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::OsString;
14 use std::fs::{self, File};
16 use std::path::{Path, PathBuf};
17 use std::process::Command;
19 use build_helper::{output, t};
21 use crate::builder::{Builder, RunConfig, ShouldRun, Step};
22 use crate::cache::Interned;
24 use crate::util::{self, exe};
26 use build_helper::up_to_date;
30 build_llvm_config: PathBuf,
35 // This returns whether we've already previously built LLVM.
37 // It's used to avoid busting caches during x.py check -- if we've already built
38 // LLVM, it's fine for us to not try to avoid doing so.
40 // This will return the llvm-config if it can get it (but it will not build it
42 pub fn prebuilt_llvm_config(
43 builder: &Builder<'_>,
44 target: Interned<String>,
45 ) -> Result<PathBuf, Meta> {
46 // If we're using a custom LLVM bail out here, but we can only use a
47 // custom LLVM for the build triple.
48 if let Some(config) = builder.config.target_config.get(&target) {
49 if let Some(ref s) = config.llvm_config {
50 check_llvm_version(builder, s);
51 return Ok(s.to_path_buf());
55 let root = "src/llvm-project/llvm";
56 let out_dir = builder.llvm_out(target);
57 let mut llvm_config_ret_dir = builder.llvm_out(builder.config.build);
58 if !builder.config.build.contains("msvc") || builder.config.ninja {
59 llvm_config_ret_dir.push("build");
61 llvm_config_ret_dir.push("bin");
63 let build_llvm_config = llvm_config_ret_dir.join(exe("llvm-config", &*builder.config.build));
65 let stamp = out_dir.join("llvm-finished-building");
66 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
68 if builder.config.llvm_skip_rebuild && stamp.path.exists() {
71 Using a potentially stale build of LLVM; \
72 This may not behave well.",
74 return Ok(build_llvm_config);
78 if stamp.hash.is_none() {
80 "Could not determine the LLVM submodule commit hash. \
81 Assuming that an LLVM rebuild is not necessary.",
83 builder.info(&format!(
84 "To force LLVM to rebuild, remove the file `{}`",
88 return Ok(build_llvm_config);
91 Err(Meta { stamp, build_llvm_config, out_dir, root: root.into() })
94 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
96 pub target: Interned<String>,
100 type Output = PathBuf; // path to llvm-config
102 const ONLY_HOSTS: bool = true;
104 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
105 run.path("src/llvm-project").path("src/llvm-project/llvm").path("src/llvm")
108 fn make_run(run: RunConfig<'_>) {
109 run.builder.ensure(Llvm { target: run.target });
112 /// Compile LLVM for `target`.
113 fn run(self, builder: &Builder<'_>) -> PathBuf {
114 let target = self.target;
115 let target_native = if self.target.starts_with("riscv") {
116 // RISC-V target triples in Rust is not named the same as C compiler target triples.
117 // This converts Rust RISC-V target triples to C compiler triples.
118 let idx = target.find('-').unwrap();
120 format!("riscv{}{}", &target[5..7], &target[idx..])
125 let Meta { stamp, build_llvm_config, out_dir, root } =
126 match prebuilt_llvm_config(builder, target) {
131 builder.info(&format!("Building LLVM for {}", target));
133 let _time = util::timeit(&builder);
134 t!(fs::create_dir_all(&out_dir));
136 // http://llvm.org/docs/CMake.html
137 let mut cfg = cmake::Config::new(builder.src.join(root));
139 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
140 (false, _) => "Debug",
141 (true, false) => "Release",
142 (true, true) => "RelWithDebInfo",
145 // NOTE: remember to also update `config.toml.example` when changing the
147 let llvm_targets = match &builder.config.llvm_targets {
150 "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;\
151 Sparc;SystemZ;WebAssembly;X86"
155 let llvm_exp_targets = match builder.config.llvm_experimental_targets {
160 let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
162 cfg.out_dir(&out_dir)
164 .define("LLVM_ENABLE_ASSERTIONS", assertions)
165 .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
166 .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
167 .define("LLVM_INCLUDE_EXAMPLES", "OFF")
168 .define("LLVM_INCLUDE_TESTS", "OFF")
169 .define("LLVM_INCLUDE_DOCS", "OFF")
170 .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
171 .define("WITH_POLLY", "OFF")
172 .define("LLVM_ENABLE_TERMINFO", "OFF")
173 .define("LLVM_ENABLE_LIBEDIT", "OFF")
174 .define("LLVM_ENABLE_BINDINGS", "OFF")
175 .define("LLVM_ENABLE_Z3_SOLVER", "OFF")
176 .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
177 .define("LLVM_TARGET_ARCH", target_native.split('-').next().unwrap())
178 .define("LLVM_DEFAULT_TARGET_TRIPLE", target_native);
180 if !target.contains("netbsd") {
181 cfg.define("LLVM_ENABLE_ZLIB", "ON");
183 // FIXME: Enable zlib on NetBSD too
184 // https://github.com/rust-lang/rust/pull/72696#issuecomment-641517185
185 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
188 // Are we compiling for iOS/tvOS?
189 if target.contains("apple-ios") || target.contains("apple-tvos") {
190 // These two defines prevent CMake from automatically trying to add a MacOSX sysroot, which leads to a compiler error.
191 cfg.define("CMAKE_OSX_SYSROOT", "/");
192 cfg.define("CMAKE_OSX_DEPLOYMENT_TARGET", "");
193 // Prevent cmake from adding -bundle to CFLAGS automatically, which leads to a compiler error because "-bitcode_bundle" also gets added.
194 cfg.define("LLVM_ENABLE_PLUGINS", "OFF");
195 // Zlib fails to link properly, leading to a compiler error.
196 cfg.define("LLVM_ENABLE_ZLIB", "OFF");
199 if builder.config.llvm_thin_lto {
200 cfg.define("LLVM_ENABLE_LTO", "Thin");
201 if !target.contains("apple") {
202 cfg.define("LLVM_ENABLE_LLD", "ON");
206 // This setting makes the LLVM tools link to the dynamic LLVM library,
207 // which saves both memory during parallel links and overall disk space
208 // for the tools. We don't do this on every platform as it doesn't work
209 // equally well everywhere.
210 if builder.llvm_link_tools_dynamically(target) {
211 cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
214 // For distribution we want the LLVM tools to be *statically* linked to libstdc++
215 if builder.config.llvm_tools_enabled {
216 if !target.contains("msvc") {
217 if target.contains("apple") {
218 cfg.define("CMAKE_EXE_LINKER_FLAGS", "-static-libstdc++");
220 cfg.define("CMAKE_EXE_LINKER_FLAGS", "-Wl,-Bsymbolic -static-libstdc++");
225 if target.starts_with("riscv") {
226 // In RISC-V, using C++ atomics require linking to `libatomic` but the LLVM build
227 // system check cannot detect this. Therefore it is set manually here.
228 if !builder.config.llvm_tools_enabled {
229 cfg.define("CMAKE_EXE_LINKER_FLAGS", "-latomic");
231 cfg.define("CMAKE_EXE_LINKER_FLAGS", "-latomic -static-libstdc++");
233 cfg.define("CMAKE_SHARED_LINKER_FLAGS", "-latomic");
236 if target.contains("msvc") {
237 cfg.define("LLVM_USE_CRT_DEBUG", "MT");
238 cfg.define("LLVM_USE_CRT_RELEASE", "MT");
239 cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
240 cfg.static_crt(true);
243 if target.starts_with("i686") {
244 cfg.define("LLVM_BUILD_32_BITS", "ON");
247 let mut enabled_llvm_projects = Vec::new();
249 if util::forcing_clang_based_tests() {
250 enabled_llvm_projects.push("clang");
251 enabled_llvm_projects.push("compiler-rt");
254 // We want libxml to be disabled.
255 // See https://github.com/rust-lang/rust/pull/50104
256 cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
258 if !enabled_llvm_projects.is_empty() {
259 enabled_llvm_projects.sort();
260 enabled_llvm_projects.dedup();
261 cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
264 if let Some(num_linkers) = builder.config.llvm_link_jobs {
266 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
270 // http://llvm.org/docs/HowToCrossCompileLLVM.html
271 if target != builder.config.build {
272 builder.ensure(Llvm { target: builder.config.build });
273 // FIXME: if the llvm root for the build triple is overridden then we
274 // should use llvm-tblgen from there, also should verify that it
275 // actually exists most of the time in normal installs of LLVM.
276 let host_bin = builder.llvm_out(builder.config.build).join("bin");
277 cfg.define("CMAKE_CROSSCOMPILING", "True");
278 cfg.define("LLVM_TABLEGEN", host_bin.join("llvm-tblgen").with_extension(EXE_EXTENSION));
279 cfg.define("LLVM_NM", host_bin.join("llvm-nm").with_extension(EXE_EXTENSION));
282 host_bin.join("llvm-config").with_extension(EXE_EXTENSION),
285 if target.contains("netbsd") {
286 cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
287 } else if target.contains("freebsd") {
288 cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
289 } else if target.contains("windows") {
290 cfg.define("CMAKE_SYSTEM_NAME", "Windows");
294 if let Some(ref suffix) = builder.config.llvm_version_suffix {
295 // Allow version-suffix="" to not define a version suffix at all.
296 if !suffix.is_empty() {
297 cfg.define("LLVM_VERSION_SUFFIX", suffix);
299 } else if builder.config.channel == "dev" {
300 // Changes to a version suffix require a complete rebuild of the LLVM.
301 // To avoid rebuilds during a time of version bump, don't include rustc
302 // release number on the dev channel.
303 cfg.define("LLVM_VERSION_SUFFIX", "-rust-dev");
305 let suffix = format!("-rust-{}-{}", channel::CFG_RELEASE_NUM, builder.config.channel);
306 cfg.define("LLVM_VERSION_SUFFIX", suffix);
309 if let Some(ref linker) = builder.config.llvm_use_linker {
310 cfg.define("LLVM_USE_LINKER", linker);
313 if let Some(true) = builder.config.llvm_allow_old_toolchain {
314 cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
317 if let Some(ref python) = builder.config.python {
318 cfg.define("PYTHON_EXECUTABLE", python);
321 configure_cmake(builder, target, &mut cfg, true);
323 // FIXME: we don't actually need to build all LLVM tools and all LLVM
324 // libraries here, e.g., we just want a few components and a few
325 // tools. Figure out how to filter them down and only build the right
326 // tools and libs on all platforms.
328 if builder.config.dry_run {
329 return build_llvm_config;
340 fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
341 if !builder.config.llvm_version_check {
345 if builder.config.dry_run {
349 let mut cmd = Command::new(llvm_config);
350 let version = output(cmd.arg("--version"));
351 let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
352 if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
357 panic!("\n\nbad LLVM version: {}, need >=8.0\n\n", version)
361 builder: &Builder<'_>,
362 target: Interned<String>,
363 cfg: &mut cmake::Config,
364 use_compiler_launcher: bool,
366 // Do not print installation messages for up-to-date files.
367 // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
368 cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
370 // Do not allow the user's value of DESTDIR to influence where
371 // LLVM will install itself. LLVM must always be installed in our
372 // own build directories.
373 cfg.env("DESTDIR", "");
375 if builder.config.ninja {
376 cfg.generator("Ninja");
378 cfg.target(&target).host(&builder.config.build);
380 let sanitize_cc = |cc: &Path| {
381 if target.contains("msvc") {
382 OsString::from(cc.to_str().unwrap().replace("\\", "/"))
384 cc.as_os_str().to_owned()
388 // MSVC with CMake uses msbuild by default which doesn't respect these
389 // vars that we'd otherwise configure. In that case we just skip this
391 if target.contains("msvc") && !builder.config.ninja {
395 let (cc, cxx) = match builder.config.llvm_clang_cl {
396 Some(ref cl) => (cl.as_ref(), cl.as_ref()),
397 None => (builder.cc(target), builder.cxx(target).unwrap()),
400 // Handle msvc + ninja + ccache specially (this is what the bots use)
401 if target.contains("msvc") && builder.config.ninja && builder.config.ccache.is_some() {
402 let mut wrap_cc = env::current_exe().expect("failed to get cwd");
403 wrap_cc.set_file_name("sccache-plus-cl.exe");
405 cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
406 .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
407 cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
408 .env("SCCACHE_TARGET", target)
409 .env("SCCACHE_CC", &cc)
410 .env("SCCACHE_CXX", &cxx);
412 // Building LLVM on MSVC can be a little ludicrous at times. We're so far
413 // off the beaten path here that I'm not really sure this is even half
414 // supported any more. Here we're trying to:
416 // * Build LLVM on MSVC
417 // * Build LLVM with `clang-cl` instead of `cl.exe`
418 // * Build a project with `sccache`
419 // * Build for 32-bit as well
420 // * Build with Ninja
422 // For `cl.exe` there are different binaries to compile 32/64 bit which
423 // we use but for `clang-cl` there's only one which internally
424 // multiplexes via flags. As a result it appears that CMake's detection
425 // of a compiler's architecture and such on MSVC **doesn't** pass any
426 // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
427 // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
428 // definitely causes problems since all the env vars are pointing to
431 // To hack around this... again... we pass an argument that's
432 // unconditionally passed in the sccache shim. This'll get CMake to
433 // correctly diagnose it's doing a 32-bit compilation and LLVM will
434 // internally configure itself appropriately.
435 if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
436 cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
439 // If ccache is configured we inform the build a little differently how
440 // to invoke ccache while also invoking our compilers.
441 if use_compiler_launcher {
442 if let Some(ref ccache) = builder.config.ccache {
443 cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
444 .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
447 cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
448 .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx));
451 cfg.build_arg("-j").build_arg(builder.jobs().to_string());
452 let mut cflags = builder.cflags(target, GitRepo::Llvm).join(" ");
453 if let Some(ref s) = builder.config.llvm_cflags {
454 cflags.push_str(&format!(" {}", s));
456 // Some compiler features used by LLVM (such as thread locals) will not work on a min version below iOS 10.
457 if target.contains("apple-ios") {
458 if target.contains("86-") {
459 cflags.push_str(" -miphonesimulator-version-min=10.0");
461 cflags.push_str(" -miphoneos-version-min=10.0");
464 if builder.config.llvm_clang_cl.is_some() {
465 cflags.push_str(&format!(" --target={}", target))
467 cfg.define("CMAKE_C_FLAGS", cflags);
468 let mut cxxflags = builder.cflags(target, GitRepo::Llvm).join(" ");
469 if builder.config.llvm_static_stdcpp && !target.contains("msvc") && !target.contains("netbsd") {
470 cxxflags.push_str(" -static-libstdc++");
472 if let Some(ref s) = builder.config.llvm_cxxflags {
473 cxxflags.push_str(&format!(" {}", s));
475 if builder.config.llvm_clang_cl.is_some() {
476 cxxflags.push_str(&format!(" --target={}", target))
478 cfg.define("CMAKE_CXX_FLAGS", cxxflags);
479 if let Some(ar) = builder.ar(target) {
480 if ar.is_absolute() {
481 // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
482 // tries to resolve this path in the LLVM build directory.
483 cfg.define("CMAKE_AR", sanitize_cc(ar));
487 if let Some(ranlib) = builder.ranlib(target) {
488 if ranlib.is_absolute() {
489 // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
490 // tries to resolve this path in the LLVM build directory.
491 cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
495 if let Some(ref s) = builder.config.llvm_ldflags {
496 cfg.define("CMAKE_SHARED_LINKER_FLAGS", s);
497 cfg.define("CMAKE_MODULE_LINKER_FLAGS", s);
498 cfg.define("CMAKE_EXE_LINKER_FLAGS", s);
501 if env::var_os("SCCACHE_ERROR_LOG").is_some() {
502 cfg.env("RUSTC_LOG", "sccache=warn");
506 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
508 pub target: Interned<String>,
512 type Output = PathBuf;
513 const ONLY_HOSTS: bool = true;
515 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
516 run.path("src/llvm-project/lld").path("src/tools/lld")
519 fn make_run(run: RunConfig<'_>) {
520 run.builder.ensure(Lld { target: run.target });
523 /// Compile LLD for `target`.
524 fn run(self, builder: &Builder<'_>) -> PathBuf {
525 if builder.config.dry_run {
526 return PathBuf::from("lld-out-dir-test-gen");
528 let target = self.target;
530 let llvm_config = builder.ensure(Llvm { target: self.target });
532 let out_dir = builder.lld_out(target);
533 let done_stamp = out_dir.join("lld-finished-building");
534 if done_stamp.exists() {
538 builder.info(&format!("Building LLD for {}", target));
539 let _time = util::timeit(&builder);
540 t!(fs::create_dir_all(&out_dir));
542 let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
543 configure_cmake(builder, target, &mut cfg, true);
545 // This is an awful, awful hack. Discovered when we migrated to using
546 // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
547 // tree, will execute `llvm-config --cmakedir` and then tell CMake about
548 // that directory for later processing. Unfortunately if this path has
549 // forward slashes in it (which it basically always does on Windows)
550 // then CMake will hit a syntax error later on as... something isn't
553 // Instead of attempting to fix this problem in upstream CMake and/or
554 // LLVM/LLD we just hack around it here. This thin wrapper will take the
555 // output from llvm-config and replace all instances of `\` with `/` to
556 // ensure we don't hit the same bugs with escaping. It means that you
557 // can't build on a system where your paths require `\` on Windows, but
558 // there's probably a lot of reasons you can't do that other than this.
559 let llvm_config_shim = env::current_exe().unwrap().with_file_name("llvm-config-wrapper");
561 cfg.out_dir(&out_dir)
563 .env("LLVM_CONFIG_REAL", &llvm_config)
564 .define("LLVM_CONFIG_PATH", llvm_config_shim)
565 .define("LLVM_INCLUDE_TESTS", "OFF");
567 // While we're using this horrible workaround to shim the execution of
568 // llvm-config, let's just pile on more. I can't seem to figure out how
569 // to build LLD as a standalone project and also cross-compile it at the
570 // same time. It wants a natively executable `llvm-config` to learn
571 // about LLVM, but then it learns about all the host configuration of
572 // LLVM and tries to link to host LLVM libraries.
574 // To work around that we tell our shim to replace anything with the
575 // build target with the actual target instead. This'll break parts of
576 // LLD though which try to execute host tools, such as llvm-tblgen, so
577 // we specifically tell it where to find those. This is likely super
578 // brittle and will break over time. If anyone knows better how to
579 // cross-compile LLD it would be much appreciated to fix this!
580 if target != builder.config.build {
581 cfg.env("LLVM_CONFIG_SHIM_REPLACE", &builder.config.build)
582 .env("LLVM_CONFIG_SHIM_REPLACE_WITH", &target)
585 llvm_config.with_file_name("llvm-tblgen").with_extension(EXE_EXTENSION),
589 // Explicitly set C++ standard, because upstream doesn't do so
590 // for standalone builds.
591 cfg.define("CMAKE_CXX_STANDARD", "14");
595 t!(File::create(&done_stamp));
600 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
601 pub struct TestHelpers {
602 pub target: Interned<String>,
605 impl Step for TestHelpers {
608 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
609 run.path("src/test/auxiliary/rust_test_helpers.c")
612 fn make_run(run: RunConfig<'_>) {
613 run.builder.ensure(TestHelpers { target: run.target })
616 /// Compiles the `rust_test_helpers.c` library which we used in various
617 /// `run-pass` tests for ABI testing.
618 fn run(self, builder: &Builder<'_>) {
619 if builder.config.dry_run {
622 let target = self.target;
623 let dst = builder.test_helpers_out(target);
624 let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
625 if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
629 builder.info("Building test helpers");
630 t!(fs::create_dir_all(&dst));
631 let mut cfg = cc::Build::new();
632 // FIXME: Workaround for https://github.com/emscripten-core/emscripten/issues/9013
633 if target.contains("emscripten") {
637 // We may have found various cross-compilers a little differently due to our
638 // extra configuration, so inform cc of these compilers. Note, though, that
639 // on MSVC we still need cc's detection of env vars (ugh).
640 if !target.contains("msvc") {
641 if let Some(ar) = builder.ar(target) {
644 cfg.compiler(builder.cc(target));
647 cfg.cargo_metadata(false)
650 .host(&builder.config.build)
654 .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
655 .compile("rust_test_helpers");
659 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
660 pub struct Sanitizers {
661 pub target: Interned<String>,
664 impl Step for Sanitizers {
665 type Output = Vec<SanitizerRuntime>;
667 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
668 run.path("src/llvm-project/compiler-rt").path("src/sanitizers")
671 fn make_run(run: RunConfig<'_>) {
672 run.builder.ensure(Sanitizers { target: run.target });
675 /// Builds sanitizer runtime libraries.
676 fn run(self, builder: &Builder<'_>) -> Self::Output {
677 let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
678 if !compiler_rt_dir.exists() {
682 let out_dir = builder.native_dir(self.target).join("sanitizers");
683 let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
684 if runtimes.is_empty() {
688 let llvm_config = builder.ensure(Llvm { target: builder.config.build });
689 if builder.config.dry_run {
693 let stamp = out_dir.join("sanitizers-finished-building");
694 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
697 if stamp.hash.is_none() {
698 builder.info(&format!(
699 "Rebuild sanitizers by removing the file `{}`",
706 builder.info(&format!("Building sanitizers for {}", self.target));
708 let _time = util::timeit(&builder);
710 let mut cfg = cmake::Config::new(&compiler_rt_dir);
711 cfg.profile("Release");
712 cfg.define("CMAKE_C_COMPILER_TARGET", self.target);
713 cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
714 cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
715 cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
716 cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
717 cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
718 cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
719 cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
720 cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
721 cfg.define("LLVM_CONFIG_PATH", &llvm_config);
723 // On Darwin targets the sanitizer runtimes are build as universal binaries.
724 // Unfortunately sccache currently lacks support to build them successfully.
725 // Disable compiler launcher on Darwin targets to avoid potential issues.
726 let use_compiler_launcher = !self.target.contains("apple-darwin");
727 configure_cmake(builder, self.target, &mut cfg, use_compiler_launcher);
729 t!(fs::create_dir_all(&out_dir));
730 cfg.out_dir(out_dir);
732 for runtime in &runtimes {
733 cfg.build_target(&runtime.cmake_target);
742 #[derive(Clone, Debug)]
743 pub struct SanitizerRuntime {
744 /// CMake target used to build the runtime.
745 pub cmake_target: String,
746 /// Path to the built runtime library.
748 /// Library filename that will be used rustc.
752 /// Returns sanitizers available on a given target.
753 fn supported_sanitizers(
755 target: Interned<String>,
757 ) -> Vec<SanitizerRuntime> {
758 let darwin_libs = |os: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
761 .map(move |c| SanitizerRuntime {
762 cmake_target: format!("clang_rt.{}_{}_dynamic", c, os),
764 .join(&format!("build/lib/darwin/libclang_rt.{}_{}_dynamic.dylib", c, os)),
765 name: format!("librustc-{}_rt.{}.dylib", channel, c),
770 let common_libs = |os: &str, arch: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
773 .map(move |c| SanitizerRuntime {
774 cmake_target: format!("clang_rt.{}-{}", c, arch),
775 path: out_dir.join(&format!("build/lib/{}/libclang_rt.{}-{}.a", os, c, arch)),
776 name: format!("librustc-{}_rt.{}.a", channel, c),
782 "aarch64-fuchsia" => common_libs("fuchsia", "aarch64", &["asan"]),
783 "aarch64-unknown-linux-gnu" => {
784 common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan"])
786 "x86_64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
787 "x86_64-fuchsia" => common_libs("fuchsia", "x86_64", &["asan"]),
788 "x86_64-unknown-linux-gnu" => {
789 common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
797 hash: Option<Vec<u8>>,
801 fn new(path: PathBuf, hash: Option<&str>) -> Self {
802 HashStamp { path, hash: hash.map(|s| s.as_bytes().to_owned()) }
805 fn is_done(&self) -> bool {
806 match fs::read(&self.path) {
807 Ok(h) => self.hash.as_deref().unwrap_or(b"") == h.as_slice(),
808 Err(e) if e.kind() == io::ErrorKind::NotFound => false,
810 panic!("failed to read stamp file `{}`: {}", self.path.display(), e);
815 fn remove(&self) -> io::Result<()> {
816 match fs::remove_file(&self.path) {
819 if e.kind() == io::ErrorKind::NotFound {
828 fn write(&self) -> io::Result<()> {
829 fs::write(&self.path, self.hash.as_deref().unwrap_or(b""))