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>,
98 pub path: Option<&'a Path>,
101 struct StepDescription {
104 only_build_targets: bool,
106 should_run: fn(ShouldRun) -> ShouldRun,
107 make_run: fn(RunConfig),
110 impl StepDescription {
111 fn from<S: Step>() -> StepDescription {
114 only_hosts: S::ONLY_HOSTS,
115 only_build_targets: S::ONLY_BUILD_TARGETS,
116 only_build: S::ONLY_BUILD,
117 should_run: S::should_run,
118 make_run: S::make_run,
122 fn maybe_run(&self, builder: &Builder, path: Option<&Path>) {
123 let build = builder.build;
124 let hosts = if self.only_build_targets || self.only_build {
130 // Determine the targets participating in this rule.
131 let targets = if self.only_hosts {
132 if build.config.run_host_only {
134 } else if self.only_build {
144 for target in targets {
145 let run = RunConfig {
151 (self.make_run)(run);
156 fn run(v: &[StepDescription], builder: &Builder, paths: &[PathBuf]) {
157 let should_runs = v.iter().map(|desc| {
158 (desc.should_run)(ShouldRun::new(builder))
159 }).collect::<Vec<_>>();
160 if paths.is_empty() {
161 for (desc, should_run) in v.iter().zip(should_runs) {
162 if desc.default && should_run.is_really_default {
163 desc.maybe_run(builder, None);
168 let mut attempted_run = false;
169 for (desc, should_run) in v.iter().zip(&should_runs) {
170 if should_run.run(path) {
171 attempted_run = true;
172 desc.maybe_run(builder, Some(path));
177 eprintln!("Warning: no rules matched {}.", path.display());
185 pub struct ShouldRun<'a> {
186 pub builder: &'a Builder<'a>,
187 // use a BTreeSet to maintain sort order
188 paths: BTreeSet<PathBuf>,
190 // If this is a default rule, this is an additional constraint placed on
191 // it's run. Generally something like compiler docs being enabled.
192 is_really_default: bool,
195 impl<'a> ShouldRun<'a> {
196 fn new(builder: &'a Builder) -> ShouldRun<'a> {
199 paths: BTreeSet::new(),
200 is_really_default: true, // by default no additional conditions
204 pub fn default_condition(mut self, cond: bool) -> Self {
205 self.is_really_default = cond;
209 pub fn krate(mut self, name: &str) -> Self {
210 for (_, krate_path) in self.builder.crates(name) {
211 self.paths.insert(PathBuf::from(krate_path));
216 pub fn path(mut self, path: &str) -> Self {
217 self.paths.insert(PathBuf::from(path));
221 // allows being more explicit about why should_run in Step returns the value passed to it
222 pub fn never(self) -> ShouldRun<'a> {
226 fn run(&self, path: &Path) -> bool {
227 self.paths.iter().any(|p| path.ends_with(p))
231 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
242 impl<'a> Builder<'a> {
243 fn get_step_descriptions(kind: Kind) -> Vec<StepDescription> {
244 macro_rules! describe {
245 ($($rule:ty),+ $(,)*) => {{
246 vec![$(StepDescription::from::<$rule>()),+]
250 Kind::Build => describe!(compile::Std, compile::Test, compile::Rustc,
251 compile::StartupObjects, tool::BuildManifest, tool::Rustbook, tool::ErrorIndex,
252 tool::UnstableBookGen, tool::Tidy, tool::Linkchecker, tool::CargoTest,
253 tool::Compiletest, tool::RemoteTestServer, tool::RemoteTestClient,
254 tool::RustInstaller, tool::Cargo, tool::Rls, tool::Rustdoc, tool::Clippy,
255 native::Llvm, tool::Rustfmt, tool::Miri),
256 Kind::Check => describe!(check::Std, check::Test, check::Rustc),
257 Kind::Test => describe!(test::Tidy, test::Bootstrap, test::DefaultCompiletest,
258 test::HostCompiletest, test::Crate, test::CrateLibrustc, test::Rustdoc,
259 test::Linkcheck, test::Cargotest, test::Cargo, test::Rls, test::Docs,
260 test::ErrorIndex, test::Distcheck, test::Rustfmt, test::Miri, test::Clippy,
261 test::RustdocJS, test::RustdocTheme),
262 Kind::Bench => describe!(test::Crate, test::CrateLibrustc),
263 Kind::Doc => describe!(doc::UnstableBook, doc::UnstableBookGen, doc::TheBook,
264 doc::Standalone, doc::Std, doc::Test, doc::Rustc, doc::ErrorIndex, doc::Nomicon,
265 doc::Reference, doc::Rustdoc, doc::RustByExample, doc::CargoBook),
266 Kind::Dist => describe!(dist::Docs, dist::Mingw, dist::Rustc, dist::DebuggerScripts,
267 dist::Std, dist::Analysis, dist::Src, dist::PlainSourceTarball, dist::Cargo,
268 dist::Rls, dist::Rustfmt, dist::Extended, dist::HashSign,
269 dist::DontDistWithMiriEnabled),
270 Kind::Install => describe!(install::Docs, install::Std, install::Cargo, install::Rls,
271 install::Rustfmt, install::Analysis, install::Src, install::Rustc),
275 pub fn get_help(build: &Build, subcommand: &str) -> Option<String> {
276 let kind = match subcommand {
277 "build" => Kind::Build,
279 "test" => Kind::Test,
280 "bench" => Kind::Bench,
281 "dist" => Kind::Dist,
282 "install" => Kind::Install,
286 let builder = Builder {
288 top_stage: build.config.stage.unwrap_or(2),
291 stack: RefCell::new(Vec::new()),
294 let builder = &builder;
295 let mut should_run = ShouldRun::new(builder);
296 for desc in Builder::get_step_descriptions(builder.kind) {
297 should_run = (desc.should_run)(should_run);
299 let mut help = String::from("Available paths:\n");
300 for path in should_run.paths {
301 help.push_str(format!(" ./x.py {} {}\n", subcommand, path.display()).as_str());
306 pub fn run(build: &Build) {
307 let (kind, paths) = match build.config.cmd {
308 Subcommand::Build { ref paths } => (Kind::Build, &paths[..]),
309 Subcommand::Check { ref paths } => (Kind::Check, &paths[..]),
310 Subcommand::Doc { ref paths } => (Kind::Doc, &paths[..]),
311 Subcommand::Test { ref paths, .. } => (Kind::Test, &paths[..]),
312 Subcommand::Bench { ref paths, .. } => (Kind::Bench, &paths[..]),
313 Subcommand::Dist { ref paths } => (Kind::Dist, &paths[..]),
314 Subcommand::Install { ref paths } => (Kind::Install, &paths[..]),
315 Subcommand::Clean { .. } => panic!(),
318 let builder = Builder {
320 top_stage: build.config.stage.unwrap_or(2),
323 stack: RefCell::new(Vec::new()),
326 StepDescription::run(&Builder::get_step_descriptions(builder.kind), &builder, paths);
329 pub fn default_doc(&self, paths: Option<&[PathBuf]>) {
330 let paths = paths.unwrap_or(&[]);
331 StepDescription::run(&Builder::get_step_descriptions(Kind::Doc), self, paths);
334 /// Obtain a compiler at a given stage and for a given host. Explicitly does
335 /// not take `Compiler` since all `Compiler` instances are meant to be
336 /// obtained through this function, since it ensures that they are valid
337 /// (i.e., built and assembled).
338 pub fn compiler(&self, stage: u32, host: Interned<String>) -> Compiler {
339 self.ensure(compile::Assemble { target_compiler: Compiler { stage, host } })
342 pub fn sysroot(&self, compiler: Compiler) -> Interned<PathBuf> {
343 self.ensure(compile::Sysroot { compiler })
346 /// Returns the libdir where the standard library and other artifacts are
347 /// found for a compiler's sysroot.
348 pub fn sysroot_libdir(
349 &self, compiler: Compiler, target: Interned<String>
350 ) -> Interned<PathBuf> {
351 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
354 target: Interned<String>,
356 impl Step for Libdir {
357 type Output = Interned<PathBuf>;
359 fn should_run(run: ShouldRun) -> ShouldRun {
363 fn run(self, builder: &Builder) -> Interned<PathBuf> {
364 let compiler = self.compiler;
365 let lib = if compiler.stage >= 1 && builder.build.config.libdir.is_some() {
366 builder.build.config.libdir.clone().unwrap()
370 let sysroot = builder.sysroot(self.compiler).join(lib)
371 .join("rustlib").join(self.target).join("lib");
372 let _ = fs::remove_dir_all(&sysroot);
373 t!(fs::create_dir_all(&sysroot));
374 INTERNER.intern_path(sysroot)
377 self.ensure(Libdir { compiler, target })
380 pub fn sysroot_codegen_backends(&self, compiler: Compiler) -> PathBuf {
381 self.sysroot_libdir(compiler, compiler.host)
382 .with_file_name("codegen-backends")
385 /// Returns the compiler's libdir where it stores the dynamic libraries that
386 /// it itself links against.
388 /// For example this returns `<sysroot>/lib` on Unix and `<sysroot>/bin` on
390 pub fn rustc_libdir(&self, compiler: Compiler) -> PathBuf {
391 if compiler.is_snapshot(self) {
392 self.build.rustc_snapshot_libdir()
394 self.sysroot(compiler).join(libdir(&compiler.host))
398 /// Adds the compiler's directory of dynamic libraries to `cmd`'s dynamic
399 /// library lookup path.
400 pub fn add_rustc_lib_path(&self, compiler: Compiler, cmd: &mut Command) {
401 // Windows doesn't need dylib path munging because the dlls for the
402 // compiler live next to the compiler and the system will find them
408 add_lib_path(vec![self.rustc_libdir(compiler)], cmd);
411 /// Get a path to the compiler specified.
412 pub fn rustc(&self, compiler: Compiler) -> PathBuf {
413 if compiler.is_snapshot(self) {
414 self.initial_rustc.clone()
416 self.sysroot(compiler).join("bin").join(exe("rustc", &compiler.host))
420 pub fn rustdoc(&self, host: Interned<String>) -> PathBuf {
421 self.ensure(tool::Rustdoc { host })
424 pub fn rustdoc_cmd(&self, host: Interned<String>) -> Command {
425 let mut cmd = Command::new(&self.out.join("bootstrap/debug/rustdoc"));
426 let compiler = self.compiler(self.top_stage, host);
427 cmd.env("RUSTC_STAGE", compiler.stage.to_string())
428 .env("RUSTC_SYSROOT", self.sysroot(compiler))
429 .env("RUSTDOC_LIBDIR", self.sysroot_libdir(compiler, self.build.build))
430 .env("CFG_RELEASE_CHANNEL", &self.build.config.channel)
431 .env("RUSTDOC_REAL", self.rustdoc(host))
432 .env("RUSTDOC_CRATE_VERSION", self.build.rust_version())
433 .env("RUSTC_BOOTSTRAP", "1");
434 if let Some(linker) = self.build.linker(host) {
435 cmd.env("RUSTC_TARGET_LINKER", linker);
440 /// Prepares an invocation of `cargo` to be run.
442 /// This will create a `Command` that represents a pending execution of
443 /// Cargo. This cargo will be configured to use `compiler` as the actual
444 /// rustc compiler, its output will be scoped by `mode`'s output directory,
445 /// it will pass the `--target` flag for the specified `target`, and will be
446 /// executing the Cargo command `cmd`.
450 target: Interned<String>,
451 cmd: &str) -> Command {
452 let mut cargo = Command::new(&self.initial_cargo);
453 let out_dir = self.stage_out(compiler, mode);
454 cargo.env("CARGO_TARGET_DIR", out_dir)
459 // If we were invoked from `make` then that's already got a jobserver
460 // set up for us so no need to tell Cargo about jobs all over again.
461 if env::var_os("MAKEFLAGS").is_none() && env::var_os("MFLAGS").is_none() {
462 cargo.arg("-j").arg(self.jobs().to_string());
465 // FIXME: Temporary fix for https://github.com/rust-lang/cargo/issues/3005
466 // Force cargo to output binaries with disambiguating hashes in the name
467 cargo.env("__CARGO_DEFAULT_LIB_METADATA", &self.config.channel);
470 if compiler.stage == 0 && self.local_rebuild {
471 // Assume the local-rebuild rustc already has stage1 features.
474 stage = compiler.stage;
477 let mut extra_args = env::var(&format!("RUSTFLAGS_STAGE_{}", stage)).unwrap_or_default();
479 let s = env::var("RUSTFLAGS_STAGE_NOT_0").unwrap_or_default();
480 extra_args.push_str(" ");
481 extra_args.push_str(&s);
484 if !extra_args.is_empty() {
485 cargo.env("RUSTFLAGS",
486 format!("{} {}", env::var("RUSTFLAGS").unwrap_or_default(), extra_args));
489 // Customize the compiler we're running. Specify the compiler to cargo
490 // as our shim and then pass it some various options used to configure
491 // how the actual compiler itself is called.
493 // These variables are primarily all read by
494 // src/bootstrap/bin/{rustc.rs,rustdoc.rs}
495 cargo.env("RUSTBUILD_NATIVE_DIR", self.native_dir(target))
496 .env("RUSTC", self.out.join("bootstrap/debug/rustc"))
497 .env("RUSTC_REAL", self.rustc(compiler))
498 .env("RUSTC_STAGE", stage.to_string())
499 .env("RUSTC_DEBUG_ASSERTIONS",
500 self.config.rust_debug_assertions.to_string())
501 .env("RUSTC_SYSROOT", self.sysroot(compiler))
502 .env("RUSTC_LIBDIR", self.rustc_libdir(compiler))
503 .env("RUSTC_RPATH", self.config.rust_rpath.to_string())
504 .env("RUSTDOC", self.out.join("bootstrap/debug/rustdoc"))
505 .env("RUSTDOC_REAL", if cmd == "doc" || cmd == "test" {
506 self.rustdoc(compiler.host)
508 PathBuf::from("/path/to/nowhere/rustdoc/not/required")
510 .env("TEST_MIRI", self.config.test_miri.to_string())
511 .env("RUSTC_ERROR_METADATA_DST", self.extended_error_dir());
513 if let Some(host_linker) = self.build.linker(compiler.host) {
514 cargo.env("RUSTC_HOST_LINKER", host_linker);
516 if let Some(target_linker) = self.build.linker(target) {
517 cargo.env("RUSTC_TARGET_LINKER", target_linker);
519 if cmd != "build" && cmd != "check" {
520 cargo.env("RUSTDOC_LIBDIR", self.rustc_libdir(self.compiler(2, self.build.build)));
523 if mode != Mode::Tool {
524 // Tools don't get debuginfo right now, e.g. cargo and rls don't
525 // get compiled with debuginfo.
526 // Adding debuginfo increases their sizes by a factor of 3-4.
527 cargo.env("RUSTC_DEBUGINFO", self.config.rust_debuginfo.to_string());
528 cargo.env("RUSTC_DEBUGINFO_LINES", self.config.rust_debuginfo_lines.to_string());
529 cargo.env("RUSTC_FORCE_UNSTABLE", "1");
531 // Currently the compiler depends on crates from crates.io, and
532 // then other crates can depend on the compiler (e.g. proc-macro
533 // crates). Let's say, for example that rustc itself depends on the
534 // bitflags crate. If an external crate then depends on the
535 // bitflags crate as well, we need to make sure they don't
536 // conflict, even if they pick the same version of bitflags. We'll
537 // want to make sure that e.g. a plugin and rustc each get their
538 // own copy of bitflags.
540 // Cargo ensures that this works in general through the -C metadata
541 // flag. This flag will frob the symbols in the binary to make sure
542 // they're different, even though the source code is the exact
543 // same. To solve this problem for the compiler we extend Cargo's
544 // already-passed -C metadata flag with our own. Our rustc.rs
545 // wrapper around the actual rustc will detect -C metadata being
546 // passed and frob it with this extra string we're passing in.
547 cargo.env("RUSTC_METADATA_SUFFIX", "rustc");
550 if let Some(x) = self.crt_static(target) {
551 cargo.env("RUSTC_CRT_STATIC", x.to_string());
554 // Enable usage of unstable features
555 cargo.env("RUSTC_BOOTSTRAP", "1");
556 self.add_rust_test_threads(&mut cargo);
558 // Almost all of the crates that we compile as part of the bootstrap may
559 // have a build script, including the standard library. To compile a
560 // build script, however, it itself needs a standard library! This
561 // introduces a bit of a pickle when we're compiling the standard
564 // To work around this we actually end up using the snapshot compiler
565 // (stage0) for compiling build scripts of the standard library itself.
566 // The stage0 compiler is guaranteed to have a libstd available for use.
568 // For other crates, however, we know that we've already got a standard
569 // library up and running, so we can use the normal compiler to compile
570 // build scripts in that situation.
572 // If LLVM support is disabled we need to use the snapshot compiler to compile
573 // build scripts, as the new compiler doesn't support executables.
574 if mode == Mode::Libstd || !self.build.config.llvm_enabled {
575 cargo.env("RUSTC_SNAPSHOT", &self.initial_rustc)
576 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_snapshot_libdir());
578 cargo.env("RUSTC_SNAPSHOT", self.rustc(compiler))
579 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_libdir(compiler));
582 // Ignore incremental modes except for stage0, since we're
583 // not guaranteeing correctness across builds if the compiler
584 // is changing under your feet.`
585 if self.config.incremental && compiler.stage == 0 {
586 cargo.env("CARGO_INCREMENTAL", "1");
589 if let Some(ref on_fail) = self.config.on_fail {
590 cargo.env("RUSTC_ON_FAIL", on_fail);
593 cargo.env("RUSTC_VERBOSE", format!("{}", self.verbosity));
595 // Throughout the build Cargo can execute a number of build scripts
596 // compiling C/C++ code and we need to pass compilers, archivers, flags, etc
597 // obtained previously to those build scripts.
598 // Build scripts use either the `cc` crate or `configure/make` so we pass
599 // the options through environment variables that are fetched and understood by both.
601 // FIXME: the guard against msvc shouldn't need to be here
602 if !target.contains("msvc") {
603 let ccache = self.config.ccache.as_ref();
604 let ccacheify = |s: &Path| {
605 let ccache = match ccache {
607 None => return s.display().to_string(),
609 // FIXME: the cc-rs crate only recognizes the literal strings
610 // `ccache` and `sccache` when doing caching compilations, so we
611 // mirror that here. It should probably be fixed upstream to
612 // accept a new env var or otherwise work with custom ccache
615 "ccache" | "sccache" => format!("{} {}", ccache, s.display()),
616 _ => s.display().to_string(),
619 let cc = ccacheify(&self.cc(target));
620 cargo.env(format!("CC_{}", target), &cc)
623 let cflags = self.cflags(target).join(" ");
624 cargo.env(format!("CFLAGS_{}", target), cflags.clone())
625 .env("CFLAGS", cflags.clone());
627 if let Some(ar) = self.ar(target) {
628 let ranlib = format!("{} s", ar.display());
629 cargo.env(format!("AR_{}", target), ar)
631 .env(format!("RANLIB_{}", target), ranlib.clone())
632 .env("RANLIB", ranlib);
635 if let Ok(cxx) = self.cxx(target) {
636 let cxx = ccacheify(&cxx);
637 cargo.env(format!("CXX_{}", target), &cxx)
639 .env(format!("CXXFLAGS_{}", target), cflags.clone())
640 .env("CXXFLAGS", cflags);
644 if mode == Mode::Libstd && self.config.extended && compiler.is_final_stage(self) {
645 cargo.env("RUSTC_SAVE_ANALYSIS", "api".to_string());
648 // For `cargo doc` invocations, make rustdoc print the Rust version into the docs
649 cargo.env("RUSTDOC_CRATE_VERSION", self.build.rust_version());
651 // Environment variables *required* throughout the build
653 // FIXME: should update code to not require this env var
654 cargo.env("CFG_COMPILER_HOST_TRIPLE", target);
656 // Set this for all builds to make sure doc builds also get it.
657 cargo.env("CFG_RELEASE_CHANNEL", &self.build.config.channel);
659 // This one's a bit tricky. As of the time of this writing the compiler
660 // links to the `winapi` crate on crates.io. This crate provides raw
661 // bindings to Windows system functions, sort of like libc does for
662 // Unix. This crate also, however, provides "import libraries" for the
663 // MinGW targets. There's an import library per dll in the windows
664 // distribution which is what's linked to. These custom import libraries
665 // are used because the winapi crate can reference Windows functions not
666 // present in the MinGW import libraries.
668 // For example MinGW may ship libdbghelp.a, but it may not have
669 // references to all the functions in the dbghelp dll. Instead the
670 // custom import library for dbghelp in the winapi crates has all this
673 // Unfortunately for us though the import libraries are linked by
674 // default via `-ldylib=winapi_foo`. That is, they're linked with the
675 // `dylib` type with a `winapi_` prefix (so the winapi ones don't
676 // conflict with the system MinGW ones). This consequently means that
677 // the binaries we ship of things like rustc_trans (aka the rustc_trans
678 // DLL) when linked against *again*, for example with procedural macros
679 // or plugins, will trigger the propagation logic of `-ldylib`, passing
680 // `-lwinapi_foo` to the linker again. This isn't actually available in
681 // our distribution, however, so the link fails.
683 // To solve this problem we tell winapi to not use its bundled import
684 // libraries. This means that it will link to the system MinGW import
685 // libraries by default, and the `-ldylib=foo` directives will still get
686 // passed to the final linker, but they'll look like `-lfoo` which can
687 // be resolved because MinGW has the import library. The downside is we
688 // don't get newer functions from Windows, but we don't use any of them
690 cargo.env("WINAPI_NO_BUNDLED_LIBRARIES", "1");
692 if self.is_very_verbose() {
696 // This must be kept before the thinlto check, as we set codegen units
697 // to 1 forcibly there.
698 if let Some(n) = self.config.rust_codegen_units {
699 cargo.env("RUSTC_CODEGEN_UNITS", n.to_string());
702 if self.config.rust_optimize {
703 // FIXME: cargo bench does not accept `--release`
705 cargo.arg("--release");
708 if self.config.rust_codegen_units.is_none() &&
709 self.build.is_rust_llvm(compiler.host) &&
710 self.config.rust_thinlto {
711 cargo.env("RUSTC_THINLTO", "1");
712 } else if self.config.rust_codegen_units.is_none() {
713 // Generally, if ThinLTO has been disabled for some reason, we
714 // want to set the codegen units to 1. However, we shouldn't do
715 // this if the option was specifically set by the user.
716 cargo.env("RUSTC_CODEGEN_UNITS", "1");
720 if self.config.locked_deps {
721 cargo.arg("--locked");
723 if self.config.vendor || self.is_sudo {
724 cargo.arg("--frozen");
727 self.ci_env.force_coloring_in_ci(&mut cargo);
732 /// Ensure that a given step is built, returning it's output. This will
733 /// cache the step, so it is safe (and good!) to call this as often as
734 /// needed to ensure that all dependencies are built.
735 pub fn ensure<S: Step>(&'a self, step: S) -> S::Output {
737 let mut stack = self.stack.borrow_mut();
738 for stack_step in stack.iter() {
740 if stack_step.downcast_ref::<S>().map_or(true, |stack_step| *stack_step != step) {
743 let mut out = String::new();
744 out += &format!("\n\nCycle in build detected when adding {:?}\n", step);
745 for el in stack.iter().rev() {
746 out += &format!("\t{:?}\n", el);
750 if let Some(out) = self.cache.get(&step) {
751 self.build.verbose(&format!("{}c {:?}", " ".repeat(stack.len()), step));
755 self.build.verbose(&format!("{}> {:?}", " ".repeat(stack.len()), step));
756 stack.push(Box::new(step.clone()));
758 let out = step.clone().run(self);
760 let mut stack = self.stack.borrow_mut();
761 let cur_step = stack.pop().expect("step stack empty");
762 assert_eq!(cur_step.downcast_ref(), Some(&step));
764 self.build.verbose(&format!("{}< {:?}", " ".repeat(self.stack.borrow().len()), step));
765 self.cache.put(step, out.clone());