use std::path::PathBuf;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("cargo:rerun-if-changed=build.rs");
    if std::env::var("HOST")? != std::env::var("TARGET")? {
        return Err("Snapshot generation requires a native build (HOST must equal TARGET)".into());
    }
    let snapshot = avril_runtime::assembly::create_snapshot()?;
    let output = PathBuf::from(std::env::var_os("OUT_DIR").ok_or("Missing OUT_DIR")?);
    std::fs::write(output.join("runtime.snapshot"), snapshot.as_bytes())?;
    Ok(())
}