https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98076
--- Comment #11 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> --- Hi Rainer, Apologies for that, apparently I got confused between the keyword and the macro form. Can you confirm that bootstrapped is fixed if you change it to static_assert(sizeof(GFC_UINTEGER_LARGEST) <= 2 * sizeof(uint64_t), "integer too large"); ? If so, I will commit the patch to fix it immediately.