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/usr/src/gcc-5/debian/patches/gdc-5.diff is in gcc-5-source 5.3.1-14ubuntu2.

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# DP: This implements D language support in the GCC back end, and adds
# DP: relevant documentation about the GDC front end (code part).

Index: b/src/gcc/config/darwin.h
===================================================================
--- a/src/gcc/config/darwin.h
+++ b/src/gcc/config/darwin.h
@@ -49,6 +49,10 @@ see the files COPYING3 and COPYING.RUNTI
 /* Suppress g++ attempt to link in the math library automatically. */
 #define MATH_LIBRARY ""
 
+/* Suppress gdc attempt to link in the thread and time library automatically. */
+#define THREAD_LIBRARY ""
+#define TIME_LIBRARY ""
+
 /* We have atexit.  */
 
 #define HAVE_ATEXIT
Index: b/src/gcc/config/i386/cygming.h
===================================================================
--- a/src/gcc/config/i386/cygming.h
+++ b/src/gcc/config/i386/cygming.h
@@ -170,6 +170,10 @@ along with GCC; see the file COPYING3.
 
 #undef MATH_LIBRARY
 #define MATH_LIBRARY ""
+#undef THREAD_LIBRARY
+#define THREAD_LIBRARY ""
+#undef TIME_LIBRARY
+#define TIME_LIBRARY ""
 
 #undef TARGET_LIBC_HAS_FUNCTION
 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
Index: b/src/gcc/config/linux-android.h
===================================================================
--- a/src/gcc/config/linux-android.h
+++ b/src/gcc/config/linux-android.h
@@ -57,3 +57,9 @@
 
 #define ANDROID_ENDFILE_SPEC \
   "%{shared: crtend_so%O%s;: crtend_android%O%s}"
+
+/* Suppress gdc attempt to link in the thread and time library automatically. */
+#if ANDROID_DEFAULT
+# define THREAD_LIBRARY ""
+# define TIME_LIBRARY ""
+#endif
Index: b/src/gcc/config/rs6000/rs6000.c
===================================================================
--- a/src/gcc/config/rs6000/rs6000.c
+++ b/src/gcc/config/rs6000/rs6000.c
@@ -25733,7 +25733,8 @@ rs6000_output_function_epilogue (FILE *f
       if (lang_GNU_C ()
 	  || ! strcmp (language_string, "GNU GIMPLE")
 	  || ! strcmp (language_string, "GNU Go")
-	  || ! strcmp (language_string, "libgccjit"))
+	  || ! strcmp (language_string, "libgccjit")
+	  || ! strcmp (language_string, "GNU D"))
 	i = 0;
       else if (! strcmp (language_string, "GNU F77")
 	       || lang_GNU_Fortran ())
Index: b/src/gcc/dwarf2out.c
===================================================================
--- a/src/gcc/dwarf2out.c
+++ b/src/gcc/dwarf2out.c
@@ -4756,6 +4756,15 @@ is_ada (void)
   return lang == DW_LANG_Ada95 || lang == DW_LANG_Ada83;
 }
 
+/* Return TRUE if the language is D.  */
+static inline bool
+is_dlang (void)
+{
+  unsigned int lang = get_AT_unsigned (comp_unit_die (), DW_AT_language);
+
+  return lang == DW_LANG_D;
+}
+
 /* Remove the specified attribute if present.  */
 
 static void
@@ -19843,6 +19852,8 @@ gen_compile_unit_die (const char *filena
 	language = DW_LANG_ObjC;
       else if (strcmp (language_string, "GNU Objective-C++") == 0)
 	language = DW_LANG_ObjC_plus_plus;
+      else if (strcmp (language_string, "GNU D") == 0)
+	language = DW_LANG_D;
       else if (dwarf_version >= 5 || !dwarf_strict)
 	{
 	  if (strcmp (language_string, "GNU Go") == 0)
@@ -20811,7 +20822,7 @@ declare_in_namespace (tree thing, dw_die
 
   if (ns_context != context_die)
     {
-      if (is_fortran ())
+      if (is_fortran () || is_dlang ())
 	return ns_context;
       if (DECL_P (thing))
 	gen_decl_die (thing, NULL, ns_context);
@@ -20834,7 +20845,7 @@ gen_namespace_die (tree decl, dw_die_ref
     {
       /* Output a real namespace or module.  */
       context_die = setup_namespace_context (decl, comp_unit_die ());
-      namespace_die = new_die (is_fortran ()
+      namespace_die = new_die (is_fortran () || is_dlang ()
 			       ? DW_TAG_module : DW_TAG_namespace,
 			       context_die, decl);
       /* For Fortran modules defined in different CU don't add src coords.  */
@@ -20897,7 +20908,7 @@ gen_decl_die (tree decl, tree origin, dw
       break;
 
     case CONST_DECL:
-      if (!is_fortran () && !is_ada ())
+      if (!is_fortran () && !is_ada () && !is_dlang ())
 	{
 	  /* The individual enumerators of an enum type get output when we output
 	     the Dwarf representation of the relevant enum type itself.  */
@@ -21368,7 +21379,7 @@ dwarf2out_decl (tree decl)
     case CONST_DECL:
       if (debug_info_level <= DINFO_LEVEL_TERSE)
 	return;
-      if (!is_fortran () && !is_ada ())
+      if (!is_fortran () && !is_ada () && !is_dlang ())
 	return;
       if (TREE_STATIC (decl) && decl_function_context (decl))
 	context_die = lookup_decl_die (DECL_CONTEXT (decl));
Index: b/src/gcc/gcc.c
===================================================================
--- a/src/gcc/gcc.c
+++ b/src/gcc/gcc.c
@@ -1148,6 +1148,7 @@ static const struct compiler default_com
   {".java", "#Java", 0, 0, 0}, {".class", "#Java", 0, 0, 0},
   {".zip", "#Java", 0, 0, 0}, {".jar", "#Java", 0, 0, 0},
   {".go", "#Go", 0, 1, 0},
+  {".d", "#D", 0, 1, 0}, {".dd", "#D", 0, 1, 0}, {".di", "#D", 0, 1, 0},
   /* Next come the entries for C.  */
   {".c", "@c", 0, 0, 1},
   {"@c",