openssl-sys 0.3.3

FFI bindings to OpenSSL
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#![feature(env)]

extern crate "pkg-config" as pkg_config;
extern crate gcc;

use std::env;
use std::default::Default;

fn main() {
    let target = env::var_string("TARGET").unwrap();

    if target.contains("android") {
        let path = env::var_string("OPENSSL_PATH").ok()
            .expect("Android does not provide openssl libraries, please build them yourself \
                     (instructions in the README) and provide their location through \
                     $OPENSSL_PATH.");
        println!("cargo:rustc-flags=-L native={} -l crypto:static -l ssl:static", path);
        // going to assume the user built a new version of openssl
        build_old_openssl_shim(false);
        return;
    }

    if target.contains("win32") || target.contains("win64") {
        println!("cargo:rustc-flags=-l crypto -l ssl -l gdi32 -l wsock32");
        // going to assume the user has a new version of openssl
        build_old_openssl_shim(false);
        return;
    }

    if pkg_config::Config::new().atleast_version("1.0.0").find("openssl").is_ok() {
        build_old_openssl_shim(false);
        return;
    }

    if pkg_config::find_library("openssl").is_ok() {
        build_old_openssl_shim(true);
        return;
    }

    panic!("Unable to find openssl libraries");
}

fn build_old_openssl_shim(is_old: bool) {
        let mut config: gcc::Config = Default::default();
        if is_old {
            config.definitions.push(("OLD_OPENSSL".to_string(), None));
        }

        gcc::compile_library("libold_openssl_shim.a",
                             &config,
                             &["src/old_openssl_shim.c"]);
        let out_dir = env::var_string("OUT_DIR").unwrap();
        println!("cargo:rustc-flags=-L native={} -l old_openssl_shim:static", out_dir);
}