//! Bakes the compiling toolchain's version into `AURA_RUSTC_VERSION` so the
//! project descriptor (src/project.rs) can stamp it. Runs per consuming build:
//! the host binary and a project cdylib each recompile aura-core under their
//! own toolchain, which is exactly what makes the two stamps comparable.

fn main() {
    let rustc = std::env::var("RUSTC").unwrap_or_else(|_| "rustc".into());
    let out = std::process::Command::new(&rustc)
        .arg("--version")
        .output()
        .expect("rustc --version");
    println!(
        "cargo:rustc-env=AURA_RUSTC_VERSION={}",
        String::from_utf8_lossy(&out.stdout).trim()
    );
}