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 //! Although this build system defers most of the complicated logic to Cargo
27 //! itself, it still needs to maintain a list of targets and dependencies which
28 //! it can itself perform. Rustbuild is made up of a list of rules with
29 //! dependencies amongst them (created in the `step` module) and then knows how
30 //! to execute each in sequence. Each time rustbuild is invoked, it will simply
31 //! iterate through this list of steps and execute each serially in turn. For
32 //! each step rustbuild relies on the step internally being incremental and
33 //! parallel. Note, though, that the `-j` parameter to rustbuild gets forwarded
34 //! to appropriate test harnesses and such.
36 //! Most of the "meaty" steps that matter are backed by Cargo, which does indeed
37 //! have its own parallelism and incremental management. Later steps, like
38 //! tests, aren't incremental and simply run the entire suite currently.
40 //! When you execute `x.py build`, the steps which are executed are:
42 //! * First, the python script is run. This will automatically download the
43 //! stage0 rustc and cargo according to `src/stage0.txt`, or using the cached
44 //! versions if they're available. These are then used to compile rustbuild
45 //! itself (using Cargo). Finally, control is then transferred to rustbuild.
47 //! * Rustbuild takes over, performs sanity checks, probes the environment,
48 //! reads configuration, builds up a list of steps, and then starts executing
51 //! * The stage0 libstd is compiled
52 //! * The stage0 libtest is compiled
53 //! * The stage0 librustc is compiled
54 //! * The stage1 compiler is assembled
55 //! * The stage1 libstd, libtest, librustc are compiled
56 //! * The stage2 compiler is assembled
57 //! * The stage2 libstd, libtest, librustc are compiled
59 //! Each step is driven by a separate Cargo project and rustbuild orchestrates
60 //! copying files between steps and otherwise preparing for Cargo to run.
62 //! ## Further information
64 //! More documentation can be found in each respective module below, and you can
65 //! also check out the `src/bootstrap/README.md` file for more information.
70 extern crate build_helper;
72 extern crate filetime;
75 extern crate num_cpus;
76 extern crate rustc_serialize;
84 use std::collections::HashMap;
86 use std::ffi::OsString;
87 use std::fs::{self, File};
89 use std::path::{PathBuf, Path};
90 use std::process::Command;
92 use build_helper::{run_silent, run_suppressed, try_run_silent, try_run_suppressed, output, mtime};
94 use util::{exe, libdir, add_lib_path, OutputFolder, CiEnv};
119 pub unsafe fn setup(build: &mut ::Build) {
120 if build.config.low_priority {
121 libc::setpriority(libc::PRIO_PGRP as _, 0, 10);
126 #[cfg(not(any(unix, windows)))]
128 pub unsafe fn setup(_build: &mut ::Build) {
132 pub use config::Config;
133 pub use flags::{Flags, Subcommand};
135 /// A structure representing a Rust compiler.
137 /// Each compiler has a `stage` that it is associated with and a `host` that
138 /// corresponds to the platform the compiler runs on. This structure is used as
139 /// a parameter to many methods below.
140 #[derive(Eq, PartialEq, Clone, Copy, Hash, Debug)]
141 pub struct Compiler<'a> {
146 /// Global configuration for the build system.
148 /// This structure transitively contains all configuration for the build system.
149 /// All filesystem-encoded configuration is in `config`, all flags are in
150 /// `flags`, and then parsed or probed information is listed in the keys below.
152 /// This structure is a parameter of almost all methods in the build system,
153 /// although most functions are implemented as free functions rather than
154 /// methods specifically on this structure itself (to make it easier to
157 // User-specified configuration via config.toml
160 // User-specified configuration via CLI flags
163 // Derived properties from the above two configurations
168 rust_info: channel::GitInfo,
169 cargo_info: channel::GitInfo,
170 rls_info: channel::GitInfo,
173 // Probed tools at runtime
174 lldb_version: Option<String>,
175 lldb_python_dir: Option<String>,
177 // Runtime state filled in later on
178 cc: HashMap<String, (gcc::Tool, Option<PathBuf>)>,
179 cxx: HashMap<String, gcc::Tool>,
180 crates: HashMap<String, Crate>,
184 delayed_failures: Cell<usize>,
199 /// The various "modes" of invoking Cargo.
201 /// These entries currently correspond to the various output directories of the
202 /// build system, with each mod generating output in a different directory.
203 #[derive(Clone, Copy, PartialEq, Eq)]
205 /// This cargo is going to build the standard library, placing output in the
206 /// "stageN-std" directory.
209 /// This cargo is going to build libtest, placing output in the
210 /// "stageN-test" directory.
213 /// This cargo is going to build librustc and compiler libraries, placing
214 /// output in the "stageN-rustc" directory.
217 /// This cargo is going to build some tool, placing output in the
218 /// "stageN-tools" directory.
223 /// Creates a new set of build configuration from the `flags` on the command
224 /// line and the filesystem `config`.
226 /// By default all build output will be placed in the current directory.
227 pub fn new(flags: Flags, config: Config) -> Build {
228 let cwd = t!(env::current_dir());
229 let src = flags.src.clone().or_else(|| {
230 env::var_os("SRC").map(|x| x.into())
231 }).unwrap_or(cwd.clone());
232 let out = cwd.join("build");
234 let stage0_root = out.join(&config.build).join("stage0/bin");
235 let rustc = match config.rustc {
236 Some(ref s) => PathBuf::from(s),
237 None => stage0_root.join(exe("rustc", &config.build)),
239 let cargo = match config.cargo {
240 Some(ref s) => PathBuf::from(s),
241 None => stage0_root.join(exe("cargo", &config.build)),
243 let local_rebuild = config.local_rebuild;
245 let is_sudo = match env::var_os("SUDO_USER") {
247 match env::var_os("USER") {
248 Some(user) => user != sudo_user,
254 let rust_info = channel::GitInfo::new(&src);
255 let cargo_info = channel::GitInfo::new(&src.join("src/tools/cargo"));
256 let rls_info = channel::GitInfo::new(&src.join("src/tools/rls"));
257 let src_is_git = src.join(".git").exists();
267 rust_info: rust_info,
268 cargo_info: cargo_info,
270 local_rebuild: local_rebuild,
273 crates: HashMap::new(),
275 lldb_python_dir: None,
277 src_is_git: src_is_git,
278 ci_env: CiEnv::current(),
279 delayed_failures: Cell::new(0),
283 /// Executes the entire build, as configured by the flags and configuration.
284 pub fn build(&mut self) {
289 if let Subcommand::Clean = self.flags.cmd {
290 return clean::clean(self);
293 self.verbose("finding compilers");
295 self.verbose("running sanity check");
297 // If local-rust is the same major.minor as the current version, then force a local-rebuild
298 let local_version_verbose = output(
299 Command::new(&self.rustc).arg("--version").arg("--verbose"));
300 let local_release = local_version_verbose
301 .lines().filter(|x| x.starts_with("release:"))
302 .next().unwrap().trim_left_matches("release:").trim();
303 let my_version = channel::CFG_RELEASE_NUM;
304 if local_release.split('.').take(2).eq(my_version.split('.').take(2)) {
305 self.verbose(&format!("auto-detected local-rebuild {}", local_release));
306 self.local_rebuild = true;
308 self.verbose("learning about cargo");
309 metadata::build(self);
314 /// Clear out `dir` if `input` is newer.
316 /// After this executes, it will also ensure that `dir` exists.
317 fn clear_if_dirty(&self, dir: &Path, input: &Path) {
318 let stamp = dir.join(".stamp");
319 if mtime(&stamp) < mtime(input) {
320 self.verbose(&format!("Dirty - {}", dir.display()));
321 let _ = fs::remove_dir_all(dir);
322 } else if stamp.exists() {
325 t!(fs::create_dir_all(dir));
326 t!(File::create(stamp));
329 /// Prepares an invocation of `cargo` to be run.
331 /// This will create a `Command` that represents a pending execution of
332 /// Cargo. This cargo will be configured to use `compiler` as the actual
333 /// rustc compiler, its output will be scoped by `mode`'s output directory,
334 /// it will pass the `--target` flag for the specified `target`, and will be
335 /// executing the Cargo command `cmd`.
340 cmd: &str) -> Command {
341 let mut cargo = Command::new(&self.cargo);
342 let out_dir = self.stage_out(compiler, mode);
343 cargo.env("CARGO_TARGET_DIR", out_dir)
345 .arg("-j").arg(self.jobs().to_string())
346 .arg("--target").arg(target);
348 // FIXME: Temporary fix for https://github.com/rust-lang/cargo/issues/3005
349 // Force cargo to output binaries with disambiguating hashes in the name
350 cargo.env("__CARGO_DEFAULT_LIB_METADATA", &self.config.channel);
353 if compiler.stage == 0 && self.local_rebuild {
354 // Assume the local-rebuild rustc already has stage1 features.
357 stage = compiler.stage;
360 // Customize the compiler we're running. Specify the compiler to cargo
361 // as our shim and then pass it some various options used to configure
362 // how the actual compiler itself is called.
364 // These variables are primarily all read by
365 // src/bootstrap/bin/{rustc.rs,rustdoc.rs}
366 cargo.env("RUSTBUILD_NATIVE_DIR", self.native_dir(target))
367 .env("RUSTC", self.out.join("bootstrap/debug/rustc"))
368 .env("RUSTC_REAL", self.compiler_path(compiler))
369 .env("RUSTC_STAGE", stage.to_string())
370 .env("RUSTC_CODEGEN_UNITS",
371 self.config.rust_codegen_units.to_string())
372 .env("RUSTC_DEBUG_ASSERTIONS",
373 self.config.rust_debug_assertions.to_string())
374 .env("RUSTC_SYSROOT", self.sysroot(compiler))
375 .env("RUSTC_LIBDIR", self.rustc_libdir(compiler))
376 .env("RUSTC_RPATH", self.config.rust_rpath.to_string())
377 .env("RUSTDOC", self.out.join("bootstrap/debug/rustdoc"))
378 .env("RUSTDOC_REAL", self.rustdoc(compiler))
379 .env("RUSTC_FLAGS", self.rustc_flags(target).join(" "));
381 if mode != Mode::Tool {
382 // Tools don't get debuginfo right now, e.g. cargo and rls don't
383 // get compiled with debuginfo.
384 cargo.env("RUSTC_DEBUGINFO", self.config.rust_debuginfo.to_string())
385 .env("RUSTC_DEBUGINFO_LINES", self.config.rust_debuginfo_lines.to_string())
386 .env("RUSTC_FORCE_UNSTABLE", "1");
388 // Currently the compiler depends on crates from crates.io, and
389 // then other crates can depend on the compiler (e.g. proc-macro
390 // crates). Let's say, for example that rustc itself depends on the
391 // bitflags crate. If an external crate then depends on the
392 // bitflags crate as well, we need to make sure they don't
393 // conflict, even if they pick the same verison of bitflags. We'll
394 // want to make sure that e.g. a plugin and rustc each get their
395 // own copy of bitflags.
397 // Cargo ensures that this works in general through the -C metadata
398 // flag. This flag will frob the symbols in the binary to make sure
399 // they're different, even though the source code is the exact
400 // same. To solve this problem for the compiler we extend Cargo's
401 // already-passed -C metadata flag with our own. Our rustc.rs
402 // wrapper around the actual rustc will detect -C metadata being
403 // passed and frob it with this extra string we're passing in.
404 cargo.env("RUSTC_METADATA_SUFFIX", "rustc");
407 // Enable usage of unstable features
408 cargo.env("RUSTC_BOOTSTRAP", "1");
409 self.add_rust_test_threads(&mut cargo);
411 // Almost all of the crates that we compile as part of the bootstrap may
412 // have a build script, including the standard library. To compile a
413 // build script, however, it itself needs a standard library! This
414 // introduces a bit of a pickle when we're compiling the standard
417 // To work around this we actually end up using the snapshot compiler
418 // (stage0) for compiling build scripts of the standard library itself.
419 // The stage0 compiler is guaranteed to have a libstd available for use.
421 // For other crates, however, we know that we've already got a standard
422 // library up and running, so we can use the normal compiler to compile
423 // build scripts in that situation.
424 if mode == Mode::Libstd {
425 cargo.env("RUSTC_SNAPSHOT", &self.rustc)
426 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_snapshot_libdir());
428 cargo.env("RUSTC_SNAPSHOT", self.compiler_path(compiler))
429 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_libdir(compiler));
432 // Ignore incremental modes except for stage0, since we're
433 // not guaranteeing correctness across builds if the compiler
434 // is changing under your feet.`
435 if self.flags.incremental && compiler.stage == 0 {
436 let incr_dir = self.incremental_dir(compiler);
437 cargo.env("RUSTC_INCREMENTAL", incr_dir);
440 if let Some(ref on_fail) = self.flags.on_fail {
441 cargo.env("RUSTC_ON_FAIL", on_fail);
444 let verbose = cmp::max(self.config.verbose, self.flags.verbose);
445 cargo.env("RUSTC_VERBOSE", format!("{}", verbose));
447 // Specify some various options for build scripts used throughout
450 // FIXME: the guard against msvc shouldn't need to be here
451 if !target.contains("msvc") {
452 cargo.env(format!("CC_{}", target), self.cc(target))
453 .env(format!("AR_{}", target), self.ar(target).unwrap()) // only msvc is None
454 .env(format!("CFLAGS_{}", target), self.cflags(target).join(" "));
456 if let Ok(cxx) = self.cxx(target) {
457 cargo.env(format!("CXX_{}", target), cxx);
461 if self.config.extended && compiler.is_final_stage(self) {
462 cargo.env("RUSTC_SAVE_ANALYSIS", "api".to_string());
465 // When being built Cargo will at some point call `nmake.exe` on Windows
466 // MSVC. Unfortunately `nmake` will read these two environment variables
467 // below and try to intepret them. We're likely being run, however, from
468 // MSYS `make` which uses the same variables.
470 // As a result, to prevent confusion and errors, we remove these
471 // variables from our environment to prevent passing MSYS make flags to
472 // nmake, causing it to blow up.
473 if cfg!(target_env = "msvc") {
474 cargo.env_remove("MAKE");
475 cargo.env_remove("MAKEFLAGS");
478 // Environment variables *required* throughout the build
480 // FIXME: should update code to not require this env var
481 cargo.env("CFG_COMPILER_HOST_TRIPLE", target);
483 if self.config.verbose() || self.flags.verbose() {
486 // FIXME: cargo bench does not accept `--release`
487 if self.config.rust_optimize && cmd != "bench" {
488 cargo.arg("--release");
490 if self.config.locked_deps {
491 cargo.arg("--locked");
493 if self.config.vendor || self.is_sudo {
494 cargo.arg("--frozen");
497 self.ci_env.force_coloring_in_ci(&mut cargo);
502 /// Get a path to the compiler specified.
503 fn compiler_path(&self, compiler: &Compiler) -> PathBuf {
504 if compiler.is_snapshot(self) {
507 self.sysroot(compiler).join("bin").join(exe("rustc", compiler.host))
511 /// Get the specified tool built by the specified compiler
512 fn tool(&self, compiler: &Compiler, tool: &str) -> PathBuf {
513 self.cargo_out(compiler, Mode::Tool, compiler.host)
514 .join(exe(tool, compiler.host))
517 /// Get the `rustdoc` executable next to the specified compiler
518 fn rustdoc(&self, compiler: &Compiler) -> PathBuf {
519 let mut rustdoc = self.compiler_path(compiler);
521 rustdoc.push(exe("rustdoc", compiler.host));
525 /// Get a `Command` which is ready to run `tool` in `stage` built for
527 fn tool_cmd(&self, compiler: &Compiler, tool: &str) -> Command {
528 let mut cmd = Command::new(self.tool(&compiler, tool));
529 self.prepare_tool_cmd(compiler, &mut cmd);
533 /// Prepares the `cmd` provided to be able to run the `compiler` provided.
535 /// Notably this munges the dynamic library lookup path to point to the
536 /// right location to run `compiler`.
537 fn prepare_tool_cmd(&self, compiler: &Compiler, cmd: &mut Command) {
538 let host = compiler.host;
539 let mut paths = vec![
540 self.sysroot_libdir(compiler, compiler.host),
541 self.cargo_out(compiler, Mode::Tool, host).join("deps"),
544 // On MSVC a tool may invoke a C compiler (e.g. compiletest in run-make
545 // mode) and that C compiler may need some extra PATH modification. Do
547 if compiler.host.contains("msvc") {
548 let curpaths = env::var_os("PATH").unwrap_or(OsString::new());
549 let curpaths = env::split_paths(&curpaths).collect::<Vec<_>>();
550 for &(ref k, ref v) in self.cc[compiler.host].0.env() {
554 for path in env::split_paths(v) {
555 if !curpaths.contains(&path) {
561 add_lib_path(paths, cmd);
564 /// Get the space-separated set of activated features for the standard
566 fn std_features(&self) -> String {
567 let mut features = "panic-unwind".to_string();
569 if self.config.debug_jemalloc {
570 features.push_str(" debug-jemalloc");
572 if self.config.use_jemalloc {
573 features.push_str(" jemalloc");
575 if self.config.backtrace {
576 features.push_str(" backtrace");
578 if self.config.profiler {
579 features.push_str(" profiler");
584 /// Get the space-separated set of activated features for the compiler.
585 fn rustc_features(&self) -> String {
586 let mut features = String::new();
587 if self.config.use_jemalloc {
588 features.push_str(" jemalloc");
593 /// Component directory that Cargo will produce output into (e.g.
595 fn cargo_dir(&self) -> &'static str {
596 if self.config.rust_optimize {"release"} else {"debug"}
599 /// Returns the sysroot for the `compiler` specified that *this build system
602 /// That is, the sysroot for the stage0 compiler is not what the compiler
603 /// thinks it is by default, but it's the same as the default for stages
605 fn sysroot(&self, compiler: &Compiler) -> PathBuf {
606 if compiler.stage == 0 {
607 self.out.join(compiler.host).join("stage0-sysroot")
609 self.out.join(compiler.host).join(format!("stage{}", compiler.stage))
613 /// Get the directory for incremental by-products when using the
615 fn incremental_dir(&self, compiler: &Compiler) -> PathBuf {
616 self.out.join(compiler.host).join(format!("stage{}-incremental", compiler.stage))
619 /// Returns the libdir where the standard library and other artifacts are
620 /// found for a compiler's sysroot.
621 fn sysroot_libdir(&self, compiler: &Compiler, target: &str) -> PathBuf {
622 self.sysroot(compiler).join("lib").join("rustlib")
623 .join(target).join("lib")
626 /// Returns the root directory for all output generated in a particular
627 /// stage when running with a particular host compiler.
629 /// The mode indicates what the root directory is for.
630 fn stage_out(&self, compiler: &Compiler, mode: Mode) -> PathBuf {
631 let suffix = match mode {
632 Mode::Libstd => "-std",
633 Mode::Libtest => "-test",
634 Mode::Tool => "-tools",
635 Mode::Librustc => "-rustc",
637 self.out.join(compiler.host)
638 .join(format!("stage{}{}", compiler.stage, suffix))
641 /// Returns the root output directory for all Cargo output in a given stage,
642 /// running a particular compiler, wehther or not we're building the
643 /// standard library, and targeting the specified architecture.
647 target: &str) -> PathBuf {
648 self.stage_out(compiler, mode).join(target).join(self.cargo_dir())
651 /// Root output directory for LLVM compiled for `target`
653 /// Note that if LLVM is configured externally then the directory returned
654 /// will likely be empty.
655 fn llvm_out(&self, target: &str) -> PathBuf {
656 self.out.join(target).join("llvm")
659 /// Output directory for all documentation for a target
660 fn doc_out(&self, target: &str) -> PathBuf {
661 self.out.join(target).join("doc")
664 /// Output directory for some generated md crate documentation for a target (temporary)
665 fn md_doc_out(&self, target: &str) -> PathBuf {
666 self.out.join(target).join("md-doc")
669 /// Output directory for all crate documentation for a target (temporary)
671 /// The artifacts here are then copied into `doc_out` above.
672 fn crate_doc_out(&self, target: &str) -> PathBuf {
673 self.out.join(target).join("crate-docs")
676 /// Returns true if no custom `llvm-config` is set for the specified target.
678 /// If no custom `llvm-config` was specified then Rust's llvm will be used.
679 fn is_rust_llvm(&self, target: &str) -> bool {
680 match self.config.target_config.get(target) {
681 Some(ref c) => c.llvm_config.is_none(),
686 /// Returns the path to `llvm-config` for the specified target.
688 /// If a custom `llvm-config` was specified for target then that's returned
690 fn llvm_config(&self, target: &str) -> PathBuf {
691 let target_config = self.config.target_config.get(target);
692 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
695 self.llvm_out(&self.config.build).join("bin")
696 .join(exe("llvm-config", target))
700 /// Returns the path to `FileCheck` binary for the specified target
701 fn llvm_filecheck(&self, target: &str) -> PathBuf {
702 let target_config = self.config.target_config.get(target);
703 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
704 let llvm_bindir = output(Command::new(s).arg("--bindir"));
705 Path::new(llvm_bindir.trim()).join(exe("FileCheck", target))
707 let base = self.llvm_out(&self.config.build).join("build");
708 let exe = exe("FileCheck", target);
709 if !self.config.ninja && self.config.build.contains("msvc") {
710 base.join("Release/bin").join(exe)
712 base.join("bin").join(exe)
717 /// Directory for libraries built from C/C++ code and shared between stages.
718 fn native_dir(&self, target: &str) -> PathBuf {
719 self.out.join(target).join("native")
722 /// Root output directory for rust_test_helpers library compiled for
724 fn test_helpers_out(&self, target: &str) -> PathBuf {
725 self.native_dir(target).join("rust-test-helpers")
728 /// Adds the compiler's directory of dynamic libraries to `cmd`'s dynamic
729 /// library lookup path.
730 fn add_rustc_lib_path(&self, compiler: &Compiler, cmd: &mut Command) {
731 // Windows doesn't need dylib path munging because the dlls for the
732 // compiler live next to the compiler and the system will find them
738 add_lib_path(vec![self.rustc_libdir(compiler)], cmd);
741 /// Adds the `RUST_TEST_THREADS` env var if necessary
742 fn add_rust_test_threads(&self, cmd: &mut Command) {
743 if env::var_os("RUST_TEST_THREADS").is_none() {
744 cmd.env("RUST_TEST_THREADS", self.jobs().to_string());
748 /// Returns the compiler's libdir where it stores the dynamic libraries that
749 /// it itself links against.
751 /// For example this returns `<sysroot>/lib` on Unix and `<sysroot>/bin` on
753 fn rustc_libdir(&self, compiler: &Compiler) -> PathBuf {
754 if compiler.is_snapshot(self) {
755 self.rustc_snapshot_libdir()
757 self.sysroot(compiler).join(libdir(compiler.host))
761 /// Returns the libdir of the snapshot compiler.
762 fn rustc_snapshot_libdir(&self) -> PathBuf {
763 self.rustc.parent().unwrap().parent().unwrap()
764 .join(libdir(&self.config.build))
767 /// Runs a command, printing out nice contextual information if it fails.
768 fn run(&self, cmd: &mut Command) {
769 self.verbose(&format!("running: {:?}", cmd));
773 /// Runs a command, printing out nice contextual information if it fails.
774 fn run_quiet(&self, cmd: &mut Command) {
775 self.verbose(&format!("running: {:?}", cmd));
779 /// Runs a command, printing out nice contextual information if it fails.
780 /// Exits if the command failed to execute at all, otherwise returns its
781 /// `status.success()`.
782 fn try_run(&self, cmd: &mut Command) -> bool {
783 self.verbose(&format!("running: {:?}", cmd));
787 /// Runs a command, printing out nice contextual information if it fails.
788 /// Exits if the command failed to execute at all, otherwise returns its
789 /// `status.success()`.
790 fn try_run_quiet(&self, cmd: &mut Command) -> bool {
791 self.verbose(&format!("running: {:?}", cmd));
792 try_run_suppressed(cmd)
795 /// Prints a message if this build is configured in verbose mode.
796 fn verbose(&self, msg: &str) {
797 if self.flags.verbose() || self.config.verbose() {
802 /// Returns the number of parallel jobs that have been configured for this
804 fn jobs(&self) -> u32 {
805 self.flags.jobs.unwrap_or(num_cpus::get() as u32)
808 /// Returns the path to the C compiler for the target specified.
809 fn cc(&self, target: &str) -> &Path {
810 self.cc[target].0.path()
813 /// Returns a list of flags to pass to the C compiler for the target
815 fn cflags(&self, target: &str) -> Vec<String> {
816 // Filter out -O and /O (the optimization flags) that we picked up from
817 // gcc-rs because the build scripts will determine that for themselves.
818 let mut base = self.cc[target].0.args().iter()
819 .map(|s| s.to_string_lossy().into_owned())
820 .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
821 .collect::<Vec<_>>();
823 // If we're compiling on macOS then we add a few unconditional flags
824 // indicating that we want libc++ (more filled out than libstdc++) and
825 // we want to compile for 10.7. This way we can ensure that
826 // LLVM/jemalloc/etc are all properly compiled.
827 if target.contains("apple-darwin") {
828 base.push("-stdlib=libc++".into());
831 // Work around an apparently bad MinGW / GCC optimization,
832 // See: http://lists.llvm.org/pipermail/cfe-dev/2016-December/051980.html
833 // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78936
834 if target == "i686-pc-windows-gnu" {
835 base.push("-fno-omit-frame-pointer".into());
840 /// Returns the path to the `ar` archive utility for the target specified.
841 fn ar(&self, target: &str) -> Option<&Path> {
842 self.cc[target].1.as_ref().map(|p| &**p)
845 /// Returns the path to the C++ compiler for the target specified.
846 fn cxx(&self, target: &str) -> Result<&Path, String> {
847 match self.cxx.get(target) {
848 Some(p) => Ok(p.path()),
850 "target `{}` is not configured as a host, only as a target",
855 /// Returns flags to pass to the compiler to generate code for `target`.
856 fn rustc_flags(&self, target: &str) -> Vec<String> {
857 // New flags should be added here with great caution!
859 // It's quite unfortunate to **require** flags to generate code for a
860 // target, so it should only be passed here if absolutely necessary!
861 // Most default configuration should be done through target specs rather
862 // than an entry here.
864 let mut base = Vec::new();
865 if target != self.config.build && !target.contains("msvc") &&
866 !target.contains("emscripten") {
867 base.push(format!("-Clinker={}", self.cc(target).display()));
872 /// Returns the "musl root" for this `target`, if defined
873 fn musl_root(&self, target: &str) -> Option<&Path> {
874 self.config.target_config.get(target)
875 .and_then(|t| t.musl_root.as_ref())
876 .or(self.config.musl_root.as_ref())
880 /// Returns whether the target will be tested using the `remote-test-client`
881 /// and `remote-test-server` binaries.
882 fn remote_tested(&self, target: &str) -> bool {
883 self.qemu_rootfs(target).is_some() || target.contains("android")
886 /// Returns the root of the "rootfs" image that this target will be using,
887 /// if one was configured.
889 /// If `Some` is returned then that means that tests for this target are
890 /// emulated with QEMU and binaries will need to be shipped to the emulator.
891 fn qemu_rootfs(&self, target: &str) -> Option<&Path> {
892 self.config.target_config.get(target)
893 .and_then(|t| t.qemu_rootfs.as_ref())
897 /// Path to the python interpreter to use
898 fn python(&self) -> &Path {
899 self.config.python.as_ref().unwrap()
902 /// Tests whether the `compiler` compiling for `target` should be forced to
903 /// use a stage1 compiler instead.
905 /// Currently, by default, the build system does not perform a "full
906 /// bootstrap" by default where we compile the compiler three times.
907 /// Instead, we compile the compiler two times. The final stage (stage2)
908 /// just copies the libraries from the previous stage, which is what this
911 /// Here we return `true` if:
913 /// * The build isn't performing a full bootstrap
914 /// * The `compiler` is in the final stage, 2
915 /// * We're not cross-compiling, so the artifacts are already available in
918 /// When all of these conditions are met the build will lift artifacts from
919 /// the previous stage forward.
920 fn force_use_stage1(&self, compiler: &Compiler, target: &str) -> bool {
921 !self.config.full_bootstrap &&
922 compiler.stage >= 2 &&
923 self.config.host.iter().any(|h| h == target)
926 /// Returns the directory that OpenSSL artifacts are compiled into if
927 /// configured to do so.
928 fn openssl_dir(&self, target: &str) -> Option<PathBuf> {
929 // OpenSSL not used on Windows
930 if target.contains("windows") {
932 } else if self.config.openssl_static {
933 Some(self.out.join(target).join("openssl"))
939 /// Returns the directory that OpenSSL artifacts are installed into if
940 /// configured as such.
941 fn openssl_install_dir(&self, target: &str) -> Option<PathBuf> {
942 self.openssl_dir(target).map(|p| p.join("install"))
945 /// Given `num` in the form "a.b.c" return a "release string" which
946 /// describes the release version number.
948 /// For example on nightly this returns "a.b.c-nightly", on beta it returns
949 /// "a.b.c-beta.1" and on stable it just returns "a.b.c".
950 fn release(&self, num: &str) -> String {
951 match &self.config.channel[..] {
952 "stable" => num.to_string(),
953 "beta" => format!("{}-beta{}", num, channel::CFG_PRERELEASE_VERSION),
954 "nightly" => format!("{}-nightly", num),
955 _ => format!("{}-dev", num),
959 /// Returns the value of `release` above for Rust itself.
960 fn rust_release(&self) -> String {
961 self.release(channel::CFG_RELEASE_NUM)
964 /// Returns the "package version" for a component given the `num` release
967 /// The package version is typically what shows up in the names of tarballs.
968 /// For channels like beta/nightly it's just the channel name, otherwise
969 /// it's the `num` provided.
970 fn package_vers(&self, num: &str) -> String {
971 match &self.config.channel[..] {
972 "stable" => num.to_string(),
973 "beta" => "beta".to_string(),
974 "nightly" => "nightly".to_string(),
975 _ => format!("{}-dev", num),
979 /// Returns the value of `package_vers` above for Rust itself.
980 fn rust_package_vers(&self) -> String {
981 self.package_vers(channel::CFG_RELEASE_NUM)
984 /// Returns the value of `package_vers` above for Cargo
985 fn cargo_package_vers(&self) -> String {
986 self.package_vers(&self.release_num("cargo"))
989 /// Returns the value of `package_vers` above for rls
990 fn rls_package_vers(&self) -> String {
991 self.package_vers(&self.release_num("rls"))
994 /// Returns the `version` string associated with this compiler for Rust
997 /// Note that this is a descriptive string which includes the commit date,
998 /// sha, version, etc.
999 fn rust_version(&self) -> String {
1000 self.rust_info.version(self, channel::CFG_RELEASE_NUM)
1003 /// Returns the `a.b.c` version that the given package is at.
1004 fn release_num(&self, package: &str) -> String {
1005 let mut toml = String::new();
1006 let toml_file_name = self.src.join(&format!("src/tools/{}/Cargo.toml", package));
1007 t!(t!(File::open(toml_file_name)).read_to_string(&mut toml));
1008 for line in toml.lines() {
1009 let prefix = "version = \"";
1011 if line.starts_with(prefix) && line.ends_with(suffix) {
1012 return line[prefix.len()..line.len() - suffix.len()].to_string()
1016 panic!("failed to find version in {}'s Cargo.toml", package)
1019 /// Returns whether unstable features should be enabled for the compiler
1021 fn unstable_features(&self) -> bool {
1022 match &self.config.channel[..] {
1023 "stable" | "beta" => false,
1024 "nightly" | _ => true,
1028 /// Fold the output of the commands after this method into a group. The fold
1029 /// ends when the returned object is dropped. Folding can only be used in
1030 /// the Travis CI environment.
1031 pub fn fold_output<D, F>(&self, name: F) -> Option<OutputFolder>
1032 where D: Into<String>, F: FnOnce() -> D
1034 if self.ci_env == CiEnv::Travis {
1035 Some(OutputFolder::new(name().into()))
1042 impl<'a> Compiler<'a> {
1043 /// Creates a new complier for the specified stage/host
1044 fn new(stage: u32, host: &'a str) -> Compiler<'a> {
1045 Compiler { stage: stage, host: host }
1048 /// Returns whether this is a snapshot compiler for `build`'s configuration
1049 fn is_snapshot(&self, build: &Build) -> bool {
1050 self.stage == 0 && self.host == build.config.build
1053 /// Returns if this compiler should be treated as a final stage one in the
1054 /// current build session.
1055 /// This takes into account whether we're performing a full bootstrap or
1056 /// not; don't directly compare the stage with `2`!
1057 fn is_final_stage(&self, build: &Build) -> bool {
1058 let final_stage = if build.config.full_bootstrap { 2 } else { 1 };
1059 self.stage >= final_stage