mbedtls 0.8.0

Idiomatic Rust wrapper for MbedTLS, allowing you to use MbedTLS with only safe code while being able to use such great Rust features like error handling and closures. Building on MbedTLS's focus on embedded use, this crate can be used in a no_std environment.
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/* Copyright (c) Fortanix, Inc.
 *
 * Licensed under the GNU General Public License, version 2 <LICENSE-GPL or
 * https://www.gnu.org/licenses/gpl-2.0.html> or the Apache License, Version
 * 2.0 <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0>, at your
 * option. This file may not be copied, modified, or distributed except
 * according to those terms. */

use std::collections::{HashMap, HashSet};
use std::env;

fn main() {
    let env_components = env::var("DEP_MBEDTLS_PLATFORM_COMPONENTS").unwrap();
    let mut sys_platform_components = HashMap::<_, HashSet<_>>::new();
    for mut kv in env_components.split(",").map(|component| component.splitn(2, "=")) {
        let k = kv.next().unwrap();
        let v = kv.next().unwrap();
        sys_platform_components.entry(k).or_insert_with(Default::default).insert(v);
        println!(r#"cargo:rustc-cfg=sys_{}="{}""#, k, v);
    }

    let mut b = cc::Build::new();
    b.include(env::var_os("DEP_MBEDTLS_INCLUDE").unwrap());
    let config_file = format!(r#""{}""#, env::var("DEP_MBEDTLS_CONFIG_H").unwrap());
    b.define("MBEDTLS_CONFIG_FILE",
             Some(config_file.as_str()));
    
    b.file("src/mbedtls_malloc.c");
    b.file("src/rust_printf.c");
    if sys_platform_components.get("c_compiler").map_or(false, |comps| comps.contains("freestanding")) {
        b.flag("-U_FORTIFY_SOURCE")
            .define("_FORTIFY_SOURCE", Some("0"))
            .flag("-ffreestanding");
    }
    b.compile("librust-mbedtls.a");
    // Force correct link order for mbedtls_printf
    println!("cargo:rustc-link-lib=static=mbedtls");
    println!("cargo:rustc-link-lib=static=mbedx509");
    println!("cargo:rustc-link-lib=static=mbedcrypto");
}