Working the type_traits area: Hooked up to clang's __is_union. Got has_trivial_copy_assign working.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@113162 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__config b/include/__config
index a5a2d1f..87213fc 100644
--- a/include/__config
+++ b/include/__config
@@ -152,6 +152,10 @@
#define _STD std
#endif // __has_feature(cxx_inline_namespaces)
+#if !(__has_feature(cxx_constexpr))
+#define _LIBCPP_HAS_NO_CONSTEXPR
+#endif
+
// end defined(__clang__)
#elif defined(__GNUC__)
@@ -161,6 +165,7 @@
#endif
#define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
+#define _LIBCPP_HAS_NO_CONSTEXPR
#ifndef __GXX_EXPERIMENTAL_CXX0X__
@@ -231,4 +236,8 @@
#define decltype(x) __typeof__(x)
#endif
+#ifdef _LIBCPP_HAS_NO_CONSTEXPR
+#define constexpr const
+#endif
+
#endif // _LIBCPP_CONFIG