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
184 help: old builds get deleted after a certain time
185 help: if trying to compile an old commit of rustc, disable `download-ci-llvm` in config.toml:
188 download-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 if let Ok(llvm_profile_dir) = std::env::var("LLVM_PROFILE_DIR") {
304 cfg.define("LLVM_PROFILE_DATA_DIR", llvm_profile_dir);
306 cfg.define("LLVM_BUILD_RUNTIME", "No");
308 if let Some(path) = builder.config.llvm_profile_use.as_ref() {
309 cfg.define("LLVM_PROFDATA_FILE", &path);
312 if target != "aarch64-apple-darwin" && !target.contains("windows") {
313 cfg.define("LLVM_ENABLE_ZLIB", "ON");
315 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
318 // Are we compiling for iOS/tvOS/watchOS?
319 if target.contains("apple-ios")
320 || target.contains("apple-tvos")
321 || target.contains("apple-watchos")
323 // These two defines prevent CMake from automatically trying to add a MacOSX sysroot, which leads to a compiler error.
324 cfg.define("CMAKE_OSX_SYSROOT", "/");
325 cfg.define("CMAKE_OSX_DEPLOYMENT_TARGET", "");
326 // Prevent cmake from adding -bundle to CFLAGS automatically, which leads to a compiler error because "-bitcode_bundle" also gets added.
327 cfg.define("LLVM_ENABLE_PLUGINS", "OFF");
328 // Zlib fails to link properly, leading to a compiler error.
329 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
332 if builder.config.llvm_thin_lto {
333 cfg.define("LLVM_ENABLE_LTO", "Thin");
334 if !target.contains("apple") {
335 cfg.define("LLVM_ENABLE_LLD", "ON");
339 // This setting makes the LLVM tools link to the dynamic LLVM library,
340 // which saves both memory during parallel links and overall disk space
341 // for the tools. We don't do this on every platform as it doesn't work
342 // equally well everywhere.
344 // If we're not linking rustc to a dynamic LLVM, though, then don't link
346 if builder.llvm_link_tools_dynamically(target) && builder.llvm_link_shared() {
347 cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
350 if target.starts_with("riscv") && !target.contains("freebsd") {
351 // RISC-V GCC erroneously requires linking against
352 // `libatomic` when using 1-byte and 2-byte C++
353 // atomics but the LLVM build system check cannot
354 // detect this. Therefore it is set manually here.
355 // FreeBSD uses Clang as its system compiler and
356 // provides no libatomic in its base system so does
358 ldflags.exe.push(" -latomic");
359 ldflags.shared.push(" -latomic");
362 if target.contains("msvc") {
363 cfg.define("LLVM_USE_CRT_DEBUG", "MT");
364 cfg.define("LLVM_USE_CRT_RELEASE", "MT");
365 cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
366 cfg.static_crt(true);
369 if target.starts_with("i686") {
370 cfg.define("LLVM_BUILD_32_BITS", "ON");
373 let mut enabled_llvm_projects = Vec::new();
375 if util::forcing_clang_based_tests() {
376 enabled_llvm_projects.push("clang");
377 enabled_llvm_projects.push("compiler-rt");
380 if builder.config.llvm_polly {
381 enabled_llvm_projects.push("polly");
384 if builder.config.llvm_clang {
385 enabled_llvm_projects.push("clang");
388 // We want libxml to be disabled.
389 // See https://github.com/rust-lang/rust/pull/50104
390 cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
392 if !enabled_llvm_projects.is_empty() {
393 enabled_llvm_projects.sort();
394 enabled_llvm_projects.dedup();
395 cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
398 if let Some(num_linkers) = builder.config.llvm_link_jobs {
400 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
404 // Workaround for ppc32 lld limitation
405 if target == "powerpc-unknown-freebsd" {
406 ldflags.exe.push(" -fuse-ld=bfd");
409 // https://llvm.org/docs/HowToCrossCompileLLVM.html
410 if target != builder.config.build {
411 builder.ensure(Llvm { target: builder.config.build });
412 // FIXME: if the llvm root for the build triple is overridden then we
413 // should use llvm-tblgen from there, also should verify that it
414 // actually exists most of the time in normal installs of LLVM.
415 let host_bin = builder.llvm_out(builder.config.build).join("bin");
416 cfg.define("CMAKE_CROSSCOMPILING", "True");
417 cfg.define("LLVM_TABLEGEN", host_bin.join("llvm-tblgen").with_extension(EXE_EXTENSION));
418 cfg.define("LLVM_NM", host_bin.join("llvm-nm").with_extension(EXE_EXTENSION));
421 host_bin.join("llvm-config").with_extension(EXE_EXTENSION),
425 if let Some(ref suffix) = builder.config.llvm_version_suffix {
426 // Allow version-suffix="" to not define a version suffix at all.
427 if !suffix.is_empty() {
428 cfg.define("LLVM_VERSION_SUFFIX", suffix);
430 } else if builder.config.channel == "dev" {
431 // Changes to a version suffix require a complete rebuild of the LLVM.
432 // To avoid rebuilds during a time of version bump, don't include rustc
433 // release number on the dev channel.
434 cfg.define("LLVM_VERSION_SUFFIX", "-rust-dev");
436 let suffix = format!("-rust-{}-{}", builder.version, builder.config.channel);
437 cfg.define("LLVM_VERSION_SUFFIX", suffix);
440 if let Some(ref linker) = builder.config.llvm_use_linker {
441 cfg.define("LLVM_USE_LINKER", linker);
444 if builder.config.llvm_allow_old_toolchain {
445 cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
448 configure_cmake(builder, target, &mut cfg, true, ldflags);
450 for (key, val) in &builder.config.llvm_build_config {
451 cfg.define(key, val);
454 // FIXME: we don't actually need to build all LLVM tools and all LLVM
455 // libraries here, e.g., we just want a few components and a few
456 // tools. Figure out how to filter them down and only build the right
457 // tools and libs on all platforms.
459 if builder.config.dry_run {
460 return build_llvm_config;
471 fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
472 if !builder.config.llvm_version_check {
476 if builder.config.dry_run {
480 let mut cmd = Command::new(llvm_config);
481 let version = output(cmd.arg("--version"));
482 let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
483 if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
488 panic!("\n\nbad LLVM version: {}, need >=12.0\n\n", version)
492 builder: &Builder<'_>,
493 target: TargetSelection,
494 cfg: &mut cmake::Config,
495 use_compiler_launcher: bool,
496 mut ldflags: LdFlags,
498 // Do not print installation messages for up-to-date files.
499 // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
500 cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
502 // Do not allow the user's value of DESTDIR to influence where
503 // LLVM will install itself. LLVM must always be installed in our
504 // own build directories.
505 cfg.env("DESTDIR", "");
508 cfg.generator("Ninja");
510 cfg.target(&target.triple).host(&builder.config.build.triple);
512 if target != builder.config.build {
513 if target.contains("netbsd") {
514 cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
515 } else if target.contains("freebsd") {
516 cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
517 } else if target.contains("windows") {
518 cfg.define("CMAKE_SYSTEM_NAME", "Windows");
519 } else if target.contains("haiku") {
520 cfg.define("CMAKE_SYSTEM_NAME", "Haiku");
521 } else if target.contains("solaris") || target.contains("illumos") {
522 cfg.define("CMAKE_SYSTEM_NAME", "SunOS");
524 // When cross-compiling we should also set CMAKE_SYSTEM_VERSION, but in
525 // that case like CMake we cannot easily determine system version either.
527 // Since, the LLVM itself makes rather limited use of version checks in
528 // CMakeFiles (and then only in tests), and so far no issues have been
529 // reported, the system version is currently left unset.
532 let sanitize_cc = |cc: &Path| {
533 if target.contains("msvc") {
534 OsString::from(cc.to_str().unwrap().replace("\\", "/"))
536 cc.as_os_str().to_owned()
540 // MSVC with CMake uses msbuild by default which doesn't respect these
541 // vars that we'd otherwise configure. In that case we just skip this
543 if target.contains("msvc") && !builder.ninja() {
547 let (cc, cxx) = match builder.config.llvm_clang_cl {
548 Some(ref cl) => (cl.as_ref(), cl.as_ref()),
549 None => (builder.cc(target), builder.cxx(target).unwrap()),
552 // Handle msvc + ninja + ccache specially (this is what the bots use)
553 if target.contains("msvc") && builder.ninja() && builder.config.ccache.is_some() {
554 let mut wrap_cc = env::current_exe().expect("failed to get cwd");
555 wrap_cc.set_file_name("sccache-plus-cl.exe");
557 cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
558 .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
559 cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
560 .env("SCCACHE_TARGET", target.triple)
561 .env("SCCACHE_CC", &cc)
562 .env("SCCACHE_CXX", &cxx);
564 // Building LLVM on MSVC can be a little ludicrous at times. We're so far
565 // off the beaten path here that I'm not really sure this is even half
566 // supported any more. Here we're trying to:
568 // * Build LLVM on MSVC
569 // * Build LLVM with `clang-cl` instead of `cl.exe`
570 // * Build a project with `sccache`
571 // * Build for 32-bit as well
572 // * Build with Ninja
574 // For `cl.exe` there are different binaries to compile 32/64 bit which
575 // we use but for `clang-cl` there's only one which internally
576 // multiplexes via flags. As a result it appears that CMake's detection
577 // of a compiler's architecture and such on MSVC **doesn't** pass any
578 // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
579 // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
580 // definitely causes problems since all the env vars are pointing to
583 // To hack around this... again... we pass an argument that's
584 // unconditionally passed in the sccache shim. This'll get CMake to
585 // correctly diagnose it's doing a 32-bit compilation and LLVM will
586 // internally configure itself appropriately.
587 if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
588 cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
591 // If ccache is configured we inform the build a little differently how
592 // to invoke ccache while also invoking our compilers.
593 if use_compiler_launcher {
594 if let Some(ref ccache) = builder.config.ccache {
595 cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
596 .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
599 cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
600 .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx))
601 .define("CMAKE_ASM_COMPILER", sanitize_cc(cc));
604 cfg.build_arg("-j").build_arg(builder.jobs().to_string());
605 let mut cflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::C).join(" ").into();
606 if let Some(ref s) = builder.config.llvm_cflags {
610 // Some compiler features used by LLVM (such as thread locals) will not work on a min version below iOS 10.
611 if target.contains("apple-ios") {
612 if target.contains("86-") {
613 cflags.push(" -miphonesimulator-version-min=10.0");
615 cflags.push(" -miphoneos-version-min=10.0");
618 if builder.config.llvm_clang_cl.is_some() {
619 cflags.push(&format!(" --target={}", target));
621 cfg.define("CMAKE_C_FLAGS", cflags);
622 let mut cxxflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::Cxx).join(" ").into();
623 if let Some(ref s) = builder.config.llvm_cxxflags {
627 if builder.config.llvm_clang_cl.is_some() {
628 cxxflags.push(&format!(" --target={}", target));
630 cfg.define("CMAKE_CXX_FLAGS", cxxflags);
631 if let Some(ar) = builder.ar(target) {
632 if ar.is_absolute() {
633 // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
634 // tries to resolve this path in the LLVM build directory.
635 cfg.define("CMAKE_AR", sanitize_cc(ar));
639 if let Some(ranlib) = builder.ranlib(target) {
640 if ranlib.is_absolute() {
641 // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
642 // tries to resolve this path in the LLVM build directory.
643 cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
647 if let Some(ref flags) = builder.config.llvm_ldflags {
648 ldflags.push_all(flags);
651 if let Some(flags) = get_var("LDFLAGS", &builder.config.build.triple, &target.triple) {
652 ldflags.push_all(&flags);
655 // For distribution we want the LLVM tools to be *statically* linked to libstdc++.
656 // We also do this if the user explicitly requested static libstdc++.
657 if builder.config.llvm_static_stdcpp {
658 if !target.contains("msvc") && !target.contains("netbsd") {
659 if target.contains("apple") || target.contains("windows") {
660 ldflags.push_all("-static-libstdc++");
662 ldflags.push_all("-Wl,-Bsymbolic -static-libstdc++");
667 cfg.define("CMAKE_SHARED_LINKER_FLAGS", &ldflags.shared);
668 cfg.define("CMAKE_MODULE_LINKER_FLAGS", &ldflags.module);
669 cfg.define("CMAKE_EXE_LINKER_FLAGS", &ldflags.exe);
671 if env::var_os("SCCACHE_ERROR_LOG").is_some() {
672 cfg.env("RUSTC_LOG", "sccache=warn");
676 // Adapted from https://github.com/alexcrichton/cc-rs/blob/fba7feded71ee4f63cfe885673ead6d7b4f2f454/src/lib.rs#L2347-L2365
677 fn get_var(var_base: &str, host: &str, target: &str) -> Option<OsString> {
678 let kind = if host == target { "HOST" } else { "TARGET" };
679 let target_u = target.replace("-", "_");
680 env::var_os(&format!("{}_{}", var_base, target))
681 .or_else(|| env::var_os(&format!("{}_{}", var_base, target_u)))
682 .or_else(|| env::var_os(&format!("{}_{}", kind, var_base)))
683 .or_else(|| env::var_os(var_base))
686 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
688 pub target: TargetSelection,
692 type Output = PathBuf;
693 const ONLY_HOSTS: bool = true;
695 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
696 run.path("src/llvm-project/lld")
699 fn make_run(run: RunConfig<'_>) {
700 run.builder.ensure(Lld { target: run.target });
703 /// Compile LLD for `target`.
704 fn run(self, builder: &Builder<'_>) -> PathBuf {
705 if builder.config.dry_run {
706 return PathBuf::from("lld-out-dir-test-gen");
708 let target = self.target;
710 let llvm_config = builder.ensure(Llvm { target: self.target });
712 let out_dir = builder.lld_out(target);
713 let done_stamp = out_dir.join("lld-finished-building");
714 if done_stamp.exists() {
718 builder.info(&format!("Building LLD for {}", target));
719 let _time = util::timeit(&builder);
720 t!(fs::create_dir_all(&out_dir));
722 let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
723 configure_cmake(builder, target, &mut cfg, true, LdFlags::default());
725 // This is an awful, awful hack. Discovered when we migrated to using
726 // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
727 // tree, will execute `llvm-config --cmakedir` and then tell CMake about
728 // that directory for later processing. Unfortunately if this path has
729 // forward slashes in it (which it basically always does on Windows)
730 // then CMake will hit a syntax error later on as... something isn't
733 // Instead of attempting to fix this problem in upstream CMake and/or
734 // LLVM/LLD we just hack around it here. This thin wrapper will take the
735 // output from llvm-config and replace all instances of `\` with `/` to
736 // ensure we don't hit the same bugs with escaping. It means that you
737 // can't build on a system where your paths require `\` on Windows, but
738 // there's probably a lot of reasons you can't do that other than this.
739 let llvm_config_shim = env::current_exe().unwrap().with_file_name("llvm-config-wrapper");
741 // Re-use the same flags as llvm to control the level of debug information
742 // generated for lld.
743 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
744 (false, _) => "Debug",
745 (true, false) => "Release",
746 (true, true) => "RelWithDebInfo",
749 cfg.out_dir(&out_dir)
751 .env("LLVM_CONFIG_REAL", &llvm_config)
752 .define("LLVM_CONFIG_PATH", llvm_config_shim)
753 .define("LLVM_INCLUDE_TESTS", "OFF");
755 if builder.config.llvm_allow_old_toolchain {
756 cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
759 // While we're using this horrible workaround to shim the execution of
760 // llvm-config, let's just pile on more. I can't seem to figure out how
761 // to build LLD as a standalone project and also cross-compile it at the
762 // same time. It wants a natively executable `llvm-config` to learn
763 // about LLVM, but then it learns about all the host configuration of
764 // LLVM and tries to link to host LLVM libraries.
766 // To work around that we tell our shim to replace anything with the
767 // build target with the actual target instead. This'll break parts of
768 // LLD though which try to execute host tools, such as llvm-tblgen, so
769 // we specifically tell it where to find those. This is likely super
770 // brittle and will break over time. If anyone knows better how to
771 // cross-compile LLD it would be much appreciated to fix this!
772 if target != builder.config.build {
773 cfg.env("LLVM_CONFIG_SHIM_REPLACE", &builder.config.build.triple)
774 .env("LLVM_CONFIG_SHIM_REPLACE_WITH", &target.triple)
777 llvm_config.with_file_name("llvm-tblgen").with_extension(EXE_EXTENSION),
781 // Explicitly set C++ standard, because upstream doesn't do so
782 // for standalone builds.
783 cfg.define("CMAKE_CXX_STANDARD", "14");
787 t!(File::create(&done_stamp));
792 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
793 pub struct TestHelpers {
794 pub target: TargetSelection,
797 impl Step for TestHelpers {
800 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
801 run.path("src/test/auxiliary/rust_test_helpers.c")
804 fn make_run(run: RunConfig<'_>) {
805 run.builder.ensure(TestHelpers { target: run.target })
808 /// Compiles the `rust_test_helpers.c` library which we used in various
809 /// `run-pass` tests for ABI testing.
810 fn run(self, builder: &Builder<'_>) {
811 if builder.config.dry_run {
814 // The x86_64-fortanix-unknown-sgx target doesn't have a working C
815 // toolchain. However, some x86_64 ELF objects can be linked
816 // without issues. Use this hack to compile the test helpers.
817 let target = if self.target == "x86_64-fortanix-unknown-sgx" {
818 TargetSelection::from_user("x86_64-unknown-linux-gnu")
822 let dst = builder.test_helpers_out(target);
823 let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
824 if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
828 builder.info("Building test helpers");
829 t!(fs::create_dir_all(&dst));
830 let mut cfg = cc::Build::new();
831 // FIXME: Workaround for https://github.com/emscripten-core/emscripten/issues/9013
832 if target.contains("emscripten") {
836 // We may have found various cross-compilers a little differently due to our
837 // extra configuration, so inform cc of these compilers. Note, though, that
838 // on MSVC we still need cc's detection of env vars (ugh).
839 if !target.contains("msvc") {
840 if let Some(ar) = builder.ar(target) {
843 cfg.compiler(builder.cc(target));
845 cfg.cargo_metadata(false)
847 .target(&target.triple)
848 .host(&builder.config.build.triple)
852 .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
853 .compile("rust_test_helpers");
857 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
858 pub struct Sanitizers {
859 pub target: TargetSelection,
862 impl Step for Sanitizers {
863 type Output = Vec<SanitizerRuntime>;
865 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
866 run.alias("sanitizers")
869 fn make_run(run: RunConfig<'_>) {
870 run.builder.ensure(Sanitizers { target: run.target });
873 /// Builds sanitizer runtime libraries.
874 fn run(self, builder: &Builder<'_>) -> Self::Output {
875 let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
876 if !compiler_rt_dir.exists() {
880 let out_dir = builder.native_dir(self.target).join("sanitizers");
881 let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
882 if runtimes.is_empty() {
886 let llvm_config = builder.ensure(Llvm { target: builder.config.build });
887 if builder.config.dry_run {
891 let stamp = out_dir.join("sanitizers-finished-building");
892 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
895 if stamp.hash.is_none() {
896 builder.info(&format!(
897 "Rebuild sanitizers by removing the file `{}`",
904 builder.info(&format!("Building sanitizers for {}", self.target));
906 let _time = util::timeit(&builder);
908 let mut cfg = cmake::Config::new(&compiler_rt_dir);
909 cfg.profile("Release");
910 cfg.define("CMAKE_C_COMPILER_TARGET", self.target.triple);
911 cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
912 cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
913 cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
914 cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
915 cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
916 cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
917 cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
918 cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
919 cfg.define("LLVM_CONFIG_PATH", &llvm_config);
921 // On Darwin targets the sanitizer runtimes are build as universal binaries.
922 // Unfortunately sccache currently lacks support to build them successfully.
923 // Disable compiler launcher on Darwin targets to avoid potential issues.
924 let use_compiler_launcher = !self.target.contains("apple-darwin");
925 configure_cmake(builder, self.target, &mut cfg, use_compiler_launcher, LdFlags::default());
927 t!(fs::create_dir_all(&out_dir));
928 cfg.out_dir(out_dir);
930 for runtime in &runtimes {
931 cfg.build_target(&runtime.cmake_target);
940 #[derive(Clone, Debug)]
941 pub struct SanitizerRuntime {
942 /// CMake target used to build the runtime.
943 pub cmake_target: String,
944 /// Path to the built runtime library.
946 /// Library filename that will be used rustc.
950 /// Returns sanitizers available on a given target.
951 fn supported_sanitizers(
953 target: TargetSelection,
955 ) -> Vec<SanitizerRuntime> {
956 let darwin_libs = |os: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
959 .map(move |c| SanitizerRuntime {
960 cmake_target: format!("clang_rt.{}_{}_dynamic", c, os),
962 .join(&format!("build/lib/darwin/libclang_rt.{}_{}_dynamic.dylib", c, os)),
963 name: format!("librustc-{}_rt.{}.dylib", channel, c),
968 let common_libs = |os: &str, arch: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
971 .map(move |c| SanitizerRuntime {
972 cmake_target: format!("clang_rt.{}-{}", c, arch),
973 path: out_dir.join(&format!("build/lib/{}/libclang_rt.{}-{}.a", os, c, arch)),
974 name: format!("librustc-{}_rt.{}.a", channel, c),
979 match &*target.triple {
980 "aarch64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
981 "aarch64-fuchsia" => common_libs("fuchsia", "aarch64", &["asan"]),
982 "aarch64-unknown-linux-gnu" => {
983 common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan", "hwasan"])
985 "x86_64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
986 "x86_64-fuchsia" => common_libs("fuchsia", "x86_64", &["asan"]),
987 "x86_64-unknown-freebsd" => common_libs("freebsd", "x86_64", &["asan", "msan", "tsan"]),
988 "x86_64-unknown-netbsd" => {
989 common_libs("netbsd", "x86_64", &["asan", "lsan", "msan", "tsan"])
991 "x86_64-unknown-illumos" => common_libs("illumos", "x86_64", &["asan"]),
992 "x86_64-pc-solaris" => common_libs("solaris", "x86_64", &["asan"]),
993 "x86_64-unknown-linux-gnu" => {
994 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
996 "x86_64-unknown-linux-musl" => {
997 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
1005 hash: Option<Vec<u8>>,
1009 fn new(path: PathBuf, hash: Option<&str>) -> Self {
1010 HashStamp { path, hash: hash.map(|s| s.as_bytes().to_owned()) }
1013 fn is_done(&self) -> bool {
1014 match fs::read(&self.path) {
1015 Ok(h) => self.hash.as_deref().unwrap_or(b"") == h.as_slice(),
1016 Err(e) if e.kind() == io::ErrorKind::NotFound => false,
1018 panic!("failed to read stamp file `{}`: {}", self.path.display(), e);
1023 fn remove(&self) -> io::Result<()> {
1024 match fs::remove_file(&self.path) {
1027 if e.kind() == io::ErrorKind::NotFound {
1036 fn write(&self) -> io::Result<()> {
1037 fs::write(&self.path, self.hash.as_deref().unwrap_or(b""))
1041 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1042 pub struct CrtBeginEnd {
1043 pub target: TargetSelection,
1046 impl Step for CrtBeginEnd {
1047 type Output = PathBuf;
1049 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1050 run.path("src/llvm-project/compiler-rt/lib/crt")
1053 fn make_run(run: RunConfig<'_>) {
1054 run.builder.ensure(CrtBeginEnd { target: run.target });
1057 /// Build crtbegin.o/crtend.o for musl target.
1058 fn run(self, builder: &Builder<'_>) -> Self::Output {
1059 let out_dir = builder.native_dir(self.target).join("crt");
1061 if builder.config.dry_run {
1065 let crtbegin_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtbegin.c");
1066 let crtend_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtend.c");
1067 if up_to_date(&crtbegin_src, &out_dir.join("crtbegin.o"))
1068 && up_to_date(&crtend_src, &out_dir.join("crtendS.o"))
1073 builder.info("Building crtbegin.o and crtend.o");
1074 t!(fs::create_dir_all(&out_dir));
1076 let mut cfg = cc::Build::new();
1078 if let Some(ar) = builder.ar(self.target) {
1081 cfg.compiler(builder.cc(self.target));
1082 cfg.cargo_metadata(false)
1084 .target(&self.target.triple)
1085 .host(&builder.config.build.triple)
1092 // Those flags are defined in src/llvm-project/compiler-rt/lib/crt/CMakeLists.txt
1093 // Currently only consumer of those objects is musl, which use .init_array/.fini_array
1094 // instead of .ctors/.dtors
1095 cfg.flag("-std=c11")
1096 .define("CRT_HAS_INITFINI_ARRAY", None)
1097 .define("EH_USE_FRAME_REGISTRY", None);
1101 t!(fs::copy(out_dir.join("crtbegin.o"), out_dir.join("crtbeginS.o")));
1102 t!(fs::copy(out_dir.join("crtend.o"), out_dir.join("crtendS.o")));
1107 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1108 pub struct Libunwind {
1109 pub target: TargetSelection,
1112 impl Step for Libunwind {
1113 type Output = PathBuf;
1115 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1116 run.path("src/llvm-project/libunwind")
1119 fn make_run(run: RunConfig<'_>) {
1120 run.builder.ensure(Libunwind { target: run.target });
1123 /// Build linunwind.a
1124 fn run(self, builder: &Builder<'_>) -> Self::Output {
1125 if builder.config.dry_run {
1126 return PathBuf::new();
1129 let out_dir = builder.native_dir(self.target).join("libunwind");
1130 let root = builder.src.join("src/llvm-project/libunwind");
1132 if up_to_date(&root, &out_dir.join("libunwind.a")) {
1136 builder.info(&format!("Building libunwind.a for {}", self.target.triple));
1137 t!(fs::create_dir_all(&out_dir));
1139 let mut cc_cfg = cc::Build::new();
1140 let mut cpp_cfg = cc::Build::new();
1143 cpp_cfg.cpp_set_stdlib(None);
1144 cpp_cfg.flag("-nostdinc++");
1145 cpp_cfg.flag("-fno-exceptions");
1146 cpp_cfg.flag("-fno-rtti");
1147 cpp_cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
1149 for cfg in [&mut cc_cfg, &mut cpp_cfg].iter_mut() {
1150 if let Some(ar) = builder.ar(self.target) {
1153 cfg.target(&self.target.triple);
1154 cfg.host(&builder.config.build.triple);
1155 cfg.warnings(false);
1157 // get_compiler() need set opt_level first.
1159 cfg.flag("-fstrict-aliasing");
1160 cfg.flag("-funwind-tables");
1161 cfg.flag("-fvisibility=hidden");
1162 cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
1163 cfg.include(root.join("include"));
1164 cfg.cargo_metadata(false);
1165 cfg.out_dir(&out_dir);
1167 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1168 cfg.static_flag(true);
1169 cfg.flag("-fno-stack-protector");
1170 cfg.flag("-ffreestanding");
1171 cfg.flag("-fexceptions");
1173 // easiest way to undefine since no API available in cc::Build to undefine
1174 cfg.flag("-U_FORTIFY_SOURCE");
1175 cfg.define("_FORTIFY_SOURCE", "0");
1176 cfg.define("RUST_SGX", "1");
1177 cfg.define("__NO_STRING_INLINES", None);
1178 cfg.define("__NO_MATH_INLINES", None);
1179 cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
1180 cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
1181 cfg.define("NDEBUG", None);
1183 if self.target.contains("windows") {
1184 cfg.define("_LIBUNWIND_HIDE_SYMBOLS", "1");
1185 cfg.define("_LIBUNWIND_IS_NATIVE_ONLY", "1");
1189 cc_cfg.compiler(builder.cc(self.target));
1190 if let Ok(cxx) = builder.cxx(self.target) {
1191 cpp_cfg.compiler(cxx);
1193 cc_cfg.compiler(builder.cc(self.target));
1196 // Don't set this for clang
1197 // By default, Clang builds C code in GNU C17 mode.
1198 // By default, Clang builds C++ code according to the C++98 standard,
1199 // with many C++11 features accepted as extensions.
1200 if cc_cfg.get_compiler().is_like_gnu() {
1201 cc_cfg.flag("-std=c99");
1203 if cpp_cfg.get_compiler().is_like_gnu() {
1204 cpp_cfg.flag("-std=c++11");
1207 if self.target.contains("x86_64-fortanix-unknown-sgx") || self.target.contains("musl") {
1208 // use the same GCC C compiler command to compile C++ code so we do not need to setup the
1209 // C++ compiler env variables on the builders.
1210 // Don't set this for clang++, as clang++ is able to compile this without libc++.
1211 if cpp_cfg.get_compiler().is_like_gnu() {
1213 cpp_cfg.compiler(builder.cc(self.target));
1217 let mut c_sources = vec![
1219 "UnwindLevel1-gcc-ext.c",
1221 "UnwindRegistersRestore.S",
1222 "UnwindRegistersSave.S",
1225 let cpp_sources = vec!["Unwind-EHABI.cpp", "Unwind-seh.cpp", "libunwind.cpp"];
1226 let cpp_len = cpp_sources.len();
1228 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1229 c_sources.push("UnwindRustSgx.c");
1232 for src in c_sources {
1233 cc_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1236 for src in &cpp_sources {
1237 cpp_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1240 cpp_cfg.compile("unwind-cpp");
1242 // FIXME: https://github.com/alexcrichton/cc-rs/issues/545#issuecomment-679242845
1244 for entry in fs::read_dir(&out_dir).unwrap() {
1245 let file = entry.unwrap().path().canonicalize().unwrap();
1246 if file.is_file() && file.extension() == Some(OsStr::new("o")) {
1247 // file name starts with "Unwind-EHABI", "Unwind-seh" or "libunwind"
1248 let file_name = file.file_name().unwrap().to_str().expect("UTF-8 file name");
1249 if cpp_sources.iter().any(|f| file_name.starts_with(&f[..f.len() - 4])) {
1250 cc_cfg.object(&file);
1255 assert_eq!(cpp_len, count, "Can't get object files from {:?}", &out_dir);
1257 cc_cfg.compile("unwind");