re PR c++/52465 (g++ rejects valid code with in-class using declaration)

gcc/testsuite/ChangeLog

2012-04-09  Fabien Chêne  <fabien@gcc.gnu.org>

	PR c++/52465
	* g++.dg/lookup/using52.C: New.

gcc/cp/ChangeLog

2012-04-09  Fabien Chêne  <fabien@gcc.gnu.org>

	PR c++/52465
	* parser.c (cp_parser_class_name): Call strip_using_decl and
	return the target decl.
	* name-lookup.c (strip_using_decl): Returns NULL_TREE if the decl
	to be stripped is NULL_TREE.
	(qualify_lookup): Call strip_using_decl and perform some checks on
	the target decl.

From-SVN: r186355

gcc/cp/ChangeLog

+2012-04-11  Fabien Chêne  <fabien@gcc.gnu.org>
+
+	PR c++/52465
+	* parser.c (cp_parser_class_name): Call strip_using_decl and
+	return the target decl.
+	* name-lookup.c (strip_using_decl): Returns NULL_TREE if the decl
+	to be stripped is NULL_TREE.
+	(qualify_lookup): Call strip_using_decl and perform some checks on
+	the target decl.
+
 2012-04-11  Jason Merrill  <jason@redhat.com>
 
 	PR debug/45088

gcc/cp/name-lookup.c

 /* Definitions for C++ name lookup routines.
-   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
+   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
    Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>
 
@@ -400,6 +400,9 @@ pop_binding (tree id, tree decl)
 tree
 strip_using_decl (tree decl)
 {
+  if (decl == NULL_TREE)
+    return NULL_TREE;
+
   while (TREE_CODE (decl) == USING_DECL && !DECL_DEPENDENT_P (decl))
     decl = USING_DECL_DECLS (decl);
   return decl;
@@ -4115,9 +4118,13 @@ qualify_lookup (tree val, int flags)
     return false;
   if ((flags & LOOKUP_PREFER_NAMESPACES) && TREE_CODE (val) == NAMESPACE_DECL)
     return true;
-  if ((flags & LOOKUP_PREFER_TYPES)
-      && (TREE_CODE (val) == TYPE_DECL || TREE_CODE (val) == TEMPLATE_DECL))
+  if (flags & LOOKUP_PREFER_TYPES)
+    {
+      tree target_val = strip_using_decl (val);
+      if (TREE_CODE (target_val) == TYPE_DECL
+	  || TREE_CODE (target_val) == TEMPLATE_DECL)
 	return true;
+    }
   if (flags & (LOOKUP_PREFER_NAMESPACES | LOOKUP_PREFER_TYPES))
     return false;
   /* Look through lambda things that we shouldn't be able to see.  */

gcc/cp/parser.c

@@ -17845,6 +17845,8 @@ cp_parser_class_name (cp_parser *parser,
 	decl = TYPE_NAME (decl);
     }
 
+  decl = strip_using_decl (decl);
+
   /* Check to see that it is really the name of a class.  */
   if (TREE_CODE (decl) == TEMPLATE_ID_EXPR
       && TREE_CODE (TREE_OPERAND (decl, 0)) == IDENTIFIER_NODE

gcc/testsuite/ChangeLog

+2012-04-11  Fabien Chêne  <fabien@gcc.gnu.org>
+
+	PR c++/52465
+	* g++.dg/lookup/using52.C: New.
+
 2012-04-11  Manuel López-Ibáñez  <manu@gcc.gnu.org>
 
 	* lib/prune.exp (TEST_ALWAYS_FLAGS): If undefined, set to empty.

gcc/testsuite/g++.dg/lookup/using52.C

+// { dg-do compile }
+// PR c++/52645
+
+class A
+{
+protected:
+  struct B {};
+};
+
+class C : A
+{
+protected:
+  using A::B;
+
+  struct D : public B {};
+};