re PR c++/33486 (namespace association doesn't handle parallel namespaces)

* gcc/cp/parser.c (cp_parser_declaration): Handle 'inline namespace'.
        (cp_parser_namespace_definition): Likewise.
  
        PR c++/33486
        * gcc/cp/name-lookup.c (arg_assoc_namespace): Look down into inline
        namespaces, too.
  
        * libstdc++-v3/include/bits/c++config: Use 'inline namespace'
        instead of strong using.

From-SVN: r132611

gcc/cp/ChangeLog

@@ -1,3 +1,12 @@
+2008-02-24  Jason Merrill  <jason@redhat.com>
+
+	* parser.c (cp_parser_declaration): Handle "inline namespace".
+	(cp_parser_namespace_definition): Likewise.
+
+	PR c++/33486
+	* name-lookup.c (arg_assoc_namespace): Look down into inline 
+	namespaces, too.
+
 2008-02-23  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
 
 	* typeck.c (check_for_casting_away_constness): Use 1 single

gcc/cp/name-lookup.c

@@ -4419,6 +4419,13 @@ arg_assoc_namespace (struct arg_lookup *k, tree scope)
     if (arg_assoc_namespace (k, TREE_PURPOSE (value)))
       return true;
 
+  /* Also look down into inline namespaces.  */
+  for (value = DECL_NAMESPACE_USING (scope); value;
+       value = TREE_CHAIN (value))
+    if (is_associated_namespace (scope, TREE_PURPOSE (value)))
+      if (arg_assoc_namespace (k, TREE_PURPOSE (value)))
+	return true;
+
   value = namespace_binding (k->name, scope);
   if (!value)
     return false;

gcc/cp/parser.c

@@ -7737,6 +7737,10 @@ cp_parser_declaration (cp_parser* parser)
 	       || token2.type == CPP_OPEN_BRACE
 	       || token2.keyword == RID_ATTRIBUTE))
     cp_parser_namespace_definition (parser);
+  /* An inline (associated) namespace definition.  */
+  else if (token1.keyword == RID_INLINE
+	   && token2.keyword == RID_NAMESPACE)
+    cp_parser_namespace_definition (parser);
   /* Objective-C++ declaration/definition.  */
   else if (c_dialect_objc () && OBJC_IS_AT_KEYWORD (token1.keyword))
     cp_parser_objc_declaration (parser);
@@ -11562,6 +11566,15 @@ cp_parser_namespace_definition (cp_parser* parser)
 {
   tree identifier, attribs;
   bool has_visibility;
+  bool is_inline;
+
+  if (cp_lexer_next_token_is_keyword (parser->lexer, RID_INLINE))
+    {
+      is_inline = true;
+      cp_lexer_consume_token (parser->lexer);
+    }
+  else
+    is_inline = false;
 
   /* Look for the `namespace' keyword.  */
   cp_parser_require_keyword (parser, RID_NAMESPACE, "`namespace'");
@@ -11583,6 +11596,21 @@ cp_parser_namespace_definition (cp_parser* parser)
   /* Start the namespace.  */
   push_namespace (identifier);
 
+  /* "inline namespace" is equivalent to a stub namespace definition
+     followed by a strong using directive.  */
+  if (is_inline)
+    {
+      tree namespace = current_namespace;
+      /* Set up namespace association.  */
+      DECL_NAMESPACE_ASSOCIATIONS (namespace)
+	= tree_cons (CP_DECL_CONTEXT (namespace), NULL_TREE,
+		     DECL_NAMESPACE_ASSOCIATIONS (namespace));
+      /* Import the contents of the inline namespace.  */
+      pop_namespace ();
+      do_using_directive (namespace);
+      push_namespace (identifier);
+    }
+
   has_visibility = handle_namespace_attrs (current_namespace, attribs);
 
   /* Parse the body of the namespace.  */

gcc/testsuite/g++.dg/lookup/strong-using-1.C

@@ -3,10 +3,9 @@
 // { dg-do compile }
 
 namespace fool {
-  namespace foo {
+  inline namespace foo {
     template <class T> void swap(T, T);
   }
-  using namespace foo __attribute__((strong));
   template <class T> void swap(T);
 }
 

gcc/testsuite/g++.dg/lookup/strong-using-2.C

@@ -3,16 +3,14 @@
 // { dg-do compile }
 
 namespace foo {
-  namespace foo_impl {
+  inline namespace foo_impl {
     class T; // { dg-error "T" "" }
   }
-  using namespace foo_impl __attribute__((strong));
 }
 namespace bar {
-  namespace bar_impl {
+  inline namespace bar_impl {
     class T; // { dg-error "T" "" }
   }
-  using namespace bar_impl __attribute__((strong));
   using namespace foo;
 }
 namespace baz {

gcc/testsuite/g++.dg/lookup/strong-using-3.C

@@ -3,10 +3,9 @@
 // { dg-do compile }
 
 namespace bar {
-  namespace foo {
+  inline namespace foo {
     template <class T> void f(T, T);
   }
-  using namespace foo __attribute__((strong));
   template <class T> void f(T);
 }
 

gcc/testsuite/g++.dg/lookup/strong-using-5.C

@@ -0,0 +1,24 @@
+// PR c++/33486
+
+namespace A
+{
+  inline namespace B
+  {
+    struct T
+    {
+      struct U { };
+      U f();
+    };
+  }
+
+  inline namespace C
+  {
+    void g (T::U);
+  }
+}
+
+int main()
+{
+  A::T t;
+  g(t.f());
+}

libstdc++-v3/ChangeLog

@@ -1,3 +1,8 @@
+2008-02-20  Jason Merrill  <jason@redhat.com>
+
+	* include/bits/c++config: Use 'inline namespace' instead of 
+	strong using.
+
 2008-02-18  Pedro Lamarao <pedro.lamarao@mndfck.org>
 
 	* include/std/tuple: Fixes for moveable, non-copyable types.

libstdc++-v3/include/bits/c++config

@@ -180,11 +180,8 @@
 namespace std
 { 
   namespace __norm { } 
-  namespace __debug { }
-  namespace __cxx1998 { }
-
-  using namespace __debug __attribute__ ((strong)); 
-  using namespace __cxx1998 __attribute__ ((strong)); 
+  inline namespace __debug { }
+  inline namespace __cxx1998 { }
 }
 #endif
 
@@ -193,11 +190,8 @@ namespace std
 namespace std
 { 
   namespace __norm { } 
-  namespace __parallel { }
-  namespace __cxx1998 { }
-
-  using namespace __parallel __attribute__ ((strong));
-  using namespace __cxx1998 __attribute__ ((strong)); 
+  inline namespace __parallel { }
+  inline namespace __cxx1998 { }
 }
 #endif
 
@@ -205,22 +199,19 @@ namespace std
 #if _GLIBCXX_NAMESPACE_ASSOCIATION_VERSION
 namespace std
 {
-  namespace _6 { }
-  using namespace _6 __attribute__ ((strong));
+  inline namespace _6 { }
 }
 
 namespace __gnu_cxx 
 { 
-  namespace _6 { }
-  using namespace _6 __attribute__ ((strong));
+  inline namespace _6 { }
 }
 
 namespace std
 {
   namespace tr1 
   { 
-    namespace _6 { }
-    using namespace _6 __attribute__ ((strong));
+    inline namespace _6 { }
   }
 }
 #endif
@@ -235,8 +226,7 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
 # define _GLIBCXX_LDBL_NAMESPACE __gnu_cxx_ldbl128::
 # define _GLIBCXX_BEGIN_LDBL_NAMESPACE namespace __gnu_cxx_ldbl128 {
 # define _GLIBCXX_END_LDBL_NAMESPACE }
-  namespace __gnu_cxx_ldbl128 { }
-  using namespace __gnu_cxx_ldbl128 __attribute__((__strong__));
+  inline namespace __gnu_cxx_ldbl128 { }
 #else
 # define _GLIBCXX_LDBL_NAMESPACE
 # define _GLIBCXX_BEGIN_LDBL_NAMESPACE