typeck.c (build_component_ref): Make sure FIELD has a lang_specific piece before…

typeck.c (build_component_ref): Make sure FIELD has a lang_specific piece before checking DECL_MUTABLE_P.

	* typeck.c (build_component_ref): Make sure FIELD has a lang_specific
	piece before checking DECL_MUTABLE_P.

From-SVN: r20406

gcc/cp/ChangeLog

+1998-06-10  Brendan Kehoe  <brendan@cygnus.com>
+
+	* typeck.c (build_component_ref): Make sure FIELD has a lang_specific
+	piece before checking DECL_MUTABLE_P.
+
 1998-06-10  John Carr  <jfc@mit.edu>
 
 	* tree.c (debug_binfo): Make printf format match arguments.

gcc/cp/typeck.c

@@ -2114,7 +2114,7 @@ build_component_ref (datum, component, basetype_path, protect)
     TREE_READONLY (ref) = 1;
   if (TREE_THIS_VOLATILE (datum) || TREE_THIS_VOLATILE (field))
     TREE_THIS_VOLATILE (ref) = 1;
-  if (DECL_MUTABLE_P (field))
+  if (DECL_LANG_SPECIFIC (field) && DECL_MUTABLE_P (field))
     TREE_READONLY (ref) = 0;
 
   return ref;