Linking error in MIPS when using LTO since ffmpeg 4.4.0

[RedDwarf]

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