1 //! Implementation of rustbuild, the Rust build system.
3 //! This module, and its descendants, are the implementation of the Rust build
4 //! system. Most of this build system is backed by Cargo but the outer layer
5 //! here serves as the ability to orchestrate calling Cargo, sequencing Cargo
6 //! builds, building artifacts like LLVM, etc. The goals of rustbuild are:
8 //! * To be an easily understandable, easily extensible, and maintainable build
10 //! * Leverage standard tools in the Rust ecosystem to build the compiler, aka
11 //! crates.io and Cargo.
12 //! * A standard interface to build across all platforms, including MSVC
16 //! The build system defers most of the complicated logic managing invocations
17 //! of rustc and rustdoc to Cargo itself. However, moving through various stages
18 //! and copying artifacts is still necessary for it to do. Each time rustbuild
19 //! is invoked, it will iterate through the list of predefined steps and execute
20 //! each serially in turn if it matches the paths passed or is a default rule.
21 //! For each step rustbuild relies on the step internally being incremental and
22 //! parallel. Note, though, that the `-j` parameter to rustbuild gets forwarded
23 //! to appropriate test harnesses and such.
25 //! Most of the "meaty" steps that matter are backed by Cargo, which does indeed
26 //! have its own parallelism and incremental management. Later steps, like
27 //! tests, aren't incremental and simply run the entire suite currently.
28 //! However, compiletest itself tries to avoid running tests when the artifacts
29 //! that are involved (mainly the compiler) haven't changed.
31 //! When you execute `x.py build`, the steps executed are:
33 //! * First, the python script is run. This will automatically download the
34 //! stage0 rustc and cargo according to `src/stage0.json`, or use the cached
35 //! versions if they're available. These are then used to compile rustbuild
36 //! itself (using Cargo). Finally, control is then transferred to rustbuild.
38 //! * Rustbuild takes over, performs sanity checks, probes the environment,
39 //! reads configuration, and starts executing steps as it reads the command
40 //! line arguments (paths) or going through the default rules.
42 //! The build output will be something like the following:
44 //! Building stage0 std artifacts
45 //! Copying stage0 std
46 //! Building stage0 test artifacts
47 //! Copying stage0 test
48 //! Building stage0 compiler artifacts
49 //! Copying stage0 rustc
50 //! Assembling stage1 compiler
51 //! Building stage1 std artifacts
52 //! Copying stage1 std
53 //! Building stage1 test artifacts
54 //! Copying stage1 test
55 //! Building stage1 compiler artifacts
56 //! Copying stage1 rustc
57 //! Assembling stage2 compiler
58 //! Uplifting stage1 std
59 //! Uplifting stage1 test
60 //! Uplifting stage1 rustc
62 //! Let's disect that a little:
64 //! ## Building stage0 {std,test,compiler} artifacts
66 //! These steps use the provided (downloaded, usually) compiler to compile the
67 //! local Rust source into libraries we can use.
69 //! ## Copying stage0 {std,test,rustc}
71 //! This copies the build output from Cargo into
72 //! `build/$HOST/stage0-sysroot/lib/rustlib/$ARCH/lib`. FIXME: this step's
73 //! documentation should be expanded -- the information already here may be
76 //! ## Assembling stage1 compiler
78 //! This copies the libraries we built in "building stage0 ... artifacts" into
79 //! the stage1 compiler's lib directory. These are the host libraries that the
80 //! compiler itself uses to run. These aren't actually used by artifacts the new
81 //! compiler generates. This step also copies the rustc and rustdoc binaries we
82 //! generated into build/$HOST/stage/bin.
84 //! The stage1/bin/rustc is a fully functional compiler, but it doesn't yet have
85 //! any libraries to link built binaries or libraries to. The next 3 steps will
86 //! provide those libraries for it; they are mostly equivalent to constructing
87 //! the stage1/bin compiler so we don't go through them individually.
89 //! ## Uplifting stage1 {std,test,rustc}
91 //! This step copies the libraries from the stage1 compiler sysroot into the
92 //! stage2 compiler. This is done to avoid rebuilding the compiler; libraries
93 //! we'd build in this step should be identical (in function, if not necessarily
94 //! identical on disk) so there's no need to recompile the compiler again. Note
95 //! that if you want to, you can enable the full-bootstrap option to change this
98 //! Each step is driven by a separate Cargo project and rustbuild orchestrates
99 //! copying files between steps and otherwise preparing for Cargo to run.
101 //! ## Further information
103 //! More documentation can be found in each respective module below, and you can
104 //! also check out the `src/bootstrap/README.md` file for more information.
106 use std::cell::{Cell, RefCell};
107 use std::collections::{HashMap, HashSet};
109 use std::fs::{self, File};
110 use std::path::{Path, PathBuf};
111 use std::process::{self, Command};
115 use std::os::unix::fs::symlink as symlink_file;
117 use std::os::windows::fs::symlink_file;
119 use filetime::FileTime;
121 use crate::builder::Kind;
122 use crate::config::{LlvmLibunwind, TargetSelection};
124 exe, libdir, mtime, output, run, run_suppressed, t, try_run, try_run_suppressed, CiEnv,
154 #[cfg(all(unix, not(target_os = "haiku")))]
156 pub unsafe fn setup(build: &mut crate::Build) {
157 if build.config.low_priority {
158 libc::setpriority(libc::PRIO_PGRP as _, 0, 10);
163 #[cfg(any(target_os = "haiku", target_os = "hermit", not(any(unix, windows))))]
165 pub unsafe fn setup(_build: &mut crate::Build) {}
168 use crate::cache::{Interned, INTERNER};
169 pub use crate::config::Config;
170 pub use crate::flags::Subcommand;
172 const LLVM_TOOLS: &[&str] = &[
173 "llvm-cov", // used to generate coverage report
174 "llvm-nm", // used to inspect binaries; it shows symbol names, their sizes and visibility
175 "llvm-objcopy", // used to transform ELFs into binary format which flashing tools consume
176 "llvm-objdump", // used to disassemble programs
177 "llvm-profdata", // used to inspect and merge files generated by profiles
178 "llvm-readobj", // used to get information from ELFs/objects that the other tools don't provide
179 "llvm-size", // used to prints the size of the linker sections of a program
180 "llvm-strip", // used to discard symbols from binary files to reduce their size
181 "llvm-ar", // used for creating and modifying archive files
182 "llvm-as", // used to convert LLVM assembly to LLVM bitcode
183 "llvm-dis", // used to disassemble LLVM bitcode
184 "llc", // used to compile LLVM bytecode
185 "opt", // used to optimize LLVM bytecode
188 pub const VERSION: usize = 2;
190 /// Extra --check-cfg to add when building
191 /// (Mode restriction, config name, config values (if any))
192 const EXTRA_CHECK_CFGS: &[(Option<Mode>, &'static str, Option<&[&'static str]>)] = &[
193 (None, "bootstrap", None),
194 (Some(Mode::Rustc), "parallel_compiler", None),
195 (Some(Mode::ToolRustc), "parallel_compiler", None),
196 (Some(Mode::Std), "stdarch_intel_sde", None),
197 (Some(Mode::Std), "no_fp_fmt_parse", None),
198 (Some(Mode::Std), "no_global_oom_handling", None),
199 (Some(Mode::Std), "freebsd12", None),
200 (Some(Mode::Std), "backtrace_in_libstd", None),
201 /* Extra values not defined in the built-in targets yet, but used in std */
202 (Some(Mode::Std), "target_env", Some(&["libnx"])),
203 (Some(Mode::Std), "target_os", Some(&["watchos"])),
207 Some(&["asmjs", "spirv", "nvptx", "nvptx64", "le32", "xtensa"]),
209 /* Extra names used by dependencies */
210 // FIXME: Used by rustfmt is their test but is invalid (neither cargo nor bootstrap ever set
211 // this config) should probably by removed or use a allow attribute.
212 (Some(Mode::ToolRustc), "release", None),
213 // FIXME: Used by stdarch in their test, should use a allow attribute instead.
214 (Some(Mode::Std), "dont_compile_me", None),
215 // FIXME: Used by serde_json, but we should not be triggering on external dependencies.
216 (Some(Mode::Rustc), "no_btreemap_remove_entry", None),
217 (Some(Mode::ToolRustc), "no_btreemap_remove_entry", None),
218 // FIXME: Used by crossbeam-utils, but we should not be triggering on external dependencies.
219 (Some(Mode::Rustc), "crossbeam_loom", None),
220 (Some(Mode::ToolRustc), "crossbeam_loom", None),
221 // FIXME: Used by proc-macro2, but we should not be triggering on external dependencies.
222 (Some(Mode::Rustc), "span_locations", None),
223 (Some(Mode::ToolRustc), "span_locations", None),
226 /// A structure representing a Rust compiler.
228 /// Each compiler has a `stage` that it is associated with and a `host` that
229 /// corresponds to the platform the compiler runs on. This structure is used as
230 /// a parameter to many methods below.
231 #[derive(Eq, PartialOrd, Ord, PartialEq, Clone, Copy, Hash, Debug)]
232 pub struct Compiler {
234 host: TargetSelection,
237 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
239 /// Run normal tests and doc tests (default).
241 /// Do not run any doc tests.
243 /// Only run doc tests.
252 /// Global configuration for the build system.
254 /// This structure transitively contains all configuration for the build system.
255 /// All filesystem-encoded configuration is in `config`, all flags are in
256 /// `flags`, and then parsed or probed information is listed in the keys below.
258 /// This structure is a parameter of almost all methods in the build system,
259 /// although most functions are implemented as free functions rather than
260 /// methods specifically on this structure itself (to make it easier to
263 /// User-specified configuration from `config.toml`.
266 // Version information
269 // Properties derived from the above configuration
272 bootstrap_out: PathBuf,
273 rust_info: channel::GitInfo,
274 cargo_info: channel::GitInfo,
275 rls_info: channel::GitInfo,
276 rust_analyzer_info: channel::GitInfo,
277 clippy_info: channel::GitInfo,
278 miri_info: channel::GitInfo,
279 rustfmt_info: channel::GitInfo,
280 in_tree_llvm_info: channel::GitInfo,
286 // Targets for which to build
287 build: TargetSelection,
288 hosts: Vec<TargetSelection>,
289 targets: Vec<TargetSelection>,
291 // Stage 0 (downloaded) compiler, lld and cargo or their local rust equivalents
292 initial_rustc: PathBuf,
293 initial_cargo: PathBuf,
294 initial_lld: PathBuf,
295 initial_libdir: PathBuf,
297 // Runtime state filled in later on
298 // C/C++ compilers and archiver for all targets
299 cc: HashMap<TargetSelection, cc::Tool>,
300 cxx: HashMap<TargetSelection, cc::Tool>,
301 ar: HashMap<TargetSelection, PathBuf>,
302 ranlib: HashMap<TargetSelection, PathBuf>,
304 crates: HashMap<Interned<String>, Crate>,
307 delayed_failures: RefCell<Vec<String>>,
308 prerelease_version: Cell<Option<u32>>,
310 RefCell<HashMap<TargetSelection, HashMap<String, (&'static str, PathBuf, Vec<String>)>>>,
315 name: Interned<String>,
316 deps: HashSet<Interned<String>>,
321 fn local_path(&self, build: &Build) -> PathBuf {
322 self.path.strip_prefix(&build.config.src).unwrap().into()
326 /// When building Rust various objects are handled differently.
327 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
328 pub enum DependencyType {
329 /// Libraries originating from proc-macros.
331 /// Typical Rust libraries.
333 /// Non Rust libraries and objects shipped to ease usage of certain targets.
337 /// The various "modes" of invoking Cargo.
339 /// These entries currently correspond to the various output directories of the
340 /// build system, with each mod generating output in a different directory.
341 #[derive(Debug, Hash, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
343 /// Build the standard library, placing output in the "stageN-std" directory.
346 /// Build librustc, and compiler libraries, placing output in the "stageN-rustc" directory.
349 /// Build a codegen backend for rustc, placing the output in the "stageN-codegen" directory.
352 /// Build a tool, placing output in the "stage0-bootstrap-tools"
353 /// directory. This is for miscellaneous sets of tools that are built
354 /// using the bootstrap stage0 compiler in its entirety (target libraries
355 /// and all). Typically these tools compile with stable Rust.
358 /// Build a tool which uses the locally built std, placing output in the
359 /// "stageN-tools" directory. Its usage is quite rare, mainly used by
360 /// compiletest which needs libtest.
363 /// Build a tool which uses the locally built rustc and the target std,
364 /// placing the output in the "stageN-tools" directory. This is used for
365 /// anything that needs a fully functional rustc, such as rustdoc, clippy,
366 /// cargo, rls, rustfmt, miri, etc.
371 pub fn is_tool(&self) -> bool {
372 matches!(self, Mode::ToolBootstrap | Mode::ToolRustc | Mode::ToolStd)
375 pub fn must_support_dlopen(&self) -> bool {
376 matches!(self, Mode::Std | Mode::Codegen)
386 /// Creates a new set of build configuration from the `flags` on the command
387 /// line and the filesystem `config`.
389 /// By default all build output will be placed in the current directory.
390 pub fn new(config: Config) -> Build {
391 let src = config.src.clone();
392 let out = config.out.clone();
394 let is_sudo = match env::var_os("SUDO_USER") {
395 Some(sudo_user) => match env::var_os("USER") {
396 Some(user) => user != sudo_user,
402 let ignore_git = config.ignore_git;
403 let rust_info = channel::GitInfo::new(ignore_git, &src);
404 let cargo_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/cargo"));
405 let rls_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/rls"));
406 let rust_analyzer_info =
407 channel::GitInfo::new(ignore_git, &src.join("src/tools/rust-analyzer"));
408 let clippy_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/clippy"));
409 let miri_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/miri"));
410 let rustfmt_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/rustfmt"));
412 // we always try to use git for LLVM builds
413 let in_tree_llvm_info = channel::GitInfo::new(false, &src.join("src/llvm-project"));
415 let initial_target_libdir_str = if config.dry_run {
416 "/dummy/lib/path/to/lib/".to_string()
419 Command::new(&config.initial_rustc)
421 .arg(config.build.rustc_target_arg())
423 .arg("target-libdir"),
426 let initial_target_dir = Path::new(&initial_target_libdir_str).parent().unwrap();
427 let initial_lld = initial_target_dir.join("bin").join("rust-lld");
429 let initial_sysroot = if config.dry_run {
432 output(Command::new(&config.initial_rustc).arg("--print").arg("sysroot"))
434 let initial_libdir = initial_target_dir
439 .strip_prefix(initial_sysroot.trim())
443 let version = std::fs::read_to_string(src.join("src").join("version"))
444 .expect("failed to read src/version");
445 let version = version.trim();
447 let bootstrap_out = if std::env::var("BOOTSTRAP_PYTHON").is_ok() {
448 out.join("bootstrap").join("debug")
450 let workspace_target_dir = std::env::var("CARGO_TARGET_DIR")
452 .unwrap_or_else(|_| src.join("target"));
453 let bootstrap_out = workspace_target_dir.join("debug");
454 if !bootstrap_out.join("rustc").exists() {
455 // this restriction can be lifted whenever https://github.com/rust-lang/rfcs/pull/3028 is implemented
456 panic!("run `cargo build --bins` before `cargo run`")
461 let mut build = Build {
462 initial_rustc: config.initial_rustc.clone(),
463 initial_cargo: config.initial_cargo.clone(),
466 local_rebuild: config.local_rebuild,
467 fail_fast: config.cmd.fail_fast(),
468 doc_tests: config.cmd.doc_tests(),
469 verbosity: config.verbose,
472 hosts: config.hosts.clone(),
473 targets: config.targets.clone(),
476 version: version.to_string(),
492 ranlib: HashMap::new(),
493 crates: HashMap::new(),
495 ci_env: CiEnv::current(),
496 delayed_failures: RefCell::new(Vec::new()),
497 prerelease_version: Cell::new(None),
498 tool_artifacts: Default::default(),
501 build.verbose("finding compilers");
502 cc_detect::find(&mut build);
503 // When running `setup`, the profile is about to change, so any requirements we have now may
504 // be different on the next invocation. Don't check for them until the next time x.py is
505 // run. This is ok because `setup` never runs any build commands, so it won't fail if commands are missing.
506 if !matches!(build.config.cmd, Subcommand::Setup { .. }) {
507 build.verbose("running sanity check");
508 sanity::check(&mut build);
511 // If local-rust is the same major.minor as the current version, then force a
513 let local_version_verbose =
514 output(Command::new(&build.initial_rustc).arg("--version").arg("--verbose"));
515 let local_release = local_version_verbose
517 .filter_map(|x| x.strip_prefix("release:"))
521 if local_release.split('.').take(2).eq(version.split('.').take(2)) {
522 build.verbose(&format!("auto-detected local-rebuild {}", local_release));
523 build.local_rebuild = true;
526 build.verbose("learning about cargo");
527 metadata::build(&mut build);
532 // modified from `check_submodule` and `update_submodule` in bootstrap.py
533 /// Given a path to the directory of a submodule, update it.
535 /// `relative_path` should be relative to the root of the git repository, not an absolute path.
536 pub(crate) fn update_submodule(&self, relative_path: &Path) {
537 fn dir_is_empty(dir: &Path) -> bool {
538 t!(std::fs::read_dir(dir)).next().is_none()
541 if !self.config.submodules(&self.rust_info) {
545 let absolute_path = self.config.src.join(relative_path);
547 // NOTE: The check for the empty directory is here because when running x.py the first time,
548 // the submodule won't be checked out. Check it out now so we can build it.
549 if !channel::GitInfo::new(false, &absolute_path).is_git() && !dir_is_empty(&absolute_path) {
554 if self.config.fast_submodules {
555 let checked_out_hash = output(
556 Command::new("git").args(&["rev-parse", "HEAD"]).current_dir(&absolute_path),
559 let recorded = output(
561 .args(&["ls-tree", "HEAD"])
563 .current_dir(&self.config.src),
565 let actual_hash = recorded
568 .unwrap_or_else(|| panic!("unexpected output `{}`", recorded));
571 if actual_hash == checked_out_hash.trim_end() {
572 // already checked out
577 println!("Updating submodule {}", relative_path.display());
580 .args(&["submodule", "-q", "sync"])
582 .current_dir(&self.config.src),
585 // Try passing `--progress` to start, then run git again without if that fails.
586 let update = |progress: bool| {
587 let mut git = Command::new("git");
588 git.args(&["submodule", "update", "--init", "--recursive", "--depth=1"]);
590 git.arg("--progress");
592 git.arg(relative_path).current_dir(&self.config.src);
595 // NOTE: doesn't use `try_run` because this shouldn't print an error if it fails.
596 if !update(true).status().map_or(false, |status| status.success()) {
597 self.run(&mut update(false));
600 self.run(Command::new("git").args(&["reset", "-q", "--hard"]).current_dir(&absolute_path));
601 self.run(Command::new("git").args(&["clean", "-qdfx"]).current_dir(absolute_path));
604 /// If any submodule has been initialized already, sync it unconditionally.
605 /// This avoids contributors checking in a submodule change by accident.
606 pub fn maybe_update_submodules(&self) {
607 // WARNING: keep this in sync with the submodules hard-coded in bootstrap.py
608 const BOOTSTRAP_SUBMODULES: &[&str] = &[
609 "src/tools/rust-installer",
616 // Avoid running git when there isn't a git checkout.
617 if !self.config.submodules(&self.rust_info) {
622 .args(&["config", "--file"])
623 .arg(&self.config.src.join(".gitmodules"))
624 .args(&["--get-regexp", "path"]),
626 for line in output.lines() {
627 // Look for `submodule.$name.path = $path`
628 // Sample output: `submodule.src/rust-installer.path src/tools/rust-installer`
629 let submodule = Path::new(line.splitn(2, ' ').nth(1).unwrap());
630 // avoid updating submodules twice
631 if !BOOTSTRAP_SUBMODULES.iter().any(|&p| Path::new(p) == submodule)
632 && channel::GitInfo::new(false, submodule).is_git()
634 self.update_submodule(submodule);
639 /// Executes the entire build, as configured by the flags and configuration.
640 pub fn build(&mut self) {
645 self.maybe_update_submodules();
647 if let Subcommand::Format { check, paths } = &self.config.cmd {
648 return format::format(self, *check, &paths);
651 if let Subcommand::Clean { all } = self.config.cmd {
652 return clean::clean(self, all);
655 if let Subcommand::Setup { profile } = &self.config.cmd {
656 return setup::setup(&self.config, *profile);
660 let builder = builder::Builder::new(&self);
661 if let Some(path) = builder.paths.get(0) {
662 if path == Path::new("nonexistent/path/to/trigger/cargo/metadata") {
668 if !self.config.dry_run {
670 self.config.dry_run = true;
671 let builder = builder::Builder::new(&self);
672 builder.execute_cli();
674 self.config.dry_run = false;
675 let builder = builder::Builder::new(&self);
676 builder.execute_cli();
678 let builder = builder::Builder::new(&self);
679 builder.execute_cli();
682 // Check for postponed failures from `test --no-fail-fast`.
683 let failures = self.delayed_failures.borrow();
684 if failures.len() > 0 {
685 println!("\n{} command(s) did not execute successfully:\n", failures.len());
686 for failure in failures.iter() {
687 println!(" - {}\n", failure);
693 /// Clear out `dir` if `input` is newer.
695 /// After this executes, it will also ensure that `dir` exists.
696 fn clear_if_dirty(&self, dir: &Path, input: &Path) -> bool {
697 let stamp = dir.join(".stamp");
698 let mut cleared = false;
699 if mtime(&stamp) < mtime(input) {
700 self.verbose(&format!("Dirty - {}", dir.display()));
701 let _ = fs::remove_dir_all(dir);
703 } else if stamp.exists() {
706 t!(fs::create_dir_all(dir));
707 t!(File::create(stamp));
711 /// Gets the space-separated set of activated features for the standard
713 fn std_features(&self, target: TargetSelection) -> String {
714 let mut features = "panic-unwind".to_string();
716 match self.config.llvm_libunwind {
717 LlvmLibunwind::InTree => features.push_str(" llvm-libunwind"),
718 LlvmLibunwind::System => features.push_str(" system-llvm-libunwind"),
719 LlvmLibunwind::No => {}
721 if self.config.backtrace {
722 features.push_str(" backtrace");
724 if self.config.profiler_enabled(target) {
725 features.push_str(" profiler");
730 /// Gets the space-separated set of activated features for the compiler.
731 fn rustc_features(&self, kind: Kind) -> String {
732 let mut features = String::new();
733 if self.config.jemalloc {
734 features.push_str("jemalloc");
736 if self.config.llvm_enabled() || kind == Kind::Check {
737 features.push_str(" llvm");
740 // If debug logging is on, then we want the default for tracing:
741 // https://github.com/tokio-rs/tracing/blob/3dd5c03d907afdf2c39444a29931833335171554/tracing/src/level_filters.rs#L26
742 // which is everything (including debug/trace/etc.)
743 // if its unset, if debug_assertions is on, then debug_logging will also be on
744 // as well as tracing *ignoring* this feature when debug_assertions is on
745 if !self.config.rust_debug_logging {
746 features.push_str(" max_level_info");
752 /// Component directory that Cargo will produce output into (e.g.
754 fn cargo_dir(&self) -> &'static str {
755 if self.config.rust_optimize { "release" } else { "debug" }
758 fn tools_dir(&self, compiler: Compiler) -> PathBuf {
761 .join(&*compiler.host.triple)
762 .join(format!("stage{}-tools-bin", compiler.stage));
763 t!(fs::create_dir_all(&out));
767 /// Returns the root directory for all output generated in a particular
768 /// stage when running with a particular host compiler.
770 /// The mode indicates what the root directory is for.
771 fn stage_out(&self, compiler: Compiler, mode: Mode) -> PathBuf {
772 let suffix = match mode {
774 Mode::Rustc => "-rustc",
775 Mode::Codegen => "-codegen",
776 Mode::ToolBootstrap => "-bootstrap-tools",
777 Mode::ToolStd | Mode::ToolRustc => "-tools",
779 self.out.join(&*compiler.host.triple).join(format!("stage{}{}", compiler.stage, suffix))
782 /// Returns the root output directory for all Cargo output in a given stage,
783 /// running a particular compiler, whether or not we're building the
784 /// standard library, and targeting the specified architecture.
785 fn cargo_out(&self, compiler: Compiler, mode: Mode, target: TargetSelection) -> PathBuf {
786 self.stage_out(compiler, mode).join(&*target.triple).join(self.cargo_dir())
789 /// Root output directory for LLVM compiled for `target`
791 /// Note that if LLVM is configured externally then the directory returned
792 /// will likely be empty.
793 fn llvm_out(&self, target: TargetSelection) -> PathBuf {
794 self.out.join(&*target.triple).join("llvm")
797 fn lld_out(&self, target: TargetSelection) -> PathBuf {
798 self.out.join(&*target.triple).join("lld")
801 /// Output directory for all documentation for a target
802 fn doc_out(&self, target: TargetSelection) -> PathBuf {
803 self.out.join(&*target.triple).join("doc")
806 fn test_out(&self, target: TargetSelection) -> PathBuf {
807 self.out.join(&*target.triple).join("test")
810 /// Output directory for all documentation for a target
811 fn compiler_doc_out(&self, target: TargetSelection) -> PathBuf {
812 self.out.join(&*target.triple).join("compiler-doc")
815 /// Output directory for some generated md crate documentation for a target (temporary)
816 fn md_doc_out(&self, target: TargetSelection) -> Interned<PathBuf> {
817 INTERNER.intern_path(self.out.join(&*target.triple).join("md-doc"))
820 /// Returns `true` if no custom `llvm-config` is set for the specified target.
822 /// If no custom `llvm-config` was specified then Rust's llvm will be used.
823 fn is_rust_llvm(&self, target: TargetSelection) -> bool {
824 if self.config.llvm_from_ci && target == self.config.build {
828 match self.config.target_config.get(&target) {
829 Some(ref c) => c.llvm_config.is_none(),
834 /// Returns the path to `FileCheck` binary for the specified target
835 fn llvm_filecheck(&self, target: TargetSelection) -> PathBuf {
836 let target_config = self.config.target_config.get(&target);
837 if let Some(s) = target_config.and_then(|c| c.llvm_filecheck.as_ref()) {
839 } else if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
840 let llvm_bindir = output(Command::new(s).arg("--bindir"));
841 let filecheck = Path::new(llvm_bindir.trim()).join(exe("FileCheck", target));
842 if filecheck.exists() {
845 // On Fedora the system LLVM installs FileCheck in the
846 // llvm subdirectory of the libdir.
847 let llvm_libdir = output(Command::new(s).arg("--libdir"));
849 Path::new(llvm_libdir.trim()).join("llvm").join(exe("FileCheck", target));
850 if lib_filecheck.exists() {
853 // Return the most normal file name, even though
854 // it doesn't exist, so that any error message
860 let base = self.llvm_out(self.config.build).join("build");
861 let base = if !self.ninja() && self.config.build.contains("msvc") {
862 if self.config.llvm_optimize {
863 if self.config.llvm_release_debuginfo {
864 base.join("RelWithDebInfo")
874 base.join("bin").join(exe("FileCheck", target))
878 /// Directory for libraries built from C/C++ code and shared between stages.
879 fn native_dir(&self, target: TargetSelection) -> PathBuf {
880 self.out.join(&*target.triple).join("native")
883 /// Root output directory for rust_test_helpers library compiled for
885 fn test_helpers_out(&self, target: TargetSelection) -> PathBuf {
886 self.native_dir(target).join("rust-test-helpers")
889 /// Adds the `RUST_TEST_THREADS` env var if necessary
890 fn add_rust_test_threads(&self, cmd: &mut Command) {
891 if env::var_os("RUST_TEST_THREADS").is_none() {
892 cmd.env("RUST_TEST_THREADS", self.jobs().to_string());
896 /// Returns the libdir of the snapshot compiler.
897 fn rustc_snapshot_libdir(&self) -> PathBuf {
898 self.rustc_snapshot_sysroot().join(libdir(self.config.build))
901 /// Returns the sysroot of the snapshot compiler.
902 fn rustc_snapshot_sysroot(&self) -> &Path {
903 self.initial_rustc.parent().unwrap().parent().unwrap()
906 /// Runs a command, printing out nice contextual information if it fails.
907 fn run(&self, cmd: &mut Command) {
908 if self.config.dry_run {
911 self.verbose(&format!("running: {:?}", cmd));
912 run(cmd, self.is_verbose())
915 /// Runs a command, printing out nice contextual information if it fails.
916 fn run_quiet(&self, cmd: &mut Command) {
917 if self.config.dry_run {
920 self.verbose(&format!("running: {:?}", cmd));
924 /// Runs a command, printing out nice contextual information if it fails.
925 /// Exits if the command failed to execute at all, otherwise returns its
926 /// `status.success()`.
927 fn try_run(&self, cmd: &mut Command) -> bool {
928 if self.config.dry_run {
931 self.verbose(&format!("running: {:?}", cmd));
932 try_run(cmd, self.is_verbose())
935 /// Runs a command, printing out nice contextual information if it fails.
936 /// Exits if the command failed to execute at all, otherwise returns its
937 /// `status.success()`.
938 fn try_run_quiet(&self, cmd: &mut Command) -> bool {
939 if self.config.dry_run {
942 self.verbose(&format!("running: {:?}", cmd));
943 try_run_suppressed(cmd)
946 pub fn is_verbose(&self) -> bool {
950 /// Prints a message if this build is configured in verbose mode.
951 fn verbose(&self, msg: &str) {
952 if self.is_verbose() {
957 pub fn is_verbose_than(&self, level: usize) -> bool {
958 self.verbosity > level
961 /// Prints a message if this build is configured in more verbose mode than `level`.
962 fn verbose_than(&self, level: usize, msg: &str) {
963 if self.is_verbose_than(level) {
968 fn info(&self, msg: &str) {
969 if self.config.dry_run {
975 /// Returns the number of parallel jobs that have been configured for this
977 fn jobs(&self) -> u32 {
978 self.config.jobs.unwrap_or_else(|| {
979 std::thread::available_parallelism().map_or(1, std::num::NonZeroUsize::get) as u32
983 fn debuginfo_map_to(&self, which: GitRepo) -> Option<String> {
984 if !self.config.rust_remap_debuginfo {
990 let sha = self.rust_sha().unwrap_or(&self.version);
991 Some(format!("/rustc/{}", sha))
993 GitRepo::Llvm => Some(String::from("/rustc/llvm")),
997 /// Returns the path to the C compiler for the target specified.
998 fn cc(&self, target: TargetSelection) -> &Path {
999 self.cc[&target].path()
1002 /// Returns a list of flags to pass to the C compiler for the target
1004 fn cflags(&self, target: TargetSelection, which: GitRepo, c: CLang) -> Vec<String> {
1005 let base = match c {
1006 CLang::C => &self.cc[&target],
1007 CLang::Cxx => &self.cxx[&target],
1010 // Filter out -O and /O (the optimization flags) that we picked up from
1011 // cc-rs because the build scripts will determine that for themselves.
1015 .map(|s| s.to_string_lossy().into_owned())
1016 .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
1017 .collect::<Vec<String>>();
1019 // If we're compiling on macOS then we add a few unconditional flags
1020 // indicating that we want libc++ (more filled out than libstdc++) and
1021 // we want to compile for 10.7. This way we can ensure that
1022 // LLVM/etc are all properly compiled.
1023 if target.contains("apple-darwin") {
1024 base.push("-stdlib=libc++".into());
1027 // Work around an apparently bad MinGW / GCC optimization,
1028 // See: https://lists.llvm.org/pipermail/cfe-dev/2016-December/051980.html
1029 // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78936
1030 if &*target.triple == "i686-pc-windows-gnu" {
1031 base.push("-fno-omit-frame-pointer".into());
1034 if let Some(map_to) = self.debuginfo_map_to(which) {
1035 let map = format!("{}={}", self.src.display(), map_to);
1036 let cc = self.cc(target);
1037 if cc.ends_with("clang") || cc.ends_with("gcc") {
1038 base.push(format!("-fdebug-prefix-map={}", map));
1039 } else if cc.ends_with("clang-cl.exe") {
1040 base.push("-Xclang".into());
1041 base.push(format!("-fdebug-prefix-map={}", map));
1047 /// Returns the path to the `ar` archive utility for the target specified.
1048 fn ar(&self, target: TargetSelection) -> Option<&Path> {
1049 self.ar.get(&target).map(|p| &**p)
1052 /// Returns the path to the `ranlib` utility for the target specified.
1053 fn ranlib(&self, target: TargetSelection) -> Option<&Path> {
1054 self.ranlib.get(&target).map(|p| &**p)
1057 /// Returns the path to the C++ compiler for the target specified.
1058 fn cxx(&self, target: TargetSelection) -> Result<&Path, String> {
1059 match self.cxx.get(&target) {
1060 Some(p) => Ok(p.path()),
1062 Err(format!("target `{}` is not configured as a host, only as a target", target))
1067 /// Returns the path to the linker for the given target if it needs to be overridden.
1068 fn linker(&self, target: TargetSelection) -> Option<&Path> {
1069 if let Some(linker) = self.config.target_config.get(&target).and_then(|c| c.linker.as_ref())
1072 } else if target.contains("vxworks") {
1073 // need to use CXX compiler as linker to resolve the exception functions
1074 // that are only existed in CXX libraries
1075 Some(self.cxx[&target].path())
1076 } else if target != self.config.build
1077 && util::use_host_linker(target)
1078 && !target.contains("msvc")
1080 Some(self.cc(target))
1081 } else if self.config.use_lld && !self.is_fuse_ld_lld(target) && self.build == target {
1082 Some(&self.initial_lld)
1088 // LLD is used through `-fuse-ld=lld` rather than directly.
1089 // Only MSVC targets use LLD directly at the moment.
1090 fn is_fuse_ld_lld(&self, target: TargetSelection) -> bool {
1091 self.config.use_lld && !target.contains("msvc")
1094 fn lld_flags(&self, target: TargetSelection) -> impl Iterator<Item = String> {
1095 let mut options = [None, None];
1097 if self.config.use_lld {
1098 if self.is_fuse_ld_lld(target) {
1099 options[0] = Some("-Clink-arg=-fuse-ld=lld".to_string());
1102 let threads = if target.contains("windows") { "/threads:1" } else { "--threads=1" };
1103 options[1] = Some(format!("-Clink-arg=-Wl,{}", threads));
1106 IntoIterator::into_iter(options).flatten()
1109 /// Returns if this target should statically link the C runtime, if specified
1110 fn crt_static(&self, target: TargetSelection) -> Option<bool> {
1111 if target.contains("pc-windows-msvc") {
1114 self.config.target_config.get(&target).and_then(|t| t.crt_static)
1118 /// Returns the "musl root" for this `target`, if defined
1119 fn musl_root(&self, target: TargetSelection) -> Option<&Path> {
1123 .and_then(|t| t.musl_root.as_ref())
1124 .or_else(|| self.config.musl_root.as_ref())
1128 /// Returns the "musl libdir" for this `target`.
1129 fn musl_libdir(&self, target: TargetSelection) -> Option<PathBuf> {
1130 let t = self.config.target_config.get(&target)?;
1131 if let libdir @ Some(_) = &t.musl_libdir {
1132 return libdir.clone();
1134 self.musl_root(target).map(|root| root.join("lib"))
1137 /// Returns the sysroot for the wasi target, if defined
1138 fn wasi_root(&self, target: TargetSelection) -> Option<&Path> {
1139 self.config.target_config.get(&target).and_then(|t| t.wasi_root.as_ref()).map(|p| &**p)
1142 /// Returns `true` if this is a no-std `target`, if defined
1143 fn no_std(&self, target: TargetSelection) -> Option<bool> {
1144 self.config.target_config.get(&target).map(|t| t.no_std)
1147 /// Returns `true` if the target will be tested using the `remote-test-client`
1148 /// and `remote-test-server` binaries.
1149 fn remote_tested(&self, target: TargetSelection) -> bool {
1150 self.qemu_rootfs(target).is_some()
1151 || target.contains("android")
1152 || env::var_os("TEST_DEVICE_ADDR").is_some()
1155 /// Returns the root of the "rootfs" image that this target will be using,
1156 /// if one was configured.
1158 /// If `Some` is returned then that means that tests for this target are
1159 /// emulated with QEMU and binaries will need to be shipped to the emulator.
1160 fn qemu_rootfs(&self, target: TargetSelection) -> Option<&Path> {
1161 self.config.target_config.get(&target).and_then(|t| t.qemu_rootfs.as_ref()).map(|p| &**p)
1164 /// Path to the python interpreter to use
1165 fn python(&self) -> &Path {
1166 self.config.python.as_ref().unwrap()
1169 /// Temporary directory that extended error information is emitted to.
1170 fn extended_error_dir(&self) -> PathBuf {
1171 self.out.join("tmp/extended-error-metadata")
1174 /// Tests whether the `compiler` compiling for `target` should be forced to
1175 /// use a stage1 compiler instead.
1177 /// Currently, by default, the build system does not perform a "full
1178 /// bootstrap" by default where we compile the compiler three times.
1179 /// Instead, we compile the compiler two times. The final stage (stage2)
1180 /// just copies the libraries from the previous stage, which is what this
1183 /// Here we return `true` if:
1185 /// * The build isn't performing a full bootstrap
1186 /// * The `compiler` is in the final stage, 2
1187 /// * We're not cross-compiling, so the artifacts are already available in
1190 /// When all of these conditions are met the build will lift artifacts from
1191 /// the previous stage forward.
1192 fn force_use_stage1(&self, compiler: Compiler, target: TargetSelection) -> bool {
1193 !self.config.full_bootstrap
1194 && compiler.stage >= 2
1195 && (self.hosts.iter().any(|h| *h == target) || target == self.build)
1198 /// Given `num` in the form "a.b.c" return a "release string" which
1199 /// describes the release version number.
1201 /// For example on nightly this returns "a.b.c-nightly", on beta it returns
1202 /// "a.b.c-beta.1" and on stable it just returns "a.b.c".
1203 fn release(&self, num: &str) -> String {
1204 match &self.config.channel[..] {
1205 "stable" => num.to_string(),
1207 if self.rust_info.is_git() && !self.config.ignore_git {
1208 format!("{}-beta.{}", num, self.beta_prerelease_version())
1210 format!("{}-beta", num)
1213 "nightly" => format!("{}-nightly", num),
1214 _ => format!("{}-dev", num),
1218 fn beta_prerelease_version(&self) -> u32 {
1219 if let Some(s) = self.prerelease_version.get() {
1223 // Figure out how many merge commits happened since we branched off master.
1224 // That's our beta number!
1225 // (Note that we use a `..` range, not the `...` symmetric difference.)
1231 .arg("refs/remotes/origin/master..HEAD")
1232 .current_dir(&self.src),
1234 let n = count.trim().parse().unwrap();
1235 self.prerelease_version.set(Some(n));
1239 /// Returns the value of `release` above for Rust itself.
1240 fn rust_release(&self) -> String {
1241 self.release(&self.version)
1244 /// Returns the "package version" for a component given the `num` release
1247 /// The package version is typically what shows up in the names of tarballs.
1248 /// For channels like beta/nightly it's just the channel name, otherwise
1249 /// it's the `num` provided.
1250 fn package_vers(&self, num: &str) -> String {
1251 match &self.config.channel[..] {
1252 "stable" => num.to_string(),
1253 "beta" => "beta".to_string(),
1254 "nightly" => "nightly".to_string(),
1255 _ => format!("{}-dev", num),
1259 /// Returns the value of `package_vers` above for Rust itself.
1260 fn rust_package_vers(&self) -> String {
1261 self.package_vers(&self.version)
1264 fn llvm_link_tools_dynamically(&self, target: TargetSelection) -> bool {
1265 target.contains("linux-gnu") || target.contains("apple-darwin")
1268 /// Returns the `version` string associated with this compiler for Rust
1271 /// Note that this is a descriptive string which includes the commit date,
1272 /// sha, version, etc.
1273 fn rust_version(&self) -> String {
1274 let mut version = self.rust_info.version(self, &self.version);
1275 if let Some(ref s) = self.config.description {
1276 version.push_str(" (");
1277 version.push_str(s);
1283 /// Returns the full commit hash.
1284 fn rust_sha(&self) -> Option<&str> {
1285 self.rust_info.sha()
1288 /// Returns the `a.b.c` version that the given package is at.
1289 fn release_num(&self, package: &str) -> String {
1290 let toml_file_name = self.src.join(&format!("src/tools/{}/Cargo.toml", package));
1291 let toml = t!(fs::read_to_string(&toml_file_name));
1292 for line in toml.lines() {
1293 if let Some(stripped) =
1294 line.strip_prefix("version = \"").and_then(|s| s.strip_suffix("\""))
1296 return stripped.to_owned();
1300 panic!("failed to find version in {}'s Cargo.toml", package)
1303 /// Returns `true` if unstable features should be enabled for the compiler
1305 fn unstable_features(&self) -> bool {
1306 match &self.config.channel[..] {
1307 "stable" | "beta" => false,
1308 "nightly" | _ => true,
1312 /// Returns a Vec of all the dependencies of the given root crate,
1313 /// including transitive dependencies and the root itself. Only includes
1314 /// "local" crates (those in the local source tree, not from a registry).
1315 fn in_tree_crates(&self, root: &str, target: Option<TargetSelection>) -> Vec<&Crate> {
1316 let mut ret = Vec::new();
1317 let mut list = vec![INTERNER.intern_str(root)];
1318 let mut visited = HashSet::new();
1319 while let Some(krate) = list.pop() {
1320 let krate = &self.crates[&krate];
1322 for dep in &krate.deps {
1323 if !self.crates.contains_key(dep) {
1324 // Ignore non-workspace members.
1327 // Don't include optional deps if their features are not
1328 // enabled. Ideally this would be computed from `cargo
1329 // metadata --features …`, but that is somewhat slow. In
1330 // the future, we may want to consider just filtering all
1331 // build and dev dependencies in metadata::build.
1332 if visited.insert(dep)
1333 && (dep != "profiler_builtins"
1335 .map(|t| self.config.profiler_enabled(t))
1336 .unwrap_or_else(|| self.config.any_profiler_enabled()))
1337 && (dep != "rustc_codegen_llvm" || self.config.llvm_enabled())
1346 fn read_stamp_file(&self, stamp: &Path) -> Vec<(PathBuf, DependencyType)> {
1347 if self.config.dry_run {
1351 let mut paths = Vec::new();
1352 let contents = t!(fs::read(stamp), &stamp);
1353 // This is the method we use for extracting paths from the stamp file passed to us. See
1354 // run_cargo for more information (in compile.rs).
1355 for part in contents.split(|b| *b == 0) {
1356 if part.is_empty() {
1359 let dependency_type = match part[0] as char {
1360 'h' => DependencyType::Host,
1361 's' => DependencyType::TargetSelfContained,
1362 't' => DependencyType::Target,
1363 _ => unreachable!(),
1365 let path = PathBuf::from(t!(str::from_utf8(&part[1..])));
1366 paths.push((path, dependency_type));
1371 /// Copies a file from `src` to `dst`
1372 pub fn copy(&self, src: &Path, dst: &Path) {
1373 if self.config.dry_run {
1376 self.verbose_than(1, &format!("Copy {:?} to {:?}", src, dst));
1380 let _ = fs::remove_file(&dst);
1381 let metadata = t!(src.symlink_metadata());
1382 if metadata.file_type().is_symlink() {
1383 let link = t!(fs::read_link(src));
1384 t!(symlink_file(link, dst));
1385 } else if let Ok(()) = fs::hard_link(src, dst) {
1386 // Attempt to "easy copy" by creating a hard link
1387 // (symlinks don't work on windows), but if that fails
1388 // just fall back to a slow `copy` operation.
1390 if let Err(e) = fs::copy(src, dst) {
1391 panic!("failed to copy `{}` to `{}`: {}", src.display(), dst.display(), e)
1393 t!(fs::set_permissions(dst, metadata.permissions()));
1394 let atime = FileTime::from_last_access_time(&metadata);
1395 let mtime = FileTime::from_last_modification_time(&metadata);
1396 t!(filetime::set_file_times(dst, atime, mtime));
1400 /// Copies the `src` directory recursively to `dst`. Both are assumed to exist
1401 /// when this function is called.
1402 pub fn cp_r(&self, src: &Path, dst: &Path) {
1403 if self.config.dry_run {
1406 for f in self.read_dir(src) {
1407 let path = f.path();
1408 let name = path.file_name().unwrap();
1409 let dst = dst.join(name);
1410 if t!(f.file_type()).is_dir() {
1411 t!(fs::create_dir_all(&dst));
1412 self.cp_r(&path, &dst);
1414 let _ = fs::remove_file(&dst);
1415 self.copy(&path, &dst);
1420 /// Copies the `src` directory recursively to `dst`. Both are assumed to exist
1421 /// when this function is called. Unwanted files or directories can be skipped
1422 /// by returning `false` from the filter function.
1423 pub fn cp_filtered(&self, src: &Path, dst: &Path, filter: &dyn Fn(&Path) -> bool) {
1424 // Immediately recurse with an empty relative path
1425 self.recurse_(src, dst, Path::new(""), filter)
1428 // Inner function does the actual work
1429 fn recurse_(&self, src: &Path, dst: &Path, relative: &Path, filter: &dyn Fn(&Path) -> bool) {
1430 for f in self.read_dir(src) {
1431 let path = f.path();
1432 let name = path.file_name().unwrap();
1433 let dst = dst.join(name);
1434 let relative = relative.join(name);
1435 // Only copy file or directory if the filter function returns true
1436 if filter(&relative) {
1437 if t!(f.file_type()).is_dir() {
1438 let _ = fs::remove_dir_all(&dst);
1439 self.create_dir(&dst);
1440 self.recurse_(&path, &dst, &relative, filter);
1442 let _ = fs::remove_file(&dst);
1443 self.copy(&path, &dst);
1449 fn copy_to_folder(&self, src: &Path, dest_folder: &Path) {
1450 let file_name = src.file_name().unwrap();
1451 let dest = dest_folder.join(file_name);
1452 self.copy(src, &dest);
1455 fn install(&self, src: &Path, dstdir: &Path, perms: u32) {
1456 if self.config.dry_run {
1459 let dst = dstdir.join(src.file_name().unwrap());
1460 self.verbose_than(1, &format!("Install {:?} to {:?}", src, dst));
1461 t!(fs::create_dir_all(dstdir));
1462 drop(fs::remove_file(&dst));
1465 panic!("Error: File \"{}\" not found!", src.display());
1467 let metadata = t!(src.symlink_metadata());
1468 if let Err(e) = fs::copy(&src, &dst) {
1469 panic!("failed to copy `{}` to `{}`: {}", src.display(), dst.display(), e)
1471 t!(fs::set_permissions(&dst, metadata.permissions()));
1472 let atime = FileTime::from_last_access_time(&metadata);
1473 let mtime = FileTime::from_last_modification_time(&metadata);
1474 t!(filetime::set_file_times(&dst, atime, mtime));
1479 fn create(&self, path: &Path, s: &str) {
1480 if self.config.dry_run {
1483 t!(fs::write(path, s));
1486 fn read(&self, path: &Path) -> String {
1487 if self.config.dry_run {
1488 return String::new();
1490 t!(fs::read_to_string(path))
1493 fn create_dir(&self, dir: &Path) {
1494 if self.config.dry_run {
1497 t!(fs::create_dir_all(dir))
1500 fn remove_dir(&self, dir: &Path) {
1501 if self.config.dry_run {
1504 t!(fs::remove_dir_all(dir))
1507 fn read_dir(&self, dir: &Path) -> impl Iterator<Item = fs::DirEntry> {
1508 let iter = match fs::read_dir(dir) {
1510 Err(_) if self.config.dry_run => return vec![].into_iter(),
1511 Err(err) => panic!("could not read dir {:?}: {:?}", dir, err),
1513 iter.map(|e| t!(e)).collect::<Vec<_>>().into_iter()
1516 fn remove(&self, f: &Path) {
1517 if self.config.dry_run {
1520 fs::remove_file(f).unwrap_or_else(|_| panic!("failed to remove {:?}", f));
1523 /// Returns if config.ninja is enabled, and checks for ninja existence,
1524 /// exiting with a nicer error message if not.
1525 fn ninja(&self) -> bool {
1526 let mut cmd_finder = crate::sanity::Finder::new();
1528 if self.config.ninja_in_file {
1529 // Some Linux distros rename `ninja` to `ninja-build`.
1530 // CMake can work with either binary name.
1531 if cmd_finder.maybe_have("ninja-build").is_none()
1532 && cmd_finder.maybe_have("ninja").is_none()
1536 Couldn't find required command: ninja (or ninja-build)
1538 You should install ninja as described at
1539 <https://github.com/ninja-build/ninja/wiki/Pre-built-Ninja-packages>,
1540 or set `ninja = false` in the `[llvm]` section of `config.toml`.
1541 Alternatively, set `download-ci-llvm = true` in that `[llvm]` section
1542 to download LLVM rather than building it.
1545 std::process::exit(1);
1549 // If ninja isn't enabled but we're building for MSVC then we try
1550 // doubly hard to enable it. It was realized in #43767 that the msbuild
1551 // CMake generator for MSVC doesn't respect configuration options like
1552 // disabling LLVM assertions, which can often be quite important!
1554 // In these cases we automatically enable Ninja if we find it in the
1556 if !self.config.ninja_in_file && self.config.build.contains("msvc") {
1557 if cmd_finder.maybe_have("ninja").is_some() {
1562 self.config.ninja_in_file
1567 fn chmod(path: &Path, perms: u32) {
1568 use std::os::unix::fs::*;
1569 t!(fs::set_permissions(path, fs::Permissions::from_mode(perms)));
1572 fn chmod(_path: &Path, _perms: u32) {}
1575 pub fn with_stage(mut self, stage: u32) -> Compiler {
1580 /// Returns `true` if this is a snapshot compiler for `build`'s configuration
1581 pub fn is_snapshot(&self, build: &Build) -> bool {
1582 self.stage == 0 && self.host == build.build
1585 /// Returns if this compiler should be treated as a final stage one in the
1586 /// current build session.
1587 /// This takes into account whether we're performing a full bootstrap or
1588 /// not; don't directly compare the stage with `2`!
1589 pub fn is_final_stage(&self, build: &Build) -> bool {
1590 let final_stage = if build.config.full_bootstrap { 2 } else { 1 };
1591 self.stage >= final_stage
1595 fn envify(s: &str) -> String {
1601 .flat_map(|c| c.to_uppercase())