liblbfgs-sys 0.1.2

Low level Rust binding to libLBFGS
Documentation 
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use std::env;
use std::fs;

fn fail_on_empty_directory(name: &str) {
    if fs::read_dir(name).unwrap().count() == 0 {
        println!(
            "The `{}` directory is empty, did you forget to pull the submodules?",
            name
        );
        println!("Try `git submodule update --init --recursive`");
        panic!();
    }
}

fn build() {
    let mut cfg = cmake::Config::new("");
    let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap();
    if target_os == "macos" {
        let target_arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap();
        if target_arch == "x86_64" {
            cfg.define("CMAKE_OSX_ARCHITECTURES", "x86_64");
        }
    }
    let dst = cfg.build();

    println!("cargo:rustc-link-search=native={}/lib", dst.display());
    println!("cargo:rustc-link-lib=static=lbfgs");
    println!("cargo:root={}", dst.to_str().unwrap());
    println!("cargo:include={}/include", dst.to_str().unwrap());
}

fn main() {
    fail_on_empty_directory("src/liblbfgs");
    build();
}