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.
67 extern crate build_helper;
69 extern crate filetime;
72 extern crate num_cpus;
73 extern crate rustc_serialize;
76 use std::collections::HashMap;
78 use std::ffi::OsString;
79 use std::fs::{self, File};
80 use std::path::{Component, PathBuf, Path};
81 use std::process::Command;
83 use build_helper::{run_silent, output};
85 use util::{exe, mtime, libdir, add_lib_path};
87 /// A helper macro to `unwrap` a result except also print out details like:
89 /// * The file/line of the panic
90 /// * The expression that failed
91 /// * The error itself
93 /// This is currently used judiciously throughout the build system rather than
94 /// using a `Result` with `try!`, but this may change one day...
96 ($e:expr) => (match $e {
98 Err(e) => panic!("{} failed with {}", stringify!($e), e),
123 pub unsafe fn setup() {}
126 pub use config::Config;
127 pub use flags::{Flags, Subcommand};
129 /// A structure representing a Rust compiler.
131 /// Each compiler has a `stage` that it is associated with and a `host` that
132 /// corresponds to the platform the compiler runs on. This structure is used as
133 /// a parameter to many methods below.
134 #[derive(Eq, PartialEq, Clone, Copy, Hash, Debug)]
135 pub struct Compiler<'a> {
140 /// Global configuration for the build system.
142 /// This structure transitively contains all configuration for the build system.
143 /// All filesystem-encoded configuration is in `config`, all flags are in
144 /// `flags`, and then parsed or probed information is listed in the keys below.
146 /// This structure is a parameter of almost all methods in the build system,
147 /// although most functions are implemented as free functions rather than
148 /// methods specifically on this structure itself (to make it easier to
151 // User-specified configuration via config.toml
154 // User-specified configuration via CLI flags
157 // Derived properties from the above two configurations
163 unstable_features: bool,
164 ver_hash: Option<String>,
165 short_ver_hash: Option<String>,
166 ver_date: Option<String>,
168 package_vers: String,
171 // Probed tools at runtime
172 lldb_version: Option<String>,
173 lldb_python_dir: Option<String>,
175 // Runtime state filled in later on
176 cc: HashMap<String, (gcc::Tool, Option<PathBuf>)>,
177 cxx: HashMap<String, gcc::Tool>,
178 crates: HashMap<String, Crate>,
193 /// The various "modes" of invoking Cargo.
195 /// These entries currently correspond to the various output directories of the
196 /// build system, with each mod generating output in a different directory.
197 #[derive(Clone, Copy)]
199 /// This cargo is going to build the standard library, placing output in the
200 /// "stageN-std" directory.
203 /// This cargo is going to build libtest, placing output in the
204 /// "stageN-test" directory.
207 /// This cargo is going to build librustc and compiler libraries, placing
208 /// output in the "stageN-rustc" directory.
211 /// This cargo is going to some build tool, placing output in the
212 /// "stageN-tools" directory.
217 /// Creates a new set of build configuration from the `flags` on the command
218 /// line and the filesystem `config`.
220 /// By default all build output will be placed in the current directory.
221 pub fn new(flags: Flags, config: Config) -> Build {
222 let cwd = t!(env::current_dir());
223 let src = flags.src.clone().or_else(|| {
224 env::var_os("SRC").map(|x| x.into())
225 }).unwrap_or(cwd.clone());
226 let out = cwd.join("build");
228 let stage0_root = out.join(&config.build).join("stage0/bin");
229 let rustc = match config.rustc {
230 Some(ref s) => PathBuf::from(s),
231 None => stage0_root.join(exe("rustc", &config.build)),
233 let cargo = match config.cargo {
234 Some(ref s) => PathBuf::from(s),
235 None => stage0_root.join(exe("cargo", &config.build)),
237 let local_rebuild = config.local_rebuild;
239 let is_sudo = match env::var_os("SUDO_USER") {
241 match env::var_os("USER") {
242 Some(user) => user != sudo_user,
257 release: String::new(),
258 unstable_features: false,
260 short_ver_hash: None,
262 version: String::new(),
263 local_rebuild: local_rebuild,
264 package_vers: String::new(),
267 crates: HashMap::new(),
269 lldb_python_dir: None,
274 /// Executes the entire build, as configured by the flags and configuration.
275 pub fn build(&mut self) {
280 if let Subcommand::Clean = self.flags.cmd {
281 return clean::clean(self);
284 self.verbose("finding compilers");
286 self.verbose("running sanity check");
288 self.verbose("collecting channel variables");
289 channel::collect(self);
290 // If local-rust is the same major.minor as the current version, then force a local-rebuild
291 let local_version_verbose = output(
292 Command::new(&self.rustc).arg("--version").arg("--verbose"));
293 let local_release = local_version_verbose
294 .lines().filter(|x| x.starts_with("release:"))
295 .next().unwrap().trim_left_matches("release:").trim();
296 if local_release.split('.').take(2).eq(self.release.split('.').take(2)) {
297 self.verbose(&format!("auto-detected local-rebuild {}", local_release));
298 self.local_rebuild = true;
300 self.verbose("updating submodules");
301 self.update_submodules();
302 self.verbose("learning about cargo");
303 metadata::build(self);
308 /// Updates all git submodules that we have.
310 /// This will detect if any submodules are out of date an run the necessary
311 /// commands to sync them all with upstream.
312 fn update_submodules(&self) {
313 struct Submodule<'a> {
319 // The submodule may have staged/unstaged changes
321 // Or could be initialized but never updated
323 // The submodule, itself, has extra commits but those changes haven't been commited to
324 // the (outer) git repository
328 if !self.config.submodules {
331 if fs::metadata(self.src.join(".git")).is_err() {
335 let mut cmd = Command::new("git");
336 cmd.current_dir(&self.src);
339 let git_submodule = || {
340 let mut cmd = Command::new("git");
341 cmd.current_dir(&self.src).arg("submodule");
345 // FIXME: this takes a seriously long time to execute on Windows and a
346 // nontrivial amount of time on Unix, we should have a better way
347 // of detecting whether we need to run all the submodule commands
349 let out = output(git_submodule().arg("status"));
350 let mut submodules = vec![];
351 for line in out.lines() {
352 // NOTE `git submodule status` output looks like this:
354 // -5066b7dcab7e700844b0e2ba71b8af9dc627a59b src/liblibc
355 // +b37ef24aa82d2be3a3cc0fe89bf82292f4ca181c src/compiler-rt (remotes/origin/..)
356 // e058ca661692a8d01f8cf9d35939dfe3105ce968 src/jemalloc (3.6.0-533-ge058ca6)
358 // The first character can be '-', '+' or ' ' and denotes the `State` of the submodule
359 // Right next to this character is the SHA-1 of the submodule HEAD
360 // And after that comes the path to the submodule
361 let path = Path::new(line[1..].split(' ').skip(1).next().unwrap());
362 let state = if line.starts_with('-') {
363 State::NotInitialized
364 } else if line.starts_with('+') {
366 } else if line.starts_with(' ') {
369 panic!("unexpected git submodule state: {:?}", line.chars().next());
372 submodules.push(Submodule { path: path, state: state })
375 self.run(git_submodule().arg("sync"));
377 for submodule in submodules {
378 // If using llvm-root then don't touch the llvm submodule.
379 if submodule.path.components().any(|c| c == Component::Normal("llvm".as_ref())) &&
380 self.config.target_config.get(&self.config.build)
381 .and_then(|c| c.llvm_config.as_ref()).is_some()
386 if submodule.path.components().any(|c| c == Component::Normal("jemalloc".as_ref())) &&
387 !self.config.use_jemalloc
392 // `submodule.path` is the relative path to a submodule (from the repository root)
393 // `submodule_path` is the path to a submodule from the cwd
395 // use `submodule.path` when e.g. executing a submodule specific command from the
397 // use `submodule_path` when e.g. executing a normal git command for the submodule
398 // (set via `current_dir`)
399 let submodule_path = self.src.join(submodule.path);
401 match submodule.state {
402 State::MaybeDirty => {
403 // drop staged changes
404 self.run(git().current_dir(&submodule_path)
405 .args(&["reset", "--hard"]));
406 // drops unstaged changes
407 self.run(git().current_dir(&submodule_path)
408 .args(&["clean", "-fdx"]));
410 State::NotInitialized => {
411 self.run(git_submodule().arg("init").arg(submodule.path));
412 self.run(git_submodule().arg("update").arg(submodule.path));
414 State::OutOfSync => {
415 // drops submodule commits that weren't reported to the (outer) git repository
416 self.run(git_submodule().arg("update").arg(submodule.path));
417 self.run(git().current_dir(&submodule_path)
418 .args(&["reset", "--hard"]));
419 self.run(git().current_dir(&submodule_path)
420 .args(&["clean", "-fdx"]));
426 /// Clear out `dir` if `input` is newer.
428 /// After this executes, it will also ensure that `dir` exists.
429 fn clear_if_dirty(&self, dir: &Path, input: &Path) {
430 let stamp = dir.join(".stamp");
431 if mtime(&stamp) < mtime(input) {
432 self.verbose(&format!("Dirty - {}", dir.display()));
433 let _ = fs::remove_dir_all(dir);
434 } else if stamp.exists() {
437 t!(fs::create_dir_all(dir));
438 t!(File::create(stamp));
441 /// Prepares an invocation of `cargo` to be run.
443 /// This will create a `Command` that represents a pending execution of
444 /// Cargo. This cargo will be configured to use `compiler` as the actual
445 /// rustc compiler, its output will be scoped by `mode`'s output directory,
446 /// it will pass the `--target` flag for the specified `target`, and will be
447 /// executing the Cargo command `cmd`.
452 cmd: &str) -> Command {
453 let mut cargo = Command::new(&self.cargo);
454 let out_dir = self.stage_out(compiler, mode);
455 cargo.env("CARGO_TARGET_DIR", out_dir)
457 .arg("-j").arg(self.jobs().to_string())
458 .arg("--target").arg(target);
460 // FIXME: Temporary fix for https://github.com/rust-lang/cargo/issues/3005
461 // Force cargo to output binaries with disambiguating hashes in the name
462 cargo.env("__CARGO_DEFAULT_LIB_METADATA", "1");
465 if compiler.stage == 0 && self.local_rebuild {
466 // Assume the local-rebuild rustc already has stage1 features.
469 stage = compiler.stage;
472 // Customize the compiler we're running. Specify the compiler to cargo
473 // as our shim and then pass it some various options used to configure
474 // how the actual compiler itself is called.
476 // These variables are primarily all read by
477 // src/bootstrap/bin/{rustc.rs,rustdoc.rs}
478 cargo.env("RUSTC", self.out.join("bootstrap/debug/rustc"))
479 .env("RUSTC_REAL", self.compiler_path(compiler))
480 .env("RUSTC_STAGE", stage.to_string())
481 .env("RUSTC_DEBUGINFO", self.config.rust_debuginfo.to_string())
482 .env("RUSTC_DEBUGINFO_LINES", self.config.rust_debuginfo_lines.to_string())
483 .env("RUSTC_CODEGEN_UNITS",
484 self.config.rust_codegen_units.to_string())
485 .env("RUSTC_DEBUG_ASSERTIONS",
486 self.config.rust_debug_assertions.to_string())
487 .env("RUSTC_SNAPSHOT", &self.rustc)
488 .env("RUSTC_SYSROOT", self.sysroot(compiler))
489 .env("RUSTC_LIBDIR", self.rustc_libdir(compiler))
490 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_snapshot_libdir())
491 .env("RUSTC_RPATH", self.config.rust_rpath.to_string())
492 .env("RUSTDOC", self.out.join("bootstrap/debug/rustdoc"))
493 .env("RUSTDOC_REAL", self.rustdoc(compiler))
494 .env("RUSTC_FLAGS", self.rustc_flags(target).join(" "));
496 // Enable usage of unstable features
497 cargo.env("RUSTC_BOOTSTRAP", "1");
498 self.add_rust_test_threads(&mut cargo);
500 // Specify some various options for build scripts used throughout
503 // FIXME: the guard against msvc shouldn't need to be here
504 if !target.contains("msvc") {
505 cargo.env(format!("CC_{}", target), self.cc(target))
506 .env(format!("AR_{}", target), self.ar(target).unwrap()) // only msvc is None
507 .env(format!("CFLAGS_{}", target), self.cflags(target).join(" "));
510 if self.config.channel == "nightly" && compiler.stage == 2 {
511 cargo.env("RUSTC_SAVE_ANALYSIS", "api".to_string());
514 // Environment variables *required* needed throughout the build
516 // FIXME: should update code to not require this env var
517 cargo.env("CFG_COMPILER_HOST_TRIPLE", target);
519 if self.config.verbose || self.flags.verbose {
522 // FIXME: cargo bench does not accept `--release`
523 if self.config.rust_optimize && cmd != "bench" {
524 cargo.arg("--release");
526 if self.config.vendor || self.is_sudo {
527 cargo.arg("--frozen");
532 /// Get a path to the compiler specified.
533 fn compiler_path(&self, compiler: &Compiler) -> PathBuf {
534 if compiler.is_snapshot(self) {
537 self.sysroot(compiler).join("bin").join(exe("rustc", compiler.host))
541 /// Get the specified tool built by the specified compiler
542 fn tool(&self, compiler: &Compiler, tool: &str) -> PathBuf {
543 self.cargo_out(compiler, Mode::Tool, compiler.host)
544 .join(exe(tool, compiler.host))
547 /// Get the `rustdoc` executable next to the specified compiler
548 fn rustdoc(&self, compiler: &Compiler) -> PathBuf {
549 let mut rustdoc = self.compiler_path(compiler);
551 rustdoc.push(exe("rustdoc", compiler.host));
555 /// Get a `Command` which is ready to run `tool` in `stage` built for
557 fn tool_cmd(&self, compiler: &Compiler, tool: &str) -> Command {
558 let mut cmd = Command::new(self.tool(&compiler, tool));
559 let host = compiler.host;
560 let mut paths = vec![
561 self.cargo_out(compiler, Mode::Libstd, host).join("deps"),
562 self.cargo_out(compiler, Mode::Libtest, host).join("deps"),
563 self.cargo_out(compiler, Mode::Librustc, host).join("deps"),
564 self.cargo_out(compiler, Mode::Tool, host).join("deps"),
567 // On MSVC a tool may invoke a C compiler (e.g. compiletest in run-make
568 // mode) and that C compiler may need some extra PATH modification. Do
570 if compiler.host.contains("msvc") {
571 let curpaths = env::var_os("PATH").unwrap_or(OsString::new());
572 let curpaths = env::split_paths(&curpaths).collect::<Vec<_>>();
573 for &(ref k, ref v) in self.cc[compiler.host].0.env() {
577 for path in env::split_paths(v) {
578 if !curpaths.contains(&path) {
584 add_lib_path(paths, &mut cmd);
588 /// Get the space-separated set of activated features for the standard
590 fn std_features(&self) -> String {
591 let mut features = "panic-unwind".to_string();
592 if self.config.debug_jemalloc {
593 features.push_str(" debug-jemalloc");
595 if self.config.use_jemalloc {
596 features.push_str(" jemalloc");
598 if self.config.backtrace {
599 features.push_str(" backtrace");
604 /// Get the space-separated set of activated features for the compiler.
605 fn rustc_features(&self) -> String {
606 let mut features = String::new();
607 if self.config.use_jemalloc {
608 features.push_str(" jemalloc");
613 /// Component directory that Cargo will produce output into (e.g.
615 fn cargo_dir(&self) -> &'static str {
616 if self.config.rust_optimize {"release"} else {"debug"}
619 /// Returns the sysroot for the `compiler` specified that *this build system
622 /// That is, the sysroot for the stage0 compiler is not what the compiler
623 /// thinks it is by default, but it's the same as the default for stages
625 fn sysroot(&self, compiler: &Compiler) -> PathBuf {
626 if compiler.stage == 0 {
627 self.out.join(compiler.host).join("stage0-sysroot")
629 self.out.join(compiler.host).join(format!("stage{}", compiler.stage))
633 /// Returns the libdir where the standard library and other artifacts are
634 /// found for a compiler's sysroot.
635 fn sysroot_libdir(&self, compiler: &Compiler, target: &str) -> PathBuf {
636 self.sysroot(compiler).join("lib").join("rustlib")
637 .join(target).join("lib")
640 /// Returns the root directory for all output generated in a particular
641 /// stage when running with a particular host compiler.
643 /// The mode indicates what the root directory is for.
644 fn stage_out(&self, compiler: &Compiler, mode: Mode) -> PathBuf {
645 let suffix = match mode {
646 Mode::Libstd => "-std",
647 Mode::Libtest => "-test",
648 Mode::Tool => "-tools",
649 Mode::Librustc => "-rustc",
651 self.out.join(compiler.host)
652 .join(format!("stage{}{}", compiler.stage, suffix))
655 /// Returns the root output directory for all Cargo output in a given stage,
656 /// running a particular comipler, wehther or not we're building the
657 /// standard library, and targeting the specified architecture.
661 target: &str) -> PathBuf {
662 self.stage_out(compiler, mode).join(target).join(self.cargo_dir())
665 /// Root output directory for LLVM compiled for `target`
667 /// Note that if LLVM is configured externally then the directory returned
668 /// will likely be empty.
669 fn llvm_out(&self, target: &str) -> PathBuf {
670 self.out.join(target).join("llvm")
673 /// Output directory for all documentation for a target
674 fn doc_out(&self, target: &str) -> PathBuf {
675 self.out.join(target).join("doc")
678 /// Returns true if no custom `llvm-config` is set for the specified target.
680 /// If no custom `llvm-config` was specified then Rust's llvm will be used.
681 fn is_rust_llvm(&self, target: &str) -> bool {
682 match self.config.target_config.get(target) {
683 Some(ref c) => c.llvm_config.is_none(),
688 /// Returns the path to `llvm-config` for the specified target.
690 /// If a custom `llvm-config` was specified for target then that's returned
692 fn llvm_config(&self, target: &str) -> PathBuf {
693 let target_config = self.config.target_config.get(target);
694 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
697 self.llvm_out(&self.config.build).join("bin")
698 .join(exe("llvm-config", target))
702 /// Returns the path to `FileCheck` binary for the specified target
703 fn llvm_filecheck(&self, target: &str) -> PathBuf {
704 let target_config = self.config.target_config.get(target);
705 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
706 s.parent().unwrap().join(exe("FileCheck", target))
708 let base = self.llvm_out(&self.config.build).join("build");
709 let exe = exe("FileCheck", target);
710 if self.config.build.contains("msvc") {
711 base.join("Release/bin").join(exe)
713 base.join("bin").join(exe)
718 /// Root output directory for rust_test_helpers library compiled for
720 fn test_helpers_out(&self, target: &str) -> PathBuf {
721 self.out.join(target).join("rust-test-helpers")
724 /// Adds the compiler's directory of dynamic libraries to `cmd`'s dynamic
725 /// library lookup path.
726 fn add_rustc_lib_path(&self, compiler: &Compiler, cmd: &mut Command) {
727 // Windows doesn't need dylib path munging because the dlls for the
728 // compiler live next to the compiler and the system will find them
734 add_lib_path(vec![self.rustc_libdir(compiler)], cmd);
737 /// Adds the `RUST_TEST_THREADS` env var if necessary
738 fn add_rust_test_threads(&self, cmd: &mut Command) {
739 if env::var_os("RUST_TEST_THREADS").is_none() {
740 cmd.env("RUST_TEST_THREADS", self.jobs().to_string());
744 /// Returns the compiler's libdir where it stores the dynamic libraries that
745 /// it itself links against.
747 /// For example this returns `<sysroot>/lib` on Unix and `<sysroot>/bin` on
749 fn rustc_libdir(&self, compiler: &Compiler) -> PathBuf {
750 if compiler.is_snapshot(self) {
751 self.rustc_snapshot_libdir()
753 self.sysroot(compiler).join(libdir(compiler.host))
757 /// Returns the libdir of the snapshot compiler.
758 fn rustc_snapshot_libdir(&self) -> PathBuf {
759 self.rustc.parent().unwrap().parent().unwrap()
760 .join(libdir(&self.config.build))
763 /// Runs a command, printing out nice contextual information if it fails.
764 fn run(&self, cmd: &mut Command) {
765 self.verbose(&format!("running: {:?}", cmd));
769 /// Prints a message if this build is configured in verbose mode.
770 fn verbose(&self, msg: &str) {
771 if self.flags.verbose || self.config.verbose {
776 /// Returns the number of parallel jobs that have been configured for this
778 fn jobs(&self) -> u32 {
779 self.flags.jobs.unwrap_or(num_cpus::get() as u32)
782 /// Returns the path to the C compiler for the target specified.
783 fn cc(&self, target: &str) -> &Path {
784 self.cc[target].0.path()
787 /// Returns a list of flags to pass to the C compiler for the target
789 fn cflags(&self, target: &str) -> Vec<String> {
790 // Filter out -O and /O (the optimization flags) that we picked up from
791 // gcc-rs because the build scripts will determine that for themselves.
792 let mut base = self.cc[target].0.args().iter()
793 .map(|s| s.to_string_lossy().into_owned())
794 .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
795 .collect::<Vec<_>>();
797 // If we're compiling on OSX then we add a few unconditional flags
798 // indicating that we want libc++ (more filled out than libstdc++) and
799 // we want to compile for 10.7. This way we can ensure that
800 // LLVM/jemalloc/etc are all properly compiled.
801 if target.contains("apple-darwin") {
802 base.push("-stdlib=libc++".into());
804 // This is a hack, because newer binutils broke things on some vms/distros
805 // (i.e., linking against unknown relocs disabled by the following flag)
806 // See: https://github.com/rust-lang/rust/issues/34978
808 "i586-unknown-linux-gnu" |
809 "i686-unknown-linux-musl" |
810 "x86_64-unknown-linux-musl" => {
811 base.push("-Wa,-mrelax-relocations=no".into());
818 /// Returns the path to the `ar` archive utility for the target specified.
819 fn ar(&self, target: &str) -> Option<&Path> {
820 self.cc[target].1.as_ref().map(|p| &**p)
823 /// Returns the path to the C++ compiler for the target specified, may panic
824 /// if no C++ compiler was configured for the target.
825 fn cxx(&self, target: &str) -> &Path {
826 match self.cxx.get(target) {
828 None => panic!("\n\ntarget `{}` is not configured as a host,
829 only as a target\n\n", target),
833 /// Returns flags to pass to the compiler to generate code for `target`.
834 fn rustc_flags(&self, target: &str) -> Vec<String> {
835 // New flags should be added here with great caution!
837 // It's quite unfortunate to **require** flags to generate code for a
838 // target, so it should only be passed here if absolutely necessary!
839 // Most default configuration should be done through target specs rather
840 // than an entry here.
842 let mut base = Vec::new();
843 if target != self.config.build && !target.contains("msvc") &&
844 !target.contains("emscripten") {
845 base.push(format!("-Clinker={}", self.cc(target).display()));
850 /// Returns the "musl root" for this `target`, if defined
851 fn musl_root(&self, target: &str) -> Option<&Path> {
852 self.config.target_config.get(target)
853 .and_then(|t| t.musl_root.as_ref())
854 .or(self.config.musl_root.as_ref())
858 /// Path to the python interpreter to use
859 fn python(&self) -> &Path {
860 self.config.python.as_ref().unwrap()
864 impl<'a> Compiler<'a> {
865 /// Creates a new complier for the specified stage/host
866 fn new(stage: u32, host: &'a str) -> Compiler<'a> {
867 Compiler { stage: stage, host: host }
870 /// Returns whether this is a snapshot compiler for `build`'s configuration
871 fn is_snapshot(&self, build: &Build) -> bool {
872 self.stage == 0 && self.host == build.config.build