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 71 #define ALLOW_UNUSED __attribute__((unused)) 72 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) 73 74 // Tell the compiler a function is using a printf-style format string. 75 // |format_param| is the one-based index of the format string parameter; 76 // |dots_param| is the one-based index of the "..." parameter. 77 // For v*printf functions (which take a va_list), pass 0 for dots_param. 78 // (This is undocumented but matches what the system C headers do.) 79 #define PRINTF_FORMAT(format_param, dots_param) \ 80 __attribute__((format(printf, format_param, dots_param))) 81 82 // WPRINTF_FORMAT is the same, but for wide format strings. 83 // This doesn't appear to yet be implemented. 84 // See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38308 . 85 #define WPRINTF_FORMAT(format_param, dots_param) 86 // If available, it would look like: 87 // __attribute__((format(wprintf, format_param, dots_param))) 88 89 #else // Not GCC 90 91 #define ALLOW_UNUSED 92 #define WARN_UNUSED_RESULT 93 #define PRINTF_FORMAT(x, y) 94 #define WPRINTF_FORMAT(x, y) 95 96 #endif 97 98 #endif // BASE_COMPILER_SPECIFIC_H_ 99
