A classic case for static analyzers. Clang with -Wall gives you: int.c:3:12: warning: indirection of non-volatile null pointer will be deleted, not t

A classic case for static analyzers. Clang with -Wall gives you: int.c:3:12: warning: indirection of non-volatile null pointer will be deleted, not trap [-Wnull-dereference] Much better, scan-build: int.c:3:12: warning: Dereference of null pointer return *(int*)0;