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::get_clang_cl_resource_dir;
22 use crate::util::{self, exe, output, program_out_of_date, t, up_to_date};
23 use crate::{CLang, GitRepo};
27 build_llvm_config: PathBuf,
32 // Linker flags to pass to LLVM's CMake invocation.
33 #[derive(Debug, Clone, Default)]
35 // CMAKE_EXE_LINKER_FLAGS
37 // CMAKE_SHARED_LINKER_FLAGS
39 // CMAKE_MODULE_LINKER_FLAGS
44 fn push_all(&mut self, s: impl AsRef<OsStr>) {
48 self.shared.push(" ");
50 self.module.push(" ");
55 // This returns whether we've already previously built LLVM.
57 // It's used to avoid busting caches during x.py check -- if we've already built
58 // LLVM, it's fine for us to not try to avoid doing so.
60 // This will return the llvm-config if it can get it (but it will not build it
62 pub fn prebuilt_llvm_config(
63 builder: &Builder<'_>,
64 target: TargetSelection,
65 ) -> Result<PathBuf, Meta> {
66 maybe_download_ci_llvm(builder);
68 // If we're using a custom LLVM bail out here, but we can only use a
69 // custom LLVM for the build triple.
70 if let Some(config) = builder.config.target_config.get(&target) {
71 if let Some(ref s) = config.llvm_config {
72 check_llvm_version(builder, s);
73 return Ok(s.to_path_buf());
77 let root = "src/llvm-project/llvm";
78 let out_dir = builder.llvm_out(target);
80 let mut llvm_config_ret_dir = builder.llvm_out(builder.config.build);
81 if !builder.config.build.contains("msvc") || builder.ninja() {
82 llvm_config_ret_dir.push("build");
84 llvm_config_ret_dir.push("bin");
86 let build_llvm_config = llvm_config_ret_dir.join(exe("llvm-config", builder.config.build));
88 let stamp = out_dir.join("llvm-finished-building");
89 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
91 if builder.config.llvm_skip_rebuild && stamp.path.exists() {
94 Using a potentially stale build of LLVM; \
95 This may not behave well.",
97 return Ok(build_llvm_config);
101 if stamp.hash.is_none() {
103 "Could not determine the LLVM submodule commit hash. \
104 Assuming that an LLVM rebuild is not necessary.",
106 builder.info(&format!(
107 "To force LLVM to rebuild, remove the file `{}`",
111 return Ok(build_llvm_config);
114 Err(Meta { stamp, build_llvm_config, out_dir, root: root.into() })
117 /// This retrieves the LLVM sha we *want* to use, according to git history.
118 pub(crate) fn detect_llvm_sha(config: &crate::config::Config) -> String {
119 let mut rev_list = config.git();
121 PathBuf::from("rev-list"),
122 format!("--author={}", config.stage0_metadata.config.git_merge_commit_email).into(),
124 "--first-parent".into(),
127 config.src.join("src/llvm-project"),
128 config.src.join("src/bootstrap/download-ci-llvm-stamp"),
129 // the LLVM shared object file is named `LLVM-12-rust-{version}-nightly`
130 config.src.join("src/version"),
132 let llvm_sha = output(&mut rev_list);
133 let llvm_sha = llvm_sha.trim();
136 eprintln!("error: could not find commit hash for downloading LLVM");
137 eprintln!("help: maybe your repository history is too shallow?");
138 eprintln!("help: consider disabling `download-ci-llvm`");
139 eprintln!("help: or fetch enough history to include one upstream commit");
146 /// Returns whether the CI-found LLVM is currently usable.
148 /// This checks both the build triple platform to confirm we're usable at all,
149 /// and then verifies if the current HEAD matches the detected LLVM SHA head,
150 /// in which case LLVM is indicated as not available.
151 pub(crate) fn is_ci_llvm_available(config: &crate::config::Config, asserts: bool) -> bool {
152 // This is currently all tier 1 targets and tier 2 targets with host tools
153 // (since others may not have CI artifacts)
154 // https://doc.rust-lang.org/rustc/platform-support.html#tier-1
155 let supported_platforms = [
157 "aarch64-unknown-linux-gnu",
158 "i686-pc-windows-gnu",
159 "i686-pc-windows-msvc",
160 "i686-unknown-linux-gnu",
161 "x86_64-unknown-linux-gnu",
162 "x86_64-apple-darwin",
163 "x86_64-pc-windows-gnu",
164 "x86_64-pc-windows-msvc",
165 // tier 2 with host tools
166 "aarch64-apple-darwin",
167 "aarch64-pc-windows-msvc",
168 "aarch64-unknown-linux-musl",
169 "arm-unknown-linux-gnueabi",
170 "arm-unknown-linux-gnueabihf",
171 "armv7-unknown-linux-gnueabihf",
172 "mips-unknown-linux-gnu",
173 "mips64-unknown-linux-gnuabi64",
174 "mips64el-unknown-linux-gnuabi64",
175 "mipsel-unknown-linux-gnu",
176 "powerpc-unknown-linux-gnu",
177 "powerpc64-unknown-linux-gnu",
178 "powerpc64le-unknown-linux-gnu",
179 "riscv64gc-unknown-linux-gnu",
180 "s390x-unknown-linux-gnu",
181 "x86_64-unknown-freebsd",
182 "x86_64-unknown-illumos",
183 "x86_64-unknown-linux-musl",
184 "x86_64-unknown-netbsd",
186 if !supported_platforms.contains(&&*config.build.triple) {
190 let triple = &*config.build.triple;
191 if (triple == "aarch64-unknown-linux-gnu" || triple.contains("i686")) && asserts {
192 // No alt builder for aarch64-unknown-linux-gnu today.
196 if crate::util::CiEnv::is_ci() {
197 let llvm_sha = detect_llvm_sha(config);
198 let head_sha = output(config.git().arg("rev-parse").arg("HEAD"));
199 let head_sha = head_sha.trim();
200 if llvm_sha == head_sha {
202 "Detected LLVM as non-available: running in CI and modified LLVM in this change"
211 pub(crate) fn maybe_download_ci_llvm(builder: &Builder<'_>) {
212 let config = &builder.config;
213 if !config.llvm_from_ci {
216 let llvm_root = config.ci_llvm_root();
217 let llvm_stamp = llvm_root.join(".llvm-stamp");
218 let llvm_sha = detect_llvm_sha(&config);
219 let key = format!("{}{}", llvm_sha, config.llvm_assertions);
220 if program_out_of_date(&llvm_stamp, &key) && !config.dry_run {
221 download_ci_llvm(builder, &llvm_sha);
222 for entry in t!(fs::read_dir(llvm_root.join("bin"))) {
223 builder.fix_bin_or_dylib(&t!(entry).path());
226 // Update the timestamp of llvm-config to force rustc_llvm to be
227 // rebuilt. This is a hacky workaround for a deficiency in Cargo where
228 // the rerun-if-changed directive doesn't handle changes very well.
229 // https://github.com/rust-lang/cargo/issues/10791
230 // Cargo only compares the timestamp of the file relative to the last
231 // time `rustc_llvm` build script ran. However, the timestamps of the
232 // files in the tarball are in the past, so it doesn't trigger a
234 let now = filetime::FileTime::from_system_time(std::time::SystemTime::now());
235 let llvm_config = llvm_root.join("bin").join(exe("llvm-config", builder.config.build));
236 t!(filetime::set_file_times(&llvm_config, now, now));
238 let llvm_lib = llvm_root.join("lib");
239 for entry in t!(fs::read_dir(&llvm_lib)) {
240 let lib = t!(entry).path();
241 if lib.extension().map_or(false, |ext| ext == "so") {
242 builder.fix_bin_or_dylib(&lib);
245 t!(fs::write(llvm_stamp, key));
249 fn download_ci_llvm(builder: &Builder<'_>, llvm_sha: &str) {
250 let llvm_assertions = builder.config.llvm_assertions;
252 let cache_prefix = format!("llvm-{}-{}", llvm_sha, llvm_assertions);
253 let cache_dst = builder.out.join("cache");
254 let rustc_cache = cache_dst.join(cache_prefix);
255 if !rustc_cache.exists() {
256 t!(fs::create_dir_all(&rustc_cache));
258 let base = if llvm_assertions {
259 &builder.config.stage0_metadata.config.artifacts_with_llvm_assertions_server
261 &builder.config.stage0_metadata.config.artifacts_server
263 let channel = builder.config.artifact_channel(llvm_sha);
264 let filename = format!("rust-dev-{}-{}.tar.xz", channel, builder.build.build.triple);
265 let tarball = rustc_cache.join(&filename);
266 if !tarball.exists() {
267 let help_on_error = "error: failed to download llvm from ci
269 help: old builds get deleted after a certain time
270 help: if trying to compile an old commit of rustc, disable `download-ci-llvm` in config.toml:
273 download-ci-llvm = false
275 builder.download_component(
276 &format!("{base}/{llvm_sha}/{filename}"),
281 let llvm_root = builder.config.ci_llvm_root();
282 builder.unpack(&tarball, &llvm_root, "rust-dev");
285 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
287 pub target: TargetSelection,
291 type Output = PathBuf; // path to llvm-config
293 const ONLY_HOSTS: bool = true;
295 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
296 run.path("src/llvm-project").path("src/llvm-project/llvm")
299 fn make_run(run: RunConfig<'_>) {
300 run.builder.ensure(Llvm { target: run.target });
303 /// Compile LLVM for `target`.
304 fn run(self, builder: &Builder<'_>) -> PathBuf {
305 let target = self.target;
306 let target_native = if self.target.starts_with("riscv") {
307 // RISC-V target triples in Rust is not named the same as C compiler target triples.
308 // This converts Rust RISC-V target triples to C compiler triples.
309 let idx = target.triple.find('-').unwrap();
311 format!("riscv{}{}", &target.triple[5..7], &target.triple[idx..])
312 } else if self.target.starts_with("powerpc") && self.target.ends_with("freebsd") {
313 // FreeBSD 13 had incompatible ABI changes on all PowerPC platforms.
314 // Set the version suffix to 13.0 so the correct target details are used.
315 format!("{}{}", self.target, "13.0")
320 let Meta { stamp, build_llvm_config, out_dir, root } =
321 match prebuilt_llvm_config(builder, target) {
326 builder.update_submodule(&Path::new("src").join("llvm-project"));
327 if builder.llvm_link_shared() && target.contains("windows") {
328 panic!("shared linking to LLVM is not currently supported on {}", target.triple);
331 builder.info(&format!("Building LLVM for {}", target));
333 let _time = util::timeit(&builder);
334 t!(fs::create_dir_all(&out_dir));
336 // https://llvm.org/docs/CMake.html
337 let mut cfg = cmake::Config::new(builder.src.join(root));
338 let mut ldflags = LdFlags::default();
340 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
341 (false, _) => "Debug",
342 (true, false) => "Release",
343 (true, true) => "RelWithDebInfo",
346 // NOTE: remember to also update `config.toml.example` when changing the
348 let llvm_targets = match &builder.config.llvm_targets {
351 "AArch64;ARM;BPF;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;\
352 Sparc;SystemZ;WebAssembly;X86"
356 let llvm_exp_targets = match builder.config.llvm_experimental_targets {
361 let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
362 let plugins = if builder.config.llvm_plugins { "ON" } else { "OFF" };
363 let enable_tests = if builder.config.llvm_tests { "ON" } else { "OFF" };
365 cfg.out_dir(&out_dir)
367 .define("LLVM_ENABLE_ASSERTIONS", assertions)
368 .define("LLVM_ENABLE_PLUGINS", plugins)
369 .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
370 .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
371 .define("LLVM_INCLUDE_EXAMPLES", "OFF")
372 .define("LLVM_INCLUDE_DOCS", "OFF")
373 .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
374 .define("LLVM_INCLUDE_TESTS", enable_tests)
375 .define("LLVM_ENABLE_TERMINFO", "OFF")
376 .define("LLVM_ENABLE_LIBEDIT", "OFF")
377 .define("LLVM_ENABLE_BINDINGS", "OFF")
378 .define("LLVM_ENABLE_Z3_SOLVER", "OFF")
379 .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
380 .define("LLVM_TARGET_ARCH", target_native.split('-').next().unwrap())
381 .define("LLVM_DEFAULT_TARGET_TRIPLE", target_native);
383 // Parts of our test suite rely on the `FileCheck` tool, which is built by default in
384 // `build/$TARGET/llvm/build/bin` is but *not* then installed to `build/$TARGET/llvm/bin`.
385 // This flag makes sure `FileCheck` is copied in the final binaries directory.
386 cfg.define("LLVM_INSTALL_UTILS", "ON");
388 if builder.config.llvm_profile_generate {
389 cfg.define("LLVM_BUILD_INSTRUMENTED", "IR");
390 if let Ok(llvm_profile_dir) = std::env::var("LLVM_PROFILE_DIR") {
391 cfg.define("LLVM_PROFILE_DATA_DIR", llvm_profile_dir);
393 cfg.define("LLVM_BUILD_RUNTIME", "No");
395 if let Some(path) = builder.config.llvm_profile_use.as_ref() {
396 cfg.define("LLVM_PROFDATA_FILE", &path);
399 // Disable zstd to avoid a dependency on libzstd.so.
400 cfg.define("LLVM_ENABLE_ZSTD", "OFF");
402 if target != "aarch64-apple-darwin" && !target.contains("windows") {
403 cfg.define("LLVM_ENABLE_ZLIB", "ON");
405 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
408 // Are we compiling for iOS/tvOS/watchOS?
409 if target.contains("apple-ios")
410 || target.contains("apple-tvos")
411 || target.contains("apple-watchos")
413 // These two defines prevent CMake from automatically trying to add a MacOSX sysroot, which leads to a compiler error.
414 cfg.define("CMAKE_OSX_SYSROOT", "/");
415 cfg.define("CMAKE_OSX_DEPLOYMENT_TARGET", "");
416 // Prevent cmake from adding -bundle to CFLAGS automatically, which leads to a compiler error because "-bitcode_bundle" also gets added.
417 cfg.define("LLVM_ENABLE_PLUGINS", "OFF");
418 // Zlib fails to link properly, leading to a compiler error.
419 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
422 // This setting makes the LLVM tools link to the dynamic LLVM library,
423 // which saves both memory during parallel links and overall disk space
424 // for the tools. We don't do this on every platform as it doesn't work
425 // equally well everywhere.
426 if builder.llvm_link_shared() {
427 cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
430 if target.starts_with("riscv") && !target.contains("freebsd") && !target.contains("openbsd")
432 // RISC-V GCC erroneously requires linking against
433 // `libatomic` when using 1-byte and 2-byte C++
434 // atomics but the LLVM build system check cannot
435 // detect this. Therefore it is set manually here.
436 // Some BSD uses Clang as its system compiler and
437 // provides no libatomic in its base system so does
439 ldflags.exe.push(" -latomic");
440 ldflags.shared.push(" -latomic");
443 if target.contains("msvc") {
444 cfg.define("LLVM_USE_CRT_DEBUG", "MT");
445 cfg.define("LLVM_USE_CRT_RELEASE", "MT");
446 cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
447 cfg.static_crt(true);
450 if target.starts_with("i686") {
451 cfg.define("LLVM_BUILD_32_BITS", "ON");
454 let mut enabled_llvm_projects = Vec::new();
456 if util::forcing_clang_based_tests() {
457 enabled_llvm_projects.push("clang");
458 enabled_llvm_projects.push("compiler-rt");
461 if builder.config.llvm_polly {
462 enabled_llvm_projects.push("polly");
465 if builder.config.llvm_clang {
466 enabled_llvm_projects.push("clang");
469 // We want libxml to be disabled.
470 // See https://github.com/rust-lang/rust/pull/50104
471 cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
473 if !enabled_llvm_projects.is_empty() {
474 enabled_llvm_projects.sort();
475 enabled_llvm_projects.dedup();
476 cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
479 if let Some(num_linkers) = builder.config.llvm_link_jobs {
481 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
485 // Workaround for ppc32 lld limitation
486 if target == "powerpc-unknown-freebsd" {
487 ldflags.exe.push(" -fuse-ld=bfd");
490 // https://llvm.org/docs/HowToCrossCompileLLVM.html
491 if target != builder.config.build {
492 builder.ensure(Llvm { target: builder.config.build });
493 // FIXME: if the llvm root for the build triple is overridden then we
494 // should use llvm-tblgen from there, also should verify that it
495 // actually exists most of the time in normal installs of LLVM.
496 let host_bin = builder.llvm_out(builder.config.build).join("bin");
497 cfg.define("LLVM_TABLEGEN", host_bin.join("llvm-tblgen").with_extension(EXE_EXTENSION));
498 // LLVM_NM is required for cross compiling using MSVC
499 cfg.define("LLVM_NM", host_bin.join("llvm-nm").with_extension(EXE_EXTENSION));
502 host_bin.join("llvm-config").with_extension(EXE_EXTENSION),
504 if builder.config.llvm_clang {
505 let build_bin = builder.llvm_out(builder.config.build).join("build").join("bin");
506 let clang_tblgen = build_bin.join("clang-tblgen").with_extension(EXE_EXTENSION);
507 if !builder.config.dry_run && !clang_tblgen.exists() {
508 panic!("unable to find {}", clang_tblgen.display());
510 cfg.define("CLANG_TABLEGEN", clang_tblgen);
514 let llvm_version_suffix = if let Some(ref suffix) = builder.config.llvm_version_suffix {
515 // Allow version-suffix="" to not define a version suffix at all.
516 if !suffix.is_empty() { Some(suffix.to_string()) } else { None }
517 } else if builder.config.channel == "dev" {
518 // Changes to a version suffix require a complete rebuild of the LLVM.
519 // To avoid rebuilds during a time of version bump, don't include rustc
520 // release number on the dev channel.
521 Some("-rust-dev".to_string())
523 Some(format!("-rust-{}-{}", builder.version, builder.config.channel))
525 if let Some(ref suffix) = llvm_version_suffix {
526 cfg.define("LLVM_VERSION_SUFFIX", suffix);
529 configure_cmake(builder, target, &mut cfg, true, ldflags);
530 configure_llvm(builder, target, &mut cfg);
532 for (key, val) in &builder.config.llvm_build_config {
533 cfg.define(key, val);
536 // FIXME: we don't actually need to build all LLVM tools and all LLVM
537 // libraries here, e.g., we just want a few components and a few
538 // tools. Figure out how to filter them down and only build the right
539 // tools and libs on all platforms.
541 if builder.config.dry_run {
542 return build_llvm_config;
547 // When building LLVM with LLVM_LINK_LLVM_DYLIB for macOS, an unversioned
548 // libLLVM.dylib will be built. However, llvm-config will still look
549 // for a versioned path like libLLVM-14.dylib. Manually create a symbolic
550 // link to make llvm-config happy.
551 if builder.llvm_link_shared() && target.contains("apple-darwin") {
552 let mut cmd = Command::new(&build_llvm_config);
553 let version = output(cmd.arg("--version"));
554 let major = version.split('.').next().unwrap();
555 let lib_name = match llvm_version_suffix {
556 Some(s) => format!("libLLVM-{}{}.dylib", major, s),
557 None => format!("libLLVM-{}.dylib", major),
560 let lib_llvm = out_dir.join("build").join("lib").join(lib_name);
561 if !lib_llvm.exists() {
562 t!(builder.symlink_file("libLLVM.dylib", &lib_llvm));
572 fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
573 if !builder.config.llvm_version_check {
577 if builder.config.dry_run {
581 let mut cmd = Command::new(llvm_config);
582 let version = output(cmd.arg("--version"));
583 let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
584 if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
589 panic!("\n\nbad LLVM version: {}, need >=13.0\n\n", version)
593 builder: &Builder<'_>,
594 target: TargetSelection,
595 cfg: &mut cmake::Config,
596 use_compiler_launcher: bool,
597 mut ldflags: LdFlags,
599 // Do not print installation messages for up-to-date files.
600 // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
601 cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
603 // Do not allow the user's value of DESTDIR to influence where
604 // LLVM will install itself. LLVM must always be installed in our
605 // own build directories.
606 cfg.env("DESTDIR", "");
609 cfg.generator("Ninja");
611 cfg.target(&target.triple).host(&builder.config.build.triple);
613 if target != builder.config.build {
614 cfg.define("CMAKE_CROSSCOMPILING", "True");
616 if target.contains("netbsd") {
617 cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
618 } else if target.contains("freebsd") {
619 cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
620 } else if target.contains("windows") {
621 cfg.define("CMAKE_SYSTEM_NAME", "Windows");
622 } else if target.contains("haiku") {
623 cfg.define("CMAKE_SYSTEM_NAME", "Haiku");
624 } else if target.contains("solaris") || target.contains("illumos") {
625 cfg.define("CMAKE_SYSTEM_NAME", "SunOS");
627 // When cross-compiling we should also set CMAKE_SYSTEM_VERSION, but in
628 // that case like CMake we cannot easily determine system version either.
630 // Since, the LLVM itself makes rather limited use of version checks in
631 // CMakeFiles (and then only in tests), and so far no issues have been
632 // reported, the system version is currently left unset.
634 if target.contains("darwin") {
635 // Make sure that CMake does not build universal binaries on macOS.
636 // Explicitly specify the one single target architecture.
637 if target.starts_with("aarch64") {
638 // macOS uses a different name for building arm64
639 cfg.define("CMAKE_OSX_ARCHITECTURES", "arm64");
641 cfg.define("CMAKE_OSX_ARCHITECTURES", target.triple.split('-').next().unwrap());
646 let sanitize_cc = |cc: &Path| {
647 if target.contains("msvc") {
648 OsString::from(cc.to_str().unwrap().replace("\\", "/"))
650 cc.as_os_str().to_owned()
654 // MSVC with CMake uses msbuild by default which doesn't respect these
655 // vars that we'd otherwise configure. In that case we just skip this
657 if target.contains("msvc") && !builder.ninja() {
661 let (cc, cxx) = match builder.config.llvm_clang_cl {
662 Some(ref cl) => (cl.as_ref(), cl.as_ref()),
663 None => (builder.cc(target), builder.cxx(target).unwrap()),
666 // Handle msvc + ninja + ccache specially (this is what the bots use)
667 if target.contains("msvc") && builder.ninja() && builder.config.ccache.is_some() {
668 let mut wrap_cc = env::current_exe().expect("failed to get cwd");
669 wrap_cc.set_file_name("sccache-plus-cl.exe");
671 cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
672 .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
673 cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
674 .env("SCCACHE_TARGET", target.triple)
675 .env("SCCACHE_CC", &cc)
676 .env("SCCACHE_CXX", &cxx);
678 // Building LLVM on MSVC can be a little ludicrous at times. We're so far
679 // off the beaten path here that I'm not really sure this is even half
680 // supported any more. Here we're trying to:
682 // * Build LLVM on MSVC
683 // * Build LLVM with `clang-cl` instead of `cl.exe`
684 // * Build a project with `sccache`
685 // * Build for 32-bit as well
686 // * Build with Ninja
688 // For `cl.exe` there are different binaries to compile 32/64 bit which
689 // we use but for `clang-cl` there's only one which internally
690 // multiplexes via flags. As a result it appears that CMake's detection
691 // of a compiler's architecture and such on MSVC **doesn't** pass any
692 // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
693 // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
694 // definitely causes problems since all the env vars are pointing to
697 // To hack around this... again... we pass an argument that's
698 // unconditionally passed in the sccache shim. This'll get CMake to
699 // correctly diagnose it's doing a 32-bit compilation and LLVM will
700 // internally configure itself appropriately.
701 if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
702 cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
705 // If ccache is configured we inform the build a little differently how
706 // to invoke ccache while also invoking our compilers.
707 if use_compiler_launcher {
708 if let Some(ref ccache) = builder.config.ccache {
709 cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
710 .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
713 cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
714 .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx))
715 .define("CMAKE_ASM_COMPILER", sanitize_cc(cc));
718 cfg.build_arg("-j").build_arg(builder.jobs().to_string());
719 let mut cflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::C).join(" ").into();
720 if let Some(ref s) = builder.config.llvm_cflags {
724 // Some compiler features used by LLVM (such as thread locals) will not work on a min version below iOS 10.
725 if target.contains("apple-ios") {
726 if target.contains("86-") {
727 cflags.push(" -miphonesimulator-version-min=10.0");
729 cflags.push(" -miphoneos-version-min=10.0");
732 if builder.config.llvm_clang_cl.is_some() {
733 cflags.push(&format!(" --target={}", target));
735 cfg.define("CMAKE_C_FLAGS", cflags);
736 let mut cxxflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::Cxx).join(" ").into();
737 if let Some(ref s) = builder.config.llvm_cxxflags {
741 if builder.config.llvm_clang_cl.is_some() {
742 cxxflags.push(&format!(" --target={}", target));
744 cfg.define("CMAKE_CXX_FLAGS", cxxflags);
745 if let Some(ar) = builder.ar(target) {
746 if ar.is_absolute() {
747 // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
748 // tries to resolve this path in the LLVM build directory.
749 cfg.define("CMAKE_AR", sanitize_cc(ar));
753 if let Some(ranlib) = builder.ranlib(target) {
754 if ranlib.is_absolute() {
755 // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
756 // tries to resolve this path in the LLVM build directory.
757 cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
761 if let Some(ref flags) = builder.config.llvm_ldflags {
762 ldflags.push_all(flags);
765 if let Some(flags) = get_var("LDFLAGS", &builder.config.build.triple, &target.triple) {
766 ldflags.push_all(&flags);
769 // For distribution we want the LLVM tools to be *statically* linked to libstdc++.
770 // We also do this if the user explicitly requested static libstdc++.
771 if builder.config.llvm_static_stdcpp {
772 if !target.contains("msvc") && !target.contains("netbsd") && !target.contains("solaris") {
773 if target.contains("apple") || target.contains("windows") {
774 ldflags.push_all("-static-libstdc++");
776 ldflags.push_all("-Wl,-Bsymbolic -static-libstdc++");
781 cfg.define("CMAKE_SHARED_LINKER_FLAGS", &ldflags.shared);
782 cfg.define("CMAKE_MODULE_LINKER_FLAGS", &ldflags.module);
783 cfg.define("CMAKE_EXE_LINKER_FLAGS", &ldflags.exe);
785 if env::var_os("SCCACHE_ERROR_LOG").is_some() {
786 cfg.env("RUSTC_LOG", "sccache=warn");
790 fn configure_llvm(builder: &Builder<'_>, target: TargetSelection, cfg: &mut cmake::Config) {
791 // ThinLTO is only available when building with LLVM, enabling LLD is required.
792 // Apple's linker ld64 supports ThinLTO out of the box though, so don't use LLD on Darwin.
793 if builder.config.llvm_thin_lto {
794 cfg.define("LLVM_ENABLE_LTO", "Thin");
795 if !target.contains("apple") {
796 cfg.define("LLVM_ENABLE_LLD", "ON");
800 if let Some(ref linker) = builder.config.llvm_use_linker {
801 cfg.define("LLVM_USE_LINKER", linker);
804 if builder.config.llvm_allow_old_toolchain {
805 cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
809 // Adapted from https://github.com/alexcrichton/cc-rs/blob/fba7feded71ee4f63cfe885673ead6d7b4f2f454/src/lib.rs#L2347-L2365
810 fn get_var(var_base: &str, host: &str, target: &str) -> Option<OsString> {
811 let kind = if host == target { "HOST" } else { "TARGET" };
812 let target_u = target.replace("-", "_");
813 env::var_os(&format!("{}_{}", var_base, target))
814 .or_else(|| env::var_os(&format!("{}_{}", var_base, target_u)))
815 .or_else(|| env::var_os(&format!("{}_{}", kind, var_base)))
816 .or_else(|| env::var_os(var_base))
819 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
821 pub target: TargetSelection,
825 type Output = PathBuf;
826 const ONLY_HOSTS: bool = true;
828 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
829 run.path("src/llvm-project/lld")
832 fn make_run(run: RunConfig<'_>) {
833 run.builder.ensure(Lld { target: run.target });
836 /// Compile LLD for `target`.
837 fn run(self, builder: &Builder<'_>) -> PathBuf {
838 if builder.config.dry_run {
839 return PathBuf::from("lld-out-dir-test-gen");
841 let target = self.target;
843 let llvm_config = builder.ensure(Llvm { target: self.target });
845 let out_dir = builder.lld_out(target);
846 let done_stamp = out_dir.join("lld-finished-building");
847 if done_stamp.exists() {
851 builder.info(&format!("Building LLD for {}", target));
852 let _time = util::timeit(&builder);
853 t!(fs::create_dir_all(&out_dir));
855 let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
856 let mut ldflags = LdFlags::default();
858 // When building LLD as part of a build with instrumentation on windows, for example
859 // when doing PGO on CI, cmake or clang-cl don't automatically link clang's
860 // profiler runtime in. In that case, we need to manually ask cmake to do it, to avoid
861 // linking errors, much like LLVM's cmake setup does in that situation.
862 if builder.config.llvm_profile_generate && target.contains("msvc") {
863 if let Some(clang_cl_path) = builder.config.llvm_clang_cl.as_ref() {
864 // Find clang's runtime library directory and push that as a search path to the
865 // cmake linker flags.
866 let clang_rt_dir = get_clang_cl_resource_dir(clang_cl_path);
867 ldflags.push_all(&format!("/libpath:{}", clang_rt_dir.display()));
871 configure_cmake(builder, target, &mut cfg, true, ldflags);
872 configure_llvm(builder, target, &mut cfg);
874 // This is an awful, awful hack. Discovered when we migrated to using
875 // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
876 // tree, will execute `llvm-config --cmakedir` and then tell CMake about
877 // that directory for later processing. Unfortunately if this path has
878 // forward slashes in it (which it basically always does on Windows)
879 // then CMake will hit a syntax error later on as... something isn't
882 // Instead of attempting to fix this problem in upstream CMake and/or
883 // LLVM/LLD we just hack around it here. This thin wrapper will take the
884 // output from llvm-config and replace all instances of `\` with `/` to
885 // ensure we don't hit the same bugs with escaping. It means that you
886 // can't build on a system where your paths require `\` on Windows, but
887 // there's probably a lot of reasons you can't do that other than this.
888 let llvm_config_shim = env::current_exe().unwrap().with_file_name("llvm-config-wrapper");
890 // Re-use the same flags as llvm to control the level of debug information
891 // generated for lld.
892 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
893 (false, _) => "Debug",
894 (true, false) => "Release",
895 (true, true) => "RelWithDebInfo",
898 cfg.out_dir(&out_dir)
900 .env("LLVM_CONFIG_REAL", &llvm_config)
901 .define("LLVM_CONFIG_PATH", llvm_config_shim)
902 .define("LLVM_INCLUDE_TESTS", "OFF");
904 // While we're using this horrible workaround to shim the execution of
905 // llvm-config, let's just pile on more. I can't seem to figure out how
906 // to build LLD as a standalone project and also cross-compile it at the
907 // same time. It wants a natively executable `llvm-config` to learn
908 // about LLVM, but then it learns about all the host configuration of
909 // LLVM and tries to link to host LLVM libraries.
911 // To work around that we tell our shim to replace anything with the
912 // build target with the actual target instead. This'll break parts of
913 // LLD though which try to execute host tools, such as llvm-tblgen, so
914 // we specifically tell it where to find those. This is likely super
915 // brittle and will break over time. If anyone knows better how to
916 // cross-compile LLD it would be much appreciated to fix this!
917 if target != builder.config.build {
918 cfg.env("LLVM_CONFIG_SHIM_REPLACE", &builder.config.build.triple)
919 .env("LLVM_CONFIG_SHIM_REPLACE_WITH", &target.triple)
922 llvm_config.with_file_name("llvm-tblgen").with_extension(EXE_EXTENSION),
926 // Explicitly set C++ standard, because upstream doesn't do so
927 // for standalone builds.
928 cfg.define("CMAKE_CXX_STANDARD", "14");
932 t!(File::create(&done_stamp));
937 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
938 pub struct TestHelpers {
939 pub target: TargetSelection,
942 impl Step for TestHelpers {
945 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
946 run.path("src/test/auxiliary/rust_test_helpers.c")
949 fn make_run(run: RunConfig<'_>) {
950 run.builder.ensure(TestHelpers { target: run.target })
953 /// Compiles the `rust_test_helpers.c` library which we used in various
954 /// `run-pass` tests for ABI testing.
955 fn run(self, builder: &Builder<'_>) {
956 if builder.config.dry_run {
959 // The x86_64-fortanix-unknown-sgx target doesn't have a working C
960 // toolchain. However, some x86_64 ELF objects can be linked
961 // without issues. Use this hack to compile the test helpers.
962 let target = if self.target == "x86_64-fortanix-unknown-sgx" {
963 TargetSelection::from_user("x86_64-unknown-linux-gnu")
967 let dst = builder.test_helpers_out(target);
968 let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
969 if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
973 builder.info("Building test helpers");
974 t!(fs::create_dir_all(&dst));
975 let mut cfg = cc::Build::new();
976 // FIXME: Workaround for https://github.com/emscripten-core/emscripten/issues/9013
977 if target.contains("emscripten") {
981 // We may have found various cross-compilers a little differently due to our
982 // extra configuration, so inform cc of these compilers. Note, though, that
983 // on MSVC we still need cc's detection of env vars (ugh).
984 if !target.contains("msvc") {
985 if let Some(ar) = builder.ar(target) {
988 cfg.compiler(builder.cc(target));
990 cfg.cargo_metadata(false)
992 .target(&target.triple)
993 .host(&builder.config.build.triple)
997 .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
998 .compile("rust_test_helpers");
1002 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1003 pub struct Sanitizers {
1004 pub target: TargetSelection,
1007 impl Step for Sanitizers {
1008 type Output = Vec<SanitizerRuntime>;
1010 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1011 run.alias("sanitizers")
1014 fn make_run(run: RunConfig<'_>) {
1015 run.builder.ensure(Sanitizers { target: run.target });
1018 /// Builds sanitizer runtime libraries.
1019 fn run(self, builder: &Builder<'_>) -> Self::Output {
1020 let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
1021 if !compiler_rt_dir.exists() {
1025 let out_dir = builder.native_dir(self.target).join("sanitizers");
1026 let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
1027 if runtimes.is_empty() {
1031 let llvm_config = builder.ensure(Llvm { target: builder.config.build });
1032 if builder.config.dry_run {
1036 let stamp = out_dir.join("sanitizers-finished-building");
1037 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
1039 if stamp.is_done() {
1040 if stamp.hash.is_none() {
1041 builder.info(&format!(
1042 "Rebuild sanitizers by removing the file `{}`",
1043 stamp.path.display()
1049 builder.info(&format!("Building sanitizers for {}", self.target));
1051 let _time = util::timeit(&builder);
1053 let mut cfg = cmake::Config::new(&compiler_rt_dir);
1054 cfg.profile("Release");
1055 cfg.define("CMAKE_C_COMPILER_TARGET", self.target.triple);
1056 cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
1057 cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
1058 cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
1059 cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
1060 cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
1061 cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
1062 cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
1063 cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
1064 cfg.define("LLVM_CONFIG_PATH", &llvm_config);
1066 // On Darwin targets the sanitizer runtimes are build as universal binaries.
1067 // Unfortunately sccache currently lacks support to build them successfully.
1068 // Disable compiler launcher on Darwin targets to avoid potential issues.
1069 let use_compiler_launcher = !self.target.contains("apple-darwin");
1070 configure_cmake(builder, self.target, &mut cfg, use_compiler_launcher, LdFlags::default());
1072 t!(fs::create_dir_all(&out_dir));
1073 cfg.out_dir(out_dir);
1075 for runtime in &runtimes {
1076 cfg.build_target(&runtime.cmake_target);
1085 #[derive(Clone, Debug)]
1086 pub struct SanitizerRuntime {
1087 /// CMake target used to build the runtime.
1088 pub cmake_target: String,
1089 /// Path to the built runtime library.
1091 /// Library filename that will be used rustc.
1095 /// Returns sanitizers available on a given target.
1096 fn supported_sanitizers(
1098 target: TargetSelection,
1100 ) -> Vec<SanitizerRuntime> {
1101 let darwin_libs = |os: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
1104 .map(move |c| SanitizerRuntime {
1105 cmake_target: format!("clang_rt.{}_{}_dynamic", c, os),
1107 .join(&format!("build/lib/darwin/libclang_rt.{}_{}_dynamic.dylib", c, os)),
1108 name: format!("librustc-{}_rt.{}.dylib", channel, c),
1113 let common_libs = |os: &str, arch: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
1116 .map(move |c| SanitizerRuntime {
1117 cmake_target: format!("clang_rt.{}-{}", c, arch),
1118 path: out_dir.join(&format!("build/lib/{}/libclang_rt.{}-{}.a", os, c, arch)),
1119 name: format!("librustc-{}_rt.{}.a", channel, c),
1124 match &*target.triple {
1125 "aarch64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
1126 "aarch64-fuchsia" => common_libs("fuchsia", "aarch64", &["asan"]),
1127 "aarch64-unknown-linux-gnu" => {
1128 common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan", "hwasan"])
1130 "x86_64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
1131 "x86_64-fuchsia" => common_libs("fuchsia", "x86_64", &["asan"]),
1132 "x86_64-unknown-freebsd" => common_libs("freebsd", "x86_64", &["asan", "msan", "tsan"]),
1133 "x86_64-unknown-netbsd" => {
1134 common_libs("netbsd", "x86_64", &["asan", "lsan", "msan", "tsan"])
1136 "x86_64-unknown-illumos" => common_libs("illumos", "x86_64", &["asan"]),
1137 "x86_64-pc-solaris" => common_libs("solaris", "x86_64", &["asan"]),
1138 "x86_64-unknown-linux-gnu" => {
1139 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
1141 "x86_64-unknown-linux-musl" => {
1142 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
1150 hash: Option<Vec<u8>>,
1154 fn new(path: PathBuf, hash: Option<&str>) -> Self {
1155 HashStamp { path, hash: hash.map(|s| s.as_bytes().to_owned()) }
1158 fn is_done(&self) -> bool {
1159 match fs::read(&self.path) {
1160 Ok(h) => self.hash.as_deref().unwrap_or(b"") == h.as_slice(),
1161 Err(e) if e.kind() == io::ErrorKind::NotFound => false,
1163 panic!("failed to read stamp file `{}`: {}", self.path.display(), e);
1168 fn remove(&self) -> io::Result<()> {
1169 match fs::remove_file(&self.path) {
1172 if e.kind() == io::ErrorKind::NotFound {
1181 fn write(&self) -> io::Result<()> {
1182 fs::write(&self.path, self.hash.as_deref().unwrap_or(b""))
1186 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1187 pub struct CrtBeginEnd {
1188 pub target: TargetSelection,
1191 impl Step for CrtBeginEnd {
1192 type Output = PathBuf;
1194 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1195 run.path("src/llvm-project/compiler-rt/lib/crt")
1198 fn make_run(run: RunConfig<'_>) {
1199 run.builder.ensure(CrtBeginEnd { target: run.target });
1202 /// Build crtbegin.o/crtend.o for musl target.
1203 fn run(self, builder: &Builder<'_>) -> Self::Output {
1204 let out_dir = builder.native_dir(self.target).join("crt");
1206 if builder.config.dry_run {
1210 let crtbegin_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtbegin.c");
1211 let crtend_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtend.c");
1212 if up_to_date(&crtbegin_src, &out_dir.join("crtbegin.o"))
1213 && up_to_date(&crtend_src, &out_dir.join("crtendS.o"))
1218 builder.info("Building crtbegin.o and crtend.o");
1219 t!(fs::create_dir_all(&out_dir));
1221 let mut cfg = cc::Build::new();
1223 if let Some(ar) = builder.ar(self.target) {
1226 cfg.compiler(builder.cc(self.target));
1227 cfg.cargo_metadata(false)
1229 .target(&self.target.triple)
1230 .host(&builder.config.build.triple)
1237 // Those flags are defined in src/llvm-project/compiler-rt/lib/crt/CMakeLists.txt
1238 // Currently only consumer of those objects is musl, which use .init_array/.fini_array
1239 // instead of .ctors/.dtors
1240 cfg.flag("-std=c11")
1241 .define("CRT_HAS_INITFINI_ARRAY", None)
1242 .define("EH_USE_FRAME_REGISTRY", None);
1246 t!(fs::copy(out_dir.join("crtbegin.o"), out_dir.join("crtbeginS.o")));
1247 t!(fs::copy(out_dir.join("crtend.o"), out_dir.join("crtendS.o")));
1252 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1253 pub struct Libunwind {
1254 pub target: TargetSelection,
1257 impl Step for Libunwind {
1258 type Output = PathBuf;
1260 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1261 run.path("src/llvm-project/libunwind")
1264 fn make_run(run: RunConfig<'_>) {
1265 run.builder.ensure(Libunwind { target: run.target });
1268 /// Build linunwind.a
1269 fn run(self, builder: &Builder<'_>) -> Self::Output {
1270 if builder.config.dry_run {
1271 return PathBuf::new();
1274 let out_dir = builder.native_dir(self.target).join("libunwind");
1275 let root = builder.src.join("src/llvm-project/libunwind");
1277 if up_to_date(&root, &out_dir.join("libunwind.a")) {
1281 builder.info(&format!("Building libunwind.a for {}", self.target.triple));
1282 t!(fs::create_dir_all(&out_dir));
1284 let mut cc_cfg = cc::Build::new();
1285 let mut cpp_cfg = cc::Build::new();
1288 cpp_cfg.cpp_set_stdlib(None);
1289 cpp_cfg.flag("-nostdinc++");
1290 cpp_cfg.flag("-fno-exceptions");
1291 cpp_cfg.flag("-fno-rtti");
1292 cpp_cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
1294 for cfg in [&mut cc_cfg, &mut cpp_cfg].iter_mut() {
1295 if let Some(ar) = builder.ar(self.target) {
1298 cfg.target(&self.target.triple);
1299 cfg.host(&builder.config.build.triple);
1300 cfg.warnings(false);
1302 // get_compiler() need set opt_level first.
1304 cfg.flag("-fstrict-aliasing");
1305 cfg.flag("-funwind-tables");
1306 cfg.flag("-fvisibility=hidden");
1307 cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
1308 cfg.include(root.join("include"));
1309 cfg.cargo_metadata(false);
1310 cfg.out_dir(&out_dir);
1312 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1313 cfg.static_flag(true);
1314 cfg.flag("-fno-stack-protector");
1315 cfg.flag("-ffreestanding");
1316 cfg.flag("-fexceptions");
1318 // easiest way to undefine since no API available in cc::Build to undefine
1319 cfg.flag("-U_FORTIFY_SOURCE");
1320 cfg.define("_FORTIFY_SOURCE", "0");
1321 cfg.define("RUST_SGX", "1");
1322 cfg.define("__NO_STRING_INLINES", None);
1323 cfg.define("__NO_MATH_INLINES", None);
1324 cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
1325 cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
1326 cfg.define("NDEBUG", None);
1328 if self.target.contains("windows") {
1329 cfg.define("_LIBUNWIND_HIDE_SYMBOLS", "1");
1330 cfg.define("_LIBUNWIND_IS_NATIVE_ONLY", "1");
1334 cc_cfg.compiler(builder.cc(self.target));
1335 if let Ok(cxx) = builder.cxx(self.target) {
1336 cpp_cfg.compiler(cxx);
1338 cc_cfg.compiler(builder.cc(self.target));
1341 // Don't set this for clang
1342 // By default, Clang builds C code in GNU C17 mode.
1343 // By default, Clang builds C++ code according to the C++98 standard,
1344 // with many C++11 features accepted as extensions.
1345 if cc_cfg.get_compiler().is_like_gnu() {
1346 cc_cfg.flag("-std=c99");
1348 if cpp_cfg.get_compiler().is_like_gnu() {
1349 cpp_cfg.flag("-std=c++11");
1352 if self.target.contains("x86_64-fortanix-unknown-sgx") || self.target.contains("musl") {
1353 // use the same GCC C compiler command to compile C++ code so we do not need to setup the
1354 // C++ compiler env variables on the builders.
1355 // Don't set this for clang++, as clang++ is able to compile this without libc++.
1356 if cpp_cfg.get_compiler().is_like_gnu() {
1358 cpp_cfg.compiler(builder.cc(self.target));
1362 let mut c_sources = vec![
1364 "UnwindLevel1-gcc-ext.c",
1366 "UnwindRegistersRestore.S",
1367 "UnwindRegistersSave.S",
1370 let cpp_sources = vec!["Unwind-EHABI.cpp", "Unwind-seh.cpp", "libunwind.cpp"];
1371 let cpp_len = cpp_sources.len();
1373 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1374 c_sources.push("UnwindRustSgx.c");
1377 for src in c_sources {
1378 cc_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1381 for src in &cpp_sources {
1382 cpp_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1385 cpp_cfg.compile("unwind-cpp");
1387 // FIXME: https://github.com/alexcrichton/cc-rs/issues/545#issuecomment-679242845
1389 for entry in fs::read_dir(&out_dir).unwrap() {
1390 let file = entry.unwrap().path().canonicalize().unwrap();
1391 if file.is_file() && file.extension() == Some(OsStr::new("o")) {
1392 // file name starts with "Unwind-EHABI", "Unwind-seh" or "libunwind"
1393 let file_name = file.file_name().unwrap().to_str().expect("UTF-8 file name");
1394 if cpp_sources.iter().any(|f| file_name.starts_with(&f[..f.len() - 4])) {
1395 cc_cfg.object(&file);
1400 assert_eq!(cpp_len, count, "Can't get object files from {:?}", &out_dir);
1402 cc_cfg.compile("unwind");