What am I missing?

See http://stackoverflow.com/questions/21755206/how-to-get-around-gcc-void-b-4-may-be-used-uninitialized-in-this-funct, answer says, the maybe is really a keep this feature off too many false positives

Also shows how to turn it off either  -Wno-maybe-uninitialized after -Wall or  -Wno-error=maybe-uninitialized