just use c++ static_assert everywhere

Source/wtf/Compiler.h

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
 /* COMPILER(CLANG) - Clang  */
 #if defined(__clang__)
 #define WTF_COMPILER_CLANG 1
 
 #define CLANG_PRAGMA(PRAGMA) _Pragma(PRAGMA)
 
 /* Specific compiler features */
 
 #define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS __has_feature(cxx_explicit_conversions)
 #define WTF_COMPILER_SUPPORTS_BLOCKS __has_feature(blocks)
-#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT __has_extension(c_static_assert)
-#define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT __has_extension(cxx_static_assert)
 #define WTF_COMPILER_SUPPORTS_HAS_TRIVIAL_DESTRUCTOR __has_extension(has_trivial_destructor)
 
 #endif
 
 #ifndef CLANG_PRAGMA
 #define CLANG_PRAGMA(PRAGMA)
 #endif
 
 /* COMPILER(MSVC) - Microsoft Visual C++ */
 #if defined(_MSC_VER)
 #define WTF_COMPILER_MSVC 1
 #endif
 
 /* COMPILER(GCC) - GNU Compiler Collection */
 #if defined(__GNUC__)
 #define WTF_COMPILER_GCC 1
 #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
 #define GCC_VERSION_AT_LEAST(major, minor, patch) (GCC_VERSION >= (major * 10000 + minor * 100 + patch))
 #else
 /* Define this for !GCC compilers, just so we can write things like GCC_VERSION_AT_LEAST(4, 1, 0). */
 #define GCC_VERSION_AT_LEAST(major, minor, patch) 0
 #endif
 
 /* Specific compiler features */
 #if COMPILER(GCC) && !COMPILER(CLANG)
-#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
-/* C11 support */
-#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT 1
-#endif
-#if defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined(__cplusplus) && __cplusplus >= 201103L)
-/* C++11 support */
-#if GCC_VERSION_AT_LEAST(4, 3, 0)
-#define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT 1
-#endif
-#if GCC_VERSION_AT_LEAST(4, 5, 0)
 #define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS 1
-#endif
-#endif /* defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined(__cplusplus) && __cplusplus >= 201103L) */
 #endif /* COMPILER(GCC) */
 
 /* ==== Compiler features ==== */
 
 
 /* ALWAYS_INLINE */
 
 #ifndef ALWAYS_INLINE
 #if COMPILER(GCC) && defined(NDEBUG) && !COMPILER(MINGW)
 #define ALWAYS_INLINE inline __attribute__((__always_inline__))
@@ skipping 94 matching lines @@
 #define WTF_COMPILER_SUPPORTS_PRETTY_FUNCTION 1
 #define WTF_PRETTY_FUNCTION __PRETTY_FUNCTION__
 #elif COMPILER(MSVC)
 #define WTF_COMPILER_SUPPORTS_PRETTY_FUNCTION 1
 #define WTF_PRETTY_FUNCTION __FUNCSIG__
 #else
 #define WTF_PRETTY_FUNCTION __FUNCTION__
 #endif
 
 #endif /* WTF_Compiler_h */