Re-land 714393002 after fixing android build.

sky/engine/wtf/Compiler.h

Index: sky/engine/wtf/Compiler.h
diff --git a/sky/engine/wtf/Compiler.h b/sky/engine/wtf/Compiler.h
index ff35d100894309be4206a14eb08ee00c2c7b6826..8efdaf2e8eb24078edd5635c3e13e8c8ec82fc13 100644
--- a/sky/engine/wtf/Compiler.h
+++ b/sky/engine/wtf/Compiler.h
@@ -29,12 +29,6 @@
 /* COMPILER() - the compiler being used to build the project */
 #define COMPILER(WTF_FEATURE) (defined WTF_COMPILER_##WTF_FEATURE  && WTF_COMPILER_##WTF_FEATURE)
 
-/* COMPILER_SUPPORTS() - whether the compiler being used to build the project supports the given feature. */
-#define COMPILER_SUPPORTS(WTF_COMPILER_FEATURE) (defined WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE  && WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE)
-
-/* COMPILER_QUIRK() - whether the compiler being used to build the project requires a given quirk. */
-#define COMPILER_QUIRK(WTF_COMPILER_QUIRK) (defined WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK  && WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK)
-
 /* ==== COMPILER() - the compiler being used to build the project ==== */
 
 /* COMPILER(CLANG) - Clang  */
@@ -42,45 +36,12 @@
 #define WTF_COMPILER_CLANG 1
 
 #define CLANG_PRAGMA(PRAGMA) _Pragma(PRAGMA)
-
-/* Specific compiler features */
-#define WTF_COMPILER_SUPPORTS_CXX_VARIADIC_TEMPLATES __has_extension(cxx_variadic_templates)
-
-/* There is a bug in clang that comes with Xcode 4.2 where AtomicStrings can't be implicitly converted to Strings
-   in the presence of move constructors and/or move assignment operators. This bug has been fixed in Xcode 4.3 clang, so we
-   check for both cxx_rvalue_references as well as the unrelated cxx_nonstatic_member_init feature which we know was added in 4.3 */
-#define WTF_COMPILER_SUPPORTS_CXX_RVALUE_REFERENCES __has_extension(cxx_rvalue_references) && __has_extension(cxx_nonstatic_member_init)
-
-#define WTF_COMPILER_SUPPORTS_CXX_NULLPTR __has_feature(cxx_nullptr)
-#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)
-#define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS __has_extension(cxx_strong_enums)
-
 #endif
 
 #ifndef CLANG_PRAGMA
 #define CLANG_PRAGMA(PRAGMA)
 #endif
 
-/* COMPILER(MSVC) - Microsoft Visual C++ */
-#if defined(_MSC_VER)
-#define WTF_COMPILER_MSVC 1
-
-/* Specific compiler features */
-#if !COMPILER(CLANG) && _MSC_VER >= 1600
-#define WTF_COMPILER_SUPPORTS_CXX_NULLPTR 1
-#endif
-
-#if COMPILER(CLANG)
-/* Keep strong enums turned off when building with clang-cl: We cannot yet build all of Blink without fallback to cl.exe, and strong enums are exposed at ABI boundaries. */
-#undef WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS
-#endif
-
-#endif
-
 /* COMPILER(GCC) - GNU Compiler Collection */
 #if defined(__GNUC__)
 #define WTF_COMPILER_GCC 1
@@ -91,40 +52,14 @@
 #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_RVALUE_REFERENCES 1
-#define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT 1
-#define WTF_COMPILER_SUPPORTS_CXX_VARIADIC_TEMPLATES 1
-#endif
-#if GCC_VERSION_AT_LEAST(4, 5, 0)
-#define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS 1
-#endif
-#if GCC_VERSION_AT_LEAST(4, 6, 0)
-#define WTF_COMPILER_SUPPORTS_CXX_NULLPTR 1
-/* Strong enums should work from gcc 4.4, but doesn't seem to support some operators */
-#define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS 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)
+#if COMPILER(GCC) && defined(NDEBUG)
 #define ALWAYS_INLINE inline __attribute__((__always_inline__))
-#elif COMPILER(MSVC) && defined(NDEBUG)
-#define ALWAYS_INLINE __forceinline
 #else
 #define ALWAYS_INLINE inline
 #endif
@@ -136,8 +71,6 @@
 #ifndef NEVER_INLINE
 #if COMPILER(GCC)
 #define NEVER_INLINE __attribute__((__noinline__))
-#elif COMPILER(MSVC)
-#define NEVER_INLINE __declspec(noinline)
 #else
 #define NEVER_INLINE
 #endif
@@ -172,8 +105,6 @@
 #ifndef NO_RETURN
 #if COMPILER(GCC)
 #define NO_RETURN __attribute((__noreturn__))
-#elif COMPILER(MSVC)
-#define NO_RETURN __declspec(noreturn)
 #else
 #define NO_RETURN
 #endif
@@ -209,24 +140,10 @@
 #endif
 #endif
 
-/* OBJC_CLASS */
-
-#ifndef OBJC_CLASS
-#ifdef __OBJC__
-#define OBJC_CLASS @class
-#else
-#define OBJC_CLASS class
-#endif
-#endif
-
 /* WTF_PRETTY_FUNCTION */
 
 #if COMPILER(GCC)
-#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