https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117466
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |INVALID Status|UNCONFIRMED |RESOLVED CC| |jakub at gcc dot gnu.org --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Because the testcase invokes UB (dereferences a NULL pointer) - d = in[0]; in particular where in is nullptr and path isolation just adds __builtin_trap after it because everything after invoking the UB is not needed.