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| author | Mans Rullgard <mans@mansr.com> | 2011-01-31 02:19:30 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2011-01-31 18:25:48 +0100 |
| commit | 0374152f8926bb3d0f2cd9cca56d12521fe0f71b (patch) | |
| tree | d0d65e4222b34952f3a4f153b3535bd0528a9321 /libavutil/attributes.h | |
| parent | a735bbbb7a27fa89318d60b91558c3045b6b27c6 (diff) | |
| download | ffmpeg-0374152f8926bb3d0f2cd9cca56d12521fe0f71b.tar.gz | |
Rename attribute_used to av_used and move it to attributes.h
This is consistent with most of the other attribute macros.
Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit 365e3c7878e4e821d5dec922d2d51f92ce13f926)
Diffstat (limited to 'libavutil/attributes.h')
| -rw-r--r-- | libavutil/attributes.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/libavutil/attributes.h b/libavutil/attributes.h index d93f46093c..65a9249cd5 100644 --- a/libavutil/attributes.h +++ b/libavutil/attributes.h @@ -96,6 +96,19 @@ #endif #endif +/** + * Mark a variable as used and prevent the compiler from optimizing it + * away. This is useful for variables accessed only from inline + * assembler without the compiler being aware. + */ +#ifndef av_used +#if AV_GCC_VERSION_AT_LEAST(3,1) +# define av_used __attribute__((used)) +#else +# define av_used +#endif +#endif + #ifndef av_alias #if (!defined(__ICC) || __ICC > 1200) && AV_GCC_VERSION_AT_LEAST(3,3) # define av_alias __attribute__((may_alias)) |