c++ - Difference of uninitialized values for g++ and g++14

If I compile and run a simple program in c++ like this:

int main(){

    int x;
    cout << x << endl;
}

and I compile in Linux saying g++ myProgram.cc (or g++ -std=c++14), I obviously get the ./a.out executable which works fine and the automatically initialized value 0 prints.

But if I compile my code with g++14 myProgram.cc, I get an error saying that x is uninitialized.

Is g++14 some sort of different version? I'm confused on why this is happening, thanks!