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.
427 // If we're not linking rustc to a dynamic LLVM, though, then don't link
429 let llvm_link_shared =
430 builder.llvm_link_tools_dynamically(target) && builder.llvm_link_shared();
431 if llvm_link_shared {
432 cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
435 if target.starts_with("riscv") && !target.contains("freebsd") {
436 // RISC-V GCC erroneously requires linking against
437 // `libatomic` when using 1-byte and 2-byte C++
438 // atomics but the LLVM build system check cannot
439 // detect this. Therefore it is set manually here.
440 // FreeBSD uses Clang as its system compiler and
441 // provides no libatomic in its base system so does
443 ldflags.exe.push(" -latomic");
444 ldflags.shared.push(" -latomic");
447 if target.contains("msvc") {
448 cfg.define("LLVM_USE_CRT_DEBUG", "MT");
449 cfg.define("LLVM_USE_CRT_RELEASE", "MT");
450 cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
451 cfg.static_crt(true);
454 if target.starts_with("i686") {
455 cfg.define("LLVM_BUILD_32_BITS", "ON");
458 let mut enabled_llvm_projects = Vec::new();
460 if util::forcing_clang_based_tests() {
461 enabled_llvm_projects.push("clang");
462 enabled_llvm_projects.push("compiler-rt");
465 if builder.config.llvm_polly {
466 enabled_llvm_projects.push("polly");
469 if builder.config.llvm_clang {
470 enabled_llvm_projects.push("clang");
473 // We want libxml to be disabled.
474 // See https://github.com/rust-lang/rust/pull/50104
475 cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
477 if !enabled_llvm_projects.is_empty() {
478 enabled_llvm_projects.sort();
479 enabled_llvm_projects.dedup();
480 cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
483 if let Some(num_linkers) = builder.config.llvm_link_jobs {
485 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
489 // Workaround for ppc32 lld limitation
490 if target == "powerpc-unknown-freebsd" {
491 ldflags.exe.push(" -fuse-ld=bfd");
494 // https://llvm.org/docs/HowToCrossCompileLLVM.html
495 if target != builder.config.build {
496 builder.ensure(Llvm { target: builder.config.build });
497 // FIXME: if the llvm root for the build triple is overridden then we
498 // should use llvm-tblgen from there, also should verify that it
499 // actually exists most of the time in normal installs of LLVM.
500 let host_bin = builder.llvm_out(builder.config.build).join("bin");
501 cfg.define("LLVM_TABLEGEN", host_bin.join("llvm-tblgen").with_extension(EXE_EXTENSION));
502 // LLVM_NM is required for cross compiling using MSVC
503 cfg.define("LLVM_NM", host_bin.join("llvm-nm").with_extension(EXE_EXTENSION));
506 host_bin.join("llvm-config").with_extension(EXE_EXTENSION),
508 if builder.config.llvm_clang {
509 let build_bin = builder.llvm_out(builder.config.build).join("build").join("bin");
510 let clang_tblgen = build_bin.join("clang-tblgen").with_extension(EXE_EXTENSION);
511 if !builder.config.dry_run && !clang_tblgen.exists() {
512 panic!("unable to find {}", clang_tblgen.display());
514 cfg.define("CLANG_TABLEGEN", clang_tblgen);
518 let llvm_version_suffix = if let Some(ref suffix) = builder.config.llvm_version_suffix {
519 // Allow version-suffix="" to not define a version suffix at all.
520 if !suffix.is_empty() { Some(suffix.to_string()) } else { None }
521 } else if builder.config.channel == "dev" {
522 // Changes to a version suffix require a complete rebuild of the LLVM.
523 // To avoid rebuilds during a time of version bump, don't include rustc
524 // release number on the dev channel.
525 Some("-rust-dev".to_string())
527 Some(format!("-rust-{}-{}", builder.version, builder.config.channel))
529 if let Some(ref suffix) = llvm_version_suffix {
530 cfg.define("LLVM_VERSION_SUFFIX", suffix);
533 configure_cmake(builder, target, &mut cfg, true, ldflags);
534 configure_llvm(builder, target, &mut cfg);
536 for (key, val) in &builder.config.llvm_build_config {
537 cfg.define(key, val);
540 // FIXME: we don't actually need to build all LLVM tools and all LLVM
541 // libraries here, e.g., we just want a few components and a few
542 // tools. Figure out how to filter them down and only build the right
543 // tools and libs on all platforms.
545 if builder.config.dry_run {
546 return build_llvm_config;
551 // When building LLVM with LLVM_LINK_LLVM_DYLIB for macOS, an unversioned
552 // libLLVM.dylib will be built. However, llvm-config will still look
553 // for a versioned path like libLLVM-14.dylib. Manually create a symbolic
554 // link to make llvm-config happy.
555 if llvm_link_shared && target.contains("apple-darwin") {
556 let mut cmd = Command::new(&build_llvm_config);
557 let version = output(cmd.arg("--version"));
558 let major = version.split('.').next().unwrap();
559 let lib_name = match llvm_version_suffix {
560 Some(s) => format!("libLLVM-{}{}.dylib", major, s),
561 None => format!("libLLVM-{}.dylib", major),
564 let lib_llvm = out_dir.join("build").join("lib").join(lib_name);
565 if !lib_llvm.exists() {
566 t!(builder.symlink_file("libLLVM.dylib", &lib_llvm));
576 fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
577 if !builder.config.llvm_version_check {
581 if builder.config.dry_run {
585 let mut cmd = Command::new(llvm_config);
586 let version = output(cmd.arg("--version"));
587 let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
588 if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
593 panic!("\n\nbad LLVM version: {}, need >=13.0\n\n", version)
597 builder: &Builder<'_>,
598 target: TargetSelection,
599 cfg: &mut cmake::Config,
600 use_compiler_launcher: bool,
601 mut ldflags: LdFlags,
603 // Do not print installation messages for up-to-date files.
604 // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
605 cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
607 // Do not allow the user's value of DESTDIR to influence where
608 // LLVM will install itself. LLVM must always be installed in our
609 // own build directories.
610 cfg.env("DESTDIR", "");
613 cfg.generator("Ninja");
615 cfg.target(&target.triple).host(&builder.config.build.triple);
617 if target != builder.config.build {
618 cfg.define("CMAKE_CROSSCOMPILING", "True");
620 if target.contains("netbsd") {
621 cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
622 } else if target.contains("freebsd") {
623 cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
624 } else if target.contains("windows") {
625 cfg.define("CMAKE_SYSTEM_NAME", "Windows");
626 } else if target.contains("haiku") {
627 cfg.define("CMAKE_SYSTEM_NAME", "Haiku");
628 } else if target.contains("solaris") || target.contains("illumos") {
629 cfg.define("CMAKE_SYSTEM_NAME", "SunOS");
631 // When cross-compiling we should also set CMAKE_SYSTEM_VERSION, but in
632 // that case like CMake we cannot easily determine system version either.
634 // Since, the LLVM itself makes rather limited use of version checks in
635 // CMakeFiles (and then only in tests), and so far no issues have been
636 // reported, the system version is currently left unset.
638 if target.contains("darwin") {
639 // Make sure that CMake does not build universal binaries on macOS.
640 // Explicitly specifiy the one single target architecture.
641 if target.starts_with("aarch64") {
642 // macOS uses a different name for building arm64
643 cfg.define("CMAKE_OSX_ARCHITECTURES", "arm64");
645 cfg.define("CMAKE_OSX_ARCHITECTURES", target.triple.split('-').next().unwrap());
650 let sanitize_cc = |cc: &Path| {
651 if target.contains("msvc") {
652 OsString::from(cc.to_str().unwrap().replace("\\", "/"))
654 cc.as_os_str().to_owned()
658 // MSVC with CMake uses msbuild by default which doesn't respect these
659 // vars that we'd otherwise configure. In that case we just skip this
661 if target.contains("msvc") && !builder.ninja() {
665 let (cc, cxx) = match builder.config.llvm_clang_cl {
666 Some(ref cl) => (cl.as_ref(), cl.as_ref()),
667 None => (builder.cc(target), builder.cxx(target).unwrap()),
670 // Handle msvc + ninja + ccache specially (this is what the bots use)
671 if target.contains("msvc") && builder.ninja() && builder.config.ccache.is_some() {
672 let mut wrap_cc = env::current_exe().expect("failed to get cwd");
673 wrap_cc.set_file_name("sccache-plus-cl.exe");
675 cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
676 .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
677 cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
678 .env("SCCACHE_TARGET", target.triple)
679 .env("SCCACHE_CC", &cc)
680 .env("SCCACHE_CXX", &cxx);
682 // Building LLVM on MSVC can be a little ludicrous at times. We're so far
683 // off the beaten path here that I'm not really sure this is even half
684 // supported any more. Here we're trying to:
686 // * Build LLVM on MSVC
687 // * Build LLVM with `clang-cl` instead of `cl.exe`
688 // * Build a project with `sccache`
689 // * Build for 32-bit as well
690 // * Build with Ninja
692 // For `cl.exe` there are different binaries to compile 32/64 bit which
693 // we use but for `clang-cl` there's only one which internally
694 // multiplexes via flags. As a result it appears that CMake's detection
695 // of a compiler's architecture and such on MSVC **doesn't** pass any
696 // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
697 // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
698 // definitely causes problems since all the env vars are pointing to
701 // To hack around this... again... we pass an argument that's
702 // unconditionally passed in the sccache shim. This'll get CMake to
703 // correctly diagnose it's doing a 32-bit compilation and LLVM will
704 // internally configure itself appropriately.
705 if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
706 cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
709 // If ccache is configured we inform the build a little differently how
710 // to invoke ccache while also invoking our compilers.
711 if use_compiler_launcher {
712 if let Some(ref ccache) = builder.config.ccache {
713 cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
714 .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
717 cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
718 .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx))
719 .define("CMAKE_ASM_COMPILER", sanitize_cc(cc));
722 cfg.build_arg("-j").build_arg(builder.jobs().to_string());
723 let mut cflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::C).join(" ").into();
724 if let Some(ref s) = builder.config.llvm_cflags {
728 // Some compiler features used by LLVM (such as thread locals) will not work on a min version below iOS 10.
729 if target.contains("apple-ios") {
730 if target.contains("86-") {
731 cflags.push(" -miphonesimulator-version-min=10.0");
733 cflags.push(" -miphoneos-version-min=10.0");
736 if builder.config.llvm_clang_cl.is_some() {
737 cflags.push(&format!(" --target={}", target));
739 cfg.define("CMAKE_C_FLAGS", cflags);
740 let mut cxxflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::Cxx).join(" ").into();
741 if let Some(ref s) = builder.config.llvm_cxxflags {
745 if builder.config.llvm_clang_cl.is_some() {
746 cxxflags.push(&format!(" --target={}", target));
748 cfg.define("CMAKE_CXX_FLAGS", cxxflags);
749 if let Some(ar) = builder.ar(target) {
750 if ar.is_absolute() {
751 // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
752 // tries to resolve this path in the LLVM build directory.
753 cfg.define("CMAKE_AR", sanitize_cc(ar));
757 if let Some(ranlib) = builder.ranlib(target) {
758 if ranlib.is_absolute() {
759 // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
760 // tries to resolve this path in the LLVM build directory.
761 cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
765 if let Some(ref flags) = builder.config.llvm_ldflags {
766 ldflags.push_all(flags);
769 if let Some(flags) = get_var("LDFLAGS", &builder.config.build.triple, &target.triple) {
770 ldflags.push_all(&flags);
773 // For distribution we want the LLVM tools to be *statically* linked to libstdc++.
774 // We also do this if the user explicitly requested static libstdc++.
775 if builder.config.llvm_static_stdcpp {
776 if !target.contains("msvc") && !target.contains("netbsd") && !target.contains("solaris") {
777 if target.contains("apple") || target.contains("windows") {
778 ldflags.push_all("-static-libstdc++");
780 ldflags.push_all("-Wl,-Bsymbolic -static-libstdc++");
785 cfg.define("CMAKE_SHARED_LINKER_FLAGS", &ldflags.shared);
786 cfg.define("CMAKE_MODULE_LINKER_FLAGS", &ldflags.module);
787 cfg.define("CMAKE_EXE_LINKER_FLAGS", &ldflags.exe);
789 if env::var_os("SCCACHE_ERROR_LOG").is_some() {
790 cfg.env("RUSTC_LOG", "sccache=warn");
794 fn configure_llvm(builder: &Builder<'_>, target: TargetSelection, cfg: &mut cmake::Config) {
795 // ThinLTO is only available when building with LLVM, enabling LLD is required.
796 // Apple's linker ld64 supports ThinLTO out of the box though, so don't use LLD on Darwin.
797 if builder.config.llvm_thin_lto {
798 cfg.define("LLVM_ENABLE_LTO", "Thin");
799 if !target.contains("apple") {
800 cfg.define("LLVM_ENABLE_LLD", "ON");
804 if let Some(ref linker) = builder.config.llvm_use_linker {
805 cfg.define("LLVM_USE_LINKER", linker);
808 if builder.config.llvm_allow_old_toolchain {
809 cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
813 // Adapted from https://github.com/alexcrichton/cc-rs/blob/fba7feded71ee4f63cfe885673ead6d7b4f2f454/src/lib.rs#L2347-L2365
814 fn get_var(var_base: &str, host: &str, target: &str) -> Option<OsString> {
815 let kind = if host == target { "HOST" } else { "TARGET" };
816 let target_u = target.replace("-", "_");
817 env::var_os(&format!("{}_{}", var_base, target))
818 .or_else(|| env::var_os(&format!("{}_{}", var_base, target_u)))
819 .or_else(|| env::var_os(&format!("{}_{}", kind, var_base)))
820 .or_else(|| env::var_os(var_base))
823 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
825 pub target: TargetSelection,
829 type Output = PathBuf;
830 const ONLY_HOSTS: bool = true;
832 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
833 run.path("src/llvm-project/lld")
836 fn make_run(run: RunConfig<'_>) {
837 run.builder.ensure(Lld { target: run.target });
840 /// Compile LLD for `target`.
841 fn run(self, builder: &Builder<'_>) -> PathBuf {
842 if builder.config.dry_run {
843 return PathBuf::from("lld-out-dir-test-gen");
845 let target = self.target;
847 let llvm_config = builder.ensure(Llvm { target: self.target });
849 let out_dir = builder.lld_out(target);
850 let done_stamp = out_dir.join("lld-finished-building");
851 if done_stamp.exists() {
855 builder.info(&format!("Building LLD for {}", target));
856 let _time = util::timeit(&builder);
857 t!(fs::create_dir_all(&out_dir));
859 let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
860 let mut ldflags = LdFlags::default();
862 // When building LLD as part of a build with instrumentation on windows, for example
863 // when doing PGO on CI, cmake or clang-cl don't automatically link clang's
864 // profiler runtime in. In that case, we need to manually ask cmake to do it, to avoid
865 // linking errors, much like LLVM's cmake setup does in that situation.
866 if builder.config.llvm_profile_generate && target.contains("msvc") {
867 if let Some(clang_cl_path) = builder.config.llvm_clang_cl.as_ref() {
868 // Find clang's runtime library directory and push that as a search path to the
869 // cmake linker flags.
870 let clang_rt_dir = get_clang_cl_resource_dir(clang_cl_path);
871 ldflags.push_all(&format!("/libpath:{}", clang_rt_dir.display()));
875 configure_cmake(builder, target, &mut cfg, true, ldflags);
876 configure_llvm(builder, target, &mut cfg);
878 // This is an awful, awful hack. Discovered when we migrated to using
879 // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
880 // tree, will execute `llvm-config --cmakedir` and then tell CMake about
881 // that directory for later processing. Unfortunately if this path has
882 // forward slashes in it (which it basically always does on Windows)
883 // then CMake will hit a syntax error later on as... something isn't
886 // Instead of attempting to fix this problem in upstream CMake and/or
887 // LLVM/LLD we just hack around it here. This thin wrapper will take the
888 // output from llvm-config and replace all instances of `\` with `/` to
889 // ensure we don't hit the same bugs with escaping. It means that you
890 // can't build on a system where your paths require `\` on Windows, but
891 // there's probably a lot of reasons you can't do that other than this.
892 let llvm_config_shim = env::current_exe().unwrap().with_file_name("llvm-config-wrapper");
894 // Re-use the same flags as llvm to control the level of debug information
895 // generated for lld.
896 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
897 (false, _) => "Debug",
898 (true, false) => "Release",
899 (true, true) => "RelWithDebInfo",
902 cfg.out_dir(&out_dir)
904 .env("LLVM_CONFIG_REAL", &llvm_config)
905 .define("LLVM_CONFIG_PATH", llvm_config_shim)
906 .define("LLVM_INCLUDE_TESTS", "OFF");
908 // While we're using this horrible workaround to shim the execution of
909 // llvm-config, let's just pile on more. I can't seem to figure out how
910 // to build LLD as a standalone project and also cross-compile it at the
911 // same time. It wants a natively executable `llvm-config` to learn
912 // about LLVM, but then it learns about all the host configuration of
913 // LLVM and tries to link to host LLVM libraries.
915 // To work around that we tell our shim to replace anything with the
916 // build target with the actual target instead. This'll break parts of
917 // LLD though which try to execute host tools, such as llvm-tblgen, so
918 // we specifically tell it where to find those. This is likely super
919 // brittle and will break over time. If anyone knows better how to
920 // cross-compile LLD it would be much appreciated to fix this!
921 if target != builder.config.build {
922 cfg.env("LLVM_CONFIG_SHIM_REPLACE", &builder.config.build.triple)
923 .env("LLVM_CONFIG_SHIM_REPLACE_WITH", &target.triple)
926 llvm_config.with_file_name("llvm-tblgen").with_extension(EXE_EXTENSION),
930 // Explicitly set C++ standard, because upstream doesn't do so
931 // for standalone builds.
932 cfg.define("CMAKE_CXX_STANDARD", "14");
936 t!(File::create(&done_stamp));
941 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
942 pub struct TestHelpers {
943 pub target: TargetSelection,
946 impl Step for TestHelpers {
949 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
950 run.path("src/test/auxiliary/rust_test_helpers.c")
953 fn make_run(run: RunConfig<'_>) {
954 run.builder.ensure(TestHelpers { target: run.target })
957 /// Compiles the `rust_test_helpers.c` library which we used in various
958 /// `run-pass` tests for ABI testing.
959 fn run(self, builder: &Builder<'_>) {
960 if builder.config.dry_run {
963 // The x86_64-fortanix-unknown-sgx target doesn't have a working C
964 // toolchain. However, some x86_64 ELF objects can be linked
965 // without issues. Use this hack to compile the test helpers.
966 let target = if self.target == "x86_64-fortanix-unknown-sgx" {
967 TargetSelection::from_user("x86_64-unknown-linux-gnu")
971 let dst = builder.test_helpers_out(target);
972 let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
973 if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
977 builder.info("Building test helpers");
978 t!(fs::create_dir_all(&dst));
979 let mut cfg = cc::Build::new();
980 // FIXME: Workaround for https://github.com/emscripten-core/emscripten/issues/9013
981 if target.contains("emscripten") {
985 // We may have found various cross-compilers a little differently due to our
986 // extra configuration, so inform cc of these compilers. Note, though, that
987 // on MSVC we still need cc's detection of env vars (ugh).
988 if !target.contains("msvc") {
989 if let Some(ar) = builder.ar(target) {
992 cfg.compiler(builder.cc(target));
994 cfg.cargo_metadata(false)
996 .target(&target.triple)
997 .host(&builder.config.build.triple)
1001 .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
1002 .compile("rust_test_helpers");
1006 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1007 pub struct Sanitizers {
1008 pub target: TargetSelection,
1011 impl Step for Sanitizers {
1012 type Output = Vec<SanitizerRuntime>;
1014 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1015 run.alias("sanitizers")
1018 fn make_run(run: RunConfig<'_>) {
1019 run.builder.ensure(Sanitizers { target: run.target });
1022 /// Builds sanitizer runtime libraries.
1023 fn run(self, builder: &Builder<'_>) -> Self::Output {
1024 let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
1025 if !compiler_rt_dir.exists() {
1029 let out_dir = builder.native_dir(self.target).join("sanitizers");
1030 let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
1031 if runtimes.is_empty() {
1035 let llvm_config = builder.ensure(Llvm { target: builder.config.build });
1036 if builder.config.dry_run {
1040 let stamp = out_dir.join("sanitizers-finished-building");
1041 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
1043 if stamp.is_done() {
1044 if stamp.hash.is_none() {
1045 builder.info(&format!(
1046 "Rebuild sanitizers by removing the file `{}`",
1047 stamp.path.display()
1053 builder.info(&format!("Building sanitizers for {}", self.target));
1055 let _time = util::timeit(&builder);
1057 let mut cfg = cmake::Config::new(&compiler_rt_dir);
1058 cfg.profile("Release");
1059 cfg.define("CMAKE_C_COMPILER_TARGET", self.target.triple);
1060 cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
1061 cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
1062 cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
1063 cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
1064 cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
1065 cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
1066 cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
1067 cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
1068 cfg.define("LLVM_CONFIG_PATH", &llvm_config);
1070 // On Darwin targets the sanitizer runtimes are build as universal binaries.
1071 // Unfortunately sccache currently lacks support to build them successfully.
1072 // Disable compiler launcher on Darwin targets to avoid potential issues.
1073 let use_compiler_launcher = !self.target.contains("apple-darwin");
1074 configure_cmake(builder, self.target, &mut cfg, use_compiler_launcher, LdFlags::default());
1076 t!(fs::create_dir_all(&out_dir));
1077 cfg.out_dir(out_dir);
1079 for runtime in &runtimes {
1080 cfg.build_target(&runtime.cmake_target);
1089 #[derive(Clone, Debug)]
1090 pub struct SanitizerRuntime {
1091 /// CMake target used to build the runtime.
1092 pub cmake_target: String,
1093 /// Path to the built runtime library.
1095 /// Library filename that will be used rustc.
1099 /// Returns sanitizers available on a given target.
1100 fn supported_sanitizers(
1102 target: TargetSelection,
1104 ) -> Vec<SanitizerRuntime> {
1105 let darwin_libs = |os: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
1108 .map(move |c| SanitizerRuntime {
1109 cmake_target: format!("clang_rt.{}_{}_dynamic", c, os),
1111 .join(&format!("build/lib/darwin/libclang_rt.{}_{}_dynamic.dylib", c, os)),
1112 name: format!("librustc-{}_rt.{}.dylib", channel, c),
1117 let common_libs = |os: &str, arch: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
1120 .map(move |c| SanitizerRuntime {
1121 cmake_target: format!("clang_rt.{}-{}", c, arch),
1122 path: out_dir.join(&format!("build/lib/{}/libclang_rt.{}-{}.a", os, c, arch)),
1123 name: format!("librustc-{}_rt.{}.a", channel, c),
1128 match &*target.triple {
1129 "aarch64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
1130 "aarch64-fuchsia" => common_libs("fuchsia", "aarch64", &["asan"]),
1131 "aarch64-unknown-linux-gnu" => {
1132 common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan", "hwasan"])
1134 "x86_64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
1135 "x86_64-fuchsia" => common_libs("fuchsia", "x86_64", &["asan"]),
1136 "x86_64-unknown-freebsd" => common_libs("freebsd", "x86_64", &["asan", "msan", "tsan"]),
1137 "x86_64-unknown-netbsd" => {
1138 common_libs("netbsd", "x86_64", &["asan", "lsan", "msan", "tsan"])
1140 "x86_64-unknown-illumos" => common_libs("illumos", "x86_64", &["asan"]),
1141 "x86_64-pc-solaris" => common_libs("solaris", "x86_64", &["asan"]),
1142 "x86_64-unknown-linux-gnu" => {
1143 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
1145 "x86_64-unknown-linux-musl" => {
1146 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
1154 hash: Option<Vec<u8>>,
1158 fn new(path: PathBuf, hash: Option<&str>) -> Self {
1159 HashStamp { path, hash: hash.map(|s| s.as_bytes().to_owned()) }
1162 fn is_done(&self) -> bool {
1163 match fs::read(&self.path) {
1164 Ok(h) => self.hash.as_deref().unwrap_or(b"") == h.as_slice(),
1165 Err(e) if e.kind() == io::ErrorKind::NotFound => false,
1167 panic!("failed to read stamp file `{}`: {}", self.path.display(), e);
1172 fn remove(&self) -> io::Result<()> {
1173 match fs::remove_file(&self.path) {
1176 if e.kind() == io::ErrorKind::NotFound {
1185 fn write(&self) -> io::Result<()> {
1186 fs::write(&self.path, self.hash.as_deref().unwrap_or(b""))
1190 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1191 pub struct CrtBeginEnd {
1192 pub target: TargetSelection,
1195 impl Step for CrtBeginEnd {
1196 type Output = PathBuf;
1198 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1199 run.path("src/llvm-project/compiler-rt/lib/crt")
1202 fn make_run(run: RunConfig<'_>) {
1203 run.builder.ensure(CrtBeginEnd { target: run.target });
1206 /// Build crtbegin.o/crtend.o for musl target.
1207 fn run(self, builder: &Builder<'_>) -> Self::Output {
1208 let out_dir = builder.native_dir(self.target).join("crt");
1210 if builder.config.dry_run {
1214 let crtbegin_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtbegin.c");
1215 let crtend_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtend.c");
1216 if up_to_date(&crtbegin_src, &out_dir.join("crtbegin.o"))
1217 && up_to_date(&crtend_src, &out_dir.join("crtendS.o"))
1222 builder.info("Building crtbegin.o and crtend.o");
1223 t!(fs::create_dir_all(&out_dir));
1225 let mut cfg = cc::Build::new();
1227 if let Some(ar) = builder.ar(self.target) {
1230 cfg.compiler(builder.cc(self.target));
1231 cfg.cargo_metadata(false)
1233 .target(&self.target.triple)
1234 .host(&builder.config.build.triple)
1241 // Those flags are defined in src/llvm-project/compiler-rt/lib/crt/CMakeLists.txt
1242 // Currently only consumer of those objects is musl, which use .init_array/.fini_array
1243 // instead of .ctors/.dtors
1244 cfg.flag("-std=c11")
1245 .define("CRT_HAS_INITFINI_ARRAY", None)
1246 .define("EH_USE_FRAME_REGISTRY", None);
1250 t!(fs::copy(out_dir.join("crtbegin.o"), out_dir.join("crtbeginS.o")));
1251 t!(fs::copy(out_dir.join("crtend.o"), out_dir.join("crtendS.o")));
1256 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1257 pub struct Libunwind {
1258 pub target: TargetSelection,
1261 impl Step for Libunwind {
1262 type Output = PathBuf;
1264 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1265 run.path("src/llvm-project/libunwind")
1268 fn make_run(run: RunConfig<'_>) {
1269 run.builder.ensure(Libunwind { target: run.target });
1272 /// Build linunwind.a
1273 fn run(self, builder: &Builder<'_>) -> Self::Output {
1274 if builder.config.dry_run {
1275 return PathBuf::new();
1278 let out_dir = builder.native_dir(self.target).join("libunwind");
1279 let root = builder.src.join("src/llvm-project/libunwind");
1281 if up_to_date(&root, &out_dir.join("libunwind.a")) {
1285 builder.info(&format!("Building libunwind.a for {}", self.target.triple));
1286 t!(fs::create_dir_all(&out_dir));
1288 let mut cc_cfg = cc::Build::new();
1289 let mut cpp_cfg = cc::Build::new();
1292 cpp_cfg.cpp_set_stdlib(None);
1293 cpp_cfg.flag("-nostdinc++");
1294 cpp_cfg.flag("-fno-exceptions");
1295 cpp_cfg.flag("-fno-rtti");
1296 cpp_cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
1298 for cfg in [&mut cc_cfg, &mut cpp_cfg].iter_mut() {
1299 if let Some(ar) = builder.ar(self.target) {
1302 cfg.target(&self.target.triple);
1303 cfg.host(&builder.config.build.triple);
1304 cfg.warnings(false);
1306 // get_compiler() need set opt_level first.
1308 cfg.flag("-fstrict-aliasing");
1309 cfg.flag("-funwind-tables");
1310 cfg.flag("-fvisibility=hidden");
1311 cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
1312 cfg.include(root.join("include"));
1313 cfg.cargo_metadata(false);
1314 cfg.out_dir(&out_dir);
1316 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1317 cfg.static_flag(true);
1318 cfg.flag("-fno-stack-protector");
1319 cfg.flag("-ffreestanding");
1320 cfg.flag("-fexceptions");
1322 // easiest way to undefine since no API available in cc::Build to undefine
1323 cfg.flag("-U_FORTIFY_SOURCE");
1324 cfg.define("_FORTIFY_SOURCE", "0");
1325 cfg.define("RUST_SGX", "1");
1326 cfg.define("__NO_STRING_INLINES", None);
1327 cfg.define("__NO_MATH_INLINES", None);
1328 cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
1329 cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
1330 cfg.define("NDEBUG", None);
1332 if self.target.contains("windows") {
1333 cfg.define("_LIBUNWIND_HIDE_SYMBOLS", "1");
1334 cfg.define("_LIBUNWIND_IS_NATIVE_ONLY", "1");
1338 cc_cfg.compiler(builder.cc(self.target));
1339 if let Ok(cxx) = builder.cxx(self.target) {
1340 cpp_cfg.compiler(cxx);
1342 cc_cfg.compiler(builder.cc(self.target));
1345 // Don't set this for clang
1346 // By default, Clang builds C code in GNU C17 mode.
1347 // By default, Clang builds C++ code according to the C++98 standard,
1348 // with many C++11 features accepted as extensions.
1349 if cc_cfg.get_compiler().is_like_gnu() {
1350 cc_cfg.flag("-std=c99");
1352 if cpp_cfg.get_compiler().is_like_gnu() {
1353 cpp_cfg.flag("-std=c++11");
1356 if self.target.contains("x86_64-fortanix-unknown-sgx") || self.target.contains("musl") {
1357 // use the same GCC C compiler command to compile C++ code so we do not need to setup the
1358 // C++ compiler env variables on the builders.
1359 // Don't set this for clang++, as clang++ is able to compile this without libc++.
1360 if cpp_cfg.get_compiler().is_like_gnu() {
1362 cpp_cfg.compiler(builder.cc(self.target));
1366 let mut c_sources = vec![
1368 "UnwindLevel1-gcc-ext.c",
1370 "UnwindRegistersRestore.S",
1371 "UnwindRegistersSave.S",
1374 let cpp_sources = vec!["Unwind-EHABI.cpp", "Unwind-seh.cpp", "libunwind.cpp"];
1375 let cpp_len = cpp_sources.len();
1377 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1378 c_sources.push("UnwindRustSgx.c");
1381 for src in c_sources {
1382 cc_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1385 for src in &cpp_sources {
1386 cpp_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1389 cpp_cfg.compile("unwind-cpp");
1391 // FIXME: https://github.com/alexcrichton/cc-rs/issues/545#issuecomment-679242845
1393 for entry in fs::read_dir(&out_dir).unwrap() {
1394 let file = entry.unwrap().path().canonicalize().unwrap();
1395 if file.is_file() && file.extension() == Some(OsStr::new("o")) {
1396 // file name starts with "Unwind-EHABI", "Unwind-seh" or "libunwind"
1397 let file_name = file.file_name().unwrap().to_str().expect("UTF-8 file name");
1398 if cpp_sources.iter().any(|f| file_name.starts_with(&f[..f.len() - 4])) {
1399 cc_cfg.object(&file);
1404 assert_eq!(cpp_len, count, "Can't get object files from {:?}", &out_dir);
1406 cc_cfg.compile("unwind");