[FIXED] How portable is this C syntax?

Issue

I know GCC and probably Clang accept this syntax, but if I'm making games for the common 5 platforms (Mac, Windows, Linux, iOS, Android(Java)) but if I get C to run on Android probably by bridging Java and C, how portable is this? Should this be avoided?

I know that this is a bad funciton because simply return num*num; is enough but this syntax, should I avoid it?

int square(int num) {
    int x = ({
        int y = num;
        y*y;
    });
    return x;
}

Solution

This is not standard C. It's a GNU C extension called Statement Expressions. You should avoid it if you want maximum portability.

Answered By - Barmar

Answer Checked By - David Marino (PHPFixing Volunteer)