https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16351
--- Comment #51 from Tim Ruehsen <tim.ruehsen at gmx dot de> --- (In reply to Martin Sebor from comment #50) > Yes, -Wnull-dereference is only in GCC 6 and later. -Wnonnull is in 5 and > prior but it does only a superficial job of checking (it only detects null > pointer constants). in GCC 7, -Wnonnull does a better job (but it's still > far from perfect). This option is not for C ? gcc 6.3.0 with options '-Q --help=warnings,C' doesn't print it out. But '-Q --help=warnings' does. Correct or missing (and if missing what else is missing with C !?).
