https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119590
Alisdair Meredith <alisdairm at me dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |alisdairm at me dot com --- Comment #7 from Alisdair Meredith <alisdairm at me dot com> --- For a short term workaround adding `-D_Alignof=alignof` to your command lines should work -- at least according to my quick testing. If gcc were to add `_Alignof` support in C++, we might still need that -D hack in order to build the initial compiler --- but that assumes we do not wait for Apple to update their SDK, if they believe that this is an issue they are concerned about.