Bug 678744

Summary:	media-video/ffmpeg-3.4.5 USE="chromium +v4l" - libavcodec/libavcodec.a(v4l2_buffers.o): In function `v4l2_free_buffer': v4l2_buffers.c:(.text+0xc64): undefined reference to `sem_post'
Product:	Gentoo Linux	Reporter:	ernsteiswuerfel <erhard_f>
Component:	Current packages	Assignee:	Gentoo Media-video project <media-video>
Status:	RESOLVED OBSOLETE
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	PPC64
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Attachments:	build.log.xz emerge --info

Description ernsteiswuerfel archtester

2019-02-25 11:43:17 UTC

Found this during package testing and worked out a minimal set of USE-flags. Building fails with USE="X chromium v4l". Builing succeeds with USE="X -chromium v4l".

[...]
powerpc64-unknown-linux-gnu-gcc -shared -Wl,-soname,libffmpeg.so -Wl,-Bsymbolic -Wl,-z,now -Wl,-z,relro -Wl,-z,defs -Wl,--gc-sections -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,-O1 -Wl,--as-needed -Wl,--hash-style=gnu   -Wl,--as-needed -Wl,-z,noexecstack -Wl,--warn-common -Wl,-rpath-link=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample  -o libffmpeg.so -Wl,--whole-archive libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswresample/libswresample.a -Wl,--no-whole-archive  -lXv -lX11 -lXext -ljack -lasound -lm -ldl 
libavcodec/libavcodec.a(v4l2_buffers.o): In function `v4l2_free_buffer':
v4l2_buffers.c:(.text+0xc64): undefined reference to `sem_post'
libavcodec/libavcodec.a(v4l2_m2m.o): In function `v4l2_prepare_contexts':
v4l2_m2m.c:(.text+0x58): undefined reference to `sem_init'
libavcodec/libavcodec.a(v4l2_m2m.o): In function `ff_v4l2_m2m_codec_reinit':
v4l2_m2m.c:(.text+0x230): undefined reference to `sem_wait'
v4l2_m2m.c:(.text+0x27c): undefined reference to `sem_destroy'
v4l2_m2m.c:(.text+0x290): undefined reference to `sem_init'
libavcodec/libavcodec.a(v4l2_m2m.o): In function `ff_v4l2_m2m_codec_end':
v4l2_m2m.c:(.text+0x3fc): undefined reference to `sem_destroy'
v4l2_m2m.c:(.text+0x500): undefined reference to `sem_destroy'
libavcodec/libavcodec.a(v4l2_m2m.o): In function `ff_v4l2_m2m_codec_full_reinit':
v4l2_m2m.c:(.text+0x62c): undefined reference to `sem_wait'
collect2: error: ld returned 1 exit status
make: *** [/var/tmp/portage/media-video/ffmpeg-3.4.5/work/ffmpeg-3.4.5/ffbuild/libffmpeg.mak:5: libffmpeg-] Error 1

Comment 1 ernsteiswuerfel archtester

2019-02-25 11:44:36 UTC

Created attachment 566406 [details]
build.log.xz

Comment 2 ernsteiswuerfel archtester

2019-02-25 11:45:09 UTC

Created attachment 566408 [details]
emerge --info

Comment 3 ernsteiswuerfel archtester

2020-05-15 12:08:44 UTC

media-video/ffmpeg-4.2.2 builds fine with USE="X chromium v4l".