build.rs

use std::env;
use std::path::PathBuf;

fn main() {
    // Generate C header bindings.
    println!("cargo:rerun-if-changed=bindings.h");

    let bindings = bindgen::Builder::default()
        .header("bindings.h")
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        .generate()
        .expect("Unable to generate C bindings");

    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Unable to write bindings.rs");

    // Compile C code.
    cc::Build::new()
        .file("c/swap.c")
        .flag("-std=c17")
        .compile("swap");
}