package/ffmpeg: Fix i586 compilation with gcc5

In file included from libavcodec/cabac_functions.h:46:0,

                 from libavcodec/h264_cabac.c:37:
libavcodec/h264_cabac.c: In function 'ff_h264_decode_mb_cabac':
libavcodec/x86/cabac.h:192:5: error: 'asm' operand has impossible constraints
     __asm__ volatile(

To reproduce the bug use this defconfig:

BR2_GCC_VERSION_5_1_X=y
BR2_PACKAGE_FFMPEG=y
BR2_PACKAGE_FFMPEG_GPL=y
BR2_PACKAGE_FFMPEG_NONFREE=y
BR2_PACKAGE_FFMPEG_FFPLAY=y
BR2_PACKAGE_FFMPEG_FFSERVER=y
BR2_PACKAGE_FFMPEG_FFPROBE=y
BR2_PACKAGE_FFMPEG_AVRESAMPLE=y
BR2_PACKAGE_FFMPEG_POSTPROC=y

---
v2: bug only occurs with a i586 target cpu

 package/ffmpeg/ffmpeg.mk |    3 +++
 1 file changed, 3 insertions(+)

index 787dbb1..83c3cfb 100644
@@ -261,6 +261,9 @@ ifeq ($(BR2_X86_CPU_HAS_MMX),y)
 FFMPEG_CONF_OPTS += --enable-yasm
 FFMPEG_DEPENDENCIES += host-yasm
 else
+ifeq ($(BR2_x86_i586),y)
+FFMPEG_CONF_OPTS += --disable-inline-asm
+endif
 FFMPEG_CONF_OPTS += --disable-yasm
 FFMPEG_CONF_OPTS += --disable-mmx
 endif

1.7.10.4

Dear Bernd Kuhls,

Applied, thanks. Did you submit a bug report to ffmpeg upstream?

Thanks,

Thomas

Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com