1 // Copyright 2017 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.
12 use std::cell::RefCell;
13 use std::collections::BTreeSet;
19 use std::path::{Path, PathBuf};
20 use std::process::Command;
25 use util::{exe, libdir, add_lib_path};
27 use cache::{INTERNER, Interned, Cache};
30 use flags::Subcommand;
37 pub struct Builder<'a> {
42 stack: RefCell<Vec<Box<Any>>>,
45 impl<'a> Deref for Builder<'a> {
48 fn deref(&self) -> &Self::Target {
53 pub trait Step: 'static + Clone + Debug + PartialEq + Eq + Hash {
54 /// `PathBuf` when directories are created or to return a `Compiler` once
55 /// it's been assembled.
58 const DEFAULT: bool = false;
60 /// Run this rule for all hosts without cross compiling.
61 const ONLY_HOSTS: bool = false;
63 /// Run this rule for all targets, but only with the native host.
64 const ONLY_BUILD_TARGETS: bool = false;
66 /// Only run this step with the build triple as host and target.
67 const ONLY_BUILD: bool = false;
69 /// Primary function to execute this rule. Can call `builder.ensure(...)`
70 /// with other steps to run those.
71 fn run(self, builder: &Builder) -> Self::Output;
73 /// When bootstrap is passed a set of paths, this controls whether this rule
74 /// will execute. However, it does not get called in a "default" context
75 /// when we are not passed any paths; in that case, make_run is called
77 fn should_run(run: ShouldRun) -> ShouldRun;
79 /// Build up a "root" rule, either as a default rule or from a path passed
82 /// When path is `None`, we are executing in a context where no paths were
83 /// passed. When `./x.py build` is run, for example, this rule could get
84 /// called if it is in the correct list below with a path of `None`.
85 fn make_run(_run: RunConfig) {
86 // It is reasonable to not have an implementation of make_run for rules
87 // who do not want to get called from the root context. This means that
88 // they are likely dependencies (e.g., sysroot creation) or similar, and
89 // as such calling them from ./x.py isn't logical.
94 pub struct RunConfig<'a> {
95 pub builder: &'a Builder<'a>,
96 pub host: Interned<String>,
97 pub target: Interned<String>,
101 struct StepDescription {
104 only_build_targets: bool,
106 should_run: fn(ShouldRun) -> ShouldRun,
107 make_run: fn(RunConfig),
111 #[derive(Debug, Clone, PartialOrd, Ord, PartialEq, Eq)]
113 set: BTreeSet<PathBuf>,
117 fn empty() -> PathSet {
118 PathSet { set: BTreeSet::new() }
121 fn one<P: Into<PathBuf>>(path: P) -> PathSet {
122 let mut set = BTreeSet::new();
123 set.insert(path.into());
127 fn has(&self, needle: &Path) -> bool {
128 self.set.iter().any(|p| p.ends_with(needle))
131 fn path(&self, builder: &Builder) -> PathBuf {
132 self.set.iter().next().unwrap_or(&builder.build.src).to_path_buf()
136 impl StepDescription {
137 fn from<S: Step>() -> StepDescription {
140 only_hosts: S::ONLY_HOSTS,
141 only_build_targets: S::ONLY_BUILD_TARGETS,
142 only_build: S::ONLY_BUILD,
143 should_run: S::should_run,
144 make_run: S::make_run,
145 name: unsafe { ::std::intrinsics::type_name::<S>() },
149 fn maybe_run(&self, builder: &Builder, pathset: &PathSet) {
150 if builder.config.exclude.iter().any(|e| pathset.has(e)) {
151 eprintln!("Skipping {:?} because it is excluded", pathset);
153 } else if !builder.config.exclude.is_empty() {
154 eprintln!("{:?} not skipped for {:?} -- not in {:?}", pathset,
155 self.name, builder.config.exclude);
157 let build = builder.build;
158 let hosts = if self.only_build_targets || self.only_build {
164 // Determine the targets participating in this rule.
165 let targets = if self.only_hosts {
166 if build.config.run_host_only {
168 } else if self.only_build {
178 for target in targets {
179 let run = RunConfig {
181 path: pathset.path(builder),
185 (self.make_run)(run);
190 fn run(v: &[StepDescription], builder: &Builder, paths: &[PathBuf]) {
191 let should_runs = v.iter().map(|desc| {
192 (desc.should_run)(ShouldRun::new(builder))
193 }).collect::<Vec<_>>();
195 // sanity checks on rules
196 for (desc, should_run) in v.iter().zip(&should_runs) {
197 assert!(!should_run.paths.is_empty(),
198 "{:?} should have at least one pathset", desc.name);
201 if paths.is_empty() {
202 for (desc, should_run) in v.iter().zip(should_runs) {
203 if desc.default && should_run.is_really_default {
204 for pathset in &should_run.paths {
205 desc.maybe_run(builder, pathset);
211 let mut attempted_run = false;
212 for (desc, should_run) in v.iter().zip(&should_runs) {
213 if let Some(pathset) = should_run.pathset_for_path(path) {
214 attempted_run = true;
215 desc.maybe_run(builder, pathset);
220 panic!("Error: no rules matched {}.", path.display());
228 pub struct ShouldRun<'a> {
229 pub builder: &'a Builder<'a>,
230 // use a BTreeSet to maintain sort order
231 paths: BTreeSet<PathSet>,
233 // If this is a default rule, this is an additional constraint placed on
234 // it's run. Generally something like compiler docs being enabled.
235 is_really_default: bool,
238 impl<'a> ShouldRun<'a> {
239 fn new(builder: &'a Builder) -> ShouldRun<'a> {
242 paths: BTreeSet::new(),
243 is_really_default: true, // by default no additional conditions
247 pub fn default_condition(mut self, cond: bool) -> Self {
248 self.is_really_default = cond;
252 // Unlike `krate` this will create just one pathset. As such, it probably shouldn't actually
253 // ever be used, but as we transition to having all rules properly handle passing krate(...) by
254 // actually doing something different for every crate passed.
255 pub fn all_krates(mut self, name: &str) -> Self {
256 let mut set = BTreeSet::new();
257 for krate in self.builder.in_tree_crates(name) {
258 set.insert(PathBuf::from(&krate.path));
260 self.paths.insert(PathSet { set });
264 pub fn krate(mut self, name: &str) -> Self {
265 for krate in self.builder.in_tree_crates(name) {
266 self.paths.insert(PathSet::one(&krate.path));
271 // single, non-aliased path
272 pub fn path(self, path: &str) -> Self {
276 // multiple aliases for the same job
277 pub fn paths(mut self, paths: &[&str]) -> Self {
278 self.paths.insert(PathSet {
279 set: paths.iter().map(PathBuf::from).collect(),
284 // allows being more explicit about why should_run in Step returns the value passed to it
285 pub fn never(mut self) -> ShouldRun<'a> {
286 self.paths.insert(PathSet::empty());
290 fn pathset_for_path(&self, path: &Path) -> Option<&PathSet> {
291 self.paths.iter().find(|pathset| pathset.has(path))
295 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
306 impl<'a> Builder<'a> {
307 fn get_step_descriptions(kind: Kind) -> Vec<StepDescription> {
308 macro_rules! describe {
309 ($($rule:ty),+ $(,)*) => {{
310 vec![$(StepDescription::from::<$rule>()),+]
314 Kind::Build => describe!(compile::Std, compile::Test, compile::Rustc,
315 compile::StartupObjects, tool::BuildManifest, tool::Rustbook, tool::ErrorIndex,
316 tool::UnstableBookGen, tool::Tidy, tool::Linkchecker, tool::CargoTest,
317 tool::Compiletest, tool::RemoteTestServer, tool::RemoteTestClient,
318 tool::RustInstaller, tool::Cargo, tool::Rls, tool::Rustdoc, tool::Clippy,
319 native::Llvm, tool::Rustfmt, tool::Miri),
320 Kind::Check => describe!(check::Std, check::Test, check::Rustc),
321 Kind::Test => describe!(test::Tidy, test::Bootstrap, test::Ui, test::RunPass,
322 test::CompileFail, test::ParseFail, test::RunFail, test::RunPassValgrind,
323 test::MirOpt, test::Codegen, test::CodegenUnits, test::Incremental, test::Debuginfo,
324 test::UiFullDeps, test::RunPassFullDeps, test::RunFailFullDeps,
325 test::CompileFailFullDeps, test::IncrementalFullDeps, test::Rustdoc, test::Pretty,
326 test::RunPassPretty, test::RunFailPretty, test::RunPassValgrindPretty,
327 test::RunPassFullDepsPretty, test::RunFailFullDepsPretty, test::RunMake,
328 test::Crate, test::CrateLibrustc, test::Rustdoc, test::Linkcheck, test::Cargotest,
329 test::Cargo, test::Rls, test::Docs, test::ErrorIndex, test::Distcheck,
330 test::Rustfmt, test::Miri, test::Clippy, test::RustdocJS, test::RustdocTheme),
331 Kind::Bench => describe!(test::Crate, test::CrateLibrustc),
332 Kind::Doc => describe!(doc::UnstableBook, doc::UnstableBookGen, doc::TheBook,
333 doc::Standalone, doc::Std, doc::Test, doc::Rustc, doc::ErrorIndex, doc::Nomicon,
334 doc::Reference, doc::Rustdoc, doc::RustByExample, doc::CargoBook),
335 Kind::Dist => describe!(dist::Docs, dist::Mingw, dist::Rustc, dist::DebuggerScripts,
336 dist::Std, dist::Analysis, dist::Src, dist::PlainSourceTarball, dist::Cargo,
337 dist::Rls, dist::Rustfmt, dist::Extended, dist::HashSign),
338 Kind::Install => describe!(install::Docs, install::Std, install::Cargo, install::Rls,
339 install::Rustfmt, install::Analysis, install::Src, install::Rustc),
343 pub fn get_help(build: &Build, subcommand: &str) -> Option<String> {
344 let kind = match subcommand {
345 "build" => Kind::Build,
347 "test" => Kind::Test,
348 "bench" => Kind::Bench,
349 "dist" => Kind::Dist,
350 "install" => Kind::Install,
354 let builder = Builder {
356 top_stage: build.config.stage.unwrap_or(2),
359 stack: RefCell::new(Vec::new()),
362 let builder = &builder;
363 let mut should_run = ShouldRun::new(builder);
364 for desc in Builder::get_step_descriptions(builder.kind) {
365 should_run = (desc.should_run)(should_run);
367 let mut help = String::from("Available paths:\n");
368 for pathset in should_run.paths {
369 for path in pathset.set {
370 help.push_str(format!(" ./x.py {} {}\n", subcommand, path.display()).as_str());
376 pub fn run(build: &Build) {
377 let (kind, paths) = match build.config.cmd {
378 Subcommand::Build { ref paths } => (Kind::Build, &paths[..]),
379 Subcommand::Check { ref paths } => (Kind::Check, &paths[..]),
380 Subcommand::Doc { ref paths } => (Kind::Doc, &paths[..]),
381 Subcommand::Test { ref paths, .. } => (Kind::Test, &paths[..]),
382 Subcommand::Bench { ref paths, .. } => (Kind::Bench, &paths[..]),
383 Subcommand::Dist { ref paths } => (Kind::Dist, &paths[..]),
384 Subcommand::Install { ref paths } => (Kind::Install, &paths[..]),
385 Subcommand::Clean { .. } => panic!(),
388 if paths[0] == Path::new("nonexistent/path/to/trigger/cargo/metadata") {
392 let builder = Builder {
394 top_stage: build.config.stage.unwrap_or(2),
397 stack: RefCell::new(Vec::new()),
400 if kind == Kind::Dist {
401 assert!(!build.config.test_miri, "Do not distribute with miri enabled.\n\
402 The distributed libraries would include all MIR (increasing binary size).
403 The distributed MIR would include validation statements.");
406 StepDescription::run(&Builder::get_step_descriptions(builder.kind), &builder, paths);
409 pub fn default_doc(&self, paths: Option<&[PathBuf]>) {
410 let paths = paths.unwrap_or(&[]);
411 StepDescription::run(&Builder::get_step_descriptions(Kind::Doc), self, paths);
414 /// Obtain a compiler at a given stage and for a given host. Explicitly does
415 /// not take `Compiler` since all `Compiler` instances are meant to be
416 /// obtained through this function, since it ensures that they are valid
417 /// (i.e., built and assembled).
418 pub fn compiler(&self, stage: u32, host: Interned<String>) -> Compiler {
419 self.ensure(compile::Assemble { target_compiler: Compiler { stage, host } })
422 pub fn sysroot(&self, compiler: Compiler) -> Interned<PathBuf> {
423 self.ensure(compile::Sysroot { compiler })
426 /// Returns the libdir where the standard library and other artifacts are
427 /// found for a compiler's sysroot.
428 pub fn sysroot_libdir(
429 &self, compiler: Compiler, target: Interned<String>
430 ) -> Interned<PathBuf> {
431 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
434 target: Interned<String>,
436 impl Step for Libdir {
437 type Output = Interned<PathBuf>;
439 fn should_run(run: ShouldRun) -> ShouldRun {
443 fn run(self, builder: &Builder) -> Interned<PathBuf> {
444 let compiler = self.compiler;
445 let lib = if compiler.stage >= 1 && builder.build.config.libdir.is_some() {
446 builder.build.config.libdir.clone().unwrap()
450 let sysroot = builder.sysroot(self.compiler).join(lib)
451 .join("rustlib").join(self.target).join("lib");
452 let _ = fs::remove_dir_all(&sysroot);
453 t!(fs::create_dir_all(&sysroot));
454 INTERNER.intern_path(sysroot)
457 self.ensure(Libdir { compiler, target })
460 pub fn sysroot_codegen_backends(&self, compiler: Compiler) -> PathBuf {
461 self.sysroot_libdir(compiler, compiler.host)
462 .with_file_name("codegen-backends")
465 /// Returns the compiler's libdir where it stores the dynamic libraries that
466 /// it itself links against.
468 /// For example this returns `<sysroot>/lib` on Unix and `<sysroot>/bin` on
470 pub fn rustc_libdir(&self, compiler: Compiler) -> PathBuf {
471 if compiler.is_snapshot(self) {
472 self.build.rustc_snapshot_libdir()
474 self.sysroot(compiler).join(libdir(&compiler.host))
478 /// Adds the compiler's directory of dynamic libraries to `cmd`'s dynamic
479 /// library lookup path.
480 pub fn add_rustc_lib_path(&self, compiler: Compiler, cmd: &mut Command) {
481 // Windows doesn't need dylib path munging because the dlls for the
482 // compiler live next to the compiler and the system will find them
488 add_lib_path(vec![self.rustc_libdir(compiler)], cmd);
491 /// Get a path to the compiler specified.
492 pub fn rustc(&self, compiler: Compiler) -> PathBuf {
493 if compiler.is_snapshot(self) {
494 self.initial_rustc.clone()
496 self.sysroot(compiler).join("bin").join(exe("rustc", &compiler.host))
500 pub fn rustdoc(&self, host: Interned<String>) -> PathBuf {
501 self.ensure(tool::Rustdoc { host })
504 pub fn rustdoc_cmd(&self, host: Interned<String>) -> Command {
505 let mut cmd = Command::new(&self.out.join("bootstrap/debug/rustdoc"));
506 let compiler = self.compiler(self.top_stage, host);
507 cmd.env("RUSTC_STAGE", compiler.stage.to_string())
508 .env("RUSTC_SYSROOT", self.sysroot(compiler))
509 .env("RUSTDOC_LIBDIR", self.sysroot_libdir(compiler, self.build.build))
510 .env("CFG_RELEASE_CHANNEL", &self.build.config.channel)
511 .env("RUSTDOC_REAL", self.rustdoc(host))
512 .env("RUSTDOC_CRATE_VERSION", self.build.rust_version())
513 .env("RUSTC_BOOTSTRAP", "1");
514 if let Some(linker) = self.build.linker(host) {
515 cmd.env("RUSTC_TARGET_LINKER", linker);
520 /// Prepares an invocation of `cargo` to be run.
522 /// This will create a `Command` that represents a pending execution of
523 /// Cargo. This cargo will be configured to use `compiler` as the actual
524 /// rustc compiler, its output will be scoped by `mode`'s output directory,
525 /// it will pass the `--target` flag for the specified `target`, and will be
526 /// executing the Cargo command `cmd`.
530 target: Interned<String>,
531 cmd: &str) -> Command {
532 let mut cargo = Command::new(&self.initial_cargo);
533 let out_dir = self.stage_out(compiler, mode);
534 cargo.env("CARGO_TARGET_DIR", out_dir)
539 // If we were invoked from `make` then that's already got a jobserver
540 // set up for us so no need to tell Cargo about jobs all over again.
541 if env::var_os("MAKEFLAGS").is_none() && env::var_os("MFLAGS").is_none() {
542 cargo.arg("-j").arg(self.jobs().to_string());
545 // FIXME: Temporary fix for https://github.com/rust-lang/cargo/issues/3005
546 // Force cargo to output binaries with disambiguating hashes in the name
547 cargo.env("__CARGO_DEFAULT_LIB_METADATA", &self.config.channel);
550 if compiler.stage == 0 && self.local_rebuild {
551 // Assume the local-rebuild rustc already has stage1 features.
554 stage = compiler.stage;
557 let mut extra_args = env::var(&format!("RUSTFLAGS_STAGE_{}", stage)).unwrap_or_default();
559 let s = env::var("RUSTFLAGS_STAGE_NOT_0").unwrap_or_default();
560 extra_args.push_str(" ");
561 extra_args.push_str(&s);
564 if !extra_args.is_empty() {
565 cargo.env("RUSTFLAGS",
566 format!("{} {}", env::var("RUSTFLAGS").unwrap_or_default(), extra_args));
569 // Customize the compiler we're running. Specify the compiler to cargo
570 // as our shim and then pass it some various options used to configure
571 // how the actual compiler itself is called.
573 // These variables are primarily all read by
574 // src/bootstrap/bin/{rustc.rs,rustdoc.rs}
575 cargo.env("RUSTBUILD_NATIVE_DIR", self.native_dir(target))
576 .env("RUSTC", self.out.join("bootstrap/debug/rustc"))
577 .env("RUSTC_REAL", self.rustc(compiler))
578 .env("RUSTC_STAGE", stage.to_string())
579 .env("RUSTC_DEBUG_ASSERTIONS",
580 self.config.rust_debug_assertions.to_string())
581 .env("RUSTC_SYSROOT", self.sysroot(compiler))
582 .env("RUSTC_LIBDIR", self.rustc_libdir(compiler))
583 .env("RUSTC_RPATH", self.config.rust_rpath.to_string())
584 .env("RUSTDOC", self.out.join("bootstrap/debug/rustdoc"))
585 .env("RUSTDOC_REAL", if cmd == "doc" || cmd == "test" {
586 self.rustdoc(compiler.host)
588 PathBuf::from("/path/to/nowhere/rustdoc/not/required")
590 .env("TEST_MIRI", self.config.test_miri.to_string())
591 .env("RUSTC_ERROR_METADATA_DST", self.extended_error_dir());
593 if let Some(host_linker) = self.build.linker(compiler.host) {
594 cargo.env("RUSTC_HOST_LINKER", host_linker);
596 if let Some(target_linker) = self.build.linker(target) {
597 cargo.env("RUSTC_TARGET_LINKER", target_linker);
599 if cmd != "build" && cmd != "check" {
600 cargo.env("RUSTDOC_LIBDIR", self.rustc_libdir(self.compiler(2, self.build.build)));
603 if mode != Mode::Tool {
604 // Tools don't get debuginfo right now, e.g. cargo and rls don't
605 // get compiled with debuginfo.
606 // Adding debuginfo increases their sizes by a factor of 3-4.
607 cargo.env("RUSTC_DEBUGINFO", self.config.rust_debuginfo.to_string());
608 cargo.env("RUSTC_DEBUGINFO_LINES", self.config.rust_debuginfo_lines.to_string());
609 cargo.env("RUSTC_FORCE_UNSTABLE", "1");
611 // Currently the compiler depends on crates from crates.io, and
612 // then other crates can depend on the compiler (e.g. proc-macro
613 // crates). Let's say, for example that rustc itself depends on the
614 // bitflags crate. If an external crate then depends on the
615 // bitflags crate as well, we need to make sure they don't
616 // conflict, even if they pick the same version of bitflags. We'll
617 // want to make sure that e.g. a plugin and rustc each get their
618 // own copy of bitflags.
620 // Cargo ensures that this works in general through the -C metadata
621 // flag. This flag will frob the symbols in the binary to make sure
622 // they're different, even though the source code is the exact
623 // same. To solve this problem for the compiler we extend Cargo's
624 // already-passed -C metadata flag with our own. Our rustc.rs
625 // wrapper around the actual rustc will detect -C metadata being
626 // passed and frob it with this extra string we're passing in.
627 cargo.env("RUSTC_METADATA_SUFFIX", "rustc");
630 if let Some(x) = self.crt_static(target) {
631 cargo.env("RUSTC_CRT_STATIC", x.to_string());
634 // Enable usage of unstable features
635 cargo.env("RUSTC_BOOTSTRAP", "1");
636 self.add_rust_test_threads(&mut cargo);
638 // Almost all of the crates that we compile as part of the bootstrap may
639 // have a build script, including the standard library. To compile a
640 // build script, however, it itself needs a standard library! This
641 // introduces a bit of a pickle when we're compiling the standard
644 // To work around this we actually end up using the snapshot compiler
645 // (stage0) for compiling build scripts of the standard library itself.
646 // The stage0 compiler is guaranteed to have a libstd available for use.
648 // For other crates, however, we know that we've already got a standard
649 // library up and running, so we can use the normal compiler to compile
650 // build scripts in that situation.
652 // If LLVM support is disabled we need to use the snapshot compiler to compile
653 // build scripts, as the new compiler doesn't support executables.
654 if mode == Mode::Libstd || !self.build.config.llvm_enabled {
655 cargo.env("RUSTC_SNAPSHOT", &self.initial_rustc)
656 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_snapshot_libdir());
658 cargo.env("RUSTC_SNAPSHOT", self.rustc(compiler))
659 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_libdir(compiler));
662 // Ignore incremental modes except for stage0, since we're
663 // not guaranteeing correctness across builds if the compiler
664 // is changing under your feet.`
665 if self.config.incremental && compiler.stage == 0 {
666 cargo.env("CARGO_INCREMENTAL", "1");
669 if let Some(ref on_fail) = self.config.on_fail {
670 cargo.env("RUSTC_ON_FAIL", on_fail);
673 cargo.env("RUSTC_VERBOSE", format!("{}", self.verbosity));
675 // Throughout the build Cargo can execute a number of build scripts
676 // compiling C/C++ code and we need to pass compilers, archivers, flags, etc
677 // obtained previously to those build scripts.
678 // Build scripts use either the `cc` crate or `configure/make` so we pass
679 // the options through environment variables that are fetched and understood by both.
681 // FIXME: the guard against msvc shouldn't need to be here
682 if !target.contains("msvc") {
683 let cc = self.cc(target);
684 cargo.env(format!("CC_{}", target), cc)
687 let cflags = self.cflags(target).join(" ");
688 cargo.env(format!("CFLAGS_{}", target), cflags.clone())
689 .env("CFLAGS", cflags.clone());
691 if let Some(ar) = self.ar(target) {
692 let ranlib = format!("{} s", ar.display());
693 cargo.env(format!("AR_{}", target), ar)
695 .env(format!("RANLIB_{}", target), ranlib.clone())
696 .env("RANLIB", ranlib);
699 if let Ok(cxx) = self.cxx(target) {
700 cargo.env(format!("CXX_{}", target), cxx)
702 .env(format!("CXXFLAGS_{}", target), cflags.clone())
703 .env("CXXFLAGS", cflags);
707 if mode == Mode::Libstd && self.config.extended && compiler.is_final_stage(self) {
708 cargo.env("RUSTC_SAVE_ANALYSIS", "api".to_string());
711 // For `cargo doc` invocations, make rustdoc print the Rust version into the docs
712 cargo.env("RUSTDOC_CRATE_VERSION", self.build.rust_version());
714 // Environment variables *required* throughout the build
716 // FIXME: should update code to not require this env var
717 cargo.env("CFG_COMPILER_HOST_TRIPLE", target);
719 // Set this for all builds to make sure doc builds also get it.
720 cargo.env("CFG_RELEASE_CHANNEL", &self.build.config.channel);
722 // This one's a bit tricky. As of the time of this writing the compiler
723 // links to the `winapi` crate on crates.io. This crate provides raw
724 // bindings to Windows system functions, sort of like libc does for
725 // Unix. This crate also, however, provides "import libraries" for the
726 // MinGW targets. There's an import library per dll in the windows
727 // distribution which is what's linked to. These custom import libraries
728 // are used because the winapi crate can reference Windows functions not
729 // present in the MinGW import libraries.
731 // For example MinGW may ship libdbghelp.a, but it may not have
732 // references to all the functions in the dbghelp dll. Instead the
733 // custom import library for dbghelp in the winapi crates has all this
736 // Unfortunately for us though the import libraries are linked by
737 // default via `-ldylib=winapi_foo`. That is, they're linked with the
738 // `dylib` type with a `winapi_` prefix (so the winapi ones don't
739 // conflict with the system MinGW ones). This consequently means that
740 // the binaries we ship of things like rustc_trans (aka the rustc_trans
741 // DLL) when linked against *again*, for example with procedural macros
742 // or plugins, will trigger the propagation logic of `-ldylib`, passing
743 // `-lwinapi_foo` to the linker again. This isn't actually available in
744 // our distribution, however, so the link fails.
746 // To solve this problem we tell winapi to not use its bundled import
747 // libraries. This means that it will link to the system MinGW import
748 // libraries by default, and the `-ldylib=foo` directives will still get
749 // passed to the final linker, but they'll look like `-lfoo` which can
750 // be resolved because MinGW has the import library. The downside is we
751 // don't get newer functions from Windows, but we don't use any of them
753 cargo.env("WINAPI_NO_BUNDLED_LIBRARIES", "1");
755 if self.is_very_verbose() {
759 // This must be kept before the thinlto check, as we set codegen units
760 // to 1 forcibly there.
761 if let Some(n) = self.config.rust_codegen_units {
762 cargo.env("RUSTC_CODEGEN_UNITS", n.to_string());
765 if self.config.rust_optimize {
766 // FIXME: cargo bench does not accept `--release`
768 cargo.arg("--release");
771 if self.config.rust_codegen_units.is_none() &&
772 self.build.is_rust_llvm(compiler.host) &&
773 self.config.rust_thinlto {
774 cargo.env("RUSTC_THINLTO", "1");
775 } else if self.config.rust_codegen_units.is_none() {
776 // Generally, if ThinLTO has been disabled for some reason, we
777 // want to set the codegen units to 1. However, we shouldn't do
778 // this if the option was specifically set by the user.
779 cargo.env("RUSTC_CODEGEN_UNITS", "1");
783 if self.config.locked_deps {
784 cargo.arg("--locked");
786 if self.config.vendor || self.is_sudo {
787 cargo.arg("--frozen");
790 self.ci_env.force_coloring_in_ci(&mut cargo);
795 /// Ensure that a given step is built, returning it's output. This will
796 /// cache the step, so it is safe (and good!) to call this as often as
797 /// needed to ensure that all dependencies are built.
798 pub fn ensure<S: Step>(&'a self, step: S) -> S::Output {
800 let mut stack = self.stack.borrow_mut();
801 for stack_step in stack.iter() {
803 if stack_step.downcast_ref::<S>().map_or(true, |stack_step| *stack_step != step) {
806 let mut out = String::new();
807 out += &format!("\n\nCycle in build detected when adding {:?}\n", step);
808 for el in stack.iter().rev() {
809 out += &format!("\t{:?}\n", el);
813 if let Some(out) = self.cache.get(&step) {
814 self.build.verbose(&format!("{}c {:?}", " ".repeat(stack.len()), step));
818 self.build.verbose(&format!("{}> {:?}", " ".repeat(stack.len()), step));
819 stack.push(Box::new(step.clone()));
821 let out = step.clone().run(self);
823 let mut stack = self.stack.borrow_mut();
824 let cur_step = stack.pop().expect("step stack empty");
825 assert_eq!(cur_step.downcast_ref(), Some(&step));
827 self.build.verbose(&format!("{}< {:?}", " ".repeat(self.stack.borrow().len()), step));
828 self.cache.put(step, out.clone());