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 //! ## Uplifiting 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 #![feature(associated_consts)]
118 #![feature(core_intrinsics)]
121 extern crate build_helper;
123 extern crate serde_derive;
125 extern crate serde_json;
127 extern crate filetime;
129 extern crate getopts;
130 extern crate num_cpus;
131 extern crate rustc_serialize;
139 use std::collections::{HashSet, HashMap};
141 use std::fs::{self, File};
143 use std::path::{PathBuf, Path};
144 use std::process::Command;
146 use build_helper::{run_silent, run_suppressed, try_run_silent, try_run_suppressed, output, mtime};
148 use util::{exe, libdir, OutputFolder, CiEnv};
175 pub unsafe fn setup(build: &mut ::Build) {
176 if build.config.low_priority {
177 libc::setpriority(libc::PRIO_PGRP as _, 0, 10);
182 #[cfg(not(any(unix, windows)))]
184 pub unsafe fn setup(_build: &mut ::Build) {
188 pub use config::Config;
189 pub use flags::{Flags, Subcommand};
191 /// A structure representing a Rust compiler.
193 /// Each compiler has a `stage` that it is associated with and a `host` that
194 /// corresponds to the platform the compiler runs on. This structure is used as
195 /// a parameter to many methods below.
196 #[derive(Serialize, Deserialize, Eq, PartialEq, Clone, Copy, Hash, Debug)]
197 pub struct Compiler<'a> {
202 /// Global configuration for the build system.
204 /// This structure transitively contains all configuration for the build system.
205 /// All filesystem-encoded configuration is in `config`, all flags are in
206 /// `flags`, and then parsed or probed information is listed in the keys below.
208 /// This structure is a parameter of almost all methods in the build system,
209 /// although most functions are implemented as free functions rather than
210 /// methods specifically on this structure itself (to make it easier to
213 // User-specified configuration via config.toml
216 // User-specified configuration via CLI flags
219 // Derived properties from the above two configurations
222 rust_info: channel::GitInfo,
223 cargo_info: channel::GitInfo,
224 rls_info: channel::GitInfo,
229 // Targets for which to build.
232 targets: Vec<String>,
234 // Stage 0 (downloaded) compiler and cargo or their local rust equivalents.
235 initial_rustc: PathBuf,
236 initial_cargo: PathBuf,
238 // Probed tools at runtime
239 lldb_version: Option<String>,
240 lldb_python_dir: Option<String>,
242 // Runtime state filled in later on
243 // target -> (cc, ar)
244 cc: HashMap<String, (gcc::Tool, Option<PathBuf>)>,
246 cxx: HashMap<String, gcc::Tool>,
247 crates: HashMap<String, Crate>,
250 delayed_failures: Cell<usize>,
265 /// The various "modes" of invoking Cargo.
267 /// These entries currently correspond to the various output directories of the
268 /// build system, with each mod generating output in a different directory.
269 #[derive(Serialize, Clone, Copy, PartialEq, Eq)]
271 /// Build the standard library, placing output in the "stageN-std" directory.
274 /// Build libtest, placing output in the "stageN-test" directory.
277 /// Build librustc and compiler libraries, placing output in the "stageN-rustc" directory.
280 /// Build some tool, placing output in the "stageN-tools" directory.
285 /// Creates a new set of build configuration from the `flags` on the command
286 /// line and the filesystem `config`.
288 /// By default all build output will be placed in the current directory.
289 pub fn new(flags: Flags, config: Config) -> Build {
290 let cwd = t!(env::current_dir());
291 let src = flags.src.clone();
292 let out = cwd.join("build");
294 let is_sudo = match env::var_os("SUDO_USER") {
296 match env::var_os("USER") {
297 Some(user) => user != sudo_user,
303 let rust_info = channel::GitInfo::new(&src);
304 let cargo_info = channel::GitInfo::new(&src.join("src/tools/cargo"));
305 let rls_info = channel::GitInfo::new(&src.join("src/tools/rls"));
307 let hosts = if !flags.host.is_empty() {
308 for host in flags.host.iter() {
309 if !config.host.contains(host) {
310 panic!("specified host `{}` is not in configuration", host);
317 let targets = if !flags.target.is_empty() {
318 for target in flags.target.iter() {
319 if !config.target.contains(target) {
320 panic!("specified target `{}` is not in configuration", target);
325 config.target.clone()
329 initial_rustc: config.initial_rustc.clone(),
330 initial_cargo: config.initial_cargo.clone(),
331 local_rebuild: config.local_rebuild,
332 fail_fast: flags.cmd.fail_fast(),
333 verbosity: cmp::max(flags.verbose, config.verbose),
335 build: config.host[0].clone(),
344 rust_info: rust_info,
345 cargo_info: cargo_info,
349 crates: HashMap::new(),
351 lldb_python_dir: None,
353 ci_env: CiEnv::current(),
354 delayed_failures: Cell::new(0),
358 /// Executes the entire build, as configured by the flags and configuration.
359 pub fn build(&mut self) {
364 if let Subcommand::Clean = self.flags.cmd {
365 return clean::clean(self);
368 self.verbose("finding compilers");
370 self.verbose("running sanity check");
372 // If local-rust is the same major.minor as the current version, then force a local-rebuild
373 let local_version_verbose = output(
374 Command::new(&self.initial_rustc).arg("--version").arg("--verbose"));
375 let local_release = local_version_verbose
376 .lines().filter(|x| x.starts_with("release:"))
377 .next().unwrap().trim_left_matches("release:").trim();
378 let my_version = channel::CFG_RELEASE_NUM;
379 if local_release.split('.').take(2).eq(my_version.split('.').take(2)) {
380 self.verbose(&format!("auto-detected local-rebuild {}", local_release));
381 self.local_rebuild = true;
383 self.verbose("learning about cargo");
384 metadata::build(self);
386 builder::Builder::run(&self);
389 /// Clear out `dir` if `input` is newer.
391 /// After this executes, it will also ensure that `dir` exists.
392 fn clear_if_dirty(&self, dir: &Path, input: &Path) {
393 let stamp = dir.join(".stamp");
394 if mtime(&stamp) < mtime(input) {
395 self.verbose(&format!("Dirty - {}", dir.display()));
396 let _ = fs::remove_dir_all(dir);
397 } else if stamp.exists() {
400 t!(fs::create_dir_all(dir));
401 t!(File::create(stamp));
404 /// Get the space-separated set of activated features for the standard
406 fn std_features(&self) -> String {
407 let mut features = "panic-unwind".to_string();
409 if self.config.debug_jemalloc {
410 features.push_str(" debug-jemalloc");
412 if self.config.use_jemalloc {
413 features.push_str(" jemalloc");
415 if self.config.backtrace {
416 features.push_str(" backtrace");
418 if self.config.profiler {
419 features.push_str(" profiler");
424 /// Get the space-separated set of activated features for the compiler.
425 fn rustc_features(&self) -> String {
426 let mut features = String::new();
427 if self.config.use_jemalloc {
428 features.push_str(" jemalloc");
433 /// Component directory that Cargo will produce output into (e.g.
435 fn cargo_dir(&self) -> &'static str {
436 if self.config.rust_optimize {"release"} else {"debug"}
439 /// Get the directory for incremental by-products when using the
441 fn incremental_dir(&self, compiler: Compiler) -> PathBuf {
442 self.out.join(compiler.host).join(format!("stage{}-incremental", compiler.stage))
445 /// Returns the libdir where the standard library and other artifacts are
446 /// found for a compiler's sysroot.
447 fn sysroot_libdir(&self, compiler: &Compiler, target: &str) -> PathBuf {
448 if compiler.stage >= 2 {
449 if let Some(ref libdir_relative) = self.config.libdir_relative {
450 return self.sysroot(compiler).join(libdir_relative)
451 .join("rustlib").join(target).join("lib")
454 self.sysroot(compiler).join("lib").join("rustlib")
455 .join(target).join("lib")
458 /// Returns the root directory for all output generated in a particular
459 /// stage when running with a particular host compiler.
461 /// The mode indicates what the root directory is for.
462 fn stage_out(&self, compiler: Compiler, mode: Mode) -> PathBuf {
463 let suffix = match mode {
464 Mode::Libstd => "-std",
465 Mode::Libtest => "-test",
466 Mode::Tool => "-tools",
467 Mode::Librustc => "-rustc",
469 self.out.join(compiler.host)
470 .join(format!("stage{}{}", compiler.stage, suffix))
473 /// Returns the root output directory for all Cargo output in a given stage,
474 /// running a particular compiler, wehther or not we're building the
475 /// standard library, and targeting the specified architecture.
479 target: &str) -> PathBuf {
480 self.stage_out(compiler, mode).join(target).join(self.cargo_dir())
483 /// Root output directory for LLVM compiled for `target`
485 /// Note that if LLVM is configured externally then the directory returned
486 /// will likely be empty.
487 fn llvm_out(&self, target: &str) -> PathBuf {
488 self.out.join(target).join("llvm")
491 /// Output directory for all documentation for a target
492 fn doc_out(&self, target: &str) -> PathBuf {
493 self.out.join(target).join("doc")
496 /// Output directory for some generated md crate documentation for a target (temporary)
497 fn md_doc_out(&self, target: &str) -> PathBuf {
498 self.out.join(target).join("md-doc")
501 /// Output directory for all crate documentation for a target (temporary)
503 /// The artifacts here are then copied into `doc_out` above.
504 fn crate_doc_out(&self, target: &str) -> PathBuf {
505 self.out.join(target).join("crate-docs")
508 /// Returns true if no custom `llvm-config` is set for the specified target.
510 /// If no custom `llvm-config` was specified then Rust's llvm will be used.
511 fn is_rust_llvm(&self, target: &str) -> bool {
512 match self.config.target_config.get(target) {
513 Some(ref c) => c.llvm_config.is_none(),
518 /// Returns the path to `llvm-config` for the specified target.
520 /// If a custom `llvm-config` was specified for target then that's returned
522 fn llvm_config(&self, target: &str) -> PathBuf {
523 let target_config = self.config.target_config.get(target);
524 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
527 self.llvm_out(&self.config.build).join("bin")
528 .join(exe("llvm-config", target))
532 /// Returns the path to `FileCheck` binary for the specified target
533 fn llvm_filecheck(&self, target: &str) -> PathBuf {
534 let target_config = self.config.target_config.get(target);
535 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
536 let llvm_bindir = output(Command::new(s).arg("--bindir"));
537 Path::new(llvm_bindir.trim()).join(exe("FileCheck", target))
539 let base = self.llvm_out(&self.config.build).join("build");
540 let exe = exe("FileCheck", target);
541 if !self.config.ninja && self.config.build.contains("msvc") {
542 base.join("Release/bin").join(exe)
544 base.join("bin").join(exe)
549 /// Directory for libraries built from C/C++ code and shared between stages.
550 fn native_dir(&self, target: &str) -> PathBuf {
551 self.out.join(target).join("native")
554 /// Root output directory for rust_test_helpers library compiled for
556 fn test_helpers_out(&self, target: &str) -> PathBuf {
557 self.native_dir(target).join("rust-test-helpers")
560 /// Adds the `RUST_TEST_THREADS` env var if necessary
561 fn add_rust_test_threads(&self, cmd: &mut Command) {
562 if env::var_os("RUST_TEST_THREADS").is_none() {
563 cmd.env("RUST_TEST_THREADS", self.jobs().to_string());
567 /// Returns the libdir of the snapshot compiler.
568 fn rustc_snapshot_libdir(&self) -> PathBuf {
569 self.initial_rustc.parent().unwrap().parent().unwrap()
570 .join(libdir(&self.config.build))
573 /// Runs a command, printing out nice contextual information if it fails.
574 fn run(&self, cmd: &mut Command) {
575 self.verbose(&format!("running: {:?}", cmd));
579 /// Runs a command, printing out nice contextual information if it fails.
580 fn run_quiet(&self, cmd: &mut Command) {
581 self.verbose(&format!("running: {:?}", cmd));
585 /// Runs a command, printing out nice contextual information if it fails.
586 /// Exits if the command failed to execute at all, otherwise returns its
587 /// `status.success()`.
588 fn try_run(&self, cmd: &mut Command) -> bool {
589 self.verbose(&format!("running: {:?}", cmd));
593 /// Runs a command, printing out nice contextual information if it fails.
594 /// Exits if the command failed to execute at all, otherwise returns its
595 /// `status.success()`.
596 fn try_run_quiet(&self, cmd: &mut Command) -> bool {
597 self.verbose(&format!("running: {:?}", cmd));
598 try_run_suppressed(cmd)
601 pub fn is_verbose(&self) -> bool {
605 pub fn is_very_verbose(&self) -> bool {
609 /// Prints a message if this build is configured in verbose mode.
610 fn verbose(&self, msg: &str) {
611 if self.is_verbose() {
616 /// Returns the number of parallel jobs that have been configured for this
618 fn jobs(&self) -> u32 {
619 self.flags.jobs.unwrap_or_else(|| num_cpus::get() as u32)
622 /// Returns the path to the C compiler for the target specified.
623 fn cc(&self, target: &str) -> &Path {
624 self.cc[target].0.path()
627 /// Returns a list of flags to pass to the C compiler for the target
629 fn cflags(&self, target: &str) -> Vec<String> {
630 // Filter out -O and /O (the optimization flags) that we picked up from
631 // gcc-rs because the build scripts will determine that for themselves.
632 let mut base = self.cc[target].0.args().iter()
633 .map(|s| s.to_string_lossy().into_owned())
634 .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
635 .collect::<Vec<_>>();
637 // If we're compiling on macOS then we add a few unconditional flags
638 // indicating that we want libc++ (more filled out than libstdc++) and
639 // we want to compile for 10.7. This way we can ensure that
640 // LLVM/jemalloc/etc are all properly compiled.
641 if target.contains("apple-darwin") {
642 base.push("-stdlib=libc++".into());
645 // Work around an apparently bad MinGW / GCC optimization,
646 // See: http://lists.llvm.org/pipermail/cfe-dev/2016-December/051980.html
647 // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78936
648 if target == "i686-pc-windows-gnu" {
649 base.push("-fno-omit-frame-pointer".into());
654 /// Returns the path to the `ar` archive utility for the target specified.
655 fn ar(&self, target: &str) -> Option<&Path> {
656 self.cc[target].1.as_ref().map(|p| &**p)
659 /// Returns the path to the C++ compiler for the target specified.
660 fn cxx(&self, target: &str) -> Result<&Path, String> {
661 match self.cxx.get(target) {
662 Some(p) => Ok(p.path()),
664 "target `{}` is not configured as a host, only as a target",
669 /// Returns flags to pass to the compiler to generate code for `target`.
670 fn rustc_flags(&self, target: &str) -> Vec<String> {
671 // New flags should be added here with great caution!
673 // It's quite unfortunate to **require** flags to generate code for a
674 // target, so it should only be passed here if absolutely necessary!
675 // Most default configuration should be done through target specs rather
676 // than an entry here.
678 let mut base = Vec::new();
679 if target != self.config.build && !target.contains("msvc") &&
680 !target.contains("emscripten") {
681 base.push(format!("-Clinker={}", self.cc(target).display()));
686 /// Returns the "musl root" for this `target`, if defined
687 fn musl_root(&self, target: &str) -> Option<&Path> {
688 self.config.target_config.get(target)
689 .and_then(|t| t.musl_root.as_ref())
690 .or(self.config.musl_root.as_ref())
694 /// Returns whether the target will be tested using the `remote-test-client`
695 /// and `remote-test-server` binaries.
696 fn remote_tested(&self, target: &str) -> bool {
697 self.qemu_rootfs(target).is_some() || target.contains("android") ||
698 env::var_os("TEST_DEVICE_ADDR").is_some()
701 /// Returns the root of the "rootfs" image that this target will be using,
702 /// if one was configured.
704 /// If `Some` is returned then that means that tests for this target are
705 /// emulated with QEMU and binaries will need to be shipped to the emulator.
706 fn qemu_rootfs(&self, target: &str) -> Option<&Path> {
707 self.config.target_config.get(target)
708 .and_then(|t| t.qemu_rootfs.as_ref())
712 /// Path to the python interpreter to use
713 fn python(&self) -> &Path {
714 self.config.python.as_ref().unwrap()
717 /// Tests whether the `compiler` compiling for `target` should be forced to
718 /// use a stage1 compiler instead.
720 /// Currently, by default, the build system does not perform a "full
721 /// bootstrap" by default where we compile the compiler three times.
722 /// Instead, we compile the compiler two times. The final stage (stage2)
723 /// just copies the libraries from the previous stage, which is what this
726 /// Here we return `true` if:
728 /// * The build isn't performing a full bootstrap
729 /// * The `compiler` is in the final stage, 2
730 /// * We're not cross-compiling, so the artifacts are already available in
733 /// When all of these conditions are met the build will lift artifacts from
734 /// the previous stage forward.
735 fn force_use_stage1(&self, compiler: Compiler, target: &str) -> bool {
736 !self.config.full_bootstrap &&
737 compiler.stage >= 2 &&
738 self.config.host.iter().any(|h| h == target)
741 /// Returns the directory that OpenSSL artifacts are compiled into if
742 /// configured to do so.
743 fn openssl_dir(&self, target: &str) -> Option<PathBuf> {
744 // OpenSSL not used on Windows
745 if target.contains("windows") {
747 } else if self.config.openssl_static {
748 Some(self.out.join(target).join("openssl"))
754 /// Returns the directory that OpenSSL artifacts are installed into if
755 /// configured as such.
756 fn openssl_install_dir(&self, target: &str) -> Option<PathBuf> {
757 self.openssl_dir(target).map(|p| p.join("install"))
760 /// Given `num` in the form "a.b.c" return a "release string" which
761 /// describes the release version number.
763 /// For example on nightly this returns "a.b.c-nightly", on beta it returns
764 /// "a.b.c-beta.1" and on stable it just returns "a.b.c".
765 fn release(&self, num: &str) -> String {
766 match &self.config.channel[..] {
767 "stable" => num.to_string(),
768 "beta" => format!("{}-beta{}", num, channel::CFG_PRERELEASE_VERSION),
769 "nightly" => format!("{}-nightly", num),
770 _ => format!("{}-dev", num),
774 /// Returns the value of `release` above for Rust itself.
775 fn rust_release(&self) -> String {
776 self.release(channel::CFG_RELEASE_NUM)
779 /// Returns the "package version" for a component given the `num` release
782 /// The package version is typically what shows up in the names of tarballs.
783 /// For channels like beta/nightly it's just the channel name, otherwise
784 /// it's the `num` provided.
785 fn package_vers(&self, num: &str) -> String {
786 match &self.config.channel[..] {
787 "stable" => num.to_string(),
788 "beta" => "beta".to_string(),
789 "nightly" => "nightly".to_string(),
790 _ => format!("{}-dev", num),
794 /// Returns the value of `package_vers` above for Rust itself.
795 fn rust_package_vers(&self) -> String {
796 self.package_vers(channel::CFG_RELEASE_NUM)
799 /// Returns the value of `package_vers` above for Cargo
800 fn cargo_package_vers(&self) -> String {
801 self.package_vers(&self.release_num("cargo"))
804 /// Returns the value of `package_vers` above for rls
805 fn rls_package_vers(&self) -> String {
806 self.package_vers(&self.release_num("rls"))
809 /// Returns the `version` string associated with this compiler for Rust
812 /// Note that this is a descriptive string which includes the commit date,
813 /// sha, version, etc.
814 fn rust_version(&self) -> String {
815 self.rust_info.version(self, channel::CFG_RELEASE_NUM)
818 /// Returns the `a.b.c` version that the given package is at.
819 fn release_num(&self, package: &str) -> String {
820 let mut toml = String::new();
821 let toml_file_name = self.src.join(&format!("src/tools/{}/Cargo.toml", package));
822 t!(t!(File::open(toml_file_name)).read_to_string(&mut toml));
823 for line in toml.lines() {
824 let prefix = "version = \"";
826 if line.starts_with(prefix) && line.ends_with(suffix) {
827 return line[prefix.len()..line.len() - suffix.len()].to_string()
831 panic!("failed to find version in {}'s Cargo.toml", package)
834 /// Returns whether unstable features should be enabled for the compiler
836 fn unstable_features(&self) -> bool {
837 match &self.config.channel[..] {
838 "stable" | "beta" => false,
839 "nightly" | _ => true,
843 /// Fold the output of the commands after this method into a group. The fold
844 /// ends when the returned object is dropped. Folding can only be used in
845 /// the Travis CI environment.
846 pub fn fold_output<D, F>(&self, name: F) -> Option<OutputFolder>
847 where D: Into<String>, F: FnOnce() -> D
849 if self.ci_env == CiEnv::Travis {
850 Some(OutputFolder::new(name().into()))
856 /// Get a list of crates from a root crate.
858 /// Returns Vec<(crate, path to crate, is_root_crate)>
859 fn crates(&self, root: &str) -> Vec<(&str, &Path)> {
860 let mut ret = Vec::new();
861 let mut list = vec![root];
862 let mut visited = HashSet::new();
863 while let Some(krate) = list.pop() {
864 let krate = &self.crates[krate];
865 // If we can't strip prefix, then out-of-tree path
866 let path = krate.path.strip_prefix(&self.src).unwrap_or(&krate.path);
867 ret.push((&*krate.name, path));
868 for dep in &krate.deps {
869 if visited.insert(dep) && dep != "build_helper" {
878 impl<'a> Compiler<'a> {
879 pub fn with_stage(mut self, stage: u32) -> Compiler<'a> {
884 /// Returns whether this is a snapshot compiler for `build`'s configuration
885 pub fn is_snapshot(&self, build: &Build) -> bool {
886 self.stage == 0 && self.host == build.build
889 /// Returns if this compiler should be treated as a final stage one in the
890 /// current build session.
891 /// This takes into account whether we're performing a full bootstrap or
892 /// not; don't directly compare the stage with `2`!
893 pub fn is_final_stage(&self, build: &Build) -> bool {
894 let final_stage = if build.config.full_bootstrap { 2 } else { 1 };
895 self.stage >= final_stage