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use std::env;
use std::fs;
use std::path::PathBuf;
const SKIP_FILENAMES: &[&str] = &["crc32_small", "crc64_small"];
fn main() {
let target = env::var("TARGET").unwrap();
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-env-changed=LZMA_API_STATIC");
let want_static = cfg!(feature = "static") || env::var("LZMA_API_STATIC").is_ok();
let msvc = target.contains("msvc");
// If a static link is desired, we compile from source.
// If we're compiling for MSVC, pkg-config runs a risk of picking up MinGW
// libraries by accident, so disable it.
//
// Otherwise check the system to see if it has an lzma library already
// installed that we can use.
if !want_static && !msvc && pkg_config::probe_library("liblzma").is_ok() {
return;
}
let out_dir = env::var("OUT_DIR").unwrap();
println!("cargo:root={}", out_dir);
let include_dir = env::current_dir().unwrap().join("xz-5.2/src/liblzma/api");
println!("cargo:include={}", include_dir.display());
let src_files = [
"xz-5.2/src/liblzma/common",
"xz-5.2/src/liblzma/lzma",
"xz-5.2/src/liblzma/lz",
"xz-5.2/src/liblzma/check",
"xz-5.2/src/liblzma/delta",
"xz-5.2/src/liblzma/rangecoder",
"xz-5.2/src/liblzma/simple",
]
.iter()
.flat_map(|dir| read_dir_files(dir))
.chain(vec![
"xz-5.2/src/common/tuklib_cpucores.c".into(),
"xz-5.2/src/common/tuklib_physmem.c".into(),
]);
let mut build = cc::Build::new();
build
.files(src_files)
// all C preproc defines are in `./config.h`
.define("HAVE_CONFIG_H", "1")
.include("xz-5.2/src/liblzma/api")
.include("xz-5.2/src/liblzma/lzma")
.include("xz-5.2/src/liblzma/lz")
.include("xz-5.2/src/liblzma/check")
.include("xz-5.2/src/liblzma/simple")
.include("xz-5.2/src/liblzma/delta")
.include("xz-5.2/src/liblzma/common")
.include("xz-5.2/src/liblzma/rangecoder")
.include("xz-5.2/src/common")
.include(env::current_dir().unwrap());
if !target.ends_with("msvc") {
build.flag("-std=c99").flag("-pthread");
}
if let Ok(s) = env::var("CARGO_CFG_TARGET_ENDIAN") {
if s == "big" {
build.define("WORDS_BIGENDIAN", None);
}
}
build.compile("liblzma.a");
}
fn read_dir_files(dir: &str) -> impl Iterator<Item = PathBuf> {
fs::read_dir(dir)
.expect(&format!("failed to read dir {}", dir))
.filter_map(|ent| {
let ent = ent.expect("failed to read entry");
if ent.file_type().unwrap().is_dir() {
return None;
}
let path = ent.path();
if path.extension().unwrap() != "c" {
return None;
}
{
let file_stem = path.file_stem().unwrap().to_str().unwrap();
if SKIP_FILENAMES.contains(&file_stem) {
return None;
}
if file_stem.ends_with("tablegen") {
return None;
}
}
Some(path)
})
}
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