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), "miri", None),
197 (Some(Mode::Std), "stdarch_intel_sde", None),
198 (Some(Mode::Std), "no_fp_fmt_parse", None),
199 (Some(Mode::Std), "no_global_oom_handling", None),
200 (Some(Mode::Std), "freebsd12", None),
201 (Some(Mode::Std), "backtrace_in_libstd", None),
202 // FIXME: Used by rustfmt is their test but is invalid (neither cargo nor bootstrap ever set
203 // this config) should probably by removed or use a allow attribute.
204 (Some(Mode::ToolRustc), "release", None),
205 // FIXME: Used by stdarch in their test, should use a allow attribute instead.
206 (Some(Mode::Std), "dont_compile_me", None),
207 // FIXME: Used by serde_json, but we should not be triggering on external dependencies.
208 (Some(Mode::Rustc), "no_btreemap_remove_entry", None),
209 (Some(Mode::ToolRustc), "no_btreemap_remove_entry", None),
210 // FIXME: Used by crossbeam-utils, but we should not be triggering on external dependencies.
211 (Some(Mode::Rustc), "crossbeam_loom", None),
212 (Some(Mode::ToolRustc), "crossbeam_loom", None),
213 // FIXME: Used by proc-macro2, but we should not be triggering on external dependencies.
214 (Some(Mode::Rustc), "span_locations", None),
215 (Some(Mode::ToolRustc), "span_locations", None),
218 /// A structure representing a Rust compiler.
220 /// Each compiler has a `stage` that it is associated with and a `host` that
221 /// corresponds to the platform the compiler runs on. This structure is used as
222 /// a parameter to many methods below.
223 #[derive(Eq, PartialOrd, Ord, PartialEq, Clone, Copy, Hash, Debug)]
224 pub struct Compiler {
226 host: TargetSelection,
229 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
231 /// Run normal tests and doc tests (default).
233 /// Do not run any doc tests.
235 /// Only run doc tests.
244 /// Global configuration for the build system.
246 /// This structure transitively contains all configuration for the build system.
247 /// All filesystem-encoded configuration is in `config`, all flags are in
248 /// `flags`, and then parsed or probed information is listed in the keys below.
250 /// This structure is a parameter of almost all methods in the build system,
251 /// although most functions are implemented as free functions rather than
252 /// methods specifically on this structure itself (to make it easier to
255 /// User-specified configuration from `config.toml`.
258 // Version information
261 // Properties derived from the above configuration
264 rust_info: channel::GitInfo,
265 cargo_info: channel::GitInfo,
266 rls_info: channel::GitInfo,
267 rust_analyzer_info: channel::GitInfo,
268 clippy_info: channel::GitInfo,
269 miri_info: channel::GitInfo,
270 rustfmt_info: channel::GitInfo,
271 in_tree_llvm_info: channel::GitInfo,
277 // Targets for which to build
278 build: TargetSelection,
279 hosts: Vec<TargetSelection>,
280 targets: Vec<TargetSelection>,
282 // Stage 0 (downloaded) compiler, lld and cargo or their local rust equivalents
283 initial_rustc: PathBuf,
284 initial_cargo: PathBuf,
285 initial_lld: PathBuf,
286 initial_libdir: PathBuf,
288 // Runtime state filled in later on
289 // C/C++ compilers and archiver for all targets
290 cc: HashMap<TargetSelection, cc::Tool>,
291 cxx: HashMap<TargetSelection, cc::Tool>,
292 ar: HashMap<TargetSelection, PathBuf>,
293 ranlib: HashMap<TargetSelection, PathBuf>,
295 crates: HashMap<Interned<String>, Crate>,
298 delayed_failures: RefCell<Vec<String>>,
299 prerelease_version: Cell<Option<u32>>,
301 RefCell<HashMap<TargetSelection, HashMap<String, (&'static str, PathBuf, Vec<String>)>>>,
306 name: Interned<String>,
307 deps: HashSet<Interned<String>>,
312 fn local_path(&self, build: &Build) -> PathBuf {
313 self.path.strip_prefix(&build.config.src).unwrap().into()
317 /// When building Rust various objects are handled differently.
318 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
319 pub enum DependencyType {
320 /// Libraries originating from proc-macros.
322 /// Typical Rust libraries.
324 /// Non Rust libraries and objects shipped to ease usage of certain targets.
328 /// The various "modes" of invoking Cargo.
330 /// These entries currently correspond to the various output directories of the
331 /// build system, with each mod generating output in a different directory.
332 #[derive(Debug, Hash, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
334 /// Build the standard library, placing output in the "stageN-std" directory.
337 /// Build librustc, and compiler libraries, placing output in the "stageN-rustc" directory.
340 /// Build a codegen backend for rustc, placing the output in the "stageN-codegen" directory.
343 /// Build a tool, placing output in the "stage0-bootstrap-tools"
344 /// directory. This is for miscellaneous sets of tools that are built
345 /// using the bootstrap stage0 compiler in its entirety (target libraries
346 /// and all). Typically these tools compile with stable Rust.
349 /// Build a tool which uses the locally built std, placing output in the
350 /// "stageN-tools" directory. Its usage is quite rare, mainly used by
351 /// compiletest which needs libtest.
354 /// Build a tool which uses the locally built rustc and the target std,
355 /// placing the output in the "stageN-tools" directory. This is used for
356 /// anything that needs a fully functional rustc, such as rustdoc, clippy,
357 /// cargo, rls, rustfmt, miri, etc.
362 pub fn is_tool(&self) -> bool {
363 matches!(self, Mode::ToolBootstrap | Mode::ToolRustc | Mode::ToolStd)
366 pub fn must_support_dlopen(&self) -> bool {
367 matches!(self, Mode::Std | Mode::Codegen)
377 /// Creates a new set of build configuration from the `flags` on the command
378 /// line and the filesystem `config`.
380 /// By default all build output will be placed in the current directory.
381 pub fn new(config: Config) -> Build {
382 let src = config.src.clone();
383 let out = config.out.clone();
385 let is_sudo = match env::var_os("SUDO_USER") {
386 Some(sudo_user) => match env::var_os("USER") {
387 Some(user) => user != sudo_user,
393 let ignore_git = config.ignore_git;
394 let rust_info = channel::GitInfo::new(ignore_git, &src);
395 let cargo_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/cargo"));
396 let rls_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/rls"));
397 let rust_analyzer_info =
398 channel::GitInfo::new(ignore_git, &src.join("src/tools/rust-analyzer"));
399 let clippy_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/clippy"));
400 let miri_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/miri"));
401 let rustfmt_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/rustfmt"));
403 // we always try to use git for LLVM builds
404 let in_tree_llvm_info = channel::GitInfo::new(false, &src.join("src/llvm-project"));
406 let initial_target_libdir_str = if config.dry_run {
407 "/dummy/lib/path/to/lib/".to_string()
410 Command::new(&config.initial_rustc)
412 .arg(config.build.rustc_target_arg())
414 .arg("target-libdir"),
417 let initial_target_dir = Path::new(&initial_target_libdir_str).parent().unwrap();
418 let initial_lld = initial_target_dir.join("bin").join("rust-lld");
420 let initial_sysroot = if config.dry_run {
423 output(Command::new(&config.initial_rustc).arg("--print").arg("sysroot"))
425 let initial_libdir = initial_target_dir
430 .strip_prefix(initial_sysroot.trim())
434 let version = std::fs::read_to_string(src.join("src").join("version"))
435 .expect("failed to read src/version");
436 let version = version.trim();
438 let mut build = Build {
439 initial_rustc: config.initial_rustc.clone(),
440 initial_cargo: config.initial_cargo.clone(),
443 local_rebuild: config.local_rebuild,
444 fail_fast: config.cmd.fail_fast(),
445 doc_tests: config.cmd.doc_tests(),
446 verbosity: config.verbose,
449 hosts: config.hosts.clone(),
450 targets: config.targets.clone(),
453 version: version.to_string(),
468 ranlib: HashMap::new(),
469 crates: HashMap::new(),
471 ci_env: CiEnv::current(),
472 delayed_failures: RefCell::new(Vec::new()),
473 prerelease_version: Cell::new(None),
474 tool_artifacts: Default::default(),
477 build.verbose("finding compilers");
478 cc_detect::find(&mut build);
479 // When running `setup`, the profile is about to change, so any requirements we have now may
480 // be different on the next invocation. Don't check for them until the next time x.py is
481 // run. This is ok because `setup` never runs any build commands, so it won't fail if commands are missing.
482 if !matches!(build.config.cmd, Subcommand::Setup { .. }) {
483 build.verbose("running sanity check");
484 sanity::check(&mut build);
487 // If local-rust is the same major.minor as the current version, then force a
489 let local_version_verbose =
490 output(Command::new(&build.initial_rustc).arg("--version").arg("--verbose"));
491 let local_release = local_version_verbose
493 .filter_map(|x| x.strip_prefix("release:"))
497 if local_release.split('.').take(2).eq(version.split('.').take(2)) {
498 build.verbose(&format!("auto-detected local-rebuild {}", local_release));
499 build.local_rebuild = true;
502 build.verbose("learning about cargo");
503 metadata::build(&mut build);
508 // modified from `check_submodule` and `update_submodule` in bootstrap.py
509 /// Given a path to the directory of a submodule, update it.
511 /// `relative_path` should be relative to the root of the git repository, not an absolute path.
512 pub(crate) fn update_submodule(&self, relative_path: &Path) {
513 fn dir_is_empty(dir: &Path) -> bool {
514 t!(std::fs::read_dir(dir)).next().is_none()
517 if !self.config.submodules(&self.rust_info) {
521 let absolute_path = self.config.src.join(relative_path);
523 // NOTE: The check for the empty directory is here because when running x.py the first time,
524 // the submodule won't be checked out. Check it out now so we can build it.
525 if !channel::GitInfo::new(false, &absolute_path).is_git() && !dir_is_empty(&absolute_path) {
530 if self.config.fast_submodules {
531 let checked_out_hash = output(
532 Command::new("git").args(&["rev-parse", "HEAD"]).current_dir(&absolute_path),
535 let recorded = output(
537 .args(&["ls-tree", "HEAD"])
539 .current_dir(&self.config.src),
541 let actual_hash = recorded
544 .unwrap_or_else(|| panic!("unexpected output `{}`", recorded));
547 if actual_hash == checked_out_hash.trim_end() {
548 // already checked out
553 println!("Updating submodule {}", relative_path.display());
556 .args(&["submodule", "-q", "sync"])
558 .current_dir(&self.config.src),
561 // Try passing `--progress` to start, then run git again without if that fails.
562 let update = |progress: bool| {
563 let mut git = Command::new("git");
564 git.args(&["submodule", "update", "--init", "--recursive", "--depth=1"]);
566 git.arg("--progress");
568 git.arg(relative_path).current_dir(&self.config.src);
571 // NOTE: doesn't use `try_run` because this shouldn't print an error if it fails.
572 if !update(true).status().map_or(false, |status| status.success()) {
573 self.run(&mut update(false));
576 self.run(Command::new("git").args(&["reset", "-q", "--hard"]).current_dir(&absolute_path));
577 self.run(Command::new("git").args(&["clean", "-qdfx"]).current_dir(absolute_path));
580 /// If any submodule has been initialized already, sync it unconditionally.
581 /// This avoids contributors checking in a submodule change by accident.
582 pub fn maybe_update_submodules(&self) {
583 // WARNING: keep this in sync with the submodules hard-coded in bootstrap.py
584 const BOOTSTRAP_SUBMODULES: &[&str] = &[
585 "src/tools/rust-installer",
592 // Avoid running git when there isn't a git checkout.
593 if !self.config.submodules(&self.rust_info) {
598 .args(&["config", "--file"])
599 .arg(&self.config.src.join(".gitmodules"))
600 .args(&["--get-regexp", "path"]),
602 for line in output.lines() {
603 // Look for `submodule.$name.path = $path`
604 // Sample output: `submodule.src/rust-installer.path src/tools/rust-installer`
605 let submodule = Path::new(line.splitn(2, ' ').nth(1).unwrap());
606 // avoid updating submodules twice
607 if !BOOTSTRAP_SUBMODULES.iter().any(|&p| Path::new(p) == submodule)
608 && channel::GitInfo::new(false, submodule).is_git()
610 self.update_submodule(submodule);
615 /// Executes the entire build, as configured by the flags and configuration.
616 pub fn build(&mut self) {
621 self.maybe_update_submodules();
623 if let Subcommand::Format { check, paths } = &self.config.cmd {
624 return format::format(self, *check, &paths);
627 if let Subcommand::Clean { all } = self.config.cmd {
628 return clean::clean(self, all);
631 if let Subcommand::Setup { profile } = &self.config.cmd {
632 return setup::setup(&self.config.src, *profile);
636 let builder = builder::Builder::new(&self);
637 if let Some(path) = builder.paths.get(0) {
638 if path == Path::new("nonexistent/path/to/trigger/cargo/metadata") {
644 if !self.config.dry_run {
646 self.config.dry_run = true;
647 let builder = builder::Builder::new(&self);
648 builder.execute_cli();
650 self.config.dry_run = false;
651 let builder = builder::Builder::new(&self);
652 builder.execute_cli();
654 let builder = builder::Builder::new(&self);
655 builder.execute_cli();
658 // Check for postponed failures from `test --no-fail-fast`.
659 let failures = self.delayed_failures.borrow();
660 if failures.len() > 0 {
661 println!("\n{} command(s) did not execute successfully:\n", failures.len());
662 for failure in failures.iter() {
663 println!(" - {}\n", failure);
669 /// Clear out `dir` if `input` is newer.
671 /// After this executes, it will also ensure that `dir` exists.
672 fn clear_if_dirty(&self, dir: &Path, input: &Path) -> bool {
673 let stamp = dir.join(".stamp");
674 let mut cleared = false;
675 if mtime(&stamp) < mtime(input) {
676 self.verbose(&format!("Dirty - {}", dir.display()));
677 let _ = fs::remove_dir_all(dir);
679 } else if stamp.exists() {
682 t!(fs::create_dir_all(dir));
683 t!(File::create(stamp));
687 /// Gets the space-separated set of activated features for the standard
689 fn std_features(&self, target: TargetSelection) -> String {
690 let mut features = "panic-unwind".to_string();
692 match self.config.llvm_libunwind {
693 LlvmLibunwind::InTree => features.push_str(" llvm-libunwind"),
694 LlvmLibunwind::System => features.push_str(" system-llvm-libunwind"),
695 LlvmLibunwind::No => {}
697 if self.config.backtrace {
698 features.push_str(" backtrace");
700 if self.config.profiler_enabled(target) {
701 features.push_str(" profiler");
706 /// Gets the space-separated set of activated features for the compiler.
707 fn rustc_features(&self, kind: Kind) -> String {
708 let mut features = String::new();
709 if self.config.jemalloc {
710 features.push_str("jemalloc");
712 if self.config.llvm_enabled() || kind == Kind::Check {
713 features.push_str(" llvm");
716 // If debug logging is on, then we want the default for tracing:
717 // https://github.com/tokio-rs/tracing/blob/3dd5c03d907afdf2c39444a29931833335171554/tracing/src/level_filters.rs#L26
718 // which is everything (including debug/trace/etc.)
719 // if its unset, if debug_assertions is on, then debug_logging will also be on
720 // as well as tracing *ignoring* this feature when debug_assertions is on
721 if !self.config.rust_debug_logging {
722 features.push_str(" max_level_info");
728 /// Component directory that Cargo will produce output into (e.g.
730 fn cargo_dir(&self) -> &'static str {
731 if self.config.rust_optimize { "release" } else { "debug" }
734 fn tools_dir(&self, compiler: Compiler) -> PathBuf {
737 .join(&*compiler.host.triple)
738 .join(format!("stage{}-tools-bin", compiler.stage));
739 t!(fs::create_dir_all(&out));
743 /// Returns the root directory for all output generated in a particular
744 /// stage when running with a particular host compiler.
746 /// The mode indicates what the root directory is for.
747 fn stage_out(&self, compiler: Compiler, mode: Mode) -> PathBuf {
748 let suffix = match mode {
750 Mode::Rustc => "-rustc",
751 Mode::Codegen => "-codegen",
752 Mode::ToolBootstrap => "-bootstrap-tools",
753 Mode::ToolStd | Mode::ToolRustc => "-tools",
755 self.out.join(&*compiler.host.triple).join(format!("stage{}{}", compiler.stage, suffix))
758 /// Returns the root output directory for all Cargo output in a given stage,
759 /// running a particular compiler, whether or not we're building the
760 /// standard library, and targeting the specified architecture.
761 fn cargo_out(&self, compiler: Compiler, mode: Mode, target: TargetSelection) -> PathBuf {
762 self.stage_out(compiler, mode).join(&*target.triple).join(self.cargo_dir())
765 /// Root output directory for LLVM compiled for `target`
767 /// Note that if LLVM is configured externally then the directory returned
768 /// will likely be empty.
769 fn llvm_out(&self, target: TargetSelection) -> PathBuf {
770 self.out.join(&*target.triple).join("llvm")
773 fn lld_out(&self, target: TargetSelection) -> PathBuf {
774 self.out.join(&*target.triple).join("lld")
777 /// Output directory for all documentation for a target
778 fn doc_out(&self, target: TargetSelection) -> PathBuf {
779 self.out.join(&*target.triple).join("doc")
782 fn test_out(&self, target: TargetSelection) -> PathBuf {
783 self.out.join(&*target.triple).join("test")
786 /// Output directory for all documentation for a target
787 fn compiler_doc_out(&self, target: TargetSelection) -> PathBuf {
788 self.out.join(&*target.triple).join("compiler-doc")
791 /// Output directory for some generated md crate documentation for a target (temporary)
792 fn md_doc_out(&self, target: TargetSelection) -> Interned<PathBuf> {
793 INTERNER.intern_path(self.out.join(&*target.triple).join("md-doc"))
796 /// Returns `true` if no custom `llvm-config` is set for the specified target.
798 /// If no custom `llvm-config` was specified then Rust's llvm will be used.
799 fn is_rust_llvm(&self, target: TargetSelection) -> bool {
800 if self.config.llvm_from_ci && target == self.config.build {
804 match self.config.target_config.get(&target) {
805 Some(ref c) => c.llvm_config.is_none(),
810 /// Returns the path to `FileCheck` binary for the specified target
811 fn llvm_filecheck(&self, target: TargetSelection) -> PathBuf {
812 let target_config = self.config.target_config.get(&target);
813 if let Some(s) = target_config.and_then(|c| c.llvm_filecheck.as_ref()) {
815 } else if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
816 let llvm_bindir = output(Command::new(s).arg("--bindir"));
817 let filecheck = Path::new(llvm_bindir.trim()).join(exe("FileCheck", target));
818 if filecheck.exists() {
821 // On Fedora the system LLVM installs FileCheck in the
822 // llvm subdirectory of the libdir.
823 let llvm_libdir = output(Command::new(s).arg("--libdir"));
825 Path::new(llvm_libdir.trim()).join("llvm").join(exe("FileCheck", target));
826 if lib_filecheck.exists() {
829 // Return the most normal file name, even though
830 // it doesn't exist, so that any error message
836 let base = self.llvm_out(self.config.build).join("build");
837 let base = if !self.ninja() && self.config.build.contains("msvc") {
838 if self.config.llvm_optimize {
839 if self.config.llvm_release_debuginfo {
840 base.join("RelWithDebInfo")
850 base.join("bin").join(exe("FileCheck", target))
854 /// Directory for libraries built from C/C++ code and shared between stages.
855 fn native_dir(&self, target: TargetSelection) -> PathBuf {
856 self.out.join(&*target.triple).join("native")
859 /// Root output directory for rust_test_helpers library compiled for
861 fn test_helpers_out(&self, target: TargetSelection) -> PathBuf {
862 self.native_dir(target).join("rust-test-helpers")
865 /// Adds the `RUST_TEST_THREADS` env var if necessary
866 fn add_rust_test_threads(&self, cmd: &mut Command) {
867 if env::var_os("RUST_TEST_THREADS").is_none() {
868 cmd.env("RUST_TEST_THREADS", self.jobs().to_string());
872 /// Returns the libdir of the snapshot compiler.
873 fn rustc_snapshot_libdir(&self) -> PathBuf {
874 self.rustc_snapshot_sysroot().join(libdir(self.config.build))
877 /// Returns the sysroot of the snapshot compiler.
878 fn rustc_snapshot_sysroot(&self) -> &Path {
879 self.initial_rustc.parent().unwrap().parent().unwrap()
882 /// Runs a command, printing out nice contextual information if it fails.
883 fn run(&self, cmd: &mut Command) {
884 if self.config.dry_run {
887 self.verbose(&format!("running: {:?}", cmd));
888 run(cmd, self.is_verbose())
891 /// Runs a command, printing out nice contextual information if it fails.
892 fn run_quiet(&self, cmd: &mut Command) {
893 if self.config.dry_run {
896 self.verbose(&format!("running: {:?}", cmd));
900 /// Runs a command, printing out nice contextual information if it fails.
901 /// Exits if the command failed to execute at all, otherwise returns its
902 /// `status.success()`.
903 fn try_run(&self, cmd: &mut Command) -> bool {
904 if self.config.dry_run {
907 self.verbose(&format!("running: {:?}", cmd));
908 try_run(cmd, self.is_verbose())
911 /// Runs a command, printing out nice contextual information if it fails.
912 /// Exits if the command failed to execute at all, otherwise returns its
913 /// `status.success()`.
914 fn try_run_quiet(&self, cmd: &mut Command) -> bool {
915 if self.config.dry_run {
918 self.verbose(&format!("running: {:?}", cmd));
919 try_run_suppressed(cmd)
922 pub fn is_verbose(&self) -> bool {
926 /// Prints a message if this build is configured in verbose mode.
927 fn verbose(&self, msg: &str) {
928 if self.is_verbose() {
933 pub fn is_verbose_than(&self, level: usize) -> bool {
934 self.verbosity > level
937 /// Prints a message if this build is configured in more verbose mode than `level`.
938 fn verbose_than(&self, level: usize, msg: &str) {
939 if self.is_verbose_than(level) {
944 fn info(&self, msg: &str) {
945 if self.config.dry_run {
951 /// Returns the number of parallel jobs that have been configured for this
953 fn jobs(&self) -> u32 {
954 self.config.jobs.unwrap_or_else(|| {
955 std::thread::available_parallelism().map_or(1, std::num::NonZeroUsize::get) as u32
959 fn debuginfo_map_to(&self, which: GitRepo) -> Option<String> {
960 if !self.config.rust_remap_debuginfo {
966 let sha = self.rust_sha().unwrap_or(&self.version);
967 Some(format!("/rustc/{}", sha))
969 GitRepo::Llvm => Some(String::from("/rustc/llvm")),
973 /// Returns the path to the C compiler for the target specified.
974 fn cc(&self, target: TargetSelection) -> &Path {
975 self.cc[&target].path()
978 /// Returns a list of flags to pass to the C compiler for the target
980 fn cflags(&self, target: TargetSelection, which: GitRepo, c: CLang) -> Vec<String> {
982 CLang::C => &self.cc[&target],
983 CLang::Cxx => &self.cxx[&target],
986 // Filter out -O and /O (the optimization flags) that we picked up from
987 // cc-rs because the build scripts will determine that for themselves.
991 .map(|s| s.to_string_lossy().into_owned())
992 .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
993 .collect::<Vec<String>>();
995 // If we're compiling on macOS then we add a few unconditional flags
996 // indicating that we want libc++ (more filled out than libstdc++) and
997 // we want to compile for 10.7. This way we can ensure that
998 // LLVM/etc are all properly compiled.
999 if target.contains("apple-darwin") {
1000 base.push("-stdlib=libc++".into());
1003 // Work around an apparently bad MinGW / GCC optimization,
1004 // See: https://lists.llvm.org/pipermail/cfe-dev/2016-December/051980.html
1005 // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78936
1006 if &*target.triple == "i686-pc-windows-gnu" {
1007 base.push("-fno-omit-frame-pointer".into());
1010 if let Some(map_to) = self.debuginfo_map_to(which) {
1011 let map = format!("{}={}", self.src.display(), map_to);
1012 let cc = self.cc(target);
1013 if cc.ends_with("clang") || cc.ends_with("gcc") {
1014 base.push(format!("-fdebug-prefix-map={}", map));
1015 } else if cc.ends_with("clang-cl.exe") {
1016 base.push("-Xclang".into());
1017 base.push(format!("-fdebug-prefix-map={}", map));
1023 /// Returns the path to the `ar` archive utility for the target specified.
1024 fn ar(&self, target: TargetSelection) -> Option<&Path> {
1025 self.ar.get(&target).map(|p| &**p)
1028 /// Returns the path to the `ranlib` utility for the target specified.
1029 fn ranlib(&self, target: TargetSelection) -> Option<&Path> {
1030 self.ranlib.get(&target).map(|p| &**p)
1033 /// Returns the path to the C++ compiler for the target specified.
1034 fn cxx(&self, target: TargetSelection) -> Result<&Path, String> {
1035 match self.cxx.get(&target) {
1036 Some(p) => Ok(p.path()),
1038 Err(format!("target `{}` is not configured as a host, only as a target", target))
1043 /// Returns the path to the linker for the given target if it needs to be overridden.
1044 fn linker(&self, target: TargetSelection) -> Option<&Path> {
1045 if let Some(linker) = self.config.target_config.get(&target).and_then(|c| c.linker.as_ref())
1048 } else if target.contains("vxworks") {
1049 // need to use CXX compiler as linker to resolve the exception functions
1050 // that are only existed in CXX libraries
1051 Some(self.cxx[&target].path())
1052 } else if target != self.config.build
1053 && util::use_host_linker(target)
1054 && !target.contains("msvc")
1056 Some(self.cc(target))
1057 } else if self.config.use_lld && !self.is_fuse_ld_lld(target) && self.build == target {
1058 Some(&self.initial_lld)
1064 // LLD is used through `-fuse-ld=lld` rather than directly.
1065 // Only MSVC targets use LLD directly at the moment.
1066 fn is_fuse_ld_lld(&self, target: TargetSelection) -> bool {
1067 self.config.use_lld && !target.contains("msvc")
1070 fn lld_flags(&self, target: TargetSelection) -> impl Iterator<Item = String> {
1071 let mut options = [None, None];
1073 if self.config.use_lld {
1074 if self.is_fuse_ld_lld(target) {
1075 options[0] = Some("-Clink-arg=-fuse-ld=lld".to_string());
1078 let threads = if target.contains("windows") { "/threads:1" } else { "--threads=1" };
1079 options[1] = Some(format!("-Clink-arg=-Wl,{}", threads));
1082 IntoIterator::into_iter(options).flatten()
1085 /// Returns if this target should statically link the C runtime, if specified
1086 fn crt_static(&self, target: TargetSelection) -> Option<bool> {
1087 if target.contains("pc-windows-msvc") {
1090 self.config.target_config.get(&target).and_then(|t| t.crt_static)
1094 /// Returns the "musl root" for this `target`, if defined
1095 fn musl_root(&self, target: TargetSelection) -> Option<&Path> {
1099 .and_then(|t| t.musl_root.as_ref())
1100 .or_else(|| self.config.musl_root.as_ref())
1104 /// Returns the "musl libdir" for this `target`.
1105 fn musl_libdir(&self, target: TargetSelection) -> Option<PathBuf> {
1106 let t = self.config.target_config.get(&target)?;
1107 if let libdir @ Some(_) = &t.musl_libdir {
1108 return libdir.clone();
1110 self.musl_root(target).map(|root| root.join("lib"))
1113 /// Returns the sysroot for the wasi target, if defined
1114 fn wasi_root(&self, target: TargetSelection) -> Option<&Path> {
1115 self.config.target_config.get(&target).and_then(|t| t.wasi_root.as_ref()).map(|p| &**p)
1118 /// Returns `true` if this is a no-std `target`, if defined
1119 fn no_std(&self, target: TargetSelection) -> Option<bool> {
1120 self.config.target_config.get(&target).map(|t| t.no_std)
1123 /// Returns `true` if the target will be tested using the `remote-test-client`
1124 /// and `remote-test-server` binaries.
1125 fn remote_tested(&self, target: TargetSelection) -> bool {
1126 self.qemu_rootfs(target).is_some()
1127 || target.contains("android")
1128 || env::var_os("TEST_DEVICE_ADDR").is_some()
1131 /// Returns the root of the "rootfs" image that this target will be using,
1132 /// if one was configured.
1134 /// If `Some` is returned then that means that tests for this target are
1135 /// emulated with QEMU and binaries will need to be shipped to the emulator.
1136 fn qemu_rootfs(&self, target: TargetSelection) -> Option<&Path> {
1137 self.config.target_config.get(&target).and_then(|t| t.qemu_rootfs.as_ref()).map(|p| &**p)
1140 /// Path to the python interpreter to use
1141 fn python(&self) -> &Path {
1142 self.config.python.as_ref().unwrap()
1145 /// Temporary directory that extended error information is emitted to.
1146 fn extended_error_dir(&self) -> PathBuf {
1147 self.out.join("tmp/extended-error-metadata")
1150 /// Tests whether the `compiler` compiling for `target` should be forced to
1151 /// use a stage1 compiler instead.
1153 /// Currently, by default, the build system does not perform a "full
1154 /// bootstrap" by default where we compile the compiler three times.
1155 /// Instead, we compile the compiler two times. The final stage (stage2)
1156 /// just copies the libraries from the previous stage, which is what this
1159 /// Here we return `true` if:
1161 /// * The build isn't performing a full bootstrap
1162 /// * The `compiler` is in the final stage, 2
1163 /// * We're not cross-compiling, so the artifacts are already available in
1166 /// When all of these conditions are met the build will lift artifacts from
1167 /// the previous stage forward.
1168 fn force_use_stage1(&self, compiler: Compiler, target: TargetSelection) -> bool {
1169 !self.config.full_bootstrap
1170 && compiler.stage >= 2
1171 && (self.hosts.iter().any(|h| *h == target) || target == self.build)
1174 /// Given `num` in the form "a.b.c" return a "release string" which
1175 /// describes the release version number.
1177 /// For example on nightly this returns "a.b.c-nightly", on beta it returns
1178 /// "a.b.c-beta.1" and on stable it just returns "a.b.c".
1179 fn release(&self, num: &str) -> String {
1180 match &self.config.channel[..] {
1181 "stable" => num.to_string(),
1183 if self.rust_info.is_git() && !self.config.ignore_git {
1184 format!("{}-beta.{}", num, self.beta_prerelease_version())
1186 format!("{}-beta", num)
1189 "nightly" => format!("{}-nightly", num),
1190 _ => format!("{}-dev", num),
1194 fn beta_prerelease_version(&self) -> u32 {
1195 if let Some(s) = self.prerelease_version.get() {
1199 // Figure out how many merge commits happened since we branched off master.
1200 // That's our beta number!
1201 // (Note that we use a `..` range, not the `...` symmetric difference.)
1207 .arg("refs/remotes/origin/master..HEAD")
1208 .current_dir(&self.src),
1210 let n = count.trim().parse().unwrap();
1211 self.prerelease_version.set(Some(n));
1215 /// Returns the value of `release` above for Rust itself.
1216 fn rust_release(&self) -> String {
1217 self.release(&self.version)
1220 /// Returns the "package version" for a component given the `num` release
1223 /// The package version is typically what shows up in the names of tarballs.
1224 /// For channels like beta/nightly it's just the channel name, otherwise
1225 /// it's the `num` provided.
1226 fn package_vers(&self, num: &str) -> String {
1227 match &self.config.channel[..] {
1228 "stable" => num.to_string(),
1229 "beta" => "beta".to_string(),
1230 "nightly" => "nightly".to_string(),
1231 _ => format!("{}-dev", num),
1235 /// Returns the value of `package_vers` above for Rust itself.
1236 fn rust_package_vers(&self) -> String {
1237 self.package_vers(&self.version)
1240 fn llvm_link_tools_dynamically(&self, target: TargetSelection) -> bool {
1241 target.contains("linux-gnu") || target.contains("apple-darwin")
1244 /// Returns the `version` string associated with this compiler for Rust
1247 /// Note that this is a descriptive string which includes the commit date,
1248 /// sha, version, etc.
1249 fn rust_version(&self) -> String {
1250 let mut version = self.rust_info.version(self, &self.version);
1251 if let Some(ref s) = self.config.description {
1252 version.push_str(" (");
1253 version.push_str(s);
1259 /// Returns the full commit hash.
1260 fn rust_sha(&self) -> Option<&str> {
1261 self.rust_info.sha()
1264 /// Returns the `a.b.c` version that the given package is at.
1265 fn release_num(&self, package: &str) -> String {
1266 let toml_file_name = self.src.join(&format!("src/tools/{}/Cargo.toml", package));
1267 let toml = t!(fs::read_to_string(&toml_file_name));
1268 for line in toml.lines() {
1269 if let Some(stripped) =
1270 line.strip_prefix("version = \"").and_then(|s| s.strip_suffix("\""))
1272 return stripped.to_owned();
1276 panic!("failed to find version in {}'s Cargo.toml", package)
1279 /// Returns `true` if unstable features should be enabled for the compiler
1281 fn unstable_features(&self) -> bool {
1282 match &self.config.channel[..] {
1283 "stable" | "beta" => false,
1284 "nightly" | _ => true,
1288 /// Returns a Vec of all the dependencies of the given root crate,
1289 /// including transitive dependencies and the root itself. Only includes
1290 /// "local" crates (those in the local source tree, not from a registry).
1291 fn in_tree_crates(&self, root: &str, target: Option<TargetSelection>) -> Vec<&Crate> {
1292 let mut ret = Vec::new();
1293 let mut list = vec![INTERNER.intern_str(root)];
1294 let mut visited = HashSet::new();
1295 while let Some(krate) = list.pop() {
1296 let krate = &self.crates[&krate];
1298 for dep in &krate.deps {
1299 if !self.crates.contains_key(dep) {
1300 // Ignore non-workspace members.
1303 // Don't include optional deps if their features are not
1304 // enabled. Ideally this would be computed from `cargo
1305 // metadata --features …`, but that is somewhat slow. In
1306 // the future, we may want to consider just filtering all
1307 // build and dev dependencies in metadata::build.
1308 if visited.insert(dep)
1309 && (dep != "profiler_builtins"
1311 .map(|t| self.config.profiler_enabled(t))
1312 .unwrap_or_else(|| self.config.any_profiler_enabled()))
1313 && (dep != "rustc_codegen_llvm" || self.config.llvm_enabled())
1322 fn read_stamp_file(&self, stamp: &Path) -> Vec<(PathBuf, DependencyType)> {
1323 if self.config.dry_run {
1327 let mut paths = Vec::new();
1328 let contents = t!(fs::read(stamp), &stamp);
1329 // This is the method we use for extracting paths from the stamp file passed to us. See
1330 // run_cargo for more information (in compile.rs).
1331 for part in contents.split(|b| *b == 0) {
1332 if part.is_empty() {
1335 let dependency_type = match part[0] as char {
1336 'h' => DependencyType::Host,
1337 's' => DependencyType::TargetSelfContained,
1338 't' => DependencyType::Target,
1339 _ => unreachable!(),
1341 let path = PathBuf::from(t!(str::from_utf8(&part[1..])));
1342 paths.push((path, dependency_type));
1347 /// Copies a file from `src` to `dst`
1348 pub fn copy(&self, src: &Path, dst: &Path) {
1349 if self.config.dry_run {
1352 self.verbose_than(1, &format!("Copy {:?} to {:?}", src, dst));
1356 let _ = fs::remove_file(&dst);
1357 let metadata = t!(src.symlink_metadata());
1358 if metadata.file_type().is_symlink() {
1359 let link = t!(fs::read_link(src));
1360 t!(symlink_file(link, dst));
1361 } else if let Ok(()) = fs::hard_link(src, dst) {
1362 // Attempt to "easy copy" by creating a hard link
1363 // (symlinks don't work on windows), but if that fails
1364 // just fall back to a slow `copy` operation.
1366 if let Err(e) = fs::copy(src, dst) {
1367 panic!("failed to copy `{}` to `{}`: {}", src.display(), dst.display(), e)
1369 t!(fs::set_permissions(dst, metadata.permissions()));
1370 let atime = FileTime::from_last_access_time(&metadata);
1371 let mtime = FileTime::from_last_modification_time(&metadata);
1372 t!(filetime::set_file_times(dst, atime, mtime));
1376 /// Copies the `src` directory recursively to `dst`. Both are assumed to exist
1377 /// when this function is called.
1378 pub fn cp_r(&self, src: &Path, dst: &Path) {
1379 if self.config.dry_run {
1382 for f in self.read_dir(src) {
1383 let path = f.path();
1384 let name = path.file_name().unwrap();
1385 let dst = dst.join(name);
1386 if t!(f.file_type()).is_dir() {
1387 t!(fs::create_dir_all(&dst));
1388 self.cp_r(&path, &dst);
1390 let _ = fs::remove_file(&dst);
1391 self.copy(&path, &dst);
1396 /// Copies the `src` directory recursively to `dst`. Both are assumed to exist
1397 /// when this function is called. Unwanted files or directories can be skipped
1398 /// by returning `false` from the filter function.
1399 pub fn cp_filtered(&self, src: &Path, dst: &Path, filter: &dyn Fn(&Path) -> bool) {
1400 // Immediately recurse with an empty relative path
1401 self.recurse_(src, dst, Path::new(""), filter)
1404 // Inner function does the actual work
1405 fn recurse_(&self, src: &Path, dst: &Path, relative: &Path, filter: &dyn Fn(&Path) -> bool) {
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 let relative = relative.join(name);
1411 // Only copy file or directory if the filter function returns true
1412 if filter(&relative) {
1413 if t!(f.file_type()).is_dir() {
1414 let _ = fs::remove_dir_all(&dst);
1415 self.create_dir(&dst);
1416 self.recurse_(&path, &dst, &relative, filter);
1418 let _ = fs::remove_file(&dst);
1419 self.copy(&path, &dst);
1425 fn copy_to_folder(&self, src: &Path, dest_folder: &Path) {
1426 let file_name = src.file_name().unwrap();
1427 let dest = dest_folder.join(file_name);
1428 self.copy(src, &dest);
1431 fn install(&self, src: &Path, dstdir: &Path, perms: u32) {
1432 if self.config.dry_run {
1435 let dst = dstdir.join(src.file_name().unwrap());
1436 self.verbose_than(1, &format!("Install {:?} to {:?}", src, dst));
1437 t!(fs::create_dir_all(dstdir));
1438 drop(fs::remove_file(&dst));
1441 panic!("Error: File \"{}\" not found!", src.display());
1443 let metadata = t!(src.symlink_metadata());
1444 if let Err(e) = fs::copy(&src, &dst) {
1445 panic!("failed to copy `{}` to `{}`: {}", src.display(), dst.display(), e)
1447 t!(fs::set_permissions(&dst, metadata.permissions()));
1448 let atime = FileTime::from_last_access_time(&metadata);
1449 let mtime = FileTime::from_last_modification_time(&metadata);
1450 t!(filetime::set_file_times(&dst, atime, mtime));
1455 fn create(&self, path: &Path, s: &str) {
1456 if self.config.dry_run {
1459 t!(fs::write(path, s));
1462 fn read(&self, path: &Path) -> String {
1463 if self.config.dry_run {
1464 return String::new();
1466 t!(fs::read_to_string(path))
1469 fn create_dir(&self, dir: &Path) {
1470 if self.config.dry_run {
1473 t!(fs::create_dir_all(dir))
1476 fn remove_dir(&self, dir: &Path) {
1477 if self.config.dry_run {
1480 t!(fs::remove_dir_all(dir))
1483 fn read_dir(&self, dir: &Path) -> impl Iterator<Item = fs::DirEntry> {
1484 let iter = match fs::read_dir(dir) {
1486 Err(_) if self.config.dry_run => return vec![].into_iter(),
1487 Err(err) => panic!("could not read dir {:?}: {:?}", dir, err),
1489 iter.map(|e| t!(e)).collect::<Vec<_>>().into_iter()
1492 fn remove(&self, f: &Path) {
1493 if self.config.dry_run {
1496 fs::remove_file(f).unwrap_or_else(|_| panic!("failed to remove {:?}", f));
1499 /// Returns if config.ninja is enabled, and checks for ninja existence,
1500 /// exiting with a nicer error message if not.
1501 fn ninja(&self) -> bool {
1502 let mut cmd_finder = crate::sanity::Finder::new();
1504 if self.config.ninja_in_file {
1505 // Some Linux distros rename `ninja` to `ninja-build`.
1506 // CMake can work with either binary name.
1507 if cmd_finder.maybe_have("ninja-build").is_none()
1508 && cmd_finder.maybe_have("ninja").is_none()
1512 Couldn't find required command: ninja (or ninja-build)
1514 You should install ninja as described at
1515 <https://github.com/ninja-build/ninja/wiki/Pre-built-Ninja-packages>,
1516 or set `ninja = false` in the `[llvm]` section of `config.toml`.
1517 Alternatively, set `download-ci-llvm = true` in that `[llvm]` section
1518 to download LLVM rather than building it.
1521 std::process::exit(1);
1525 // If ninja isn't enabled but we're building for MSVC then we try
1526 // doubly hard to enable it. It was realized in #43767 that the msbuild
1527 // CMake generator for MSVC doesn't respect configuration options like
1528 // disabling LLVM assertions, which can often be quite important!
1530 // In these cases we automatically enable Ninja if we find it in the
1532 if !self.config.ninja_in_file && self.config.build.contains("msvc") {
1533 if cmd_finder.maybe_have("ninja").is_some() {
1538 self.config.ninja_in_file
1543 fn chmod(path: &Path, perms: u32) {
1544 use std::os::unix::fs::*;
1545 t!(fs::set_permissions(path, fs::Permissions::from_mode(perms)));
1548 fn chmod(_path: &Path, _perms: u32) {}
1551 pub fn with_stage(mut self, stage: u32) -> Compiler {
1556 /// Returns `true` if this is a snapshot compiler for `build`'s configuration
1557 pub fn is_snapshot(&self, build: &Build) -> bool {
1558 self.stage == 0 && self.host == build.build
1561 /// Returns if this compiler should be treated as a final stage one in the
1562 /// current build session.
1563 /// This takes into account whether we're performing a full bootstrap or
1564 /// not; don't directly compare the stage with `2`!
1565 pub fn is_final_stage(&self, build: &Build) -> bool {
1566 let final_stage = if build.config.full_bootstrap { 2 } else { 1 };
1567 self.stage >= final_stage
1571 fn envify(s: &str) -> String {
1577 .flat_map(|c| c.to_uppercase())