base/compiler_specific.h - Issue 1866473002: Define HAS_FEATURE instead of __has_feature

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Side by Side Diff: base/compiler_specific.h

Issue 1866473002: Define HAS_FEATURE instead of __has_feature (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Keep Mac as-is. Created 4 years, 8 months ago

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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.	1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.

2 // Use of this source code is governed by a BSD-style license that can be	2 // Use of this source code is governed by a BSD-style license that can be

3 // found in the LICENSE file.	3 // found in the LICENSE file.

4	4

5 #ifndef BASE_COMPILER_SPECIFIC_H_	5 #ifndef BASE_COMPILER_SPECIFIC_H_

6 #define BASE_COMPILER_SPECIFIC_H_	6 #define BASE_COMPILER_SPECIFIC_H_

7	7

8 #include "build/build_config.h"	8 #include "build/build_config.h"

9	9

10 #if defined(COMPILER_MSVC)	10 #if defined(COMPILER_MSVC)

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181 // Macro for hinting that an expression is likely to be false.	181 // Macro for hinting that an expression is likely to be false.

182 #if !defined(UNLIKELY)	182 #if !defined(UNLIKELY)

183 #if defined(COMPILER_GCC)	183 #if defined(COMPILER_GCC)

184 #define UNLIKELY(x) __builtin_expect(!!(x), 0)	184 #define UNLIKELY(x) __builtin_expect(!!(x), 0)

185 #else	185 #else

186 #define UNLIKELY(x) (x)	186 #define UNLIKELY(x) (x)

187 #endif // defined(COMPILER_GCC)	187 #endif // defined(COMPILER_GCC)

188 #endif // !defined(UNLIKELY)	188 #endif // !defined(UNLIKELY)

189	189

190 // Compiler feature-detection.	190 // Compiler feature-detection.

191 // http://clang.llvm.org/docs/LanguageExtensions.html	191 // clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension

192 #if !defined(__has_feature)	192 #if defined(__has_feature)

193 #define __has_feature(FEATURE) 0	193 #define HAS_FEATURE(FEATURE) __has_feature(FEATURE)

	194 #else

	195 #define HAS_FEATURE(FEATURE) 0

194 #endif	196 #endif

195	197

196 #endif // BASE_COMPILER_SPECIFIC_H_	198 #endif // BASE_COMPILER_SPECIFIC_H_

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