                 Shared);

      Lib_Symbol_Policy   : constant Prj.Variable_Value :=
                              Prj.Util.Value_Of
                                (Snames.Name_Library_Symbol_Policy,
                                 Project.Decl.Attributes,
                                 Shared);

      Lib_Ref_Symbol_File : constant Prj.Variable_Value :=
                              Prj.Util.Value_Of
                                (Snames.Name_Library_Reference_Symbol_File,
                                 Project.Decl.Attributes,
                                 Shared);

      Auto_Init_Supported : Boolean;
      OK                  : Boolean := True;

   begin
      Auto_Init_Supported := Project.Config.Auto_Init_Supported;

      --  It is a stand-alone library project file if there is at least one
      --  unit in the declared or inherited interface.

      if Project.Lib_Interface_ALIs = Nil_String then
         if not Lib_Standalone.Default
           and then Get_Name_String (Lib_Standalone.Value) /= "no"
         then
            Error_Msg
              (Data.Flags,
               "Library_Standalone valid only if Library_Interface is set",
               Lib_Standalone.Location, Project);
         end if;

      else
         if Project.Standalone_Library = No then
            Project.Standalone_Library := Standard;
         end if;

         --  The name of a stand-alone library needs to have the syntax of an
         --  Ada identifier.

         declare
            Name : constant String := Get_Name_String (Project.Library_Name);
            OK   : Boolean         := Is_Letter (Name (Name'First));

            Underline : Boolean := False;

         begin
            for J in Name'First + 1 .. Name'Last loop
               exit when not OK;

               if Is_Alphanumeric (Name (J)) then
                  Underline := False;

               elsif Name (J) = '_' then
                  if Underline then
                     OK := False;
                  else
                     Underline := True;
                  end if;

               else
                  OK := False;
               end if;
            end loop;

            OK := OK and not Underline;

            if not OK then
               Error_Msg
                 (Data.Flags,
                  "Incorrect library name for a Stand-Alone Library",
                  Lib_Name.Location, Project);
               return;
            end if;
         end;

         if Lib_Standalone.Default then
            Project.Standalone_Library := Standard;

         else
            Get_Name_String (Lib_Standalone.Value);
            To_Lower (Name_Buffer (1 .. Name_Len));

            if Name_Buffer (1 .. Name_Len) = "standard" then
               Project.Standalone_Library := Standard;

            elsif Name_Buffer (1 .. Name_Len) = "encapsulated" then
               Project.Standalone_Library := Encapsulated;

            elsif Name_Buffer (1 .. Name_Len) = "no" then
               Project.Standalone_Library := No;
               Error_Msg
                 (Data.Flags,
                  "wrong value for Library_Standalone "
                  & "when Library_Interface defined",
                  Lib_Standalone.Location, Project);

            else
               Error_Msg
                 (Data.Flags,
                  "invalid value for attribute Library_Standalone",
                  Lib_Standalone.Location, Project);
            end if;
         end if;

         --  Check value of attribute Library_Auto_Init and set Lib_Auto_Init
         --  accordingly.

         if Lib_Auto_Init.Default then

            --  If no attribute Library_Auto_Init is declared, then set auto
            --  init only if it is supported.

            Project.Lib_Auto_Init := Auto_Init_Supported;

         else
            Get_Name_String (Lib_Auto_Init.Value);
            To_Lower (Name_Buffer (1 .. Name_Len));

            if Name_Buffer (1 .. Name_Len) = "false" then
               Project.Lib_Auto_Init := False;

            elsif Name_Buffer (1 .. Name_Len) = "true" then
               if Auto_Init_Supported then
                  Project.Lib_Auto_Init := True;

               else
                  --  Library_Auto_Init cannot be "true" if auto init is not
                  --  supported.

                  Error_Msg
                    (Data.Flags,
                     "library auto init not supported " &
                     "on this platform",
                     Lib_Auto_Init.Location, Project);
               end if;

            else
               Error_Msg
                 (Data.Flags,
                  "invalid value for attribute Library_Auto_Init",
                  Lib_Auto_Init.Location, Project);
            end if;
         end if;

         --  If attribute Library_Src_Dir is defined and not the empty string,
         --  check if the directory exist and is not the object directory or
         --  one of the source directories. This is the directory where copies
         --  of the interface sources will be copied. Note that this directory
         --  may be the library directory.

         if Lib_Src_Dir.Value /= Empty_String then
            declare
               Dir_Id     : constant File_Name_Type :=
                              File_Name_Type (Lib_Src_Dir.Value);
               Dir_Exists : Boolean;

            begin
               Locate_Directory
                 (Project,
                  Dir_Id,
                  Path             => Project.Library_Src_Dir,
                  Dir_Exists       => Dir_Exists,
                  Data             => Data,
                  Must_Exist       => False,
                  Create           => "library source copy",
                  Location         => Lib_Src_Dir.Location,
                  Externally_Built => Project.Externally_Built);

               --  If directory does not exist, report an error

               if not Dir_Exists then

                  --  Get the absolute name of the library directory that does
                  --  not exist, to report an error.

                  Err_Vars.Error_Msg_File_1 :=
                    File_Name_Type (Project.Library_Src_Dir.Display_Name);
                  Error_Msg
                    (Data.Flags,
                     "Directory { does not exist",
                     Lib_Src_Dir.Location, Project);

                  --  Report error if it is the same as the object directory

               elsif Project.Library_Src_Dir = Project.Object_Directory then
                  Error_Msg
                    (Data.Flags,
                     "directory to copy interfaces cannot be " &
                     "the object directory",
                     Lib_Src_Dir.Location, Project);
                  Project.Library_Src_Dir := No_Path_Information;

               else
                  declare
                     Src_Dirs : String_List_Id;
                     Src_Dir  : String_Element;
                     Pid      : Project_List;

                  begin
                     --  Interface copy directory cannot be one of the source
                     --  directory of the current project.

                     Src_Dirs := Project.Source_Dirs;
                     while Src_Dirs /= Nil_String loop
                        Src_Dir := Shared.String_Elements.Table (Src_Dirs);

                        --  Report error if it is one of the source directories

                        if Project.Library_Src_Dir.Name =
                             Path_Name_Type (Src_Dir.Value)
                        then
                           Error_Msg
                             (Data.Flags,
                              "directory to copy interfaces cannot " &
                              "be one of the source directories",
                              Lib_Src_Dir.Location, Project);
                           Project.Library_Src_Dir := No_Path_Information;
                           exit;
                        end if;

                        Src_Dirs := Src_Dir.Next;
                     end loop;

                     if Project.Library_Src_Dir /= No_Path_Information then

                        --  It cannot be a source directory of any other
                        --  project either.

                        Pid := Data.Tree.Projects;
                        Project_Loop : loop
                           exit Project_Loop when Pid = null;

                           Src_Dirs := Pid.Project.Source_Dirs;
                           Dir_Loop : while Src_Dirs /= Nil_String loop
                              Src_Dir :=
                                Shared.String_Elements.Table (Src_Dirs);

                              --  Report error if it is one of the source
                              --  directories.

                              if Project.Library_Src_Dir.Name =
                                Path_Name_Type (Src_Dir.Value)
                              then
                                 Error_Msg_File_1 :=
                                   File_Name_Type (Src_Dir.Value);
                                 Error_Msg_Name_1 := Pid.Project.Name;
                                 Error_Msg
                                   (Data.Flags,
                                    "directory to copy interfaces cannot " &
                                    "be the same as source directory { of " &
                                    "project %%",
                                    Lib_Src_Dir.Location, Project);
                                 Project.Library_Src_Dir :=
                                   No_Path_Information;
                                 exit Project_Loop;
                              end if;

                              Src_Dirs := Src_Dir.Next;
                           end loop Dir_Loop;

                           Pid := Pid.Next;
                        end loop Project_Loop;
                     end if;
                  end;

                  --  In high verbosity, if there is a valid Library_Src_Dir,
                  --  display its path name.

                  if Project.Library_Src_Dir /= No_Path_Information
                    and then Current_Verbosity = High
                  then
                     Write_Attr
                       ("Directory to copy interfaces",
                        Get_Name_String (Project.Library_Src_Dir.Name));
                  end if;
               end if;
            end;
         end if;

         --  Check the symbol related attributes

         --  First, the symbol policy

         if not Lib_Symbol_Policy.Default then
            declare
               Value : constant String :=
                         To_Lower
                           (Get_Name_String (Lib_Symbol_Policy.Value));

            begin
               --  Symbol policy must have one of a limited number of values

               if Value = "autonomous" or else Value = "default" then
                  Project.Symbol_Data.Symbol_Policy := Autonomous;

               elsif Value = "compliant" then
                  Project.Symbol_Data.Symbol_Policy := Compliant;

               elsif Value = "controlled" then
                  Project.Symbol_Data.Symbol_Policy := Controlled;

               elsif Value = "restricted" then
                  Project.Symbol_Data.Symbol_Policy := Restricted;

               elsif Value = "direct" then
                  Project.Symbol_Data.Symbol_Policy := Direct;

               else
                  Error_Msg
                    (Data.Flags,
                     "illegal value for Library_Symbol_Policy",
                     Lib_Symbol_Policy.Location, Project);
               end if;
            end;
         end if;

         --  If attribute Library_Symbol_File is not specified, symbol policy
         --  cannot be Restricted.

         if Lib_Symbol_File.Default then
            if Project.Symbol_Data.Symbol_Policy = Restricted then
               Error_Msg
                 (Data.Flags,
                  "Library_Symbol_File needs to be defined when " &
                  "symbol policy is Restricted",
                  Lib_Symbol_Policy.Location, Project);
            end if;

         else
            --  Library_Symbol_File is defined

            Project.Symbol_Data.Symbol_File :=
              Path_Name_Type (Lib_Symbol_File.Value);

            Get_Name_String (Lib_Symbol_File.Value);

            if Name_Len = 0 then
               Error_Msg
                 (Data.Flags,
                  "symbol file name cannot be an empty string",
                  Lib_Symbol_File.Location, Project);

            else
               OK := not Is_Absolute_Path (Name_Buffer (1 .. Name_Len));

               if OK then
                  for J in 1 .. Name_Len loop
                     if Name_Buffer (J) = '/'
                       or else Name_Buffer (J) = Directory_Separator
                     then
                        OK := False;
                        exit;
                     end if;
                  end loop;
               end if;

               if not OK then
                  Error_Msg_File_1 := File_Name_Type (Lib_Symbol_File.Value);
                  Error_Msg
                    (Data.Flags,
                     "symbol file name { is illegal. " &
                     "Name cannot include directory info.",
                     Lib_Symbol_File.Location, Project);
               end if;
            end if;
         end if;

         --  If attribute Library_Reference_Symbol_File is not defined,
         --  symbol policy cannot be Compliant or Controlled.

         if Lib_Ref_Symbol_File.Default then
            if Project.Symbol_Data.Symbol_Policy = Compliant
              or else Project.Symbol_Data.Symbol_Policy = Controlled
            then
               Error_Msg
                 (Data.Flags,
                  "a reference symbol file needs to be defined",
                  Lib_Symbol_Policy.Location, Project);
            end if;

         else
            --  Library_Reference_Symbol_File is defined, check file exists

            Project.Symbol_Data.Reference :=
              Path_Name_Type (Lib_Ref_Symbol_File.Value);

            Get_Name_String (Lib_Ref_Symbol_File.Value);

            if Name_Len = 0 then
               Error_Msg
                 (Data.Flags,
                  "reference symbol file name cannot be an empty string",
                  Lib_Symbol_File.Location, Project);

            else
               if not Is_Absolute_Path (Name_Buffer (1 .. Name_Len)) then
                  Name_Len := 0;
                  Add_Str_To_Name_Buffer
                    (Get_Name_String (Project.Directory.Name));
                  Add_Str_To_Name_Buffer
                    (Get_Name_String (Lib_Ref_Symbol_File.Value));
                  Project.Symbol_Data.Reference := Name_Find;
               end if;

               if not Is_Regular_File
                        (Get_Name_String (Project.Symbol_Data.Reference))
               then
                  Error_Msg_File_1 :=
                    File_Name_Type (Lib_Ref_Symbol_File.Value);

                  --  For controlled and direct symbol policies, it is an error
                  --  if the reference symbol file does not exist. For other
                  --  symbol policies, this is just a warning

                  Error_Msg_Warn :=
                    Project.Symbol_Data.Symbol_Policy /= Controlled
                    and then Project.Symbol_Data.Symbol_Policy /= Direct;

                  Error_Msg
                    (Data.Flags,
                     "<library reference symbol file { does not exist",
                     Lib_Ref_Symbol_File.Location, Project);

                  --  In addition in the non-controlled case, if symbol policy
                  --  is Compliant, it is changed to Autonomous, because there
                  --  is no reference to check against, and we don't want to
                  --  fail in this case.

                  if Project.Symbol_Data.Symbol_Policy /= Controlled then
                     if Project.Symbol_Data.Symbol_Policy = Compliant then
                        Project.Symbol_Data.Symbol_Policy := Autonomous;
                     end if;
                  end if;
               end if;

               --  If both the reference symbol file and the symbol file are
               --  defined, then check that they are not the same file.

               if Project.Symbol_Data.Symbol_File /= No_Path then
                  Get_Name_String (Project.Symbol_Data.Symbol_File);

                  if Name_Len > 0 then
                     declare
                        --  We do not need to pass a Directory to
                        --  Normalize_Pathname, since the path_information
                        --  already contains absolute information.

                        Symb_Path : constant String :=
                                      Normalize_Pathname
                                        (Get_Name_String
                                           (Project.Object_Directory.Name) &
                                         Name_Buffer (1 .. Name_Len),
                                         Directory     => "/",
                                         Resolve_Links =>
                                           Opt.Follow_Links_For_Files);
                        Ref_Path  : constant String :=
                                      Normalize_Pathname
                                        (Get_Name_String
                                           (Project.Symbol_Data.Reference),
                                         Directory     => "/",
                                         Resolve_Links =>
                                           Opt.Follow_Links_For_Files);
                     begin
                        if Symb_Path = Ref_Path then
                           Error_Msg
                             (Data.Flags,
                              "library reference symbol file and library" &
                              " symbol file cannot be the same file",
                              Lib_Ref_Symbol_File.Location, Project);
                        end if;
                     end;
                  end if;
               end if;
            end if;
         end if;
      end if;
   end Check_Stand_Alone_Library;

   ---------------------
   -- Check_Unit_Name --
   ---------------------

   procedure Check_Unit_Name (Name : String; Unit : out Name_Id) is
      The_Name        : String := Name;
      Real_Name       : Name_Id;
      Need_Letter     : Boolean := True;
      Last_Underscore : Boolean := False;
      OK              : Boolean := The_Name'Length > 0;
      First           : Positive;

      function Is_Reserved (Name : Name_Id) return Boolean;
      function Is_Reserved (S    : String)  return Boolean;
      --  Check that the given name is not an Ada 95 reserved word. The reason
      --  for the Ada 95 here is that we do not want to exclude the case of an
      --  Ada 95 unit called Interface (for example). In Ada 2005, such a unit
      --  name would be rejected anyway by the compiler. That means there is no
      --  requirement that the project file parser reject this.

      -----------------
      -- Is_Reserved --
      -----------------

      function Is_Reserved (S : String) return Boolean is
      begin
         Name_Len := 0;
         Add_Str_To_Name_Buffer (S);
         return Is_Reserved (Name_Find);
      end Is_Reserved;

      -----------------
      -- Is_Reserved --
      -----------------

      function Is_Reserved (Name : Name_Id) return Boolean is
      begin
         if Get_Name_Table_Byte (Name) /= 0
           and then
             not Nam_In (Name, Name_Project, Name_Extends, Name_External)
           and then Name not in Ada_2005_Reserved_Words
         then
            Unit := No_Name;
            Debug_Output ("Ada reserved word: ", Name);
            return True;

         else
            return False;
         end if;
      end Is_Reserved;

   --  Start of processing for Check_Unit_Name

   begin
      To_Lower (The_Name);

      Name_Len := The_Name'Length;
      Name_Buffer (1 .. Name_Len) := The_Name;

      --  Special cases of children of packages A, G, I and S on VMS

      if OpenVMS_On_Target
        and then Name_Len > 3
        and then Name_Buffer (2 .. 3) = "__"
        and then
          (Name_Buffer (1) = 'a' or else
           Name_Buffer (1) = 'g' or else
           Name_Buffer (1) = 'i' or else
           Name_Buffer (1) = 's')
      then
         Name_Buffer (2) := '.';
         Name_Buffer (3 .. Name_Len - 1) := Name_Buffer (4 .. Name_Len);
         Name_Len := Name_Len - 1;
      end if;

      Real_Name := Name_Find;

      if Is_Reserved (Real_Name) then
         return;
      end if;

      First := The_Name'First;

      for Index in The_Name'Range loop
         if Need_Letter then

            --  We need a letter (at the beginning, and following a dot),
            --  but we don't have one.

            if Is_Letter (The_Name (Index)) then
               Need_Letter := False;

            else
               OK := False;

               if Current_Verbosity = High then
                  Debug_Indent;
                  Write_Int  (Types.Int (Index));
                  Write_Str  (": '");
                  Write_Char (The_Name (Index));
                  Write_Line ("' is not a letter.");
               end if;

               exit;
            end if;

         elsif Last_Underscore
           and then (The_Name (Index) = '_' or else The_Name (Index) = '.')
         then
            --  Two underscores are illegal, and a dot cannot follow
            --  an underscore.

            OK := False;

            if Current_Verbosity = High then
               Debug_Indent;
               Write_Int  (Types.Int (Index));
               Write_Str  (": '");
               Write_Char (The_Name (Index));
               Write_Line ("' is illegal here.");
            end if;

            exit;

         elsif The_Name (Index) = '.' then

            --  First, check if the name before the dot is not a reserved word

            if Is_Reserved (The_Name (First .. Index - 1)) then
               return;
            end if;

            First := Index + 1;

            --  We need a letter after a dot

            Need_Letter := True;

         elsif The_Name (Index) = '_' then
            Last_Underscore := True;

         else
            --  We need an letter or a digit

            Last_Underscore := False;

            if not Is_Alphanumeric (The_Name (Index)) then
               OK := False;

               if Current_Verbosity = High then
                  Debug_Indent;
                  Write_Int  (Types.Int (Index));
                  Write_Str  (": '");
                  Write_Char (The_Name (Index));
                  Write_Line ("' is not alphanumeric.");
               end if;

               exit;
            end if;
         end if;
      end loop;

      --  Cannot end with an underscore or a dot

      OK := OK and then not Need_Letter and then not Last_Underscore;

      if OK then
         if First /= Name'First
           and then Is_Reserved (The_Name (First .. The_Name'Last))
         then
            return;
         end if;

         Unit := Real_Name;

      else
         --  Signal a problem with No_Name

         Unit := No_Name;
      end if;
   end Check_Unit_Name;

   ----------------------------
   -- Compute_Directory_Last --
   ----------------------------

   function Compute_Directory_Last (Dir : String) return Natural is
   begin
      if Dir'Length > 1
        and then (Dir (Dir'Last - 1) = Directory_Separator
                    or else
                  Dir (Dir'Last - 1) = '/')
      then
         return Dir'Last - 1;
      else
         return Dir'Last;
      end if;
   end Compute_Directory_Last;

   ---------------------
   -- Get_Directories --
   ---------------------

   procedure Get_Directories
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Object_Dir  : constant Variable_Value :=
                      Util.Value_Of
                        (Name_Object_Dir, Project.Decl.Attributes, Shared);

      Exec_Dir : constant Variable_Value :=
                   Util.Value_Of
                     (Name_Exec_Dir, Project.Decl.Attributes, Shared);

      Source_Dirs : constant Variable_Value :=
                      Util.Value_Of
                        (Name_Source_Dirs, Project.Decl.Attributes, Shared);

      Ignore_Source_Sub_Dirs : constant Variable_Value :=
                                 Util.Value_Of
                                   (Name_Ignore_Source_Sub_Dirs,
                                    Project.Decl.Attributes,
                                    Shared);

      Excluded_Source_Dirs : constant Variable_Value :=
                              Util.Value_Of
                                (Name_Excluded_Source_Dirs,
                                 Project.Decl.Attributes,
                                 Shared);

      Source_Files : constant Variable_Value :=
                      Util.Value_Of
                        (Name_Source_Files,
                         Project.Decl.Attributes, Shared);

      Last_Source_Dir   : String_List_Id    := Nil_String;
      Last_Src_Dir_Rank : Number_List_Index := No_Number_List;

      Languages : constant Variable_Value :=
                      Prj.Util.Value_Of
                        (Name_Languages, Project.Decl.Attributes, Shared);

      Remove_Source_Dirs : Boolean := False;

      procedure Add_To_Or_Remove_From_Source_Dirs
        (Path : Path_Information;
         Rank : Natural);
      --  When Removed = False, the directory Path_Id to the list of
      --  source_dirs if not already in the list. When Removed = True,
      --  removed directory Path_Id if in the list.

      procedure Find_Source_Dirs is new Expand_Subdirectory_Pattern
        (Add_To_Or_Remove_From_Source_Dirs);

      ---------------------------------------
      -- Add_To_Or_Remove_From_Source_Dirs --
      ---------------------------------------

      procedure Add_To_Or_Remove_From_Source_Dirs
        (Path : Path_Information;
         Rank : Natural)
      is
         List      : String_List_Id;
         Prev      : String_List_Id;
         Rank_List : Number_List_Index;
         Prev_Rank : Number_List_Index;
         Element   : String_Element;

      begin
         Prev      := Nil_String;
         Prev_Rank := No_Number_List;
         List      := Project.Source_Dirs;
         Rank_List := Project.Source_Dir_Ranks;
         while List /= Nil_String loop
            Element := Shared.String_Elements.Table (List);
            exit when Element.Value = Name_Id (Path.Name);
            Prev := List;
            List := Element.Next;
            Prev_Rank := Rank_List;
            Rank_List := Shared.Number_Lists.Table (Prev_Rank).Next;
         end loop;

         --  The directory is in the list if List is not Nil_String

         if not Remove_Source_Dirs and then List = Nil_String then
            Debug_Output ("adding source dir=", Name_Id (Path.Display_Name));

            String_Element_Table.Increment_Last (Shared.String_Elements);
            Element :=
              (Value         => Name_Id (Path.Name),
               Index         => 0,
               Display_Value => Name_Id (Path.Display_Name),
               Location      => No_Location,
               Flag          => False,
               Next          => Nil_String);

            Number_List_Table.Increment_Last (Shared.Number_Lists);

            if Last_Source_Dir = Nil_String then

               --  This is the first source directory

               Project.Source_Dirs :=
                 String_Element_Table.Last (Shared.String_Elements);
               Project.Source_Dir_Ranks :=
                 Number_List_Table.Last (Shared.Number_Lists);

            else
               --  We already have source directories, link the previous
               --  last to the new one.

               Shared.String_Elements.Table (Last_Source_Dir).Next :=
                 String_Element_Table.Last (Shared.String_Elements);
               Shared.Number_Lists.Table (Last_Src_Dir_Rank).Next :=
                 Number_List_Table.Last (Shared.Number_Lists);
            end if;

            --  And register this source directory as the new last

            Last_Source_Dir :=
              String_Element_Table.Last (Shared.String_Elements);
            Shared.String_Elements.Table (Last_Source_Dir) := Element;
            Last_Src_Dir_Rank := Number_List_Table.Last (Shared.Number_Lists);
            Shared.Number_Lists.Table (Last_Src_Dir_Rank) :=
              (Number => Rank, Next => No_Number_List);

         elsif Remove_Source_Dirs and then List /= Nil_String then

            --  Remove source dir if present

            if Prev = Nil_String then
               Project.Source_Dirs := Shared.String_Elements.Table (List).Next;
               Project.Source_Dir_Ranks :=
                 Shared.Number_Lists.Table (Rank_List).Next;

            else
               Shared.String_Elements.Table (Prev).Next :=
                 Shared.String_Elements.Table (List).Next;
               Shared.Number_Lists.Table (Prev_Rank).Next :=
                 Shared.Number_Lists.Table (Rank_List).Next;
            end if;
         end if;
      end Add_To_Or_Remove_From_Source_Dirs;

      --  Local declarations

      Dir_Exists : Boolean;

      No_Sources : constant Boolean :=
                     ((not Source_Files.Default
                        and then Source_Files.Values = Nil_String)
                      or else
                        (not Source_Dirs.Default
                          and then Source_Dirs.Values = Nil_String)
                      or else
                        (not Languages.Default
                          and then Languages.Values = Nil_String))
                     and then Project.Extends = No_Project;

   --  Start of processing for Get_Directories

   begin
      Debug_Output ("starting to look for directories");

      --  Set the object directory to its default which may be nil, if there
      --  is no sources in the project.

      if No_Sources then
         Project.Object_Directory := No_Path_Information;
      else
         Project.Object_Directory := Project.Directory;
      end if;

      --  Check the object directory

      if Object_Dir.Value /= Empty_String then
         Get_Name_String (Object_Dir.Value);

         if Name_Len = 0 then
            Error_Msg
              (Data.Flags,
               "Object_Dir cannot be empty",
               Object_Dir.Location, Project);

         elsif Setup_Projects
           and then No_Sources
           and then Project.Extends = No_Project
         then
            --  Do not create an object directory for a non extending project
            --  with no sources.

            Locate_Directory
              (Project,
               File_Name_Type (Object_Dir.Value),
               Path             => Project.Object_Directory,
               Dir_Exists       => Dir_Exists,
               Data             => Data,
               Location         => Object_Dir.Location,
               Must_Exist       => False,
               Externally_Built => Project.Externally_Built);

         else
            --  We check that the specified object directory does exist.
            --  However, even when it doesn't exist, we set it to a default
            --  value. This is for the benefit of tools that recover from
            --  errors; for example, these tools could create the non existent
            --  directory. We always return an absolute directory name though.

            Locate_Directory
              (Project,
               File_Name_Type (Object_Dir.Value),
               Path             => Project.Object_Directory,
               Create           => "object",
               Dir_Exists       => Dir_Exists,
               Data             => Data,
               Location         => Object_Dir.Location,
               Must_Exist       => False,
               Externally_Built => Project.Externally_Built);

            if not Dir_Exists and then not Project.Externally_Built then
               if Opt.Directories_Must_Exist_In_Projects then
                  --  The object directory does not exist, report an error if
                  --  the project is not externally built.

                  Err_Vars.Error_Msg_File_1 :=
                    File_Name_Type (Object_Dir.Value);
                  Error_Or_Warning
                    (Data.Flags, Data.Flags.Require_Obj_Dirs,
                     "object directory { not found",
                     Project.Location, Project);

               else
                  Project.Object_Directory := No_Path_Information;
               end if;
            end if;
         end if;

      elsif not No_Sources and then Subdirs /= null then
         Name_Len := 1;
         Name_Buffer (1) := '.';
         Locate_Directory
           (Project,
            Name_Find,
            Path             => Project.Object_Directory,
            Create           => "object",
            Dir_Exists       => Dir_Exists,
            Data             => Data,
            Location         => Object_Dir.Location,
            Externally_Built => Project.Externally_Built);
      end if;

      if Current_Verbosity = High then
         if Project.Object_Directory = No_Path_Information then
            Debug_Output ("no object directory");
         else
            Write_Attr
              ("Object directory",
               Get_Name_String (Project.Object_Directory.Display_Name));
         end if;
      end if;

      --  Check the exec directory

      --  We set the object directory to its default

      Project.Exec_Directory := Project.Object_Directory;

      if Exec_Dir.Value /= Empty_String then
         Get_Name_String (Exec_Dir.Value);

         if Name_Len = 0 then
            Error_Msg
              (Data.Flags,
               "Exec_Dir cannot be empty",
               Exec_Dir.Location, Project);

         elsif Setup_Projects
           and then No_Sources
           and then Project.Extends = No_Project
         then
            --  Do not create an exec directory for a non extending project
            --  with no sources.

            Locate_Directory
              (Project,
               File_Name_Type (Exec_Dir.Value),
               Path             => Project.Exec_Directory,
               Dir_Exists       => Dir_Exists,
               Data             => Data,
               Location         => Exec_Dir.Location,
               Externally_Built => Project.Externally_Built);

         else
            --  We check that the specified exec directory does exist

            Locate_Directory
              (Project,
               File_Name_Type (Exec_Dir.Value),
               Path             => Project.Exec_Directory,
               Dir_Exists       => Dir_Exists,
               Data             => Data,
               Create           => "exec",
               Location         => Exec_Dir.Location,
               Externally_Built => Project.Externally_Built);

            if not Dir_Exists then
               if Opt.Directories_Must_Exist_In_Projects then
                  Err_Vars.Error_Msg_File_1 := File_Name_Type (Exec_Dir.Value);
                  Error_Or_Warning
                    (Data.Flags, Data.Flags.Missing_Source_Files,
                     "exec directory { not found", Project.Location, Project);

               else
                  Project.Exec_Directory := No_Path_Information;
               end if;
            end if;
         end if;
      end if;

      if Current_Verbosity = High then
         if Project.Exec_Directory = No_Path_Information then
            Debug_Output ("no exec directory");
         else
            Debug_Output
              ("exec directory: ",
               Name_Id (Project.Exec_Directory.Display_Name));
         end if;
      end if;

      --  Look for the source directories

      Debug_Output ("starting to look for source directories");

      pragma Assert (Source_Dirs.Kind = List, "Source_Dirs is not a list");

      if not Source_Files.Default
        and then Source_Files.Values = Nil_String
      then
         Project.Source_Dirs := Nil_String;

         if Project.Qualifier = Standard then
            Error_Msg
              (Data.Flags,
               "a standard project cannot have no sources",
               Source_Files.Location, Project);
         end if;

      elsif Source_Dirs.Default then

         --  No Source_Dirs specified: the single source directory is the one
         --  containing the project file.

         Remove_Source_Dirs := False;
         Add_To_Or_Remove_From_Source_Dirs
           (Path => (Name         => Project.Directory.Name,
                     Display_Name => Project.Directory.Display_Name),
            Rank => 1);

      else
         Remove_Source_Dirs := False;
         Find_Source_Dirs
           (Project       => Project,
            Data          => Data,
            Patterns      => Source_Dirs.Values,
            Ignore        => Ignore_Source_Sub_Dirs.Values,
            Search_For    => Search_Directories,
            Resolve_Links => Opt.Follow_Links_For_Dirs);

         if Project.Source_Dirs = Nil_String
           and then Project.Qualifier = Standard
         then
            Error_Msg
              (Data.Flags,
               "a standard project cannot have no source directories",
               Source_Dirs.Location, Project);
         end if;
      end if;

      if not Excluded_Source_Dirs.Default
        and then Excluded_Source_Dirs.Values /= Nil_String
      then
         Remove_Source_Dirs := True;
         Find_Source_Dirs
           (Project       => Project,
            Data          => Data,
            Patterns      => Excluded_Source_Dirs.Values,
            Ignore        => Nil_String,
            Search_For    => Search_Directories,
            Resolve_Links => Opt.Follow_Links_For_Dirs);
      end if;

      Debug_Output ("putting source directories in canonical cases");

      declare
         Current : String_List_Id := Project.Source_Dirs;
         Element : String_Element;

      begin
         while Current /= Nil_String loop
            Element := Shared.String_Elements.Table (Current);
            if Element.Value /= No_Name then
               Element.Value :=
                 Name_Id (Canonical_Case_File_Name (Element.Value));
               Shared.String_Elements.Table (Current) := Element;
            end if;

            Current := Element.Next;
         end loop;
      end;
   end Get_Directories;

   ---------------
   -- Get_Mains --
   ---------------

   procedure Get_Mains
     (Project : Project_Id;
      Data    : in out Tree_Processing_Data)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Mains : constant Variable_Value :=
               Prj.Util.Value_Of
                 (Name_Main, Project.Decl.Attributes, Shared);
      List  : String_List_Id;
      Elem  : String_Element;

   begin
      Project.Mains := Mains.Values;

      --  If no Mains were specified, and if we are an extending project,
      --  inherit the Mains from the project we are extending.

      if Mains.Default then
         if not Project.Library and then Project.Extends /= No_Project then
            Project.Mains := Project.Extends.Mains;
         end if;

      --  In a library project file, Main cannot be specified

      elsif Project.Library then
         Error_Msg
           (Data.Flags,
            "a library project file cannot have Main specified",
            Mains.Location, Project);

      else
         List := Mains.Values;
         while List /= Nil_String loop
            Elem := Shared.String_Elements.Table (List);

            if Length_Of_Name (Elem.Value) = 0 then
               Error_Msg
                 (Data.Flags,
                  "?a main cannot have an empty name",
                  Elem.Location, Project);
               exit;
            end if;

            List := Elem.Next;
         end loop;
      end if;
   end Get_Mains;

   ---------------------------
   -- Get_Sources_From_File --
   ---------------------------

   procedure Get_Sources_From_File
     (Path     : String;
      Location : Source_Ptr;
      Project  : in out Project_Processing_Data;
      Data     : in out Tree_Processing_Data)
   is
      File        : Prj.Util.Text_File;
      Line        : String (1 .. 250);
      Last        : Natural;
      Source_Name : File_Name_Type;
      Name_Loc    : Name_Location;

   begin
      if Current_Verbosity = High then
         Debug_Output ("opening """ & Path & '"');
      end if;

      --  Open the file

      Prj.Util.Open (File, Path);

      if not Prj.Util.Is_Valid (File) then
         Error_Msg
           (Data.Flags, "file does not exist", Location, Project.Project);

      else
         --  Read the lines one by one

         while not Prj.Util.End_Of_File (File) loop
            Prj.Util.Get_Line (File, Line, Last);

            --  A non empty, non comment line should contain a file name

            if Last /= 0
              and then (Last = 1 or else Line (1 .. 2) /= "--")
            then
               Name_Len := Last;
               Name_Buffer (1 .. Name_Len) := Line (1 .. Last);
               Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
               Source_Name := Name_Find;

               --  Check that there is no directory information

               for J in 1 .. Last loop
                  if Line (J) = '/' or else Line (J) = Directory_Separator then
                     Error_Msg_File_1 := Source_Name;
                     Error_Msg
                       (Data.Flags,
                        "file name cannot include directory information ({)",
                        Location, Project.Project);
                     exit;
                  end if;
               end loop;

               Name_Loc := Source_Names_Htable.Get
                 (Project.Source_Names, Source_Name);

               if Name_Loc = No_Name_Location then
                  Name_Loc :=
                    (Name     => Source_Name,
                     Location => Location,
                     Source   => No_Source,
                     Listed   => True,
                     Found    => False);

               else
                  Name_Loc.Listed := True;
               end if;

               Source_Names_Htable.Set
                 (Project.Source_Names, Source_Name, Name_Loc);
            end if;
         end loop;

         Prj.Util.Close (File);

      end if;
   end Get_Sources_From_File;

   ------------------
   -- No_Space_Img --
   ------------------

   function No_Space_Img (N : Natural) return String is
      Image : constant String := N'Img;
   begin
      return Image (2 .. Image'Last);
   end No_Space_Img;

   -----------------------
   -- Compute_Unit_Name --
   -----------------------

   procedure Compute_Unit_Name
     (File_Name : File_Name_Type;
      Naming    : Lang_Naming_Data;
      Kind      : out Source_Kind;
      Unit      : out Name_Id;
      Project   : Project_Processing_Data)
   is
      Filename : constant String  := Get_Name_String (File_Name);
      Last     : Integer          := Filename'Last;
      Sep_Len  : Integer;
      Body_Len : Integer;
      Spec_Len : Integer;

      Unit_Except : Unit_Exception;
      Masked      : Boolean  := False;

   begin
      Unit := No_Name;
      Kind := Spec;

      if Naming.Separate_Suffix = No_File
        or else Naming.Body_Suffix = No_File
        or else Naming.Spec_Suffix = No_File
      then
         return;
      end if;

      if Naming.Dot_Replacement = No_File then
         Debug_Output ("no dot_replacement specified");
         return;
      end if;

      Sep_Len  := Integer (Length_Of_Name (Naming.Separate_Suffix));
      Spec_Len := Integer (Length_Of_Name (Naming.Spec_Suffix));
      Body_Len := Integer (Length_Of_Name (Naming.Body_Suffix));

      --  Choose the longest suffix that matches. If there are several matches,
      --  give priority to specs, then bodies, then separates.

      if Naming.Separate_Suffix /= Naming.Body_Suffix
        and then Suffix_Matches (Filename, Naming.Separate_Suffix)
      then
         Last := Filename'Last - Sep_Len;
         Kind := Sep;
      end if;

      if Filename'Last - Body_Len <= Last
        and then Suffix_Matches (Filename, Naming.Body_Suffix)
      then
         Last := Natural'Min (Last, Filename'Last - Body_Len);
         Kind := Impl;
      end if;

      if Filename'Last - Spec_Len <= Last
        and then Suffix_Matches (Filename, Naming.Spec_Suffix)
      then
         Last := Natural'Min (Last, Filename'Last - Spec_Len);
         Kind := Spec;
      end if;

      if Last = Filename'Last then
         Debug_Output ("no matching suffix");
         return;
      end if;

      --  Check that the casing matches

      if File_Names_Case_Sensitive then
         case Naming.Casing is
            when All_Lower_Case =>
               for J in Filename'First .. Last loop
                  if Is_Letter (Filename (J))
                    and then not Is_Lower (Filename (J))
                  then
                     Debug_Output ("invalid casing");
                     return;
                  end if;
               end loop;

            when All_Upper_Case =>
               for J in Filename'First .. Last loop
                  if Is_Letter (Filename (J))
                    and then not Is_Upper (Filename (J))
                  then
                     Debug_Output ("invalid casing");
                     return;
                  end if;
               end loop;

            when Mixed_Case | Unknown =>
               null;
         end case;
      end if;

      --  If Dot_Replacement is not a single dot, then there should not
      --  be any dot in the name.

      declare
         Dot_Repl : constant String :=
                      Get_Name_String (Naming.Dot_Replacement);

      begin
         if Dot_Repl /= "." then
            for Index in Filename'First .. Last loop
               if Filename (Index) = '.' then
                  Debug_Output ("invalid name, contains dot");
                  return;
               end if;
            end loop;

            Replace_Into_Name_Buffer
              (Filename (Filename'First .. Last), Dot_Repl, '.');

         else
            Name_Len := Last - Filename'First + 1;
            Name_Buffer (1 .. Name_Len) := Filename (Filename'First .. Last);
            Fixed.Translate
              (Source  => Name_Buffer (1 .. Name_Len),
               Mapping => Lower_Case_Map);
         end if;
      end;

      --  In the standard GNAT naming scheme, check for special cases: children
      --  or separates of A, G, I or S, and run time sources.

      if Is_Standard_GNAT_Naming (Naming)
        and then Name_Len >= 3
      then
         declare
            S1 : constant Character := Name_Buffer (1);
            S2 : constant Character := Name_Buffer (2);
            S3 : constant Character := Name_Buffer (3);

         begin
            if        S1 = 'a'
              or else S1 = 'g'
              or else S1 = 'i'
              or else S1 = 's'
            then
               --  Children or separates of packages A, G, I or S. These names
               --  are x__ ... or x~... (where x is a, g, i, or s). Both
               --  versions (x__... and x~...) are allowed in all platforms,
               --  because it is not possible to know the platform before
               --  processing of the project files.

               if S2 = '_' and then S3 = '_' then
                  Name_Buffer (2) := '.';
                  Name_Buffer (3 .. Name_Len - 1) :=
                    Name_Buffer (4 .. Name_Len);
                  Name_Len := Name_Len - 1;

               elsif S2 = '~' then
                  Name_Buffer (2) := '.';

               elsif S2 = '.' then

                  --  If it is potentially a run time source

                  null;
               end if;
            end if;
         end;
      end if;

      --  Name_Buffer contains the name of the unit in lower-cases. Check
      --  that this is a valid unit name

      Check_Unit_Name (Name_Buffer (1 .. Name_Len), Unit);

      --  If there is a naming exception for the same unit, the file is not
      --  a source for the unit.

      if Unit /= No_Name then
         Unit_Except :=
           Unit_Exceptions_Htable.Get (Project.Unit_Exceptions, Unit);

         if Kind = Spec then
            Masked := Unit_Except.Spec /= No_File
                        and then
                      Unit_Except.Spec /= File_Name;
         else
            Masked := Unit_Except.Impl /= No_File
                        and then
                      Unit_Except.Impl /= File_Name;
         end if;

         if Masked then
            if Current_Verbosity = High then
               Debug_Indent;
               Write_Str ("   """ & Filename & """ contains the ");

               if Kind = Spec then
                  Write_Str ("spec of a unit found in """);
                  Write_Str (Get_Name_String (Unit_Except.Spec));
               else
                  Write_Str ("body of a unit found in """);
                  Write_Str (Get_Name_String (Unit_Except.Impl));
               end if;

               Write_Line (""" (ignored)");
            end if;

            Unit := No_Name;
         end if;
      end if;

      if Unit /= No_Name
        and then Current_Verbosity = High
      then
         case Kind is
            when Spec => Debug_Output ("spec of", Unit);
            when Impl => Debug_Output ("body of", Unit);
            when Sep  => Debug_Output ("sep of", Unit);
         end case;
      end if;
   end Compute_Unit_Name;

   --------------------------
   -- Check_Illegal_Suffix --
   --------------------------

   procedure Check_Illegal_Suffix
     (Project         : Project_Id;
      Suffix          : File_Name_Type;
      Dot_Replacement : File_Name_Type;
      Attribute_Name  : String;
      Location        : Source_Ptr;
      Data            : in out Tree_Processing_Data)
   is
      Suffix_Str : constant String := Get_Name_String (Suffix);

   begin
      if Suffix_Str'Length = 0 then

         --  Always valid

         return;

      elsif Index (Suffix_Str, ".") = 0 then
         Err_Vars.Error_Msg_File_1 := Suffix;
         Error_Msg
           (Data.Flags,
            "{ is illegal for " & Attribute_Name & ": must have a dot",
            Location, Project);
         return;
      end if;

      --  Case of dot replacement is a single dot, and first character of
      --  suffix is also a dot.

      if Dot_Replacement /= No_File
        and then Get_Name_String (Dot_Replacement) = "."
        and then Suffix_Str (Suffix_Str'First) = '.'
      then
         for Index in Suffix_Str'First + 1 .. Suffix_Str'Last loop

            --  If there are multiple dots in the name

            if Suffix_Str (Index) = '.' then

               --  It is illegal to have a letter following the initial dot

               if Is_Letter (Suffix_Str (Suffix_Str'First + 1)) then
                  Err_Vars.Error_Msg_File_1 := Suffix;
                  Error_Msg
                    (Data.Flags,
                     "{ is illegal for " & Attribute_Name
                     & ": ambiguous prefix when Dot_Replacement is a dot",
                     Location, Project);
               end if;
               return;
            end if;
         end loop;
      end if;
   end Check_Illegal_Suffix;

   ----------------------
   -- Locate_Directory --
   ----------------------

   procedure Locate_Directory
     (Project          : Project_Id;
      Name             : File_Name_Type;
      Path             : out Path_Information;
      Dir_Exists       : out Boolean;
      Data             : in out Tree_Processing_Data;
      Create           : String := "";
      Location         : Source_Ptr := No_Location;
      Must_Exist       : Boolean := True;
      Externally_Built : Boolean := False)
   is
      Parent          : constant Path_Name_Type :=
                          Project.Directory.Display_Name;
      The_Parent      : constant String :=
                          Get_Name_String (Parent);
      The_Parent_Last : constant Natural :=
                          Compute_Directory_Last (The_Parent);
      Full_Name       : File_Name_Type;
      The_Name        : File_Name_Type;

   begin
      Get_Name_String (Name);

      --  Add Subdirs.all if it is a directory that may be created and
      --  Subdirs is not null;

      if Create /= "" and then Subdirs /= null then
         if Name_Buffer (Name_Len) /= Directory_Separator then
            Add_Char_To_Name_Buffer (Directory_Separator);
         end if;

         Add_Str_To_Name_Buffer (Subdirs.all);
      end if;

      --  Convert '/' to directory separator (for Windows)

      for J in 1 .. Name_Len loop
         if Name_Buffer (J) = '/' then
            Name_Buffer (J) := Directory_Separator;
         end if;
      end loop;

      The_Name := Name_Find;

      if Current_Verbosity = High then
         Debug_Indent;
         Write_Str ("Locate_Directory (""");
         Write_Str (Get_Name_String (The_Name));
         Write_Str (""", in """);
         Write_Str (The_Parent);
         Write_Line (""")");
      end if;

      Path := No_Path_Information;
      Dir_Exists := False;

      if Is_Absolute_Path (Get_Name_String (The_Name)) then
         Full_Name := The_Name;

      else
         Name_Len := 0;
         Add_Str_To_Name_Buffer
           (The_Parent (The_Parent'First .. The_Parent_Last));
         Add_Str_To_Name_Buffer (Get_Name_String (The_Name));
         Full_Name := Name_Find;
      end if;

      declare
         Full_Path_Name : String_Access :=
                            new String'(Get_Name_String (Full_Name));

      begin
         if (Setup_Projects or else Subdirs /= null)
           and then Create'Length > 0
         then
            if not Is_Directory (Full_Path_Name.all) then

               --  If project is externally built, do not create a subdir,
               --  use the specified directory, without the subdir.

               if Externally_Built then
                  if Is_Absolute_Path (Get_Name_String (Name)) then
                     Get_Name_String (Name);

                  else
                     Name_Len := 0;
                     Add_Str_To_Name_Buffer
                       (The_Parent (The_Parent'First .. The_Parent_Last));
                     Add_Str_To_Name_Buffer (Get_Name_String (Name));
                  end if;

                  Full_Path_Name := new String'(Name_Buffer (1 .. Name_Len));

               else
                  begin
                     Create_Path (Full_Path_Name.all);

                     if not Quiet_Output then
                        Write_Str (Create);
                        Write_Str (" directory """);
                        Write_Str (Full_Path_Name.all);
                        Write_Str (""" created for project ");
                        Write_Line (Get_Name_String (Project.Name));
                     end if;

                  exception
                     when Use_Error =>
                        Error_Msg
                          (Data.Flags,
                           "could not create " & Create &
                           " directory " & Full_Path_Name.all,
                           Location, Project);
                  end;
               end if;
            end if;
         end if;

         Dir_Exists := Is_Directory (Full_Path_Name.all);

         if not Must_Exist or else Dir_Exists then
            declare
               Normed : constant String :=
                          Normalize_Pathname
                            (Full_Path_Name.all,
                             Directory      =>
                              The_Parent (The_Parent'First .. The_Parent_Last),
                             Resolve_Links  => False,
                             Case_Sensitive => True);

               Canonical_Path : constant String :=
                                  Normalize_Pathname
                                    (Normed,
                                     Directory      =>
                                       The_Parent
                                         (The_Parent'First .. The_Parent_Last),
                                     Resolve_Links  =>
                                        Opt.Follow_Links_For_Dirs,
                                     Case_Sensitive => False);

            begin
               Name_Len := Normed'Length;
               Name_Buffer (1 .. Name_Len) := Normed;

               --  Directories should always end with a directory separator

               if Name_Buffer (Name_Len) /= Directory_Separator then
                  Add_Char_To_Name_Buffer (Directory_Separator);
               end if;

               Path.Display_Name := Name_Find;

               Name_Len := Canonical_Path'Length;
               Name_Buffer (1 .. Name_Len) := Canonical_Path;

               if Name_Buffer (Name_Len) /= Directory_Separator then
                  Add_Char_To_Name_Buffer (Directory_Separator);
               end if;

               Path.Name := Name_Find;
            end;
         end if;

         Free (Full_Path_Name);
      end;
   end Locate_Directory;

   ---------------------------
   -- Find_Excluded_Sources --
   ---------------------------

   procedure Find_Excluded_Sources
     (Project : in out Project_Processing_Data;
      Data    : in out Tree_Processing_Data)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Excluded_Source_List_File : constant Variable_Value :=
                                    Util.Value_Of
                                      (Name_Excluded_Source_List_File,
                                       Project.Project.Decl.Attributes,
                                       Shared);
      Excluded_Sources          : Variable_Value := Util.Value_Of
                                    (Name_Excluded_Source_Files,
                                     Project.Project.Decl.Attributes,
                                     Shared);

      Current         : String_List_Id;
      Element         : String_Element;
      Location        : Source_Ptr;
      Name            : File_Name_Type;
      File            : Prj.Util.Text_File;
      Line            : String (1 .. 300);
      Last            : Natural;
      Locally_Removed : Boolean := False;

   begin
      --  If Excluded_Source_Files is not declared, check Locally_Removed_Files

      if Excluded_Sources.Default then
         Locally_Removed := True;
         Excluded_Sources :=
           Util.Value_Of
             (Name_Locally_Removed_Files,
              Project.Project.Decl.Attributes, Shared);
      end if;

      --  If there are excluded sources, put them in the table

      if not Excluded_Sources.Default then
         if not Excluded_Source_List_File.Default then
            if Locally_Removed then
               Error_Msg
                 (Data.Flags,
                  "?both attributes Locally_Removed_Files and " &
                  "Excluded_Source_List_File are present",
                  Excluded_Source_List_File.Location, Project.Project);
            else
               Error_Msg
                 (Data.Flags,
                  "?both attributes Excluded_Source_Files and " &
                  "Excluded_Source_List_File are present",
                  Excluded_Source_List_File.Location, Project.Project);
            end if;
         end if;

         Current := Excluded_Sources.Values;
         while Current /= Nil_String loop
            Element := Shared.String_Elements.Table (Current);
            Name := Canonical_Case_File_Name (Element.Value);

            --  If the element has no location, then use the location of
            --  Excluded_Sources to report possible errors.

            if Element.Location = No_Location then
               Location := Excluded_Sources.Location;
            else
               Location := Element.Location;
            end if;

            Excluded_Sources_Htable.Set
              (Project.Excluded, Name,
               (Name, No_File, 0, False, Location));
            Current := Element.Next;
         end loop;

      elsif not Excluded_Source_List_File.Default then
         Location := Excluded_Source_List_File.Location;

         declare
            Source_File_Name : constant File_Name_Type :=
                                 File_Name_Type
                                    (Excluded_Source_List_File.Value);
            Source_File_Line : Natural := 0;

            Source_File_Path_Name : constant String :=
                                      Path_Name_Of
                                        (Source_File_Name,
                                         Project.Project.Directory.Name);

         begin
            if Source_File_Path_Name'Length = 0 then
               Err_Vars.Error_Msg_File_1 :=
                 File_Name_Type (Excluded_Source_List_File.Value);
               Error_Msg
                 (Data.Flags,
                  "file with excluded sources { does not exist",
                  Excluded_Source_List_File.Location, Project.Project);

            else
               --  Open the file

               Prj.Util.Open (File, Source_File_Path_Name);

               if not Prj.Util.Is_Valid (File) then
                  Error_Msg
                    (Data.Flags, "file does not exist",
                     Location, Project.Project);
               else
                  --  Read the lines one by one

                  while not Prj.Util.End_Of_File (File) loop
                     Prj.Util.Get_Line (File, Line, Last);
                     Source_File_Line := Source_File_Line + 1;

                     --  Non empty, non comment line should contain a file name

                     if Last /= 0
                       and then (Last = 1 or else Line (1 .. 2) /= "--")
                     then
                        Name_Len := Last;
                        Name_Buffer (1 .. Name_Len) := Line (1 .. Last);
                        Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
                        Name := Name_Find;

                        --  Check that there is no directory information

                        for J in 1 .. Last loop
                           if Line (J) = '/'
                             or else Line (J) = Directory_Separator
                           then
                              Error_Msg_File_1 := Name;
                              Error_Msg
                                (Data.Flags,
                                 "file name cannot include " &
                                 "directory information ({)",
                                 Location, Project.Project);
                              exit;
                           end if;
                        end loop;

                        Excluded_Sources_Htable.Set
                          (Project.Excluded,
                           Name,
                           (Name, Source_File_Name, Source_File_Line,
                            False, Location));
                     end if;
                  end loop;

                  Prj.Util.Close (File);
               end if;
            end if;
         end;
      end if;
   end Find_Excluded_Sources;

   ------------------
   -- Find_Sources --
   ------------------

   procedure Find_Sources
     (Project : in out Project_Processing_Data;
      Data    : in out Tree_Processing_Data)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Sources : constant Variable_Value :=
                  Util.Value_Of
                    (Name_Source_Files,
                     Project.Project.Decl.Attributes,
                     Shared);

      Source_List_File : constant Variable_Value :=
                           Util.Value_Of
                             (Name_Source_List_File,
                              Project.Project.Decl.Attributes,
                              Shared);

      Name_Loc             : Name_Location;
      Has_Explicit_Sources : Boolean;

   begin
      pragma Assert (Sources.Kind = List, "Source_Files is not a list");
      pragma Assert
        (Source_List_File.Kind = Single,
         "Source_List_File is not a single string");

      Project.Source_List_File_Location := Source_List_File.Location;

      --  If the user has specified a Source_Files attribute

      if not Sources.Default then
         if not Source_List_File.Default then
            Error_Msg
              (Data.Flags,
               "?both attributes source_files and " &
               "source_list_file are present",
               Source_List_File.Location, Project.Project);
         end if;

         --  Sources is a list of file names

         declare
            Current  : String_List_Id := Sources.Values;
            Element  : String_Element;
            Location : Source_Ptr;
            Name     : File_Name_Type;

         begin
            if Current = Nil_String then
               Project.Project.Languages := No_Language_Index;

               --  This project contains no source. For projects that don't
               --  extend other projects, this also means that there is no
               --  need for an object directory, if not specified.

               if Project.Project.Extends = No_Project
                 and then
                   Project.Project.Object_Directory = Project.Project.Directory
                 and then
                   not (Project.Project.Qualifier = Aggregate_Library)
               then
                  Project.Project.Object_Directory := No_Path_Information;
               end if;
            end if;

            while Current /= Nil_String loop
               Element := Shared.String_Elements.Table (Current);
               Name := Canonical_Case_File_Name (Element.Value);
               Get_Name_String (Element.Value);

               --  If the element has no location, then use the location of
               --  Sources to report possible errors.

               if Element.Location = No_Location then
                  Location := Sources.Location;
               else
                  Location := Element.Location;
               end if;

               --  Check that there is no directory information

               for J in 1 .. Name_Len loop
                  if Name_Buffer (J) = '/'
                    or else Name_Buffer (J) = Directory_Separator
                  then
                     Error_Msg_File_1 := Name;
                     Error_Msg
                       (Data.Flags,
                        "file name cannot include directory " &
                        "information ({)",
                        Location, Project.Project);
                     exit;
                  end if;
               end loop;

               --  Check whether the file is already there: the same file name
               --  may be in the list. If the source is missing, the error will
               --  be on the first mention of the source file name.

               Name_Loc := Source_Names_Htable.Get
                 (Project.Source_Names, Name);

               if Name_Loc = No_Name_Location then
                  Name_Loc :=
                    (Name     => Name,
                     Location => Location,
                     Source   => No_Source,
                     Listed   => True,
                     Found    => False);

               else
                  Name_Loc.Listed := True;
               end if;

               Source_Names_Htable.Set
                 (Project.Source_Names, Name, Name_Loc);

               Current := Element.Next;
            end loop;

            Has_Explicit_Sources := True;
         end;

         --  If we have no Source_Files attribute, check the Source_List_File
         --  attribute.

      elsif not Source_List_File.Default then

         --  Source_List_File is the name of the file that contains the source
         --  file names.

         declare
            Source_File_Path_Name : constant String :=
                                      Path_Name_Of
                                        (File_Name_Type
                                           (Source_List_File.Value),
                                         Project.Project.
                                           Directory.Display_Name);

         begin
            Has_Explicit_Sources := True;

            if Source_File_Path_Name'Length = 0 then
               Err_Vars.Error_Msg_File_1 :=
                 File_Name_Type (Source_List_File.Value);
               Error_Msg
                 (Data.Flags,
                  "file with sources { does not exist",
                  Source_List_File.Location, Project.Project);

            else
               Get_Sources_From_File
                 (Source_File_Path_Name, Source_List_File.Location,
                  Project, Data);
            end if;
         end;

      else
         --  Neither Source_Files nor Source_List_File has been specified. Find
         --  all the files that satisfy the naming scheme in all the source
         --  directories.

         Has_Explicit_Sources := False;
      end if;

      --  Remove any exception that is not in the specified list of sources

      if Has_Explicit_Sources then
         declare
            Source : Source_Id;
            Iter   : Source_Iterator;
            NL     : Name_Location;
            Again  : Boolean;
         begin
            Iter_Loop :
            loop
               Again := False;
               Iter := For_Each_Source (Data.Tree, Project.Project);

               Source_Loop :
               loop
                  Source := Prj.Element (Iter);
                  exit Source_Loop when Source = No_Source;

                  if Source.Naming_Exception /= No then
                     NL := Source_Names_Htable.Get
                       (Project.Source_Names, Source.File);

                     if NL /= No_Name_Location and then not NL.Listed then
                        --  Remove the exception
                        Source_Names_Htable.Set
                          (Project.Source_Names,
                           Source.File,
                           No_Name_Location);
                        Remove_Source (Data.Tree, Source, No_Source);

                        if Source.Naming_Exception = Yes then
                           Error_Msg_Name_1 := Name_Id (Source.File);
                           Error_Msg
                             (Data.Flags,
                              "? unknown source file %%",
                              NL.Location,
                              Project.Project);
                        end if;

                        Again := True;
                        exit Source_Loop;
                     end if;
                  end if;

                  Next (Iter);
               end loop Source_Loop;

               exit Iter_Loop when not Again;
            end loop Iter_Loop;
         end;
      end if;

      Search_Directories
        (Project,
         Data            => Data,
         For_All_Sources => Sources.Default and then Source_List_File.Default);

      --  Check if all exceptions have been found

      declare
         Source : Source_Id;
         Iter   : Source_Iterator;
         Found  : Boolean := False;

      begin
         Iter := For_Each_Source (Data.Tree, Project.Project);
         loop
            Source := Prj.Element (Iter);
            exit when Source = No_Source;

            --  If the full source path is unknown for this source_id, there
            --  could be several reasons:
            --    * we simply did not find the file itself, this is an error
            --    * we have a multi-unit source file. Another Source_Id from
            --      the same file has received the full path, so we need to
            --      propagate it.

            if Source.Path = No_Path_Information then
               if Source.Naming_Exception = Yes then
                  if Source.Unit /= No_Unit_Index then
                     Found := False;

                     if Source.Index /= 0 then  --  Only multi-unit files
                        declare
                           S : Source_Id :=
                                 Source_Files_Htable.Get
                                   (Data.Tree.Source_Files_HT, Source.File);

                        begin
                           while S /= null loop
                              if S.Path /= No_Path_Information then
                                 Source.Path := S.Path;
                                 Found := True;

                                 if Current_Verbosity = High then
                                    Debug_Output
                                      ("setting full path for "
                                       & Get_Name_String (Source.File)
                                       & " at" & Source.Index'Img
                                       & " to "
                                       & Get_Name_String (Source.Path.Name));
                                 end if;

                                 exit;
                              end if;

                              S := S.Next_With_File_Name;
                           end loop;
                        end;
                     end if;

                     if not Found then
                        Error_Msg_Name_1 := Name_Id (Source.Display_File);
                        Error_Msg_Name_2 := Source.Unit.Name;
                        Error_Or_Warning
                          (Data.Flags, Data.Flags.Missing_Source_Files,
                           "source file %% for unit %% not found",
                           No_Location, Project.Project);
                     end if;
                  end if;

                  if Source.Path = No_Path_Information then
                     Remove_Source (Data.Tree, Source, No_Source);
                  end if;

               elsif Source.Naming_Exception = Inherited then
                  Remove_Source (Data.Tree, Source, No_Source);
               end if;
            end if;

            Next (Iter);
         end loop;
      end;

      --  It is an error if a source file name in a source list or in a source
      --  list file is not found.

      if Has_Explicit_Sources then
         declare
            NL          : Name_Location;
            First_Error : Boolean;

         begin
            NL := Source_Names_Htable.Get_First (Project.Source_Names);
            First_Error := True;
            while NL /= No_Name_Location loop
               if not NL.Found then
                  Err_Vars.Error_Msg_File_1 := NL.Name;
                  if First_Error then
                     Error_Or_Warning
                       (Data.Flags, Data.Flags.Missing_Source_Files,
                        "source file { not found",
                        NL.Location, Project.Project);
                     First_Error := False;
                  else
                     Error_Or_Warning
                       (Data.Flags, Data.Flags.Missing_Source_Files,
                        "\source file { not found",
                        NL.Location, Project.Project);
                  end if;
               end if;

               NL := Source_Names_Htable.Get_Next (Project.Source_Names);
            end loop;
         end;
      end if;
   end Find_Sources;

   ----------------
   -- Initialize --
   ----------------

   procedure Initialize
     (Data      : out Tree_Processing_Data;
      Tree      : Project_Tree_Ref;
      Node_Tree : Prj.Tree.Project_Node_Tree_Ref;
      Flags     : Prj.Processing_Flags)
   is
   begin
      Data.Tree      := Tree;
      Data.Node_Tree := Node_Tree;
      Data.Flags     := Flags;
   end Initialize;

   ----------
   -- Free --
   ----------

   procedure Free (Data : in out Tree_Processing_Data) is
      pragma Unreferenced (Data);
   begin
      null;
   end Free;

   ----------------
   -- Initialize --
   ----------------

   procedure Initialize
     (Data    : in out Project_Processing_Data;
      Project : Project_Id)
   is
   begin
      Data.Project := Project;
   end Initialize;

   ----------
   -- Free --
   ----------

   procedure Free (Data : in out Project_Processing_Data) is
   begin
      Source_Names_Htable.Reset     (Data.Source_Names);
      Unit_Exceptions_Htable.Reset  (Data.Unit_Exceptions);
      Excluded_Sources_Htable.Reset (Data.Excluded);
   end Free;

   -------------------------------
   -- Check_File_Naming_Schemes --
   -------------------------------

   procedure Check_File_Naming_Schemes
     (Project               : Project_Processing_Data;
      File_Name             : File_Name_Type;
      Alternate_Languages   : out Language_List;
      Language              : out Language_Ptr;
      Display_Language_Name : out Name_Id;
      Unit                  : out Name_Id;
      Lang_Kind             : out Language_Kind;
      Kind                  : out Source_Kind)
   is
      Filename : constant String := Get_Name_String (File_Name);
      Config   : Language_Config;
      Tmp_Lang : Language_Ptr;

      Header_File : Boolean := False;
      --  True if we found at least one language for which the file is a header
      --  In such a case, we search for all possible languages where this is
      --  also a header (C and C++ for instance), since the file might be used
      --  for several such languages.

      procedure Check_File_Based_Lang;
      --  Does the naming scheme test for file-based languages. For those,
      --  there is no Unit. Just check if the file name has the implementation
      --  or, if it is specified, the template suffix of the language.
      --
      --  Returns True if the file belongs to the current language and we
      --  should stop searching for matching languages. Not that a given header
      --  file could belong to several languages (C and C++ for instance). Thus
      --  if we found a header we'll check whether it matches other languages.

      ---------------------------
      -- Check_File_Based_Lang --
      ---------------------------

      procedure Check_File_Based_Lang is
      begin
         if not Header_File
           and then Suffix_Matches (Filename, Config.Naming_Data.Body_Suffix)
         then
            Unit     := No_Name;
            Kind     := Impl;
            Language := Tmp_Lang;

            Debug_Output
              ("implementation of language ", Display_Language_Name);

         elsif Suffix_Matches (Filename, Config.Naming_Data.Spec_Suffix) then
            Debug_Output
              ("header of language ", Display_Language_Name);

            if Header_File then
               Alternate_Languages := new Language_List_Element'
                 (Language => Language,
                  Next     => Alternate_Languages);

            else
               Header_File := True;
               Kind        := Spec;
               Unit        := No_Name;
               Language    := Tmp_Lang;
            end if;
         end if;
      end Check_File_Based_Lang;

   --  Start of processing for Check_File_Naming_Schemes

   begin
      Language              := No_Language_Index;
      Alternate_Languages   := null;
      Display_Language_Name := No_Name;
      Unit                  := No_Name;
      Lang_Kind             := File_Based;
      Kind                  := Spec;

      Tmp_Lang := Project.Project.Languages;
      while Tmp_Lang /= No_Language_Index loop
         if Current_Verbosity = High then
            Debug_Output
              ("testing language "
               & Get_Name_String (Tmp_Lang.Name)
               & " Header_File=" & Header_File'Img);
         end if;

         Display_Language_Name := Tmp_Lang.Display_Name;
         Config := Tmp_Lang.Config;
         Lang_Kind := Config.Kind;

         case Config.Kind is
            when File_Based =>
               Check_File_Based_Lang;
               exit when Kind = Impl;

            when Unit_Based =>

               --  We know it belongs to a least a file_based language, no
               --  need to check unit-based ones.

               if not Header_File then
                  Compute_Unit_Name
                    (File_Name => File_Name,
                     Naming    => Config.Naming_Data,
                     Kind      => Kind,
                     Unit      => Unit,
                     Project   => Project);

                  if Unit /= No_Name then
                     Language    := Tmp_Lang;
                     exit;
                  end if;
               end if;
         end case;

         Tmp_Lang := Tmp_Lang.Next;
      end loop;

      if Language = No_Language_Index then
         Debug_Output ("not a source of any language");
      end if;
   end Check_File_Naming_Schemes;

   -------------------
   -- Override_Kind --
   -------------------

   procedure Override_Kind (Source : Source_Id; Kind : Source_Kind) is
   begin
      --  If the file was previously already associated with a unit, change it

      if Source.Unit /= null
        and then Source.Kind in Spec_Or_Body
        and then Source.Unit.File_Names (Source.Kind) /= null
      then
         --  If we had another file referencing the same unit (for instance it
         --  was in an extended project), that source file is in fact invisible
         --  from now on, and in particular doesn't belong to the same unit.
         --  If the source is an inherited naming exception, then it may not
         --  really exist: the source potentially replaced is left untouched.

         if Source.Unit.File_Names (Source.Kind) /= Source then
            Source.Unit.File_Names (Source.Kind).Unit := No_Unit_Index;
         end if;

         Source.Unit.File_Names (Source.Kind) := null;
      end if;

      Source.Kind := Kind;

      if Current_Verbosity = High
        and then Source.File /= No_File
      then
         Debug_Output ("override kind for "
                       & Get_Name_String (Source.File)
                       & " idx=" & Source.Index'Img
                       & " kind=" & Source.Kind'Img);
      end if;

      if Source.Unit /= null then
         if Source.Kind = Spec then
            Source.Unit.File_Names (Spec) := Source;
         else
            Source.Unit.File_Names (Impl) := Source;
         end if;
      end if;
   end Override_Kind;

   ----------------
   -- Check_File --
   ----------------

   procedure Check_File
     (Project           : in out Project_Processing_Data;
      Data              : in out Tree_Processing_Data;
      Source_Dir_Rank   : Natural;
      Path              : Path_Name_Type;
      Display_Path      : Path_Name_Type;
      File_Name         : File_Name_Type;
      Display_File_Name : File_Name_Type;
      Locally_Removed   : Boolean;
      For_All_Sources   : Boolean)
   is
      Name_Loc              : Name_Location :=
                                Source_Names_Htable.Get
                                  (Project.Source_Names, File_Name);
      Check_Name            : Boolean := False;
      Alternate_Languages   : Language_List;
      Language              : Language_Ptr;
      Source                : Source_Id;
      Src_Ind               : Source_File_Index;
      Unit                  : Name_Id;
      Display_Language_Name : Name_Id;
      Lang_Kind             : Language_Kind;
      Kind                  : Source_Kind := Spec;

   begin
      if Current_Verbosity = High then
         Debug_Increase_Indent
           ("checking file (rank=" & Source_Dir_Rank'Img & ")",
            Name_Id (Display_Path));
      end if;

      if Name_Loc = No_Name_Location then
         Check_Name := For_All_Sources;

      else
         if Name_Loc.Found then

            --  Check if it is OK to have the same file name in several
            --  source directories.

            if Name_Loc.Source /= No_Source
              and then Source_Dir_Rank = Name_Loc.Source.Source_Dir_Rank
            then
               Error_Msg_File_1 := File_Name;
               Error_Msg
                 (Data.Flags,
                  "{ is found in several source directories",
                  Name_Loc.Location, Project.Project);
            end if;

         else
            Name_Loc.Found := True;

            Source_Names_Htable.Set
              (Project.Source_Names, File_Name, Name_Loc);

            if Name_Loc.Source = No_Source then
               Check_Name := True;

            else
               --  Set the full path for the source_id (which might have been
               --  created when parsing the naming exceptions, and therefore
               --  might not have the full path).
               --  We only set this for this source_id, but not for other
               --  source_id in the same file (case of multi-unit source files)
               --  For the latter, they will be set in Find_Sources when we
               --  check that all source_id have known full paths.
               --  Doing this later saves one htable lookup per file in the
               --  common case where the user is not using multi-unit files.

               Name_Loc.Source.Path := (Path, Display_Path);

               Source_Paths_Htable.Set
                 (Data.Tree.Source_Paths_HT, Path, Name_Loc.Source);

               --  Check if this is a subunit

               if Name_Loc.Source.Unit /= No_Unit_Index
                 and then Name_Loc.Source.Kind = Impl
               then
                  Src_Ind := Sinput.P.Load_Project_File
                    (Get_Name_String (Display_Path));

                  if Sinput.P.Source_File_Is_Subunit (Src_Ind) then
                     Override_Kind (Name_Loc.Source, Sep);
                  end if;
               end if;

               --  If this is an inherited naming exception, make sure that
               --  the naming exception it replaces is no longer a source.

               if Name_Loc.Source.Naming_Exception = Inherited then
                  declare
                     Proj : Project_Id := Name_Loc.Source.Project.Extends;
                     Iter : Source_Iterator;
                     Src  : Source_Id;
                  begin
                     while Proj /= No_Project loop
                        Iter := For_Each_Source (Data.Tree, Proj);
                        Src := Prj.Element (Iter);
                        while Src /= No_Source loop
                           if Src.File = Name_Loc.Source.File then
                              Src.Replaced_By := Name_Loc.Source;
                              exit;
                           end if;

                           Next (Iter);
                           Src := Prj.Element (Iter);
                        end loop;

                        Proj := Proj.Extends;
                     end loop;
                  end;

                  if Name_Loc.Source.Unit /= No_Unit_Index then
                     if Name_Loc.Source.Kind = Spec then
                        Name_Loc.Source.Unit.File_Names (Spec) :=
                          Name_Loc.Source;

                     elsif Name_Loc.Source.Kind = Impl then
                        Name_Loc.Source.Unit.File_Names (Impl) :=
                          Name_Loc.Source;
                     end if;

                     Units_Htable.Set
                       (Data.Tree.Units_HT,
                        Name_Loc.Source.Unit.Name,
                        Name_Loc.Source.Unit);
                  end if;
               end if;
            end if;
         end if;
      end if;

      if Check_Name then
         Check_File_Naming_Schemes
           (Project               => Project,
            File_Name             => File_Name,
            Alternate_Languages   => Alternate_Languages,
            Language              => Language,
            Display_Language_Name => Display_Language_Name,
            Unit                  => Unit,
            Lang_Kind             => Lang_Kind,
            Kind                  => Kind);

         if Language = No_Language_Index then

            --  A file name in a list must be a source of a language

            if Data.Flags.Error_On_Unknown_Language
              and then Name_Loc.Found
            then
               Error_Msg_File_1 := File_Name;
               Error_Msg
                 (Data.Flags,
                  "language unknown for {",
                  Name_Loc.Location, Project.Project);
            end if;

         else
            Add_Source
              (Id                  => Source,
               Project             => Project.Project,
               Source_Dir_Rank     => Source_Dir_Rank,
               Lang_Id             => Language,
               Kind                => Kind,
               Data                => Data,
               Alternate_Languages => Alternate_Languages,
               File_Name           => File_Name,
               Display_File        => Display_File_Name,
               Unit                => Unit,
               Locally_Removed     => Locally_Removed,
               Path                => (Path, Display_Path));

            --  If it is a source specified in a list, update the entry in
            --  the Source_Names table.

            if Name_Loc.Found and then Name_Loc.Source = No_Source then
               Name_Loc.Source := Source;
               Source_Names_Htable.Set
                 (Project.Source_Names, File_Name, Name_Loc);
            end if;
         end if;
      end if;

      Debug_Decrease_Indent;
   end Check_File;

   ---------------------------------
   -- Expand_Subdirectory_Pattern --
   ---------------------------------

   procedure Expand_Subdirectory_Pattern
     (Project       : Project_Id;
      Data          : in out Tree_Processing_Data;
      Patterns      : String_List_Id;
      Ignore        : String_List_Id;
      Search_For    : Search_Type;
      Resolve_Links : Boolean)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      package Recursive_Dirs is new GNAT.Dynamic_HTables.Simple_HTable
        (Header_Num => Header_Num,
         Element    => Boolean,
         No_Element => False,
         Key        => Path_Name_Type,
         Hash       => Hash,
         Equal      => "=");
      --  Hash table stores recursive source directories, to avoid looking
      --  several times, and to avoid cycles that may be introduced by symbolic
      --  links.

      File_Pattern : GNAT.Regexp.Regexp;
      --  Pattern to use when matching file names

      Visited : Recursive_Dirs.Instance;

      procedure Find_Pattern
        (Pattern_Id : Name_Id;
         Rank       : Natural;
         Location   : Source_Ptr);
      --  Find a specific pattern

      function Recursive_Find_Dirs
        (Path : Path_Information;
         Rank : Natural) return Boolean;
      --  Search all the subdirectories (recursively) of Path.
      --  Return True if at least one file or directory was processed

      function Subdirectory_Matches
        (Path : Path_Information;
         Rank : Natural) return Boolean;
      --  Called when a matching directory was found. If the user is in fact
      --  searching for files, we then search for those files matching the
      --  pattern within the directory.
      --  Return True if at least one file or directory was processed

      --------------------------
      -- Subdirectory_Matches --
      --------------------------

      function Subdirectory_Matches
        (Path : Path_Information;
         Rank : Natural) return Boolean
      is
         Dir     : Dir_Type;
         Name    : String (1 .. 250);
         Last    : Natural;
         Found   : Path_Information;
         Success : Boolean := False;

      begin
         case Search_For is
            when Search_Directories =>
               Callback (Path, Rank);
               return True;

            when Search_Files =>
               Open (Dir, Get_Name_String (Path.Display_Name));
               loop
                  Read (Dir, Name, Last);
                  exit when Last = 0;

                  if Name (Name'First .. Last) /= "."
                    and then Name (Name'First .. Last) /= ".."
                    and then Match (Name (Name'First .. Last), File_Pattern)
                  then
                     Get_Name_String (Path.Display_Name);
                     Add_Str_To_Name_Buffer (Name (Name'First .. Last));

                     Found.Display_Name := Name_Find;
                     Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
                     Found.Name := Name_Find;

                     Callback (Found, Rank);
                     Success := True;
                  end if;
               end loop;

               Close (Dir);

               return Success;
         end case;
      end Subdirectory_Matches;

      -------------------------
      -- Recursive_Find_Dirs --
      -------------------------

      function Recursive_Find_Dirs
        (Path : Path_Information;
         Rank : Natural) return Boolean
      is
         Path_Str : constant String := Get_Name_String (Path.Display_Name);
         Dir      : Dir_Type;
         Name     : String (1 .. 250);
         Last     : Natural;
         Success  : Boolean := False;

      begin
         Debug_Output ("looking for subdirs of ", Name_Id (Path.Display_Name));

         if Recursive_Dirs.Get (Visited, Path.Name) then
            return Success;
         end if;

         Recursive_Dirs.Set (Visited, Path.Name, True);

         Success := Subdirectory_Matches (Path, Rank) or Success;

         Open (Dir, Path_Str);

         loop
            Read (Dir, Name, Last);
            exit when Last = 0;

            if Name (1 .. Last) /= "."
                 and then
               Name (1 .. Last) /= ".."
            then
               declare
                  Path_Name : constant String :=
                    Normalize_Pathname
                      (Name           => Name (1 .. Last),
                       Directory      => Path_Str,
                       Resolve_Links  => Resolve_Links)
                    & Directory_Separator;
                  Path2     : Path_Information;
                  OK        : Boolean := True;

               begin
                  if Is_Directory (Path_Name) then
                     if Ignore /= Nil_String then
                        declare
                           Dir_Name : String := Name (1 .. Last);
                           List     : String_List_Id := Ignore;

                        begin
                           Canonical_Case_File_Name (Dir_Name);

                           while List /= Nil_String loop
                              Get_Name_String
                                (Shared.String_Elements.Table (List).Value);
                              Canonical_Case_File_Name
                                (Name_Buffer (1 .. Name_Len));
                              OK := Name_Buffer (1 .. Name_Len) /= Dir_Name;
                              exit when not OK;
                              List := Shared.String_Elements.Table (List).Next;
                           end loop;
                        end;
                     end if;

                     if OK then
                        Name_Len := 0;
                        Add_Str_To_Name_Buffer (Path_Name);
                        Path2.Display_Name := Name_Find;

                        Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
                        Path2.Name := Name_Find;

                        Success :=
                          Recursive_Find_Dirs (Path2, Rank) or Success;
                     end if;
                  end if;
               end;
            end if;
         end loop;

         Close (Dir);

         return Success;

      exception
         when Directory_Error =>
            return Success;
      end Recursive_Find_Dirs;

      ------------------
      -- Find_Pattern --
      ------------------

      procedure Find_Pattern
        (Pattern_Id : Name_Id;
         Rank       : Natural;
         Location   : Source_Ptr)
      is
         Pattern     : constant String := Get_Name_String (Pattern_Id);
         Pattern_End : Natural := Pattern'Last;
         Recursive   : Boolean;
         Dir         : File_Name_Type;
         Path_Name   : Path_Information;
         Dir_Exists  : Boolean;
         Has_Error   : Boolean := False;
         Success     : Boolean;

      begin
         Debug_Increase_Indent ("Find_Pattern", Pattern_Id);

         --  If we are looking for files, find the pattern for the files

         if Search_For = Search_Files then
            while Pattern_End >= Pattern'First
              and then Pattern (Pattern_End) /= '/'
              and then Pattern (Pattern_End) /= Directory_Separator
            loop
               Pattern_End := Pattern_End - 1;
            end loop;

            if Pattern_End = Pattern'Last then
               Err_Vars.Error_Msg_File_1 := File_Name_Type (Pattern_Id);
               Error_Or_Warning
                 (Data.Flags, Data.Flags.Missing_Source_Files,
                  "Missing file name or pattern in {", Location, Project);
               return;
            end if;

            if Current_Verbosity = High then
               Debug_Indent;
               Write_Str ("file_pattern=");
               Write_Str (Pattern (Pattern_End + 1 .. Pattern'Last));
               Write_Str (" dir_pattern=");
               Write_Line (Pattern (Pattern'First .. Pattern_End));
            end if;

            File_Pattern := Compile
              (Pattern (Pattern_End + 1 .. Pattern'Last),
               Glob           => True,
               Case_Sensitive => File_Names_Case_Sensitive);

            --  If we had just "*.gpr", this is equivalent to "./*.gpr"

            if Pattern_End > Pattern'First then
               Pattern_End := Pattern_End - 1; --  Skip directory separator
            end if;
         end if;

         Recursive :=
           Pattern_End - 1 >= Pattern'First
           and then Pattern (Pattern_End - 1 .. Pattern_End) = "**"
           and then (Pattern_End - 1 = Pattern'First
                     or else Pattern (Pattern_End - 2) = '/'
                     or else Pattern (Pattern_End - 2) = Directory_Separator);

         if Recursive then
            Pattern_End := Pattern_End - 2;
            if Pattern_End > Pattern'First then
               Pattern_End := Pattern_End - 1; --  Skip '/'
            end if;
         end if;

         Name_Len := Pattern_End - Pattern'First + 1;
         Name_Buffer (1 .. Name_Len) := Pattern (Pattern'First .. Pattern_End);
         Dir := Name_Find;

         Locate_Directory
           (Project     => Project,
            Name        => Dir,
            Path        => Path_Name,
            Dir_Exists  => Dir_Exists,
            Data        => Data,
            Must_Exist  => False);

         if not Dir_Exists then
            Err_Vars.Error_Msg_File_1 := Dir;
            Error_Or_Warning
              (Data.Flags, Data.Flags.Missing_Source_Files,
               "{ is not a valid directory", Location, Project);
            Has_Error := Data.Flags.Missing_Source_Files = Error;
         end if;

         if not Has_Error then

            --  Links have been resolved if necessary, and Path_Name
            --  always ends with a directory separator.

            if Recursive then
               Success := Recursive_Find_Dirs (Path_Name, Rank);
            else
               Success := Subdirectory_Matches (Path_Name, Rank);
            end if;

            if not Success then
               case Search_For is
                  when Search_Directories =>
                     null;  --  Error can't occur

                  when Search_Files =>
                     Err_Vars.Error_Msg_File_1 := File_Name_Type (Pattern_Id);
                     Error_Or_Warning
                       (Data.Flags, Data.Flags.Missing_Source_Files,
                        "file { not found", Location, Project);
               end case;
            end if;
         end if;

         Debug_Decrease_Indent ("done Find_Pattern");
      end Find_Pattern;

      --  Local variables

      Pattern_Id : String_List_Id := Patterns;
      Element    : String_Element;
      Rank       : Natural := 1;

   --  Start of processing for Expand_Subdirectory_Pattern

   begin
      while Pattern_Id /= Nil_String loop
         Element := Shared.String_Elements.Table (Pattern_Id);
         Find_Pattern (Element.Value, Rank, Element.Location);
         Rank := Rank + 1;
         Pattern_Id := Element.Next;
      end loop;

      Recursive_Dirs.Reset (Visited);
   end Expand_Subdirectory_Pattern;

   ------------------------
   -- Search_Directories --
   ------------------------

   procedure Search_Directories
     (Project         : in out Project_Processing_Data;
      Data            : in out Tree_Processing_Data;
      For_All_Sources : Boolean)
   is
      Shared : constant Shared_Project_Tree_Data_Access := Data.Tree.Shared;

      Source_Dir        : String_List_Id;
      Element           : String_Element;
      Src_Dir_Rank      : Number_List_Index;
      Num_Nod           : Number_Node;
      Dir               : Dir_Type;
      Name              : String (1 .. 1_000);
      Last              : Natural;
      File_Name         : File_Name_Type;
      Display_File_Name : File_Name_Type;

   begin
      Debug_Increase_Indent ("looking for sources of", Project.Project.Name);

      --  Loop through subdirectories

      Src_Dir_Rank := Project.Project.Source_Dir_Ranks;

      Source_Dir := Project.Project.Source_Dirs;
      while Source_Dir /= Nil_String loop
         begin
            Num_Nod := Shared.Number_Lists.Table (Src_Dir_Rank);
            Element := Shared.String_Elements.Table (Source_Dir);

            --  Use Element.Value in this test, not Display_Value, because we
            --  want the symbolic links to be resolved when appropriate.

            if Element.Value /= No_Name then
               declare
                  Source_Directory : constant String :=
                                       Get_Name_String (Element.Value)
                                         & Directory_Separator;

                  Dir_Last : constant Natural :=
                               Compute_Directory_Last (Source_Directory);

                  Display_Source_Directory : constant String :=
                                               Get_Name_String
                                                 (Element.Display_Value)
                                                  & Directory_Separator;
                  --  Display_Source_Directory is to allow us to open a UTF-8
                  --  encoded directory on Windows.

               begin
                  if Current_Verbosity = High then
                     Debug_Increase_Indent
                       ("Source_Dir (node=" & Num_Nod.Number'Img & ") """
                        & Source_Directory (Source_Directory'First .. Dir_Last)
                        & '"');
                  end if;

                  --  We look to every entry in the source directory

                  Open (Dir, Display_Source_Directory);

                  loop
                     Read (Dir, Name, Last);
                     exit when Last = 0;

                     --  In fast project loading mode (without -eL), the user
                     --  guarantees that no directory has a name which is a
                     --  valid source name, so we can avoid doing a system call
                     --  here. This provides a very significant speed up on
                     --  slow file systems (remote files for instance).

                     if not Opt.Follow_Links_For_Files
                       or else Is_Regular_File
                                 (Display_Source_Directory & Name (1 .. Last))
                     then
                        Name_Len := Last;
                        Name_Buffer (1 .. Name_Len) := Name (1 .. Last);
                        Display_File_Name := Name_Find;

                        if Osint.File_Names_Case_Sensitive then
                           File_Name := Display_File_Name;
                        else
                           Canonical_Case_File_Name
                             (Name_Buffer (1 .. Name_Len));
                           File_Name := Name_Find;
                        end if;

                        declare
                           Path_Name : constant String :=
                                         Normalize_Pathname
                                           (Name (1 .. Last),
                                            Directory       =>
                                              Source_Directory
                                                (Source_Directory'First ..
                                                 Dir_Last),
                                            Resolve_Links   =>
                                              Opt.Follow_Links_For_Files,
                                            Case_Sensitive => True);

                           Path      : Path_Name_Type;
                           FF        : File_Found :=
                                         Excluded_Sources_Htable.Get
                                           (Project.Excluded, File_Name);
                           To_Remove : Boolean := False;

                        begin
                           Name_Len := Path_Name'Length;
                           Name_Buffer (1 .. Name_Len) := Path_Name;

                           if Osint.File_Names_Case_Sensitive then
                              Path := Name_Find;
                           else
                              Canonical_Case_File_Name
                                (Name_Buffer (1 .. Name_Len));
                              Path := Name_Find;
                           end if;

                           if FF /= No_File_Found then
                              if not FF.Found then
                                 FF.Found := True;
                                 Excluded_Sources_Htable.Set
                                   (Project.Excluded, File_Name, FF);

                                 Debug_Output
                                   ("excluded source ",
                                    Name_Id (Display_File_Name));

                                 --  Will mark the file as removed, but we
                                 --  still need to add it to the list: if we
                                 --  don't, the file will not appear in the
                                 --  mapping file and will cause the compiler
                                 --  to fail.

                                 To_Remove := True;
                              end if;
                           end if;

                           --  Preserve the user's original casing and use of
                           --  links. The display_value (a directory) already
                           --  ends with a directory separator by construction,
                           --  so no need to add one.

                           Get_Name_String (Element.Display_Value);
                           Get_Name_String_And_Append (Display_File_Name);

                           Check_File
                             (Project           => Project,
                              Source_Dir_Rank   => Num_Nod.Number,
                              Data              => Data,
                              Path              => Path,
                              Display_Path      => Name_Find,
                              File_Name         => File_Name,
                              Locally_Removed   => To_Remove,
                              Display_File_Name => Display_File_Name,
                              For_All_Sources   => For_All_Sources);
                        end;

                     else
                        if Current_Verbosity = High then
                           Debug_Output ("ignore " & Name (1 .. Last));
                        end if;
                     end if;
                  end loop;

                  Debug_Decrease_Indent;
                  Close (Dir);
               end;
            end if;

         exception
            when Directory_Error =>
               null;
         end;

         Source_Dir := Element.Next;
         Src_Dir_Rank := Num_Nod.Next;
      end loop;

      Debug_Decrease_Indent ("end looking for sources.");
   end Search_Directories;

   ----------------------------
   -- Load_Naming_Exceptions --
   ----------------------------

   procedure Load_Naming_Exceptions
     (Project : in out Project_Processing_Data;
      Data    : in out Tree_Processing_Data)
   is
      Source : Source_Id;
      Iter   : Source_Iterator;

   begin
      Iter := For_Each_Source (Data.Tree, Project.Project);
      loop
         Source := Prj.Element (Iter);
         exit when Source = No_Source;

         --  An excluded file cannot also be an exception file name

         if Excluded_Sources_Htable.Get (Project.Excluded, Source.File) /=
                                                                 No_File_Found
         then
            Error_Msg_File_1 := Source.File;
            Error_Msg
              (Data.Flags,
               "{ cannot be both excluded and an exception file name",
               No_Location, Project.Project);
         end if;

         Debug_Output
           ("naming exception: adding source file to source_Names: ",
            Name_Id (Source.File));

         Source_Names_Htable.Set
           (Project.Source_Names,
            K => Source.File,
            E => Name_Location'
                  (Name     => Source.File,
                   Location => Source.Location,
                   Source   => Source,
                   Listed   => False,
                   Found    => False));

         --  If this is an Ada exception, record in table Unit_Exceptions

         if Source.Unit /= No_Unit_Index then
            declare
               Unit_Except : Unit_Exception :=
                               Unit_Exceptions_Htable.Get
                                 (Project.Unit_Exceptions, Source.Unit.Name);

            begin
               Unit_Except.Name := Source.Unit.Name;

               if Source.Kind = Spec then
                  Unit_Except.Spec := Source.File;
               else
                  Unit_Except.Impl := Source.File;
               end if;

               Unit_Exceptions_Htable.Set
                 (Project.Unit_Exceptions, Source.Unit.Name, Unit_Except);
            end;
         end if;

         Next (Iter);
      end loop;
   end Load_Naming_Exceptions;

   ----------------------
   -- Look_For_Sources --
   ----------------------

   procedure Look_For_Sources
     (Project : in out Project_Processing_Data;
      Data    : in out Tree_Processing_Data)
   is
      Object_Files : Object_File_Names_Htable.Instance;
      Iter         : Source_Iterator;
      Src          : Source_Id;

      procedure Check_Object (Src : Source_Id);
      --  Check if object file name of Src is already used in the project tree,
      --  and report an error if so.

      procedure Check_Object_Files;
      --  Check that no two sources of this project have the same object file

      procedure Mark_Excluded_Sources;
      --  Mark as such the sources that are declared as excluded

      procedure Check_Missing_Sources;
      --  Check whether one of the languages has no sources, and report an
      --  error when appropriate

      procedure Get_Sources_From_Source_Info;
      --  Get the source information from the tables that were created when a
      --  source info file was read.

      ---------------------------
      -- Check_Missing_Sources --
      ---------------------------

      procedure Check_Missing_Sources is
         Extending    : constant Boolean :=
                          Project.Project.Extends /= No_Project;
         Language     : Language_Ptr;
         Source       : Source_Id;
         Alt_Lang     : Language_List;
         Continuation : Boolean := False;
         Iter         : Source_Iterator;
      begin
         if not Project.Project.Externally_Built
           and then not Extending
         then
            Language := Project.Project.Languages;
            while Language /= No_Language_Index loop

               --  If there are no sources for this language, check if there
               --  are sources for which this is an alternate language.

               if Language.First_Source = No_Source
                 and then (Data.Flags.Require_Sources_Other_Lang
                            or else Language.Name = Name_Ada)
               then
                  Iter := For_Each_Source (In_Tree => Data.Tree,
                                           Project => Project.Project);
                  Source_Loop : loop
                     Source := Element (Iter);
                     exit Source_Loop when Source = No_Source
                       or else Source.Language = Language;

                     Alt_Lang := Source.Alternate_Languages;
                     while Alt_Lang /= null loop
                        exit Source_Loop when Alt_Lang.Language = Language;
                        Alt_Lang := Alt_Lang.Next;
                     end loop;

                     Next (Iter);
                  end loop Source_Loop;

                  if Source = No_Source then
                     Report_No_Sources
                       (Project.Project,
                        Get_Name_String (Language.Display_Name),
                        Data,
                        Project.Source_List_File_Location,
                        Continuation);
                     Continuation := True;
                  end if;
               end if;

               Language := Language.Next;
            end loop;
         end if;
      end Check_Missing_Sources;

      ------------------
      -- Check_Object --
      ------------------

      procedure Check_Object (Src : Source_Id) is
         Source : Source_Id;

      begin
         Source := Object_File_Names_Htable.Get (Object_Files, Src.Object);

         --  We cannot just check on "Source /= Src", since we might have
         --  two different entries for the same file (and since that's
         --  the same file it is expected that it has the same object)

         if Source /= No_Source
           and then Source.Replaced_By = No_Source
           and then Source.Path /= Src.Path
           and then Is_Extending (Src.Project, Source.Project)
         then
            Error_Msg_File_1 := Src.File;
            Error_Msg_File_2 := Source.File;
            Error_Msg
              (Data.Flags,
               "{ and { have the same object file name",
               No_Location, Project.Project);

         else
            Object_File_Names_Htable.Set (Object_Files, Src.Object, Src);
         end if;
      end Check_Object;

      ---------------------------
      -- Mark_Excluded_Sources --
      ---------------------------

      procedure Mark_Excluded_Sources is
         Source   : Source_Id := No_Source;
         Excluded : File_Found;
         Proj     : Project_Id;

      begin
         --  Minor optimization: if there are no excluded files, no need to
         --  traverse the list of sources. We cannot however also check whether
         --  the existing exceptions have ".Found" set to True (indicating we
         --  found them before) because we need to do some final processing on
         --  them in any case.

         if Excluded_Sources_Htable.Get_First (Project.Excluded) /=
                                                             No_File_Found
         then
            Proj := Project.Project;
            while Proj /= No_Project loop
               Iter := For_Each_Source (Data.Tree, Proj);
               while Prj.Element (Iter) /= No_Source loop
                  Source   := Prj.Element (Iter);
                  Excluded := Excluded_Sources_Htable.Get
                    (Project.Excluded, Source.File);

                  if Excluded /= No_File_Found then
                     Source.In_Interfaces   := False;
                     Source.Locally_Removed := True;

                     if Proj = Project.Project then
                        Source.Suppressed := True;
                     end if;

                     if Current_Verbosity = High then
                        Debug_Indent;
                        Write_Str ("removing file ");
                        Write_Line
                          (Get_Name_String (Excluded.File)
                           & " " & Get_Name_String (Source.Project.Name));
                     end if;

                     Excluded_Sources_Htable.Remove
                       (Project.Excluded, Source.File);
                  end if;

                  Next (Iter);
               end loop;

               Proj := Proj.Extends;
            end loop;
         end if;

         --  If we have any excluded element left, that means we did not find
         --  the source file

         Excluded := Excluded_Sources_Htable.Get_First (Project.Excluded);
         while Excluded /= No_File_Found loop
            if not Excluded.Found then

               --  Check if the file belongs to another imported project to
               --  provide a better error message.

               Src := Find_Source
                 (In_Tree          => Data.Tree,
                  Project          => Project.Project,
                  In_Imported_Only => True,
                  Base_Name        => Excluded.File);

               Err_Vars.Error_Msg_File_1 := Excluded.File;

               if Src = No_Source then
                  if Excluded.Excl_File = No_File then
                     Error_Msg
                       (Data.Flags,
                        "unknown file {", Excluded.Location, Project.Project);

                  else
                     Error_Msg
                    (Data.Flags,
                     "in " &
                     Get_Name_String (Excluded.Excl_File) & ":" &
                     No_Space_Img (Excluded.Excl_Line) &
                     ": unknown file {", Excluded.Location, Project.Project);
                  end if;

               else
                  if Excluded.Excl_File = No_File then
                     Error_Msg
                       (Data.Flags,
                        "cannot remove a source from an imported project: {",
                        Excluded.Location, Project.Project);

                  else
                     Error_Msg
                       (Data.Flags,
                        "in " &
                        Get_Name_String (Excluded.Excl_File) & ":" &
                          No_Space_Img (Excluded.Excl_Line) &
                        ": cannot remove a source from an imported project: {",
                        Excluded.Location, Project.Project);
                  end if;
               end if;
            end if;

            Excluded := Excluded_Sources_Htable.Get_Next (Project.Excluded);
         end loop;
      end Mark_Excluded_Sources;

      ------------------------
      -- Check_Object_Files --
      ------------------------

      procedure Check_Object_Files is
         Iter    : Source_Iterator;
         Src_Id  : Source_Id;
         Src_Ind : Source_File_Index;

      begin
         Iter := For_Each_Source (Data.Tree);
         loop
            Src_Id := Prj.Element (Iter);
            exit when Src_Id = No_Source;

            if Is_Compilable (Src_Id)
              and then Src_Id.Language.Config.Object_Generated
              and then Is_Extending (Project.Project, Src_Id.Project)
            then
               if Src_Id.Unit = No_Unit_Index then
                  if Src_Id.Kind = Impl then
                     Check_Object (Src_Id);
                  end if;

               else
                  case Src_Id.Kind is
                     when Spec =>
                        if Other_Part (Src_Id) = No_Source then
                           Check_Object (Src_Id);
                        end if;

                     when Sep =>
                        null;

                     when Impl =>
                        if Other_Part (Src_Id) /= No_Source then
                           Check_Object (Src_Id);

                        else
                           --  Check if it is a subunit

                           Src_Ind :=
                             Sinput.P.Load_Project_File
                               (Get_Name_String (Src_Id.Path.Display_Name));

                           if Sinput.P.Source_File_Is_Subunit (Src_Ind) then
                              Override_Kind (Src_Id, Sep);
                           else
                              Check_Object (Src_Id);
                           end if;
                        end if;
                  end case;
               end if;
            end if;

            Next (Iter);
         end loop;
      end Check_Object_Files;

      ----------------------------------
      -- Get_Sources_From_Source_Info --
      ----------------------------------

      procedure Get_Sources_From_Source_Info is
         Iter    : Source_Info_Iterator;
         Src     : Source_Info;
         Id      : Source_Id;
         Lang_Id : Language_Ptr;

      begin
         Initialize (Iter, Project.Project.Name);

         loop
            Src := Source_Info_Of (Iter);

            exit when Src = No_Source_Info;

            Id := new Source_Data;

            Id.Project := Project.Project;

            Lang_Id := Project.Project.Languages;
            while Lang_Id /= No_Language_Index
              and then Lang_Id.Name /= Src.Language
            loop
               Lang_Id := Lang_Id.Next;
            end loop;

            if Lang_Id = No_Language_Index then
               Prj.Com.Fail
                 ("unknown language " &
                  Get_Name_String (Src.Language) &
                  " for project " &
                  Get_Name_String (Src.Project) &
                  " in source info file");
            end if;

            Id.Language := Lang_Id;
            Id.Kind     := Src.Kind;
            Id.Index    := Src.Index;

            Id.Path :=
              (Path_Name_Type (Src.Display_Path_Name),
               Path_Name_Type (Src.Path_Name));

            Name_Len := 0;
            Add_Str_To_Name_Buffer
              (Directories.Simple_Name (Get_Name_String (Src.Path_Name)));
            Id.File := Name_Find;

            Id.Next_With_File_Name :=
              Source_Files_Htable.Get (Data.Tree.Source_Files_HT, Id.File);
            Source_Files_Htable.Set (Data.Tree.Source_Files_HT, Id.File, Id);

            Name_Len := 0;
            Add_Str_To_Name_Buffer
              (Directories.Simple_Name
                 (Get_Name_String (Src.Display_Path_Name)));
            Id.Display_File := Name_Find;

            Id.Dep_Name         :=
              Dependency_Name (Id.File, Id.Language.Config.Dependency_Kind);
            Id.Naming_Exception := Src.Naming_Exception;
            Id.Object           :=
              Object_Name (Id.File, Id.Language.Config.Object_File_Suffix);
            Id.Switches         := Switches_Name (Id.File);

            --  Add the source id to the Unit_Sources_HT hash table, if the
            --  unit name is not null.

            if Src.Kind /= Sep and then Src.Unit_Name /= No_Name then

               declare
                  UData : Unit_Index :=
                            Units_Htable.Get
                              (Data.Tree.Units_HT, Src.Unit_Name);
               begin
                  if UData = No_Unit_Index then
                     UData := new Unit_Data;
                     UData.Name := Src.Unit_Name;
                     Units_Htable.Set
                       (Data.Tree.Units_HT, Src.Unit_Name, UData);
                  end if;

                  Id.Unit := UData;
               end;

               --  Note that this updates Unit information as well

               Override_Kind (Id, Id.Kind);
            end if;

            if Src.Index /= 0 then
               Project.Project.Has_Multi_Unit_Sources := True;
            end if;

            --  Add the source to the language list

            Id.Next_In_Lang := Id.Language.First_Source;
            Id.Language.First_Source := Id;

            Next (Iter);
         end loop;
      end Get_Sources_From_Source_Info;

   --  Start of processing for Look_For_Sources

   begin
      if Data.Tree.Source_Info_File_Exists then
         Get_Sources_From_Source_Info;

      else
         if Project.Project.Source_Dirs /= Nil_String then
            Find_Excluded_Sources (Project, Data);

            if Project.Project.Languages /= No_Language_Index then
               Load_Naming_Exceptions (Project, Data);
               Find_Sources (Project, Data);
               Mark_Excluded_Sources;
               Check_Object_Files;
               Check_Missing_Sources;
            end if;
         end if;

         Object_File_Names_Htable.Reset (Object_Files);
      end if;
   end Look_For_Sources;

   ------------------
   -- Path_Name_Of --
   ------------------

   function Path_Name_Of
     (File_Name : File_Name_Type;
      Directory : Path_Name_Type) return String
   is
      Result        : String_Access;
      The_Directory : constant String := Get_Name_String (Directory);

   begin
      Debug_Output ("Path_Name_Of file name=", Name_Id (File_Name));
      Debug_Output ("Path_Name_Of directory=", Name_Id (Directory));
      Get_Name_String (File_Name);
      Result :=
        Locate_Regular_File
          (File_Name => Name_Buffer (1 .. Name_Len),
           Path      => The_Directory);

      if Result = null then
         return "";
      else
         declare
            R : constant String := Result.all;
         begin
            Free (Result);
            return R;
         end;
      end if;
   end Path_Name_Of;

   -------------------
   -- Remove_Source --
   -------------------

   procedure Remove_Source
     (Tree        : Project_Tree_Ref;
      Id          : Source_Id;
      Replaced_By : Source_Id)
   is
      Source : Source_Id;

   begin
      if Current_Verbosity = High then
         Debug_Indent;
         Write_Str ("removing source ");
         Write_Str (Get_Name_String (Id.File));

         if Id.Index /= 0 then
            Write_Str (" at" & Id.Index'Img);
         end if;

         Write_Eol;
      end if;

      if Replaced_By /= No_Source then
         Id.Replaced_By := Replaced_By;
         Replaced_By.Declared_In_Interfaces := Id.Declared_In_Interfaces;

         if Id.File /= Replaced_By.File then
            declare
               Replacement : constant File_Name_Type :=
                               Replaced_Source_HTable.Get
                                 (Tree.Replaced_Sources, Id.File);

            begin
               Replaced_Source_HTable.Set
                 (Tree.Replaced_Sources, Id.File, Replaced_By.File);

               if Replacement = No_File then
                  Tree.Replaced_Source_Number :=
                    Tree.Replaced_Source_Number + 1;
               end if;
            end;
         end if;
      end if;

      Id.In_Interfaces := False;
      Id.Locally_Removed := True;

      --  ??? Should we remove the source from the unit ? The file is not used,
      --  so probably should not be referenced from the unit. On the other hand
      --  it might give useful additional info
      --        if Id.Unit /= null then
      --           Id.Unit.File_Names (Id.Kind) := null;
      --        end if;

      Source := Id.Language.First_Source;

      if Source = Id then
         Id.Language.First_Source := Id.Next_In_Lang;

      else
         while Source.Next_In_Lang /= Id loop
            Source := Source.Next_In_Lang;
         end loop;

         Source.Next_In_Lang := Id.Next_In_Lang;
      end if;
   end Remove_Source;

   -----------------------
   -- Report_No_Sources --
   -----------------------

   procedure Report_No_Sources
     (Project      : Project_Id;
      Lang_Name    : String;
      Data         : Tree_Processing_Data;
      Location     : Source_Ptr;
      Continuation : Boolean := False)
   is
   begin
      case Data.Flags.When_No_Sources is
         when Silent =>
            null;

         when Warning | Error =>
            declare
               Msg : constant String :=
                      "<there are no "
                      & Lang_Name & " sources in this project";

            begin
               Error_Msg_Warn := Data.Flags.When_No_Sources = Warning;

               if Continuation then
                  Error_Msg (Data.Flags, "\" & Msg, Location, Project);
               else
                  Error_Msg (Data.Flags, Msg, Location, Project);
               end if;
            end;
      end case;
   end Report_No_Sources;

   ----------------------
   -- Show_Source_Dirs --
   ----------------------

   procedure Show_Source_Dirs
     (Project : Project_Id;
      Shared  : Shared_Project_Tree_Data_Access)
   is
      Current : String_List_Id;
      Element : String_Element;

   begin
      if Project.Source_Dirs = Nil_String then
         Debug_Output ("no Source_Dirs");
      else
         Debug_Increase_Indent ("Source_Dirs:");

         Current := Project.Source_Dirs;
         while Current /= Nil_String loop
            Element := Shared.String_Elements.Table (Current);
            Debug_Output (Get_Name_String (Element.Display_Value));
            Current := Element.Next;
         end loop;

         Debug_Decrease_Indent ("end Source_Dirs.");
      end if;
   end Show_Source_Dirs;

   ---------------------------
   -- Process_Naming_Scheme --
   ---------------------------

   procedure Process_Naming_Scheme
     (Tree         : Project_Tree_Ref;
      Root_Project : Project_Id;
      Node_Tree    : Prj.Tree.Project_Node_Tree_Ref;
      Flags        : Processing_Flags)
   is

      procedure Check
        (Project          : Project_Id;
         In_Aggregate_Lib : Boolean;
         Data             : in out Tree_Processing_Data);
      --  Process the naming scheme for a single project

      procedure Recursive_Check
        (Project  : Project_Id;
         Prj_Tree : Project_Tree_Ref;
         Context  : Project_Context;
         Data     : in out Tree_Processing_Data);
      --  Check_Naming_Scheme for the project

      -----------
      -- Check --
      -----------

      procedure Check
        (Project          : Project_Id;
         In_Aggregate_Lib : Boolean;
         Data             : in out Tree_Processing_Data)
      is
         procedure Check_Aggregated;
         --  Check aggregated projects which should not be externally built

         ----------------------
         -- Check_Aggregated --
         ----------------------

         procedure Check_Aggregated is
            L : Aggregated_Project_List;

         begin
            --  Check that aggregated projects are not externally built

            L := Project.Aggregated_Projects;
            while L /= null loop
               declare
                  Var : constant Prj.Variable_Value :=
                          Prj.Util.Value_Of
                            (Snames.Name_Externally_Built,
                             L.Project.Decl.Attributes,
                             Data.Tree.Shared);
               begin
                  if not Var.Default then
                     Error_Msg_Name_1 := L.Project.Display_Name;
                     Error_Msg
                       (Data.Flags,
                        "cannot aggregate externally built project %%",
                        Var.Location, Project);
                  end if;
               end;

               L := L.Next;
            end loop;
         end Check_Aggregated;

         --  Local Variables

         Shared   : constant Shared_Project_Tree_Data_Access :=
                      Data.Tree.Shared;
         Prj_Data : Project_Processing_Data;

      --  Start of processing for Check

      begin
         Debug_Increase_Indent ("check", Project.Name);

         Initialize (Prj_Data, Project);

         Check_If_Externally_Built (Project, Data);

         case Project.Qualifier is
            when Aggregate =>
               Check_Aggregated;

            when Aggregate_Library =>
               Check_Aggregated;

               if Project.Object_Directory = No_Path_Information then
                  Project.Object_Directory := Project.Directory;
               end if;

            when others =>
               Get_Directories (Project, Data);
               Check_Programming_Languages (Project, Data);

               if Current_Verbosity = High then
                  Show_Source_Dirs (Project, Shared);
               end if;

               if Project.Qualifier = Dry then
                  Check_Abstract_Project (Project, Data);
               end if;
         end case;

         --  Check configuration. Must be done for gnatmake (even though no
         --  user configuration file was provided) since the default config we
         --  generate indicates whether libraries are supported for instance.

         Check_Configuration (Project, Data);

         if Project.Qualifier /= Aggregate then
            Check_Library_Attributes (Project, Data);
            Check_Package_Naming (Project, Data);

            --  An aggregate library has no source, no need to look for them

            if Project.Qualifier /= Aggregate_Library then
               Look_For_Sources (Prj_Data, Data);
            end if;

            Check_Interfaces (Project, Data);

            --  If this library is part of an aggregated library don't check it
            --  as it has no sources by itself and so interface won't be found.

            if Project.Library and not In_Aggregate_Lib then
               Check_Stand_Alone_Library (Project, Data);
            end if;

            Get_Mains (Project, Data);
         end if;

         Free (Prj_Data);

         Debug_Decrease_Indent ("done check");
      end Check;

      ---------------------
      -- Recursive_Check --
      ---------------------

      procedure Recursive_Check
        (Project  : Project_Id;
         Prj_Tree : Project_Tree_Ref;
         Context  : Project_Context;
         Data     : in out Tree_Processing_Data)
      is
      begin
         if Current_Verbosity = High then
            Debug_Increase_Indent
              ("Processing_Naming_Scheme for project", Project.Name);
         end if;

         Data.Tree := Prj_Tree;
         Data.In_Aggregate_Lib := Context.In_Aggregate_Lib;

         Check (Project, Context.In_Aggregate_Lib, Data);

         if Current_Verbosity = High then
            Debug_Decrease_Indent ("done Processing_Naming_Scheme");
         end if;
      end Recursive_Check;

      procedure Check_All_Projects is new For_Every_Project_Imported_Context
        (Tree_Processing_Data, Recursive_Check);
      --  Comment required???

      --  Local Variables

      Data : Tree_Processing_Data;

   --  Start of processing for Process_Naming_Scheme

   begin
      Lib_Data_Table.Init;
      Initialize (Data, Tree => Tree, Node_Tree => Node_Tree, Flags => Flags);
      Check_All_Projects (Root_Project, Tree, Data, Imported_First => True);
      Free (Data);

      --  Adjust language configs for projects that are extended

      declare
         List : Project_List;
         Proj : Project_Id;
         Exte : Project_Id;
         Lang : Language_Ptr;
         Elng : Language_Ptr;

      begin
         List := Tree.Projects;
         while List /= null loop
            Proj := List.Project;

            Exte := Proj;
            while Exte.Extended_By /= No_Project loop
               Exte := Exte.Extended_By;
            end loop;

            if Exte /= Proj then
               Lang := Proj.Languages;

               if Lang /= No_Language_Index then
                  loop
                     Elng := Get_Language_From_Name
                       (Exte, Get_Name_String (Lang.Name));
                     exit when Elng /= No_Language_Index;
                     Exte := Exte.Extends;
                  end loop;

                  if Elng /= Lang then
                     Lang.Config := Elng.Config;
                  end if;
               end if;
            end if;

            List := List.Next;
         end loop;
      end;
   end Process_Naming_Scheme;

end Prj.Nmsc;