[Bug lto/93384] [10 Regression] Python 3.9.0a3 fails to build on ppc64le with GCC 10.0.1: redefined symbol cannot be used on reloc

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93384

--- Comment #15 from Peter Bergner <bergner at gcc dot gnu.org> ---
So using the configure setup (minus the -specs=... options) in Comment 13, I
was able to recreate the issue using unpatched Python-3.9.0a3 and GCC10.  The
failing command is:

/home/bergner/gcc/install/gcc-fsf-mainline-base/libexec/gcc/powerpc64le-linux/10.0.1/lto1
-quiet -dumpdir ./ -dumpbase libpython3.9.a -mcpu=power8 -mtune=power8 -m64
-auxbase-strip libpython3.9.so.lto.o -g -O2 -version -fno-openmp -fno-openacc
-fPIC -fuse-linker-plugin -ffat-lto-objects -flto-partition=none
-fno-semantic-interposition  -flinker-output=dyn @/tmp/ccikqTcI -o
getbuildinfo.s

I notice if I drop the -fno-semantic-interposition option, I only get 1:

  .set    _PyObject_AssertFailed.localalias,_PyObject_AssertFailed

instead of 2.