c++config: Guard _LDBL_ macros with __cplusplus.

2008-04-14  Benjamin Kosnik  <bkoz@redhat.com>

	* include/bits/c++config: Guard _LDBL_ macros with __cplusplus.

From-SVN: r134288

libstdc++-v3/ChangeLog

+2008-04-14  Benjamin Kosnik  <bkoz@redhat.com>
+
+	* include/bits/c++config: Guard _LDBL_ macros with __cplusplus.
+	
 2008-04-10  Benjamin Kosnik  <bkoz@redhat.com>
 
 	* doc/html/*: Regenerate.

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

@@ -236,7 +236,8 @@ namespace std
 // XXX GLIBCXX_ABI Deprecated
 // Namespace associations for long double 128 mode.
 _GLIBCXX_BEGIN_NAMESPACE(std)
-#if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__
+#if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__ \
+  && defined __cplusplus
 # define _GLIBCXX_LDBL_NAMESPACE __gnu_cxx_ldbl128::
 # define _GLIBCXX_BEGIN_LDBL_NAMESPACE namespace __gnu_cxx_ldbl128 {
 # define _GLIBCXX_END_LDBL_NAMESPACE }