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 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 #ifndef BASE_COMPILER_SPECIFIC_H_

 #define BASE_COMPILER_SPECIFIC_H_

 #include "build/build_config.h"

 #if defined(COMPILER_MSVC)

 // Macros for suppressing and disabling warnings on MSVC.

 //

 // Warning numbers are enumerated at:

 // http://msdn.microsoft.com/en-us/library/8x5x43k7(VS.80).aspx

 //

 // The warning pragma:

 // http://msdn.microsoft.com/en-us/library/2c8f766e(VS.80).aspx

 //

 // Using __pragma instead of #pragma inside macros:

 // http://msdn.microsoft.com/en-us/library/d9x1s805.aspx

 // MSVC_SUPPRESS_WARNING disables warning |n| for the remainder of the line and

 // for the next line of the source file.

 #define MSVC_SUPPRESS_WARNING(n) __pragma(warning(suppress:n))

 // MSVC_PUSH_DISABLE_WARNING pushes |n| onto a stack of warnings to be disabled.

 // The warning remains disabled until popped by MSVC_POP_WARNING.

 #define MSVC_PUSH_DISABLE_WARNING(n) __pragma(warning(push)) \

                                      __pragma(warning(disable:n))

 // MSVC_PUSH_WARNING_LEVEL pushes |n| as the global warning level.  The level

 // remains in effect until popped by MSVC_POP_WARNING().  Use 0 to disable all

 // warnings.

 #define MSVC_PUSH_WARNING_LEVEL(n) __pragma(warning(push, n))

 // Pop effects of innermost MSVC_PUSH_* macro.

 #define MSVC_POP_WARNING() __pragma(warning(pop))

 #define MSVC_DISABLE_OPTIMIZE() __pragma(optimize("", off))

 #define MSVC_ENABLE_OPTIMIZE() __pragma(optimize("", on))

 // Allows |this| to be passed as an argument in constructor initializer lists.

 // This uses push/pop instead of the seemingly simpler suppress feature to avoid

 // having the warning be disabled for more than just |code|.

 //

 // Example usage:

 // Foo::Foo() : x(NULL), ALLOW_THIS_IN_INITIALIZER_LIST(y(this)), z(3) {}

 //

 // Compiler warning C4355: 'this': used in base member initializer list:

 // http://msdn.microsoft.com/en-us/library/3c594ae3(VS.80).aspx

 #define ALLOW_THIS_IN_INITIALIZER_LIST(code) MSVC_PUSH_DISABLE_WARNING(4355) \

                                              code \

                                              MSVC_POP_WARNING()

 #else  // Not MSVC

 #define MSVC_SUPPRESS_WARNING(n)

 #define MSVC_PUSH_DISABLE_WARNING(n)

 #define MSVC_PUSH_WARNING_LEVEL(n)

 #define MSVC_POP_WARNING()

 #define MSVC_DISABLE_OPTIMIZE()

 #define MSVC_ENABLE_OPTIMIZE()

 #define ALLOW_THIS_IN_INITIALIZER_LIST(code) code

 #endif  // COMPILER_MSVC

 #if defined(COMPILER_GCC)

 #define ALLOW_UNUSED __attribute__((unused))

 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result))

 #else  // Not GCC

 #define ALLOW_UNUSED

 #define WARN_UNUSED_RESULT

 #endif

 #endif  // BASE_COMPILER_SPECIFIC_H_