Fix context handling of alias-declaration

gcc/cp/

	* decl.c (start_decl): Update comment.
	* error.c (dump_alias_template_specialization): Dump the context
	of the specialization.
	* parser.c (cp_parser_alias_declaration): Call pop_scope on the
	pushed scope yielded by start_decl.

gcc/testsuite

	* g++.dg/cpp0x/alias-decl-11.C: New test.

From-SVN: r181152

gcc/cp/ChangeLog

@@ -1,3 +1,12 @@
+2011-11-08  Dodji Seketeli  <dodji@redhat.com>
+
+	Fix context handling of alias-declaration
+	* decl.c (start_decl): Update comment.
+	* error.c (dump_alias_template_specialization): Dump the context
+	of the specialization.
+	* parser.c (cp_parser_alias_declaration): Call pop_scope on the
+	pushed scope yielded by start_decl.
+
 2011-11-08  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/50864

gcc/cp/decl.c

@@ -4295,8 +4295,11 @@ groktypename (cp_decl_specifier_seq *type_specifiers,
    deleted function, but 0 (SD_UNINITIALIZED) if this is a variable
    implicitly initialized via a default constructor.  ATTRIBUTES and
    PREFIX_ATTRIBUTES are GNU attributes associated with this declaration.
-   *PUSHED_SCOPE_P is set to the scope entered in this function, if any; if
-   set, the caller is responsible for calling pop_scope.  */
+
+   The scope represented by the context of the returned DECL is pushed
+   (if it is not the global namespace) and is assigned to
+   *PUSHED_SCOPE_P.  The caller is then responsible for calling
+   pop_scope on *PUSHED_SCOPE_P if it is set.  */
 
 tree
 start_decl (const cp_declarator *declarator,

gcc/cp/error.c

@@ -341,6 +341,8 @@ dump_alias_template_specialization (tree t, int flags)
 
   gcc_assert (alias_template_specialization_p (t));
 
+  if (!(flags & TFF_UNQUALIFIED_NAME))
+    dump_scope (CP_DECL_CONTEXT (TYPE_NAME (t)), flags);
   name = TYPE_IDENTIFIER (t);
   pp_cxx_tree_identifier (cxx_pp, name);
   dump_template_parms (TYPE_TEMPLATE_INFO (t),

gcc/cp/parser.c

@@ -14891,7 +14891,7 @@ cp_parser_using_declaration (cp_parser* parser,
 static tree
 cp_parser_alias_declaration (cp_parser* parser)
 {
-  tree id, type, decl, dummy, attributes;
+  tree id, type, decl, pushed_scope = NULL_TREE, attributes;
   location_t id_location;
   cp_declarator *declarator;
   cp_decl_specifier_seq decl_specs;
@@ -14925,12 +14925,15 @@ cp_parser_alias_declaration (cp_parser* parser)
 		      NULL_TREE, attributes);
   else
     decl = start_decl (declarator, &decl_specs, 0,
-		       attributes, NULL_TREE, &dummy);
+		       attributes, NULL_TREE, &pushed_scope);
   if (decl == error_mark_node)
     return decl;
 
   cp_finish_decl (decl, NULL_TREE, 0, NULL_TREE, 0);
 
+  if (pushed_scope)
+    pop_scope (pushed_scope);
+
   /* If decl is a template, return its TEMPLATE_DECL so that it gets
      added into the symbol table; otherwise, return the TYPE_DECL.  */
   if (DECL_LANG_SPECIFIC (decl)

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2011-11-08  Dodji Seketeli  <dodji@redhat.com>
+
+	Fix context handling of alias-declaration
+	* g++.dg/cpp0x/alias-decl-11.C: New test.
+
 2011-11-08  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/50864

gcc/testsuite/g++.dg/cpp0x/alias-decl-11.C

@@ -0,0 +1,8 @@
+// { dg-options "-std=c++0x" }
+
+namespace N
+{
+  template <class T> using U = T*;
+};
+
+void f(N::U<int>) { blah; } // { dg-error "void f(N::U<int>)|not declared" }