fn main() {
    // println!("cargo:rustc-link-arg-bins=--nmagic");
    println!("cargo:rustc-link-arg-bins=-Tlink.x");
    // println!("cargo:rustc-link-arg-bins=-Tdefmt.x");

    let out_dir = std::env::var("OUT_DIR").unwrap();
    let out_dir = std::path::PathBuf::from(out_dir);
    std::fs::write(out_dir.join("memory.x"), include_bytes!("memory.x")).unwrap();
    println!("cargo:rustc-link-search={}", out_dir.display());
    println!("cargo:rerun-if-changed=memory.x");

    // Embed firmware build timestamp as minutes since Unix epoch (4 bytes, big-endian).
    // Dropping sub-minute precision keeps it in 4 bytes for many years.
    let build_seconds = std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .expect("System time before UNIX_EPOCH")
        .as_secs();
    let build_minutes = (build_seconds / 60) as u32;
    let bytes = build_minutes.to_be_bytes();
    std::fs::write(out_dir.join("build_minutes.bin"), bytes).unwrap();
    println!("cargo:rerun-if-changed=build.rs");
}