build.rs

fn main() {
    #[cfg(any(target_os = "freebsd", target_os = "openbsd", target_os = "netbsd"))]
    compile_native_lib();
}

#[cfg(any(target_os = "freebsd", target_os = "openbsd", target_os = "netbsd"))]
fn compile_native_lib() {
    let src_dir = std::path::PathBuf::from("src/platform/bsd/native");

    let mut c_files = Vec::new();
    find_c_files(&src_dir, &mut c_files);

    if c_files.is_empty() {
        println!("cargo:warning=no C files found in {}", src_dir.display());
        return;
    }

    let mut build = cc::Build::new();

    for file in &c_files {
        build.file(file);
    }

    build.include(&src_dir);
    build.compile("bsd_native_lib");

    for file in &c_files {
        println!("cargo:rerun-if-changed={}", file.display());
    }

    println!("cargo:rerun-if-changed={}", src_dir.display());
}

#[cfg(any(target_os = "freebsd", target_os = "openbsd", target_os = "netbsd"))]
fn find_c_files(dir: &std::path::Path, out: &mut Vec<std::path::PathBuf>) {
    if !dir.is_dir() {
        return;
    }

    let Ok(entries) = std::fs::read_dir(dir) else {
        return;
    };

    for entry in entries {
        let Ok(entry) = entry else { continue };
        let path = entry.path();
        if path.is_dir() {
            find_c_files(&path, out);
        } else if let Some(ext) = path.extension()
            && ext == "c"
        {
            out.push(path);
        }
    }
}