Disable 'attribute "foo" ignored' warnings from icc
[libav.git] / libavutil / attributes.h
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1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
2912e87a 4 * This file is part of Libav.
2791730d 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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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.
10 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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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.
15 *
16 * You should have received a copy of the GNU Lesser General Public
2912e87a 17 * License along with Libav; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
ba87f080 22 * @file
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23 * Macro definitions for various function/variable attributes
24 */
25
26#ifndef AVUTIL_ATTRIBUTES_H
27#define AVUTIL_ATTRIBUTES_H
28
29#ifdef __GNUC__
30# define AV_GCC_VERSION_AT_LEAST(x,y) (__GNUC__ > x || __GNUC__ == x && __GNUC_MINOR__ >= y)
31#else
32# define AV_GCC_VERSION_AT_LEAST(x,y) 0
33#endif
34
35#ifndef av_always_inline
36#if AV_GCC_VERSION_AT_LEAST(3,1)
37# define av_always_inline __attribute__((always_inline)) inline
38#else
39# define av_always_inline inline
40#endif
41#endif
42
43#ifndef av_noinline
44#if AV_GCC_VERSION_AT_LEAST(3,1)
45# define av_noinline __attribute__((noinline))
46#else
47# define av_noinline
48#endif
49#endif
50
51#ifndef av_pure
52#if AV_GCC_VERSION_AT_LEAST(3,1)
53# define av_pure __attribute__((pure))
54#else
55# define av_pure
56#endif
57#endif
58
59#ifndef av_const
60#if AV_GCC_VERSION_AT_LEAST(2,6)
61# define av_const __attribute__((const))
62#else
63# define av_const
64#endif
65#endif
66
67#ifndef av_cold
68#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
69# define av_cold __attribute__((cold))
70#else
71# define av_cold
72#endif
73#endif
74
75#ifndef av_flatten
76#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,1)
77# define av_flatten __attribute__((flatten))
78#else
79# define av_flatten
80#endif
81#endif
82
83#ifndef attribute_deprecated
84#if AV_GCC_VERSION_AT_LEAST(3,1)
85# define attribute_deprecated __attribute__((deprecated))
86#else
87# define attribute_deprecated
88#endif
89#endif
90
91#ifndef av_unused
92#if defined(__GNUC__)
93# define av_unused __attribute__((unused))
94#else
95# define av_unused
96#endif
97#endif
98
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99/**
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.
103 */
104#ifndef av_used
105#if AV_GCC_VERSION_AT_LEAST(3,1)
106# define av_used __attribute__((used))
107#else
108# define av_used
109#endif
110#endif
111
a74d707c 112#ifndef av_alias
086e997e 113#if (!defined(__ICC) || __ICC > 1200) && AV_GCC_VERSION_AT_LEAST(3,3)
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114# define av_alias __attribute__((may_alias))
115#else
116# define av_alias
117#endif
118#endif
119
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120#ifndef av_uninit
121#if defined(__GNUC__) && !defined(__ICC)
122# define av_uninit(x) x=x
123#else
124# define av_uninit(x) x
125#endif
126#endif
127
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128#ifdef __GNUC__
129# define av_builtin_constant_p __builtin_constant_p
130#else
131# define av_builtin_constant_p(x) 0
132#endif
133
2791730d 134#endif /* AVUTIL_ATTRIBUTES_H */