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use env::consts::{EXE_EXTENSION, EXE_SUFFIX};
use std::env;
use std::ffi::OsString;
use std::path::PathBuf;
/// Given an executable called `name`, return the filename for the
/// executable for a particular target.
pub fn exe(name: &PathBuf) -> PathBuf {
if EXE_EXTENSION != "" && name.extension() != Some(EXE_EXTENSION.as_ref()) {
let mut name: OsString = name.clone().into();
name.push(EXE_SUFFIX);
name.into()
} else {
name.clone()
}
}
fn main() {
let host = env::var("HOST").unwrap();
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-env-changed=RUSTC");
println!("cargo:rustc-env=BUILD_TRIPLE={}", host);
// This may not be a canonicalized path.
let mut rustc = PathBuf::from(env::var_os("RUSTC").unwrap());
if rustc.is_relative() {
println!("cargo:rerun-if-env-changed=PATH");
for dir in env::split_paths(&env::var_os("PATH").unwrap_or_default()) {
let absolute = dir.join(&exe(&rustc));
if absolute.exists() {
rustc = absolute;
break;
}
}
}
assert!(rustc.is_absolute());
// FIXME: if the path is not utf-8, this is going to break. Unfortunately
// Cargo doesn't have a way for us to specify non-utf-8 paths easily, so
// we'll need to invent some encoding scheme if this becomes a problem.
println!("cargo:rustc-env=RUSTC={}", rustc.to_str().unwrap());
}
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