use std::{env::var_os, fs::{create_dir, File}, os::unix::process::CommandExt, process::Command};

fn main() {
    Err(
        Command::new(var_os("rustc").unwrap())
        .arg("--print=cfg")
        .stdout(File::create(var_os("out").unwrap()).unwrap())
        .exec())
    .unwrap()
}