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136 lines
3.1 KiB
136 lines
3.1 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 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 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 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(__ICC) |
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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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# define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos))) |
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#else |
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# define av_builtin_constant_p(x) 0 |
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# define av_printf_format(fmtpos, attrpos) |
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#endif |
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#endif /* AVUTIL_ATTRIBUTES_H */
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