fn setup_clang()

in neqo-crypto/build.rs [62:91]

• 29 lines of code
• 6 McCabe index (conditional complexity)

fn setup_clang() {
    // If this isn't Windows, or we're in CI, then we don't need to do anything.
    if env::consts::OS != "windows" || env::var("GITHUB_WORKFLOW").unwrap_or_default() == "CI" {
        return;
    }
    println!("rerun-if-env-changed=LIBCLANG_PATH");
    println!("rerun-if-env-changed=MOZBUILD_STATE_PATH");
    if env::var("LIBCLANG_PATH").is_ok() {
        return;
    }
    let mozbuild_root = if let Ok(dir) = env::var("MOZBUILD_STATE_PATH") {
        PathBuf::from(dir.trim())
    } else {
        eprintln!("warning: Building without a gecko setup is not likely to work.");
        eprintln!("         A working libclang is needed to build neqo.");
        eprintln!("         Either LIBCLANG_PATH or MOZBUILD_STATE_PATH needs to be set.");
        eprintln!();
        eprintln!("    We recommend checking out https://github.com/mozilla/gecko-dev");
        eprintln!("    Then run `./mach bootstrap` which will retrieve clang.");
        eprintln!("    Make sure to export MOZBUILD_STATE_PATH when building.");
        return;
    };
    let libclang_dir = mozbuild_root.join("clang").join("lib");
    if libclang_dir.is_dir() {
        env::set_var("LIBCLANG_PATH", libclang_dir.to_str().unwrap());
        println!("rustc-env:LIBCLANG_PATH={}", libclang_dir.to_str().unwrap());
    } else {
        println!("warning: LIBCLANG_PATH isn't set; maybe run ./mach bootstrap with gecko");
    }
}