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;
120 use once_cell::sync::OnceCell;
121 use serde::Deserialize;
123 use crate::builder::Kind;
124 use crate::config::{LlvmLibunwind, TargetSelection};
126 check_run, exe, libdir, mtime, output, run, run_suppressed, t, try_run, try_run_suppressed,
154 #[cfg(feature = "build-metrics")]
160 #[cfg(all(unix, not(target_os = "haiku")))]
162 pub unsafe fn setup(build: &mut crate::Build) {
163 if build.config.low_priority {
164 libc::setpriority(libc::PRIO_PGRP as _, 0, 10);
169 #[cfg(any(target_os = "haiku", target_os = "hermit", not(any(unix, windows))))]
171 pub unsafe fn setup(_build: &mut crate::Build) {}
174 use crate::cache::{Interned, INTERNER};
175 pub use crate::config::Config;
176 pub use crate::flags::Subcommand;
178 const LLVM_TOOLS: &[&str] = &[
179 "llvm-cov", // used to generate coverage report
180 "llvm-nm", // used to inspect binaries; it shows symbol names, their sizes and visibility
181 "llvm-objcopy", // used to transform ELFs into binary format which flashing tools consume
182 "llvm-objdump", // used to disassemble programs
183 "llvm-profdata", // used to inspect and merge files generated by profiles
184 "llvm-readobj", // used to get information from ELFs/objects that the other tools don't provide
185 "llvm-size", // used to prints the size of the linker sections of a program
186 "llvm-strip", // used to discard symbols from binary files to reduce their size
187 "llvm-ar", // used for creating and modifying archive files
188 "llvm-as", // used to convert LLVM assembly to LLVM bitcode
189 "llvm-dis", // used to disassemble LLVM bitcode
190 "llc", // used to compile LLVM bytecode
191 "opt", // used to optimize LLVM bytecode
194 pub const VERSION: usize = 2;
196 /// Extra --check-cfg to add when building
197 /// (Mode restriction, config name, config values (if any))
198 const EXTRA_CHECK_CFGS: &[(Option<Mode>, &'static str, Option<&[&'static str]>)] = &[
199 (None, "bootstrap", None),
200 (Some(Mode::Rustc), "parallel_compiler", None),
201 (Some(Mode::ToolRustc), "parallel_compiler", None),
202 (Some(Mode::Std), "stdarch_intel_sde", None),
203 (Some(Mode::Std), "no_fp_fmt_parse", None),
204 (Some(Mode::Std), "no_global_oom_handling", None),
205 (Some(Mode::Std), "freebsd12", None),
206 (Some(Mode::Std), "backtrace_in_libstd", None),
207 /* Extra values not defined in the built-in targets yet, but used in std */
208 (Some(Mode::Std), "target_env", Some(&["libnx"])),
209 (Some(Mode::Std), "target_os", Some(&["watchos"])),
213 Some(&["asmjs", "spirv", "nvptx", "nvptx64", "le32", "xtensa"]),
215 /* Extra names used by dependencies */
216 // FIXME: Used by rustfmt is their test but is invalid (neither cargo nor bootstrap ever set
217 // this config) should probably by removed or use a allow attribute.
218 (Some(Mode::ToolRustc), "release", None),
219 // FIXME: Used by stdarch in their test, should use a allow attribute instead.
220 (Some(Mode::Std), "dont_compile_me", None),
221 // FIXME: Used by serde_json, but we should not be triggering on external dependencies.
222 (Some(Mode::Rustc), "no_btreemap_remove_entry", None),
223 (Some(Mode::ToolRustc), "no_btreemap_remove_entry", None),
224 // FIXME: Used by crossbeam-utils, but we should not be triggering on external dependencies.
225 (Some(Mode::Rustc), "crossbeam_loom", None),
226 (Some(Mode::ToolRustc), "crossbeam_loom", None),
227 // FIXME: Used by proc-macro2, but we should not be triggering on external dependencies.
228 (Some(Mode::Rustc), "span_locations", None),
229 (Some(Mode::ToolRustc), "span_locations", None),
232 /// A structure representing a Rust compiler.
234 /// Each compiler has a `stage` that it is associated with and a `host` that
235 /// corresponds to the platform the compiler runs on. This structure is used as
236 /// a parameter to many methods below.
237 #[derive(Eq, PartialOrd, Ord, PartialEq, Clone, Copy, Hash, Debug)]
238 pub struct Compiler {
240 host: TargetSelection,
243 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
245 /// Run normal tests and doc tests (default).
247 /// Do not run any doc tests.
249 /// Only run doc tests.
258 /// Global configuration for the build system.
260 /// This structure transitively contains all configuration for the build system.
261 /// All filesystem-encoded configuration is in `config`, all flags are in
262 /// `flags`, and then parsed or probed information is listed in the keys below.
264 /// This structure is a parameter of almost all methods in the build system,
265 /// although most functions are implemented as free functions rather than
266 /// methods specifically on this structure itself (to make it easier to
269 /// User-specified configuration from `config.toml`.
272 // Version information
275 // Properties derived from the above configuration
278 bootstrap_out: PathBuf,
279 rust_info: channel::GitInfo,
280 cargo_info: channel::GitInfo,
281 rls_info: channel::GitInfo,
282 rust_analyzer_info: channel::GitInfo,
283 clippy_info: channel::GitInfo,
284 miri_info: channel::GitInfo,
285 rustfmt_info: channel::GitInfo,
286 in_tree_llvm_info: channel::GitInfo,
292 // Targets for which to build
293 build: TargetSelection,
294 hosts: Vec<TargetSelection>,
295 targets: Vec<TargetSelection>,
297 // Stage 0 (downloaded) compiler, lld and cargo or their local rust equivalents
298 stage0_metadata: Stage0Metadata,
299 initial_rustc: PathBuf,
300 initial_cargo: PathBuf,
301 initial_lld: PathBuf,
302 initial_libdir: PathBuf,
304 // Runtime state filled in later on
305 // C/C++ compilers and archiver for all targets
306 cc: HashMap<TargetSelection, cc::Tool>,
307 cxx: HashMap<TargetSelection, cc::Tool>,
308 ar: HashMap<TargetSelection, PathBuf>,
309 ranlib: HashMap<TargetSelection, PathBuf>,
311 // allow bidirectional lookups: both name -> path and path -> name
312 crates: HashMap<Interned<String>, Crate>,
313 crate_paths: HashMap<PathBuf, Interned<String>>,
316 delayed_failures: RefCell<Vec<String>>,
317 prerelease_version: Cell<Option<u32>>,
319 RefCell<HashMap<TargetSelection, HashMap<String, (&'static str, PathBuf, Vec<String>)>>>,
321 #[cfg(feature = "build-metrics")]
322 metrics: metrics::BuildMetrics,
325 #[derive(Deserialize)]
326 struct Stage0Metadata {
328 checksums_sha256: HashMap<String, String>,
329 rustfmt: Option<RustfmtMetadata>,
331 #[derive(Deserialize)]
332 struct RustfmtMetadata {
339 name: Interned<String>,
340 deps: HashSet<Interned<String>>,
345 fn local_path(&self, build: &Build) -> PathBuf {
346 self.path.strip_prefix(&build.config.src).unwrap().into()
350 /// When building Rust various objects are handled differently.
351 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
352 pub enum DependencyType {
353 /// Libraries originating from proc-macros.
355 /// Typical Rust libraries.
357 /// Non Rust libraries and objects shipped to ease usage of certain targets.
361 /// The various "modes" of invoking Cargo.
363 /// These entries currently correspond to the various output directories of the
364 /// build system, with each mod generating output in a different directory.
365 #[derive(Debug, Hash, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
367 /// Build the standard library, placing output in the "stageN-std" directory.
370 /// Build librustc, and compiler libraries, placing output in the "stageN-rustc" directory.
373 /// Build a codegen backend for rustc, placing the output in the "stageN-codegen" directory.
376 /// Build a tool, placing output in the "stage0-bootstrap-tools"
377 /// directory. This is for miscellaneous sets of tools that are built
378 /// using the bootstrap stage0 compiler in its entirety (target libraries
379 /// and all). Typically these tools compile with stable Rust.
382 /// Build a tool which uses the locally built std, placing output in the
383 /// "stageN-tools" directory. Its usage is quite rare, mainly used by
384 /// compiletest which needs libtest.
387 /// Build a tool which uses the locally built rustc and the target std,
388 /// placing the output in the "stageN-tools" directory. This is used for
389 /// anything that needs a fully functional rustc, such as rustdoc, clippy,
390 /// cargo, rls, rustfmt, miri, etc.
395 pub fn is_tool(&self) -> bool {
396 matches!(self, Mode::ToolBootstrap | Mode::ToolRustc | Mode::ToolStd)
399 pub fn must_support_dlopen(&self) -> bool {
400 matches!(self, Mode::Std | Mode::Codegen)
410 /// Creates a new set of build configuration from the `flags` on the command
411 /// line and the filesystem `config`.
413 /// By default all build output will be placed in the current directory.
414 pub fn new(config: Config) -> Build {
415 let src = config.src.clone();
416 let out = config.out.clone();
418 let is_sudo = match env::var_os("SUDO_USER") {
419 Some(sudo_user) => match env::var_os("USER") {
420 Some(user) => user != sudo_user,
426 let ignore_git = config.ignore_git;
427 let rust_info = channel::GitInfo::new(ignore_git, &src);
428 let cargo_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/cargo"));
429 let rls_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/rls"));
430 let rust_analyzer_info =
431 channel::GitInfo::new(ignore_git, &src.join("src/tools/rust-analyzer"));
432 let clippy_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/clippy"));
433 let miri_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/miri"));
434 let rustfmt_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/rustfmt"));
436 // we always try to use git for LLVM builds
437 let in_tree_llvm_info = channel::GitInfo::new(false, &src.join("src/llvm-project"));
439 let initial_target_libdir_str = if config.dry_run {
440 "/dummy/lib/path/to/lib/".to_string()
443 Command::new(&config.initial_rustc)
445 .arg(config.build.rustc_target_arg())
447 .arg("target-libdir"),
450 let initial_target_dir = Path::new(&initial_target_libdir_str).parent().unwrap();
451 let initial_lld = initial_target_dir.join("bin").join("rust-lld");
453 let initial_sysroot = if config.dry_run {
456 output(Command::new(&config.initial_rustc).arg("--print").arg("sysroot"))
458 let initial_libdir = initial_target_dir
463 .strip_prefix(initial_sysroot.trim())
467 let version = std::fs::read_to_string(src.join("src").join("version"))
468 .expect("failed to read src/version");
469 let version = version.trim();
471 let bootstrap_out = if std::env::var("BOOTSTRAP_PYTHON").is_ok() {
472 out.join("bootstrap").join("debug")
474 let workspace_target_dir = std::env::var("CARGO_TARGET_DIR")
476 .unwrap_or_else(|_| src.join("target"));
477 let bootstrap_out = workspace_target_dir.join("debug");
478 if !bootstrap_out.join("rustc").exists() && !cfg!(test) {
479 // this restriction can be lifted whenever https://github.com/rust-lang/rfcs/pull/3028 is implemented
480 panic!("run `cargo build --bins` before `cargo run`")
485 let stage0_json = t!(std::fs::read_to_string(&src.join("src").join("stage0.json")));
486 let stage0_metadata = t!(serde_json::from_str::<Stage0Metadata>(&stage0_json));
488 let mut build = Build {
490 initial_rustc: config.initial_rustc.clone(),
491 initial_cargo: config.initial_cargo.clone(),
494 local_rebuild: config.local_rebuild,
495 fail_fast: config.cmd.fail_fast(),
496 doc_tests: config.cmd.doc_tests(),
497 verbosity: config.verbose,
500 hosts: config.hosts.clone(),
501 targets: config.targets.clone(),
504 version: version.to_string(),
520 ranlib: HashMap::new(),
521 crates: HashMap::new(),
522 crate_paths: HashMap::new(),
524 ci_env: CiEnv::current(),
525 delayed_failures: RefCell::new(Vec::new()),
526 prerelease_version: Cell::new(None),
527 tool_artifacts: Default::default(),
529 #[cfg(feature = "build-metrics")]
530 metrics: metrics::BuildMetrics::init(),
533 build.verbose("finding compilers");
534 cc_detect::find(&mut build);
535 // When running `setup`, the profile is about to change, so any requirements we have now may
536 // be different on the next invocation. Don't check for them until the next time x.py is
537 // run. This is ok because `setup` never runs any build commands, so it won't fail if commands are missing.
538 if !matches!(build.config.cmd, Subcommand::Setup { .. }) {
539 build.verbose("running sanity check");
540 sanity::check(&mut build);
543 // If local-rust is the same major.minor as the current version, then force a
545 let local_version_verbose =
546 output(Command::new(&build.initial_rustc).arg("--version").arg("--verbose"));
547 let local_release = local_version_verbose
549 .filter_map(|x| x.strip_prefix("release:"))
553 if local_release.split('.').take(2).eq(version.split('.').take(2)) {
554 build.verbose(&format!("auto-detected local-rebuild {}", local_release));
555 build.local_rebuild = true;
558 build.verbose("learning about cargo");
559 metadata::build(&mut build);
564 // modified from `check_submodule` and `update_submodule` in bootstrap.py
565 /// Given a path to the directory of a submodule, update it.
567 /// `relative_path` should be relative to the root of the git repository, not an absolute path.
568 pub(crate) fn update_submodule(&self, relative_path: &Path) {
569 fn dir_is_empty(dir: &Path) -> bool {
570 t!(std::fs::read_dir(dir)).next().is_none()
573 if !self.config.submodules(&self.rust_info) {
577 let absolute_path = self.config.src.join(relative_path);
579 // NOTE: The check for the empty directory is here because when running x.py the first time,
580 // the submodule won't be checked out. Check it out now so we can build it.
581 if !channel::GitInfo::new(false, &absolute_path).is_git() && !dir_is_empty(&absolute_path) {
586 let checked_out_hash =
587 output(Command::new("git").args(&["rev-parse", "HEAD"]).current_dir(&absolute_path));
589 let recorded = output(
591 .args(&["ls-tree", "HEAD"])
593 .current_dir(&self.config.src),
595 let actual_hash = recorded
598 .unwrap_or_else(|| panic!("unexpected output `{}`", recorded));
601 if actual_hash == checked_out_hash.trim_end() {
602 // already checked out
606 println!("Updating submodule {}", relative_path.display());
609 .args(&["submodule", "-q", "sync"])
611 .current_dir(&self.config.src),
614 // Try passing `--progress` to start, then run git again without if that fails.
615 let update = |progress: bool| {
616 let mut git = Command::new("git");
617 git.args(&["submodule", "update", "--init", "--recursive", "--depth=1"]);
619 git.arg("--progress");
621 git.arg(relative_path).current_dir(&self.config.src);
624 // NOTE: doesn't use `try_run` because this shouldn't print an error if it fails.
625 if !update(true).status().map_or(false, |status| status.success()) {
626 self.run(&mut update(false));
629 self.run(Command::new("git").args(&["reset", "-q", "--hard"]).current_dir(&absolute_path));
630 self.run(Command::new("git").args(&["clean", "-qdfx"]).current_dir(absolute_path));
633 /// If any submodule has been initialized already, sync it unconditionally.
634 /// This avoids contributors checking in a submodule change by accident.
635 pub fn maybe_update_submodules(&self) {
636 // WARNING: keep this in sync with the submodules hard-coded in bootstrap.py
637 let mut bootstrap_submodules: Vec<&str> = vec![
638 "src/tools/rust-installer",
645 // As in bootstrap.py, we include `rust-analyzer` if `build.vendor` was set in
647 if self.config.vendor {
648 bootstrap_submodules.push("src/tools/rust-analyzer");
650 // Avoid running git when there isn't a git checkout.
651 if !self.config.submodules(&self.rust_info) {
656 .args(&["config", "--file"])
657 .arg(&self.config.src.join(".gitmodules"))
658 .args(&["--get-regexp", "path"]),
660 for line in output.lines() {
661 // Look for `submodule.$name.path = $path`
662 // Sample output: `submodule.src/rust-installer.path src/tools/rust-installer`
663 let submodule = Path::new(line.splitn(2, ' ').nth(1).unwrap());
664 // avoid updating submodules twice
665 if !bootstrap_submodules.iter().any(|&p| Path::new(p) == submodule)
666 && channel::GitInfo::new(false, submodule).is_git()
668 self.update_submodule(submodule);
673 /// Executes the entire build, as configured by the flags and configuration.
674 pub fn build(&mut self) {
679 self.maybe_update_submodules();
681 if let Subcommand::Format { check, paths } = &self.config.cmd {
682 return format::format(&builder::Builder::new(&self), *check, &paths);
685 if let Subcommand::Clean { all } = self.config.cmd {
686 return clean::clean(self, all);
689 if let Subcommand::Setup { profile } = &self.config.cmd {
690 return setup::setup(&self.config, *profile);
694 let builder = builder::Builder::new(&self);
695 if let Some(path) = builder.paths.get(0) {
696 if path == Path::new("nonexistent/path/to/trigger/cargo/metadata") {
702 if !self.config.dry_run {
704 self.config.dry_run = true;
705 let builder = builder::Builder::new(&self);
706 builder.execute_cli();
708 self.config.dry_run = false;
709 let builder = builder::Builder::new(&self);
710 builder.execute_cli();
712 let builder = builder::Builder::new(&self);
713 builder.execute_cli();
716 // Check for postponed failures from `test --no-fail-fast`.
717 let failures = self.delayed_failures.borrow();
718 if failures.len() > 0 {
719 eprintln!("\n{} command(s) did not execute successfully:\n", failures.len());
720 for failure in failures.iter() {
721 eprintln!(" - {}\n", failure);
726 #[cfg(feature = "build-metrics")]
727 self.metrics.persist(self);
730 /// Clear out `dir` if `input` is newer.
732 /// After this executes, it will also ensure that `dir` exists.
733 fn clear_if_dirty(&self, dir: &Path, input: &Path) -> bool {
734 let stamp = dir.join(".stamp");
735 let mut cleared = false;
736 if mtime(&stamp) < mtime(input) {
737 self.verbose(&format!("Dirty - {}", dir.display()));
738 let _ = fs::remove_dir_all(dir);
740 } else if stamp.exists() {
743 t!(fs::create_dir_all(dir));
744 t!(File::create(stamp));
748 /// Gets the space-separated set of activated features for the standard
750 fn std_features(&self, target: TargetSelection) -> String {
751 let mut features = "panic-unwind".to_string();
753 match self.config.llvm_libunwind(target) {
754 LlvmLibunwind::InTree => features.push_str(" llvm-libunwind"),
755 LlvmLibunwind::System => features.push_str(" system-llvm-libunwind"),
756 LlvmLibunwind::No => {}
758 if self.config.backtrace {
759 features.push_str(" backtrace");
761 if self.config.profiler_enabled(target) {
762 features.push_str(" profiler");
767 /// Gets the space-separated set of activated features for the compiler.
768 fn rustc_features(&self, kind: Kind) -> String {
769 let mut features = vec![];
770 if self.config.jemalloc {
771 features.push("jemalloc");
773 if self.config.llvm_enabled() || kind == Kind::Check {
774 features.push("llvm");
776 // keep in sync with `bootstrap/compile.rs:rustc_cargo_env`
777 if self.config.rustc_parallel {
778 features.push("rustc_use_parallel_compiler");
781 // If debug logging is on, then we want the default for tracing:
782 // https://github.com/tokio-rs/tracing/blob/3dd5c03d907afdf2c39444a29931833335171554/tracing/src/level_filters.rs#L26
783 // which is everything (including debug/trace/etc.)
784 // if its unset, if debug_assertions is on, then debug_logging will also be on
785 // as well as tracing *ignoring* this feature when debug_assertions is on
786 if !self.config.rust_debug_logging {
787 features.push("max_level_info");
793 /// Component directory that Cargo will produce output into (e.g.
795 fn cargo_dir(&self) -> &'static str {
796 if self.config.rust_optimize { "release" } else { "debug" }
799 fn tools_dir(&self, compiler: Compiler) -> PathBuf {
802 .join(&*compiler.host.triple)
803 .join(format!("stage{}-tools-bin", compiler.stage));
804 t!(fs::create_dir_all(&out));
808 /// Returns the root directory for all output generated in a particular
809 /// stage when running with a particular host compiler.
811 /// The mode indicates what the root directory is for.
812 fn stage_out(&self, compiler: Compiler, mode: Mode) -> PathBuf {
813 let suffix = match mode {
815 Mode::Rustc => "-rustc",
816 Mode::Codegen => "-codegen",
817 Mode::ToolBootstrap => "-bootstrap-tools",
818 Mode::ToolStd | Mode::ToolRustc => "-tools",
820 self.out.join(&*compiler.host.triple).join(format!("stage{}{}", compiler.stage, suffix))
823 /// Returns the root output directory for all Cargo output in a given stage,
824 /// running a particular compiler, whether or not we're building the
825 /// standard library, and targeting the specified architecture.
826 fn cargo_out(&self, compiler: Compiler, mode: Mode, target: TargetSelection) -> PathBuf {
827 self.stage_out(compiler, mode).join(&*target.triple).join(self.cargo_dir())
830 /// Root output directory for LLVM compiled for `target`
832 /// Note that if LLVM is configured externally then the directory returned
833 /// will likely be empty.
834 fn llvm_out(&self, target: TargetSelection) -> PathBuf {
835 self.out.join(&*target.triple).join("llvm")
838 fn lld_out(&self, target: TargetSelection) -> PathBuf {
839 self.out.join(&*target.triple).join("lld")
842 /// Output directory for all documentation for a target
843 fn doc_out(&self, target: TargetSelection) -> PathBuf {
844 self.out.join(&*target.triple).join("doc")
847 fn test_out(&self, target: TargetSelection) -> PathBuf {
848 self.out.join(&*target.triple).join("test")
851 /// Output directory for all documentation for a target
852 fn compiler_doc_out(&self, target: TargetSelection) -> PathBuf {
853 self.out.join(&*target.triple).join("compiler-doc")
856 /// Output directory for some generated md crate documentation for a target (temporary)
857 fn md_doc_out(&self, target: TargetSelection) -> Interned<PathBuf> {
858 INTERNER.intern_path(self.out.join(&*target.triple).join("md-doc"))
861 /// Returns `true` if no custom `llvm-config` is set for the specified target.
863 /// If no custom `llvm-config` was specified then Rust's llvm will be used.
864 fn is_rust_llvm(&self, target: TargetSelection) -> bool {
865 if self.config.llvm_from_ci && target == self.config.build {
869 match self.config.target_config.get(&target) {
870 Some(ref c) => c.llvm_config.is_none(),
875 /// Returns the path to `FileCheck` binary for the specified target
876 fn llvm_filecheck(&self, target: TargetSelection) -> PathBuf {
877 let target_config = self.config.target_config.get(&target);
878 if let Some(s) = target_config.and_then(|c| c.llvm_filecheck.as_ref()) {
880 } else if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
881 let llvm_bindir = output(Command::new(s).arg("--bindir"));
882 let filecheck = Path::new(llvm_bindir.trim()).join(exe("FileCheck", target));
883 if filecheck.exists() {
886 // On Fedora the system LLVM installs FileCheck in the
887 // llvm subdirectory of the libdir.
888 let llvm_libdir = output(Command::new(s).arg("--libdir"));
890 Path::new(llvm_libdir.trim()).join("llvm").join(exe("FileCheck", target));
891 if lib_filecheck.exists() {
894 // Return the most normal file name, even though
895 // it doesn't exist, so that any error message
901 let base = self.llvm_out(target).join("build");
902 let base = if !self.ninja() && target.contains("msvc") {
903 if self.config.llvm_optimize {
904 if self.config.llvm_release_debuginfo {
905 base.join("RelWithDebInfo")
915 base.join("bin").join(exe("FileCheck", target))
919 /// Directory for libraries built from C/C++ code and shared between stages.
920 fn native_dir(&self, target: TargetSelection) -> PathBuf {
921 self.out.join(&*target.triple).join("native")
924 /// Root output directory for rust_test_helpers library compiled for
926 fn test_helpers_out(&self, target: TargetSelection) -> PathBuf {
927 self.native_dir(target).join("rust-test-helpers")
930 /// Adds the `RUST_TEST_THREADS` env var if necessary
931 fn add_rust_test_threads(&self, cmd: &mut Command) {
932 if env::var_os("RUST_TEST_THREADS").is_none() {
933 cmd.env("RUST_TEST_THREADS", self.jobs().to_string());
937 /// Returns the libdir of the snapshot compiler.
938 fn rustc_snapshot_libdir(&self) -> PathBuf {
939 self.rustc_snapshot_sysroot().join(libdir(self.config.build))
942 /// Returns the sysroot of the snapshot compiler.
943 fn rustc_snapshot_sysroot(&self) -> &Path {
944 static SYSROOT_CACHE: OnceCell<PathBuf> = once_cell::sync::OnceCell::new();
945 SYSROOT_CACHE.get_or_init(|| {
946 let mut rustc = Command::new(&self.initial_rustc);
947 rustc.args(&["--print", "sysroot"]);
948 output(&mut rustc).trim().into()
952 /// Runs a command, printing out nice contextual information if it fails.
953 fn run(&self, cmd: &mut Command) {
954 if self.config.dry_run {
957 self.verbose(&format!("running: {:?}", cmd));
958 run(cmd, self.is_verbose())
961 /// Runs a command, printing out nice contextual information if it fails.
962 fn run_quiet(&self, cmd: &mut Command) {
963 if self.config.dry_run {
966 self.verbose(&format!("running: {:?}", cmd));
970 /// Runs a command, printing out nice contextual information if it fails.
971 /// Exits if the command failed to execute at all, otherwise returns its
972 /// `status.success()`.
973 fn try_run(&self, cmd: &mut Command) -> bool {
974 if self.config.dry_run {
977 self.verbose(&format!("running: {:?}", cmd));
978 try_run(cmd, self.is_verbose())
981 /// Runs a command, printing out nice contextual information if it fails.
982 /// Exits if the command failed to execute at all, otherwise returns its
983 /// `status.success()`.
984 fn try_run_quiet(&self, cmd: &mut Command) -> bool {
985 if self.config.dry_run {
988 self.verbose(&format!("running: {:?}", cmd));
989 try_run_suppressed(cmd)
992 /// Runs a command, printing out nice contextual information if it fails.
993 /// Returns false if do not execute at all, otherwise returns its
994 /// `status.success()`.
995 fn check_run(&self, cmd: &mut Command) -> bool {
996 if self.config.dry_run {
999 self.verbose(&format!("running: {:?}", cmd));
1000 check_run(cmd, self.is_verbose())
1003 pub fn is_verbose(&self) -> bool {
1007 /// Prints a message if this build is configured in verbose mode.
1008 fn verbose(&self, msg: &str) {
1009 if self.is_verbose() {
1010 println!("{}", msg);
1014 pub fn is_verbose_than(&self, level: usize) -> bool {
1015 self.verbosity > level
1018 /// Prints a message if this build is configured in more verbose mode than `level`.
1019 fn verbose_than(&self, level: usize, msg: &str) {
1020 if self.is_verbose_than(level) {
1021 println!("{}", msg);
1025 fn info(&self, msg: &str) {
1026 if self.config.dry_run {
1029 println!("{}", msg);
1032 /// Returns the number of parallel jobs that have been configured for this
1034 fn jobs(&self) -> u32 {
1035 self.config.jobs.unwrap_or_else(|| num_cpus::get() as u32)
1038 fn debuginfo_map_to(&self, which: GitRepo) -> Option<String> {
1039 if !self.config.rust_remap_debuginfo {
1045 let sha = self.rust_sha().unwrap_or(&self.version);
1046 Some(format!("/rustc/{}", sha))
1048 GitRepo::Llvm => Some(String::from("/rustc/llvm")),
1052 /// Returns the path to the C compiler for the target specified.
1053 fn cc(&self, target: TargetSelection) -> &Path {
1054 self.cc[&target].path()
1057 /// Returns a list of flags to pass to the C compiler for the target
1059 fn cflags(&self, target: TargetSelection, which: GitRepo, c: CLang) -> Vec<String> {
1060 let base = match c {
1061 CLang::C => &self.cc[&target],
1062 CLang::Cxx => &self.cxx[&target],
1065 // Filter out -O and /O (the optimization flags) that we picked up from
1066 // cc-rs because the build scripts will determine that for themselves.
1070 .map(|s| s.to_string_lossy().into_owned())
1071 .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
1072 .collect::<Vec<String>>();
1074 // If we're compiling on macOS then we add a few unconditional flags
1075 // indicating that we want libc++ (more filled out than libstdc++) and
1076 // we want to compile for 10.7. This way we can ensure that
1077 // LLVM/etc are all properly compiled.
1078 if target.contains("apple-darwin") {
1079 base.push("-stdlib=libc++".into());
1082 // Work around an apparently bad MinGW / GCC optimization,
1083 // See: https://lists.llvm.org/pipermail/cfe-dev/2016-December/051980.html
1084 // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78936
1085 if &*target.triple == "i686-pc-windows-gnu" {
1086 base.push("-fno-omit-frame-pointer".into());
1089 if let Some(map_to) = self.debuginfo_map_to(which) {
1090 let map = format!("{}={}", self.src.display(), map_to);
1091 let cc = self.cc(target);
1092 if cc.ends_with("clang") || cc.ends_with("gcc") {
1093 base.push(format!("-fdebug-prefix-map={}", map));
1094 } else if cc.ends_with("clang-cl.exe") {
1095 base.push("-Xclang".into());
1096 base.push(format!("-fdebug-prefix-map={}", map));
1102 /// Returns the path to the `ar` archive utility for the target specified.
1103 fn ar(&self, target: TargetSelection) -> Option<&Path> {
1104 self.ar.get(&target).map(|p| &**p)
1107 /// Returns the path to the `ranlib` utility for the target specified.
1108 fn ranlib(&self, target: TargetSelection) -> Option<&Path> {
1109 self.ranlib.get(&target).map(|p| &**p)
1112 /// Returns the path to the C++ compiler for the target specified.
1113 fn cxx(&self, target: TargetSelection) -> Result<&Path, String> {
1114 match self.cxx.get(&target) {
1115 Some(p) => Ok(p.path()),
1117 Err(format!("target `{}` is not configured as a host, only as a target", target))
1122 /// Returns the path to the linker for the given target if it needs to be overridden.
1123 fn linker(&self, target: TargetSelection) -> Option<&Path> {
1124 if let Some(linker) = self.config.target_config.get(&target).and_then(|c| c.linker.as_ref())
1127 } else if target.contains("vxworks") {
1128 // need to use CXX compiler as linker to resolve the exception functions
1129 // that are only existed in CXX libraries
1130 Some(self.cxx[&target].path())
1131 } else if target != self.config.build
1132 && util::use_host_linker(target)
1133 && !target.contains("msvc")
1135 Some(self.cc(target))
1136 } else if self.config.use_lld && !self.is_fuse_ld_lld(target) && self.build == target {
1137 Some(&self.initial_lld)
1143 // LLD is used through `-fuse-ld=lld` rather than directly.
1144 // Only MSVC targets use LLD directly at the moment.
1145 fn is_fuse_ld_lld(&self, target: TargetSelection) -> bool {
1146 self.config.use_lld && !target.contains("msvc")
1149 fn lld_flags(&self, target: TargetSelection) -> impl Iterator<Item = String> {
1150 let mut options = [None, None];
1152 if self.config.use_lld {
1153 if self.is_fuse_ld_lld(target) {
1154 options[0] = Some("-Clink-arg=-fuse-ld=lld".to_string());
1157 let threads = if target.contains("windows") { "/threads:1" } else { "--threads=1" };
1158 options[1] = Some(format!("-Clink-arg=-Wl,{}", threads));
1161 IntoIterator::into_iter(options).flatten()
1164 /// Returns if this target should statically link the C runtime, if specified
1165 fn crt_static(&self, target: TargetSelection) -> Option<bool> {
1166 if target.contains("pc-windows-msvc") {
1169 self.config.target_config.get(&target).and_then(|t| t.crt_static)
1173 /// Returns the "musl root" for this `target`, if defined
1174 fn musl_root(&self, target: TargetSelection) -> Option<&Path> {
1178 .and_then(|t| t.musl_root.as_ref())
1179 .or_else(|| self.config.musl_root.as_ref())
1183 /// Returns the "musl libdir" for this `target`.
1184 fn musl_libdir(&self, target: TargetSelection) -> Option<PathBuf> {
1185 let t = self.config.target_config.get(&target)?;
1186 if let libdir @ Some(_) = &t.musl_libdir {
1187 return libdir.clone();
1189 self.musl_root(target).map(|root| root.join("lib"))
1192 /// Returns the sysroot for the wasi target, if defined
1193 fn wasi_root(&self, target: TargetSelection) -> Option<&Path> {
1194 self.config.target_config.get(&target).and_then(|t| t.wasi_root.as_ref()).map(|p| &**p)
1197 /// Returns `true` if this is a no-std `target`, if defined
1198 fn no_std(&self, target: TargetSelection) -> Option<bool> {
1199 self.config.target_config.get(&target).map(|t| t.no_std)
1202 /// Returns `true` if the target will be tested using the `remote-test-client`
1203 /// and `remote-test-server` binaries.
1204 fn remote_tested(&self, target: TargetSelection) -> bool {
1205 self.qemu_rootfs(target).is_some()
1206 || target.contains("android")
1207 || env::var_os("TEST_DEVICE_ADDR").is_some()
1210 /// Returns the root of the "rootfs" image that this target will be using,
1211 /// if one was configured.
1213 /// If `Some` is returned then that means that tests for this target are
1214 /// emulated with QEMU and binaries will need to be shipped to the emulator.
1215 fn qemu_rootfs(&self, target: TargetSelection) -> Option<&Path> {
1216 self.config.target_config.get(&target).and_then(|t| t.qemu_rootfs.as_ref()).map(|p| &**p)
1219 /// Path to the python interpreter to use
1220 fn python(&self) -> &Path {
1221 if self.config.build.ends_with("apple-darwin") {
1222 // Force /usr/bin/python3 on macOS for LLDB tests because we're loading the
1223 // LLDB plugin's compiled module which only works with the system python
1224 // (namely not Homebrew-installed python)
1225 Path::new("/usr/bin/python3")
1230 .expect("python is required for running LLDB or rustdoc tests")
1234 /// Temporary directory that extended error information is emitted to.
1235 fn extended_error_dir(&self) -> PathBuf {
1236 self.out.join("tmp/extended-error-metadata")
1239 /// Tests whether the `compiler` compiling for `target` should be forced to
1240 /// use a stage1 compiler instead.
1242 /// Currently, by default, the build system does not perform a "full
1243 /// bootstrap" by default where we compile the compiler three times.
1244 /// Instead, we compile the compiler two times. The final stage (stage2)
1245 /// just copies the libraries from the previous stage, which is what this
1248 /// Here we return `true` if:
1250 /// * The build isn't performing a full bootstrap
1251 /// * The `compiler` is in the final stage, 2
1252 /// * We're not cross-compiling, so the artifacts are already available in
1255 /// When all of these conditions are met the build will lift artifacts from
1256 /// the previous stage forward.
1257 fn force_use_stage1(&self, compiler: Compiler, target: TargetSelection) -> bool {
1258 !self.config.full_bootstrap
1259 && compiler.stage >= 2
1260 && (self.hosts.iter().any(|h| *h == target) || target == self.build)
1263 /// Given `num` in the form "a.b.c" return a "release string" which
1264 /// describes the release version number.
1266 /// For example on nightly this returns "a.b.c-nightly", on beta it returns
1267 /// "a.b.c-beta.1" and on stable it just returns "a.b.c".
1268 fn release(&self, num: &str) -> String {
1269 match &self.config.channel[..] {
1270 "stable" => num.to_string(),
1272 if self.rust_info.is_git() && !self.config.ignore_git {
1273 format!("{}-beta.{}", num, self.beta_prerelease_version())
1275 format!("{}-beta", num)
1278 "nightly" => format!("{}-nightly", num),
1279 _ => format!("{}-dev", num),
1283 fn beta_prerelease_version(&self) -> u32 {
1284 if let Some(s) = self.prerelease_version.get() {
1288 // Figure out how many merge commits happened since we branched off master.
1289 // That's our beta number!
1290 // (Note that we use a `..` range, not the `...` symmetric difference.)
1296 .arg("refs/remotes/origin/master..HEAD")
1297 .current_dir(&self.src),
1299 let n = count.trim().parse().unwrap();
1300 self.prerelease_version.set(Some(n));
1304 /// Returns the value of `release` above for Rust itself.
1305 fn rust_release(&self) -> String {
1306 self.release(&self.version)
1309 /// Returns the "package version" for a component given the `num` release
1312 /// The package version is typically what shows up in the names of tarballs.
1313 /// For channels like beta/nightly it's just the channel name, otherwise
1314 /// it's the `num` provided.
1315 fn package_vers(&self, num: &str) -> String {
1316 match &self.config.channel[..] {
1317 "stable" => num.to_string(),
1318 "beta" => "beta".to_string(),
1319 "nightly" => "nightly".to_string(),
1320 _ => format!("{}-dev", num),
1324 /// Returns the value of `package_vers` above for Rust itself.
1325 fn rust_package_vers(&self) -> String {
1326 self.package_vers(&self.version)
1329 fn llvm_link_tools_dynamically(&self, target: TargetSelection) -> bool {
1330 target.contains("linux-gnu") || target.contains("apple-darwin")
1333 /// Returns the `version` string associated with this compiler for Rust
1336 /// Note that this is a descriptive string which includes the commit date,
1337 /// sha, version, etc.
1338 fn rust_version(&self) -> String {
1339 let mut version = self.rust_info.version(self, &self.version);
1340 if let Some(ref s) = self.config.description {
1341 version.push_str(" (");
1342 version.push_str(s);
1348 /// Returns the full commit hash.
1349 fn rust_sha(&self) -> Option<&str> {
1350 self.rust_info.sha()
1353 /// Returns the `a.b.c` version that the given package is at.
1354 fn release_num(&self, package: &str) -> String {
1355 let toml_file_name = self.src.join(&format!("src/tools/{}/Cargo.toml", package));
1356 let toml = t!(fs::read_to_string(&toml_file_name));
1357 for line in toml.lines() {
1358 if let Some(stripped) =
1359 line.strip_prefix("version = \"").and_then(|s| s.strip_suffix("\""))
1361 return stripped.to_owned();
1365 panic!("failed to find version in {}'s Cargo.toml", package)
1368 /// Returns `true` if unstable features should be enabled for the compiler
1370 fn unstable_features(&self) -> bool {
1371 match &self.config.channel[..] {
1372 "stable" | "beta" => false,
1373 "nightly" | _ => true,
1377 /// Returns a Vec of all the dependencies of the given root crate,
1378 /// including transitive dependencies and the root itself. Only includes
1379 /// "local" crates (those in the local source tree, not from a registry).
1380 fn in_tree_crates(&self, root: &str, target: Option<TargetSelection>) -> Vec<&Crate> {
1381 let mut ret = Vec::new();
1382 let mut list = vec![INTERNER.intern_str(root)];
1383 let mut visited = HashSet::new();
1384 while let Some(krate) = list.pop() {
1385 let krate = &self.crates[&krate];
1387 for dep in &krate.deps {
1388 if !self.crates.contains_key(dep) {
1389 // Ignore non-workspace members.
1392 // Don't include optional deps if their features are not
1393 // enabled. Ideally this would be computed from `cargo
1394 // metadata --features …`, but that is somewhat slow. In
1395 // the future, we may want to consider just filtering all
1396 // build and dev dependencies in metadata::build.
1397 if visited.insert(dep)
1398 && (dep != "profiler_builtins"
1400 .map(|t| self.config.profiler_enabled(t))
1401 .unwrap_or_else(|| self.config.any_profiler_enabled()))
1402 && (dep != "rustc_codegen_llvm" || self.config.llvm_enabled())
1411 fn read_stamp_file(&self, stamp: &Path) -> Vec<(PathBuf, DependencyType)> {
1412 if self.config.dry_run {
1416 let mut paths = Vec::new();
1417 let contents = t!(fs::read(stamp), &stamp);
1418 // This is the method we use for extracting paths from the stamp file passed to us. See
1419 // run_cargo for more information (in compile.rs).
1420 for part in contents.split(|b| *b == 0) {
1421 if part.is_empty() {
1424 let dependency_type = match part[0] as char {
1425 'h' => DependencyType::Host,
1426 's' => DependencyType::TargetSelfContained,
1427 't' => DependencyType::Target,
1428 _ => unreachable!(),
1430 let path = PathBuf::from(t!(str::from_utf8(&part[1..])));
1431 paths.push((path, dependency_type));
1436 /// Create a temporary directory in `out` and return its path.
1438 /// NOTE: this temporary directory is shared between all steps;
1439 /// if you need an empty directory, create a new subdirectory inside it.
1440 fn tempdir(&self) -> PathBuf {
1441 let tmp = self.out.join("tmp");
1442 t!(fs::create_dir_all(&tmp));
1446 /// Copies a file from `src` to `dst`
1447 pub fn copy(&self, src: &Path, dst: &Path) {
1448 if self.config.dry_run {
1451 self.verbose_than(1, &format!("Copy {:?} to {:?}", src, dst));
1455 let _ = fs::remove_file(&dst);
1456 let metadata = t!(src.symlink_metadata());
1457 if metadata.file_type().is_symlink() {
1458 let link = t!(fs::read_link(src));
1459 t!(symlink_file(link, dst));
1460 } else if let Ok(()) = fs::hard_link(src, dst) {
1461 // Attempt to "easy copy" by creating a hard link
1462 // (symlinks don't work on windows), but if that fails
1463 // just fall back to a slow `copy` operation.
1465 if let Err(e) = fs::copy(src, dst) {
1466 panic!("failed to copy `{}` to `{}`: {}", src.display(), dst.display(), e)
1468 t!(fs::set_permissions(dst, metadata.permissions()));
1469 let atime = FileTime::from_last_access_time(&metadata);
1470 let mtime = FileTime::from_last_modification_time(&metadata);
1471 t!(filetime::set_file_times(dst, atime, mtime));
1475 /// Copies the `src` directory recursively to `dst`. Both are assumed to exist
1476 /// when this function is called.
1477 pub fn cp_r(&self, src: &Path, dst: &Path) {
1478 if self.config.dry_run {
1481 for f in self.read_dir(src) {
1482 let path = f.path();
1483 let name = path.file_name().unwrap();
1484 let dst = dst.join(name);
1485 if t!(f.file_type()).is_dir() {
1486 t!(fs::create_dir_all(&dst));
1487 self.cp_r(&path, &dst);
1489 let _ = fs::remove_file(&dst);
1490 self.copy(&path, &dst);
1495 /// Copies the `src` directory recursively to `dst`. Both are assumed to exist
1496 /// when this function is called. Unwanted files or directories can be skipped
1497 /// by returning `false` from the filter function.
1498 pub fn cp_filtered(&self, src: &Path, dst: &Path, filter: &dyn Fn(&Path) -> bool) {
1499 // Immediately recurse with an empty relative path
1500 self.recurse_(src, dst, Path::new(""), filter)
1503 // Inner function does the actual work
1504 fn recurse_(&self, src: &Path, dst: &Path, relative: &Path, filter: &dyn Fn(&Path) -> bool) {
1505 for f in self.read_dir(src) {
1506 let path = f.path();
1507 let name = path.file_name().unwrap();
1508 let dst = dst.join(name);
1509 let relative = relative.join(name);
1510 // Only copy file or directory if the filter function returns true
1511 if filter(&relative) {
1512 if t!(f.file_type()).is_dir() {
1513 let _ = fs::remove_dir_all(&dst);
1514 self.create_dir(&dst);
1515 self.recurse_(&path, &dst, &relative, filter);
1517 let _ = fs::remove_file(&dst);
1518 self.copy(&path, &dst);
1524 fn copy_to_folder(&self, src: &Path, dest_folder: &Path) {
1525 let file_name = src.file_name().unwrap();
1526 let dest = dest_folder.join(file_name);
1527 self.copy(src, &dest);
1530 fn install(&self, src: &Path, dstdir: &Path, perms: u32) {
1531 if self.config.dry_run {
1534 let dst = dstdir.join(src.file_name().unwrap());
1535 self.verbose_than(1, &format!("Install {:?} to {:?}", src, dst));
1536 t!(fs::create_dir_all(dstdir));
1537 drop(fs::remove_file(&dst));
1540 panic!("Error: File \"{}\" not found!", src.display());
1542 let metadata = t!(src.symlink_metadata());
1543 if let Err(e) = fs::copy(&src, &dst) {
1544 panic!("failed to copy `{}` to `{}`: {}", src.display(), dst.display(), e)
1546 t!(fs::set_permissions(&dst, metadata.permissions()));
1547 let atime = FileTime::from_last_access_time(&metadata);
1548 let mtime = FileTime::from_last_modification_time(&metadata);
1549 t!(filetime::set_file_times(&dst, atime, mtime));
1554 fn create(&self, path: &Path, s: &str) {
1555 if self.config.dry_run {
1558 t!(fs::write(path, s));
1561 fn read(&self, path: &Path) -> String {
1562 if self.config.dry_run {
1563 return String::new();
1565 t!(fs::read_to_string(path))
1568 fn create_dir(&self, dir: &Path) {
1569 if self.config.dry_run {
1572 t!(fs::create_dir_all(dir))
1575 fn remove_dir(&self, dir: &Path) {
1576 if self.config.dry_run {
1579 t!(fs::remove_dir_all(dir))
1582 fn read_dir(&self, dir: &Path) -> impl Iterator<Item = fs::DirEntry> {
1583 let iter = match fs::read_dir(dir) {
1585 Err(_) if self.config.dry_run => return vec![].into_iter(),
1586 Err(err) => panic!("could not read dir {:?}: {:?}", dir, err),
1588 iter.map(|e| t!(e)).collect::<Vec<_>>().into_iter()
1591 fn remove(&self, f: &Path) {
1592 if self.config.dry_run {
1595 fs::remove_file(f).unwrap_or_else(|_| panic!("failed to remove {:?}", f));
1598 /// Returns if config.ninja is enabled, and checks for ninja existence,
1599 /// exiting with a nicer error message if not.
1600 fn ninja(&self) -> bool {
1601 let mut cmd_finder = crate::sanity::Finder::new();
1603 if self.config.ninja_in_file {
1604 // Some Linux distros rename `ninja` to `ninja-build`.
1605 // CMake can work with either binary name.
1606 if cmd_finder.maybe_have("ninja-build").is_none()
1607 && cmd_finder.maybe_have("ninja").is_none()
1611 Couldn't find required command: ninja (or ninja-build)
1613 You should install ninja as described at
1614 <https://github.com/ninja-build/ninja/wiki/Pre-built-Ninja-packages>,
1615 or set `ninja = false` in the `[llvm]` section of `config.toml`.
1616 Alternatively, set `download-ci-llvm = true` in that `[llvm]` section
1617 to download LLVM rather than building it.
1620 std::process::exit(1);
1624 // If ninja isn't enabled but we're building for MSVC then we try
1625 // doubly hard to enable it. It was realized in #43767 that the msbuild
1626 // CMake generator for MSVC doesn't respect configuration options like
1627 // disabling LLVM assertions, which can often be quite important!
1629 // In these cases we automatically enable Ninja if we find it in the
1631 if !self.config.ninja_in_file && self.config.build.contains("msvc") {
1632 if cmd_finder.maybe_have("ninja").is_some() {
1637 self.config.ninja_in_file
1642 fn chmod(path: &Path, perms: u32) {
1643 use std::os::unix::fs::*;
1644 t!(fs::set_permissions(path, fs::Permissions::from_mode(perms)));
1647 fn chmod(_path: &Path, _perms: u32) {}
1650 pub fn with_stage(mut self, stage: u32) -> Compiler {
1655 /// Returns `true` if this is a snapshot compiler for `build`'s configuration
1656 pub fn is_snapshot(&self, build: &Build) -> bool {
1657 self.stage == 0 && self.host == build.build
1660 /// Returns if this compiler should be treated as a final stage one in the
1661 /// current build session.
1662 /// This takes into account whether we're performing a full bootstrap or
1663 /// not; don't directly compare the stage with `2`!
1664 pub fn is_final_stage(&self, build: &Build) -> bool {
1665 let final_stage = if build.config.full_bootstrap { 2 } else { 1 };
1666 self.stage >= final_stage
1670 fn envify(s: &str) -> String {
1676 .flat_map(|c| c.to_uppercase())