build.rs

use std::env;
use std::fs;
use std::path::{Path, PathBuf};

fn main() {
    let dst = PathBuf::from(env::var_os("OUT_DIR").unwrap());

    #[cfg(feature = "dynamic")]
    if pkg_config::Config::new()
        .print_system_libs(false)
        .cargo_metadata(true)
        .exactly_version("1.22")
        .probe("libdeflate")
        .is_ok()
    {
        return;
    }

    let mut build = cc::Build::new();

    build
        .files(&[
            "libdeflate/lib/arm/cpu_features.c",
            "libdeflate/lib/x86/cpu_features.c",
            "libdeflate/lib/adler32.c",
            "libdeflate/lib/crc32.c",
            "libdeflate/lib/deflate_compress.c",
            "libdeflate/lib/deflate_decompress.c",
            "libdeflate/lib/gzip_compress.c",
            "libdeflate/lib/gzip_decompress.c",
            "libdeflate/lib/utils.c",
            "libdeflate/lib/zlib_compress.c",
            "libdeflate/lib/zlib_decompress.c",
        ])
        .include("libdeflate")
        .warnings(false)
        .out_dir(dst.join("lib"));

    if cfg!(feature = "freestanding") && !build.get_compiler().is_like_msvc() {
        build
            .flag("-ffreestanding")
            .flag("-nostdlib")
            .define("FREESTANDING", None);
    }

    build.compile("deflate");

    let src = Path::new("libdeflate");
    let include = dst.join("include");
    fs::create_dir_all(&include).unwrap();
    fs::copy(src.join("libdeflate.h"), include.join("libdeflate.h")).unwrap();
    println!("cargo:root={}", dst.display());
    println!("cargo:include={}", include.display());
}