A :: proc() {
} @build_if(LC_OS == OS_LINUX)

A :: proc() {
} @build_if(LC_OS == OS_WINDOWS)

A :: proc() {
} @build_if(LC_OS == OS_MAC)


B :: proc() {
} @build_if(0)

B :: proc() {
}

main :: proc(): int {
    A();
    B();
    return 0;
}