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arm: Suppress tags about used cpu arch and extensions 

When all the codepaths using manually set .arch/.fpu code is
behind runtime detection, the elf attributes should be suppressed.

This allows tools to know that the final built binary doesn't
strictly require these extensions.

Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit dcae2e32f7
and b77e335e44)
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit 9841654c15)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Martin Storsjö 2015-03-05 23:38:00 +02:00 committed by Michael Niedermayer
parent 0b25a4d253
commit 436f530a51
2 changed files with 12 additions and 0 deletions
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6
configure vendored
View File

@ -1466,6 +1466,7 @@ HAVE_LIST="
alsa_asoundlib_h
altivec_h
arpa_inet_h
as_object_arch
asm_mod_q
asm_mod_y
asm_types_h
@ -3964,6 +3965,11 @@ EOF
[ $target_os != win32 ] && enabled_all armv6t2 shared !pic && enable_weak_pic
# llvm's integrated assembler supports .object_arch from llvm 3.5
[ "$objformat" = elf ] && check_as <<EOF && enable as_object_arch
.object_arch armv4
EOF
elif enabled mips; then
check_inline_asm loongson '"dmult.g $1, $2, $3"'

6
libavutil/arm/asm.S
View File

@ -43,11 +43,17 @@
#elif HAVE_ARMV5TE
.arch armv5te
#endif
#if HAVE_AS_OBJECT_ARCH
ELF .object_arch armv4
#endif
#if HAVE_NEON
.fpu neon
ELF .eabi_attribute 10, 0 @ suppress Tag_FP_arch
ELF .eabi_attribute 12, 0 @ suppress Tag_Advanced_SIMD_arch
#elif HAVE_VFP
.fpu vfp
ELF .eabi_attribute 10, 0 @ suppress Tag_FP_arch
#endif
.syntax unified