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.

module unrolled;

extern(C) int printf(char*, ...);

void test(T...)(T t) {
    foreach (value; t) {
        printf("%d\n", value);
        if (value == 2)
            break;
    }
}

void main() {
    test(1,4,3);
}