1 //! Compilation of native dependencies like LLVM.
3 //! Native projects like LLVM unfortunately aren't suited just yet for
4 //! compilation in build scripts that Cargo has. This is because the
5 //! compilation takes a *very* long time but also because we don't want to
6 //! compile LLVM 3 times as part of a normal bootstrap (we want it cached).
8 //! LLVM and compiler-rt are essentially just wired up to everything else to
9 //! ensure that they're always in place if needed.
12 use std::env::consts::EXE_EXTENSION;
13 use std::ffi::{OsStr, OsString};
14 use std::fs::{self, File};
16 use std::path::{Path, PathBuf};
17 use std::process::Command;
19 use crate::builder::{Builder, RunConfig, ShouldRun, Step};
20 use crate::config::TargetSelection;
21 use crate::util::{self, exe, output, program_out_of_date, t, up_to_date};
22 use crate::{CLang, GitRepo};
26 build_llvm_config: PathBuf,
31 // Linker flags to pass to LLVM's CMake invocation.
32 #[derive(Debug, Clone, Default)]
34 // CMAKE_EXE_LINKER_FLAGS
36 // CMAKE_SHARED_LINKER_FLAGS
38 // CMAKE_MODULE_LINKER_FLAGS
43 fn push_all(&mut self, s: impl AsRef<OsStr>) {
47 self.shared.push(" ");
49 self.module.push(" ");
54 // This returns whether we've already previously built LLVM.
56 // It's used to avoid busting caches during x.py check -- if we've already built
57 // LLVM, it's fine for us to not try to avoid doing so.
59 // This will return the llvm-config if it can get it (but it will not build it
61 pub fn prebuilt_llvm_config(
62 builder: &Builder<'_>,
63 target: TargetSelection,
64 ) -> Result<PathBuf, Meta> {
65 maybe_download_ci_llvm(builder);
67 // If we're using a custom LLVM bail out here, but we can only use a
68 // custom LLVM for the build triple.
69 if let Some(config) = builder.config.target_config.get(&target) {
70 if let Some(ref s) = config.llvm_config {
71 check_llvm_version(builder, s);
72 return Ok(s.to_path_buf());
76 let root = "src/llvm-project/llvm";
77 let out_dir = builder.llvm_out(target);
79 let mut llvm_config_ret_dir = builder.llvm_out(builder.config.build);
80 if !builder.config.build.contains("msvc") || builder.ninja() {
81 llvm_config_ret_dir.push("build");
83 llvm_config_ret_dir.push("bin");
85 let build_llvm_config = llvm_config_ret_dir.join(exe("llvm-config", builder.config.build));
87 let stamp = out_dir.join("llvm-finished-building");
88 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
90 if builder.config.llvm_skip_rebuild && stamp.path.exists() {
93 Using a potentially stale build of LLVM; \
94 This may not behave well.",
96 return Ok(build_llvm_config);
100 if stamp.hash.is_none() {
102 "Could not determine the LLVM submodule commit hash. \
103 Assuming that an LLVM rebuild is not necessary.",
105 builder.info(&format!(
106 "To force LLVM to rebuild, remove the file `{}`",
110 return Ok(build_llvm_config);
113 Err(Meta { stamp, build_llvm_config, out_dir, root: root.into() })
116 pub(crate) fn maybe_download_ci_llvm(builder: &Builder<'_>) {
117 let config = &builder.config;
118 if !config.llvm_from_ci {
121 let mut rev_list = Command::new("git");
123 PathBuf::from("rev-list"),
124 "--author=bors@rust-lang.org".into(),
126 "--first-parent".into(),
129 builder.src.join("src/llvm-project"),
130 builder.src.join("src/bootstrap/download-ci-llvm-stamp"),
131 // the LLVM shared object file is named `LLVM-12-rust-{version}-nightly`
132 builder.src.join("src/version"),
134 let llvm_sha = output(&mut rev_list);
135 let llvm_sha = llvm_sha.trim();
138 eprintln!("error: could not find commit hash for downloading LLVM");
139 eprintln!("help: maybe your repository history is too shallow?");
140 eprintln!("help: consider disabling `download-ci-llvm`");
141 eprintln!("help: or fetch enough history to include one upstream commit");
145 let llvm_root = config.ci_llvm_root();
146 let llvm_stamp = llvm_root.join(".llvm-stamp");
147 let key = format!("{}{}", llvm_sha, config.llvm_assertions);
148 if program_out_of_date(&llvm_stamp, &key) && !config.dry_run {
149 download_ci_llvm(builder, &llvm_sha);
150 for binary in ["llvm-config", "FileCheck"] {
151 builder.fix_bin_or_dylib(&llvm_root.join("bin").join(binary));
153 let llvm_lib = llvm_root.join("lib");
154 for entry in t!(fs::read_dir(&llvm_lib)) {
155 let lib = t!(entry).path();
156 if lib.extension().map_or(false, |ext| ext == "so") {
157 builder.fix_bin_or_dylib(&lib);
160 t!(fs::write(llvm_stamp, key));
164 fn download_ci_llvm(builder: &Builder<'_>, llvm_sha: &str) {
165 let llvm_assertions = builder.config.llvm_assertions;
167 let cache_prefix = format!("llvm-{}-{}", llvm_sha, llvm_assertions);
168 let cache_dst = builder.out.join("cache");
169 let rustc_cache = cache_dst.join(cache_prefix);
170 if !rustc_cache.exists() {
171 t!(fs::create_dir_all(&rustc_cache));
173 let base = "https://ci-artifacts.rust-lang.org";
174 let url = if llvm_assertions {
175 format!("rustc-builds-alt/{}", llvm_sha)
177 format!("rustc-builds/{}", llvm_sha)
179 let filename = format!("rust-dev-nightly-{}.tar.xz", builder.build.build.triple);
180 let tarball = rustc_cache.join(&filename);
181 if !tarball.exists() {
182 let help_on_error = "error: failed to download llvm from ci\n
183 \nhelp: old builds get deleted after a certain time
184 \nhelp: if trying to compile an old commit of rustc, disable `download-ci-llvm` in config.toml:
187 \ndownload-ci-llvm = false
190 builder.download_component(base, &format!("{}/{}", url, filename), &tarball, help_on_error);
192 let llvm_root = builder.config.ci_llvm_root();
193 builder.unpack(&tarball, &llvm_root, "rust-dev");
196 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
198 pub target: TargetSelection,
202 type Output = PathBuf; // path to llvm-config
204 const ONLY_HOSTS: bool = true;
206 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
207 run.path("src/llvm-project").path("src/llvm-project/llvm")
210 fn make_run(run: RunConfig<'_>) {
211 run.builder.ensure(Llvm { target: run.target });
214 /// Compile LLVM for `target`.
215 fn run(self, builder: &Builder<'_>) -> PathBuf {
216 let target = self.target;
217 let target_native = if self.target.starts_with("riscv") {
218 // RISC-V target triples in Rust is not named the same as C compiler target triples.
219 // This converts Rust RISC-V target triples to C compiler triples.
220 let idx = target.triple.find('-').unwrap();
222 format!("riscv{}{}", &target.triple[5..7], &target.triple[idx..])
223 } else if self.target.starts_with("powerpc") && self.target.ends_with("freebsd") {
224 // FreeBSD 13 had incompatible ABI changes on all PowerPC platforms.
225 // Set the version suffix to 13.0 so the correct target details are used.
226 format!("{}{}", self.target, "13.0")
231 let Meta { stamp, build_llvm_config, out_dir, root } =
232 match prebuilt_llvm_config(builder, target) {
237 builder.update_submodule(&Path::new("src").join("llvm-project"));
238 if builder.llvm_link_shared()
239 && (target.contains("windows") || target.contains("apple-darwin"))
241 panic!("shared linking to LLVM is not currently supported on {}", target.triple);
244 builder.info(&format!("Building LLVM for {}", target));
246 let _time = util::timeit(&builder);
247 t!(fs::create_dir_all(&out_dir));
249 // https://llvm.org/docs/CMake.html
250 let mut cfg = cmake::Config::new(builder.src.join(root));
251 let mut ldflags = LdFlags::default();
253 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
254 (false, _) => "Debug",
255 (true, false) => "Release",
256 (true, true) => "RelWithDebInfo",
259 // NOTE: remember to also update `config.toml.example` when changing the
261 let llvm_targets = match &builder.config.llvm_targets {
264 "AArch64;ARM;BPF;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;\
265 Sparc;SystemZ;WebAssembly;X86"
269 let llvm_exp_targets = match builder.config.llvm_experimental_targets {
274 let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
275 let plugins = if builder.config.llvm_plugins { "ON" } else { "OFF" };
276 let enable_tests = if builder.config.llvm_tests { "ON" } else { "OFF" };
278 cfg.out_dir(&out_dir)
280 .define("LLVM_ENABLE_ASSERTIONS", assertions)
281 .define("LLVM_ENABLE_PLUGINS", plugins)
282 .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
283 .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
284 .define("LLVM_INCLUDE_EXAMPLES", "OFF")
285 .define("LLVM_INCLUDE_DOCS", "OFF")
286 .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
287 .define("LLVM_INCLUDE_TESTS", enable_tests)
288 .define("LLVM_ENABLE_TERMINFO", "OFF")
289 .define("LLVM_ENABLE_LIBEDIT", "OFF")
290 .define("LLVM_ENABLE_BINDINGS", "OFF")
291 .define("LLVM_ENABLE_Z3_SOLVER", "OFF")
292 .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
293 .define("LLVM_TARGET_ARCH", target_native.split('-').next().unwrap())
294 .define("LLVM_DEFAULT_TARGET_TRIPLE", target_native);
296 // Parts of our test suite rely on the `FileCheck` tool, which is built by default in
297 // `build/$TARGET/llvm/build/bin` is but *not* then installed to `build/$TARGET/llvm/bin`.
298 // This flag makes sure `FileCheck` is copied in the final binaries directory.
299 cfg.define("LLVM_INSTALL_UTILS", "ON");
301 if builder.config.llvm_profile_generate {
302 cfg.define("LLVM_BUILD_INSTRUMENTED", "IR");
303 cfg.define("LLVM_BUILD_RUNTIME", "No");
305 if let Some(path) = builder.config.llvm_profile_use.as_ref() {
306 cfg.define("LLVM_PROFDATA_FILE", &path);
309 if target != "aarch64-apple-darwin" && !target.contains("windows") {
310 cfg.define("LLVM_ENABLE_ZLIB", "ON");
312 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
315 // Are we compiling for iOS/tvOS?
316 if target.contains("apple-ios") || target.contains("apple-tvos") {
317 // These two defines prevent CMake from automatically trying to add a MacOSX sysroot, which leads to a compiler error.
318 cfg.define("CMAKE_OSX_SYSROOT", "/");
319 cfg.define("CMAKE_OSX_DEPLOYMENT_TARGET", "");
320 // Prevent cmake from adding -bundle to CFLAGS automatically, which leads to a compiler error because "-bitcode_bundle" also gets added.
321 cfg.define("LLVM_ENABLE_PLUGINS", "OFF");
322 // Zlib fails to link properly, leading to a compiler error.
323 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
326 if builder.config.llvm_thin_lto {
327 cfg.define("LLVM_ENABLE_LTO", "Thin");
328 if !target.contains("apple") {
329 cfg.define("LLVM_ENABLE_LLD", "ON");
333 // This setting makes the LLVM tools link to the dynamic LLVM library,
334 // which saves both memory during parallel links and overall disk space
335 // for the tools. We don't do this on every platform as it doesn't work
336 // equally well everywhere.
338 // If we're not linking rustc to a dynamic LLVM, though, then don't link
340 if builder.llvm_link_tools_dynamically(target) && builder.llvm_link_shared() {
341 cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
344 if target.starts_with("riscv") && !target.contains("freebsd") {
345 // RISC-V GCC erroneously requires linking against
346 // `libatomic` when using 1-byte and 2-byte C++
347 // atomics but the LLVM build system check cannot
348 // detect this. Therefore it is set manually here.
349 // FreeBSD uses Clang as its system compiler and
350 // provides no libatomic in its base system so does
352 ldflags.exe.push(" -latomic");
353 ldflags.shared.push(" -latomic");
356 if target.contains("msvc") {
357 cfg.define("LLVM_USE_CRT_DEBUG", "MT");
358 cfg.define("LLVM_USE_CRT_RELEASE", "MT");
359 cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
360 cfg.static_crt(true);
363 if target.starts_with("i686") {
364 cfg.define("LLVM_BUILD_32_BITS", "ON");
367 let mut enabled_llvm_projects = Vec::new();
369 if util::forcing_clang_based_tests() {
370 enabled_llvm_projects.push("clang");
371 enabled_llvm_projects.push("compiler-rt");
374 if builder.config.llvm_polly {
375 enabled_llvm_projects.push("polly");
378 if builder.config.llvm_clang {
379 enabled_llvm_projects.push("clang");
382 // We want libxml to be disabled.
383 // See https://github.com/rust-lang/rust/pull/50104
384 cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
386 if !enabled_llvm_projects.is_empty() {
387 enabled_llvm_projects.sort();
388 enabled_llvm_projects.dedup();
389 cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
392 if let Some(num_linkers) = builder.config.llvm_link_jobs {
394 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
398 // Workaround for ppc32 lld limitation
399 if target == "powerpc-unknown-freebsd" {
400 ldflags.exe.push(" -fuse-ld=bfd");
403 // https://llvm.org/docs/HowToCrossCompileLLVM.html
404 if target != builder.config.build {
405 builder.ensure(Llvm { target: builder.config.build });
406 // FIXME: if the llvm root for the build triple is overridden then we
407 // should use llvm-tblgen from there, also should verify that it
408 // actually exists most of the time in normal installs of LLVM.
409 let host_bin = builder.llvm_out(builder.config.build).join("bin");
410 cfg.define("CMAKE_CROSSCOMPILING", "True");
411 cfg.define("LLVM_TABLEGEN", host_bin.join("llvm-tblgen").with_extension(EXE_EXTENSION));
412 cfg.define("LLVM_NM", host_bin.join("llvm-nm").with_extension(EXE_EXTENSION));
415 host_bin.join("llvm-config").with_extension(EXE_EXTENSION),
419 if let Some(ref suffix) = builder.config.llvm_version_suffix {
420 // Allow version-suffix="" to not define a version suffix at all.
421 if !suffix.is_empty() {
422 cfg.define("LLVM_VERSION_SUFFIX", suffix);
424 } else if builder.config.channel == "dev" {
425 // Changes to a version suffix require a complete rebuild of the LLVM.
426 // To avoid rebuilds during a time of version bump, don't include rustc
427 // release number on the dev channel.
428 cfg.define("LLVM_VERSION_SUFFIX", "-rust-dev");
430 let suffix = format!("-rust-{}-{}", builder.version, builder.config.channel);
431 cfg.define("LLVM_VERSION_SUFFIX", suffix);
434 if let Some(ref linker) = builder.config.llvm_use_linker {
435 cfg.define("LLVM_USE_LINKER", linker);
438 if builder.config.llvm_allow_old_toolchain {
439 cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
442 configure_cmake(builder, target, &mut cfg, true, ldflags);
444 for (key, val) in &builder.config.llvm_build_config {
445 cfg.define(key, val);
448 // FIXME: we don't actually need to build all LLVM tools and all LLVM
449 // libraries here, e.g., we just want a few components and a few
450 // tools. Figure out how to filter them down and only build the right
451 // tools and libs on all platforms.
453 if builder.config.dry_run {
454 return build_llvm_config;
465 fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
466 if !builder.config.llvm_version_check {
470 if builder.config.dry_run {
474 let mut cmd = Command::new(llvm_config);
475 let version = output(cmd.arg("--version"));
476 let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
477 if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
482 panic!("\n\nbad LLVM version: {}, need >=12.0\n\n", version)
486 builder: &Builder<'_>,
487 target: TargetSelection,
488 cfg: &mut cmake::Config,
489 use_compiler_launcher: bool,
490 mut ldflags: LdFlags,
492 // Do not print installation messages for up-to-date files.
493 // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
494 cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
496 // Do not allow the user's value of DESTDIR to influence where
497 // LLVM will install itself. LLVM must always be installed in our
498 // own build directories.
499 cfg.env("DESTDIR", "");
502 cfg.generator("Ninja");
504 cfg.target(&target.triple).host(&builder.config.build.triple);
506 if target != builder.config.build {
507 if target.contains("netbsd") {
508 cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
509 } else if target.contains("freebsd") {
510 cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
511 } else if target.contains("windows") {
512 cfg.define("CMAKE_SYSTEM_NAME", "Windows");
513 } else if target.contains("haiku") {
514 cfg.define("CMAKE_SYSTEM_NAME", "Haiku");
515 } else if target.contains("solaris") || target.contains("illumos") {
516 cfg.define("CMAKE_SYSTEM_NAME", "SunOS");
518 // When cross-compiling we should also set CMAKE_SYSTEM_VERSION, but in
519 // that case like CMake we cannot easily determine system version either.
521 // Since, the LLVM itself makes rather limited use of version checks in
522 // CMakeFiles (and then only in tests), and so far no issues have been
523 // reported, the system version is currently left unset.
526 let sanitize_cc = |cc: &Path| {
527 if target.contains("msvc") {
528 OsString::from(cc.to_str().unwrap().replace("\\", "/"))
530 cc.as_os_str().to_owned()
534 // MSVC with CMake uses msbuild by default which doesn't respect these
535 // vars that we'd otherwise configure. In that case we just skip this
537 if target.contains("msvc") && !builder.ninja() {
541 let (cc, cxx) = match builder.config.llvm_clang_cl {
542 Some(ref cl) => (cl.as_ref(), cl.as_ref()),
543 None => (builder.cc(target), builder.cxx(target).unwrap()),
546 // Handle msvc + ninja + ccache specially (this is what the bots use)
547 if target.contains("msvc") && builder.ninja() && builder.config.ccache.is_some() {
548 let mut wrap_cc = env::current_exe().expect("failed to get cwd");
549 wrap_cc.set_file_name("sccache-plus-cl.exe");
551 cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
552 .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
553 cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
554 .env("SCCACHE_TARGET", target.triple)
555 .env("SCCACHE_CC", &cc)
556 .env("SCCACHE_CXX", &cxx);
558 // Building LLVM on MSVC can be a little ludicrous at times. We're so far
559 // off the beaten path here that I'm not really sure this is even half
560 // supported any more. Here we're trying to:
562 // * Build LLVM on MSVC
563 // * Build LLVM with `clang-cl` instead of `cl.exe`
564 // * Build a project with `sccache`
565 // * Build for 32-bit as well
566 // * Build with Ninja
568 // For `cl.exe` there are different binaries to compile 32/64 bit which
569 // we use but for `clang-cl` there's only one which internally
570 // multiplexes via flags. As a result it appears that CMake's detection
571 // of a compiler's architecture and such on MSVC **doesn't** pass any
572 // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
573 // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
574 // definitely causes problems since all the env vars are pointing to
577 // To hack around this... again... we pass an argument that's
578 // unconditionally passed in the sccache shim. This'll get CMake to
579 // correctly diagnose it's doing a 32-bit compilation and LLVM will
580 // internally configure itself appropriately.
581 if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
582 cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
585 // If ccache is configured we inform the build a little differently how
586 // to invoke ccache while also invoking our compilers.
587 if use_compiler_launcher {
588 if let Some(ref ccache) = builder.config.ccache {
589 cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
590 .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
593 cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
594 .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx))
595 .define("CMAKE_ASM_COMPILER", sanitize_cc(cc));
598 cfg.build_arg("-j").build_arg(builder.jobs().to_string());
599 let mut cflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::C).join(" ").into();
600 if let Some(ref s) = builder.config.llvm_cflags {
604 // Some compiler features used by LLVM (such as thread locals) will not work on a min version below iOS 10.
605 if target.contains("apple-ios") {
606 if target.contains("86-") {
607 cflags.push(" -miphonesimulator-version-min=10.0");
609 cflags.push(" -miphoneos-version-min=10.0");
612 if builder.config.llvm_clang_cl.is_some() {
613 cflags.push(&format!(" --target={}", target));
615 cfg.define("CMAKE_C_FLAGS", cflags);
616 let mut cxxflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::Cxx).join(" ").into();
617 if let Some(ref s) = builder.config.llvm_cxxflags {
621 if builder.config.llvm_clang_cl.is_some() {
622 cxxflags.push(&format!(" --target={}", target));
624 cfg.define("CMAKE_CXX_FLAGS", cxxflags);
625 if let Some(ar) = builder.ar(target) {
626 if ar.is_absolute() {
627 // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
628 // tries to resolve this path in the LLVM build directory.
629 cfg.define("CMAKE_AR", sanitize_cc(ar));
633 if let Some(ranlib) = builder.ranlib(target) {
634 if ranlib.is_absolute() {
635 // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
636 // tries to resolve this path in the LLVM build directory.
637 cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
641 if let Some(ref flags) = builder.config.llvm_ldflags {
642 ldflags.push_all(flags);
645 if let Some(flags) = get_var("LDFLAGS", &builder.config.build.triple, &target.triple) {
646 ldflags.push_all(&flags);
649 // For distribution we want the LLVM tools to be *statically* linked to libstdc++.
650 // We also do this if the user explicitly requested static libstdc++.
651 if builder.config.llvm_static_stdcpp {
652 if !target.contains("msvc") && !target.contains("netbsd") {
653 if target.contains("apple") || target.contains("windows") {
654 ldflags.push_all("-static-libstdc++");
656 ldflags.push_all("-Wl,-Bsymbolic -static-libstdc++");
661 cfg.define("CMAKE_SHARED_LINKER_FLAGS", &ldflags.shared);
662 cfg.define("CMAKE_MODULE_LINKER_FLAGS", &ldflags.module);
663 cfg.define("CMAKE_EXE_LINKER_FLAGS", &ldflags.exe);
665 if env::var_os("SCCACHE_ERROR_LOG").is_some() {
666 cfg.env("RUSTC_LOG", "sccache=warn");
670 // Adapted from https://github.com/alexcrichton/cc-rs/blob/fba7feded71ee4f63cfe885673ead6d7b4f2f454/src/lib.rs#L2347-L2365
671 fn get_var(var_base: &str, host: &str, target: &str) -> Option<OsString> {
672 let kind = if host == target { "HOST" } else { "TARGET" };
673 let target_u = target.replace("-", "_");
674 env::var_os(&format!("{}_{}", var_base, target))
675 .or_else(|| env::var_os(&format!("{}_{}", var_base, target_u)))
676 .or_else(|| env::var_os(&format!("{}_{}", kind, var_base)))
677 .or_else(|| env::var_os(var_base))
680 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
682 pub target: TargetSelection,
686 type Output = PathBuf;
687 const ONLY_HOSTS: bool = true;
689 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
690 run.path("src/llvm-project/lld")
693 fn make_run(run: RunConfig<'_>) {
694 run.builder.ensure(Lld { target: run.target });
697 /// Compile LLD for `target`.
698 fn run(self, builder: &Builder<'_>) -> PathBuf {
699 if builder.config.dry_run {
700 return PathBuf::from("lld-out-dir-test-gen");
702 let target = self.target;
704 let llvm_config = builder.ensure(Llvm { target: self.target });
706 let out_dir = builder.lld_out(target);
707 let done_stamp = out_dir.join("lld-finished-building");
708 if done_stamp.exists() {
712 builder.info(&format!("Building LLD for {}", target));
713 let _time = util::timeit(&builder);
714 t!(fs::create_dir_all(&out_dir));
716 let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
717 configure_cmake(builder, target, &mut cfg, true, LdFlags::default());
719 // This is an awful, awful hack. Discovered when we migrated to using
720 // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
721 // tree, will execute `llvm-config --cmakedir` and then tell CMake about
722 // that directory for later processing. Unfortunately if this path has
723 // forward slashes in it (which it basically always does on Windows)
724 // then CMake will hit a syntax error later on as... something isn't
727 // Instead of attempting to fix this problem in upstream CMake and/or
728 // LLVM/LLD we just hack around it here. This thin wrapper will take the
729 // output from llvm-config and replace all instances of `\` with `/` to
730 // ensure we don't hit the same bugs with escaping. It means that you
731 // can't build on a system where your paths require `\` on Windows, but
732 // there's probably a lot of reasons you can't do that other than this.
733 let llvm_config_shim = env::current_exe().unwrap().with_file_name("llvm-config-wrapper");
735 // Re-use the same flags as llvm to control the level of debug information
736 // generated for lld.
737 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
738 (false, _) => "Debug",
739 (true, false) => "Release",
740 (true, true) => "RelWithDebInfo",
743 cfg.out_dir(&out_dir)
745 .env("LLVM_CONFIG_REAL", &llvm_config)
746 .define("LLVM_CONFIG_PATH", llvm_config_shim)
747 .define("LLVM_INCLUDE_TESTS", "OFF");
749 if builder.config.llvm_allow_old_toolchain {
750 cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
753 // While we're using this horrible workaround to shim the execution of
754 // llvm-config, let's just pile on more. I can't seem to figure out how
755 // to build LLD as a standalone project and also cross-compile it at the
756 // same time. It wants a natively executable `llvm-config` to learn
757 // about LLVM, but then it learns about all the host configuration of
758 // LLVM and tries to link to host LLVM libraries.
760 // To work around that we tell our shim to replace anything with the
761 // build target with the actual target instead. This'll break parts of
762 // LLD though which try to execute host tools, such as llvm-tblgen, so
763 // we specifically tell it where to find those. This is likely super
764 // brittle and will break over time. If anyone knows better how to
765 // cross-compile LLD it would be much appreciated to fix this!
766 if target != builder.config.build {
767 cfg.env("LLVM_CONFIG_SHIM_REPLACE", &builder.config.build.triple)
768 .env("LLVM_CONFIG_SHIM_REPLACE_WITH", &target.triple)
771 llvm_config.with_file_name("llvm-tblgen").with_extension(EXE_EXTENSION),
775 // Explicitly set C++ standard, because upstream doesn't do so
776 // for standalone builds.
777 cfg.define("CMAKE_CXX_STANDARD", "14");
781 t!(File::create(&done_stamp));
786 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
787 pub struct TestHelpers {
788 pub target: TargetSelection,
791 impl Step for TestHelpers {
794 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
795 run.path("src/test/auxiliary/rust_test_helpers.c")
798 fn make_run(run: RunConfig<'_>) {
799 run.builder.ensure(TestHelpers { target: run.target })
802 /// Compiles the `rust_test_helpers.c` library which we used in various
803 /// `run-pass` tests for ABI testing.
804 fn run(self, builder: &Builder<'_>) {
805 if builder.config.dry_run {
808 // The x86_64-fortanix-unknown-sgx target doesn't have a working C
809 // toolchain. However, some x86_64 ELF objects can be linked
810 // without issues. Use this hack to compile the test helpers.
811 let target = if self.target == "x86_64-fortanix-unknown-sgx" {
812 TargetSelection::from_user("x86_64-unknown-linux-gnu")
816 let dst = builder.test_helpers_out(target);
817 let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
818 if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
822 builder.info("Building test helpers");
823 t!(fs::create_dir_all(&dst));
824 let mut cfg = cc::Build::new();
825 // FIXME: Workaround for https://github.com/emscripten-core/emscripten/issues/9013
826 if target.contains("emscripten") {
830 // We may have found various cross-compilers a little differently due to our
831 // extra configuration, so inform cc of these compilers. Note, though, that
832 // on MSVC we still need cc's detection of env vars (ugh).
833 if !target.contains("msvc") {
834 if let Some(ar) = builder.ar(target) {
837 cfg.compiler(builder.cc(target));
839 cfg.cargo_metadata(false)
841 .target(&target.triple)
842 .host(&builder.config.build.triple)
846 .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
847 .compile("rust_test_helpers");
851 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
852 pub struct Sanitizers {
853 pub target: TargetSelection,
856 impl Step for Sanitizers {
857 type Output = Vec<SanitizerRuntime>;
859 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
860 run.alias("sanitizers")
863 fn make_run(run: RunConfig<'_>) {
864 run.builder.ensure(Sanitizers { target: run.target });
867 /// Builds sanitizer runtime libraries.
868 fn run(self, builder: &Builder<'_>) -> Self::Output {
869 let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
870 if !compiler_rt_dir.exists() {
874 let out_dir = builder.native_dir(self.target).join("sanitizers");
875 let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
876 if runtimes.is_empty() {
880 let llvm_config = builder.ensure(Llvm { target: builder.config.build });
881 if builder.config.dry_run {
885 let stamp = out_dir.join("sanitizers-finished-building");
886 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
889 if stamp.hash.is_none() {
890 builder.info(&format!(
891 "Rebuild sanitizers by removing the file `{}`",
898 builder.info(&format!("Building sanitizers for {}", self.target));
900 let _time = util::timeit(&builder);
902 let mut cfg = cmake::Config::new(&compiler_rt_dir);
903 cfg.profile("Release");
904 cfg.define("CMAKE_C_COMPILER_TARGET", self.target.triple);
905 cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
906 cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
907 cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
908 cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
909 cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
910 cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
911 cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
912 cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
913 cfg.define("LLVM_CONFIG_PATH", &llvm_config);
915 // On Darwin targets the sanitizer runtimes are build as universal binaries.
916 // Unfortunately sccache currently lacks support to build them successfully.
917 // Disable compiler launcher on Darwin targets to avoid potential issues.
918 let use_compiler_launcher = !self.target.contains("apple-darwin");
919 configure_cmake(builder, self.target, &mut cfg, use_compiler_launcher, LdFlags::default());
921 t!(fs::create_dir_all(&out_dir));
922 cfg.out_dir(out_dir);
924 for runtime in &runtimes {
925 cfg.build_target(&runtime.cmake_target);
934 #[derive(Clone, Debug)]
935 pub struct SanitizerRuntime {
936 /// CMake target used to build the runtime.
937 pub cmake_target: String,
938 /// Path to the built runtime library.
940 /// Library filename that will be used rustc.
944 /// Returns sanitizers available on a given target.
945 fn supported_sanitizers(
947 target: TargetSelection,
949 ) -> Vec<SanitizerRuntime> {
950 let darwin_libs = |os: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
953 .map(move |c| SanitizerRuntime {
954 cmake_target: format!("clang_rt.{}_{}_dynamic", c, os),
956 .join(&format!("build/lib/darwin/libclang_rt.{}_{}_dynamic.dylib", c, os)),
957 name: format!("librustc-{}_rt.{}.dylib", channel, c),
962 let common_libs = |os: &str, arch: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
965 .map(move |c| SanitizerRuntime {
966 cmake_target: format!("clang_rt.{}-{}", c, arch),
967 path: out_dir.join(&format!("build/lib/{}/libclang_rt.{}-{}.a", os, c, arch)),
968 name: format!("librustc-{}_rt.{}.a", channel, c),
973 match &*target.triple {
974 "aarch64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
975 "aarch64-fuchsia" => common_libs("fuchsia", "aarch64", &["asan"]),
976 "aarch64-unknown-linux-gnu" => {
977 common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan", "hwasan"])
979 "x86_64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
980 "x86_64-fuchsia" => common_libs("fuchsia", "x86_64", &["asan"]),
981 "x86_64-unknown-freebsd" => common_libs("freebsd", "x86_64", &["asan", "msan", "tsan"]),
982 "x86_64-unknown-netbsd" => {
983 common_libs("netbsd", "x86_64", &["asan", "lsan", "msan", "tsan"])
985 "x86_64-unknown-illumos" => common_libs("illumos", "x86_64", &["asan"]),
986 "x86_64-pc-solaris" => common_libs("solaris", "x86_64", &["asan"]),
987 "x86_64-unknown-linux-gnu" => {
988 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
990 "x86_64-unknown-linux-musl" => {
991 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
999 hash: Option<Vec<u8>>,
1003 fn new(path: PathBuf, hash: Option<&str>) -> Self {
1004 HashStamp { path, hash: hash.map(|s| s.as_bytes().to_owned()) }
1007 fn is_done(&self) -> bool {
1008 match fs::read(&self.path) {
1009 Ok(h) => self.hash.as_deref().unwrap_or(b"") == h.as_slice(),
1010 Err(e) if e.kind() == io::ErrorKind::NotFound => false,
1012 panic!("failed to read stamp file `{}`: {}", self.path.display(), e);
1017 fn remove(&self) -> io::Result<()> {
1018 match fs::remove_file(&self.path) {
1021 if e.kind() == io::ErrorKind::NotFound {
1030 fn write(&self) -> io::Result<()> {
1031 fs::write(&self.path, self.hash.as_deref().unwrap_or(b""))
1035 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1036 pub struct CrtBeginEnd {
1037 pub target: TargetSelection,
1040 impl Step for CrtBeginEnd {
1041 type Output = PathBuf;
1043 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1044 run.path("src/llvm-project/compiler-rt/lib/crt")
1047 fn make_run(run: RunConfig<'_>) {
1048 run.builder.ensure(CrtBeginEnd { target: run.target });
1051 /// Build crtbegin.o/crtend.o for musl target.
1052 fn run(self, builder: &Builder<'_>) -> Self::Output {
1053 let out_dir = builder.native_dir(self.target).join("crt");
1055 if builder.config.dry_run {
1059 let crtbegin_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtbegin.c");
1060 let crtend_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtend.c");
1061 if up_to_date(&crtbegin_src, &out_dir.join("crtbegin.o"))
1062 && up_to_date(&crtend_src, &out_dir.join("crtendS.o"))
1067 builder.info("Building crtbegin.o and crtend.o");
1068 t!(fs::create_dir_all(&out_dir));
1070 let mut cfg = cc::Build::new();
1072 if let Some(ar) = builder.ar(self.target) {
1075 cfg.compiler(builder.cc(self.target));
1076 cfg.cargo_metadata(false)
1078 .target(&self.target.triple)
1079 .host(&builder.config.build.triple)
1086 // Those flags are defined in src/llvm-project/compiler-rt/lib/crt/CMakeLists.txt
1087 // Currently only consumer of those objects is musl, which use .init_array/.fini_array
1088 // instead of .ctors/.dtors
1089 cfg.flag("-std=c11")
1090 .define("CRT_HAS_INITFINI_ARRAY", None)
1091 .define("EH_USE_FRAME_REGISTRY", None);
1095 t!(fs::copy(out_dir.join("crtbegin.o"), out_dir.join("crtbeginS.o")));
1096 t!(fs::copy(out_dir.join("crtend.o"), out_dir.join("crtendS.o")));
1101 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1102 pub struct Libunwind {
1103 pub target: TargetSelection,
1106 impl Step for Libunwind {
1107 type Output = PathBuf;
1109 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1110 run.path("src/llvm-project/libunwind")
1113 fn make_run(run: RunConfig<'_>) {
1114 run.builder.ensure(Libunwind { target: run.target });
1117 /// Build linunwind.a
1118 fn run(self, builder: &Builder<'_>) -> Self::Output {
1119 if builder.config.dry_run {
1120 return PathBuf::new();
1123 let out_dir = builder.native_dir(self.target).join("libunwind");
1124 let root = builder.src.join("src/llvm-project/libunwind");
1126 if up_to_date(&root, &out_dir.join("libunwind.a")) {
1130 builder.info(&format!("Building libunwind.a for {}", self.target.triple));
1131 t!(fs::create_dir_all(&out_dir));
1133 let mut cc_cfg = cc::Build::new();
1134 let mut cpp_cfg = cc::Build::new();
1137 cpp_cfg.cpp_set_stdlib(None);
1138 cpp_cfg.flag("-nostdinc++");
1139 cpp_cfg.flag("-fno-exceptions");
1140 cpp_cfg.flag("-fno-rtti");
1141 cpp_cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
1143 for cfg in [&mut cc_cfg, &mut cpp_cfg].iter_mut() {
1144 if let Some(ar) = builder.ar(self.target) {
1147 cfg.target(&self.target.triple);
1148 cfg.host(&builder.config.build.triple);
1149 cfg.warnings(false);
1151 // get_compiler() need set opt_level first.
1153 cfg.flag("-fstrict-aliasing");
1154 cfg.flag("-funwind-tables");
1155 cfg.flag("-fvisibility=hidden");
1156 cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
1157 cfg.include(root.join("include"));
1158 cfg.cargo_metadata(false);
1159 cfg.out_dir(&out_dir);
1161 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1162 cfg.static_flag(true);
1163 cfg.flag("-fno-stack-protector");
1164 cfg.flag("-ffreestanding");
1165 cfg.flag("-fexceptions");
1167 // easiest way to undefine since no API available in cc::Build to undefine
1168 cfg.flag("-U_FORTIFY_SOURCE");
1169 cfg.define("_FORTIFY_SOURCE", "0");
1170 cfg.define("RUST_SGX", "1");
1171 cfg.define("__NO_STRING_INLINES", None);
1172 cfg.define("__NO_MATH_INLINES", None);
1173 cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
1174 cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
1175 cfg.define("NDEBUG", None);
1177 if self.target.contains("windows") {
1178 cfg.define("_LIBUNWIND_HIDE_SYMBOLS", "1");
1179 cfg.define("_LIBUNWIND_IS_NATIVE_ONLY", "1");
1183 cc_cfg.compiler(builder.cc(self.target));
1184 if let Ok(cxx) = builder.cxx(self.target) {
1185 cpp_cfg.compiler(cxx);
1187 cc_cfg.compiler(builder.cc(self.target));
1190 // Don't set this for clang
1191 // By default, Clang builds C code in GNU C17 mode.
1192 // By default, Clang builds C++ code according to the C++98 standard,
1193 // with many C++11 features accepted as extensions.
1194 if cc_cfg.get_compiler().is_like_gnu() {
1195 cc_cfg.flag("-std=c99");
1197 if cpp_cfg.get_compiler().is_like_gnu() {
1198 cpp_cfg.flag("-std=c++11");
1201 if self.target.contains("x86_64-fortanix-unknown-sgx") || self.target.contains("musl") {
1202 // use the same GCC C compiler command to compile C++ code so we do not need to setup the
1203 // C++ compiler env variables on the builders.
1204 // Don't set this for clang++, as clang++ is able to compile this without libc++.
1205 if cpp_cfg.get_compiler().is_like_gnu() {
1207 cpp_cfg.compiler(builder.cc(self.target));
1211 let mut c_sources = vec![
1213 "UnwindLevel1-gcc-ext.c",
1215 "UnwindRegistersRestore.S",
1216 "UnwindRegistersSave.S",
1219 let cpp_sources = vec!["Unwind-EHABI.cpp", "Unwind-seh.cpp", "libunwind.cpp"];
1220 let cpp_len = cpp_sources.len();
1222 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1223 c_sources.push("UnwindRustSgx.c");
1226 for src in c_sources {
1227 cc_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1230 for src in &cpp_sources {
1231 cpp_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1234 cpp_cfg.compile("unwind-cpp");
1236 // FIXME: https://github.com/alexcrichton/cc-rs/issues/545#issuecomment-679242845
1238 for entry in fs::read_dir(&out_dir).unwrap() {
1239 let file = entry.unwrap().path().canonicalize().unwrap();
1240 if file.is_file() && file.extension() == Some(OsStr::new("o")) {
1241 // file name starts with "Unwind-EHABI", "Unwind-seh" or "libunwind"
1242 let file_name = file.file_name().unwrap().to_str().expect("UTF-8 file name");
1243 if cpp_sources.iter().any(|f| file_name.starts_with(&f[..f.len() - 4])) {
1244 cc_cfg.object(&file);
1249 assert_eq!(cpp_len, count, "Can't get object files from {:?}", &out_dir);
1251 cc_cfg.compile("unwind");