https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16351
--- Comment #54 from Martin Sebor <msebor at gcc dot gnu.org> --- (In reply to janus from comment #53) Unfortunately, it isn't. The warning depends on actually dereferencing the null pointer (i.e., trying to access the object it points to) and passing the argument in the call to f(*((int*) NULL)) doesn't do that. The pointer is derefernced later, in f, but the -Wnull-dereference checker doesn't see it because the call to f() isn't inlined by the time it runs (or ever). To issue the warning in this case the check also needs to happen when binding to references.
