win: set CXX_LIBRARY_VERSION to 2011

util/stdlib/string_number_conversion.cc

Index: util/stdlib/string_number_conversion.cc
diff --git a/util/stdlib/string_number_conversion.cc b/util/stdlib/string_number_conversion.cc
index a7c7d519dedfb22bb9332af7685325919fdea42b..585a4f6d7efea43e71a0c95dc0fa375a26da24fd 100644
--- a/util/stdlib/string_number_conversion.cc
+++ b/util/stdlib/string_number_conversion.cc
@@ -28,8 +28,9 @@
 // the C++11 library. If using an older C++ library when compiling C++11 code,
 // the std::numeric_limits<>::min() and max() functions will not be marked as
 // constexpr, and thus won’t be usable with C++11’s static_assert(). In that
-// case, a run-time CHECK() will have to do.
-#if CXX_LIBRARY_VERSION >= 2011
+// case, a run-time CHECK() will have to do. Visual Studio is nominally C++11,
+// but does not fully support constexpr, so fall back to a CHECK.
+#if CXX_LIBRARY_VERSION >= 2011 && !defined(COMPILER_MSVC)

[Mark Mentovai, 2014/12/15 23:33:19]

Maybe we should do this with a CXX_HAS_CONSTEXPR macro in cxx.h.

[scottmg, 2014/12/15 23:38:18]

Done.

 #define CONSTEXPR_STATIC_ASSERT(condition, message) \
   static_assert(condition, message)
 #else