Index: config/alpha/alpha.c
===================================================================
--- config/alpha/alpha.c	(revision 162794)
+++ config/alpha/alpha.c	(working copy)
@@ -5948,6 +5948,7 @@ alpha_build_builtin_va_list (void)
   ofs = build_decl (BUILTINS_LOCATION,
 		    FIELD_DECL, get_identifier ("__offset"),
 		    integer_type_node);
+  TREE_THIS_VOLATILE (ofs) = 1;
   DECL_FIELD_CONTEXT (ofs) = record;
   DECL_CHAIN (ofs) = space;