[Bug debug/54534] [4.7 Regression] Missing location for unused variable

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54534

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-11 
09:49:27 UTC ---
I am testing

Index: gcc/cgraph.h
===================================================================
--- gcc/cgraph.h        (revision 191174)
+++ gcc/cgraph.h        (working copy)
@@ -951,7 +951,7 @@ varpool_can_remove_if_no_refs (struct va
   return (!node->force_output && !node->used_from_other_partition
          && ((DECL_COMDAT (node->decl)
               && !varpool_used_from_object_file_p (node))
-             || !node->externally_visible
+             || (flag_toplevel_reorder && !node->externally_visible)
              || DECL_HAS_VALUE_EXPR_P (node->decl)));
 }

which restores previous behavior.