[libcxx] r181347 - Introduce _LIBCPP_STD_VER. This can be set by the client (or the clang driver). Or it will be defaulted. The default is 11 if -std= c++11 or eariler, else it will default to the current year modulo the century. We anticipate it defaulting to 14 for C++14 when the time comes. For now, post-C++11 libcxx implementations should protect themselves with #if _LIBCPP_STD_VER > 11.

[Howard Hinnant]

Author: hhinnant
Date: Tue May  7 15:16:13 2013
New Revision: 181347

URL: http://llvm.org/viewvc/llvm-project?rev=181347&view=rev
Log:
Introduce _LIBCPP_STD_VER.  This can be set by the client (or the clang driver).  Or it will be defaulted.  The default is 11 if -std= c++11 or eariler, else it will default to the current year modulo the century.  We anticipate it defaulting to 14 for C++14 when the time comes.  For now, post-C++11 libcxx implementations should protect themselves with #if _LIBCPP_STD_VER > 11.

Modified:
    libcxx/trunk/include/__config

Modified: libcxx/trunk/include/__config
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/__config?rev=181347&r1=181346&r2=181347&view=diff
==============================================================================
--- libcxx/trunk/include/__config (original)
+++ libcxx/trunk/include/__config Tue May  7 15:16:13 2013
@@ -488,6 +488,14 @@ template <unsigned> struct __static_asse
 #   endif
 #endif
 
+#ifndef _LIBCPP_STD_VER
+#  if  __cplusplus <= 201103L
+#    define _LIBCPP_STD_VER 11
+#  else
+#    define _LIBCPP_STD_VER 13  // current year, or date of c++14 ratification
+#  endif
+#endif  // _LIBCPP_STD_VER
+
 #ifdef _LIBCPP_DEBUG2
 #   include <__debug>
 #else