2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Macro definitions for various function/variable attributes
26 #ifndef AVUTIL_ATTRIBUTES_H
27 #define AVUTIL_ATTRIBUTES_H
30 # define AV_GCC_VERSION_AT_LEAST(x,y) (__GNUC__ > x || __GNUC__ == x && __GNUC_MINOR__ >= y)
32 # define AV_GCC_VERSION_AT_LEAST(x,y) 0
35 #ifndef av_always_inline
36 #if AV_GCC_VERSION_AT_LEAST(3,1)
37 # define av_always_inline __attribute__((always_inline)) inline
39 # define av_always_inline inline
44 #if AV_GCC_VERSION_AT_LEAST(3,1)
45 # define av_noinline __attribute__((noinline))
52 #if AV_GCC_VERSION_AT_LEAST(3,1)
53 # define av_pure __attribute__((pure))
60 #if AV_GCC_VERSION_AT_LEAST(2,6)
61 # define av_const __attribute__((const))
68 #if AV_GCC_VERSION_AT_LEAST(4,3)
69 # define av_cold __attribute__((cold))
76 #if AV_GCC_VERSION_AT_LEAST(4,1)
77 # define av_flatten __attribute__((flatten))
83 #ifndef attribute_deprecated
84 #if AV_GCC_VERSION_AT_LEAST(3,1)
85 # define attribute_deprecated __attribute__((deprecated))
87 # define attribute_deprecated
93 # define av_unused __attribute__((unused))
100 * Mark a variable as used and prevent the compiler from optimizing it
101 * away. This is useful for variables accessed only from inline
102 * assembler without the compiler being aware.
105 #if AV_GCC_VERSION_AT_LEAST(3,1)
106 # define av_used __attribute__((used))
113 #if AV_GCC_VERSION_AT_LEAST(3,3)
114 # define av_alias __attribute__((may_alias))
121 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
122 # define av_uninit(x) x=x
124 # define av_uninit(x) x
129 # define av_builtin_constant_p __builtin_constant_p
131 # define av_builtin_constant_p(x) 0
134 #endif /* AVUTIL_ATTRIBUTES_H */