//! Build script — compiles the C shim that exposes Lean's inline
//! runtime helpers as real extern symbols (see shim.c).
//!
//! Mirrors `native/cubical/build.rs`.  Native targets only.

fn main() {
    let target = std::env::var("TARGET").unwrap_or_default();
    if target.starts_with("wasm32") {
        return;
    }

    let lean_include = std::env::var("LEAN_INCLUDE").unwrap_or_else(|_| {
        let prefix = std::process::Command::new("lean")
            .arg("--print-prefix")
            .output()
            .expect("failed to run `lean --print-prefix`; set LEAN_INCLUDE instead");
        let prefix = String::from_utf8(prefix.stdout).unwrap();
        format!("{}/include", prefix.trim())
    });

    cc::Build::new()
        .file("shim.c")
        .include(&lean_include)
        .flag("-Wno-unused-parameter")
        .compile("topolei_render_shim");

    println!("cargo:rerun-if-changed=shim.c");
    println!("cargo:rerun-if-env-changed=LEAN_INCLUDE");
}