https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88737
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Wouldn't that break e.g. programs that free (a); return (uintptr_t) a % 16; or similar (i.e. inspect the bits of the pointer rather than what it points to)? That should be valid even after free, free doesn't modify the pointer, only says that what it points to is no longer available.
