libdatachannel-sys 0.20.1

Bindings to libdatachannel's C API
Documentation 
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fn rustc_link_search(cmake: &cmake::Config, path: &str) {
    let profile = cmake.get_profile();
    if cfg!(target_env = "msvc") {
        println!("cargo:rustc-link-search={path}/{profile}");
    } else {
        println!("cargo:rustc-link-search={path}")
    }
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let openssl_artifacts = openssl_src::Build::new().build();

    let out_dir = std::env::var("OUT_DIR").unwrap();

    let mut cmake = cmake::Config::new("libdatachannel");
    cmake.build_target("datachannel-static");
    cmake.out_dir(&out_dir);

    cmake.define("NO_WEBSOCKET", "ON");
    cmake.define("NO_EXAMPLES", "ON");
    cmake.define("NO_MEDIA", "ON");
    cmake.define("NO_TESTS", "ON");

    cmake.define(
        "OPENSSL_ROOT_DIR",
        openssl_artifacts.lib_dir().parent().unwrap(),
    );
    cmake.define("OPENSSL_USE_STATIC_LIBS", "TRUE");

    cmake.build();

    cpp_build::Config::new()
        .include(format!("{}/lib", out_dir))
        .build("src/lib.rs");

    println!(
        "cargo:rustc-link-search=native={}",
        openssl_artifacts.lib_dir().to_str().unwrap()
    );

    if cfg!(target_env = "msvc") {
        println!("cargo:rustc-link-lib=static=libcrypto");
        println!("cargo:rustc-link-lib=static=libssl");
    } else {
        println!("cargo:rustc-link-lib=static=crypto");
        println!("cargo:rustc-link-lib=static=ssl");
    }

    rustc_link_search(&cmake, &format!("native={out_dir}/build/deps/libjuice"));
    println!("cargo:rustc-link-lib=static=juice-static");

    rustc_link_search(
        &cmake,
        &format!("native={out_dir}/build/deps/usrsctp/usrsctplib"),
    );
    println!("cargo:rustc-link-lib=static=usrsctp");

    rustc_link_search(&cmake, &format!("native={out_dir}/build"));
    println!("cargo:rustc-link-lib=static=datachannel-static");

    let bindings = bindgen::Builder::default()
        .header("libdatachannel/include/rtc/rtc.h")
        .generate()?;

    let out_path = std::path::PathBuf::from(out_dir);
    bindings.write_to_file(out_path.join("bindings.rs"))?;

    Ok(())
}