Improve -fuse-ld=[bfd|gold] check

	PR driver/59321
	* collect2.c (main): Check -fuse-ld=[bfd|gold] when
	DEFAULT_LINKER is defined.
	* common.opt (fuse-ld=bfd): Add Driver.
	(fuse-ld=gold): Likewise.
	* gcc.c (use_ld): New variable.
	(driver_handle_option): Set use_ld for OPT_fuse_ld_bfd and
	OPT_fuse_ld_gold.
	(main): Check -fuse-ld=[bfd|gold] for -print-prog-name=ld.

From-SVN: r206129

gcc/ChangeLog

+2013-12-19  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR driver/59321
+	* collect2.c (main): Check -fuse-ld=[bfd|gold] when
+	DEFAULT_LINKER is defined.
+	* common.opt (fuse-ld=bfd): Add Driver.
+	(fuse-ld=gold): Likewise.
+	* gcc.c (use_ld): New variable.
+	(driver_handle_option): Set use_ld for OPT_fuse_ld_bfd and
+	OPT_fuse_ld_gold.
+	(main): Check -fuse-ld=[bfd|gold] for -print-prog-name=ld.
+
 2013-12-19  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* Makefile.in (TEXI_GCC_FILES): Add arm-acle-intrinsics.texi.

gcc/collect2.c

@@ -1121,7 +1121,35 @@ main (int argc, char **argv)
   /* Maybe we know the right file to use (if not cross).  */
   ld_file_name = 0;
 #ifdef DEFAULT_LINKER
-  if (access (DEFAULT_LINKER, X_OK) == 0)
+  if (selected_linker == USE_BFD_LD || selected_linker == USE_GOLD_LD)
+    {
+      char *linker_name;
+# ifdef HOST_EXECUTABLE_SUFFIX
+      int len = (sizeof (DEFAULT_LINKER)
+		 - sizeof (HOST_EXECUTABLE_SUFFIX));
+      linker_name = NULL;
+      if (len > 0)
+	{
+	  char *default_linker = xstrdup (DEFAULT_LINKER);
+	  /* Strip HOST_EXECUTABLE_SUFFIX if DEFAULT_LINKER contains
+	     HOST_EXECUTABLE_SUFFIX.  */
+	  if (! strcmp (&default_linker[len], HOST_EXECUTABLE_SUFFIX))
+	    {
+	      default_linker[len] = '\0';
+	      linker_name = concat (default_linker,
+				    &ld_suffixes[selected_linker][2],
+				    HOST_EXECUTABLE_SUFFIX, NULL);
+	    }
+	}
+      if (linker_name == NULL)
+# endif
+      linker_name = concat (DEFAULT_LINKER,
+			    &ld_suffixes[selected_linker][2],
+			    NULL);
+      if (access (linker_name, X_OK) == 0)
+	ld_file_name = linker_name;
+    }
+  if (ld_file_name == 0 && access (DEFAULT_LINKER, X_OK) == 0)
     ld_file_name = DEFAULT_LINKER;
   if (ld_file_name == 0)
 #endif

gcc/common.opt

@@ -2250,11 +2250,11 @@ Common Report Var(flag_unwind_tables) Optimization
 Just generate unwind tables for exception handling
 
 fuse-ld=bfd
-Common Negative(fuse-ld=gold)
+Common Driver Negative(fuse-ld=gold)
 Use the bfd linker instead of the default linker
 
 fuse-ld=gold
-Common Negative(fuse-ld=bfd)
+Common Driver Negative(fuse-ld=bfd)
 Use the gold linker instead of the default linker
 
 fuse-linker-plugin

gcc/gcc.c

@@ -105,6 +105,9 @@ static int verbose_only_flag;
 
 static int print_subprocess_help;
 
+/* Linker suffix passed to -fuse-ld=... */
+static const char *use_ld;
+
 /* Whether we should report subprocess execution times to a file.  */
 
 FILE *report_times_to_file = NULL;
@@ -3380,6 +3383,14 @@ driver_handle_option (struct gcc_options *opts,
       do_save = false;
       break;
 
+    case OPT_fuse_ld_bfd:
+       use_ld = ".bfd";
+       break;
+
+    case OPT_fuse_ld_gold:
+       use_ld = ".gold";
+       break;
+
     case OPT_fcompare_debug_second:
       compare_debug_second = 1;
       break;
@@ -6708,6 +6719,38 @@ main (int argc, char **argv)
 
   if (print_prog_name)
     {
+      if (use_ld != NULL && ! strcmp (print_prog_name, "ld"))
+	{
+	  /* Append USE_LD to to the default linker.  */
+#ifdef DEFAULT_LINKER
+	  char *ld;
+# ifdef HAVE_HOST_EXECUTABLE_SUFFIX
+	  int len = (sizeof (DEFAULT_LINKER)
+		     - sizeof (HOST_EXECUTABLE_SUFFIX));
+	  ld = NULL;
+	  if (len > 0)
+	    {
+	      char *default_linker = xstrdup (DEFAULT_LINKER);
+	      /* Strip HOST_EXECUTABLE_SUFFIX if DEFAULT_LINKER contains
+		 HOST_EXECUTABLE_SUFFIX.  */
+	      if (! strcmp (&default_linker[len], HOST_EXECUTABLE_SUFFIX))
+		{
+		  default_linker[len] = '\0';
+		  ld = concat (default_linker, use_ld,
+			       HOST_EXECUTABLE_SUFFIX, NULL);
+		}
+	    }
+	  if (ld == NULL)
+# endif
+	  ld = concat (DEFAULT_LINKER, use_ld, NULL);
+	  if (access (ld, X_OK) == 0)
+	    {
+	      printf ("%s\n", ld);
+	      return (0);
+	    }
+#endif
+	  print_prog_name = concat (print_prog_name, use_ld, NULL);
+	}
       char *newname = find_a_file (&exec_prefixes, print_prog_name, X_OK, 0);
       printf ("%s\n", (newname ? newname : print_prog_name));
       return (0);