/usr/src/gcc-4.4/debian/patches/pr25509.diff is in gcc-4.4-source 4.4.7-8ubuntu1.
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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 | # DP: Backport of PR c/25509, new option -Wno-unused-result
gcc/
2009-07-10 Manuel López-Ibáñez <manu@gcc.gnu.org>
PR 25509
PR 40614
* c.opt (Wunused-result): New.
* doc/invoke.texi: Document it.
* c-common.c (c_warn_unused_result): Use it.
gcc/testsuite/
2009-07-10 Manuel López-Ibáñez <manu@gcc.gnu.org>
PR 25509
PR 40614
* g++.dg/warn/unused-result1-Werror.c: New.
Index: gcc/testsuite/g++.dg/warn/unused-result1-Werror.c
===================================================================
--- a/src/gcc/testsuite/g++.dg/warn/unused-result1-Werror.c (revision 0)
+++ b/src/gcc/testsuite/g++.dg/warn/unused-result1-Werror.c (revision 0)
@@ -0,0 +1,10 @@
+// PR 40614
+// { dg-options "-Werror=unused-result" }
+class QByteArray {
+public:
+ QByteArray(const QByteArray &);
+};
+class QString {
+ QByteArray toLocal8Bit() const __attribute__ ((warn_unused_result));
+ void fooWarnHere() const { toLocal8Bit(); } // { dg-error "ignoring" }
+};
Index: gcc/c.opt
===================================================================
--- a/src/gcc/c.opt (revision 149591)
+++ b/src/gcc/c.opt (working copy)
@@ -476,6 +476,10 @@
C ObjC C++ ObjC++ Warning
Warn about macros defined in the main file that are not used
+Wunused-result
+C ObjC C++ ObjC++ Var(warn_unused_result) Init(1) Warning
+Warn if a caller of a function, marked with attribute warn_unused_result, does not use its return value
+
Wvariadic-macros
C ObjC C++ ObjC++ Warning
Do not warn about using variadic macros when -pedantic
Index: gcc/c-common.c
===================================================================
--- a/src/gcc/c-common.c (revision 149591)
+++ b/src/gcc/c-common.c (working copy)
@@ -7567,11 +7567,11 @@
location_t loc = gimple_location (g);
if (fdecl)
- warning (0, "%Hignoring return value of %qD, "
+ warning (OPT_Wunused_result, "%Hignoring return value of %qD, "
"declared with attribute warn_unused_result",
&loc, fdecl);
else
- warning (0, "%Hignoring return value of function "
+ warning (OPT_Wunused_result, "%Hignoring return value of function "
"declared with attribute warn_unused_result",
&loc);
}
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