Comment by qb45

I don't know if it's guaranteed to bark on all possible cases of UB, but there we go:

  $ cat test.c
  int main() {
          return *(int*)0;
  }
  $ gcc test.c -fsanitize=undefined -o test
  $ ./test
  test.c:2:9: runtime error: load of null pointer of type 'int'
  Segmentation fault

I'm pretty sure I've seen similar tool based on clang as well.

And there is valgrind.