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comparison: ipc/chromium/src/base/compiler_specific.h
ipc/chromium/src/base/compiler_specific.h
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| 1 // Copyright (c) 2006-2008 The Chromium 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 BASE_COMPILER_SPECIFIC_H_ | |
| 6 #define BASE_COMPILER_SPECIFIC_H_ | |
| 7 | |
| 8 #include "build/build_config.h" | |
| 9 | |
| 10 #if defined(COMPILER_MSVC) | |
| 11 | |
| 12 // Macros for suppressing and disabling warnings on MSVC. | |
| 13 // | |
| 14 // Warning numbers are enumerated at: | |
| 15 // http://msdn.microsoft.com/en-us/library/8x5x43k7(VS.80).aspx | |
| 16 // | |
| 17 // The warning pragma: | |
| 18 // http://msdn.microsoft.com/en-us/library/2c8f766e(VS.80).aspx | |
| 19 // | |
| 20 // Using __pragma instead of #pragma inside macros: | |
| 21 // http://msdn.microsoft.com/en-us/library/d9x1s805.aspx | |
| 22 | |
| 23 // MSVC_SUPPRESS_WARNING disables warning |n| for the remainder of the line and | |
| 24 // for the next line of the source file. | |
| 25 #define MSVC_SUPPRESS_WARNING(n) __pragma(warning(suppress:n)) | |
| 26 | |
| 27 // MSVC_PUSH_DISABLE_WARNING pushes |n| onto a stack of warnings to be disabled. | |
| 28 // The warning remains disabled until popped by MSVC_POP_WARNING. | |
| 29 #define MSVC_PUSH_DISABLE_WARNING(n) __pragma(warning(push)) \ | |
| 30 __pragma(warning(disable:n)) | |
| 31 | |
| 32 // MSVC_PUSH_WARNING_LEVEL pushes |n| as the global warning level. The level | |
| 33 // remains in effect until popped by MSVC_POP_WARNING(). Use 0 to disable all | |
| 34 // warnings. | |
| 35 #define MSVC_PUSH_WARNING_LEVEL(n) __pragma(warning(push, n)) | |
| 36 | |
| 37 // Pop effects of innermost MSVC_PUSH_* macro. | |
| 38 #define MSVC_POP_WARNING() __pragma(warning(pop)) | |
| 39 | |
| 40 #define MSVC_DISABLE_OPTIMIZE() __pragma(optimize("", off)) | |
| 41 #define MSVC_ENABLE_OPTIMIZE() __pragma(optimize("", on)) | |
| 42 | |
| 43 // Allows |this| to be passed as an argument in constructor initializer lists. | |
| 44 // This uses push/pop instead of the seemingly simpler suppress feature to avoid | |
| 45 // having the warning be disabled for more than just |code|. | |
| 46 // | |
| 47 // Example usage: | |
| 48 // Foo::Foo() : x(NULL), ALLOW_THIS_IN_INITIALIZER_LIST(y(this)), z(3) {} | |
| 49 // | |
| 50 // Compiler warning C4355: 'this': used in base member initializer list: | |
| 51 // http://msdn.microsoft.com/en-us/library/3c594ae3(VS.80).aspx | |
| 52 #define ALLOW_THIS_IN_INITIALIZER_LIST(code) MSVC_PUSH_DISABLE_WARNING(4355) \ | |
| 53 code \ | |
| 54 MSVC_POP_WARNING() | |
| 55 | |
| 56 #else // Not MSVC | |
| 57 | |
| 58 #define MSVC_SUPPRESS_WARNING(n) | |
| 59 #define MSVC_PUSH_DISABLE_WARNING(n) | |
| 60 #define MSVC_PUSH_WARNING_LEVEL(n) | |
| 61 #define MSVC_POP_WARNING() | |
| 62 #define MSVC_DISABLE_OPTIMIZE() | |
| 63 #define MSVC_ENABLE_OPTIMIZE() | |
| 64 #define ALLOW_THIS_IN_INITIALIZER_LIST(code) code | |
| 65 | |
| 66 #endif // COMPILER_MSVC | |
| 67 | |
| 68 | |
| 69 #if defined(COMPILER_GCC) | |
| 70 #define ALLOW_UNUSED __attribute__((unused)) | |
| 71 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) | |
| 72 #else // Not GCC | |
| 73 #define ALLOW_UNUSED | |
| 74 #define WARN_UNUSED_RESULT | |
| 75 #endif | |
| 76 | |
| 77 #endif // BASE_COMPILER_SPECIFIC_H_ |
