2013-08-22  Magnus Granberg <zorry@gentoo.org>

	* gcc/gcc.c (main): Add support for external spec file via the GCC_SPECS env var
	and move the process of the user specifed specs.

    This allows us to easily control pie/ssp defaults with gcc-config profiles.
    Original patch by Rob Holland
    Extended to support multiple entries separated by ':' by Kevin F. Quinn
    Modified to use getenv instead of poisoned GET_ENVIRONMENT by Ryan Hill
    Modified to process the GCC_SPECS env var befor DRIVER_SELF_SPECS by Magnus Granberg

--- gcc-4.8-20130210/gcc/gcc.c	2013-02-05 16:55:31.000000000 +0100
+++ gcc-4.8-20130210-work/gcc/gcc.c	2013-07-26 02:32:14.625089864 +0200
@@ -6427,6 +6428,48 @@ main (int argc, char **argv)
     do_option_spec (option_default_specs[i].name,
 		    option_default_specs[i].spec);
 
+#if !(defined (__MSDOS__) || defined (OS2) || defined (VMS) || defined (WIN32))
+  /* Add specs listed in GCC_SPECS.  Note; in the process of separating
+   * each spec listed, the string is overwritten at token boundaries
+   * (':') with '\0', an effect of strtok_r().
+   */
+  specs_file = getenv ("GCC_SPECS");
+  if (specs_file && (strlen(specs_file) > 0))
+    {
+      char *spec, *saveptr;
+      for (spec=strtok_r(specs_file,":",&saveptr);
+           spec!=NULL;
+           spec=strtok_r(NULL,":",&saveptr))
+        {
+          struct user_specs *user = (struct user_specs *)
+            xmalloc (sizeof (struct user_specs));
+          user->next = (struct user_specs *) 0;
+          user->filename = spec;
+          if (user_specs_tail)
+            user_specs_tail->next = user;
+          else
+            user_specs_head = user;
+          user_specs_tail = user;
+        }
+    }
+#endif
+  /* Process any user specified specs in the order given on the command
+   *     line.  */
+  for (uptr = user_specs_head; uptr; uptr = uptr->next)
+    {
+      char *filename = find_a_file (&startfile_prefixes, uptr->filename,
+        R_OK, true);
+      read_specs (filename ? filename : uptr->filename, false, true);
+    }
+  /* Process any user self specs.  */
+  {
+    struct spec_list *sl;
+    for (sl = specs; sl; sl = sl->next)
+      if (sl->name_len == sizeof "self_spec" - 1
+          && !strcmp (sl->name, "self_spec"))
+        do_self_spec (*sl->ptr_spec);
+  }
+
   /* Process DRIVER_SELF_SPECS, adding any new options to the end
      of the command line.  */
 
@@ -6535,24 +6578,6 @@ main (int argc, char **argv)
 			      PREFIX_PRIORITY_LAST, 0, 1);
     }
 
-  /* Process any user specified specs in the order given on the command
-     line.  */
-  for (uptr = user_specs_head; uptr; uptr = uptr->next)
-    {
-      char *filename = find_a_file (&startfile_prefixes, uptr->filename,
-				    R_OK, true);
-      read_specs (filename ? filename : uptr->filename, false, true);
-    }
-
-  /* Process any user self specs.  */
-  {
-    struct spec_list *sl;
-    for (sl = specs; sl; sl = sl->next)
-      if (sl->name_len == sizeof "self_spec" - 1
-	  && !strcmp (sl->name, "self_spec"))
-	do_self_spec (*sl->ptr_spec);
-  }
-
   if (compare_debug)
     {
       enum save_temps save;