c++config: inline __cxx11 namespace within namespace __cxx1998.

2014-12-20  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/c++config: inline __cxx11 namespace within namespace
	__cxx1998.

From-SVN: r218988

libstdc++-v3/ChangeLog

+2014-12-20  François Dumont  <fdumont@gcc.gnu.org>
+
+	* include/bits/c++config: inline __cxx11 namespace within namespace
+	__cxx1998.
+
 2014-12-20  Jonathan Wakely  <jwakely@redhat.com>
 
 	* src/c++98/locale-inst.cc (__add_grouping, __pad, __int_to_char):

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

@@ -277,9 +277,13 @@ namespace std
   // Non-inline namespace for components replaced by alternates in active mode.
   namespace __cxx1998
   {
-#if _GLIBCXX_INLINE_VERSION
- inline namespace __7 { }
-#endif
+# if _GLIBCXX_INLINE_VERSION
+  inline namespace __7 { }
+# endif
+
+# if _GLIBCXX_USE_CXX11_ABI
+  inline namespace __cxx11 __attribute__((abi_tag)) { }
+# endif
   }
 
   // Inline namespace for debug mode.