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

Consider the following code

unint.cpp:

int main()
{
    int a;
    int b;
    a++;
    b = b + 5;

    return 0;
}

If the code is compiled with following comment, the warning messages shall be displayed.

g++ -O3 -Wuninitialized unint.cpp

Note: the -Wuninitialized needs the -O3 option also.