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Fix missing used attribute for inline assembly variables

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Variables used in inline assembly need to be marked with attribute((used)).
Static constants already were, via the define of DECLARE_ASM_CONST.
But DECLARE_ALIGNED does not add this attribute, and some of the variables
defined with it are const only used in inline assembly, and therefore
appeared dead. This change adds a macro DECLARE_ASM_ALIGNED that marks
variables as used.

This change makes FFMPEG work with Clang's ThinLTO.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Thomas Köppe
2017-11-12 16:24:37 +00:00
committed by Michael Niedermayer
parent 1828c549c3
commit 43171a2a73
4 changed files with 34 additions and 17 deletions
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libavcodec/cabac.c
+1 -1
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@@ -32,7 +32,7 @@
#include "cabac.h"
#include "cabac_functions.h"
const uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63] = {
DECLARE_ASM_ALIGNED(1, const uint8_t, ff_h264_cabac_tables)[512 + 4*2*64 + 4*64 + 63] = {
9,8,7,7,6,6,6,6,5,5,5,5,5,5,5,5,
4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,