1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Implementation of rustbuild, the Rust build system.
13 //! This module, and its descendants, are the implementation of the Rust build
14 //! system. Most of this build system is backed by Cargo but the outer layer
15 //! here serves as the ability to orchestrate calling Cargo, sequencing Cargo
16 //! builds, building artifacts like LLVM, etc. The goals of rustbuild are:
18 //! * To be an easily understandable, easily extensible, and maintainable build
20 //! * Leverage standard tools in the Rust ecosystem to build the compiler, aka
21 //! crates.io and Cargo.
22 //! * A standard interface to build across all platforms, including MSVC
26 //! The build system defers most of the complicated logic managing invocations
27 //! of rustc and rustdoc to Cargo itself. However, moving through various stages
28 //! and copying artifacts is still necessary for it to do. Each time rustbuild
29 //! is invoked, it will iterate through the list of predefined steps and execute
30 //! each serially in turn if it matches the paths passed or is a default rule.
31 //! For each step rustbuild relies on the step internally being incremental and
32 //! parallel. Note, though, that the `-j` parameter to rustbuild gets forwarded
33 //! to appropriate test harnesses and such.
35 //! Most of the "meaty" steps that matter are backed by Cargo, which does indeed
36 //! have its own parallelism and incremental management. Later steps, like
37 //! tests, aren't incremental and simply run the entire suite currently.
38 //! However, compiletest itself tries to avoid running tests when the artifacts
39 //! that are involved (mainly the compiler) haven't changed.
41 //! When you execute `x.py build`, the steps which are executed are:
43 //! * First, the python script is run. This will automatically download the
44 //! stage0 rustc and cargo according to `src/stage0.txt`, or use the cached
45 //! versions if they're available. These are then used to compile rustbuild
46 //! itself (using Cargo). Finally, control is then transferred to rustbuild.
48 //! * Rustbuild takes over, performs sanity checks, probes the environment,
49 //! reads configuration, and starts executing steps as it reads the command
50 //! line arguments (paths) or going through the default rules.
52 //! The build output will be something like the following:
54 //! Building stage0 std artifacts
55 //! Copying stage0 std
56 //! Building stage0 test artifacts
57 //! Copying stage0 test
58 //! Building stage0 compiler artifacts
59 //! Copying stage0 rustc
60 //! Assembling stage1 compiler
61 //! Building stage1 std artifacts
62 //! Copying stage1 std
63 //! Building stage1 test artifacts
64 //! Copying stage1 test
65 //! Building stage1 compiler artifacts
66 //! Copying stage1 rustc
67 //! Assembling stage2 compiler
68 //! Uplifting stage1 std
69 //! Uplifting stage1 test
70 //! Uplifting stage1 rustc
72 //! Let's disect that a little:
74 //! ## Building stage0 {std,test,compiler} artifacts
76 //! These steps use the provided (downloaded, usually) compiler to compile the
77 //! local Rust source into libraries we can use.
79 //! ## Copying stage0 {std,test,rustc}
81 //! This copies the build output from Cargo into
82 //! `build/$HOST/stage0-sysroot/lib/rustlib/$ARCH/lib`. FIXME: This step's
83 //! documentation should be expanded -- the information already here may be
86 //! ## Assembling stage1 compiler
88 //! This copies the libraries we built in "building stage0 ... artifacts" into
89 //! the stage1 compiler's lib directory. These are the host libraries that the
90 //! compiler itself uses to run. These aren't actually used by artifacts the new
91 //! compiler generates. This step also copies the rustc and rustdoc binaries we
92 //! generated into build/$HOST/stage/bin.
94 //! The stage1/bin/rustc is a fully functional compiler, but it doesn't yet have
95 //! any libraries to link built binaries or libraries to. The next 3 steps will
96 //! provide those libraries for it; they are mostly equivalent to constructing
97 //! the stage1/bin compiler so we don't go through them individually.
99 //! ## Uplifting stage1 {std,test,rustc}
101 //! This step copies the libraries from the stage1 compiler sysroot into the
102 //! stage2 compiler. This is done to avoid rebuilding the compiler; libraries
103 //! we'd build in this step should be identical (in function, if not necessarily
104 //! identical on disk) so there's no need to recompile the compiler again. Note
105 //! that if you want to, you can enable the full-bootstrap option to change this
108 //! Each step is driven by a separate Cargo project and rustbuild orchestrates
109 //! copying files between steps and otherwise preparing for Cargo to run.
111 //! ## Further information
113 //! More documentation can be found in each respective module below, and you can
114 //! also check out the `src/bootstrap/README.md` file for more information.
117 #![allow(stable_features)]
118 #![feature(associated_consts)]
121 extern crate build_helper;
123 extern crate serde_derive;
125 extern crate lazy_static;
127 extern crate serde_json;
129 extern crate filetime;
131 extern crate getopts;
132 extern crate num_cpus;
139 use std::collections::{HashSet, HashMap};
141 use std::fs::{self, File};
143 use std::path::{PathBuf, Path};
144 use std::process::Command;
147 use build_helper::{run_silent, run_suppressed, try_run_silent, try_run_suppressed, output, mtime};
149 use util::{exe, libdir, OutputFolder, CiEnv};
176 pub unsafe fn setup(build: &mut ::Build) {
177 if build.config.low_priority {
178 libc::setpriority(libc::PRIO_PGRP as _, 0, 10);
183 #[cfg(not(any(unix, windows)))]
185 pub unsafe fn setup(_build: &mut ::Build) {
189 pub use config::Config;
190 use flags::Subcommand;
191 use cache::{Interned, INTERNER};
193 /// A structure representing a Rust compiler.
195 /// Each compiler has a `stage` that it is associated with and a `host` that
196 /// corresponds to the platform the compiler runs on. This structure is used as
197 /// a parameter to many methods below.
198 #[derive(Eq, PartialEq, Clone, Copy, Hash, Debug)]
199 pub struct Compiler {
201 host: Interned<String>,
204 /// Global configuration for the build system.
206 /// This structure transitively contains all configuration for the build system.
207 /// All filesystem-encoded configuration is in `config`, all flags are in
208 /// `flags`, and then parsed or probed information is listed in the keys below.
210 /// This structure is a parameter of almost all methods in the build system,
211 /// although most functions are implemented as free functions rather than
212 /// methods specifically on this structure itself (to make it easier to
215 // User-specified configuration via config.toml
218 // Derived properties from the above two configurations
221 rust_info: channel::GitInfo,
222 cargo_info: channel::GitInfo,
223 rls_info: channel::GitInfo,
228 // Targets for which to build.
229 build: Interned<String>,
230 hosts: Vec<Interned<String>>,
231 targets: Vec<Interned<String>>,
233 // Stage 0 (downloaded) compiler and cargo or their local rust equivalents.
234 initial_rustc: PathBuf,
235 initial_cargo: PathBuf,
237 // Probed tools at runtime
238 lldb_version: Option<String>,
239 lldb_python_dir: Option<String>,
241 // Runtime state filled in later on
242 // target -> (cc, ar)
243 cc: HashMap<Interned<String>, (gcc::Tool, Option<PathBuf>)>,
245 cxx: HashMap<Interned<String>, gcc::Tool>,
246 crates: HashMap<Interned<String>, Crate>,
249 delayed_failures: Cell<usize>,
254 name: Interned<String>,
256 deps: Vec<Interned<String>>,
264 /// The various "modes" of invoking Cargo.
266 /// These entries currently correspond to the various output directories of the
267 /// build system, with each mod generating output in a different directory.
268 #[derive(Debug, Hash, Clone, Copy, PartialEq, Eq)]
270 /// Build the standard library, placing output in the "stageN-std" directory.
273 /// Build libtest, placing output in the "stageN-test" directory.
276 /// Build librustc and compiler libraries, placing output in the "stageN-rustc" directory.
279 /// Build some tool, placing output in the "stageN-tools" directory.
284 /// Creates a new set of build configuration from the `flags` on the command
285 /// line and the filesystem `config`.
287 /// By default all build output will be placed in the current directory.
288 pub fn new(config: Config) -> Build {
289 let cwd = t!(env::current_dir());
290 let src = config.src.clone();
291 let out = cwd.join("build");
293 let is_sudo = match env::var_os("SUDO_USER") {
295 match env::var_os("USER") {
296 Some(user) => user != sudo_user,
302 let rust_info = channel::GitInfo::new(&config, &src);
303 let cargo_info = channel::GitInfo::new(&config, &src.join("src/tools/cargo"));
304 let rls_info = channel::GitInfo::new(&config, &src.join("src/tools/rls"));
307 initial_rustc: config.initial_rustc.clone(),
308 initial_cargo: config.initial_cargo.clone(),
309 local_rebuild: config.local_rebuild,
310 fail_fast: config.cmd.fail_fast(),
311 verbosity: config.verbose,
314 hosts: config.hosts.clone(),
315 targets: config.targets.clone(),
326 crates: HashMap::new(),
328 lldb_python_dir: None,
330 ci_env: CiEnv::current(),
331 delayed_failures: Cell::new(0),
335 pub fn build_triple(&self) -> &[Interned<String>] {
337 slice::from_raw_parts(&self.build, 1)
341 /// Executes the entire build, as configured by the flags and configuration.
342 pub fn build(&mut self) {
347 if let Subcommand::Clean = self.config.cmd {
348 return clean::clean(self);
351 self.verbose("finding compilers");
353 self.verbose("running sanity check");
355 // If local-rust is the same major.minor as the current version, then force a local-rebuild
356 let local_version_verbose = output(
357 Command::new(&self.initial_rustc).arg("--version").arg("--verbose"));
358 let local_release = local_version_verbose
359 .lines().filter(|x| x.starts_with("release:"))
360 .next().unwrap().trim_left_matches("release:").trim();
361 let my_version = channel::CFG_RELEASE_NUM;
362 if local_release.split('.').take(2).eq(my_version.split('.').take(2)) {
363 self.verbose(&format!("auto-detected local-rebuild {}", local_release));
364 self.local_rebuild = true;
366 self.verbose("learning about cargo");
367 metadata::build(self);
369 builder::Builder::run(&self);
372 /// Clear out `dir` if `input` is newer.
374 /// After this executes, it will also ensure that `dir` exists.
375 fn clear_if_dirty(&self, dir: &Path, input: &Path) {
376 let stamp = dir.join(".stamp");
377 if mtime(&stamp) < mtime(input) {
378 self.verbose(&format!("Dirty - {}", dir.display()));
379 let _ = fs::remove_dir_all(dir);
380 } else if stamp.exists() {
383 t!(fs::create_dir_all(dir));
384 t!(File::create(stamp));
387 /// Get the space-separated set of activated features for the standard
389 fn std_features(&self) -> String {
390 let mut features = "panic-unwind".to_string();
392 if self.config.debug_jemalloc {
393 features.push_str(" debug-jemalloc");
395 if self.config.use_jemalloc {
396 features.push_str(" jemalloc");
398 if self.config.backtrace {
399 features.push_str(" backtrace");
401 if self.config.profiler {
402 features.push_str(" profiler");
407 /// Get the space-separated set of activated features for the compiler.
408 fn rustc_features(&self) -> String {
409 let mut features = String::new();
410 if self.config.use_jemalloc {
411 features.push_str(" jemalloc");
413 if self.config.llvm_enabled {
414 features.push_str(" llvm");
419 /// Component directory that Cargo will produce output into (e.g.
421 fn cargo_dir(&self) -> &'static str {
422 if self.config.rust_optimize {"release"} else {"debug"}
425 /// Get the directory for incremental by-products when using the
427 fn incremental_dir(&self, compiler: Compiler) -> PathBuf {
428 self.out.join(&*compiler.host).join(format!("stage{}-incremental", compiler.stage))
431 /// Returns the root directory for all output generated in a particular
432 /// stage when running with a particular host compiler.
434 /// The mode indicates what the root directory is for.
435 fn stage_out(&self, compiler: Compiler, mode: Mode) -> PathBuf {
436 let suffix = match mode {
437 Mode::Libstd => "-std",
438 Mode::Libtest => "-test",
439 Mode::Tool => "-tools",
440 Mode::Librustc => "-rustc",
442 self.out.join(&*compiler.host)
443 .join(format!("stage{}{}", compiler.stage, suffix))
446 /// Returns the root output directory for all Cargo output in a given stage,
447 /// running a particular compiler, whether or not we're building the
448 /// standard library, and targeting the specified architecture.
452 target: Interned<String>) -> PathBuf {
453 self.stage_out(compiler, mode).join(&*target).join(self.cargo_dir())
456 /// Root output directory for LLVM compiled for `target`
458 /// Note that if LLVM is configured externally then the directory returned
459 /// will likely be empty.
460 fn llvm_out(&self, target: Interned<String>) -> PathBuf {
461 self.out.join(&*target).join("llvm")
464 /// Output directory for all documentation for a target
465 fn doc_out(&self, target: Interned<String>) -> PathBuf {
466 self.out.join(&*target).join("doc")
469 /// Output directory for some generated md crate documentation for a target (temporary)
470 fn md_doc_out(&self, target: Interned<String>) -> Interned<PathBuf> {
471 INTERNER.intern_path(self.out.join(&*target).join("md-doc"))
474 /// Output directory for all crate documentation for a target (temporary)
476 /// The artifacts here are then copied into `doc_out` above.
477 fn crate_doc_out(&self, target: Interned<String>) -> PathBuf {
478 self.out.join(&*target).join("crate-docs")
481 /// Returns true if no custom `llvm-config` is set for the specified target.
483 /// If no custom `llvm-config` was specified then Rust's llvm will be used.
484 fn is_rust_llvm(&self, target: Interned<String>) -> bool {
485 match self.config.target_config.get(&target) {
486 Some(ref c) => c.llvm_config.is_none(),
491 /// Returns the path to `llvm-config` for the specified target.
493 /// If a custom `llvm-config` was specified for target then that's returned
495 fn llvm_config(&self, target: Interned<String>) -> PathBuf {
496 let target_config = self.config.target_config.get(&target);
497 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
500 self.llvm_out(self.config.build).join("bin")
501 .join(exe("llvm-config", &*target))
505 /// Returns the path to `FileCheck` binary for the specified target
506 fn llvm_filecheck(&self, target: Interned<String>) -> PathBuf {
507 let target_config = self.config.target_config.get(&target);
508 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
509 let llvm_bindir = output(Command::new(s).arg("--bindir"));
510 Path::new(llvm_bindir.trim()).join(exe("FileCheck", &*target))
512 let base = self.llvm_out(self.config.build).join("build");
513 let exe = exe("FileCheck", &*target);
514 if !self.config.ninja && self.config.build.contains("msvc") {
515 base.join("Release/bin").join(exe)
517 base.join("bin").join(exe)
522 /// Directory for libraries built from C/C++ code and shared between stages.
523 fn native_dir(&self, target: Interned<String>) -> PathBuf {
524 self.out.join(&*target).join("native")
527 /// Root output directory for rust_test_helpers library compiled for
529 fn test_helpers_out(&self, target: Interned<String>) -> PathBuf {
530 self.native_dir(target).join("rust-test-helpers")
533 /// Adds the `RUST_TEST_THREADS` env var if necessary
534 fn add_rust_test_threads(&self, cmd: &mut Command) {
535 if env::var_os("RUST_TEST_THREADS").is_none() {
536 cmd.env("RUST_TEST_THREADS", self.jobs().to_string());
540 /// Returns the libdir of the snapshot compiler.
541 fn rustc_snapshot_libdir(&self) -> PathBuf {
542 self.initial_rustc.parent().unwrap().parent().unwrap()
543 .join(libdir(&self.config.build))
546 /// Runs a command, printing out nice contextual information if it fails.
547 fn run(&self, cmd: &mut Command) {
548 self.verbose(&format!("running: {:?}", cmd));
552 /// Runs a command, printing out nice contextual information if it fails.
553 fn run_quiet(&self, cmd: &mut Command) {
554 self.verbose(&format!("running: {:?}", cmd));
558 /// Runs a command, printing out nice contextual information if it fails.
559 /// Exits if the command failed to execute at all, otherwise returns its
560 /// `status.success()`.
561 fn try_run(&self, cmd: &mut Command) -> bool {
562 self.verbose(&format!("running: {:?}", cmd));
566 /// Runs a command, printing out nice contextual information if it fails.
567 /// Exits if the command failed to execute at all, otherwise returns its
568 /// `status.success()`.
569 fn try_run_quiet(&self, cmd: &mut Command) -> bool {
570 self.verbose(&format!("running: {:?}", cmd));
571 try_run_suppressed(cmd)
574 pub fn is_verbose(&self) -> bool {
578 pub fn is_very_verbose(&self) -> bool {
582 /// Prints a message if this build is configured in verbose mode.
583 fn verbose(&self, msg: &str) {
584 if self.is_verbose() {
589 /// Returns the number of parallel jobs that have been configured for this
591 fn jobs(&self) -> u32 {
592 self.config.jobs.unwrap_or_else(|| num_cpus::get() as u32)
595 /// Returns the path to the C compiler for the target specified.
596 fn cc(&self, target: Interned<String>) -> &Path {
597 self.cc[&target].0.path()
600 /// Returns a list of flags to pass to the C compiler for the target
602 fn cflags(&self, target: Interned<String>) -> Vec<String> {
603 // Filter out -O and /O (the optimization flags) that we picked up from
604 // gcc-rs because the build scripts will determine that for themselves.
605 let mut base = self.cc[&target].0.args().iter()
606 .map(|s| s.to_string_lossy().into_owned())
607 .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
608 .collect::<Vec<_>>();
610 // If we're compiling on macOS then we add a few unconditional flags
611 // indicating that we want libc++ (more filled out than libstdc++) and
612 // we want to compile for 10.7. This way we can ensure that
613 // LLVM/jemalloc/etc are all properly compiled.
614 if target.contains("apple-darwin") {
615 base.push("-stdlib=libc++".into());
618 // Work around an apparently bad MinGW / GCC optimization,
619 // See: http://lists.llvm.org/pipermail/cfe-dev/2016-December/051980.html
620 // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78936
621 if &*target == "i686-pc-windows-gnu" {
622 base.push("-fno-omit-frame-pointer".into());
627 /// Returns the path to the `ar` archive utility for the target specified.
628 fn ar(&self, target: Interned<String>) -> Option<&Path> {
629 self.cc[&target].1.as_ref().map(|p| &**p)
632 /// Returns the path to the C++ compiler for the target specified.
633 fn cxx(&self, target: Interned<String>) -> Result<&Path, String> {
634 match self.cxx.get(&target) {
635 Some(p) => Ok(p.path()),
637 "target `{}` is not configured as a host, only as a target",
642 /// Returns flags to pass to the compiler to generate code for `target`.
643 fn rustc_flags(&self, target: Interned<String>) -> Vec<String> {
644 // New flags should be added here with great caution!
646 // It's quite unfortunate to **require** flags to generate code for a
647 // target, so it should only be passed here if absolutely necessary!
648 // Most default configuration should be done through target specs rather
649 // than an entry here.
651 let mut base = Vec::new();
652 if target != self.config.build && !target.contains("msvc") &&
653 !target.contains("emscripten") {
654 base.push(format!("-Clinker={}", self.cc(target).display()));
659 /// Returns if this target should statically link the C runtime, if specified
660 fn crt_static(&self, target: Interned<String>) -> Option<bool> {
661 if target.contains("pc-windows-msvc") {
664 self.config.target_config.get(&target)
665 .and_then(|t| t.crt_static)
669 /// Returns the "musl root" for this `target`, if defined
670 fn musl_root(&self, target: Interned<String>) -> Option<&Path> {
671 self.config.target_config.get(&target)
672 .and_then(|t| t.musl_root.as_ref())
673 .or(self.config.musl_root.as_ref())
677 /// Returns whether the target will be tested using the `remote-test-client`
678 /// and `remote-test-server` binaries.
679 fn remote_tested(&self, target: Interned<String>) -> bool {
680 self.qemu_rootfs(target).is_some() || target.contains("android") ||
681 env::var_os("TEST_DEVICE_ADDR").is_some()
684 /// Returns the root of the "rootfs" image that this target will be using,
685 /// if one was configured.
687 /// If `Some` is returned then that means that tests for this target are
688 /// emulated with QEMU and binaries will need to be shipped to the emulator.
689 fn qemu_rootfs(&self, target: Interned<String>) -> Option<&Path> {
690 self.config.target_config.get(&target)
691 .and_then(|t| t.qemu_rootfs.as_ref())
695 /// Path to the python interpreter to use
696 fn python(&self) -> &Path {
697 self.config.python.as_ref().unwrap()
700 /// Tests whether the `compiler` compiling for `target` should be forced to
701 /// use a stage1 compiler instead.
703 /// Currently, by default, the build system does not perform a "full
704 /// bootstrap" by default where we compile the compiler three times.
705 /// Instead, we compile the compiler two times. The final stage (stage2)
706 /// just copies the libraries from the previous stage, which is what this
709 /// Here we return `true` if:
711 /// * The build isn't performing a full bootstrap
712 /// * The `compiler` is in the final stage, 2
713 /// * We're not cross-compiling, so the artifacts are already available in
716 /// When all of these conditions are met the build will lift artifacts from
717 /// the previous stage forward.
718 fn force_use_stage1(&self, compiler: Compiler, target: Interned<String>) -> bool {
719 !self.config.full_bootstrap &&
720 compiler.stage >= 2 &&
721 self.hosts.iter().any(|h| *h == target)
724 /// Returns the directory that OpenSSL artifacts are compiled into if
725 /// configured to do so.
726 fn openssl_dir(&self, target: Interned<String>) -> Option<PathBuf> {
727 // OpenSSL not used on Windows
728 if target.contains("windows") {
730 } else if self.config.openssl_static {
731 Some(self.out.join(&*target).join("openssl"))
737 /// Returns the directory that OpenSSL artifacts are installed into if
738 /// configured as such.
739 fn openssl_install_dir(&self, target: Interned<String>) -> Option<PathBuf> {
740 self.openssl_dir(target).map(|p| p.join("install"))
743 /// Given `num` in the form "a.b.c" return a "release string" which
744 /// describes the release version number.
746 /// For example on nightly this returns "a.b.c-nightly", on beta it returns
747 /// "a.b.c-beta.1" and on stable it just returns "a.b.c".
748 fn release(&self, num: &str) -> String {
749 match &self.config.channel[..] {
750 "stable" => num.to_string(),
751 "beta" => format!("{}-beta{}", num, channel::CFG_PRERELEASE_VERSION),
752 "nightly" => format!("{}-nightly", num),
753 _ => format!("{}-dev", num),
757 /// Returns the value of `release` above for Rust itself.
758 fn rust_release(&self) -> String {
759 self.release(channel::CFG_RELEASE_NUM)
762 /// Returns the "package version" for a component given the `num` release
765 /// The package version is typically what shows up in the names of tarballs.
766 /// For channels like beta/nightly it's just the channel name, otherwise
767 /// it's the `num` provided.
768 fn package_vers(&self, num: &str) -> String {
769 match &self.config.channel[..] {
770 "stable" => num.to_string(),
771 "beta" => "beta".to_string(),
772 "nightly" => "nightly".to_string(),
773 _ => format!("{}-dev", num),
777 /// Returns the value of `package_vers` above for Rust itself.
778 fn rust_package_vers(&self) -> String {
779 self.package_vers(channel::CFG_RELEASE_NUM)
782 /// Returns the value of `package_vers` above for Cargo
783 fn cargo_package_vers(&self) -> String {
784 self.package_vers(&self.release_num("cargo"))
787 /// Returns the value of `package_vers` above for rls
788 fn rls_package_vers(&self) -> String {
789 self.package_vers(&self.release_num("rls"))
792 /// Returns the `version` string associated with this compiler for Rust
795 /// Note that this is a descriptive string which includes the commit date,
796 /// sha, version, etc.
797 fn rust_version(&self) -> String {
798 self.rust_info.version(self, channel::CFG_RELEASE_NUM)
801 /// Returns the `a.b.c` version that the given package is at.
802 fn release_num(&self, package: &str) -> String {
803 let mut toml = String::new();
804 let toml_file_name = self.src.join(&format!("src/tools/{}/Cargo.toml", package));
805 t!(t!(File::open(toml_file_name)).read_to_string(&mut toml));
806 for line in toml.lines() {
807 let prefix = "version = \"";
809 if line.starts_with(prefix) && line.ends_with(suffix) {
810 return line[prefix.len()..line.len() - suffix.len()].to_string()
814 panic!("failed to find version in {}'s Cargo.toml", package)
817 /// Returns whether unstable features should be enabled for the compiler
819 fn unstable_features(&self) -> bool {
820 match &self.config.channel[..] {
821 "stable" | "beta" => false,
822 "nightly" | _ => true,
826 /// Fold the output of the commands after this method into a group. The fold
827 /// ends when the returned object is dropped. Folding can only be used in
828 /// the Travis CI environment.
829 pub fn fold_output<D, F>(&self, name: F) -> Option<OutputFolder>
830 where D: Into<String>, F: FnOnce() -> D
832 if self.ci_env == CiEnv::Travis {
833 Some(OutputFolder::new(name().into()))
839 /// Get a list of crates from a root crate.
841 /// Returns Vec<(crate, path to crate, is_root_crate)>
842 fn crates(&self, root: &str) -> Vec<(Interned<String>, &Path)> {
843 let interned = INTERNER.intern_string(root.to_owned());
844 let mut ret = Vec::new();
845 let mut list = vec![interned];
846 let mut visited = HashSet::new();
847 while let Some(krate) = list.pop() {
848 let krate = &self.crates[&krate];
849 // If we can't strip prefix, then out-of-tree path
850 let path = krate.path.strip_prefix(&self.src).unwrap_or(&krate.path);
851 ret.push((krate.name, path));
852 for dep in &krate.deps {
853 if visited.insert(dep) && dep != "build_helper" {
863 pub fn with_stage(mut self, stage: u32) -> Compiler {
868 /// Returns whether this is a snapshot compiler for `build`'s configuration
869 pub fn is_snapshot(&self, build: &Build) -> bool {
870 self.stage == 0 && self.host == build.build
873 /// Returns if this compiler should be treated as a final stage one in the
874 /// current build session.
875 /// This takes into account whether we're performing a full bootstrap or
876 /// not; don't directly compare the stage with `2`!
877 pub fn is_final_stage(&self, build: &Build) -> bool {
878 let final_stage = if build.config.full_bootstrap { 2 } else { 1 };
879 self.stage >= final_stage