1// Copyright 2014 the V8 project authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef V8_BASE_COMPILER_SPECIFIC_H_ 6#define V8_BASE_COMPILER_SPECIFIC_H_ 7 8#include "include/v8config.h" 9 10// Annotate a typedef or function indicating it's ok if it's not used. 11// Use like: 12// typedef Foo Bar ALLOW_UNUSED_TYPE; 13#if V8_HAS_ATTRIBUTE_UNUSED 14#define ALLOW_UNUSED_TYPE __attribute__((unused)) 15#else 16#define ALLOW_UNUSED_TYPE 17#endif 18 19 20// Annotate a function indicating the caller must examine the return value. 21// Use like: 22// int foo() WARN_UNUSED_RESULT; 23#if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT 24#define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) 25#else 26#define WARN_UNUSED_RESULT /* NOT SUPPORTED */ 27#endif 28 29 30// The C++ standard requires that static const members have an out-of-class 31// definition (in a single compilation unit), but MSVC chokes on this (when 32// language extensions, which are required, are enabled). (You're only likely to 33// notice the need for a definition if you take the address of the member or, 34// more commonly, pass it to a function that takes it as a reference argument -- 35// probably an STL function.) This macro makes MSVC do the right thing. See 36// http://msdn.microsoft.com/en-us/library/34h23df8(v=vs.100).aspx for more 37// information. Use like: 38// 39// In .h file: 40// struct Foo { 41// static const int kBar = 5; 42// }; 43// 44// In .cc file: 45// STATIC_CONST_MEMBER_DEFINITION const int Foo::kBar; 46#if V8_HAS_DECLSPEC_SELECTANY 47#define STATIC_CONST_MEMBER_DEFINITION __declspec(selectany) 48#else 49#define STATIC_CONST_MEMBER_DEFINITION 50#endif 51 52#endif // V8_BASE_COMPILER_SPECIFIC_H_ 53