[FFmpeg-trac] #9534(undetermined:new): Linking error in MIPS when using LTO since ffmpeg 4.4.0

[FFmpeg]

#9534: Linking error in MIPS when using LTO since ffmpeg 4.4.0
-------------------------------------+-------------------------------------
             Reporter:  RedDwarf     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Building ffmpeg 4.4.0+ (tested with 4.4.1 too) results in the following
 linking error
 {{{
 LD      libavutil/libavutil.so.56
 /tmp/cc34UJEw.s: Assembler messages:
 /tmp/cc34UJEw.s:112: Error: Macro `parse_r' was already defined
 lto-wrapper: fatal error: /staging_dir/toolchain-
 mips_74kc_gcc-7.5.0_musl/bin/mips-openwrt-linux-musl-gcc returned 1 exit
 status
 compilation terminated.
 /staging_dir/toolchain-mips_74kc_gcc-7.5.0_musl/lib/gcc/mips-openwrt-
 linux-musl/7.5.0/../../../../mips-openwrt-linux-musl/bin/ld: error: lto-
 wrapper failed
 collect2: error: ld returned 1 exit status
 make[3]: *** [/lala/build/src/ffmpeg/external-ffmpeg-prefix/src/external-
 ffmpeg/ffbuild/library.mak:103: libavutil/libavutil.so.56] Error 1
 make[3]: Leaving directory '/lala/build/src/ffmpeg/external-ffmpeg-
 prefix/src/external-ffmpeg-build'
 gmake[2]: *** [src/ffmpeg/CMakeFiles/external-ffmpeg.dir/build.make:86:
 src/ffmpeg/external-ffmpeg-prefix/src/external-ffmpeg-stamp/external-
 ffmpeg-build] Error 2
 gmake[1]: *** [CMakeFiles/Makefile2:213: src/ffmpeg/CMakeFiles/external-
 ffmpeg.dir/all] Error 2
 gmake: *** [Makefile:136: all] Error 2
 }}}
 when building with --enable-lto.

 The problem has been observed in two different MIPS toolchains. One of
 them being
 https://github.com/openwrt/openwrt/commit/1df49d98e7ed8e8e889d571973fac062694531af.

 This is the configuration
 {{{
 bash-5.1# ./configure --cc=/staging_dir/toolchain-
 mips_74kc_gcc-7.5.0_musl/bin/mips-openwrt-linux-musl-gcc --enable-cross-
 compile --arch=mips --target-os=linux --disable-all --enable-avutil
 --disable-static --enable-shared --enable-lto
 install prefix            /usr/local
 source path               .
 C compiler                /staging_dir/toolchain-
 mips_74kc_gcc-7.5.0_musl/bin/mips-openwrt-linux-musl-gcc
 C library
 host C compiler           gcc
 host C library            glibc
 ARCH                      mips (generic)
 big-endian                yes
 runtime cpu detection     yes
 MIPS FPU enabled          no
 MIPS DSP R1 enabled       no
 MIPS DSP R2 enabled       no
 MIPS MSA enabled          no
 MIPS MSA2 enabled         no
 LOONGSON MMI enabled      no
 debug symbols             yes
 strip symbols             yes
 optimize for size         no
 optimizations             yes
 static                    no
 shared                    yes
 postprocessing support    no
 network support           no
 threading support         pthreads
 safe bitstream reader     yes
 texi2html enabled         no
 perl enabled              yes
 pod2man enabled           yes
 makeinfo enabled          no
 makeinfo supports HTML    no

 External libraries:
 bzlib                   iconv                   zlib

 External libraries providing hardware acceleration:
 cuda_llvm               v4l2_m2m

 Libraries:
 avutil

 Programs:

 Enabled decoders:

 Enabled encoders:

 Enabled hwaccels:

 Enabled parsers:

 Enabled demuxers:

 Enabled muxers:

 Enabled protocols:

 Enabled filters:

 Enabled bsfs:

 Enabled indevs:

 Enabled outdevs:

 License: LGPL version 2.1 or later

 WARNING: generic cpu selected
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9534>
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