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