https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69881
--- Comment #3 from Bernd Edlinger <bernd.edlinger at hotmail dot de> --- or #undef all these __need_XXX before including stddef.h, after all it is a bit bogus ghat gmp.h does: #define __need_size_t /* tell gcc stddef.h we only want size_t */ #include <cstddef> /* for size_t */ is cstddef supposed to honor __need_size_t at all?
