Bug 650460 – media-libs/avidemux-core-2.7.0 fails to build with -flto: relocation R_X86_64_PC32 against undefined symbol `bF8' can not be used when making a shared object; recompile with -fPIC

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Alexander Miller 2018-03-14 02:46:31 UTC]

Created attachment 523838 [details, diff]
avidemux-core-2.7.0-bundled-ffmpeg-lto-fix.patch

With LTO the build of media-libs/avidemux-core-2.7.0 fails when linking the libraries of the bundled ffmpeg. Here are the errors from the build log:

LD      libpostproc/libADM6postproc.so.54
LD      libavcodec/libADM6avcodec.so.57
LD      libswscale/libADM6swscale.so.4
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /tmp/portage/media-libs/avidemux-core-2.7.0/temp/ccgANYtl.ltrans1.ltrans.o: warning: relocation against `pb_03' in readonly section `.text'
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /tmp/portage/media-libs/avidemux-core-2.7.0/temp/ccgANYtl.ltrans6.ltrans.o: relocation R_X86_64_PC32 against undefined symbol `bF8' can not be used when making a shared object; recompile with -fPIC
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status
gmake[3]: *** [/tmp/portage/media-libs/avidemux-core-2.7.0/work/avidemux-core-2.7.0_build/ffmpeg/source/library.mak:94: libswscale/libADM6swscale.so.4] Error 1
gmake[3]: *** Waiting for unfinished jobs....
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /tmp/portage/media-libs/avidemux-core-2.7.0/temp/cca1w2es.ltrans29.ltrans.o: warning: relocation against `pd_1' in readonly section `.text'
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: /tmp/portage/media-libs/avidemux-core-2.7.0/temp/cca1w2es.ltrans7.ltrans.o: relocation R_X86_64_PC32 against undefined symbol `ff_h264_cabac_tables' can not be used when making a shared object; recompile with -fPIC
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status
gmake[3]: *** [/tmp/portage/media-libs/avidemux-core-2.7.0/work/avidemux-core-2.7.0_build/ffmpeg/source/library.mak:94: libavcodec/libADM6avcodec.so.57] Error 1
gmake[3]: Leaving directory '/tmp/portage/media-libs/avidemux-core-2.7.0/work/avidemux-core-2.7.0_build/ffmpeg/build'
make[2]: *** [CMakeFiles/libavutil_dummy.dir/build.make:61: CMakeFiles/libavutil_dummy] Error 2
make[2]: Leaving directory '/tmp/portage/media-libs/avidemux-core-2.7.0/work/avidemux-core-2.7.0_build'
make[1]: *** [CMakeFiles/Makefile2:71: CMakeFiles/libavutil_dummy.dir/all] Error 2
make[1]: Leaving directory '/tmp/portage/media-libs/avidemux-core-2.7.0/work/avidemux-core-2.7.0_build'
make: *** [Makefile:133: all] Error 2
 * ERROR: media-libs/avidemux-core-2.7.0::gentoo failed (compile phase):
 *   emake failed

These errors are due to using direct symbol references in inline asm (which are not visible to the compiler). Disabling those direct symbol refs in the bundled ffmpeg's configure fixes the build. The attached patch accomplishes this by creating a patch which is applied by avidemux-core's build system to the bundled ffmpeg sources.

[Comment 1 Kostadin Shishmanov 2023-07-05 12:00:10 UTC]

Can't reproduce this with media-libs/avidemux-core-2.8.1-r1 and gcc (Gentoo 13.1.1_p20230527 p3) 13.1.1 20230527

[Comment 2 Eli Schwartz 2024-02-28 22:05:06 UTC]

Can't reproduce with currently in-tree versions of avidemux-core either. I'm guessing the version change corresponds to upstream making this work.

https://github.com/mean00/avidemux2/commit/76f72e226684d68953de60c6d097f22c1c2f8ef1 may also be related.

[Comment 3 Eli Schwartz 2024-02-28 22:06:57 UTC]

Also possibly uplifted via a bundled ffmpeg update, e.g. https://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=a64df19c5bd22f543a254a7b93c82ade50038ff5