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