Index: gcc/c-family/c-common.c
===================================================================
--- gcc/c-family/c-common.c	(revision 160501)
+++ gcc/c-family/c-common.c	(working copy)
@@ -4918,7 +4918,7 @@
   unsigned_ptrdiff_type_node = c_common_unsigned_type (ptrdiff_type_node);
 
   lang_hooks.decls.pushdecl
-    (build_decl (UNKNOWN_LOCATION,
+    (build_decl (BUILTINS_LOCATION,
 		 TYPE_DECL, get_identifier ("__builtin_va_list"),
 		 va_list_type_node));
   if (targetm.enum_va_list)