[PATCH][PR sanitizer/77631] Support separate debug info in libbacktrace

[Martin Liška]

Hi.

Currently I see with --with-build-config=bootstrap-ubsan:

/home/marxin/BIG/buildbot/slave/gcc-master-bootstrap-ubsan/build/builddir/prev-x86_64-pc-linux-gnu/libsanitizer/ubsan/.libs/libubsan.a(elf.o): In function `backtrace_uncompress_zdebug':
/home/marxin/BIG/buildbot/slave/gcc-master-bootstrap-ubsan/build/builddir/x86_64-pc-linux-gnu/libsanitizer/libbacktrace/../../.././../libsanitizer/libbacktrace/../../libbacktrace/elf.c:2489: multiple definition of `backtrace_uncompress_zdebug'
../libbacktrace/.libs/libbacktrace.a(elf.o):/home/marxin/BIG/buildbot/slave/gcc-master-bootstrap-ubsan/build/builddir/libbacktrace/.././../libbacktrace/elf.c:2489: first defined here
collect2: error: ld returned 1 exit status
make[3]: *** [Makefile:2904: gcov] Error 1
make[3]: *** Waiting for unfinished jobs....

Thanks,
Martin