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denoland-rusty-v8/build.rs
2020-08-06 03:48:17 +02:00

339 lines
9.8 KiB
Rust

// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
use std::env;
use std::path::Path;
use std::path::PathBuf;
use std::process::exit;
use std::process::Command;
use which::which;
fn main() {
// Detect if trybuild tests are being compiled.
let is_trybuild = env::var_os("DENO_TRYBUILD").is_some();
// Don't build V8 if "cargo doc" is being run. This is to support docs.rs.
let is_cargo_doc = env::var_os("RUSTDOCFLAGS").is_some();
// Don't build V8 if the rust language server (RLS) is running.
let is_rls = env::var_os("CARGO")
.map(PathBuf::from)
.as_ref()
.and_then(|p| p.file_stem())
.and_then(|f| f.to_str())
.map(|s| s.starts_with("rls"))
.unwrap_or(false);
if !(is_trybuild || is_cargo_doc | is_rls) {
if env::var_os("V8_FROM_SOURCE").is_some() {
build_v8()
} else {
download_static_lib_binaries();
}
}
if !(is_cargo_doc || is_rls) {
print_link_flags()
}
}
fn build_v8() {
env::set_var("DEPOT_TOOLS_WIN_TOOLCHAIN", "0");
// cargo publish doesn't like pyc files.
env::set_var("PYTHONDONTWRITEBYTECODE", "1");
// git submodule update --init --recursive
let libcxx_src = PathBuf::from("buildtools/third_party/libc++/trunk/src");
if !libcxx_src.is_dir() {
eprintln!(
"missing source code. Run 'git submodule update --init --recursive'"
);
exit(1);
}
if need_gn_ninja_download() {
download_ninja_gn_binaries();
}
// On windows, rustc cannot link with a V8 debug build.
let mut gn_args = if cargo_gn::is_debug() && !cfg!(target_os = "windows") {
vec!["is_debug=true".to_string()]
} else {
vec!["is_debug=false".to_string()]
};
if !cargo_gn::is_debug() {
gn_args.push("v8_enable_handle_zapping=false".to_string());
}
if let Some(clang_base_path) = find_compatible_system_clang() {
println!("clang_base_path {}", clang_base_path.display());
gn_args.push(format!("clang_base_path={:?}", clang_base_path));
// TODO: Dedupe this with the one from cc_wrapper()
gn_args.push("treat_warnings_as_errors=false".to_string());
// we can't use chromiums clang plugins with a system clang
gn_args.push("clang_use_chrome_plugins=false".to_string());
} else {
let clang_base_path = clang_download();
gn_args.push(format!("clang_base_path={:?}", clang_base_path));
}
if let Some(p) = env::var_os("SCCACHE") {
cc_wrapper(&mut gn_args, &Path::new(&p));
} else if let Ok(p) = which("sccache") {
cc_wrapper(&mut gn_args, &p);
} else {
println!("cargo:warning=Not using sccache");
}
if let Ok(args) = env::var("GN_ARGS") {
for arg in args.split_whitespace() {
gn_args.push(arg.to_string());
}
}
if env::var("TARGET").unwrap() == "aarch64-unknown-linux-gnu" {
gn_args.push(r#"target_cpu="arm64""#.to_string());
gn_args.push("use_sysroot=true".to_string());
maybe_install_sysroot("arm64");
maybe_install_sysroot("amd64");
};
let gn_root = env::var("CARGO_MANIFEST_DIR").unwrap();
let gn_out = cargo_gn::maybe_gen(&gn_root, gn_args);
assert!(gn_out.exists());
assert!(gn_out.join("args.gn").exists());
cargo_gn::build("rusty_v8", None);
}
fn maybe_install_sysroot(arch: &str) {
let sysroot_path = format!("build/linux/debian_sid_{}-sysroot", arch);
if !PathBuf::from(sysroot_path).is_dir() {
let status = Command::new("python")
.arg("./build/linux/sysroot_scripts/install-sysroot.py")
.arg(format!("--arch={}", arch))
.status()
.unwrap_or_else(|_| panic!("sysroot download failed: {}", arch));
assert!(status.success());
}
}
fn platform() -> &'static str {
#[cfg(target_os = "windows")]
{
"win"
}
#[cfg(target_os = "linux")]
{
"linux64"
}
#[cfg(target_os = "macos")]
{
"mac"
}
}
fn download_ninja_gn_binaries() {
let root = env::current_dir().unwrap();
let out_dir = env::var_os("OUT_DIR").expect(
"The 'OUT_DIR' environment is not set (it should be something like \
'target/debug/rusty_v8-{hash}').",
);
let out_dir_abs = root.join(out_dir);
// This would be target/debug or target/release
let target_dir = out_dir_abs
.parent()
.unwrap()
.parent()
.unwrap()
.parent()
.unwrap();
let bin_dir = target_dir
.join("ninja_gn_binaries-20200806")
.join(platform());
let gn = bin_dir.join("gn");
let ninja = bin_dir.join("ninja");
#[cfg(windows)]
let gn = gn.with_extension("exe");
#[cfg(windows)]
let ninja = ninja.with_extension("exe");
if !gn.exists() || !ninja.exists() {
let status = Command::new("python")
.arg("./tools/ninja_gn_binaries.py")
.arg("--dir")
.arg(&target_dir)
.status()
.expect("ninja_gn_binaries.py download failed");
assert!(status.success());
}
assert!(gn.exists());
assert!(ninja.exists());
env::set_var("GN", gn);
env::set_var("NINJA", ninja);
}
fn static_lib_url() -> (String, String) {
let base = "https://github.com/denoland/rusty_v8/releases/download";
let version = env::var("CARGO_PKG_VERSION").unwrap();
let target = env::var("TARGET").unwrap();
if cfg!(target_os = "windows") {
// Note: we always use the release build on windows.
let url = format!("{}/v{}/rusty_v8_release_{}.lib", base, version, target);
let static_lib_name = "rusty_v8.lib".to_string();
(url, static_lib_name)
} else {
let profile = env::var("PROFILE").unwrap();
assert!(profile == "release" || profile == "debug");
let url =
format!("{}/v{}/librusty_v8_{}_{}.a", base, version, profile, target);
let static_lib_name = "librusty_v8.a".to_string();
(url, static_lib_name)
}
}
fn download_file(url: String, filename: PathBuf) {
// Try downloading with python first. Python is a V8 build dependency,
// so this saves us from adding a Rust HTTP client dependency.
println!("Downloading {}", url);
let status = Command::new("python")
.arg("./tools/download_file.py")
.arg("--url")
.arg(&url)
.arg("--filename")
.arg(&filename)
.status();
// Python is only a required dependency for `V8_FROM_SOURCE` builds.
// If python is not available, try falling back to curl.
let status = match status {
Ok(status) if status.success() => status,
_ => {
println!("Python downloader failed, trying with curl.");
Command::new("curl")
.arg("-L")
.arg("-s")
.arg("-o")
.arg(&filename)
.arg(&url)
.status()
.unwrap()
}
};
assert!(status.success());
assert!(filename.exists());
}
fn download_static_lib_binaries() {
let (url, static_lib_name) = static_lib_url();
println!("static lib URL: {}", url);
let root = env::current_dir().unwrap();
// target/debug//build/rusty_v8-d9e5a424d4f96994/out/
let out_dir = env::var_os("OUT_DIR").unwrap();
let out_dir_abs = root.join(out_dir);
// This would be target/debug or target/release
let target_dir = out_dir_abs
.parent()
.unwrap()
.parent()
.unwrap()
.parent()
.unwrap();
let obj_dir = target_dir.join("gn_out").join("obj");
std::fs::create_dir_all(&obj_dir).unwrap();
println!("cargo:rustc-link-search={}", obj_dir.display());
let filename = obj_dir.join(static_lib_name);
if filename.exists() {
println!("static lib already exists {}", filename.display());
println!("To re-download this file, it must be manually deleted.");
} else {
download_file(url, filename);
}
}
fn print_link_flags() {
println!("cargo:rustc-link-lib=static=rusty_v8");
if cfg!(target_os = "windows") {
println!("cargo:rustc-link-lib=dylib=winmm");
println!("cargo:rustc-link-lib=dylib=dbghelp");
}
}
fn need_gn_ninja_download() -> bool {
!((which("ninja").is_ok() || env::var_os("NINJA").is_some())
&& env::var_os("GN").is_some())
}
// Chromiums gn arg clang_base_path is currently compatible with:
// * Apples clang and clang from homebrew's llvm@x packages
// * the official binaries from releases.llvm.org
// * unversioned (Linux) packages of clang (if recent enough)
// but unfortunately it doesn't work with version-suffixed packages commonly
// found in Linux packet managers
fn is_compatible_clang_version(clang_path: &Path) -> bool {
if let Ok(o) = Command::new(clang_path).arg("--version").output() {
let _output = String::from_utf8(o.stdout).unwrap();
// TODO check version output to make sure it's supported.
const _MIN_APPLE_CLANG_VER: f32 = 11.0;
const _MIN_LLVM_CLANG_VER: f32 = 8.0;
return true;
}
false
}
fn find_compatible_system_clang() -> Option<PathBuf> {
if let Ok(p) = env::var("CLANG_BASE_PATH") {
let base_path = Path::new(&p);
let clang_path = base_path.join("bin").join("clang");
if is_compatible_clang_version(&clang_path) {
return Some(base_path.to_path_buf());
}
}
println!("using Chromiums clang");
None
}
// Download chromium's clang into OUT_DIR because Cargo will not allow us to
// modify the source directory.
fn clang_download() -> PathBuf {
let root = env::current_dir().unwrap();
// target/debug//build/rusty_v8-d9e5a424d4f96994/out/
let out_dir = env::var_os("OUT_DIR").unwrap();
let clang_base_path = root
.join(out_dir)
.parent()
.unwrap()
.parent()
.unwrap()
.parent()
.unwrap()
.join("clang");
println!("clang_base_path {}", clang_base_path.display());
let status = Command::new("python")
.arg("./tools/clang/scripts/update.py")
.arg("--output-dir")
.arg(&clang_base_path)
.status()
.expect("clang download failed");
assert!(status.success());
assert!(clang_base_path.exists());
clang_base_path
}
fn cc_wrapper(gn_args: &mut Vec<String>, sccache_path: &Path) {
gn_args.push(format!("cc_wrapper={:?}", sccache_path));
// Disable treat_warnings_as_errors until this sccache bug is fixed:
// https://github.com/mozilla/sccache/issues/264
if cfg!(target_os = "windows") {
gn_args.push("treat_warnings_as_errors=false".to_string());
}
}