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ffmpeg / libavutil / attributes.h @ a5b13b14

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/*
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 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * Macro definitions for various function/variable attributes
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 */
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#ifndef AVUTIL_ATTRIBUTES_H
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#define AVUTIL_ATTRIBUTES_H
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#ifdef __GNUC__
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#    define AV_GCC_VERSION_AT_LEAST(x,y) (__GNUC__ > x || __GNUC__ == x && __GNUC_MINOR__ >= y)
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#else
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#    define AV_GCC_VERSION_AT_LEAST(x,y) 0
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#endif
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#ifndef av_always_inline
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#if AV_GCC_VERSION_AT_LEAST(3,1)
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#    define av_always_inline __attribute__((always_inline)) inline
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#else
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#    define av_always_inline inline
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#endif
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#endif
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#ifndef av_noinline
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#if AV_GCC_VERSION_AT_LEAST(3,1)
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#    define av_noinline __attribute__((noinline))
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#else
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#    define av_noinline
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#endif
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#endif
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#ifndef av_pure
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#if AV_GCC_VERSION_AT_LEAST(3,1)
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#    define av_pure __attribute__((pure))
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#else
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#    define av_pure
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#endif
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#endif
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#ifndef av_const
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#if AV_GCC_VERSION_AT_LEAST(2,6)
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#    define av_const __attribute__((const))
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#else
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#    define av_const
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#endif
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#endif
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#ifndef av_cold
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#if (!defined(__INTEL_COMPILER) || __INTEL_COMPILER > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
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#    define av_cold __attribute__((cold))
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#else
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#    define av_cold
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#endif
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#endif
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#ifndef av_flatten
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#if (!defined(__INTEL_COMPILER) || __INTEL_COMPILER > 1110) && AV_GCC_VERSION_AT_LEAST(4,1)
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#    define av_flatten __attribute__((flatten))
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#else
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#    define av_flatten
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#endif
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#endif
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#ifndef attribute_deprecated
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#if AV_GCC_VERSION_AT_LEAST(3,1)
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#    define attribute_deprecated __attribute__((deprecated))
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#else
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#    define attribute_deprecated
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#endif
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#endif
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#ifndef av_unused
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#if defined(__GNUC__)
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#    define av_unused __attribute__((unused))
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#else
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#    define av_unused
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#endif
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#endif
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/**
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 * Mark a variable as used and prevent the compiler from optimizing it
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 * away.  This is useful for variables accessed only from inline
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 * assembler without the compiler being aware.
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 */
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#ifndef av_used
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#if AV_GCC_VERSION_AT_LEAST(3,1)
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#    define av_used __attribute__((used))
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#else
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#    define av_used
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#endif
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#endif
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#ifndef av_alias
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#if (!defined(__INTEL_COMPILER) || __INTEL_COMPILER > 1200) && AV_GCC_VERSION_AT_LEAST(3,3)
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#   define av_alias __attribute__((may_alias))
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#else
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#   define av_alias
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#endif
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#endif
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#ifndef av_uninit
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#if defined(__GNUC__) && !defined(__INTEL_COMPILER)
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#    define av_uninit(x) x=x
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#else
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#    define av_uninit(x) x
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#endif
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#endif
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#ifdef __GNUC__
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#    define av_builtin_constant_p __builtin_constant_p
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#else
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#    define av_builtin_constant_p(x) 0
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#endif
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#endif /* AVUTIL_ATTRIBUTES_H */