https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87276
--- Comment #6 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> --- Note concerning the tests: in Debian, as of gcc-snapshot 1:20181209-1, MPFR is no longer affected (and I've checked that the failure is still reproducible with gcc-snapshot 1:20181127-1). But the testcase in Comment 1 still fails.
