Factor out the code to find gcc, and add a command-line option to override the default executable name. This should help cross-compilation by allowing a cross-gcc to be specified from the configuration file instead of only through the CC environment variable.

struct V(T...) {
    T v;
}

alias V!(float, int) MyV;

void main()
{
    assert(MyV.sizeof == float.sizeof + int.sizeof);
    auto f = 3.75f;
    auto v = MyV(f, 3);
    assert(v.v[0] == 3.75f);
    assert(v.v[1] == 3);
}