https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
--- Comment #76 from Jonathan Wakely <redi at gcc dot gnu.org> --- And our best guess is still that Apple's new filesystem has a bug. Does it work if you use this? make LN_S="cp -pR" If that works, we can change the makefiles to copy files on darwin, instead of using symlinks.
