build.rs


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use std::path::PathBuf;

fn main() {
    if cfg!(not(feature = "tdlib-provided")) {
        build_tdlib();
    }
}

fn build_tdlib() {
    let mut config = cmake::Config::new("td");
    config.very_verbose(true);

    if cfg!(not(feature = "openssl-provided")) {
        let openssl = guess_openssl_location();
        config.define("OPENSSL_ROOT_DIR", openssl);
    }

    let dst = config.build();
    println!("cargo:rustc-link-search={}/lib", dst.display());
}

fn guess_openssl_location() -> PathBuf {
    let mut openssl: Option<PathBuf> = std::env::var("OPENSSL_ROOT_DIR")
        .map(std::convert::Into::into)
        .ok();

    if cfg!(target_os = "macos") && openssl.is_none() {
        let ssl_very_minor_version = 'a'..'z';
        for ver in ssl_very_minor_version.rev() {
            let maybe_path = PathBuf::from(format!("/usr/local/Cellar/openssl@1.1/1.1.1{}", ver));
            if maybe_path.is_dir() {
                openssl = Some(maybe_path);
                break;
            }
        }
    }

    openssl.expect(indoc::indoc! {r#"
        Could not find openssl.
        You must either use feature \"openssl-provided\"
        or provide "OPENSSL_ROOT_DIR" env variable, so tdlib-sys can build
        TDLib from sources.
        "#
    })
}