possible miscompilation on macOS Catalina 10.15.6

[Trevor Spiteri]

I maintain Rust language bindings to GMP and got a bug report from a
user on macOS Catalina 10.15.6.  I do not know if this issue is caused
by the particular system setup of the user or if it is more general, so
I'm listing what information I have in case it is actually reproducible
in a more general setting.

The bindings compilation process compiles GMP using:

ln -s path/to/extracted/gmp-6.2.0 gmp-src
mkdir gmp-build
cd gmp-build
../gmp-src/configure --enable-fat --disable-shared --with-pic
make -j 8
make -j 8 check

The make check is failing and outputting this on standard error:

../../../gmp-src/test-driver: line 107: 4825 Segmentation fault: 11 "$@"
> $log_file 2>&1
make[5]: *** [test-suite.log] Error 1
make[4]: *** [check-TESTS] Error 2
make[3]: *** [check-am] Error 2
make[2]: *** [check-recursive] Error 1
make[1]: *** [check-recursive] Error 1
make: *** [check] Error 2

I don't have standard output, so I don't know which test actually failed.

This is all the information I got; sorry if it is incomplete. (The
user's issue was solved by using their already installed homebrew?
libraries instead of compiling GMP anew.)