https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94175
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- But for #c1 it is just a missed-optimization, while if the passing of a constexpr var to a function isn't an ODR use, isn't it then a standard violation that we aren't optimizing the variable read into its value?