https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63803
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> --- (In reply to Airbak from comment #3) > 2. > *((unsigned int *)0) is OK > *((volatile unsigned int *)0) is not OK. > Why the "volatile" makes different? Because volatile prevents the compiler from optimizing that statement out. As stated above, dereferencing a NULL pointer is undefined, so if you do that, all bets are off. You can use -fno-isolate-erroneous-paths-dereference, but I think the problem is elsewhere.
