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::ffi::OsString;
13 use std::fs::{self, File};
15 use std::path::{Path, PathBuf};
16 use std::process::Command;
18 use build_helper::{output, t};
20 use crate::builder::{Builder, RunConfig, ShouldRun, Step};
21 use crate::cache::Interned;
23 use crate::util::{self, exe};
25 use build_helper::up_to_date;
27 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
29 pub target: Interned<String>,
33 type Output = PathBuf; // path to llvm-config
35 const ONLY_HOSTS: bool = true;
37 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
38 run.path("src/llvm-project").path("src/llvm-project/llvm").path("src/llvm")
41 fn make_run(run: RunConfig<'_>) {
42 run.builder.ensure(Llvm { target: run.target });
45 /// Compile LLVM for `target`.
46 fn run(self, builder: &Builder<'_>) -> PathBuf {
47 let target = self.target;
49 // If we're using a custom LLVM bail out here, but we can only use a
50 // custom LLVM for the build triple.
51 if let Some(config) = builder.config.target_config.get(&target) {
52 if let Some(ref s) = config.llvm_config {
53 check_llvm_version(builder, s);
54 return s.to_path_buf();
58 let root = "src/llvm-project/llvm";
59 let out_dir = builder.llvm_out(target);
60 let mut llvm_config_ret_dir = builder.llvm_out(builder.config.build);
61 if !builder.config.build.contains("msvc") || builder.config.ninja {
62 llvm_config_ret_dir.push("build");
64 llvm_config_ret_dir.push("bin");
66 let build_llvm_config =
67 llvm_config_ret_dir.join(exe("llvm-config", &*builder.config.build));
69 let stamp = out_dir.join("llvm-finished-building");
70 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
72 if builder.config.llvm_skip_rebuild && stamp.path.exists() {
75 Using a potentially stale build of LLVM; \
76 This may not behave well.",
78 return build_llvm_config;
82 if stamp.hash.is_none() {
84 "Could not determine the LLVM submodule commit hash. \
85 Assuming that an LLVM rebuild is not necessary.",
87 builder.info(&format!(
88 "To force LLVM to rebuild, remove the file `{}`",
92 return build_llvm_config;
95 builder.info(&format!("Building LLVM for {}", target));
97 let _time = util::timeit(&builder);
98 t!(fs::create_dir_all(&out_dir));
100 // http://llvm.org/docs/CMake.html
101 let mut cfg = cmake::Config::new(builder.src.join(root));
103 let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
104 (false, _) => "Debug",
105 (true, false) => "Release",
106 (true, true) => "RelWithDebInfo",
109 // NOTE: remember to also update `config.toml.example` when changing the
111 let llvm_targets = match &builder.config.llvm_targets {
114 "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;\
115 Sparc;SystemZ;WebAssembly;X86"
119 let llvm_exp_targets = match builder.config.llvm_experimental_targets {
124 let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
126 cfg.out_dir(&out_dir)
128 .define("LLVM_ENABLE_ASSERTIONS", assertions)
129 .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
130 .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
131 .define("LLVM_INCLUDE_EXAMPLES", "OFF")
132 .define("LLVM_INCLUDE_TESTS", "OFF")
133 .define("LLVM_INCLUDE_DOCS", "OFF")
134 .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
135 .define("LLVM_ENABLE_ZLIB", "OFF")
136 .define("WITH_POLLY", "OFF")
137 .define("LLVM_ENABLE_TERMINFO", "OFF")
138 .define("LLVM_ENABLE_LIBEDIT", "OFF")
139 .define("LLVM_ENABLE_BINDINGS", "OFF")
140 .define("LLVM_ENABLE_Z3_SOLVER", "OFF")
141 .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
142 .define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
143 .define("LLVM_DEFAULT_TARGET_TRIPLE", target);
145 if builder.config.llvm_thin_lto {
146 cfg.define("LLVM_ENABLE_LTO", "Thin");
147 if !target.contains("apple") {
148 cfg.define("LLVM_ENABLE_LLD", "ON");
152 // This setting makes the LLVM tools link to the dynamic LLVM library,
153 // which saves both memory during parallel links and overall disk space
154 // for the tools. We don't do this on every platform as it doesn't work
155 // equally well everywhere.
156 if builder.llvm_link_tools_dynamically(target) {
157 cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
160 // For distribution we want the LLVM tools to be *statically* linked to libstdc++
161 if builder.config.llvm_tools_enabled || builder.config.lldb_enabled {
162 if !target.contains("msvc") {
163 if target.contains("apple") {
164 cfg.define("CMAKE_EXE_LINKER_FLAGS", "-static-libstdc++");
166 cfg.define("CMAKE_EXE_LINKER_FLAGS", "-Wl,-Bsymbolic -static-libstdc++");
171 if target.contains("msvc") {
172 cfg.define("LLVM_USE_CRT_DEBUG", "MT");
173 cfg.define("LLVM_USE_CRT_RELEASE", "MT");
174 cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
175 cfg.static_crt(true);
178 if target.starts_with("i686") {
179 cfg.define("LLVM_BUILD_32_BITS", "ON");
182 let mut enabled_llvm_projects = Vec::new();
184 if util::forcing_clang_based_tests() {
185 enabled_llvm_projects.push("clang");
186 enabled_llvm_projects.push("compiler-rt");
189 if builder.config.lldb_enabled {
190 enabled_llvm_projects.push("clang");
191 enabled_llvm_projects.push("lldb");
192 // For the time being, disable code signing.
193 cfg.define("LLDB_CODESIGN_IDENTITY", "");
194 cfg.define("LLDB_NO_DEBUGSERVER", "ON");
196 // LLDB requires libxml2; but otherwise we want it to be disabled.
197 // See https://github.com/rust-lang/rust/pull/50104
198 cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
201 if !enabled_llvm_projects.is_empty() {
202 enabled_llvm_projects.sort();
203 enabled_llvm_projects.dedup();
204 cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
207 if let Some(num_linkers) = builder.config.llvm_link_jobs {
209 cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
213 // http://llvm.org/docs/HowToCrossCompileLLVM.html
214 if target != builder.config.build {
215 builder.ensure(Llvm { target: builder.config.build });
216 // FIXME: if the llvm root for the build triple is overridden then we
217 // should use llvm-tblgen from there, also should verify that it
218 // actually exists most of the time in normal installs of LLVM.
219 let host = builder.llvm_out(builder.config.build).join("bin/llvm-tblgen");
220 cfg.define("CMAKE_CROSSCOMPILING", "True").define("LLVM_TABLEGEN", &host);
222 if target.contains("netbsd") {
223 cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
224 } else if target.contains("freebsd") {
225 cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
226 } else if target.contains("windows") {
227 cfg.define("CMAKE_SYSTEM_NAME", "Windows");
230 cfg.define("LLVM_NATIVE_BUILD", builder.llvm_out(builder.config.build).join("build"));
233 if let Some(ref suffix) = builder.config.llvm_version_suffix {
234 // Allow version-suffix="" to not define a version suffix at all.
235 if !suffix.is_empty() {
236 cfg.define("LLVM_VERSION_SUFFIX", suffix);
238 } else if builder.config.channel == "dev" {
239 // Changes to a version suffix require a complete rebuild of the LLVM.
240 // To avoid rebuilds during a time of version bump, don't include rustc
241 // release number on the dev channel.
242 cfg.define("LLVM_VERSION_SUFFIX", "-rust-dev");
244 let suffix = format!("-rust-{}-{}", channel::CFG_RELEASE_NUM, builder.config.channel);
245 cfg.define("LLVM_VERSION_SUFFIX", suffix);
248 if let Some(ref linker) = builder.config.llvm_use_linker {
249 cfg.define("LLVM_USE_LINKER", linker);
252 if let Some(true) = builder.config.llvm_allow_old_toolchain {
253 cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
256 if let Some(ref python) = builder.config.python {
257 cfg.define("PYTHON_EXECUTABLE", python);
260 configure_cmake(builder, target, &mut cfg, true);
262 // FIXME: we don't actually need to build all LLVM tools and all LLVM
263 // libraries here, e.g., we just want a few components and a few
264 // tools. Figure out how to filter them down and only build the right
265 // tools and libs on all platforms.
267 if builder.config.dry_run {
268 return build_llvm_config;
279 fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
280 if !builder.config.llvm_version_check {
284 if builder.config.dry_run {
288 let mut cmd = Command::new(llvm_config);
289 let version = output(cmd.arg("--version"));
290 let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
291 if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
296 panic!("\n\nbad LLVM version: {}, need >=8.0\n\n", version)
300 builder: &Builder<'_>,
301 target: Interned<String>,
302 cfg: &mut cmake::Config,
303 use_compiler_launcher: bool,
305 // Do not print installation messages for up-to-date files.
306 // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
307 cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
309 if builder.config.ninja {
310 cfg.generator("Ninja");
312 cfg.target(&target).host(&builder.config.build);
314 let sanitize_cc = |cc: &Path| {
315 if target.contains("msvc") {
316 OsString::from(cc.to_str().unwrap().replace("\\", "/"))
318 cc.as_os_str().to_owned()
322 // MSVC with CMake uses msbuild by default which doesn't respect these
323 // vars that we'd otherwise configure. In that case we just skip this
325 if target.contains("msvc") && !builder.config.ninja {
329 let (cc, cxx) = match builder.config.llvm_clang_cl {
330 Some(ref cl) => (cl.as_ref(), cl.as_ref()),
331 None => (builder.cc(target), builder.cxx(target).unwrap()),
334 // Handle msvc + ninja + ccache specially (this is what the bots use)
335 if target.contains("msvc") && builder.config.ninja && builder.config.ccache.is_some() {
336 let mut wrap_cc = env::current_exe().expect("failed to get cwd");
337 wrap_cc.set_file_name("sccache-plus-cl.exe");
339 cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
340 .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
341 cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
342 .env("SCCACHE_TARGET", target)
343 .env("SCCACHE_CC", &cc)
344 .env("SCCACHE_CXX", &cxx);
346 // Building LLVM on MSVC can be a little ludicrous at times. We're so far
347 // off the beaten path here that I'm not really sure this is even half
348 // supported any more. Here we're trying to:
350 // * Build LLVM on MSVC
351 // * Build LLVM with `clang-cl` instead of `cl.exe`
352 // * Build a project with `sccache`
353 // * Build for 32-bit as well
354 // * Build with Ninja
356 // For `cl.exe` there are different binaries to compile 32/64 bit which
357 // we use but for `clang-cl` there's only one which internally
358 // multiplexes via flags. As a result it appears that CMake's detection
359 // of a compiler's architecture and such on MSVC **doesn't** pass any
360 // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
361 // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
362 // definitely causes problems since all the env vars are pointing to
365 // To hack around this... again... we pass an argument that's
366 // unconditionally passed in the sccache shim. This'll get CMake to
367 // correctly diagnose it's doing a 32-bit compilation and LLVM will
368 // internally configure itself appropriately.
369 if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
370 cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
373 // If ccache is configured we inform the build a little differently how
374 // to invoke ccache while also invoking our compilers.
375 if use_compiler_launcher {
376 if let Some(ref ccache) = builder.config.ccache {
377 cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
378 .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
381 cfg.define("CMAKE_C_COMPILER", sanitize_cc(cc))
382 .define("CMAKE_CXX_COMPILER", sanitize_cc(cxx));
385 cfg.build_arg("-j").build_arg(builder.jobs().to_string());
386 let mut cflags = builder.cflags(target, GitRepo::Llvm).join(" ");
387 if let Some(ref s) = builder.config.llvm_cflags {
388 cflags.push_str(&format!(" {}", s));
390 cfg.define("CMAKE_C_FLAGS", cflags);
391 let mut cxxflags = builder.cflags(target, GitRepo::Llvm).join(" ");
392 if builder.config.llvm_static_stdcpp && !target.contains("msvc") && !target.contains("netbsd") {
393 cxxflags.push_str(" -static-libstdc++");
395 if let Some(ref s) = builder.config.llvm_cxxflags {
396 cxxflags.push_str(&format!(" {}", s));
398 cfg.define("CMAKE_CXX_FLAGS", cxxflags);
399 if let Some(ar) = builder.ar(target) {
400 if ar.is_absolute() {
401 // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
402 // tries to resolve this path in the LLVM build directory.
403 cfg.define("CMAKE_AR", sanitize_cc(ar));
407 if let Some(ranlib) = builder.ranlib(target) {
408 if ranlib.is_absolute() {
409 // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
410 // tries to resolve this path in the LLVM build directory.
411 cfg.define("CMAKE_RANLIB", sanitize_cc(ranlib));
415 if let Some(ref s) = builder.config.llvm_ldflags {
416 cfg.define("CMAKE_SHARED_LINKER_FLAGS", s);
417 cfg.define("CMAKE_MODULE_LINKER_FLAGS", s);
418 cfg.define("CMAKE_EXE_LINKER_FLAGS", s);
421 if env::var_os("SCCACHE_ERROR_LOG").is_some() {
422 cfg.env("RUSTC_LOG", "sccache=warn");
426 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
428 pub target: Interned<String>,
432 type Output = PathBuf;
433 const ONLY_HOSTS: bool = true;
435 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
436 run.path("src/llvm-project/lld").path("src/tools/lld")
439 fn make_run(run: RunConfig<'_>) {
440 run.builder.ensure(Lld { target: run.target });
443 /// Compile LLVM for `target`.
444 fn run(self, builder: &Builder<'_>) -> PathBuf {
445 if builder.config.dry_run {
446 return PathBuf::from("lld-out-dir-test-gen");
448 let target = self.target;
450 let llvm_config = builder.ensure(Llvm { target: self.target });
452 let out_dir = builder.lld_out(target);
453 let done_stamp = out_dir.join("lld-finished-building");
454 if done_stamp.exists() {
458 builder.info(&format!("Building LLD for {}", target));
459 let _time = util::timeit(&builder);
460 t!(fs::create_dir_all(&out_dir));
462 let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
463 configure_cmake(builder, target, &mut cfg, true);
465 // This is an awful, awful hack. Discovered when we migrated to using
466 // clang-cl to compile LLVM/LLD it turns out that LLD, when built out of
467 // tree, will execute `llvm-config --cmakedir` and then tell CMake about
468 // that directory for later processing. Unfortunately if this path has
469 // forward slashes in it (which it basically always does on Windows)
470 // then CMake will hit a syntax error later on as... something isn't
473 // Instead of attempting to fix this problem in upstream CMake and/or
474 // LLVM/LLD we just hack around it here. This thin wrapper will take the
475 // output from llvm-config and replace all instances of `\` with `/` to
476 // ensure we don't hit the same bugs with escaping. It means that you
477 // can't build on a system where your paths require `\` on Windows, but
478 // there's probably a lot of reasons you can't do that other than this.
479 let llvm_config_shim = env::current_exe().unwrap().with_file_name("llvm-config-wrapper");
480 cfg.out_dir(&out_dir)
482 .env("LLVM_CONFIG_REAL", &llvm_config)
483 .define("LLVM_CONFIG_PATH", llvm_config_shim)
484 .define("LLVM_INCLUDE_TESTS", "OFF");
486 // While we're using this horrible workaround to shim the execution of
487 // llvm-config, let's just pile on more. I can't seem to figure out how
488 // to build LLD as a standalone project and also cross-compile it at the
489 // same time. It wants a natively executable `llvm-config` to learn
490 // about LLVM, but then it learns about all the host configuration of
491 // LLVM and tries to link to host LLVM libraries.
493 // To work around that we tell our shim to replace anything with the
494 // build target with the actual target instead. This'll break parts of
495 // LLD though which try to execute host tools, such as llvm-tblgen, so
496 // we specifically tell it where to find those. This is likely super
497 // brittle and will break over time. If anyone knows better how to
498 // cross-compile LLD it would be much appreciated to fix this!
499 if target != builder.config.build {
500 cfg.env("LLVM_CONFIG_SHIM_REPLACE", &builder.config.build)
501 .env("LLVM_CONFIG_SHIM_REPLACE_WITH", &target)
502 .define("LLVM_TABLEGEN_EXE", llvm_config.with_file_name("llvm-tblgen"));
507 t!(File::create(&done_stamp));
512 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
513 pub struct TestHelpers {
514 pub target: Interned<String>,
517 impl Step for TestHelpers {
520 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
521 run.path("src/test/auxiliary/rust_test_helpers.c")
524 fn make_run(run: RunConfig<'_>) {
525 run.builder.ensure(TestHelpers { target: run.target })
528 /// Compiles the `rust_test_helpers.c` library which we used in various
529 /// `run-pass` tests for ABI testing.
530 fn run(self, builder: &Builder<'_>) {
531 if builder.config.dry_run {
534 let target = self.target;
535 let dst = builder.test_helpers_out(target);
536 let src = builder.src.join("src/test/auxiliary/rust_test_helpers.c");
537 if up_to_date(&src, &dst.join("librust_test_helpers.a")) {
541 builder.info("Building test helpers");
542 t!(fs::create_dir_all(&dst));
543 let mut cfg = cc::Build::new();
544 // FIXME: Workaround for https://github.com/emscripten-core/emscripten/issues/9013
545 if target.contains("emscripten") {
549 // We may have found various cross-compilers a little differently due to our
550 // extra configuration, so inform gcc of these compilers. Note, though, that
551 // on MSVC we still need gcc's detection of env vars (ugh).
552 if !target.contains("msvc") {
553 if let Some(ar) = builder.ar(target) {
556 cfg.compiler(builder.cc(target));
559 cfg.cargo_metadata(false)
562 .host(&builder.config.build)
566 .file(builder.src.join("src/test/auxiliary/rust_test_helpers.c"))
567 .compile("rust_test_helpers");
571 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
572 pub struct Sanitizers {
573 pub target: Interned<String>,
576 impl Step for Sanitizers {
577 type Output = Vec<SanitizerRuntime>;
579 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
580 run.path("src/llvm-project/compiler-rt").path("src/sanitizers")
583 fn make_run(run: RunConfig<'_>) {
584 run.builder.ensure(Sanitizers { target: run.target });
587 /// Builds sanitizer runtime libraries.
588 fn run(self, builder: &Builder<'_>) -> Self::Output {
589 let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
590 if !compiler_rt_dir.exists() {
594 let out_dir = builder.native_dir(self.target).join("sanitizers");
595 let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
596 if runtimes.is_empty() {
600 let llvm_config = builder.ensure(Llvm { target: builder.config.build });
601 if builder.config.dry_run {
605 let stamp = out_dir.join("sanitizers-finished-building");
606 let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
609 if stamp.hash.is_none() {
610 builder.info(&format!(
611 "Rebuild sanitizers by removing the file `{}`",
618 builder.info(&format!("Building sanitizers for {}", self.target));
620 let _time = util::timeit(&builder);
622 let mut cfg = cmake::Config::new(&compiler_rt_dir);
623 cfg.profile("Release");
624 cfg.define("CMAKE_C_COMPILER_TARGET", self.target);
625 cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
626 cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
627 cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
628 cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
629 cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
630 cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
631 cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
632 cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
633 cfg.define("LLVM_CONFIG_PATH", &llvm_config);
635 // On Darwin targets the sanitizer runtimes are build as universal binaries.
636 // Unfortunately sccache currently lacks support to build them successfully.
637 // Disable compiler launcher on Darwin targets to avoid potential issues.
638 let use_compiler_launcher = !self.target.contains("apple-darwin");
639 configure_cmake(builder, self.target, &mut cfg, use_compiler_launcher);
641 t!(fs::create_dir_all(&out_dir));
642 cfg.out_dir(out_dir);
644 for runtime in &runtimes {
645 cfg.build_target(&runtime.cmake_target);
654 #[derive(Clone, Debug)]
655 pub struct SanitizerRuntime {
656 /// CMake target used to build the runtime.
657 pub cmake_target: String,
658 /// Path to the built runtime library.
660 /// Library filename that will be used rustc.
664 /// Returns sanitizers available on a given target.
665 fn supported_sanitizers(
667 target: Interned<String>,
669 ) -> Vec<SanitizerRuntime> {
670 let mut result = Vec::new();
672 "x86_64-apple-darwin" => {
673 for s in &["asan", "lsan", "tsan"] {
674 result.push(SanitizerRuntime {
675 cmake_target: format!("clang_rt.{}_osx_dynamic", s),
677 .join(&format!("build/lib/darwin/libclang_rt.{}_osx_dynamic.dylib", s)),
678 name: format!("librustc-{}_rt.{}.dylib", channel, s),
682 "x86_64-unknown-linux-gnu" => {
683 for s in &["asan", "lsan", "msan", "tsan"] {
684 result.push(SanitizerRuntime {
685 cmake_target: format!("clang_rt.{}-x86_64", s),
686 path: out_dir.join(&format!("build/lib/linux/libclang_rt.{}-x86_64.a", s)),
687 name: format!("librustc-{}_rt.{}.a", channel, s),
691 "x86_64-fuchsia" => {
693 result.push(SanitizerRuntime {
694 cmake_target: format!("clang_rt.{}-x86_64", s),
695 path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-x86_64.a", s)),
696 name: format!("librustc-{}_rt.{}.a", channel, s),
700 "aarch64-fuchsia" => {
702 result.push(SanitizerRuntime {
703 cmake_target: format!("clang_rt.{}-aarch64", s),
704 path: out_dir.join(&format!("build/lib/fuchsia/libclang_rt.{}-aarch64.a", s)),
705 name: format!("librustc-{}_rt.{}.a", channel, s),
716 hash: Option<Vec<u8>>,
720 fn new(path: PathBuf, hash: Option<&str>) -> Self {
721 HashStamp { path, hash: hash.map(|s| s.as_bytes().to_owned()) }
724 fn is_done(&self) -> bool {
725 match fs::read(&self.path) {
726 Ok(h) => self.hash.as_deref().unwrap_or(b"") == h.as_slice(),
727 Err(e) if e.kind() == io::ErrorKind::NotFound => false,
729 panic!("failed to read stamp file `{}`: {}", self.path.display(), e);
734 fn remove(&self) -> io::Result<()> {
735 match fs::remove_file(&self.path) {
738 if e.kind() == io::ErrorKind::NotFound {
747 fn write(&self) -> io::Result<()> {
748 fs::write(&self.path, self.hash.as_deref().unwrap_or(b""))