re PR c++/28560 (Trouble with __attribute__ in template parameter)

        PR c++/28560
        * decl.c (groktypename): Also ignore attributes on dependent
        possibly-class types.

From-SVN: r131755

gcc/cp/ChangeLog

@@ -9,6 +9,10 @@
 
 2008-01-22  Jason Merrill  <jason@redhat.com>
 
+	PR c++/28560
+	* decl.c (groktypename): Also ignore attributes on dependent 
+	possibly-class types.
+
 	PR c++/34912
 	* friend.c (do_friend): Check for prior declaration of a friend 
 	function of a local class.

gcc/cp/decl.c

@@ -3908,8 +3908,12 @@ groktypename (cp_decl_specifier_seq *type_specifiers,
   if (attrs)
     {
       if (CLASS_TYPE_P (type))
-	warning (OPT_Wattributes, "ignoring attributes applied to class type "
-		 "outside of definition");
+	warning (OPT_Wattributes, "ignoring attributes applied to class type %qT "
+		 "outside of definition", type);
+      else if (IS_AGGR_TYPE (type))
+	/* A template type parameter or other dependent type.  */
+	warning (OPT_Wattributes, "ignoring attributes applied to dependent "
+		 "type %qT without an associated declaration", type);
       else
 	cplus_decl_attributes (&type, attrs, 0);
     }

gcc/testsuite/g++.dg/ext/tmplattr8.C

+// PR c++/28560
+
+template<typename> struct A {};
+
+template<int> struct B;
+
+template<int N> struct C :
+  A<typename B<N>::X __attribute__((unused))> {}; // { dg-warning "attribute" }