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;
138 use std::collections::{HashSet, HashMap};
140 use std::fs::{self, File};
142 use std::path::{PathBuf, Path};
143 use std::process::Command;
145 use build_helper::{run_silent, run_suppressed, try_run_silent, try_run_suppressed, output, mtime};
147 use util::{exe, libdir, OutputFolder, CiEnv};
174 pub unsafe fn setup(build: &mut ::Build) {
175 if build.config.low_priority {
176 libc::setpriority(libc::PRIO_PGRP as _, 0, 10);
181 #[cfg(not(any(unix, windows)))]
183 pub unsafe fn setup(_build: &mut ::Build) {
187 pub use config::Config;
188 pub use flags::{Flags, Subcommand};
190 /// A structure representing a Rust compiler.
192 /// Each compiler has a `stage` that it is associated with and a `host` that
193 /// corresponds to the platform the compiler runs on. This structure is used as
194 /// a parameter to many methods below.
195 #[derive(Serialize, Deserialize, Eq, PartialEq, Clone, Copy, Hash, Debug)]
196 pub struct Compiler<'a> {
201 /// Global configuration for the build system.
203 /// This structure transitively contains all configuration for the build system.
204 /// All filesystem-encoded configuration is in `config`, all flags are in
205 /// `flags`, and then parsed or probed information is listed in the keys below.
207 /// This structure is a parameter of almost all methods in the build system,
208 /// although most functions are implemented as free functions rather than
209 /// methods specifically on this structure itself (to make it easier to
212 // User-specified configuration via config.toml
215 // User-specified configuration via CLI flags
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.
231 targets: Vec<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<String, (gcc::Tool, Option<PathBuf>)>,
245 cxx: HashMap<String, gcc::Tool>,
246 crates: HashMap<String, Crate>,
249 delayed_failures: Cell<usize>,
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(Serialize, 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(flags: Flags, config: Config) -> Build {
289 let cwd = t!(env::current_dir());
290 let src = flags.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(&src);
303 let cargo_info = channel::GitInfo::new(&src.join("src/tools/cargo"));
304 let rls_info = channel::GitInfo::new(&src.join("src/tools/rls"));
306 let hosts = if !flags.host.is_empty() {
307 for host in flags.host.iter() {
308 if !config.host.contains(host) {
309 panic!("specified host `{}` is not in configuration", host);
316 let targets = if !flags.target.is_empty() {
317 for target in flags.target.iter() {
318 if !config.target.contains(target) {
319 panic!("specified target `{}` is not in configuration", target);
324 config.target.clone()
328 initial_rustc: config.initial_rustc.clone(),
329 initial_cargo: config.initial_cargo.clone(),
330 local_rebuild: config.local_rebuild,
331 fail_fast: flags.cmd.fail_fast(),
332 verbosity: cmp::max(flags.verbose, config.verbose),
334 build: config.host[0].clone(),
343 rust_info: rust_info,
344 cargo_info: cargo_info,
348 crates: HashMap::new(),
350 lldb_python_dir: None,
352 ci_env: CiEnv::current(),
353 delayed_failures: Cell::new(0),
357 /// Executes the entire build, as configured by the flags and configuration.
358 pub fn build(&mut self) {
363 if let Subcommand::Clean = self.flags.cmd {
364 return clean::clean(self);
367 self.verbose("finding compilers");
369 self.verbose("running sanity check");
371 // If local-rust is the same major.minor as the current version, then force a local-rebuild
372 let local_version_verbose = output(
373 Command::new(&self.initial_rustc).arg("--version").arg("--verbose"));
374 let local_release = local_version_verbose
375 .lines().filter(|x| x.starts_with("release:"))
376 .next().unwrap().trim_left_matches("release:").trim();
377 let my_version = channel::CFG_RELEASE_NUM;
378 if local_release.split('.').take(2).eq(my_version.split('.').take(2)) {
379 self.verbose(&format!("auto-detected local-rebuild {}", local_release));
380 self.local_rebuild = true;
382 self.verbose("learning about cargo");
383 metadata::build(self);
385 builder::Builder::run(&self);
388 /// Clear out `dir` if `input` is newer.
390 /// After this executes, it will also ensure that `dir` exists.
391 fn clear_if_dirty(&self, dir: &Path, input: &Path) {
392 let stamp = dir.join(".stamp");
393 if mtime(&stamp) < mtime(input) {
394 self.verbose(&format!("Dirty - {}", dir.display()));
395 let _ = fs::remove_dir_all(dir);
396 } else if stamp.exists() {
399 t!(fs::create_dir_all(dir));
400 t!(File::create(stamp));
403 /// Get the space-separated set of activated features for the standard
405 fn std_features(&self) -> String {
406 let mut features = "panic-unwind".to_string();
408 if self.config.debug_jemalloc {
409 features.push_str(" debug-jemalloc");
411 if self.config.use_jemalloc {
412 features.push_str(" jemalloc");
414 if self.config.backtrace {
415 features.push_str(" backtrace");
417 if self.config.profiler {
418 features.push_str(" profiler");
423 /// Get the space-separated set of activated features for the compiler.
424 fn rustc_features(&self) -> String {
425 let mut features = String::new();
426 if self.config.use_jemalloc {
427 features.push_str(" jemalloc");
432 /// Component directory that Cargo will produce output into (e.g.
434 fn cargo_dir(&self) -> &'static str {
435 if self.config.rust_optimize {"release"} else {"debug"}
438 /// Get the directory for incremental by-products when using the
440 fn incremental_dir(&self, compiler: Compiler) -> PathBuf {
441 self.out.join(compiler.host).join(format!("stage{}-incremental", compiler.stage))
444 /// Returns the libdir where the standard library and other artifacts are
445 /// found for a compiler's sysroot.
446 fn sysroot_libdir(&self, compiler: &Compiler, target: &str) -> PathBuf {
447 if compiler.stage >= 2 {
448 if let Some(ref libdir_relative) = self.config.libdir_relative {
449 return self.sysroot(compiler).join(libdir_relative)
450 .join("rustlib").join(target).join("lib")
453 self.sysroot(compiler).join("lib").join("rustlib")
454 .join(target).join("lib")
457 /// Returns the root directory for all output generated in a particular
458 /// stage when running with a particular host compiler.
460 /// The mode indicates what the root directory is for.
461 fn stage_out(&self, compiler: Compiler, mode: Mode) -> PathBuf {
462 let suffix = match mode {
463 Mode::Libstd => "-std",
464 Mode::Libtest => "-test",
465 Mode::Tool => "-tools",
466 Mode::Librustc => "-rustc",
468 self.out.join(compiler.host)
469 .join(format!("stage{}{}", compiler.stage, suffix))
472 /// Returns the root output directory for all Cargo output in a given stage,
473 /// running a particular compiler, wehther or not we're building the
474 /// standard library, and targeting the specified architecture.
478 target: &str) -> PathBuf {
479 self.stage_out(compiler, mode).join(target).join(self.cargo_dir())
482 /// Root output directory for LLVM compiled for `target`
484 /// Note that if LLVM is configured externally then the directory returned
485 /// will likely be empty.
486 fn llvm_out(&self, target: &str) -> PathBuf {
487 self.out.join(target).join("llvm")
490 /// Output directory for all documentation for a target
491 fn doc_out(&self, target: &str) -> PathBuf {
492 self.out.join(target).join("doc")
495 /// Output directory for some generated md crate documentation for a target (temporary)
496 fn md_doc_out(&self, target: &str) -> PathBuf {
497 self.out.join(target).join("md-doc")
500 /// Output directory for all crate documentation for a target (temporary)
502 /// The artifacts here are then copied into `doc_out` above.
503 fn crate_doc_out(&self, target: &str) -> PathBuf {
504 self.out.join(target).join("crate-docs")
507 /// Returns true if no custom `llvm-config` is set for the specified target.
509 /// If no custom `llvm-config` was specified then Rust's llvm will be used.
510 fn is_rust_llvm(&self, target: &str) -> bool {
511 match self.config.target_config.get(target) {
512 Some(ref c) => c.llvm_config.is_none(),
517 /// Returns the path to `llvm-config` for the specified target.
519 /// If a custom `llvm-config` was specified for target then that's returned
521 fn llvm_config(&self, target: &str) -> PathBuf {
522 let target_config = self.config.target_config.get(target);
523 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
526 self.llvm_out(&self.config.build).join("bin")
527 .join(exe("llvm-config", target))
531 /// Returns the path to `FileCheck` binary for the specified target
532 fn llvm_filecheck(&self, target: &str) -> PathBuf {
533 let target_config = self.config.target_config.get(target);
534 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
535 let llvm_bindir = output(Command::new(s).arg("--bindir"));
536 Path::new(llvm_bindir.trim()).join(exe("FileCheck", target))
538 let base = self.llvm_out(&self.config.build).join("build");
539 let exe = exe("FileCheck", target);
540 if !self.config.ninja && self.config.build.contains("msvc") {
541 base.join("Release/bin").join(exe)
543 base.join("bin").join(exe)
548 /// Directory for libraries built from C/C++ code and shared between stages.
549 fn native_dir(&self, target: &str) -> PathBuf {
550 self.out.join(target).join("native")
553 /// Root output directory for rust_test_helpers library compiled for
555 fn test_helpers_out(&self, target: &str) -> PathBuf {
556 self.native_dir(target).join("rust-test-helpers")
559 /// Adds the `RUST_TEST_THREADS` env var if necessary
560 fn add_rust_test_threads(&self, cmd: &mut Command) {
561 if env::var_os("RUST_TEST_THREADS").is_none() {
562 cmd.env("RUST_TEST_THREADS", self.jobs().to_string());
566 /// Returns the libdir of the snapshot compiler.
567 fn rustc_snapshot_libdir(&self) -> PathBuf {
568 self.initial_rustc.parent().unwrap().parent().unwrap()
569 .join(libdir(&self.config.build))
572 /// Runs a command, printing out nice contextual information if it fails.
573 fn run(&self, cmd: &mut Command) {
574 self.verbose(&format!("running: {:?}", cmd));
578 /// Runs a command, printing out nice contextual information if it fails.
579 fn run_quiet(&self, cmd: &mut Command) {
580 self.verbose(&format!("running: {:?}", cmd));
584 /// Runs a command, printing out nice contextual information if it fails.
585 /// Exits if the command failed to execute at all, otherwise returns its
586 /// `status.success()`.
587 fn try_run(&self, cmd: &mut Command) -> bool {
588 self.verbose(&format!("running: {:?}", cmd));
592 /// Runs a command, printing out nice contextual information if it fails.
593 /// Exits if the command failed to execute at all, otherwise returns its
594 /// `status.success()`.
595 fn try_run_quiet(&self, cmd: &mut Command) -> bool {
596 self.verbose(&format!("running: {:?}", cmd));
597 try_run_suppressed(cmd)
600 pub fn is_verbose(&self) -> bool {
604 pub fn is_very_verbose(&self) -> bool {
608 /// Prints a message if this build is configured in verbose mode.
609 fn verbose(&self, msg: &str) {
610 if self.is_verbose() {
615 /// Returns the number of parallel jobs that have been configured for this
617 fn jobs(&self) -> u32 {
618 self.flags.jobs.unwrap_or_else(|| num_cpus::get() as u32)
621 /// Returns the path to the C compiler for the target specified.
622 fn cc(&self, target: &str) -> &Path {
623 self.cc[target].0.path()
626 /// Returns a list of flags to pass to the C compiler for the target
628 fn cflags(&self, target: &str) -> Vec<String> {
629 // Filter out -O and /O (the optimization flags) that we picked up from
630 // gcc-rs because the build scripts will determine that for themselves.
631 let mut base = self.cc[target].0.args().iter()
632 .map(|s| s.to_string_lossy().into_owned())
633 .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
634 .collect::<Vec<_>>();
636 // If we're compiling on macOS then we add a few unconditional flags
637 // indicating that we want libc++ (more filled out than libstdc++) and
638 // we want to compile for 10.7. This way we can ensure that
639 // LLVM/jemalloc/etc are all properly compiled.
640 if target.contains("apple-darwin") {
641 base.push("-stdlib=libc++".into());
644 // Work around an apparently bad MinGW / GCC optimization,
645 // See: http://lists.llvm.org/pipermail/cfe-dev/2016-December/051980.html
646 // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78936
647 if target == "i686-pc-windows-gnu" {
648 base.push("-fno-omit-frame-pointer".into());
653 /// Returns the path to the `ar` archive utility for the target specified.
654 fn ar(&self, target: &str) -> Option<&Path> {
655 self.cc[target].1.as_ref().map(|p| &**p)
658 /// Returns the path to the C++ compiler for the target specified.
659 fn cxx(&self, target: &str) -> Result<&Path, String> {
660 match self.cxx.get(target) {
661 Some(p) => Ok(p.path()),
663 "target `{}` is not configured as a host, only as a target",
668 /// Returns flags to pass to the compiler to generate code for `target`.
669 fn rustc_flags(&self, target: &str) -> Vec<String> {
670 // New flags should be added here with great caution!
672 // It's quite unfortunate to **require** flags to generate code for a
673 // target, so it should only be passed here if absolutely necessary!
674 // Most default configuration should be done through target specs rather
675 // than an entry here.
677 let mut base = Vec::new();
678 if target != self.config.build && !target.contains("msvc") &&
679 !target.contains("emscripten") {
680 base.push(format!("-Clinker={}", self.cc(target).display()));
685 /// Returns the "musl root" for this `target`, if defined
686 fn musl_root(&self, target: &str) -> Option<&Path> {
687 self.config.target_config.get(target)
688 .and_then(|t| t.musl_root.as_ref())
689 .or(self.config.musl_root.as_ref())
693 /// Returns whether the target will be tested using the `remote-test-client`
694 /// and `remote-test-server` binaries.
695 fn remote_tested(&self, target: &str) -> bool {
696 self.qemu_rootfs(target).is_some() || target.contains("android") ||
697 env::var_os("TEST_DEVICE_ADDR").is_some()
700 /// Returns the root of the "rootfs" image that this target will be using,
701 /// if one was configured.
703 /// If `Some` is returned then that means that tests for this target are
704 /// emulated with QEMU and binaries will need to be shipped to the emulator.
705 fn qemu_rootfs(&self, target: &str) -> Option<&Path> {
706 self.config.target_config.get(target)
707 .and_then(|t| t.qemu_rootfs.as_ref())
711 /// Path to the python interpreter to use
712 fn python(&self) -> &Path {
713 self.config.python.as_ref().unwrap()
716 /// Tests whether the `compiler` compiling for `target` should be forced to
717 /// use a stage1 compiler instead.
719 /// Currently, by default, the build system does not perform a "full
720 /// bootstrap" by default where we compile the compiler three times.
721 /// Instead, we compile the compiler two times. The final stage (stage2)
722 /// just copies the libraries from the previous stage, which is what this
725 /// Here we return `true` if:
727 /// * The build isn't performing a full bootstrap
728 /// * The `compiler` is in the final stage, 2
729 /// * We're not cross-compiling, so the artifacts are already available in
732 /// When all of these conditions are met the build will lift artifacts from
733 /// the previous stage forward.
734 fn force_use_stage1(&self, compiler: Compiler, target: &str) -> bool {
735 !self.config.full_bootstrap &&
736 compiler.stage >= 2 &&
737 self.config.host.iter().any(|h| h == target)
740 /// Returns the directory that OpenSSL artifacts are compiled into if
741 /// configured to do so.
742 fn openssl_dir(&self, target: &str) -> Option<PathBuf> {
743 // OpenSSL not used on Windows
744 if target.contains("windows") {
746 } else if self.config.openssl_static {
747 Some(self.out.join(target).join("openssl"))
753 /// Returns the directory that OpenSSL artifacts are installed into if
754 /// configured as such.
755 fn openssl_install_dir(&self, target: &str) -> Option<PathBuf> {
756 self.openssl_dir(target).map(|p| p.join("install"))
759 /// Given `num` in the form "a.b.c" return a "release string" which
760 /// describes the release version number.
762 /// For example on nightly this returns "a.b.c-nightly", on beta it returns
763 /// "a.b.c-beta.1" and on stable it just returns "a.b.c".
764 fn release(&self, num: &str) -> String {
765 match &self.config.channel[..] {
766 "stable" => num.to_string(),
767 "beta" => format!("{}-beta{}", num, channel::CFG_PRERELEASE_VERSION),
768 "nightly" => format!("{}-nightly", num),
769 _ => format!("{}-dev", num),
773 /// Returns the value of `release` above for Rust itself.
774 fn rust_release(&self) -> String {
775 self.release(channel::CFG_RELEASE_NUM)
778 /// Returns the "package version" for a component given the `num` release
781 /// The package version is typically what shows up in the names of tarballs.
782 /// For channels like beta/nightly it's just the channel name, otherwise
783 /// it's the `num` provided.
784 fn package_vers(&self, num: &str) -> String {
785 match &self.config.channel[..] {
786 "stable" => num.to_string(),
787 "beta" => "beta".to_string(),
788 "nightly" => "nightly".to_string(),
789 _ => format!("{}-dev", num),
793 /// Returns the value of `package_vers` above for Rust itself.
794 fn rust_package_vers(&self) -> String {
795 self.package_vers(channel::CFG_RELEASE_NUM)
798 /// Returns the value of `package_vers` above for Cargo
799 fn cargo_package_vers(&self) -> String {
800 self.package_vers(&self.release_num("cargo"))
803 /// Returns the value of `package_vers` above for rls
804 fn rls_package_vers(&self) -> String {
805 self.package_vers(&self.release_num("rls"))
808 /// Returns the `version` string associated with this compiler for Rust
811 /// Note that this is a descriptive string which includes the commit date,
812 /// sha, version, etc.
813 fn rust_version(&self) -> String {
814 self.rust_info.version(self, channel::CFG_RELEASE_NUM)
817 /// Returns the `a.b.c` version that the given package is at.
818 fn release_num(&self, package: &str) -> String {
819 let mut toml = String::new();
820 let toml_file_name = self.src.join(&format!("src/tools/{}/Cargo.toml", package));
821 t!(t!(File::open(toml_file_name)).read_to_string(&mut toml));
822 for line in toml.lines() {
823 let prefix = "version = \"";
825 if line.starts_with(prefix) && line.ends_with(suffix) {
826 return line[prefix.len()..line.len() - suffix.len()].to_string()
830 panic!("failed to find version in {}'s Cargo.toml", package)
833 /// Returns whether unstable features should be enabled for the compiler
835 fn unstable_features(&self) -> bool {
836 match &self.config.channel[..] {
837 "stable" | "beta" => false,
838 "nightly" | _ => true,
842 /// Fold the output of the commands after this method into a group. The fold
843 /// ends when the returned object is dropped. Folding can only be used in
844 /// the Travis CI environment.
845 pub fn fold_output<D, F>(&self, name: F) -> Option<OutputFolder>
846 where D: Into<String>, F: FnOnce() -> D
848 if self.ci_env == CiEnv::Travis {
849 Some(OutputFolder::new(name().into()))
855 /// Get a list of crates from a root crate.
857 /// Returns Vec<(crate, path to crate, is_root_crate)>
858 fn crates(&self, root: &str) -> Vec<(&str, &Path)> {
859 let mut ret = Vec::new();
860 let mut list = vec![root];
861 let mut visited = HashSet::new();
862 while let Some(krate) = list.pop() {
863 let krate = &self.crates[krate];
864 // If we can't strip prefix, then out-of-tree path
865 let path = krate.path.strip_prefix(&self.src).unwrap_or(&krate.path);
866 ret.push((&*krate.name, path));
867 for dep in &krate.deps {
868 if visited.insert(dep) && dep != "build_helper" {
877 impl<'a> Compiler<'a> {
878 pub fn with_stage(mut self, stage: u32) -> Compiler<'a> {
883 /// Returns whether this is a snapshot compiler for `build`'s configuration
884 pub fn is_snapshot(&self, build: &Build) -> bool {
885 self.stage == 0 && self.host == build.build
888 /// Returns if this compiler should be treated as a final stage one in the
889 /// current build session.
890 /// This takes into account whether we're performing a full bootstrap or
891 /// not; don't directly compare the stage with `2`!
892 pub fn is_final_stage(&self, build: &Build) -> bool {
893 let final_stage = if build.config.full_bootstrap { 2 } else { 1 };
894 self.stage >= final_stage