How to warn when assigning or performing arithmetic with different enum types in GCC?

While I'm aware this is valid C not to differentiate between enum types.

GCC does have -Wenum-compare (which I'm using) and works as expected.

I tried using -Wconversion but this doesn't make any difference.

How can assignments and arithmetic operators (+/-/&/|... etc) also generate warnings? (assignment, or and... etc)

{
    enum Foo f = SOME_VALUE;
    enum Bar b = SOME_OTHER_VALUE;

    if (f != b) {
        /* this warns! */
    }

    f = b;  /* <-- how to warn about this? */
    f |= b;  /* .. and this? */

}

Notes:

• Switching to C++ is not an option (as suggested in other answers).
• This question is closely related, however its not a duplicate because it's about passing arguments instead of arithmetic.