re PR c++/9021 ([win32] No exports possible when using a class pointer in an union)

	PR c++/9021
  	PR c++/11005
	* parser.c (cp_parser_elaborated_type_specifier): Warn about
	attributes and discard.
	* decl.c (xref_tag): Don't overwite existing attributes with
	NULL_TREE.

From-SVN: r75846

gcc/cp/ChangeLog

+2004-01-14  Danny Smith  <dannysmith@users,sourceforge.net>
+
+	PR c++/9021
+  	PR c++/11005
+	* parser.c (cp_parser_elaborated_type_specifier): Warn about
+	attributes and discard.
+	* decl.c (xref_tag): Don't overwite existing attributes with
+	NULL_TREE.
+
 2004-01-14  Giovanni Bajo  <giovannibajo@gcc.gnu.org>
 
 	PR c++/12335

gcc/cp/decl.c

 /* Process declarations and variables for C++ compiler.
    Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-   2001, 2002, 2003  Free Software Foundation, Inc.
+   2001, 2002, 2003, 2004  Free Software Foundation, Inc.
    Contributed by Michael Tiemann (tiemann@cygnus.com)
 
 This file is part of GCC.
@@ -9477,7 +9477,15 @@ xref_tag (enum tag_types tag_code, tree name, tree attributes,
 	redeclare_class_template (t, current_template_parms);
     }
 
-  TYPE_ATTRIBUTES (t) = attributes;
+  /* Add attributes only when defining a class. */
+  if (attributes)
+    {
+      /* The only place that xref_tag is called with non-null
+	 attributes is in cp_parser_class_head(), when defining a
+	 class.  */ 
+      my_friendly_assert (TYPE_ATTRIBUTES (t) == NULL_TREE, 20040113);
+      TYPE_ATTRIBUTES (t) = attributes;
+    }
 
   POP_TIMEVAR_AND_RETURN (TV_NAME_LOOKUP, t);
 }

gcc/cp/parser.c

@@ -9065,8 +9065,12 @@ cp_parser_elaborated_type_specifier (cp_parser* parser,
 	     definition of a new type; a new type can only be declared in a
 	     declaration context.  */
 
+ 	  /* Warn about attributes. They are ignored.  */
+ 	  if (attributes)
+	    warning ("type attributes are honored only at type definition");
+
 	  type = xref_tag (tag_type, identifier, 
-			   attributes,
+			   /*attributes=*/NULL_TREE,
 			   (is_friend 
 			    || !is_declaration
 			    || cp_lexer_next_token_is_not (parser->lexer,