Add support for external spec file via the GCC_SPECS env var.  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

--- gcc-4/gcc/gcc.c
+++ gcc-4/gcc/gcc.c
@@ -6482,6 +6482,32 @@
 
   /* Process any user specified specs in the order given on the command
      line.  */
+#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
   for (uptr = user_specs_head; uptr; uptr = uptr->next)
     {
       char *filename = find_a_file (&startfile_prefixes, uptr->filename,