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build.rs
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build.rs
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use std::ffi::OsStr;
use std::path::{Path, PathBuf};
use std::{env, fs};
#[cfg(feature = "bindgen")]
fn generate_bindings(defs: Vec<&str>, headerpaths: Vec<PathBuf>) {
let bindings = bindgen::Builder::default()
.header("zstd.h");
#[cfg(feature = "zdict")]
let bindings = bindings.header("zdict.h");
bindings
.blocklist_type("max_align_t")
.size_t_is_usize(true)
.use_core()
.rustified_enum(".*")
.clang_args(
headerpaths
.into_iter()
.map(|path| format!("-I{}", path.display())),
)
.clang_args(defs.into_iter().map(|def| format!("-D{}", def)));
#[cfg(feature = "experimental")]
let bindings = bindings.clang_arg("-DZSTD_STATIC_LINKING_ONLY");
#[cfg(feature = "experimental")]
#[cfg(feature = "zdict")]
let bindings = bindings.clang_arg("-DZDICT_STATIC_LINKING_ONLY");
#[cfg(not(feature = "std"))]
let bindings = bindings.ctypes_prefix("libc");
let bindings = bindings.generate().expect("Unable to generate bindings");
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Could not write bindings");
}
#[cfg(not(feature = "bindgen"))]
fn generate_bindings(_: Vec<&str>, _: Vec<PathBuf>) {}
#[cfg(feature = "pkg-config")]
fn pkg_config() -> (Vec<&'static str>, Vec<PathBuf>) {
let library = pkg_config::Config::new()
.statik(true)
.cargo_metadata(!cfg!(feature = "non-cargo"))
.probe("libzstd")
.expect("Can't probe for zstd in pkg-config");
(vec!["PKG_CONFIG"], library.include_paths)
}
#[cfg(not(feature = "pkg-config"))]
fn pkg_config() -> (Vec<&'static str>, Vec<PathBuf>) {
unimplemented!()
}
#[cfg(not(feature = "legacy"))]
fn set_legacy(_config: &mut cc::Build) {}
#[cfg(feature = "legacy")]
fn set_legacy(config: &mut cc::Build) {
config.define("ZSTD_LEGACY_SUPPORT", Some("1"));
config.include("zstd/lib/legacy");
}
#[cfg(feature = "zstdmt")]
fn set_pthread(config: &mut cc::Build) {
config.flag("-pthread");
}
#[cfg(not(feature = "zstdmt"))]
fn set_pthread(_config: &mut cc::Build) {}
#[cfg(feature = "zstdmt")]
fn enable_threading(config: &mut cc::Build) {
config.define("ZSTD_MULTITHREAD", Some(""));
}
#[cfg(not(feature = "zstdmt"))]
fn enable_threading(_config: &mut cc::Build) {}
fn compile_zstd() {
let mut config = cc::Build::new();
// Search the following directories for C files to add to the compilation.
for dir in &[
"zstd/lib/common",
"zstd/lib/compress",
"zstd/lib/decompress",
#[cfg(feature = "zdict")]
"zstd/lib/dictBuilder",
#[cfg(feature = "legacy")]
"zstd/lib/legacy",
] {
for entry in fs::read_dir(dir).unwrap() {
let path = entry.unwrap().path();
// Skip xxhash*.c files: since we are using the "PRIVATE API"
// mode, it will be inlined in the headers.
if path
.file_name()
.and_then(|p| p.to_str())
.map_or(false, |p| p.contains("xxhash"))
{
continue;
}
if path.extension() == Some(OsStr::new("c")) {
config.file(path);
}
}
}
// Either include ASM files, or disable ASM entirely.
// Also disable it on windows, apparently it doesn't do well with these .S files at the moment.
if cfg!(any(target_os = "windows", feature = "no_asm")) {
config.define("ZSTD_DISABLE_ASM", Some(""));
} else {
config.file("zstd/lib/decompress/huf_decompress_amd64.S");
}
if env::var("CARGO_CFG_TARGET_ARCH").ok() == Some("wasm32".into()) {
println!("cargo:rerun-if-changed=wasm-shim/stdlib.h");
println!("cargo:rerun-if-changed=wasm-shim/string.h");
config.include("wasm-shim/");
config.define("XXH_STATIC_ASSERT", Some("0"));
}
// Some extra parameters
config.opt_level(3);
config.include("zstd/lib/");
config.include("zstd/lib/common");
config.warnings(false);
config.define("ZSTD_LIB_DEPRECATED", Some("0"));
#[cfg(feature = "thin")]
{
config.define("HUF_FORCE_DECOMPRESS_X1", Some("1"));
config.define("ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT", Some("1"));
config.define("ZSTD_NO_INLINE ", Some("1"));
config.flag_if_supported("-flto=thin");
config.flag_if_supported("-Oz");
}
// Hide symbols from resulting library,
// so we can be used with another zstd-linking lib.
// See https://github.com/gyscos/zstd-rs/issues/58
config.flag("-fvisibility=hidden");
config.define("XXH_PRIVATE_API", Some(""));
config.define("ZSTDLIB_VISIBILITY", Some(""));
#[cfg(feature = "zdict")]
config.define("ZDICTLIB_VISIBILITY", Some(""));
config.define("ZSTDERRORLIB_VISIBILITY", Some(""));
// https://github.com/facebook/zstd/blob/d69d08ed6c83563b57d98132e1e3f2487880781e/lib/common/debug.h#L60
/* recommended values for DEBUGLEVEL :
* 0 : release mode, no debug, all run-time checks disabled
* 1 : enables assert() only, no display
* 2 : reserved, for currently active debug path
* 3 : events once per object lifetime (CCtx, CDict, etc.)
* 4 : events once per frame
* 5 : events once per block
* 6 : events once per sequence (verbose)
* 7+: events at every position (*very* verbose)
*/
#[cfg(feature = "debug")]
if env::var("CARGO_CFG_TARGET_ARCH").ok() != Some("wasm32".into()) {
config.define("DEBUGLEVEL", Some("5"));
}
set_pthread(&mut config);
set_legacy(&mut config);
enable_threading(&mut config);
// Compile!
config.compile("libzstd.a");
let src = env::current_dir().unwrap().join("zstd").join("lib");
let dst = PathBuf::from(env::var_os("OUT_DIR").unwrap());
let include = dst.join("include");
fs::create_dir_all(&include).unwrap();
fs::copy(src.join("zstd.h"), include.join("zstd.h")).unwrap();
fs::copy(src.join("zstd_errors.h"), include.join("zstd_errors.h"))
.unwrap();
#[cfg(feature = "zdict")]
fs::copy(src.join("zdict.h"), include.join("zdict.h")).unwrap();
println!("cargo:root={}", dst.display());
}
fn main() {
let target_arch =
std::env::var("CARGO_CFG_TARGET_ARCH").unwrap_or_default();
let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
if target_arch == "wasm32" || target_os == "hermit" {
println!("cargo:rustc-cfg=feature=\"std\"");
}
// println!("cargo:rustc-link-lib=zstd");
let (defs, headerpaths) = if cfg!(feature = "pkg-config") {
pkg_config()
} else {
if !Path::new("zstd/lib").exists() {
panic!("Folder 'zstd/lib' does not exists. Maybe you forgot to clone the 'zstd' submodule?");
}
let manifest_dir = PathBuf::from(
env::var("CARGO_MANIFEST_DIR")
.expect("Manifest dir is always set by cargo"),
);
compile_zstd();
(vec![], vec![manifest_dir.join("zstd/lib")])
};
let includes: Vec<_> = headerpaths
.iter()
.map(|p| p.display().to_string())
.collect();
println!("cargo:include={}", includes.join(";"));
generate_bindings(defs, headerpaths);
}