https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69881
--- Comment #11 from Bernd Edlinger <bernd.edlinger at hotmail dot de> --- (In reply to Jakub Jelinek from comment #10) > Why should libstdc++ try to workaround a bug in gmp.h? Just fix gmp.h... Yes, and probably it is already fixed with gmp-6.1.0, I did not check. I am trying to bootstrap gcc-4.9 plus the cfns.h patch from yesterday together with a fixed gmp-4.3.2 which is just what download_prerequisites installed. IMHO libstdc++ is just fragile if it lets those __need_-thingies pass through and then assumes that max_align_t must be defined. And the free-standing cstdlib is simply not defining offsetof when it apparently tries to.
