build.rs

// Copyright 2020 Parity Technologies
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

extern crate cmake;

use std::env;
use std::fs;

use cmake::Config;

fn main() {
	let src = env::current_dir().unwrap().join("snappy");

	let out = Config::new("snappy")
		.define("CMAKE_VERBOSE_MAKEFILE", "ON")
		.build_target("snappy")
		.build();

	let mut build = out.join("build");

	// NOTE: the cfg! macro doesn't work when cross-compiling, it would return values for the host
	let target_os = env::var("CARGO_CFG_TARGET_OS").expect("CARGO_CFG_TARGET_OS is set by cargo.");
	let target_env = env::var("CARGO_CFG_TARGET_ENV").expect("CARGO_CFG_TARGET_ENV is set by cargo.");

	if target_os.contains("windows") && target_env.contains("msvc") {
		let stub = build.join("snappy-stubs-public.h");

		let profile = match &*env::var("PROFILE").unwrap_or("debug".to_owned()) {
			"bench" | "release" => "Release",
			_ => "Debug",
		};
		build = build.join(profile);

		fs::copy(stub, build.join("snappy-stubs-public.h")).unwrap();
	}

	fs::copy(src.join("snappy.h"), build.join("snappy.h")).unwrap();

	println!("cargo:rustc-link-search=native={}", build.display());
	println!("cargo:rustc-link-lib=static=snappy");
	println!("cargo:include={}", build.display());

	// https://github.com/alexcrichton/cc-rs/blob/ca70fd32c10f8cea805700e944f3a8d1f97d96d4/src/lib.rs#L891
	if target_os.contains("macos") || target_os.contains("freebsd") || target_os.contains("openbsd") {
		println!("cargo:rustc-link-lib=c++");
	} else if !target_env.contains("msvc") && !target_os.contains("android") {
		println!("cargo:rustc-link-lib=stdc++");
	}
}