--- cp/tree.c~	2012-12-07 10:01:16.665415647 +0100
+++ cp/tree.c	2012-12-07 10:11:01.373410862 +0100
@@ -396,7 +396,8 @@
    callable.  */

 tree
-build_aggr_init_expr (tree type, tree init, tsubst_flags_t /*complain*/)
+build_aggr_init_expr (tree type, tree init,
+		      tsubst_flags_t complain ATTRIBUTE_UNUSED)
 {
   tree fn;
   tree slot;