From 365e3c7878e4e821d5dec922d2d51f92ce13f926 Mon Sep 17 00:00:00 2001 From: Mans Rullgard Date: Mon, 31 Jan 2011 02:19:30 +0000 Subject: 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 --- libavutil/attributes.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'libavutil/attributes.h') 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)) -- cgit v1.2.3