+extern crate autocfg;
+
use std::env;
-use std::io::Write;
-use std::process::{Command, Stdio};
fn main() {
- if probe("fn main() { 0i128; }") {
+ let ac = autocfg::new();
+ if ac.probe_type("i128") {
println!("cargo:rustc-cfg=has_i128");
} else if env::var_os("CARGO_FEATURE_I128").is_some() {
panic!("i128 support was not detected!");
}
-}
-
-/// Test if a code snippet can be compiled
-fn probe(code: &str) -> bool {
- let rustc = env::var_os("RUSTC").unwrap_or_else(|| "rustc".into());
- let out_dir = env::var_os("OUT_DIR").expect("environment variable OUT_DIR");
-
- let mut child = Command::new(rustc)
- .arg("--out-dir")
- .arg(out_dir)
- .arg("--emit=obj")
- .arg("-")
- .stdin(Stdio::piped())
- .spawn()
- .expect("rustc probe");
-
- child
- .stdin
- .as_mut()
- .expect("rustc stdin")
- .write_all(code.as_bytes())
- .expect("write rustc stdin");
- child.wait().expect("rustc probe").success()
+ autocfg::rerun_path(file!());
}