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::bolt::{instrument_with_bolt_inplace, optimize_library_with_bolt_inplace};
20 use crate::builder::{Builder, RunConfig, ShouldRun, Step};
22 use crate::config::TargetSelection;
23 use crate::util::get_clang_cl_resource_dir;
24 use crate::util::{self, exe, output, program_out_of_date, t, up_to_date};
25 use crate::{CLang, GitRepo};
29 build_llvm_config: PathBuf,
34 // Linker flags to pass to LLVM's CMake invocation.
35 #[derive(Debug, Clone, Default)]
37 // CMAKE_EXE_LINKER_FLAGS
39 // CMAKE_SHARED_LINKER_FLAGS
41 // CMAKE_MODULE_LINKER_FLAGS
46 fn push_all(&mut self, s: impl AsRef<OsStr>) {
50 self.shared.push(" ");
52 self.module.push(" ");
57 // This returns whether we've already previously built LLVM.
59 // It's used to avoid busting caches during x.py check -- if we've already built
60 // LLVM, it's fine for us to not try to avoid doing so.
62 // This will return the llvm-config if it can get it (but it will not build it
64 pub fn prebuilt_llvm_config(
65 builder: &Builder<'_>,
66 target: TargetSelection,
67 ) -> Result<PathBuf, Meta> {
68 maybe_download_ci_llvm(builder);
70 // If we're using a custom LLVM bail out here, but we can only use a
71 // custom LLVM for the build triple.
72 if let Some(config) = builder.config.target_config.get(&target) {
73 if let Some(ref s) = config.llvm_config {
74 check_llvm_version(builder, s);
75 return Ok(s.to_path_buf());
79 let root = "src/llvm-project/llvm";
80 let out_dir = builder.llvm_out(target);
82 let mut llvm_config_ret_dir = builder.llvm_out(builder.config.build);
83 if !builder.config.build.contains("msvc") || builder.ninja() {
84 llvm_config_ret_dir.push("build");
86 llvm_config_ret_dir.push("bin");
88 let build_llvm_config = llvm_config_ret_dir.join(exe("llvm-config", builder.config.build));
90 let stamp = out_dir.join("llvm-finished-building");
91 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
93 if builder.config.llvm_skip_rebuild && stamp.path.exists() {
96 Using a potentially stale build of LLVM; \
97 This may not behave well.",
99 return Ok(build_llvm_config);
103 if stamp.hash.is_none() {
105 "Could not determine the LLVM submodule commit hash. \
106 Assuming that an LLVM rebuild is not necessary.",
108 builder.info(&format!(
109 "To force LLVM to rebuild, remove the file `{}`",
113 return Ok(build_llvm_config);
116 Err(Meta { stamp, build_llvm_config, out_dir, root: root.into() })
119 /// This retrieves the LLVM sha we *want* to use, according to git history.
120 pub(crate) fn detect_llvm_sha(config: &crate::config::Config, is_git: bool) -> String {
121 let llvm_sha = if is_git {
122 let mut rev_list = config.git();
124 PathBuf::from("rev-list"),
125 format!("--author={}", config.stage0_metadata.config.git_merge_commit_email).into(),
127 "--first-parent".into(),
130 config.src.join("src/llvm-project"),
131 config.src.join("src/bootstrap/download-ci-llvm-stamp"),
132 // the LLVM shared object file is named `LLVM-12-rust-{version}-nightly`
133 config.src.join("src/version"),
135 output(&mut rev_list).trim().to_owned()
136 } else if let Some(info) = channel::read_commit_info_file(&config.src) {
137 info.sha.trim().to_owned()
143 eprintln!("error: could not find commit hash for downloading LLVM");
144 eprintln!("help: maybe your repository history is too shallow?");
145 eprintln!("help: consider disabling `download-ci-llvm`");
146 eprintln!("help: or fetch enough history to include one upstream commit");
153 /// Returns whether the CI-found LLVM is currently usable.
155 /// This checks both the build triple platform to confirm we're usable at all,
156 /// and then verifies if the current HEAD matches the detected LLVM SHA head,
157 /// in which case LLVM is indicated as not available.
158 pub(crate) fn is_ci_llvm_available(config: &crate::config::Config, asserts: bool) -> bool {
159 // This is currently all tier 1 targets and tier 2 targets with host tools
160 // (since others may not have CI artifacts)
161 // https://doc.rust-lang.org/rustc/platform-support.html#tier-1
162 let supported_platforms = [
164 "aarch64-unknown-linux-gnu",
165 "i686-pc-windows-gnu",
166 "i686-pc-windows-msvc",
167 "i686-unknown-linux-gnu",
168 "x86_64-unknown-linux-gnu",
169 "x86_64-apple-darwin",
170 "x86_64-pc-windows-gnu",
171 "x86_64-pc-windows-msvc",
172 // tier 2 with host tools
173 "aarch64-apple-darwin",
174 "aarch64-pc-windows-msvc",
175 "aarch64-unknown-linux-musl",
176 "arm-unknown-linux-gnueabi",
177 "arm-unknown-linux-gnueabihf",
178 "armv7-unknown-linux-gnueabihf",
179 "mips-unknown-linux-gnu",
180 "mips64-unknown-linux-gnuabi64",
181 "mips64el-unknown-linux-gnuabi64",
182 "mipsel-unknown-linux-gnu",
183 "powerpc-unknown-linux-gnu",
184 "powerpc64-unknown-linux-gnu",
185 "powerpc64le-unknown-linux-gnu",
186 "riscv64gc-unknown-linux-gnu",
187 "s390x-unknown-linux-gnu",
188 "x86_64-unknown-freebsd",
189 "x86_64-unknown-illumos",
190 "x86_64-unknown-linux-musl",
191 "x86_64-unknown-netbsd",
193 if !supported_platforms.contains(&&*config.build.triple) {
197 let triple = &*config.build.triple;
198 if (triple == "aarch64-unknown-linux-gnu" || triple.contains("i686")) && asserts {
199 // No alt builder for aarch64-unknown-linux-gnu today.
203 if crate::util::CiEnv::is_ci() {
204 // We assume we have access to git, so it's okay to unconditionally pass
206 let llvm_sha = detect_llvm_sha(config, true);
207 let head_sha = output(config.git().arg("rev-parse").arg("HEAD"));
208 let head_sha = head_sha.trim();
209 if llvm_sha == head_sha {
211 "Detected LLVM as non-available: running in CI and modified LLVM in this change"
220 pub(crate) fn maybe_download_ci_llvm(builder: &Builder<'_>) {
221 let config = &builder.config;
222 if !config.llvm_from_ci {
225 let llvm_root = config.ci_llvm_root();
226 let llvm_stamp = llvm_root.join(".llvm-stamp");
227 let llvm_sha = detect_llvm_sha(&config, builder.rust_info.is_managed_git_subrepository());
228 let key = format!("{}{}", llvm_sha, config.llvm_assertions);
229 if program_out_of_date(&llvm_stamp, &key) && !config.dry_run {
230 download_ci_llvm(builder, &llvm_sha);
231 for entry in t!(fs::read_dir(llvm_root.join("bin"))) {
232 builder.fix_bin_or_dylib(&t!(entry).path());
235 // Update the timestamp of llvm-config to force rustc_llvm to be
236 // rebuilt. This is a hacky workaround for a deficiency in Cargo where
237 // the rerun-if-changed directive doesn't handle changes very well.
238 // https://github.com/rust-lang/cargo/issues/10791
239 // Cargo only compares the timestamp of the file relative to the last
240 // time `rustc_llvm` build script ran. However, the timestamps of the
241 // files in the tarball are in the past, so it doesn't trigger a
243 let now = filetime::FileTime::from_system_time(std::time::SystemTime::now());
244 let llvm_config = llvm_root.join("bin").join(exe("llvm-config", builder.config.build));
245 t!(filetime::set_file_times(&llvm_config, now, now));
247 let llvm_lib = llvm_root.join("lib");
248 for entry in t!(fs::read_dir(&llvm_lib)) {
249 let lib = t!(entry).path();
250 if lib.extension().map_or(false, |ext| ext == "so") {
251 builder.fix_bin_or_dylib(&lib);
254 t!(fs::write(llvm_stamp, key));
258 fn download_ci_llvm(builder: &Builder<'_>, llvm_sha: &str) {
259 let llvm_assertions = builder.config.llvm_assertions;
261 let cache_prefix = format!("llvm-{}-{}", llvm_sha, llvm_assertions);
262 let cache_dst = builder.out.join("cache");
263 let rustc_cache = cache_dst.join(cache_prefix);
264 if !rustc_cache.exists() {
265 t!(fs::create_dir_all(&rustc_cache));
267 let base = if llvm_assertions {
268 &builder.config.stage0_metadata.config.artifacts_with_llvm_assertions_server
270 &builder.config.stage0_metadata.config.artifacts_server
272 let channel = builder.config.artifact_channel(builder, llvm_sha);
273 let filename = format!("rust-dev-{}-{}.tar.xz", channel, builder.build.build.triple);
274 let tarball = rustc_cache.join(&filename);
275 if !tarball.exists() {
276 let help_on_error = "error: failed to download llvm from ci
278 help: old builds get deleted after a certain time
279 help: if trying to compile an old commit of rustc, disable `download-ci-llvm` in config.toml:
282 download-ci-llvm = false
284 builder.download_component(
285 &format!("{base}/{llvm_sha}/{filename}"),
290 let llvm_root = builder.config.ci_llvm_root();
291 builder.unpack(&tarball, &llvm_root, "rust-dev");
294 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
296 pub target: TargetSelection,
300 type Output = PathBuf; // path to llvm-config
302 const ONLY_HOSTS: bool = true;
304 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
305 run.path("src/llvm-project").path("src/llvm-project/llvm")
308 fn make_run(run: RunConfig<'_>) {
309 run.builder.ensure(Llvm { target: run.target });
312 /// Compile LLVM for `target`.
313 fn run(self, builder: &Builder<'_>) -> PathBuf {
314 let target = self.target;
315 let target_native = if self.target.starts_with("riscv") {
316 // RISC-V target triples in Rust is not named the same as C compiler target triples.
317 // This converts Rust RISC-V target triples to C compiler triples.
318 let idx = target.triple.find('-').unwrap();
320 format!("riscv{}{}", &target.triple[5..7], &target.triple[idx..])
321 } else if self.target.starts_with("powerpc") && self.target.ends_with("freebsd") {
322 // FreeBSD 13 had incompatible ABI changes on all PowerPC platforms.
323 // Set the version suffix to 13.0 so the correct target details are used.
324 format!("{}{}", self.target, "13.0")
329 let Meta { stamp, build_llvm_config, out_dir, root } =
330 match prebuilt_llvm_config(builder, target) {
335 builder.update_submodule(&Path::new("src").join("llvm-project"));
336 if builder.llvm_link_shared() && target.contains("windows") {
337 panic!("shared linking to LLVM is not currently supported on {}", target.triple);
340 builder.info(&format!("Building LLVM for {}", target));
342 let _time = util::timeit(&builder);
343 t!(fs::create_dir_all(&out_dir));
345 // https://llvm.org/docs/CMake.html
346 let mut cfg = cmake::Config::new(builder.src.join(root));
347 let mut ldflags = LdFlags::default();
349 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
350 (false, _) => "Debug",
351 (true, false) => "Release",
352 (true, true) => "RelWithDebInfo",
355 // NOTE: remember to also update `config.toml.example` when changing the
357 let llvm_targets = match &builder.config.llvm_targets {
360 "AArch64;ARM;BPF;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;\
361 Sparc;SystemZ;WebAssembly;X86"
365 let llvm_exp_targets = match builder.config.llvm_experimental_targets {
370 let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
371 let plugins = if builder.config.llvm_plugins { "ON" } else { "OFF" };
372 let enable_tests = if builder.config.llvm_tests { "ON" } else { "OFF" };
374 cfg.out_dir(&out_dir)
376 .define("LLVM_ENABLE_ASSERTIONS", assertions)
377 .define("LLVM_ENABLE_PLUGINS", plugins)
378 .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
379 .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
380 .define("LLVM_INCLUDE_EXAMPLES", "OFF")
381 .define("LLVM_INCLUDE_DOCS", "OFF")
382 .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
383 .define("LLVM_INCLUDE_TESTS", enable_tests)
384 .define("LLVM_ENABLE_TERMINFO", "OFF")
385 .define("LLVM_ENABLE_LIBEDIT", "OFF")
386 .define("LLVM_ENABLE_BINDINGS", "OFF")
387 .define("LLVM_ENABLE_Z3_SOLVER", "OFF")
388 .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
389 .define("LLVM_TARGET_ARCH", target_native.split('-').next().unwrap())
390 .define("LLVM_DEFAULT_TARGET_TRIPLE", target_native);
392 // Parts of our test suite rely on the `FileCheck` tool, which is built by default in
393 // `build/$TARGET/llvm/build/bin` is but *not* then installed to `build/$TARGET/llvm/bin`.
394 // This flag makes sure `FileCheck` is copied in the final binaries directory.
395 cfg.define("LLVM_INSTALL_UTILS", "ON");
397 if builder.config.llvm_profile_generate {
398 cfg.define("LLVM_BUILD_INSTRUMENTED", "IR");
399 if let Ok(llvm_profile_dir) = std::env::var("LLVM_PROFILE_DIR") {
400 cfg.define("LLVM_PROFILE_DATA_DIR", llvm_profile_dir);
402 cfg.define("LLVM_BUILD_RUNTIME", "No");
404 if let Some(path) = builder.config.llvm_profile_use.as_ref() {
405 cfg.define("LLVM_PROFDATA_FILE", &path);
407 if builder.config.llvm_bolt_profile_generate
408 || builder.config.llvm_bolt_profile_use.is_some()
410 // Relocations are required for BOLT to work.
411 ldflags.push_all("-Wl,-q");
414 // Disable zstd to avoid a dependency on libzstd.so.
415 cfg.define("LLVM_ENABLE_ZSTD", "OFF");
417 if target != "aarch64-apple-darwin" && !target.contains("windows") {
418 cfg.define("LLVM_ENABLE_ZLIB", "ON");
420 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
423 // Are we compiling for iOS/tvOS/watchOS?
424 if target.contains("apple-ios")
425 || target.contains("apple-tvos")
426 || target.contains("apple-watchos")
428 // These two defines prevent CMake from automatically trying to add a MacOSX sysroot, which leads to a compiler error.
429 cfg.define("CMAKE_OSX_SYSROOT", "/");
430 cfg.define("CMAKE_OSX_DEPLOYMENT_TARGET", "");
431 // Prevent cmake from adding -bundle to CFLAGS automatically, which leads to a compiler error because "-bitcode_bundle" also gets added.
432 cfg.define("LLVM_ENABLE_PLUGINS", "OFF");
433 // Zlib fails to link properly, leading to a compiler error.
434 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
437 // This setting makes the LLVM tools link to the dynamic LLVM library,
438 // which saves both memory during parallel links and overall disk space
439 // for the tools. We don't do this on every platform as it doesn't work
440 // equally well everywhere.
441 if builder.llvm_link_shared() {
442 cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
445 if target.starts_with("riscv") && !target.contains("freebsd") && !target.contains("openbsd")
447 // RISC-V GCC erroneously requires linking against
448 // `libatomic` when using 1-byte and 2-byte C++
449 // atomics but the LLVM build system check cannot
450 // detect this. Therefore it is set manually here.
451 // Some BSD uses Clang as its system compiler and
452 // provides no libatomic in its base system so does
454 ldflags.exe.push(" -latomic");
455 ldflags.shared.push(" -latomic");
458 if target.contains("msvc") {
459 cfg.define("LLVM_USE_CRT_DEBUG", "MT");
460 cfg.define("LLVM_USE_CRT_RELEASE", "MT");
461 cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
462 cfg.static_crt(true);
465 if target.starts_with("i686") {
466 cfg.define("LLVM_BUILD_32_BITS", "ON");
469 let mut enabled_llvm_projects = Vec::new();
471 if util::forcing_clang_based_tests() {
472 enabled_llvm_projects.push("clang");
473 enabled_llvm_projects.push("compiler-rt");
476 if builder.config.llvm_polly {
477 enabled_llvm_projects.push("polly");
480 if builder.config.llvm_clang {
481 enabled_llvm_projects.push("clang");
484 // We want libxml to be disabled.
485 // See https://github.com/rust-lang/rust/pull/50104
486 cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
488 if !enabled_llvm_projects.is_empty() {
489 enabled_llvm_projects.sort();
490 enabled_llvm_projects.dedup();
491 cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
494 if let Some(num_linkers) = builder.config.llvm_link_jobs {
496 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
500 // Workaround for ppc32 lld limitation
501 if target == "powerpc-unknown-freebsd" {
502 ldflags.exe.push(" -fuse-ld=bfd");
505 // https://llvm.org/docs/HowToCrossCompileLLVM.html
506 if target != builder.config.build {
507 let llvm_config = builder.ensure(Llvm { target: builder.config.build });
508 if !builder.config.dry_run {
509 let llvm_bindir = output(Command::new(&llvm_config).arg("--bindir"));
510 let host_bin = Path::new(llvm_bindir.trim());
513 host_bin.join("llvm-tblgen").with_extension(EXE_EXTENSION),
515 // LLVM_NM is required for cross compiling using MSVC
516 cfg.define("LLVM_NM", host_bin.join("llvm-nm").with_extension(EXE_EXTENSION));
518 cfg.define("LLVM_CONFIG_PATH", llvm_config);
519 if builder.config.llvm_clang {
520 let build_bin = builder.llvm_out(builder.config.build).join("build").join("bin");
521 let clang_tblgen = build_bin.join("clang-tblgen").with_extension(EXE_EXTENSION);
522 if !builder.config.dry_run && !clang_tblgen.exists() {
523 panic!("unable to find {}", clang_tblgen.display());
525 cfg.define("CLANG_TABLEGEN", clang_tblgen);
529 let llvm_version_suffix = if let Some(ref suffix) = builder.config.llvm_version_suffix {
530 // Allow version-suffix="" to not define a version suffix at all.
531 if !suffix.is_empty() { Some(suffix.to_string()) } else { None }
532 } else if builder.config.channel == "dev" {
533 // Changes to a version suffix require a complete rebuild of the LLVM.
534 // To avoid rebuilds during a time of version bump, don't include rustc
535 // release number on the dev channel.
536 Some("-rust-dev".to_string())
538 Some(format!("-rust-{}-{}", builder.version, builder.config.channel))
540 if let Some(ref suffix) = llvm_version_suffix {
541 cfg.define("LLVM_VERSION_SUFFIX", suffix);
544 configure_cmake(builder, target, &mut cfg, true, ldflags);
545 configure_llvm(builder, target, &mut cfg);
547 for (key, val) in &builder.config.llvm_build_config {
548 cfg.define(key, val);
551 // FIXME: we don't actually need to build all LLVM tools and all LLVM
552 // libraries here, e.g., we just want a few components and a few
553 // tools. Figure out how to filter them down and only build the right
554 // tools and libs on all platforms.
556 if builder.config.dry_run {
557 return build_llvm_config;
562 // When building LLVM with LLVM_LINK_LLVM_DYLIB for macOS, an unversioned
563 // libLLVM.dylib will be built. However, llvm-config will still look
564 // for a versioned path like libLLVM-14.dylib. Manually create a symbolic
565 // link to make llvm-config happy.
566 if builder.llvm_link_shared() && target.contains("apple-darwin") {
567 let mut cmd = Command::new(&build_llvm_config);
568 let version = output(cmd.arg("--version"));
569 let major = version.split('.').next().unwrap();
570 let lib_name = match llvm_version_suffix {
571 Some(s) => format!("libLLVM-{}{}.dylib", major, s),
572 None => format!("libLLVM-{}.dylib", major),
575 let lib_llvm = out_dir.join("build").join("lib").join(lib_name);
576 if !lib_llvm.exists() {
577 t!(builder.symlink_file("libLLVM.dylib", &lib_llvm));
581 // After LLVM is built, we modify (instrument or optimize) the libLLVM.so library file
582 // in place. This is fine, because currently we do not support incrementally rebuilding
583 // LLVM after a configuration change, so to rebuild it the build files have to be removed,
584 // which will also remove these modified files.
585 if builder.config.llvm_bolt_profile_generate {
586 instrument_with_bolt_inplace(&get_built_llvm_lib_path(&build_llvm_config));
588 if let Some(path) = &builder.config.llvm_bolt_profile_use {
589 optimize_library_with_bolt_inplace(
590 &get_built_llvm_lib_path(&build_llvm_config),
601 /// Returns path to a built LLVM library (libLLVM.so).
602 /// Assumes that we have built LLVM into a single library file.
603 fn get_built_llvm_lib_path(llvm_config_path: &Path) -> PathBuf {
604 let mut cmd = Command::new(llvm_config_path);
605 cmd.arg("--libfiles");
606 PathBuf::from(output(&mut cmd).trim())
609 fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
610 if !builder.config.llvm_version_check {
614 if builder.config.dry_run {
618 let mut cmd = Command::new(llvm_config);
619 let version = output(cmd.arg("--version"));
620 let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
621 if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
626 panic!("\n\nbad LLVM version: {}, need >=13.0\n\n", version)
630 builder: &Builder<'_>,
631 target: TargetSelection,
632 cfg: &mut cmake::Config,
633 use_compiler_launcher: bool,
634 mut ldflags: LdFlags,
636 // Do not print installation messages for up-to-date files.
637 // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
638 cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
640 // Do not allow the user's value of DESTDIR to influence where
641 // LLVM will install itself. LLVM must always be installed in our
642 // own build directories.
643 cfg.env("DESTDIR", "");
646 cfg.generator("Ninja");
648 cfg.target(&target.triple).host(&builder.config.build.triple);
650 if target != builder.config.build {
651 cfg.define("CMAKE_CROSSCOMPILING", "True");
653 if target.contains("netbsd") {
654 cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
655 } else if target.contains("freebsd") {
656 cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
657 } else if target.contains("windows") {
658 cfg.define("CMAKE_SYSTEM_NAME", "Windows");
659 } else if target.contains("haiku") {
660 cfg.define("CMAKE_SYSTEM_NAME", "Haiku");
661 } else if target.contains("solaris") || target.contains("illumos") {
662 cfg.define("CMAKE_SYSTEM_NAME", "SunOS");
664 // When cross-compiling we should also set CMAKE_SYSTEM_VERSION, but in
665 // that case like CMake we cannot easily determine system version either.
667 // Since, the LLVM itself makes rather limited use of version checks in
668 // CMakeFiles (and then only in tests), and so far no issues have been
669 // reported, the system version is currently left unset.
671 if target.contains("darwin") {
672 // Make sure that CMake does not build universal binaries on macOS.
673 // Explicitly specify the one single target architecture.
674 if target.starts_with("aarch64") {
675 // macOS uses a different name for building arm64
676 cfg.define("CMAKE_OSX_ARCHITECTURES", "arm64");
678 cfg.define("CMAKE_OSX_ARCHITECTURES", target.triple.split('-').next().unwrap());
683 let sanitize_cc = |cc: &Path| {
684 if target.contains("msvc") {
685 OsString::from(cc.to_str().unwrap().replace("\\", "/"))
687 cc.as_os_str().to_owned()
691 // MSVC with CMake uses msbuild by default which doesn't respect these
692 // vars that we'd otherwise configure. In that case we just skip this
694 if target.contains("msvc") && !builder.ninja() {
698 let (cc, cxx) = match builder.config.llvm_clang_cl {
699 Some(ref cl) => (cl.as_ref(), cl.as_ref()),
700 None => (builder.cc(target), builder.cxx(target).unwrap()),
703 // Handle msvc + ninja + ccache specially (this is what the bots use)
704 if target.contains("msvc") && builder.ninja() && builder.config.ccache.is_some() {
705 let mut wrap_cc = env::current_exe().expect("failed to get cwd");
706 wrap_cc.set_file_name("sccache-plus-cl.exe");
708 cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
709 .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
710 cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
711 .env("SCCACHE_TARGET", target.triple)
712 .env("SCCACHE_CC", &cc)
713 .env("SCCACHE_CXX", &cxx);
715 // Building LLVM on MSVC can be a little ludicrous at times. We're so far
716 // off the beaten path here that I'm not really sure this is even half
717 // supported any more. Here we're trying to:
719 // * Build LLVM on MSVC
720 // * Build LLVM with `clang-cl` instead of `cl.exe`
721 // * Build a project with `sccache`
722 // * Build for 32-bit as well
723 // * Build with Ninja
725 // For `cl.exe` there are different binaries to compile 32/64 bit which
726 // we use but for `clang-cl` there's only one which internally
727 // multiplexes via flags. As a result it appears that CMake's detection
728 // of a compiler's architecture and such on MSVC **doesn't** pass any
729 // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
730 // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
731 // definitely causes problems since all the env vars are pointing to
734 // To hack around this... again... we pass an argument that's
735 // unconditionally passed in the sccache shim. This'll get CMake to
736 // correctly diagnose it's doing a 32-bit compilation and LLVM will
737 // internally configure itself appropriately.
738 if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
739 cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
742 // If ccache is configured we inform the build a little differently how
743 // to invoke ccache while also invoking our compilers.
744 if use_compiler_launcher {
745 if let Some(ref ccache) = builder.config.ccache {
746 cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
747 .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
750 cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
751 .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx))
752 .define("CMAKE_ASM_COMPILER", sanitize_cc(cc));
755 cfg.build_arg("-j").build_arg(builder.jobs().to_string());
756 let mut cflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::C).join(" ").into();
757 if let Some(ref s) = builder.config.llvm_cflags {
761 // Some compiler features used by LLVM (such as thread locals) will not work on a min version below iOS 10.
762 if target.contains("apple-ios") {
763 if target.contains("86-") {
764 cflags.push(" -miphonesimulator-version-min=10.0");
766 cflags.push(" -miphoneos-version-min=10.0");
769 if builder.config.llvm_clang_cl.is_some() {
770 cflags.push(&format!(" --target={}", target));
772 cfg.define("CMAKE_C_FLAGS", cflags);
773 let mut cxxflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::Cxx).join(" ").into();
774 if let Some(ref s) = builder.config.llvm_cxxflags {
778 if builder.config.llvm_clang_cl.is_some() {
779 cxxflags.push(&format!(" --target={}", target));
781 cfg.define("CMAKE_CXX_FLAGS", cxxflags);
782 if let Some(ar) = builder.ar(target) {
783 if ar.is_absolute() {
784 // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
785 // tries to resolve this path in the LLVM build directory.
786 cfg.define("CMAKE_AR", sanitize_cc(ar));
790 if let Some(ranlib) = builder.ranlib(target) {
791 if ranlib.is_absolute() {
792 // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
793 // tries to resolve this path in the LLVM build directory.
794 cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
798 if let Some(ref flags) = builder.config.llvm_ldflags {
799 ldflags.push_all(flags);
802 if let Some(flags) = get_var("LDFLAGS", &builder.config.build.triple, &target.triple) {
803 ldflags.push_all(&flags);
806 // For distribution we want the LLVM tools to be *statically* linked to libstdc++.
807 // We also do this if the user explicitly requested static libstdc++.
808 if builder.config.llvm_static_stdcpp {
809 if !target.contains("msvc") && !target.contains("netbsd") && !target.contains("solaris") {
810 if target.contains("apple") || target.contains("windows") {
811 ldflags.push_all("-static-libstdc++");
813 ldflags.push_all("-Wl,-Bsymbolic -static-libstdc++");
818 cfg.define("CMAKE_SHARED_LINKER_FLAGS", &ldflags.shared);
819 cfg.define("CMAKE_MODULE_LINKER_FLAGS", &ldflags.module);
820 cfg.define("CMAKE_EXE_LINKER_FLAGS", &ldflags.exe);
822 if env::var_os("SCCACHE_ERROR_LOG").is_some() {
823 cfg.env("RUSTC_LOG", "sccache=warn");
827 fn configure_llvm(builder: &Builder<'_>, target: TargetSelection, cfg: &mut cmake::Config) {
828 // ThinLTO is only available when building with LLVM, enabling LLD is required.
829 // Apple's linker ld64 supports ThinLTO out of the box though, so don't use LLD on Darwin.
830 if builder.config.llvm_thin_lto {
831 cfg.define("LLVM_ENABLE_LTO", "Thin");
832 if !target.contains("apple") {
833 cfg.define("LLVM_ENABLE_LLD", "ON");
837 if let Some(ref linker) = builder.config.llvm_use_linker {
838 cfg.define("LLVM_USE_LINKER", linker);
841 if builder.config.llvm_allow_old_toolchain {
842 cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
846 // Adapted from https://github.com/alexcrichton/cc-rs/blob/fba7feded71ee4f63cfe885673ead6d7b4f2f454/src/lib.rs#L2347-L2365
847 fn get_var(var_base: &str, host: &str, target: &str) -> Option<OsString> {
848 let kind = if host == target { "HOST" } else { "TARGET" };
849 let target_u = target.replace("-", "_");
850 env::var_os(&format!("{}_{}", var_base, target))
851 .or_else(|| env::var_os(&format!("{}_{}", var_base, target_u)))
852 .or_else(|| env::var_os(&format!("{}_{}", kind, var_base)))
853 .or_else(|| env::var_os(var_base))
856 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
858 pub target: TargetSelection,
862 type Output = PathBuf;
863 const ONLY_HOSTS: bool = true;
865 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
866 run.path("src/llvm-project/lld")
869 fn make_run(run: RunConfig<'_>) {
870 run.builder.ensure(Lld { target: run.target });
873 /// Compile LLD for `target`.
874 fn run(self, builder: &Builder<'_>) -> PathBuf {
875 if builder.config.dry_run {
876 return PathBuf::from("lld-out-dir-test-gen");
878 let target = self.target;
880 let llvm_config = builder.ensure(Llvm { target: self.target });
882 let out_dir = builder.lld_out(target);
883 let done_stamp = out_dir.join("lld-finished-building");
884 if done_stamp.exists() {
888 builder.info(&format!("Building LLD for {}", target));
889 let _time = util::timeit(&builder);
890 t!(fs::create_dir_all(&out_dir));
892 let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
893 let mut ldflags = LdFlags::default();
895 // When building LLD as part of a build with instrumentation on windows, for example
896 // when doing PGO on CI, cmake or clang-cl don't automatically link clang's
897 // profiler runtime in. In that case, we need to manually ask cmake to do it, to avoid
898 // linking errors, much like LLVM's cmake setup does in that situation.
899 if builder.config.llvm_profile_generate && target.contains("msvc") {
900 if let Some(clang_cl_path) = builder.config.llvm_clang_cl.as_ref() {
901 // Find clang's runtime library directory and push that as a search path to the
902 // cmake linker flags.
903 let clang_rt_dir = get_clang_cl_resource_dir(clang_cl_path);
904 ldflags.push_all(&format!("/libpath:{}", clang_rt_dir.display()));
908 configure_cmake(builder, target, &mut cfg, true, ldflags);
909 configure_llvm(builder, target, &mut cfg);
911 // This is an awful, awful hack. Discovered when we migrated to using
912 // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
913 // tree, will execute `llvm-config --cmakedir` and then tell CMake about
914 // that directory for later processing. Unfortunately if this path has
915 // forward slashes in it (which it basically always does on Windows)
916 // then CMake will hit a syntax error later on as... something isn't
919 // Instead of attempting to fix this problem in upstream CMake and/or
920 // LLVM/LLD we just hack around it here. This thin wrapper will take the
921 // output from llvm-config and replace all instances of `\` with `/` to
922 // ensure we don't hit the same bugs with escaping. It means that you
923 // can't build on a system where your paths require `\` on Windows, but
924 // there's probably a lot of reasons you can't do that other than this.
925 let llvm_config_shim = env::current_exe().unwrap().with_file_name("llvm-config-wrapper");
927 // Re-use the same flags as llvm to control the level of debug information
928 // generated for lld.
929 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
930 (false, _) => "Debug",
931 (true, false) => "Release",
932 (true, true) => "RelWithDebInfo",
935 cfg.out_dir(&out_dir)
937 .env("LLVM_CONFIG_REAL", &llvm_config)
938 .define("LLVM_CONFIG_PATH", llvm_config_shim)
939 .define("LLVM_INCLUDE_TESTS", "OFF");
941 // While we're using this horrible workaround to shim the execution of
942 // llvm-config, let's just pile on more. I can't seem to figure out how
943 // to build LLD as a standalone project and also cross-compile it at the
944 // same time. It wants a natively executable `llvm-config` to learn
945 // about LLVM, but then it learns about all the host configuration of
946 // LLVM and tries to link to host LLVM libraries.
948 // To work around that we tell our shim to replace anything with the
949 // build target with the actual target instead. This'll break parts of
950 // LLD though which try to execute host tools, such as llvm-tblgen, so
951 // we specifically tell it where to find those. This is likely super
952 // brittle and will break over time. If anyone knows better how to
953 // cross-compile LLD it would be much appreciated to fix this!
954 if target != builder.config.build {
955 cfg.env("LLVM_CONFIG_SHIM_REPLACE", &builder.config.build.triple)
956 .env("LLVM_CONFIG_SHIM_REPLACE_WITH", &target.triple)
959 llvm_config.with_file_name("llvm-tblgen").with_extension(EXE_EXTENSION),
963 // Explicitly set C++ standard, because upstream doesn't do so
964 // for standalone builds.
965 cfg.define("CMAKE_CXX_STANDARD", "14");
969 t!(File::create(&done_stamp));
974 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
975 pub struct TestHelpers {
976 pub target: TargetSelection,
979 impl Step for TestHelpers {
982 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
983 run.path("src/test/auxiliary/rust_test_helpers.c")
986 fn make_run(run: RunConfig<'_>) {
987 run.builder.ensure(TestHelpers { target: run.target })
990 /// Compiles the `rust_test_helpers.c` library which we used in various
991 /// `run-pass` tests for ABI testing.
992 fn run(self, builder: &Builder<'_>) {
993 if builder.config.dry_run {
996 // The x86_64-fortanix-unknown-sgx target doesn't have a working C
997 // toolchain. However, some x86_64 ELF objects can be linked
998 // without issues. Use this hack to compile the test helpers.
999 let target = if self.target == "x86_64-fortanix-unknown-sgx" {
1000 TargetSelection::from_user("x86_64-unknown-linux-gnu")
1004 let dst = builder.test_helpers_out(target);
1005 let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
1006 if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
1010 builder.info("Building test helpers");
1011 t!(fs::create_dir_all(&dst));
1012 let mut cfg = cc::Build::new();
1013 // FIXME: Workaround for https://github.com/emscripten-core/emscripten/issues/9013
1014 if target.contains("emscripten") {
1018 // We may have found various cross-compilers a little differently due to our
1019 // extra configuration, so inform cc of these compilers. Note, though, that
1020 // on MSVC we still need cc's detection of env vars (ugh).
1021 if !target.contains("msvc") {
1022 if let Some(ar) = builder.ar(target) {
1025 cfg.compiler(builder.cc(target));
1027 cfg.cargo_metadata(false)
1029 .target(&target.triple)
1030 .host(&builder.config.build.triple)
1034 .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
1035 .compile("rust_test_helpers");
1039 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1040 pub struct Sanitizers {
1041 pub target: TargetSelection,
1044 impl Step for Sanitizers {
1045 type Output = Vec<SanitizerRuntime>;
1047 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1048 run.alias("sanitizers")
1051 fn make_run(run: RunConfig<'_>) {
1052 run.builder.ensure(Sanitizers { target: run.target });
1055 /// Builds sanitizer runtime libraries.
1056 fn run(self, builder: &Builder<'_>) -> Self::Output {
1057 let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
1058 if !compiler_rt_dir.exists() {
1062 let out_dir = builder.native_dir(self.target).join("sanitizers");
1063 let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
1064 if runtimes.is_empty() {
1068 let llvm_config = builder.ensure(Llvm { target: builder.config.build });
1069 if builder.config.dry_run {
1073 let stamp = out_dir.join("sanitizers-finished-building");
1074 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
1076 if stamp.is_done() {
1077 if stamp.hash.is_none() {
1078 builder.info(&format!(
1079 "Rebuild sanitizers by removing the file `{}`",
1080 stamp.path.display()
1086 builder.info(&format!("Building sanitizers for {}", self.target));
1088 let _time = util::timeit(&builder);
1090 let mut cfg = cmake::Config::new(&compiler_rt_dir);
1091 cfg.profile("Release");
1092 cfg.define("CMAKE_C_COMPILER_TARGET", self.target.triple);
1093 cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
1094 cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
1095 cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
1096 cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
1097 cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
1098 cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
1099 cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
1100 cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
1101 cfg.define("LLVM_CONFIG_PATH", &llvm_config);
1103 // On Darwin targets the sanitizer runtimes are build as universal binaries.
1104 // Unfortunately sccache currently lacks support to build them successfully.
1105 // Disable compiler launcher on Darwin targets to avoid potential issues.
1106 let use_compiler_launcher = !self.target.contains("apple-darwin");
1107 configure_cmake(builder, self.target, &mut cfg, use_compiler_launcher, LdFlags::default());
1109 t!(fs::create_dir_all(&out_dir));
1110 cfg.out_dir(out_dir);
1112 for runtime in &runtimes {
1113 cfg.build_target(&runtime.cmake_target);
1122 #[derive(Clone, Debug)]
1123 pub struct SanitizerRuntime {
1124 /// CMake target used to build the runtime.
1125 pub cmake_target: String,
1126 /// Path to the built runtime library.
1128 /// Library filename that will be used rustc.
1132 /// Returns sanitizers available on a given target.
1133 fn supported_sanitizers(
1135 target: TargetSelection,
1137 ) -> Vec<SanitizerRuntime> {
1138 let darwin_libs = |os: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
1141 .map(move |c| SanitizerRuntime {
1142 cmake_target: format!("clang_rt.{}_{}_dynamic", c, os),
1144 .join(&format!("build/lib/darwin/libclang_rt.{}_{}_dynamic.dylib", c, os)),
1145 name: format!("librustc-{}_rt.{}.dylib", channel, c),
1150 let common_libs = |os: &str, arch: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
1153 .map(move |c| SanitizerRuntime {
1154 cmake_target: format!("clang_rt.{}-{}", c, arch),
1155 path: out_dir.join(&format!("build/lib/{}/libclang_rt.{}-{}.a", os, c, arch)),
1156 name: format!("librustc-{}_rt.{}.a", channel, c),
1161 match &*target.triple {
1162 "aarch64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
1163 "aarch64-fuchsia" => common_libs("fuchsia", "aarch64", &["asan"]),
1164 "aarch64-unknown-linux-gnu" => {
1165 common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan", "hwasan"])
1167 "x86_64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
1168 "x86_64-fuchsia" => common_libs("fuchsia", "x86_64", &["asan"]),
1169 "x86_64-unknown-freebsd" => common_libs("freebsd", "x86_64", &["asan", "msan", "tsan"]),
1170 "x86_64-unknown-netbsd" => {
1171 common_libs("netbsd", "x86_64", &["asan", "lsan", "msan", "tsan"])
1173 "x86_64-unknown-illumos" => common_libs("illumos", "x86_64", &["asan"]),
1174 "x86_64-pc-solaris" => common_libs("solaris", "x86_64", &["asan"]),
1175 "x86_64-unknown-linux-gnu" => {
1176 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
1178 "x86_64-unknown-linux-musl" => {
1179 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
1187 hash: Option<Vec<u8>>,
1191 fn new(path: PathBuf, hash: Option<&str>) -> Self {
1192 HashStamp { path, hash: hash.map(|s| s.as_bytes().to_owned()) }
1195 fn is_done(&self) -> bool {
1196 match fs::read(&self.path) {
1197 Ok(h) => self.hash.as_deref().unwrap_or(b"") == h.as_slice(),
1198 Err(e) if e.kind() == io::ErrorKind::NotFound => false,
1200 panic!("failed to read stamp file `{}`: {}", self.path.display(), e);
1205 fn remove(&self) -> io::Result<()> {
1206 match fs::remove_file(&self.path) {
1209 if e.kind() == io::ErrorKind::NotFound {
1218 fn write(&self) -> io::Result<()> {
1219 fs::write(&self.path, self.hash.as_deref().unwrap_or(b""))
1223 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1224 pub struct CrtBeginEnd {
1225 pub target: TargetSelection,
1228 impl Step for CrtBeginEnd {
1229 type Output = PathBuf;
1231 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1232 run.path("src/llvm-project/compiler-rt/lib/crt")
1235 fn make_run(run: RunConfig<'_>) {
1236 run.builder.ensure(CrtBeginEnd { target: run.target });
1239 /// Build crtbegin.o/crtend.o for musl target.
1240 fn run(self, builder: &Builder<'_>) -> Self::Output {
1241 let out_dir = builder.native_dir(self.target).join("crt");
1243 if builder.config.dry_run {
1247 let crtbegin_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtbegin.c");
1248 let crtend_src = builder.src.join("src/llvm-project/compiler-rt/lib/crt/crtend.c");
1249 if up_to_date(&crtbegin_src, &out_dir.join("crtbegin.o"))
1250 && up_to_date(&crtend_src, &out_dir.join("crtendS.o"))
1255 builder.info("Building crtbegin.o and crtend.o");
1256 t!(fs::create_dir_all(&out_dir));
1258 let mut cfg = cc::Build::new();
1260 if let Some(ar) = builder.ar(self.target) {
1263 cfg.compiler(builder.cc(self.target));
1264 cfg.cargo_metadata(false)
1266 .target(&self.target.triple)
1267 .host(&builder.config.build.triple)
1274 // Those flags are defined in src/llvm-project/compiler-rt/lib/crt/CMakeLists.txt
1275 // Currently only consumer of those objects is musl, which use .init_array/.fini_array
1276 // instead of .ctors/.dtors
1277 cfg.flag("-std=c11")
1278 .define("CRT_HAS_INITFINI_ARRAY", None)
1279 .define("EH_USE_FRAME_REGISTRY", None);
1283 t!(fs::copy(out_dir.join("crtbegin.o"), out_dir.join("crtbeginS.o")));
1284 t!(fs::copy(out_dir.join("crtend.o"), out_dir.join("crtendS.o")));
1289 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1290 pub struct Libunwind {
1291 pub target: TargetSelection,
1294 impl Step for Libunwind {
1295 type Output = PathBuf;
1297 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1298 run.path("src/llvm-project/libunwind")
1301 fn make_run(run: RunConfig<'_>) {
1302 run.builder.ensure(Libunwind { target: run.target });
1305 /// Build linunwind.a
1306 fn run(self, builder: &Builder<'_>) -> Self::Output {
1307 if builder.config.dry_run {
1308 return PathBuf::new();
1311 let out_dir = builder.native_dir(self.target).join("libunwind");
1312 let root = builder.src.join("src/llvm-project/libunwind");
1314 if up_to_date(&root, &out_dir.join("libunwind.a")) {
1318 builder.info(&format!("Building libunwind.a for {}", self.target.triple));
1319 t!(fs::create_dir_all(&out_dir));
1321 let mut cc_cfg = cc::Build::new();
1322 let mut cpp_cfg = cc::Build::new();
1325 cpp_cfg.cpp_set_stdlib(None);
1326 cpp_cfg.flag("-nostdinc++");
1327 cpp_cfg.flag("-fno-exceptions");
1328 cpp_cfg.flag("-fno-rtti");
1329 cpp_cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
1331 for cfg in [&mut cc_cfg, &mut cpp_cfg].iter_mut() {
1332 if let Some(ar) = builder.ar(self.target) {
1335 cfg.target(&self.target.triple);
1336 cfg.host(&builder.config.build.triple);
1337 cfg.warnings(false);
1339 // get_compiler() need set opt_level first.
1341 cfg.flag("-fstrict-aliasing");
1342 cfg.flag("-funwind-tables");
1343 cfg.flag("-fvisibility=hidden");
1344 cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
1345 cfg.include(root.join("include"));
1346 cfg.cargo_metadata(false);
1347 cfg.out_dir(&out_dir);
1349 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1350 cfg.static_flag(true);
1351 cfg.flag("-fno-stack-protector");
1352 cfg.flag("-ffreestanding");
1353 cfg.flag("-fexceptions");
1355 // easiest way to undefine since no API available in cc::Build to undefine
1356 cfg.flag("-U_FORTIFY_SOURCE");
1357 cfg.define("_FORTIFY_SOURCE", "0");
1358 cfg.define("RUST_SGX", "1");
1359 cfg.define("__NO_STRING_INLINES", None);
1360 cfg.define("__NO_MATH_INLINES", None);
1361 cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
1362 cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
1363 cfg.define("NDEBUG", None);
1365 if self.target.contains("windows") {
1366 cfg.define("_LIBUNWIND_HIDE_SYMBOLS", "1");
1367 cfg.define("_LIBUNWIND_IS_NATIVE_ONLY", "1");
1371 cc_cfg.compiler(builder.cc(self.target));
1372 if let Ok(cxx) = builder.cxx(self.target) {
1373 cpp_cfg.compiler(cxx);
1375 cc_cfg.compiler(builder.cc(self.target));
1378 // Don't set this for clang
1379 // By default, Clang builds C code in GNU C17 mode.
1380 // By default, Clang builds C++ code according to the C++98 standard,
1381 // with many C++11 features accepted as extensions.
1382 if cc_cfg.get_compiler().is_like_gnu() {
1383 cc_cfg.flag("-std=c99");
1385 if cpp_cfg.get_compiler().is_like_gnu() {
1386 cpp_cfg.flag("-std=c++11");
1389 if self.target.contains("x86_64-fortanix-unknown-sgx") || self.target.contains("musl") {
1390 // use the same GCC C compiler command to compile C++ code so we do not need to setup the
1391 // C++ compiler env variables on the builders.
1392 // Don't set this for clang++, as clang++ is able to compile this without libc++.
1393 if cpp_cfg.get_compiler().is_like_gnu() {
1395 cpp_cfg.compiler(builder.cc(self.target));
1399 let mut c_sources = vec![
1401 "UnwindLevel1-gcc-ext.c",
1403 "UnwindRegistersRestore.S",
1404 "UnwindRegistersSave.S",
1407 let cpp_sources = vec!["Unwind-EHABI.cpp", "Unwind-seh.cpp", "libunwind.cpp"];
1408 let cpp_len = cpp_sources.len();
1410 if self.target.contains("x86_64-fortanix-unknown-sgx") {
1411 c_sources.push("UnwindRustSgx.c");
1414 for src in c_sources {
1415 cc_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1418 for src in &cpp_sources {
1419 cpp_cfg.file(root.join("src").join(src).canonicalize().unwrap());
1422 cpp_cfg.compile("unwind-cpp");
1424 // FIXME: https://github.com/alexcrichton/cc-rs/issues/545#issuecomment-679242845
1426 for entry in fs::read_dir(&out_dir).unwrap() {
1427 let file = entry.unwrap().path().canonicalize().unwrap();
1428 if file.is_file() && file.extension() == Some(OsStr::new("o")) {
1429 // file name starts with "Unwind-EHABI", "Unwind-seh" or "libunwind"
1430 let file_name = file.file_name().unwrap().to_str().expect("UTF-8 file name");
1431 if cpp_sources.iter().any(|f| file_name.starts_with(&f[..f.len() - 4])) {
1432 cc_cfg.object(&file);
1437 assert_eq!(cpp_len, count, "Can't get object files from {:?}", &out_dir);
1439 cc_cfg.compile("unwind");