https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79190
--- Comment #3 from John David Anglin <danglin at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #1) > Looks like we do need to create a fall-back implementation after all, as > Marc suggested in https://gcc.gnu.org/ml/gcc-patches/2016-09/msg00422.html A working backup would be even better if possible.