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ffmpeg: make ARM optimizations explicit

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The ffmpeg configure script tries to autodetermine ARM optimizations by
building a small code snippet with AS.
If AS allows higher-level (>generic) assembly instructions then it
passes and enables the relevant optimization path.
Some toolchains allow/default to more than generic asm and then fail
when the real code is built.
Fixes:
http://autobuild.buildroot.net/results/b6e1225a07a58cc7544e37bc55675be71e2b5088/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Gustavo Zacarias 2012-12-21 02:40:31 +00:00 committed by Peter Korsgaard
parent 2534754102
commit 9e77eafbd8
1 changed files with 9 additions and 2 deletions
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11
package/multimedia/ffmpeg/ffmpeg.mk
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@ -133,19 +133,26 @@ FFMPEG_DEPENDENCIES += host-nasm
endif
endif
# ARM defaults to v5: clear if less, add extra if more
# Explicitly disable everything that doesn't match for ARM
# FFMPEG "autodetects" by compiling an extended instruction via AS
# This works on compilers that aren't built for generic by default
ifeq ($(BR2_generic_arm)$(BR2_arm7tdmi)$(BR2_arm610)$(BR2_arm710)$(BR2_arm720t)$(BR2_arm920t)$(BR2_arm922t),y)
FFMPEG_CONF_OPT += --disable-armv5te
endif
ifeq ($(BR2_arm1136jf_s)$(BR2_arm1176jz_s)$(BR2_arm1176jzf-s),y)
FFMPEG_CONF_OPT += --enable-armv6
else
FFMPEG_CONF_OPT += --disable-armv6 --disable-armv6t2
endif
ifeq ($(BR2_arm10)$(BR2_arm1136jf_s)$(BR2_arm1176jz_s)$(BR2_arm1176jzf-s)$(BR2_cortex_a8)$(BR2_cortex_a9),y)
ifeq ($(BR2_arm10)$(BR2_arm1136jf_s)$(BR2_arm1176jz_s)$(BR2_arm1176jzf-s)$(BR2_cortex_a5)$(BR2_cortex_a8)$(BR2_cortex_a9)$(BR2_cortex_a15),y)
FFMPEG_CONF_OPT += --enable-armvfp
else
FFMPEG_CONF_OPT += --disable-armvfp
endif
ifeq ($(BR2_ARM_CPU_HAS_NEON),y)
FFMPEG_CONF_OPT += --enable-neon
endif
# Set powerpc altivec appropriately
ifeq ($(BR2_powerpc),y)
ifeq ($(BR2_powerpc_7400)$(BR2_powerpc_7450)$(BR2_powerpc_970),y)