re PR c++/35652 (offset warning should be given in the front-end)

       PR c/35652
       * builtins.c (c_strlen): Suppressed multiple warnings that can occur
       with propagated string constants.

From-SVN: r134714

gcc/ChangeLog

+2008-04-26  Simon Baldwin <simonb@google.com>
+
+	PR c/35652
+	* builtins.c (c_strlen): Suppressed multiple warnings that can occur
+	with propagated string constants.
+
 2008-04-26  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.md (fix_trunc<mode>_i387_fisttp_with_temp): Use 'X'

gcc/builtins.c

@@ -447,7 +447,12 @@ c_strlen (tree src, int only_value)
      runtime.  */
   if (offset < 0 || offset > max)
     {
-      warning (0, "offset outside bounds of constant string");
+     /* Suppress multiple warnings for propagated constant strings.  */
+      if (! TREE_NO_WARNING (src))
+        {
+          warning (0, "offset outside bounds of constant string");
+          TREE_NO_WARNING (src) = 1;
+        }
       return NULL_TREE;
     }