On many(all?) Debian derivatives, when building the upstream glibc,
`make check` has 100+ failures due to `libgcc_s.so.1 must be installed for pthread_cancel to work`

I filed https://sourceware.org/bugzilla/show_bug.cgi?id=28177 .
An upstream maintainer told me that:

So hope a Debian developer can upstream the path so that
a glibc contributor doesn't need to
`cp /usr/lib/x86_64-linux-gnu/libgcc_s.so.1 $prefix/bfd/lib/`
to make `make check` happy.