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.txt`, 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 #![feature(core_intrinsics)]
107 #![feature(drain_filter)]
109 use std::cell::{RefCell, Cell};
110 use std::collections::{HashSet, HashMap};
112 use std::fs::{self, OpenOptions, File};
113 use std::io::{Seek, SeekFrom, Write, Read};
114 use std::path::{PathBuf, Path};
115 use std::process::{self, Command};
120 use std::os::unix::fs::symlink as symlink_file;
122 use std::os::windows::fs::symlink_file;
125 mtime, output, run, run_suppressed, t, try_run, try_run_suppressed,
127 use filetime::FileTime;
129 use crate::util::{exe, libdir, 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) {
169 pub use crate::config::Config;
170 use crate::flags::Subcommand;
171 use crate::cache::{Interned, INTERNER};
173 const LLVM_TOOLS: &[&str] = &[
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
184 /// A structure representing a Rust compiler.
186 /// Each compiler has a `stage` that it is associated with and a `host` that
187 /// corresponds to the platform the compiler runs on. This structure is used as
188 /// a parameter to many methods below.
189 #[derive(Eq, PartialOrd, Ord, PartialEq, Clone, Copy, Hash, Debug)]
190 pub struct Compiler {
192 host: Interned<String>,
195 #[derive(PartialEq, Eq, Copy, Clone, Debug)]
197 /// Run normal tests and doc tests (default).
199 /// Do not run any doc tests.
201 /// Only run doc tests.
210 /// Global configuration for the build system.
212 /// This structure transitively contains all configuration for the build system.
213 /// All filesystem-encoded configuration is in `config`, all flags are in
214 /// `flags`, and then parsed or probed information is listed in the keys below.
216 /// This structure is a parameter of almost all methods in the build system,
217 /// although most functions are implemented as free functions rather than
218 /// methods specifically on this structure itself (to make it easier to
221 /// User-specified configuration from `config.toml`.
224 // Properties derived from the above configuration
227 rust_info: channel::GitInfo,
228 cargo_info: channel::GitInfo,
229 rls_info: channel::GitInfo,
230 clippy_info: channel::GitInfo,
231 miri_info: channel::GitInfo,
232 rustfmt_info: channel::GitInfo,
233 in_tree_llvm_info: channel::GitInfo,
239 // Targets for which to build
240 build: Interned<String>,
241 hosts: Vec<Interned<String>>,
242 targets: Vec<Interned<String>>,
244 // Stage 0 (downloaded) compiler and cargo or their local rust equivalents
245 initial_rustc: PathBuf,
246 initial_cargo: PathBuf,
248 // Runtime state filled in later on
249 // C/C++ compilers and archiver for all targets
250 cc: HashMap<Interned<String>, cc::Tool>,
251 cxx: HashMap<Interned<String>, cc::Tool>,
252 ar: HashMap<Interned<String>, PathBuf>,
253 ranlib: HashMap<Interned<String>, PathBuf>,
255 crates: HashMap<Interned<String>, Crate>,
258 delayed_failures: RefCell<Vec<String>>,
259 prerelease_version: Cell<Option<u32>>,
260 tool_artifacts: RefCell<HashMap<
262 HashMap<String, (&'static str, PathBuf, Vec<String>)>
268 name: Interned<String>,
269 deps: HashSet<Interned<String>>,
275 fn is_local(&self, build: &Build) -> bool {
276 self.path.starts_with(&build.config.src) &&
277 !self.path.to_string_lossy().ends_with("_shim")
280 fn local_path(&self, build: &Build) -> PathBuf {
281 assert!(self.is_local(build));
282 self.path.strip_prefix(&build.config.src).unwrap().into()
286 /// The various "modes" of invoking Cargo.
288 /// These entries currently correspond to the various output directories of the
289 /// build system, with each mod generating output in a different directory.
290 #[derive(Debug, Hash, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
292 /// Build the standard library, placing output in the "stageN-std" directory.
295 /// Build librustc, and compiler libraries, placing output in the "stageN-rustc" directory.
298 /// Build codegen libraries, placing output in the "stageN-codegen" directory
301 /// Build some tools, placing output in the "stageN-tools" directory. The
302 /// "other" here is for miscellaneous sets of tools that are built using the
303 /// bootstrap compiler in its entirety (target libraries and all).
304 /// Typically these tools compile with stable Rust.
307 /// Compile a tool which uses all libraries we compile (up to rustc).
308 /// Doesn't use the stage0 compiler libraries like "other", and includes
309 /// tools like rustdoc, cargo, rls, etc.
315 pub fn is_tool(&self) -> bool {
317 Mode::ToolBootstrap | Mode::ToolRustc | Mode::ToolStd => true,
324 /// Creates a new set of build configuration from the `flags` on the command
325 /// line and the filesystem `config`.
327 /// By default all build output will be placed in the current directory.
328 pub fn new(config: Config) -> Build {
329 let src = config.src.clone();
330 let out = config.out.clone();
332 let is_sudo = match env::var_os("SUDO_USER") {
334 match env::var_os("USER") {
335 Some(user) => user != sudo_user,
342 let ignore_git = config.ignore_git;
343 let rust_info = channel::GitInfo::new(ignore_git, &src);
344 let cargo_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/cargo"));
345 let rls_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/rls"));
346 let clippy_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/clippy"));
347 let miri_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/miri"));
348 let rustfmt_info = channel::GitInfo::new(ignore_git, &src.join("src/tools/rustfmt"));
350 // we always try to use git for LLVM builds
351 let in_tree_llvm_info = channel::GitInfo::new(false, &src.join("src/llvm-project"));
353 let mut build = Build {
354 initial_rustc: config.initial_rustc.clone(),
355 initial_cargo: config.initial_cargo.clone(),
356 local_rebuild: config.local_rebuild,
357 fail_fast: config.cmd.fail_fast(),
358 doc_tests: config.cmd.doc_tests(),
359 verbosity: config.verbose,
362 hosts: config.hosts.clone(),
363 targets: config.targets.clone(),
379 ranlib: HashMap::new(),
380 crates: HashMap::new(),
382 ci_env: CiEnv::current(),
383 delayed_failures: RefCell::new(Vec::new()),
384 prerelease_version: Cell::new(None),
385 tool_artifacts: Default::default(),
388 build.verbose("finding compilers");
389 cc_detect::find(&mut build);
390 build.verbose("running sanity check");
391 sanity::check(&mut build);
393 // If local-rust is the same major.minor as the current version, then force a
395 let local_version_verbose = output(
396 Command::new(&build.initial_rustc).arg("--version").arg("--verbose"));
397 let local_release = local_version_verbose
398 .lines().filter(|x| x.starts_with("release:"))
399 .next().unwrap().trim_start_matches("release:").trim();
400 let my_version = channel::CFG_RELEASE_NUM;
401 if local_release.split('.').take(2).eq(my_version.split('.').take(2)) {
402 build.verbose(&format!("auto-detected local-rebuild {}", local_release));
403 build.local_rebuild = true;
406 build.verbose("learning about cargo");
407 metadata::build(&mut build);
412 pub fn build_triple(&self) -> &[Interned<String>] {
414 slice::from_raw_parts(&self.build, 1)
418 /// Executes the entire build, as configured by the flags and configuration.
419 pub fn build(&mut self) {
424 if let Subcommand::Clean { all } = self.config.cmd {
425 return clean::clean(self, all);
429 let builder = builder::Builder::new(&self);
430 if let Some(path) = builder.paths.get(0) {
431 if path == Path::new("nonexistent/path/to/trigger/cargo/metadata") {
437 if !self.config.dry_run {
439 self.config.dry_run = true;
440 let builder = builder::Builder::new(&self);
441 builder.execute_cli();
443 self.config.dry_run = false;
444 let builder = builder::Builder::new(&self);
445 builder.execute_cli();
447 let builder = builder::Builder::new(&self);
448 let _ = builder.execute_cli();
451 // Check for postponed failures from `test --no-fail-fast`.
452 let failures = self.delayed_failures.borrow();
453 if failures.len() > 0 {
454 println!("\n{} command(s) did not execute successfully:\n", failures.len());
455 for failure in failures.iter() {
456 println!(" - {}\n", failure);
462 /// Clear out `dir` if `input` is newer.
464 /// After this executes, it will also ensure that `dir` exists.
465 fn clear_if_dirty(&self, dir: &Path, input: &Path) -> bool {
466 let stamp = dir.join(".stamp");
467 let mut cleared = false;
468 if mtime(&stamp) < mtime(input) {
469 self.verbose(&format!("Dirty - {}", dir.display()));
470 let _ = fs::remove_dir_all(dir);
472 } else if stamp.exists() {
475 t!(fs::create_dir_all(dir));
476 t!(File::create(stamp));
480 /// Gets the space-separated set of activated features for the standard
482 fn std_features(&self) -> String {
483 let mut features = "panic-unwind".to_string();
485 if self.config.llvm_libunwind {
486 features.push_str(" llvm-libunwind");
488 if self.config.backtrace {
489 features.push_str(" backtrace");
491 if self.config.profiler {
492 features.push_str(" profiler");
497 /// Gets the space-separated set of activated features for the compiler.
498 fn rustc_features(&self) -> String {
499 let mut features = String::new();
500 if self.config.jemalloc {
501 features.push_str("jemalloc");
503 if self.config.llvm_enabled() {
504 features.push_str(" llvm");
509 /// Component directory that Cargo will produce output into (e.g.
511 fn cargo_dir(&self) -> &'static str {
512 if self.config.rust_optimize {"release"} else {"debug"}
515 fn tools_dir(&self, compiler: Compiler) -> PathBuf {
516 let out = self.out.join(&*compiler.host).join(format!("stage{}-tools-bin", compiler.stage));
517 t!(fs::create_dir_all(&out));
521 /// Returns the root directory for all output generated in a particular
522 /// stage when running with a particular host compiler.
524 /// The mode indicates what the root directory is for.
525 fn stage_out(&self, compiler: Compiler, mode: Mode) -> PathBuf {
526 let suffix = match mode {
528 Mode::Rustc => "-rustc",
529 Mode::Codegen => "-codegen",
530 Mode::ToolBootstrap => "-bootstrap-tools",
531 Mode::ToolStd | Mode::ToolRustc => "-tools",
533 self.out.join(&*compiler.host)
534 .join(format!("stage{}{}", compiler.stage, suffix))
537 /// Returns the root output directory for all Cargo output in a given stage,
538 /// running a particular compiler, whether or not we're building the
539 /// standard library, and targeting the specified architecture.
543 target: Interned<String>) -> PathBuf {
544 self.stage_out(compiler, mode).join(&*target).join(self.cargo_dir())
547 /// Root output directory for LLVM compiled for `target`
549 /// Note that if LLVM is configured externally then the directory returned
550 /// will likely be empty.
551 fn llvm_out(&self, target: Interned<String>) -> PathBuf {
552 self.out.join(&*target).join("llvm")
555 fn lld_out(&self, target: Interned<String>) -> PathBuf {
556 self.out.join(&*target).join("lld")
559 /// Output directory for all documentation for a target
560 fn doc_out(&self, target: Interned<String>) -> PathBuf {
561 self.out.join(&*target).join("doc")
564 /// Output directory for all documentation for a target
565 fn compiler_doc_out(&self, target: Interned<String>) -> PathBuf {
566 self.out.join(&*target).join("compiler-doc")
569 /// Output directory for some generated md crate documentation for a target (temporary)
570 fn md_doc_out(&self, target: Interned<String>) -> Interned<PathBuf> {
571 INTERNER.intern_path(self.out.join(&*target).join("md-doc"))
574 /// Output directory for all crate documentation for a target (temporary)
576 /// The artifacts here are then copied into `doc_out` above.
577 fn crate_doc_out(&self, target: Interned<String>) -> PathBuf {
578 self.out.join(&*target).join("crate-docs")
581 /// Returns `true` if no custom `llvm-config` is set for the specified target.
583 /// If no custom `llvm-config` was specified then Rust's llvm will be used.
584 fn is_rust_llvm(&self, target: Interned<String>) -> bool {
585 match self.config.target_config.get(&target) {
586 Some(ref c) => c.llvm_config.is_none(),
591 /// Returns the path to `FileCheck` binary for the specified target
592 fn llvm_filecheck(&self, target: Interned<String>) -> PathBuf {
593 let target_config = self.config.target_config.get(&target);
594 if let Some(s) = target_config.and_then(|c| c.llvm_filecheck.as_ref()) {
596 } else if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
597 let llvm_bindir = output(Command::new(s).arg("--bindir"));
598 let filecheck = Path::new(llvm_bindir.trim()).join(exe("FileCheck", &*target));
599 if filecheck.exists() {
602 // On Fedora the system LLVM installs FileCheck in the
603 // llvm subdirectory of the libdir.
604 let llvm_libdir = output(Command::new(s).arg("--libdir"));
605 let lib_filecheck = Path::new(llvm_libdir.trim())
606 .join("llvm").join(exe("FileCheck", &*target));
607 if lib_filecheck.exists() {
610 // Return the most normal file name, even though
611 // it doesn't exist, so that any error message
617 let base = self.llvm_out(self.config.build).join("build");
618 let base = if !self.config.ninja && self.config.build.contains("msvc") {
619 if self.config.llvm_optimize {
620 if self.config.llvm_release_debuginfo {
621 base.join("RelWithDebInfo")
631 base.join("bin").join(exe("FileCheck", &*target))
635 /// Directory for libraries built from C/C++ code and shared between stages.
636 fn native_dir(&self, target: Interned<String>) -> PathBuf {
637 self.out.join(&*target).join("native")
640 /// Root output directory for rust_test_helpers library compiled for
642 fn test_helpers_out(&self, target: Interned<String>) -> PathBuf {
643 self.native_dir(target).join("rust-test-helpers")
646 /// Adds the `RUST_TEST_THREADS` env var if necessary
647 fn add_rust_test_threads(&self, cmd: &mut Command) {
648 if env::var_os("RUST_TEST_THREADS").is_none() {
649 cmd.env("RUST_TEST_THREADS", self.jobs().to_string());
653 /// Returns the libdir of the snapshot compiler.
654 fn rustc_snapshot_libdir(&self) -> PathBuf {
655 self.rustc_snapshot_sysroot().join(libdir(&self.config.build))
658 /// Returns the sysroot of the snapshot compiler.
659 fn rustc_snapshot_sysroot(&self) -> &Path {
660 self.initial_rustc.parent().unwrap().parent().unwrap()
663 /// Runs a command, printing out nice contextual information if it fails.
664 fn run(&self, cmd: &mut Command) {
665 if self.config.dry_run { return; }
666 self.verbose(&format!("running: {:?}", cmd));
670 /// Runs a command, printing out nice contextual information if it fails.
671 fn run_quiet(&self, cmd: &mut Command) {
672 if self.config.dry_run { return; }
673 self.verbose(&format!("running: {:?}", cmd));
677 /// Runs a command, printing out nice contextual information if it fails.
678 /// Exits if the command failed to execute at all, otherwise returns its
679 /// `status.success()`.
680 fn try_run(&self, cmd: &mut Command) -> bool {
681 if self.config.dry_run { return true; }
682 self.verbose(&format!("running: {:?}", cmd));
686 /// Runs a command, printing out nice contextual information if it fails.
687 /// Exits if the command failed to execute at all, otherwise returns its
688 /// `status.success()`.
689 fn try_run_quiet(&self, cmd: &mut Command) -> bool {
690 if self.config.dry_run { return true; }
691 self.verbose(&format!("running: {:?}", cmd));
692 try_run_suppressed(cmd)
695 pub fn is_verbose(&self) -> bool {
699 /// Prints a message if this build is configured in verbose mode.
700 fn verbose(&self, msg: &str) {
701 if self.is_verbose() {
706 pub fn is_verbose_than(&self, level: usize) -> bool {
707 self.verbosity > level
710 /// Prints a message if this build is configured in more verbose mode than `level`.
711 fn verbose_than(&self, level: usize, msg: &str) {
712 if self.is_verbose_than(level) {
717 fn info(&self, msg: &str) {
718 if self.config.dry_run { return; }
722 /// Returns the number of parallel jobs that have been configured for this
724 fn jobs(&self) -> u32 {
725 self.config.jobs.unwrap_or_else(|| num_cpus::get() as u32)
728 fn debuginfo_map(&self, which: GitRepo) -> Option<String> {
729 if !self.config.rust_remap_debuginfo {
733 let path = match which {
735 let sha = self.rust_sha().unwrap_or(channel::CFG_RELEASE_NUM);
736 format!("/rustc/{}", sha)
738 GitRepo::Llvm => String::from("/rustc/llvm"),
740 Some(format!("{}={}", self.src.display(), path))
743 /// Returns the path to the C compiler for the target specified.
744 fn cc(&self, target: Interned<String>) -> &Path {
745 self.cc[&target].path()
748 /// Returns a list of flags to pass to the C compiler for the target
750 fn cflags(&self, target: Interned<String>, which: GitRepo) -> Vec<String> {
751 // Filter out -O and /O (the optimization flags) that we picked up from
752 // cc-rs because the build scripts will determine that for themselves.
753 let mut base = self.cc[&target].args().iter()
754 .map(|s| s.to_string_lossy().into_owned())
755 .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
756 .collect::<Vec<String>>();
758 // If we're compiling on macOS then we add a few unconditional flags
759 // indicating that we want libc++ (more filled out than libstdc++) and
760 // we want to compile for 10.7. This way we can ensure that
761 // LLVM/etc are all properly compiled.
762 if target.contains("apple-darwin") {
763 base.push("-stdlib=libc++".into());
766 // Work around an apparently bad MinGW / GCC optimization,
767 // See: http://lists.llvm.org/pipermail/cfe-dev/2016-December/051980.html
768 // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78936
769 if &*target == "i686-pc-windows-gnu" {
770 base.push("-fno-omit-frame-pointer".into());
773 if let Some(map) = self.debuginfo_map(which) {
774 let cc = self.cc(target);
775 if cc.ends_with("clang") || cc.ends_with("gcc") {
776 base.push(format!("-fdebug-prefix-map={}", map));
777 } else if cc.ends_with("clang-cl.exe") {
778 base.push("-Xclang".into());
779 base.push(format!("-fdebug-prefix-map={}", map));
785 /// Returns the path to the `ar` archive utility for the target specified.
786 fn ar(&self, target: Interned<String>) -> Option<&Path> {
787 self.ar.get(&target).map(|p| &**p)
790 /// Returns the path to the `ranlib` utility for the target specified.
791 fn ranlib(&self, target: Interned<String>) -> Option<&Path> {
792 self.ranlib.get(&target).map(|p| &**p)
795 /// Returns the path to the C++ compiler for the target specified.
796 fn cxx(&self, target: Interned<String>) -> Result<&Path, String> {
797 match self.cxx.get(&target) {
798 Some(p) => Ok(p.path()),
800 "target `{}` is not configured as a host, only as a target",
805 /// Returns the path to the linker for the given target if it needs to be overridden.
806 fn linker(&self, target: Interned<String>) -> Option<&Path> {
807 if let Some(linker) = self.config.target_config.get(&target)
808 .and_then(|c| c.linker.as_ref()) {
810 } else if target != self.config.build &&
811 util::use_host_linker(&target) &&
812 !target.contains("msvc") {
813 Some(self.cc(target))
819 /// Returns if this target should statically link the C runtime, if specified
820 fn crt_static(&self, target: Interned<String>) -> Option<bool> {
821 if target.contains("pc-windows-msvc") {
824 self.config.target_config.get(&target)
825 .and_then(|t| t.crt_static)
829 /// Returns the "musl root" for this `target`, if defined
830 fn musl_root(&self, target: Interned<String>) -> Option<&Path> {
831 self.config.target_config.get(&target)
832 .and_then(|t| t.musl_root.as_ref())
833 .or(self.config.musl_root.as_ref())
837 /// Returns the sysroot for the wasi target, if defined
838 fn wasi_root(&self, target: Interned<String>) -> Option<&Path> {
839 self.config.target_config.get(&target)
840 .and_then(|t| t.wasi_root.as_ref())
844 /// Returns `true` if this is a no-std `target`, if defined
845 fn no_std(&self, target: Interned<String>) -> Option<bool> {
846 self.config.target_config.get(&target)
850 /// Returns `true` if the target will be tested using the `remote-test-client`
851 /// and `remote-test-server` binaries.
852 fn remote_tested(&self, target: Interned<String>) -> bool {
853 self.qemu_rootfs(target).is_some() || target.contains("android") ||
854 env::var_os("TEST_DEVICE_ADDR").is_some()
857 /// Returns the root of the "rootfs" image that this target will be using,
858 /// if one was configured.
860 /// If `Some` is returned then that means that tests for this target are
861 /// emulated with QEMU and binaries will need to be shipped to the emulator.
862 fn qemu_rootfs(&self, target: Interned<String>) -> Option<&Path> {
863 self.config.target_config.get(&target)
864 .and_then(|t| t.qemu_rootfs.as_ref())
868 /// Path to the python interpreter to use
869 fn python(&self) -> &Path {
870 self.config.python.as_ref().unwrap()
873 /// Temporary directory that extended error information is emitted to.
874 fn extended_error_dir(&self) -> PathBuf {
875 self.out.join("tmp/extended-error-metadata")
878 /// Tests whether the `compiler` compiling for `target` should be forced to
879 /// use a stage1 compiler instead.
881 /// Currently, by default, the build system does not perform a "full
882 /// bootstrap" by default where we compile the compiler three times.
883 /// Instead, we compile the compiler two times. The final stage (stage2)
884 /// just copies the libraries from the previous stage, which is what this
887 /// Here we return `true` if:
889 /// * The build isn't performing a full bootstrap
890 /// * The `compiler` is in the final stage, 2
891 /// * We're not cross-compiling, so the artifacts are already available in
894 /// When all of these conditions are met the build will lift artifacts from
895 /// the previous stage forward.
896 fn force_use_stage1(&self, compiler: Compiler, target: Interned<String>) -> bool {
897 !self.config.full_bootstrap &&
898 compiler.stage >= 2 &&
899 (self.hosts.iter().any(|h| *h == target) || target == self.build)
902 /// Given `num` in the form "a.b.c" return a "release string" which
903 /// describes the release version number.
905 /// For example on nightly this returns "a.b.c-nightly", on beta it returns
906 /// "a.b.c-beta.1" and on stable it just returns "a.b.c".
907 fn release(&self, num: &str) -> String {
908 match &self.config.channel[..] {
909 "stable" => num.to_string(),
910 "beta" => if self.rust_info.is_git() {
911 format!("{}-beta.{}", num, self.beta_prerelease_version())
913 format!("{}-beta", num)
915 "nightly" => format!("{}-nightly", num),
916 _ => format!("{}-dev", num),
920 fn beta_prerelease_version(&self) -> u32 {
921 if let Some(s) = self.prerelease_version.get() {
930 .current_dir(&self.src)
932 let beta = beta.trim().split_whitespace().next().unwrap();
938 .current_dir(&self.src)
940 let master = master.trim().split_whitespace().next().unwrap();
942 // Figure out where the current beta branch started.
948 .current_dir(&self.src),
950 let base = base.trim();
952 // Next figure out how many merge commits happened since we branched off
953 // beta. That's our beta number!
959 .arg(format!("{}...HEAD", base))
960 .current_dir(&self.src),
962 let n = count.trim().parse().unwrap();
963 self.prerelease_version.set(Some(n));
967 /// Returns the value of `release` above for Rust itself.
968 fn rust_release(&self) -> String {
969 self.release(channel::CFG_RELEASE_NUM)
972 /// Returns the "package version" for a component given the `num` release
975 /// The package version is typically what shows up in the names of tarballs.
976 /// For channels like beta/nightly it's just the channel name, otherwise
977 /// it's the `num` provided.
978 fn package_vers(&self, num: &str) -> String {
979 match &self.config.channel[..] {
980 "stable" => num.to_string(),
981 "beta" => "beta".to_string(),
982 "nightly" => "nightly".to_string(),
983 _ => format!("{}-dev", num),
987 /// Returns the value of `package_vers` above for Rust itself.
988 fn rust_package_vers(&self) -> String {
989 self.package_vers(channel::CFG_RELEASE_NUM)
992 /// Returns the value of `package_vers` above for Cargo
993 fn cargo_package_vers(&self) -> String {
994 self.package_vers(&self.release_num("cargo"))
997 /// Returns the value of `package_vers` above for rls
998 fn rls_package_vers(&self) -> String {
999 self.package_vers(&self.release_num("rls"))
1002 /// Returns the value of `package_vers` above for clippy
1003 fn clippy_package_vers(&self) -> String {
1004 self.package_vers(&self.release_num("clippy"))
1007 /// Returns the value of `package_vers` above for miri
1008 fn miri_package_vers(&self) -> String {
1009 self.package_vers(&self.release_num("miri"))
1012 /// Returns the value of `package_vers` above for rustfmt
1013 fn rustfmt_package_vers(&self) -> String {
1014 self.package_vers(&self.release_num("rustfmt"))
1017 fn llvm_tools_package_vers(&self) -> String {
1018 self.package_vers(channel::CFG_RELEASE_NUM)
1021 fn llvm_tools_vers(&self) -> String {
1025 fn lldb_package_vers(&self) -> String {
1026 self.package_vers(channel::CFG_RELEASE_NUM)
1029 fn lldb_vers(&self) -> String {
1033 fn llvm_link_tools_dynamically(&self, target: Interned<String>) -> bool {
1034 (target.contains("linux-gnu") || target.contains("apple-darwin"))
1037 /// Returns the `version` string associated with this compiler for Rust
1040 /// Note that this is a descriptive string which includes the commit date,
1041 /// sha, version, etc.
1042 fn rust_version(&self) -> String {
1043 self.rust_info.version(self, channel::CFG_RELEASE_NUM)
1046 /// Returns the full commit hash.
1047 fn rust_sha(&self) -> Option<&str> {
1048 self.rust_info.sha()
1051 /// Returns the `a.b.c` version that the given package is at.
1052 fn release_num(&self, package: &str) -> String {
1053 let toml_file_name = self.src.join(&format!("src/tools/{}/Cargo.toml", package));
1054 let toml = t!(fs::read_to_string(&toml_file_name));
1055 for line in toml.lines() {
1056 let prefix = "version = \"";
1058 if line.starts_with(prefix) && line.ends_with(suffix) {
1059 return line[prefix.len()..line.len() - suffix.len()].to_string()
1063 panic!("failed to find version in {}'s Cargo.toml", package)
1066 /// Returns `true` if unstable features should be enabled for the compiler
1068 fn unstable_features(&self) -> bool {
1069 match &self.config.channel[..] {
1070 "stable" | "beta" => false,
1071 "nightly" | _ => true,
1075 fn in_tree_crates(&self, root: &str) -> Vec<&Crate> {
1076 let mut ret = Vec::new();
1077 let mut list = vec![INTERNER.intern_str(root)];
1078 let mut visited = HashSet::new();
1079 while let Some(krate) = list.pop() {
1080 let krate = &self.crates[&krate];
1081 if krate.is_local(self) {
1084 for dep in &krate.deps {
1085 if visited.insert(dep) && dep != "build_helper" {
1093 fn read_stamp_file(&self, stamp: &Path) -> Vec<(PathBuf, bool)> {
1094 if self.config.dry_run {
1098 let mut paths = Vec::new();
1099 let contents = t!(fs::read(stamp), &stamp);
1100 // This is the method we use for extracting paths from the stamp file passed to us. See
1101 // run_cargo for more information (in compile.rs).
1102 for part in contents.split(|b| *b == 0) {
1103 if part.is_empty() {
1106 let host = part[0] as char == 'h';
1107 let path = PathBuf::from(t!(str::from_utf8(&part[1..])));
1108 paths.push((path, host));
1113 /// Copies a file from `src` to `dst`
1114 pub fn copy(&self, src: &Path, dst: &Path) {
1115 if self.config.dry_run { return; }
1116 self.verbose_than(1, &format!("Copy {:?} to {:?}", src, dst));
1117 if src == dst { return; }
1118 let _ = fs::remove_file(&dst);
1119 let metadata = t!(src.symlink_metadata());
1120 if metadata.file_type().is_symlink() {
1121 let link = t!(fs::read_link(src));
1122 t!(symlink_file(link, dst));
1123 } else if let Ok(()) = fs::hard_link(src, dst) {
1124 // Attempt to "easy copy" by creating a hard link
1125 // (symlinks don't work on windows), but if that fails
1126 // just fall back to a slow `copy` operation.
1128 if let Err(e) = fs::copy(src, dst) {
1129 panic!("failed to copy `{}` to `{}`: {}", src.display(),
1132 t!(fs::set_permissions(dst, metadata.permissions()));
1133 let atime = FileTime::from_last_access_time(&metadata);
1134 let mtime = FileTime::from_last_modification_time(&metadata);
1135 t!(filetime::set_file_times(dst, atime, mtime));
1139 /// Search-and-replaces within a file. (Not maximally efficiently: allocates a
1140 /// new string for each replacement.)
1141 pub fn replace_in_file(&self, path: &Path, replacements: &[(&str, &str)]) {
1142 if self.config.dry_run { return; }
1143 let mut contents = String::new();
1144 let mut file = t!(OpenOptions::new().read(true).write(true).open(path));
1145 t!(file.read_to_string(&mut contents));
1146 for &(target, replacement) in replacements {
1147 contents = contents.replace(target, replacement);
1149 t!(file.seek(SeekFrom::Start(0)));
1150 t!(file.set_len(0));
1151 t!(file.write_all(contents.as_bytes()));
1154 /// Copies the `src` directory recursively to `dst`. Both are assumed to exist
1155 /// when this function is called.
1156 pub fn cp_r(&self, src: &Path, dst: &Path) {
1157 if self.config.dry_run { return; }
1158 for f in self.read_dir(src) {
1159 let path = f.path();
1160 let name = path.file_name().unwrap();
1161 let dst = dst.join(name);
1162 if t!(f.file_type()).is_dir() {
1163 t!(fs::create_dir_all(&dst));
1164 self.cp_r(&path, &dst);
1166 let _ = fs::remove_file(&dst);
1167 self.copy(&path, &dst);
1172 /// Copies the `src` directory recursively to `dst`. Both are assumed to exist
1173 /// when this function is called. Unwanted files or directories can be skipped
1174 /// by returning `false` from the filter function.
1175 pub fn cp_filtered(&self, src: &Path, dst: &Path, filter: &dyn Fn(&Path) -> bool) {
1176 // Immediately recurse with an empty relative path
1177 self.recurse_(src, dst, Path::new(""), filter)
1180 // Inner function does the actual work
1181 fn recurse_(&self, src: &Path, dst: &Path, relative: &Path, filter: &dyn Fn(&Path) -> bool) {
1182 for f in self.read_dir(src) {
1183 let path = f.path();
1184 let name = path.file_name().unwrap();
1185 let dst = dst.join(name);
1186 let relative = relative.join(name);
1187 // Only copy file or directory if the filter function returns true
1188 if filter(&relative) {
1189 if t!(f.file_type()).is_dir() {
1190 let _ = fs::remove_dir_all(&dst);
1191 self.create_dir(&dst);
1192 self.recurse_(&path, &dst, &relative, filter);
1194 let _ = fs::remove_file(&dst);
1195 self.copy(&path, &dst);
1201 fn copy_to_folder(&self, src: &Path, dest_folder: &Path) {
1202 let file_name = src.file_name().unwrap();
1203 let dest = dest_folder.join(file_name);
1204 self.copy(src, &dest);
1207 fn install(&self, src: &Path, dstdir: &Path, perms: u32) {
1208 if self.config.dry_run { return; }
1209 let dst = dstdir.join(src.file_name().unwrap());
1210 self.verbose_than(1, &format!("Install {:?} to {:?}", src, dst));
1211 t!(fs::create_dir_all(dstdir));
1212 drop(fs::remove_file(&dst));
1215 panic!("Error: File \"{}\" not found!", src.display());
1217 let metadata = t!(src.symlink_metadata());
1218 if let Err(e) = fs::copy(&src, &dst) {
1219 panic!("failed to copy `{}` to `{}`: {}", src.display(),
1222 t!(fs::set_permissions(&dst, metadata.permissions()));
1223 let atime = FileTime::from_last_access_time(&metadata);
1224 let mtime = FileTime::from_last_modification_time(&metadata);
1225 t!(filetime::set_file_times(&dst, atime, mtime));
1230 fn create(&self, path: &Path, s: &str) {
1231 if self.config.dry_run { return; }
1232 t!(fs::write(path, s));
1235 fn read(&self, path: &Path) -> String {
1236 if self.config.dry_run { return String::new(); }
1237 t!(fs::read_to_string(path))
1240 fn create_dir(&self, dir: &Path) {
1241 if self.config.dry_run { return; }
1242 t!(fs::create_dir_all(dir))
1245 fn remove_dir(&self, dir: &Path) {
1246 if self.config.dry_run { return; }
1247 t!(fs::remove_dir_all(dir))
1250 fn read_dir(&self, dir: &Path) -> impl Iterator<Item=fs::DirEntry> {
1251 let iter = match fs::read_dir(dir) {
1253 Err(_) if self.config.dry_run => return vec![].into_iter(),
1254 Err(err) => panic!("could not read dir {:?}: {:?}", dir, err),
1256 iter.map(|e| t!(e)).collect::<Vec<_>>().into_iter()
1259 fn remove(&self, f: &Path) {
1260 if self.config.dry_run { return; }
1261 fs::remove_file(f).unwrap_or_else(|_| panic!("failed to remove {:?}", f));
1266 fn chmod(path: &Path, perms: u32) {
1267 use std::os::unix::fs::*;
1268 t!(fs::set_permissions(path, fs::Permissions::from_mode(perms)));
1271 fn chmod(_path: &Path, _perms: u32) {}
1275 pub fn with_stage(mut self, stage: u32) -> Compiler {
1280 /// Returns `true` if this is a snapshot compiler for `build`'s configuration
1281 pub fn is_snapshot(&self, build: &Build) -> bool {
1282 self.stage == 0 && self.host == build.build
1285 /// Returns if this compiler should be treated as a final stage one in the
1286 /// current build session.
1287 /// This takes into account whether we're performing a full bootstrap or
1288 /// not; don't directly compare the stage with `2`!
1289 pub fn is_final_stage(&self, build: &Build) -> bool {
1290 let final_stage = if build.config.full_bootstrap { 2 } else { 1 };
1291 self.stage >= final_stage
1295 fn envify(s: &str) -> String {
1301 .flat_map(|c| c.to_uppercase())