Remove GCC C++03 fallbacks for decltype and static_assert.
This means libc++ no longer needs to write extra braces in
static asserts: Ex `static_assert((is_same_v<T, V>), "msg")`.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@363738 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__config b/include/__config
index f68baa3..3efd1a7 100644
--- a/include/__config
+++ b/include/__config
@@ -413,10 +413,6 @@
#define _LIBCPP_HAS_NO_STRONG_ENUMS
#endif
-#if !(__has_feature(cxx_decltype))
-#define _LIBCPP_HAS_NO_DECLTYPE
-#endif
-
#if __has_feature(cxx_attributes)
# define _LIBCPP_NORETURN [[noreturn]]
#else
@@ -548,7 +544,6 @@
#ifndef __GXX_EXPERIMENTAL_CXX0X__
#define _LIBCPP_HAS_NO_CONSTEXPR
-#define _LIBCPP_HAS_NO_DECLTYPE
#define _LIBCPP_HAS_NO_NULLPTR
#define _LIBCPP_HAS_NO_UNICODE_CHARS
#define _LIBCPP_HAS_NO_VARIADICS
@@ -853,29 +848,10 @@
#endif
#ifdef _LIBCPP_CXX03_LANG
-# if __has_extension(c_static_assert)
-# define static_assert(__b, __m) _Static_assert(__b, __m)
-# else
-extern "C++" {
-template <bool> struct __static_assert_test;
-template <> struct __static_assert_test<true> {};
-template <unsigned> struct __static_assert_check {};
-}
-# define static_assert(__b, __m) \
- typedef __static_assert_check<sizeof(__static_assert_test<(__b)>)> \
- _LIBCPP_CONCAT(__t, __LINE__)
-# endif // __has_extension(c_static_assert)
+# define static_assert(...) _Static_assert(__VA_ARGS__)
+# define decltype(...) __decltype(__VA_ARGS__)
#endif // _LIBCPP_CXX03_LANG
-#ifdef _LIBCPP_HAS_NO_DECLTYPE
-// GCC 4.6 provides __decltype in all standard modes.
-# if __has_keyword(__decltype) || _LIBCPP_CLANG_VER >= 304 || defined(_LIBCPP_COMPILER_GCC)
-# define decltype(__x) __decltype(__x)
-# else
-# define decltype(__x) __typeof__(__x)
-# endif
-#endif
-
#ifdef _LIBCPP_HAS_NO_CONSTEXPR
# define _LIBCPP_CONSTEXPR
#else
