https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88737
--- Comment #3 from rguenther at suse dot de <rguenther at suse dot de> --- On Mon, 7 Jan 2019, jakub at gcc dot gnu.org wrote: > 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. Indeed. So it would be *a = {CLOBBER}; which is of course somewhat difficult since we do not know the size of the object pointed to.
