https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80437
--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> --- Maybe all four (decimal, hex, formula, and constant): bug.c:11:5: warning: 'memset': specified size 18446744073709551611 (aka 0xfffffffffffffffb, 1<<64 - 5, SOME_CONST) exceeds maximum object size 9223372036854775807 (aka 0x7fffffffffffffff, 1<<63 - 1, SOME_OTHER_CONST)