// This assumes that either uchardet dev packages are installed where
// `pkg_config` can find them, or that CMake and supporting tools are
// available.  Patches are welcome to help make it work on other operating
// systems!

extern crate pkg_config;
extern crate cmake;

use std::env;
use cmake::Config;

fn main() {
    let target = env::var("TARGET").expect("TARGET was not set");

    // Do nothing if this package is already provided by the system.
    if pkg_config::find_library("uchardet").is_ok() { return; }

    // Build uchardet ourselves
    let mut config = Config::new("uchardet");

    // Mustn't build the binaries as they aren't compatible with Windows
    // and cause a compiler error
    config.define("BUILD_BINARY", "OFF");
    config.define("BUILD_STATIC", "ON");
    config.define("BUILD_SHARED_LIBS", "OFF");

    if target.contains("windows-gnu") {
        // FIXME: This is only needed on newer versions of gcc (>5 ?); Older
        //        versions fail with "unrecognized command line option" and
        //        abort the build; We need to somehow detect the compiler version
        // Disable sized deallocation as we're unable to link when it's enabled
        config.cxxflag("-fno-sized-deallocation");
    }

    // unset the makeflags (jobserver currently has a bug on this system)
    // For more information see https://github.com/alexcrichton/jobserver-rs/issues/4
    if target.contains("windows-gnu") {
        env::set_var("CARGO_MAKEFLAGS", "");
    }

    let dst = config.build();

    // Print out link instructions for Cargo.
    println!("cargo:rustc-link-search=native={}/lib", dst.display());
    println!("cargo:rustc-link-search=native={}/lib64", dst.display());
    println!("cargo:rustc-link-lib=static=uchardet");

    // Not needed on windows-msvc
    if !target.contains("windows-msvc") {
        // Decide how to link our C++ runtime.  Feel free to submit patches
        // to make this work on your platform.  Other likely options are "c++"
        // and "c++abi" depending on OS and compiler.
        let cxx_abi = "stdc++";
        println!("cargo:rustc-flags=-l {}", cxx_abi);
    }

    // make TLS work.  For more information see https://github.com/rust-lang/rust/issues/41607
    // The right fix would be static-nobundle but that is nightly only.
    if target.contains("windows-gnu") {
        println!("cargo:rustc-link-lib=dylib=gcc_eh");
        println!("cargo:rustc-link-lib=dylib=pthread");
    }
}