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//! Determine rustc version `proc-macro-srv` (and thus the sysroot ABI) is
//! build with and make it accessible at runtime for ABI selection.
use std::{env, fs::File, io::Write, path::PathBuf, process::Command};
fn main() {
let mut path = PathBuf::from(env::var_os("OUT_DIR").unwrap());
path.push("rustc_version.rs");
let mut f = File::create(&path).unwrap();
let rustc = env::var("RUSTC").expect("proc-macro-srv's build script expects RUSTC to be set");
let output = Command::new(rustc).arg("--version").output().expect("rustc --version must run");
let version_string = std::str::from_utf8(&output.stdout[..])
.expect("rustc --version output must be UTF-8")
.trim();
write!(
f,
"
#[allow(dead_code)]
pub(crate) const RUSTC_VERSION_STRING: &str = {version_string:?};
"
)
.unwrap();
}
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