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Allow specifying a specific std version (by commit hash) in an environment variable

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This commit is contained in:
Jethro Beekman 2016-10-11 17:48:48 -07:00
parent 359fdcb5e4
commit 3ad99dcdae
1 changed files with 10 additions and 4 deletions
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14
build.rs
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@ -36,10 +36,16 @@ impl Sub<Mapping> for Vec<Mapping> {
}
fn main() {
let mappings=include!("mapping.rs");
let compiler=rustc_version::version_meta().commit_hash.expect("Couldn't determine compiler version");
let io_commit=mappings.iter().find(|&&Mapping(elem,_)|elem==compiler).expect("Unknown compiler version, upgrade core_io?").1;
let io_commit=match env::var("CORE_IO_COMMIT") {
Ok(c) => c,
Err(env::VarError::NotUnicode(_)) => panic!("Invalid commit specified in CORE_IO_COMMIT"),
Err(env::VarError::NotPresent) => {
let mappings=include!("mapping.rs");
let compiler=rustc_version::version_meta().commit_hash.expect("Couldn't determine compiler version");
mappings.iter().find(|&&Mapping(elem,_)|elem==compiler).expect("Unknown compiler version, upgrade core_io?").1.to_owned()
}
};
let mut dest_path=PathBuf::from(env::var_os("OUT_DIR").unwrap());
dest_path.push("io.rs");