michael@0: // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #ifndef BASE_COMPILER_SPECIFIC_H_
michael@0: #define BASE_COMPILER_SPECIFIC_H_
michael@0: 
michael@0: #include "build/build_config.h"
michael@0: 
michael@0: #if defined(COMPILER_MSVC)
michael@0: 
michael@0: // Macros for suppressing and disabling warnings on MSVC.
michael@0: //
michael@0: // Warning numbers are enumerated at:
michael@0: // http://msdn.microsoft.com/en-us/library/8x5x43k7(VS.80).aspx
michael@0: //
michael@0: // The warning pragma:
michael@0: // http://msdn.microsoft.com/en-us/library/2c8f766e(VS.80).aspx
michael@0: //
michael@0: // Using __pragma instead of #pragma inside macros:
michael@0: // http://msdn.microsoft.com/en-us/library/d9x1s805.aspx
michael@0: 
michael@0: // MSVC_SUPPRESS_WARNING disables warning |n| for the remainder of the line and
michael@0: // for the next line of the source file.
michael@0: #define MSVC_SUPPRESS_WARNING(n) __pragma(warning(suppress:n))
michael@0: 
michael@0: // MSVC_PUSH_DISABLE_WARNING pushes |n| onto a stack of warnings to be disabled.
michael@0: // The warning remains disabled until popped by MSVC_POP_WARNING.
michael@0: #define MSVC_PUSH_DISABLE_WARNING(n) __pragma(warning(push)) \
michael@0:                                      __pragma(warning(disable:n))
michael@0: 
michael@0: // MSVC_PUSH_WARNING_LEVEL pushes |n| as the global warning level.  The level
michael@0: // remains in effect until popped by MSVC_POP_WARNING().  Use 0 to disable all
michael@0: // warnings.
michael@0: #define MSVC_PUSH_WARNING_LEVEL(n) __pragma(warning(push, n))
michael@0: 
michael@0: // Pop effects of innermost MSVC_PUSH_* macro.
michael@0: #define MSVC_POP_WARNING() __pragma(warning(pop))
michael@0: 
michael@0: #define MSVC_DISABLE_OPTIMIZE() __pragma(optimize("", off))
michael@0: #define MSVC_ENABLE_OPTIMIZE() __pragma(optimize("", on))
michael@0: 
michael@0: // Allows |this| to be passed as an argument in constructor initializer lists.
michael@0: // This uses push/pop instead of the seemingly simpler suppress feature to avoid
michael@0: // having the warning be disabled for more than just |code|.
michael@0: //
michael@0: // Example usage:
michael@0: // Foo::Foo() : x(NULL), ALLOW_THIS_IN_INITIALIZER_LIST(y(this)), z(3) {}
michael@0: //
michael@0: // Compiler warning C4355: 'this': used in base member initializer list:
michael@0: // http://msdn.microsoft.com/en-us/library/3c594ae3(VS.80).aspx
michael@0: #define ALLOW_THIS_IN_INITIALIZER_LIST(code) MSVC_PUSH_DISABLE_WARNING(4355) \
michael@0:                                              code \
michael@0:                                              MSVC_POP_WARNING()
michael@0: 
michael@0: #else  // Not MSVC
michael@0: 
michael@0: #define MSVC_SUPPRESS_WARNING(n)
michael@0: #define MSVC_PUSH_DISABLE_WARNING(n)
michael@0: #define MSVC_PUSH_WARNING_LEVEL(n)
michael@0: #define MSVC_POP_WARNING()
michael@0: #define MSVC_DISABLE_OPTIMIZE()
michael@0: #define MSVC_ENABLE_OPTIMIZE()
michael@0: #define ALLOW_THIS_IN_INITIALIZER_LIST(code) code
michael@0: 
michael@0: #endif  // COMPILER_MSVC
michael@0: 
michael@0: 
michael@0: #if defined(COMPILER_GCC)
michael@0: #define ALLOW_UNUSED __attribute__((unused))
michael@0: #define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
michael@0: #else  // Not GCC
michael@0: #define ALLOW_UNUSED
michael@0: #define WARN_UNUSED_RESULT
michael@0: #endif
michael@0: 
michael@0: #endif  // BASE_COMPILER_SPECIFIC_H_