Easy way find uninitialized member variables

Question

I am looking for an easy way to find uninitialized class member variables.

Finding them in either runtime or compile time is OK.

Currently

Answer 1

-Wuninitialized ?

(This only checks if a variable is used uninitialized, i.e. if

struct Q { 
  int x, y;
  Q() : x(2) {}
  int get_xy() const { return x*y; }
};

g++ will warn only when the user calls get_xy() without assigning to y.)