How do I determine which functions are unimplemented?

[zhengxianwei]

When a function is commented out and the application calls it, the
application crash silently . I dont know which function caused this. Is
there any way to quickly determine which functions are unimplemented ?

eg:
https://github.com/wine-mirror/wine/blob/226a7eeabbc13345e49da1ff8c018d6f062...