https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111122
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Sure, struct T { const char *d = init (); constexpr int size () const { return 2; } constexpr const char *data () const { return d; } constexpr const char *init () const { return new char[2] { 'o', 'k' }; } constexpr ~T () { delete[] d; } }; constexpr int a = T{}.size (); constexpr int b = T{}.data ()[0]; works.