https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58142
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- Thanks (and thanks Ev. Drikos for the update). I'm tempted to close this either FIXED or WONTFIX then. I don't think fixing it is really possible for older versions of Darwin so not much point keeping the bug open to pretend we're going to do anything about it.
