src/bootstrap/builder.rs

   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.
   4 //
   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.
  10
  11 use std::any::Any;
  12 use std::cell::{Cell, RefCell};
  13 use std::collections::BTreeSet;
  14 use std::collections::HashMap;
  15 use std::env;
  16 use std::fmt::Debug;
  17 use std::fs;
  18 use std::hash::Hash;
  19 use std::ops::Deref;
  20 use std::path::{Path, PathBuf};
  21 use std::process::Command;
  22 use std::time::{Duration, Instant};
  23
  24 use cache::{Cache, Interned, INTERNER};
  25 use check;
  26 use compile;
  27 use dist;
  28 use doc;
  29 use flags::Subcommand;
  30 use install;
  31 use native;
  32 use test;
  33 use tool;
  34 use util::{add_lib_path, exe, libdir};
  35 use {Build, DocTests, Mode, GitRepo};
  36
  37 pub use Compiler;
  38
  39 use petgraph::graph::NodeIndex;
  40 use petgraph::Graph;
  41
  42 pub struct Builder<'a> {
  43     pub build: &'a Build,
  44     pub top_stage: u32,
  45     pub kind: Kind,
  46     cache: Cache,
  47     stack: RefCell<Vec<Box<dyn Any>>>,
  48     time_spent_on_dependencies: Cell<Duration>,
  49     pub paths: Vec<PathBuf>,
  50     graph_nodes: RefCell<HashMap<String, NodeIndex>>,
  51     graph: RefCell<Graph<String, bool>>,
  52     parent: Cell<Option<NodeIndex>>,
  53 }
  54
  55 impl<'a> Deref for Builder<'a> {
  56     type Target = Build;
  57
  58     fn deref(&self) -> &Self::Target {
  59         self.build
  60     }
  61 }
  62
  63 pub trait Step: 'static + Clone + Debug + PartialEq + Eq + Hash {
  64     /// `PathBuf` when directories are created or to return a `Compiler` once
  65     /// it's been assembled.
  66     type Output: Clone;
  67
  68     const DEFAULT: bool = false;
  69
  70     /// Run this rule for all hosts without cross compiling.
  71     const ONLY_HOSTS: bool = false;
  72
  73     /// Primary function to execute this rule. Can call `builder.ensure(...)`
  74     /// with other steps to run those.
  75     fn run(self, builder: &Builder) -> Self::Output;
  76
  77     /// When bootstrap is passed a set of paths, this controls whether this rule
  78     /// will execute. However, it does not get called in a "default" context
  79     /// when we are not passed any paths; in that case, make_run is called
  80     /// directly.
  81     fn should_run(run: ShouldRun) -> ShouldRun;
  82
  83     /// Build up a "root" rule, either as a default rule or from a path passed
  84     /// to us.
  85     ///
  86     /// When path is `None`, we are executing in a context where no paths were
  87     /// passed. When `./x.py build` is run, for example, this rule could get
  88     /// called if it is in the correct list below with a path of `None`.
  89     fn make_run(_run: RunConfig) {
  90         // It is reasonable to not have an implementation of make_run for rules
  91         // who do not want to get called from the root context. This means that
  92         // they are likely dependencies (e.g., sysroot creation) or similar, and
  93         // as such calling them from ./x.py isn't logical.
  94         unimplemented!()
  95     }
  96 }
  97
  98 pub struct RunConfig<'a> {
  99     pub builder: &'a Builder<'a>,
 100     pub host: Interned<String>,
 101     pub target: Interned<String>,
 102     pub path: PathBuf,
 103 }
 104
 105 struct StepDescription {
 106     default: bool,
 107     only_hosts: bool,
 108     should_run: fn(ShouldRun) -> ShouldRun,
 109     make_run: fn(RunConfig),
 110     name: &'static str,
 111 }
 112
 113 #[derive(Debug, Clone, PartialOrd, Ord, PartialEq, Eq)]
 114 pub enum PathSet {
 115     Set(BTreeSet<PathBuf>),
 116     Suite(PathBuf),
 117 }
 118
 119 impl PathSet {
 120     fn empty() -> PathSet {
 121         PathSet::Set(BTreeSet::new())
 122     }
 123
 124     fn one<P: Into<PathBuf>>(path: P) -> PathSet {
 125         let mut set = BTreeSet::new();
 126         set.insert(path.into());
 127         PathSet::Set(set)
 128     }
 129
 130     fn has(&self, needle: &Path) -> bool {
 131         match self {
 132             PathSet::Set(set) => set.iter().any(|p| p.ends_with(needle)),
 133             PathSet::Suite(_) => false,
 134         }
 135     }
 136
 137     fn path(&self, builder: &Builder) -> PathBuf {
 138         match self {
 139             PathSet::Set(set) => set
 140                 .iter()
 141                 .next()
 142                 .unwrap_or(&builder.build.src)
 143                 .to_path_buf(),
 144             PathSet::Suite(path) => PathBuf::from(path),
 145         }
 146     }
 147 }
 148
 149 impl StepDescription {
 150     fn from<S: Step>() -> StepDescription {
 151         StepDescription {
 152             default: S::DEFAULT,
 153             only_hosts: S::ONLY_HOSTS,
 154             should_run: S::should_run,
 155             make_run: S::make_run,
 156             name: unsafe { ::std::intrinsics::type_name::<S>() },
 157         }
 158     }
 159
 160     fn maybe_run(&self, builder: &Builder, pathset: &PathSet) {
 161         if builder.config.exclude.iter().any(|e| pathset.has(e)) {
 162             eprintln!("Skipping {:?} because it is excluded", pathset);
 163             return;
 164         } else if !builder.config.exclude.is_empty() {
 165             eprintln!(
 166                 "{:?} not skipped for {:?} -- not in {:?}",
 167                 pathset, self.name, builder.config.exclude
 168             );
 169         }
 170         let hosts = &builder.hosts;
 171
 172         // Determine the targets participating in this rule.
 173         let targets = if self.only_hosts {
 174             if !builder.config.run_host_only {
 175                 return; // don't run anything
 176             } else {
 177                 &builder.hosts
 178             }
 179         } else {
 180             &builder.targets
 181         };
 182
 183         for host in hosts {
 184             for target in targets {
 185                 let run = RunConfig {
 186                     builder,
 187                     path: pathset.path(builder),
 188                     host: *host,
 189                     target: *target,
 190                 };
 191                 (self.make_run)(run);
 192             }
 193         }
 194     }
 195
 196     fn run(v: &[StepDescription], builder: &Builder, paths: &[PathBuf]) {
 197         let should_runs = v
 198             .iter()
 199             .map(|desc| (desc.should_run)(ShouldRun::new(builder)))
 200             .collect::<Vec<_>>();
 201
 202         // sanity checks on rules
 203         for (desc, should_run) in v.iter().zip(&should_runs) {
 204             assert!(
 205                 !should_run.paths.is_empty(),
 206                 "{:?} should have at least one pathset",
 207                 desc.name
 208             );
 209         }
 210
 211         if paths.is_empty() {
 212             for (desc, should_run) in v.iter().zip(should_runs) {
 213                 if desc.default && should_run.is_really_default {
 214                     for pathset in &should_run.paths {
 215                         desc.maybe_run(builder, pathset);
 216                     }
 217                 }
 218             }
 219         } else {
 220             for path in paths {
 221                 // strip CurDir prefix if present
 222                 let path = match path.strip_prefix(".") {
 223                     Ok(p) => p,
 224                     Err(_) => path,
 225                 };
 226
 227                 let mut attempted_run = false;
 228                 for (desc, should_run) in v.iter().zip(&should_runs) {
 229                     if let Some(suite) = should_run.is_suite_path(path) {
 230                         attempted_run = true;
 231                         desc.maybe_run(builder, suite);
 232                     } else if let Some(pathset) = should_run.pathset_for_path(path) {
 233                         attempted_run = true;
 234                         desc.maybe_run(builder, pathset);
 235                     }
 236                 }
 237
 238                 if !attempted_run {
 239                     panic!("Error: no rules matched {}.", path.display());
 240                 }
 241             }
 242         }
 243     }
 244 }
 245
 246 #[derive(Clone)]
 247 pub struct ShouldRun<'a> {
 248     pub builder: &'a Builder<'a>,
 249     // use a BTreeSet to maintain sort order
 250     paths: BTreeSet<PathSet>,
 251
 252     // If this is a default rule, this is an additional constraint placed on
 253     // its run. Generally something like compiler docs being enabled.
 254     is_really_default: bool,
 255 }
 256
 257 impl<'a> ShouldRun<'a> {
 258     fn new(builder: &'a Builder) -> ShouldRun<'a> {
 259         ShouldRun {
 260             builder,
 261             paths: BTreeSet::new(),
 262             is_really_default: true, // by default no additional conditions
 263         }
 264     }
 265
 266     pub fn default_condition(mut self, cond: bool) -> Self {
 267         self.is_really_default = cond;
 268         self
 269     }
 270
 271     // Unlike `krate` this will create just one pathset. As such, it probably shouldn't actually
 272     // ever be used, but as we transition to having all rules properly handle passing krate(...) by
 273     // actually doing something different for every crate passed.
 274     pub fn all_krates(mut self, name: &str) -> Self {
 275         let mut set = BTreeSet::new();
 276         for krate in self.builder.in_tree_crates(name) {
 277             set.insert(PathBuf::from(&krate.path));
 278         }
 279         self.paths.insert(PathSet::Set(set));
 280         self
 281     }
 282
 283     pub fn krate(mut self, name: &str) -> Self {
 284         for krate in self.builder.in_tree_crates(name) {
 285             self.paths.insert(PathSet::one(&krate.path));
 286         }
 287         self
 288     }
 289
 290     // single, non-aliased path
 291     pub fn path(self, path: &str) -> Self {
 292         self.paths(&[path])
 293     }
 294
 295     // multiple aliases for the same job
 296     pub fn paths(mut self, paths: &[&str]) -> Self {
 297         self.paths
 298             .insert(PathSet::Set(paths.iter().map(PathBuf::from).collect()));
 299         self
 300     }
 301
 302     pub fn is_suite_path(&self, path: &Path) -> Option<&PathSet> {
 303         self.paths.iter().find(|pathset| match pathset {
 304             PathSet::Suite(p) => path.starts_with(p),
 305             PathSet::Set(_) => false,
 306         })
 307     }
 308
 309     pub fn suite_path(mut self, suite: &str) -> Self {
 310         self.paths.insert(PathSet::Suite(PathBuf::from(suite)));
 311         self
 312     }
 313
 314     // allows being more explicit about why should_run in Step returns the value passed to it
 315     pub fn never(mut self) -> ShouldRun<'a> {
 316         self.paths.insert(PathSet::empty());
 317         self
 318     }
 319
 320     fn pathset_for_path(&self, path: &Path) -> Option<&PathSet> {
 321         self.paths.iter().find(|pathset| pathset.has(path))
 322     }
 323 }
 324
 325 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 326 pub enum Kind {
 327     Build,
 328     Check,
 329     Test,
 330     Bench,
 331     Dist,
 332     Doc,
 333     Install,
 334 }
 335
 336 impl<'a> Builder<'a> {
 337     fn get_step_descriptions(kind: Kind) -> Vec<StepDescription> {
 338         macro_rules! describe {
 339             ($($rule:ty),+ $(,)*) => {{
 340                 vec![$(StepDescription::from::<$rule>()),+]
 341             }};
 342         }
 343         match kind {
 344             Kind::Build => describe!(
 345                 compile::Std,
 346                 compile::Test,
 347                 compile::Rustc,
 348                 compile::CodegenBackend,
 349                 compile::StartupObjects,
 350                 tool::BuildManifest,
 351                 tool::Rustbook,
 352                 tool::ErrorIndex,
 353                 tool::UnstableBookGen,
 354                 tool::Tidy,
 355                 tool::Linkchecker,
 356                 tool::CargoTest,
 357                 tool::Compiletest,
 358                 tool::RemoteTestServer,
 359                 tool::RemoteTestClient,
 360                 tool::RustInstaller,
 361                 tool::Cargo,
 362                 tool::Rls,
 363                 tool::Rustdoc,
 364                 tool::Clippy,
 365                 native::Llvm,
 366                 tool::Rustfmt,
 367                 tool::Miri,
 368                 native::Lld
 369             ),
 370             Kind::Check => describe!(
 371                 check::Std,
 372                 check::Test,
 373                 check::Rustc,
 374                 check::CodegenBackend,
 375                 check::Rustdoc
 376             ),
 377             Kind::Test => describe!(
 378                 test::Tidy,
 379                 test::Ui,
 380                 test::RunPass,
 381                 test::CompileFail,
 382                 test::ParseFail,
 383                 test::RunFail,
 384                 test::RunPassValgrind,
 385                 test::MirOpt,
 386                 test::Codegen,
 387                 test::CodegenUnits,
 388                 test::Incremental,
 389                 test::Debuginfo,
 390                 test::UiFullDeps,
 391                 test::RunPassFullDeps,
 392                 test::RunFailFullDeps,
 393                 test::CompileFailFullDeps,
 394                 test::IncrementalFullDeps,
 395                 test::Rustdoc,
 396                 test::Pretty,
 397                 test::RunPassPretty,
 398                 test::RunFailPretty,
 399                 test::RunPassValgrindPretty,
 400                 test::RunPassFullDepsPretty,
 401                 test::RunFailFullDepsPretty,
 402                 test::Crate,
 403                 test::CrateLibrustc,
 404                 test::CrateRustdoc,
 405                 test::Linkcheck,
 406                 test::Cargotest,
 407                 test::Cargo,
 408                 test::Rls,
 409                 test::ErrorIndex,
 410                 test::Distcheck,
 411                 test::RunMakeFullDeps,
 412                 test::Nomicon,
 413                 test::Reference,
 414                 test::RustdocBook,
 415                 test::RustByExample,
 416                 test::TheBook,
 417                 test::UnstableBook,
 418                 test::RustcBook,
 419                 test::Rustfmt,
 420                 test::Miri,
 421                 test::Clippy,
 422                 test::RustdocJS,
 423                 test::RustdocTheme,
 424                 // Run bootstrap close to the end as it's unlikely to fail
 425                 test::Bootstrap,
 426                 // Run run-make last, since these won't pass without make on Windows
 427                 test::RunMake,
 428                 test::RustdocUi
 429             ),
 430             Kind::Bench => describe!(test::Crate, test::CrateLibrustc),
 431             Kind::Doc => describe!(
 432                 doc::UnstableBook,
 433                 doc::UnstableBookGen,
 434                 doc::TheBook,
 435                 doc::Standalone,
 436                 doc::Std,
 437                 doc::Test,
 438                 doc::WhitelistedRustc,
 439                 doc::Rustc,
 440                 doc::Rustdoc,
 441                 doc::ErrorIndex,
 442                 doc::Nomicon,
 443                 doc::Reference,
 444                 doc::RustdocBook,
 445                 doc::RustByExample,
 446                 doc::RustcBook,
 447                 doc::CargoBook
 448             ),
 449             Kind::Dist => describe!(
 450                 dist::Docs,
 451                 dist::RustcDocs,
 452                 dist::Mingw,
 453                 dist::Rustc,
 454                 dist::DebuggerScripts,
 455                 dist::Std,
 456                 dist::Analysis,
 457                 dist::Src,
 458                 dist::PlainSourceTarball,
 459                 dist::Cargo,
 460                 dist::Rls,
 461                 dist::Rustfmt,
 462                 dist::Clippy,
 463                 dist::LlvmTools,
 464                 dist::Lldb,
 465                 dist::Extended,
 466                 dist::HashSign
 467             ),
 468             Kind::Install => describe!(
 469                 install::Docs,
 470                 install::Std,
 471                 install::Cargo,
 472                 install::Rls,
 473                 install::Rustfmt,
 474                 install::Clippy,
 475                 install::Analysis,
 476                 install::Src,
 477                 install::Rustc
 478             ),
 479         }
 480     }
 481
 482     pub fn get_help(build: &Build, subcommand: &str) -> Option<String> {
 483         let kind = match subcommand {
 484             "build" => Kind::Build,
 485             "doc" => Kind::Doc,
 486             "test" => Kind::Test,
 487             "bench" => Kind::Bench,
 488             "dist" => Kind::Dist,
 489             "install" => Kind::Install,
 490             _ => return None,
 491         };
 492
 493         let builder = Builder {
 494             build,
 495             top_stage: build.config.stage.unwrap_or(2),
 496             kind,
 497             cache: Cache::new(),
 498             stack: RefCell::new(Vec::new()),
 499             time_spent_on_dependencies: Cell::new(Duration::new(0, 0)),
 500             paths: vec![],
 501             graph_nodes: RefCell::new(HashMap::new()),
 502             graph: RefCell::new(Graph::new()),
 503             parent: Cell::new(None),
 504         };
 505
 506         let builder = &builder;
 507         let mut should_run = ShouldRun::new(builder);
 508         for desc in Builder::get_step_descriptions(builder.kind) {
 509             should_run = (desc.should_run)(should_run);
 510         }
 511         let mut help = String::from("Available paths:\n");
 512         for pathset in should_run.paths {
 513             if let PathSet::Set(set) = pathset {
 514                 set.iter().for_each(|path| {
 515                     help.push_str(
 516                         format!("    ./x.py {} {}\n", subcommand, path.display()).as_str(),
 517                     )
 518                 })
 519             }
 520         }
 521         Some(help)
 522     }
 523
 524     pub fn new(build: &Build) -> Builder {
 525         let (kind, paths) = match build.config.cmd {
 526             Subcommand::Build { ref paths } => (Kind::Build, &paths[..]),
 527             Subcommand::Check { ref paths } => (Kind::Check, &paths[..]),
 528             Subcommand::Doc { ref paths } => (Kind::Doc, &paths[..]),
 529             Subcommand::Test { ref paths, .. } => (Kind::Test, &paths[..]),
 530             Subcommand::Bench { ref paths, .. } => (Kind::Bench, &paths[..]),
 531             Subcommand::Dist { ref paths } => (Kind::Dist, &paths[..]),
 532             Subcommand::Install { ref paths } => (Kind::Install, &paths[..]),
 533             Subcommand::Clean { .. } => panic!(),
 534         };
 535
 536         let builder = Builder {
 537             build,
 538             top_stage: build.config.stage.unwrap_or(2),
 539             kind,
 540             cache: Cache::new(),
 541             stack: RefCell::new(Vec::new()),
 542             time_spent_on_dependencies: Cell::new(Duration::new(0, 0)),
 543             paths: paths.to_owned(),
 544             graph_nodes: RefCell::new(HashMap::new()),
 545             graph: RefCell::new(Graph::new()),
 546             parent: Cell::new(None),
 547         };
 548
 549         if kind == Kind::Dist {
 550             assert!(
 551                 !builder.config.test_miri,
 552                 "Do not distribute with miri enabled.\n\
 553                 The distributed libraries would include all MIR (increasing binary size).
 554                 The distributed MIR would include validation statements."
 555             );
 556         }
 557
 558         builder
 559     }
 560
 561     pub fn execute_cli(&self) -> Graph<String, bool> {
 562         self.run_step_descriptions(&Builder::get_step_descriptions(self.kind), &self.paths);
 563         self.graph.borrow().clone()
 564     }
 565
 566     pub fn default_doc(&self, paths: Option<&[PathBuf]>) {
 567         let paths = paths.unwrap_or(&[]);
 568         self.run_step_descriptions(&Builder::get_step_descriptions(Kind::Doc), paths);
 569     }
 570
 571     fn run_step_descriptions(&self, v: &[StepDescription], paths: &[PathBuf]) {
 572         StepDescription::run(v, self, paths);
 573     }
 574
 575     /// Obtain a compiler at a given stage and for a given host. Explicitly does
 576     /// not take `Compiler` since all `Compiler` instances are meant to be
 577     /// obtained through this function, since it ensures that they are valid
 578     /// (i.e., built and assembled).
 579     pub fn compiler(&self, stage: u32, host: Interned<String>) -> Compiler {
 580         self.ensure(compile::Assemble {
 581             target_compiler: Compiler { stage, host },
 582         })
 583     }
 584
 585     pub fn sysroot(&self, compiler: Compiler) -> Interned<PathBuf> {
 586         self.ensure(compile::Sysroot { compiler })
 587     }
 588
 589     /// Returns the libdir where the standard library and other artifacts are
 590     /// found for a compiler's sysroot.
 591     pub fn sysroot_libdir(
 592         &self,
 593         compiler: Compiler,
 594         target: Interned<String>,
 595     ) -> Interned<PathBuf> {
 596         #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 597         struct Libdir {
 598             compiler: Compiler,
 599             target: Interned<String>,
 600         }
 601         impl Step for Libdir {
 602             type Output = Interned<PathBuf>;
 603
 604             fn should_run(run: ShouldRun) -> ShouldRun {
 605                 run.never()
 606             }
 607
 608             fn run(self, builder: &Builder) -> Interned<PathBuf> {
 609                 let compiler = self.compiler;
 610                 let config = &builder.build.config;
 611                 let lib = if compiler.stage >= 1 && config.libdir_relative().is_some() {
 612                     builder.build.config.libdir_relative().unwrap()
 613                 } else {
 614                     Path::new("lib")
 615                 };
 616                 let sysroot = builder
 617                     .sysroot(self.compiler)
 618                     .join(lib)
 619                     .join("rustlib")
 620                     .join(self.target)
 621                     .join("lib");
 622                 let _ = fs::remove_dir_all(&sysroot);
 623                 t!(fs::create_dir_all(&sysroot));
 624                 INTERNER.intern_path(sysroot)
 625             }
 626         }
 627         self.ensure(Libdir { compiler, target })
 628     }
 629
 630     pub fn sysroot_codegen_backends(&self, compiler: Compiler) -> PathBuf {
 631         self.sysroot_libdir(compiler, compiler.host)
 632             .with_file_name(self.config.rust_codegen_backends_dir.clone())
 633     }
 634
 635     /// Returns the compiler's libdir where it stores the dynamic libraries that
 636     /// it itself links against.
 637     ///
 638     /// For example this returns `<sysroot>/lib` on Unix and `<sysroot>/bin` on
 639     /// Windows.
 640     pub fn rustc_libdir(&self, compiler: Compiler) -> PathBuf {
 641         if compiler.is_snapshot(self) {
 642             self.rustc_snapshot_libdir()
 643         } else {
 644             self.sysroot(compiler).join(libdir(&compiler.host))
 645         }
 646     }
 647
 648     /// Adds the compiler's directory of dynamic libraries to `cmd`'s dynamic
 649     /// library lookup path.
 650     pub fn add_rustc_lib_path(&self, compiler: Compiler, cmd: &mut Command) {
 651         // Windows doesn't need dylib path munging because the dlls for the
 652         // compiler live next to the compiler and the system will find them
 653         // automatically.
 654         if cfg!(windows) {
 655             return;
 656         }
 657
 658         add_lib_path(vec![self.rustc_libdir(compiler)], cmd);
 659     }
 660
 661     /// Get a path to the compiler specified.
 662     pub fn rustc(&self, compiler: Compiler) -> PathBuf {
 663         if compiler.is_snapshot(self) {
 664             self.initial_rustc.clone()
 665         } else {
 666             self.sysroot(compiler)
 667                 .join("bin")
 668                 .join(exe("rustc", &compiler.host))
 669         }
 670     }
 671
 672     pub fn rustdoc(&self, host: Interned<String>) -> PathBuf {
 673         self.ensure(tool::Rustdoc { host })
 674     }
 675
 676     pub fn rustdoc_cmd(&self, host: Interned<String>) -> Command {
 677         let mut cmd = Command::new(&self.out.join("bootstrap/debug/rustdoc"));
 678         let compiler = self.compiler(self.top_stage, host);
 679         cmd.env("RUSTC_STAGE", compiler.stage.to_string())
 680             .env("RUSTC_SYSROOT", self.sysroot(compiler))
 681             .env(
 682                 "RUSTDOC_LIBDIR",
 683                 self.sysroot_libdir(compiler, self.config.build),
 684             )
 685             .env("CFG_RELEASE_CHANNEL", &self.config.channel)
 686             .env("RUSTDOC_REAL", self.rustdoc(host))
 687             .env("RUSTDOC_CRATE_VERSION", self.rust_version())
 688             .env("RUSTC_BOOTSTRAP", "1");
 689         if let Some(linker) = self.linker(host) {
 690             cmd.env("RUSTC_TARGET_LINKER", linker);
 691         }
 692         cmd
 693     }
 694
 695     /// Prepares an invocation of `cargo` to be run.
 696     ///
 697     /// This will create a `Command` that represents a pending execution of
 698     /// Cargo. This cargo will be configured to use `compiler` as the actual
 699     /// rustc compiler, its output will be scoped by `mode`'s output directory,
 700     /// it will pass the `--target` flag for the specified `target`, and will be
 701     /// executing the Cargo command `cmd`.
 702     pub fn cargo(
 703         &self,
 704         compiler: Compiler,
 705         mode: Mode,
 706         target: Interned<String>,
 707         cmd: &str,
 708     ) -> Command {
 709         let mut cargo = Command::new(&self.initial_cargo);
 710         let out_dir = self.stage_out(compiler, mode);
 711         cargo
 712             .env("CARGO_TARGET_DIR", out_dir)
 713             .arg(cmd);
 714
 715         if cmd != "install" {
 716             cargo.arg("--target")
 717                  .arg(target);
 718         } else {
 719             assert_eq!(target, compiler.host);
 720         }
 721
 722         // Set a flag for `check` so that certain build scripts can do less work
 723         // (e.g. not building/requiring LLVM).
 724         if cmd == "check" {
 725             cargo.env("RUST_CHECK", "1");
 726         }
 727
 728         cargo.arg("-j").arg(self.jobs().to_string());
 729         // Remove make-related flags to ensure Cargo can correctly set things up
 730         cargo.env_remove("MAKEFLAGS");
 731         cargo.env_remove("MFLAGS");
 732
 733         // FIXME: Temporary fix for https://github.com/rust-lang/cargo/issues/3005
 734         // Force cargo to output binaries with disambiguating hashes in the name
 735         let metadata = if compiler.stage == 0 {
 736             // Treat stage0 like special channel, whether it's a normal prior-
 737             // release rustc or a local rebuild with the same version, so we
 738             // never mix these libraries by accident.
 739             "bootstrap"
 740         } else {
 741             &self.config.channel
 742         };
 743         cargo.env("__CARGO_DEFAULT_LIB_METADATA", &metadata);
 744
 745         let stage;
 746         if compiler.stage == 0 && self.local_rebuild {
 747             // Assume the local-rebuild rustc already has stage1 features.
 748             stage = 1;
 749         } else {
 750             stage = compiler.stage;
 751         }
 752
 753         let mut extra_args = env::var(&format!("RUSTFLAGS_STAGE_{}", stage)).unwrap_or_default();
 754         if stage != 0 {
 755             let s = env::var("RUSTFLAGS_STAGE_NOT_0").unwrap_or_default();
 756             if !extra_args.is_empty() {
 757                 extra_args.push_str(" ");
 758             }
 759             extra_args.push_str(&s);
 760         }
 761
 762         if !extra_args.is_empty() {
 763             cargo.env(
 764                 "RUSTFLAGS",
 765                 format!(
 766                     "{} {}",
 767                     env::var("RUSTFLAGS").unwrap_or_default(),
 768                     extra_args
 769                 ),
 770             );
 771         }
 772
 773         let want_rustdoc = self.doc_tests != DocTests::No;
 774
 775         // We synthetically interpret a stage0 compiler used to build tools as a
 776         // "raw" compiler in that it's the exact snapshot we download. Normally
 777         // the stage0 build means it uses libraries build by the stage0
 778         // compiler, but for tools we just use the precompiled libraries that
 779         // we've downloaded
 780         let use_snapshot = mode == Mode::ToolBootstrap;
 781         assert!(!use_snapshot || stage == 0 || self.local_rebuild);
 782
 783         let maybe_sysroot = self.sysroot(compiler);
 784         let sysroot = if use_snapshot {
 785             self.rustc_snapshot_sysroot()
 786         } else {
 787             &maybe_sysroot
 788         };
 789         let libdir = sysroot.join(libdir(&compiler.host));
 790
 791         // Customize the compiler we're running. Specify the compiler to cargo
 792         // as our shim and then pass it some various options used to configure
 793         // how the actual compiler itself is called.
 794         //
 795         // These variables are primarily all read by
 796         // src/bootstrap/bin/{rustc.rs,rustdoc.rs}
 797         cargo
 798             .env("RUSTBUILD_NATIVE_DIR", self.native_dir(target))
 799             .env("RUSTC", self.out.join("bootstrap/debug/rustc"))
 800             .env("RUSTC_REAL", self.rustc(compiler))
 801             .env("RUSTC_STAGE", stage.to_string())
 802             .env(
 803                 "RUSTC_DEBUG_ASSERTIONS",
 804                 self.config.rust_debug_assertions.to_string(),
 805             )
 806             .env("RUSTC_SYSROOT", &sysroot)
 807             .env("RUSTC_LIBDIR", &libdir)
 808             .env("RUSTC_RPATH", self.config.rust_rpath.to_string())
 809             .env("RUSTDOC", self.out.join("bootstrap/debug/rustdoc"))
 810             .env(
 811                 "RUSTDOC_REAL",
 812                 if cmd == "doc" || (cmd == "test" && want_rustdoc) {
 813                     self.rustdoc(compiler.host)
 814                 } else {
 815                     PathBuf::from("/path/to/nowhere/rustdoc/not/required")
 816                 },
 817             )
 818             .env("TEST_MIRI", self.config.test_miri.to_string())
 819             .env("RUSTC_ERROR_METADATA_DST", self.extended_error_dir());
 820
 821         if let Some(host_linker) = self.linker(compiler.host) {
 822             cargo.env("RUSTC_HOST_LINKER", host_linker);
 823         }
 824         if let Some(target_linker) = self.linker(target) {
 825             cargo.env("RUSTC_TARGET_LINKER", target_linker);
 826         }
 827         if let Some(ref error_format) = self.config.rustc_error_format {
 828             cargo.env("RUSTC_ERROR_FORMAT", error_format);
 829         }
 830         if cmd != "build" && cmd != "check" && cmd != "rustc" && want_rustdoc {
 831             cargo.env("RUSTDOC_LIBDIR", self.sysroot_libdir(compiler, self.config.build));
 832         }
 833
 834         if mode.is_tool() {
 835             // Tools like cargo and rls don't get debuginfo by default right now, but this can be
 836             // enabled in the config.  Adding debuginfo makes them several times larger.
 837             if self.config.rust_debuginfo_tools {
 838                 cargo.env("RUSTC_DEBUGINFO", self.config.rust_debuginfo.to_string());
 839                 cargo.env(
 840                     "RUSTC_DEBUGINFO_LINES",
 841                     self.config.rust_debuginfo_lines.to_string(),
 842                 );
 843             }
 844         } else {
 845             cargo.env("RUSTC_DEBUGINFO", self.config.rust_debuginfo.to_string());
 846             cargo.env(
 847                 "RUSTC_DEBUGINFO_LINES",
 848                 self.config.rust_debuginfo_lines.to_string(),
 849             );
 850             cargo.env("RUSTC_FORCE_UNSTABLE", "1");
 851
 852             // Currently the compiler depends on crates from crates.io, and
 853             // then other crates can depend on the compiler (e.g. proc-macro
 854             // crates). Let's say, for example that rustc itself depends on the
 855             // bitflags crate. If an external crate then depends on the
 856             // bitflags crate as well, we need to make sure they don't
 857             // conflict, even if they pick the same version of bitflags. We'll
 858             // want to make sure that e.g. a plugin and rustc each get their
 859             // own copy of bitflags.
 860
 861             // Cargo ensures that this works in general through the -C metadata
 862             // flag. This flag will frob the symbols in the binary to make sure
 863             // they're different, even though the source code is the exact
 864             // same. To solve this problem for the compiler we extend Cargo's
 865             // already-passed -C metadata flag with our own. Our rustc.rs
 866             // wrapper around the actual rustc will detect -C metadata being
 867             // passed and frob it with this extra string we're passing in.
 868             cargo.env("RUSTC_METADATA_SUFFIX", "rustc");
 869         }
 870
 871         if let Some(x) = self.crt_static(target) {
 872             cargo.env("RUSTC_CRT_STATIC", x.to_string());
 873         }
 874
 875         if let Some(x) = self.crt_static(compiler.host) {
 876             cargo.env("RUSTC_HOST_CRT_STATIC", x.to_string());
 877         }
 878
 879         if let Some(map) = self.build.debuginfo_map(GitRepo::Rustc) {
 880             cargo.env("RUSTC_DEBUGINFO_MAP", map);
 881         }
 882
 883         // Enable usage of unstable features
 884         cargo.env("RUSTC_BOOTSTRAP", "1");
 885         self.add_rust_test_threads(&mut cargo);
 886
 887         // Almost all of the crates that we compile as part of the bootstrap may
 888         // have a build script, including the standard library. To compile a
 889         // build script, however, it itself needs a standard library! This
 890         // introduces a bit of a pickle when we're compiling the standard
 891         // library itself.
 892         //
 893         // To work around this we actually end up using the snapshot compiler
 894         // (stage0) for compiling build scripts of the standard library itself.
 895         // The stage0 compiler is guaranteed to have a libstd available for use.
 896         //
 897         // For other crates, however, we know that we've already got a standard
 898         // library up and running, so we can use the normal compiler to compile
 899         // build scripts in that situation.
 900         //
 901         // If LLVM support is disabled we need to use the snapshot compiler to compile
 902         // build scripts, as the new compiler doesn't support executables.
 903         if mode == Mode::Std || !self.config.llvm_enabled {
 904             cargo
 905                 .env("RUSTC_SNAPSHOT", &self.initial_rustc)
 906                 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_snapshot_libdir());
 907         } else {
 908             cargo
 909                 .env("RUSTC_SNAPSHOT", self.rustc(compiler))
 910                 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_libdir(compiler));
 911         }
 912
 913         if self.config.incremental {
 914             cargo.env("CARGO_INCREMENTAL", "1");
 915         }
 916
 917         if let Some(ref on_fail) = self.config.on_fail {
 918             cargo.env("RUSTC_ON_FAIL", on_fail);
 919         }
 920
 921         if self.config.print_step_timings {
 922             cargo.env("RUSTC_PRINT_STEP_TIMINGS", "1");
 923         }
 924
 925         if self.config.backtrace_on_ice {
 926             cargo.env("RUSTC_BACKTRACE_ON_ICE", "1");
 927         }
 928
 929         if self.config.rust_verify_llvm_ir {
 930             cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
 931         }
 932
 933         cargo.env("RUSTC_VERBOSE", self.verbosity.to_string());
 934
 935         // in std, we want to avoid denying warnings for stage 0 as that makes cfg's painful.
 936         if self.config.deny_warnings && !(mode == Mode::Std && stage == 0) {
 937             cargo.env("RUSTC_DENY_WARNINGS", "1");
 938         }
 939
 940         // Throughout the build Cargo can execute a number of build scripts
 941         // compiling C/C++ code and we need to pass compilers, archivers, flags, etc
 942         // obtained previously to those build scripts.
 943         // Build scripts use either the `cc` crate or `configure/make` so we pass
 944         // the options through environment variables that are fetched and understood by both.
 945         //
 946         // FIXME: the guard against msvc shouldn't need to be here
 947         if target.contains("msvc") {
 948             if let Some(ref cl) = self.config.llvm_clang_cl {
 949                 cargo.env("CC", cl).env("CXX", cl);
 950             }
 951         } else {
 952             let ccache = self.config.ccache.as_ref();
 953             let ccacheify = |s: &Path| {
 954                 let ccache = match ccache {
 955                     Some(ref s) => s,
 956                     None => return s.display().to_string(),
 957                 };
 958                 // FIXME: the cc-rs crate only recognizes the literal strings
 959                 // `ccache` and `sccache` when doing caching compilations, so we
 960                 // mirror that here. It should probably be fixed upstream to
 961                 // accept a new env var or otherwise work with custom ccache
 962                 // vars.
 963                 match &ccache[..] {
 964                     "ccache" | "sccache" => format!("{} {}", ccache, s.display()),
 965                     _ => s.display().to_string(),
 966                 }
 967             };
 968             let cc = ccacheify(&self.cc(target));
 969             cargo.env(format!("CC_{}", target), &cc).env("CC", &cc);
 970
 971             let cflags = self.cflags(target, GitRepo::Rustc).join(" ");
 972             cargo
 973                 .env(format!("CFLAGS_{}", target), cflags.clone())
 974                 .env("CFLAGS", cflags.clone());
 975
 976             if let Some(ar) = self.ar(target) {
 977                 let ranlib = format!("{} s", ar.display());
 978                 cargo
 979                     .env(format!("AR_{}", target), ar)
 980                     .env("AR", ar)
 981                     .env(format!("RANLIB_{}", target), ranlib.clone())
 982                     .env("RANLIB", ranlib);
 983             }
 984
 985             if let Ok(cxx) = self.cxx(target) {
 986                 let cxx = ccacheify(&cxx);
 987                 cargo
 988                     .env(format!("CXX_{}", target), &cxx)
 989                     .env("CXX", &cxx)
 990                     .env(format!("CXXFLAGS_{}", target), cflags.clone())
 991                     .env("CXXFLAGS", cflags);
 992             }
 993         }
 994
 995         if (cmd == "build" || cmd == "rustc")
 996             && mode == Mode::Std
 997             && self.config.extended
 998             && compiler.is_final_stage(self)
 999         {
1000             cargo.env("RUSTC_SAVE_ANALYSIS", "api".to_string());
1001         }
1002
1003         // For `cargo doc` invocations, make rustdoc print the Rust version into the docs
1004         cargo.env("RUSTDOC_CRATE_VERSION", self.rust_version());
1005
1006         // Environment variables *required* throughout the build
1007         //
1008         // FIXME: should update code to not require this env var
1009         cargo.env("CFG_COMPILER_HOST_TRIPLE", target);
1010
1011         // Set this for all builds to make sure doc builds also get it.
1012         cargo.env("CFG_RELEASE_CHANNEL", &self.config.channel);
1013
1014         // This one's a bit tricky. As of the time of this writing the compiler
1015         // links to the `winapi` crate on crates.io. This crate provides raw
1016         // bindings to Windows system functions, sort of like libc does for
1017         // Unix. This crate also, however, provides "import libraries" for the
1018         // MinGW targets. There's an import library per dll in the windows
1019         // distribution which is what's linked to. These custom import libraries
1020         // are used because the winapi crate can reference Windows functions not
1021         // present in the MinGW import libraries.
1022         //
1023         // For example MinGW may ship libdbghelp.a, but it may not have
1024         // references to all the functions in the dbghelp dll. Instead the
1025         // custom import library for dbghelp in the winapi crates has all this
1026         // information.
1027         //
1028         // Unfortunately for us though the import libraries are linked by
1029         // default via `-ldylib=winapi_foo`. That is, they're linked with the
1030         // `dylib` type with a `winapi_` prefix (so the winapi ones don't
1031         // conflict with the system MinGW ones). This consequently means that
1032         // the binaries we ship of things like rustc_codegen_llvm (aka the rustc_codegen_llvm
1033         // DLL) when linked against *again*, for example with procedural macros
1034         // or plugins, will trigger the propagation logic of `-ldylib`, passing
1035         // `-lwinapi_foo` to the linker again. This isn't actually available in
1036         // our distribution, however, so the link fails.
1037         //
1038         // To solve this problem we tell winapi to not use its bundled import
1039         // libraries. This means that it will link to the system MinGW import
1040         // libraries by default, and the `-ldylib=foo` directives will still get
1041         // passed to the final linker, but they'll look like `-lfoo` which can
1042         // be resolved because MinGW has the import library. The downside is we
1043         // don't get newer functions from Windows, but we don't use any of them
1044         // anyway.
1045         if !mode.is_tool() {
1046             cargo.env("WINAPI_NO_BUNDLED_LIBRARIES", "1");
1047         }
1048
1049         for _ in 1..self.verbosity {
1050             cargo.arg("-v");
1051         }
1052
1053         // This must be kept before the thinlto check, as we set codegen units
1054         // to 1 forcibly there.
1055         if let Some(n) = self.config.rust_codegen_units {
1056             cargo.env("RUSTC_CODEGEN_UNITS", n.to_string());
1057         }
1058
1059         if self.config.rust_optimize {
1060             // FIXME: cargo bench/install do not accept `--release`
1061             if cmd != "bench" && cmd != "install" {
1062                 cargo.arg("--release");
1063             }
1064         }
1065
1066         if self.config.locked_deps {
1067             cargo.arg("--locked");
1068         }
1069         if self.config.vendor || self.is_sudo {
1070             cargo.arg("--frozen");
1071         }
1072
1073         self.ci_env.force_coloring_in_ci(&mut cargo);
1074
1075         cargo
1076     }
1077
1078     /// Ensure that a given step is built, returning its output. This will
1079     /// cache the step, so it is safe (and good!) to call this as often as
1080     /// needed to ensure that all dependencies are built.
1081     pub fn ensure<S: Step>(&'a self, step: S) -> S::Output {
1082         {
1083             let mut stack = self.stack.borrow_mut();
1084             for stack_step in stack.iter() {
1085                 // should skip
1086                 if stack_step
1087                     .downcast_ref::<S>()
1088                     .map_or(true, |stack_step| *stack_step != step)
1089                 {
1090                     continue;
1091                 }
1092                 let mut out = String::new();
1093                 out += &format!("\n\nCycle in build detected when adding {:?}\n", step);
1094                 for el in stack.iter().rev() {
1095                     out += &format!("\t{:?}\n", el);
1096                 }
1097                 panic!(out);
1098             }
1099             if let Some(out) = self.cache.get(&step) {
1100                 self.verbose(&format!("{}c {:?}", "  ".repeat(stack.len()), step));
1101
1102                 {
1103                     let mut graph = self.graph.borrow_mut();
1104                     let parent = self.parent.get();
1105                     let us = *self
1106                         .graph_nodes
1107                         .borrow_mut()
1108                         .entry(format!("{:?}", step))
1109                         .or_insert_with(|| graph.add_node(format!("{:?}", step)));
1110                     if let Some(parent) = parent {
1111                         graph.add_edge(parent, us, false);
1112                     }
1113                 }
1114
1115                 return out;
1116             }
1117             self.verbose(&format!("{}> {:?}", "  ".repeat(stack.len()), step));
1118             stack.push(Box::new(step.clone()));
1119         }
1120
1121         let prev_parent = self.parent.get();
1122
1123         {
1124             let mut graph = self.graph.borrow_mut();
1125             let parent = self.parent.get();
1126             let us = *self
1127                 .graph_nodes
1128                 .borrow_mut()
1129                 .entry(format!("{:?}", step))
1130                 .or_insert_with(|| graph.add_node(format!("{:?}", step)));
1131             self.parent.set(Some(us));
1132             if let Some(parent) = parent {
1133                 graph.add_edge(parent, us, true);
1134             }
1135         }
1136
1137         let (out, dur) = {
1138             let start = Instant::now();
1139             let zero = Duration::new(0, 0);
1140             let parent = self.time_spent_on_dependencies.replace(zero);
1141             let out = step.clone().run(self);
1142             let dur = start.elapsed();
1143             let deps = self.time_spent_on_dependencies.replace(parent + dur);
1144             (out, dur - deps)
1145         };
1146
1147         self.parent.set(prev_parent);
1148
1149         if self.config.print_step_timings && dur > Duration::from_millis(100) {
1150             println!(
1151                 "[TIMING] {:?} -- {}.{:03}",
1152                 step,
1153                 dur.as_secs(),
1154                 dur.subsec_nanos() / 1_000_000
1155             );
1156         }
1157
1158         {
1159             let mut stack = self.stack.borrow_mut();
1160             let cur_step = stack.pop().expect("step stack empty");
1161             assert_eq!(cur_step.downcast_ref(), Some(&step));
1162         }
1163         self.verbose(&format!(
1164             "{}< {:?}",
1165             "  ".repeat(self.stack.borrow().len()),
1166             step
1167         ));
1168         self.cache.put(step, out.clone());
1169         out
1170     }
1171 }
1172
1173 #[cfg(test)]
1174 mod __test {
1175     use super::*;
1176     use config::Config;
1177     use std::thread;
1178
1179     fn configure(host: &[&str], target: &[&str]) -> Config {
1180         let mut config = Config::default_opts();
1181         // don't save toolstates
1182         config.save_toolstates = None;
1183         config.run_host_only = true;
1184         config.dry_run = true;
1185         // try to avoid spurious failures in dist where we create/delete each others file
1186         let dir = config.out.join("tmp-rustbuild-tests").join(
1187             &thread::current()
1188                 .name()
1189                 .unwrap_or("unknown")
1190                 .replace(":", "-"),
1191         );
1192         t!(fs::create_dir_all(&dir));
1193         config.out = dir;
1194         config.build = INTERNER.intern_str("A");
1195         config.hosts = vec![config.build]
1196             .clone()
1197             .into_iter()
1198             .chain(host.iter().map(|s| INTERNER.intern_str(s)))
1199             .collect::<Vec<_>>();
1200         config.targets = config
1201             .hosts
1202             .clone()
1203             .into_iter()
1204             .chain(target.iter().map(|s| INTERNER.intern_str(s)))
1205             .collect::<Vec<_>>();
1206         config
1207     }
1208
1209     fn first<A, B>(v: Vec<(A, B)>) -> Vec<A> {
1210         v.into_iter().map(|(a, _)| a).collect::<Vec<_>>()
1211     }
1212
1213     #[test]
1214     fn dist_baseline() {
1215         let build = Build::new(configure(&[], &[]));
1216         let mut builder = Builder::new(&build);
1217         builder.run_step_descriptions(&Builder::get_step_descriptions(Kind::Dist), &[]);
1218
1219         let a = INTERNER.intern_str("A");
1220
1221         assert_eq!(
1222             first(builder.cache.all::<dist::Docs>()),
1223             &[dist::Docs { stage: 2, host: a },]
1224         );
1225         assert_eq!(
1226             first(builder.cache.all::<dist::Mingw>()),
1227             &[dist::Mingw { host: a },]
1228         );
1229         assert_eq!(
1230             first(builder.cache.all::<dist::Rustc>()),
1231             &[dist::Rustc {
1232                 compiler: Compiler { host: a, stage: 2 }
1233             },]
1234         );
1235         assert_eq!(
1236             first(builder.cache.all::<dist::Std>()),
1237             &[dist::Std {
1238                 compiler: Compiler { host: a, stage: 2 },
1239                 target: a,
1240             },]
1241         );
1242         assert_eq!(first(builder.cache.all::<dist::Src>()), &[dist::Src]);
1243     }
1244
1245     #[test]
1246     fn dist_with_targets() {
1247         let build = Build::new(configure(&[], &["B"]));
1248         let mut builder = Builder::new(&build);
1249         builder.run_step_descriptions(&Builder::get_step_descriptions(Kind::Dist), &[]);
1250
1251         let a = INTERNER.intern_str("A");
1252         let b = INTERNER.intern_str("B");
1253
1254         assert_eq!(
1255             first(builder.cache.all::<dist::Docs>()),
1256             &[
1257                 dist::Docs { stage: 2, host: a },
1258                 dist::Docs { stage: 2, host: b },
1259             ]
1260         );
1261         assert_eq!(
1262             first(builder.cache.all::<dist::Mingw>()),
1263             &[dist::Mingw { host: a }, dist::Mingw { host: b },]
1264         );
1265         assert_eq!(
1266             first(builder.cache.all::<dist::Rustc>()),
1267             &[dist::Rustc {
1268                 compiler: Compiler { host: a, stage: 2 }
1269             },]
1270         );
1271         assert_eq!(
1272             first(builder.cache.all::<dist::Std>()),
1273             &[
1274                 dist::Std {
1275                     compiler: Compiler { host: a, stage: 2 },
1276                     target: a,
1277                 },
1278                 dist::Std {
1279                     compiler: Compiler { host: a, stage: 2 },
1280                     target: b,
1281                 },
1282             ]
1283         );
1284         assert_eq!(first(builder.cache.all::<dist::Src>()), &[dist::Src]);
1285     }
1286
1287     #[test]
1288     fn dist_with_hosts() {
1289         let build = Build::new(configure(&["B"], &[]));
1290         let mut builder = Builder::new(&build);
1291         builder.run_step_descriptions(&Builder::get_step_descriptions(Kind::Dist), &[]);
1292
1293         let a = INTERNER.intern_str("A");
1294         let b = INTERNER.intern_str("B");
1295
1296         assert_eq!(
1297             first(builder.cache.all::<dist::Docs>()),
1298             &[
1299                 dist::Docs { stage: 2, host: a },
1300                 dist::Docs { stage: 2, host: b },
1301             ]
1302         );
1303         assert_eq!(
1304             first(builder.cache.all::<dist::Mingw>()),
1305             &[dist::Mingw { host: a }, dist::Mingw { host: b },]
1306         );
1307         assert_eq!(
1308             first(builder.cache.all::<dist::Rustc>()),
1309             &[
1310                 dist::Rustc {
1311                     compiler: Compiler { host: a, stage: 2 }
1312                 },
1313                 dist::Rustc {
1314                     compiler: Compiler { host: b, stage: 2 }
1315                 },
1316             ]
1317         );
1318         assert_eq!(
1319             first(builder.cache.all::<dist::Std>()),
1320             &[
1321                 dist::Std {
1322                     compiler: Compiler { host: a, stage: 2 },
1323                     target: a,
1324                 },
1325                 dist::Std {
1326                     compiler: Compiler { host: a, stage: 2 },
1327                     target: b,
1328                 },
1329             ]
1330         );
1331         assert_eq!(first(builder.cache.all::<dist::Src>()), &[dist::Src]);
1332     }
1333
1334     #[test]
1335     fn dist_with_targets_and_hosts() {
1336         let build = Build::new(configure(&["B"], &["C"]));
1337         let mut builder = Builder::new(&build);
1338         builder.run_step_descriptions(&Builder::get_step_descriptions(Kind::Dist), &[]);
1339
1340         let a = INTERNER.intern_str("A");
1341         let b = INTERNER.intern_str("B");
1342         let c = INTERNER.intern_str("C");
1343
1344         assert_eq!(
1345             first(builder.cache.all::<dist::Docs>()),
1346             &[
1347                 dist::Docs { stage: 2, host: a },
1348                 dist::Docs { stage: 2, host: b },
1349                 dist::Docs { stage: 2, host: c },
1350             ]
1351         );
1352         assert_eq!(
1353             first(builder.cache.all::<dist::Mingw>()),
1354             &[
1355                 dist::Mingw { host: a },
1356                 dist::Mingw { host: b },
1357                 dist::Mingw { host: c },
1358             ]
1359         );
1360         assert_eq!(
1361             first(builder.cache.all::<dist::Rustc>()),
1362             &[
1363                 dist::Rustc {
1364                     compiler: Compiler { host: a, stage: 2 }
1365                 },
1366                 dist::Rustc {
1367                     compiler: Compiler { host: b, stage: 2 }
1368                 },
1369             ]
1370         );
1371         assert_eq!(
1372             first(builder.cache.all::<dist::Std>()),
1373             &[
1374                 dist::Std {
1375                     compiler: Compiler { host: a, stage: 2 },
1376                     target: a,
1377                 },
1378                 dist::Std {
1379                     compiler: Compiler { host: a, stage: 2 },
1380                     target: b,
1381                 },
1382                 dist::Std {
1383                     compiler: Compiler { host: a, stage: 2 },
1384                     target: c,
1385                 },
1386             ]
1387         );
1388         assert_eq!(first(builder.cache.all::<dist::Src>()), &[dist::Src]);
1389     }
1390
1391     #[test]
1392     fn dist_with_target_flag() {
1393         let mut config = configure(&["B"], &["C"]);
1394         config.run_host_only = false; // as-if --target=C was passed
1395         let build = Build::new(config);
1396         let mut builder = Builder::new(&build);
1397         builder.run_step_descriptions(&Builder::get_step_descriptions(Kind::Dist), &[]);
1398
1399         let a = INTERNER.intern_str("A");
1400         let b = INTERNER.intern_str("B");
1401         let c = INTERNER.intern_str("C");
1402
1403         assert_eq!(
1404             first(builder.cache.all::<dist::Docs>()),
1405             &[
1406                 dist::Docs { stage: 2, host: a },
1407                 dist::Docs { stage: 2, host: b },
1408                 dist::Docs { stage: 2, host: c },
1409             ]
1410         );
1411         assert_eq!(
1412             first(builder.cache.all::<dist::Mingw>()),
1413             &[
1414                 dist::Mingw { host: a },
1415                 dist::Mingw { host: b },
1416                 dist::Mingw { host: c },
1417             ]
1418         );
1419         assert_eq!(first(builder.cache.all::<dist::Rustc>()), &[]);
1420         assert_eq!(
1421             first(builder.cache.all::<dist::Std>()),
1422             &[
1423                 dist::Std {
1424                     compiler: Compiler { host: a, stage: 2 },
1425                     target: a,
1426                 },
1427                 dist::Std {
1428                     compiler: Compiler { host: a, stage: 2 },
1429                     target: b,
1430                 },
1431                 dist::Std {
1432                     compiler: Compiler { host: a, stage: 2 },
1433                     target: c,
1434                 },
1435             ]
1436         );
1437         assert_eq!(first(builder.cache.all::<dist::Src>()), &[]);
1438     }
1439
1440     #[test]
1441     fn dist_with_same_targets_and_hosts() {
1442         let build = Build::new(configure(&["B"], &["B"]));
1443         let mut builder = Builder::new(&build);
1444         builder.run_step_descriptions(&Builder::get_step_descriptions(Kind::Dist), &[]);
1445
1446         let a = INTERNER.intern_str("A");
1447         let b = INTERNER.intern_str("B");
1448
1449         assert_eq!(
1450             first(builder.cache.all::<dist::Docs>()),
1451             &[
1452                 dist::Docs { stage: 2, host: a },
1453                 dist::Docs { stage: 2, host: b },
1454             ]
1455         );
1456         assert_eq!(
1457             first(builder.cache.all::<dist::Mingw>()),
1458             &[dist::Mingw { host: a }, dist::Mingw { host: b },]
1459         );
1460         assert_eq!(
1461             first(builder.cache.all::<dist::Rustc>()),
1462             &[
1463                 dist::Rustc {
1464                     compiler: Compiler { host: a, stage: 2 }
1465                 },
1466                 dist::Rustc {
1467                     compiler: Compiler { host: b, stage: 2 }
1468                 },
1469             ]
1470         );
1471         assert_eq!(
1472             first(builder.cache.all::<dist::Std>()),
1473             &[
1474                 dist::Std {
1475                     compiler: Compiler { host: a, stage: 2 },
1476                     target: a,
1477                 },
1478                 dist::Std {
1479                     compiler: Compiler { host: a, stage: 2 },
1480                     target: b,
1481                 },
1482             ]
1483         );
1484         assert_eq!(first(builder.cache.all::<dist::Src>()), &[dist::Src]);
1485         assert_eq!(
1486             first(builder.cache.all::<compile::Std>()),
1487             &[
1488                 compile::Std {
1489                     compiler: Compiler { host: a, stage: 0 },
1490                     target: a,
1491                 },
1492                 compile::Std {
1493                     compiler: Compiler { host: a, stage: 1 },
1494                     target: a,
1495                 },
1496                 compile::Std {
1497                     compiler: Compiler { host: a, stage: 2 },
1498                     target: a,
1499                 },
1500                 compile::Std {
1501                     compiler: Compiler { host: a, stage: 1 },
1502                     target: b,
1503                 },
1504                 compile::Std {
1505                     compiler: Compiler { host: a, stage: 2 },
1506                     target: b,
1507                 },
1508             ]
1509         );
1510         assert_eq!(
1511             first(builder.cache.all::<compile::Test>()),
1512             &[
1513                 compile::Test {
1514                     compiler: Compiler { host: a, stage: 0 },
1515                     target: a,
1516                 },
1517                 compile::Test {
1518                     compiler: Compiler { host: a, stage: 1 },
1519                     target: a,
1520                 },
1521                 compile::Test {
1522                     compiler: Compiler { host: a, stage: 2 },
1523                     target: a,
1524                 },
1525                 compile::Test {
1526                     compiler: Compiler { host: a, stage: 1 },
1527                     target: b,
1528                 },
1529                 compile::Test {
1530                     compiler: Compiler { host: a, stage: 2 },
1531                     target: b,
1532                 },
1533             ]
1534         );
1535         assert_eq!(
1536             first(builder.cache.all::<compile::Assemble>()),
1537             &[
1538                 compile::Assemble {
1539                     target_compiler: Compiler { host: a, stage: 0 },
1540                 },
1541                 compile::Assemble {
1542                     target_compiler: Compiler { host: a, stage: 1 },
1543                 },
1544                 compile::Assemble {
1545                     target_compiler: Compiler { host: a, stage: 2 },
1546                 },
1547                 compile::Assemble {
1548                     target_compiler: Compiler { host: b, stage: 2 },
1549                 },
1550             ]
1551         );
1552     }
1553
1554     #[test]
1555     fn build_default() {
1556         let build = Build::new(configure(&["B"], &["C"]));
1557         let mut builder = Builder::new(&build);
1558         builder.run_step_descriptions(&Builder::get_step_descriptions(Kind::Build), &[]);
1559
1560         let a = INTERNER.intern_str("A");
1561         let b = INTERNER.intern_str("B");
1562         let c = INTERNER.intern_str("C");
1563
1564         assert!(!builder.cache.all::<compile::Std>().is_empty());
1565         assert!(!builder.cache.all::<compile::Assemble>().is_empty());
1566         assert_eq!(
1567             first(builder.cache.all::<compile::Rustc>()),
1568             &[
1569                 compile::Rustc {
1570                     compiler: Compiler { host: a, stage: 0 },
1571                     target: a,
1572                 },
1573                 compile::Rustc {
1574                     compiler: Compiler { host: a, stage: 1 },
1575                     target: a,
1576                 },
1577                 compile::Rustc {
1578                     compiler: Compiler { host: a, stage: 2 },
1579                     target: a,
1580                 },
1581                 compile::Rustc {
1582                     compiler: Compiler { host: b, stage: 2 },
1583                     target: a,
1584                 },
1585                 compile::Rustc {
1586                     compiler: Compiler { host: a, stage: 0 },
1587                     target: b,
1588                 },
1589                 compile::Rustc {
1590                     compiler: Compiler { host: a, stage: 1 },
1591                     target: b,
1592                 },
1593                 compile::Rustc {
1594                     compiler: Compiler { host: a, stage: 2 },
1595                     target: b,
1596                 },
1597                 compile::Rustc {
1598                     compiler: Compiler { host: b, stage: 2 },
1599                     target: b,
1600                 },
1601             ]
1602         );
1603
1604         assert_eq!(
1605             first(builder.cache.all::<compile::Test>()),
1606             &[
1607                 compile::Test {
1608                     compiler: Compiler { host: a, stage: 0 },
1609                     target: a,
1610                 },
1611                 compile::Test {
1612                     compiler: Compiler { host: a, stage: 1 },
1613                     target: a,
1614                 },
1615                 compile::Test {
1616                     compiler: Compiler { host: a, stage: 2 },
1617                     target: a,
1618                 },
1619                 compile::Test {
1620                     compiler: Compiler { host: b, stage: 2 },
1621                     target: a,
1622                 },
1623                 compile::Test {
1624                     compiler: Compiler { host: a, stage: 0 },
1625                     target: b,
1626                 },
1627                 compile::Test {
1628                     compiler: Compiler { host: a, stage: 1 },
1629                     target: b,
1630                 },
1631                 compile::Test {
1632                     compiler: Compiler { host: a, stage: 2 },
1633                     target: b,
1634                 },
1635                 compile::Test {
1636                     compiler: Compiler { host: b, stage: 2 },
1637                     target: b,
1638                 },
1639                 compile::Test {
1640                     compiler: Compiler { host: a, stage: 2 },
1641                     target: c,
1642                 },
1643                 compile::Test {
1644                     compiler: Compiler { host: b, stage: 2 },
1645                     target: c,
1646                 },
1647             ]
1648         );
1649     }
1650
1651     #[test]
1652     fn build_with_target_flag() {
1653         let mut config = configure(&["B"], &["C"]);
1654         config.run_host_only = false;
1655         let build = Build::new(config);
1656         let mut builder = Builder::new(&build);
1657         builder.run_step_descriptions(&Builder::get_step_descriptions(Kind::Build), &[]);
1658
1659         let a = INTERNER.intern_str("A");
1660         let b = INTERNER.intern_str("B");
1661         let c = INTERNER.intern_str("C");
1662
1663         assert!(!builder.cache.all::<compile::Std>().is_empty());
1664         assert_eq!(
1665             first(builder.cache.all::<compile::Assemble>()),
1666             &[
1667                 compile::Assemble {
1668                     target_compiler: Compiler { host: a, stage: 0 },
1669                 },
1670                 compile::Assemble {
1671                     target_compiler: Compiler { host: a, stage: 1 },
1672                 },
1673                 compile::Assemble {
1674                     target_compiler: Compiler { host: b, stage: 1 },
1675                 },
1676                 compile::Assemble {
1677                     target_compiler: Compiler { host: a, stage: 2 },
1678                 },
1679                 compile::Assemble {
1680                     target_compiler: Compiler { host: b, stage: 2 },
1681                 },
1682             ]
1683         );
1684         assert_eq!(
1685             first(builder.cache.all::<compile::Rustc>()),
1686             &[
1687                 compile::Rustc {
1688                     compiler: Compiler { host: a, stage: 0 },
1689                     target: a,
1690                 },
1691                 compile::Rustc {
1692                     compiler: Compiler { host: a, stage: 1 },
1693                     target: a,
1694                 },
1695                 compile::Rustc {
1696                     compiler: Compiler { host: a, stage: 0 },
1697                     target: b,
1698                 },
1699                 compile::Rustc {
1700                     compiler: Compiler { host: a, stage: 1 },
1701                     target: b,
1702                 },
1703             ]
1704         );
1705
1706         assert_eq!(
1707             first(builder.cache.all::<compile::Test>()),
1708             &[
1709                 compile::Test {
1710                     compiler: Compiler { host: a, stage: 0 },
1711                     target: a,
1712                 },
1713                 compile::Test {
1714                     compiler: Compiler { host: a, stage: 1 },
1715                     target: a,
1716                 },
1717                 compile::Test {
1718                     compiler: Compiler { host: a, stage: 2 },
1719                     target: a,
1720                 },
1721                 compile::Test {
1722                     compiler: Compiler { host: b, stage: 2 },
1723                     target: a,
1724                 },
1725                 compile::Test {
1726                     compiler: Compiler { host: a, stage: 0 },
1727                     target: b,
1728                 },
1729                 compile::Test {
1730                     compiler: Compiler { host: a, stage: 1 },
1731                     target: b,
1732                 },
1733                 compile::Test {
1734                     compiler: Compiler { host: a, stage: 2 },
1735                     target: b,
1736                 },
1737                 compile::Test {
1738                     compiler: Compiler { host: b, stage: 2 },
1739                     target: b,
1740                 },
1741                 compile::Test {
1742                     compiler: Compiler { host: a, stage: 2 },
1743                     target: c,
1744                 },
1745                 compile::Test {
1746                     compiler: Compiler { host: b, stage: 2 },
1747                     target: c,
1748                 },
1749             ]
1750         );
1751     }
1752
1753     #[test]
1754     fn test_with_no_doc_stage0() {
1755         let mut config = configure(&[], &[]);
1756         config.stage = Some(0);
1757         config.cmd = Subcommand::Test {
1758             paths: vec!["src/libstd".into()],
1759             test_args: vec![],
1760             rustc_args: vec![],
1761             fail_fast: true,
1762             doc_tests: DocTests::No,
1763             bless: false,
1764             compare_mode: None,
1765         };
1766
1767         let build = Build::new(config);
1768         let mut builder = Builder::new(&build);
1769
1770         let host = INTERNER.intern_str("A");
1771
1772         builder.run_step_descriptions(
1773             &[StepDescription::from::<test::Crate>()],
1774             &["src/libstd".into()],
1775         );
1776
1777         // Ensure we don't build any compiler artifacts.
1778         assert!(builder.cache.all::<compile::Rustc>().is_empty());
1779         assert_eq!(
1780             first(builder.cache.all::<test::Crate>()),
1781             &[test::Crate {
1782                 compiler: Compiler { host, stage: 0 },
1783                 target: host,
1784                 mode: Mode::Std,
1785                 test_kind: test::TestKind::Test,
1786                 krate: INTERNER.intern_str("std"),
1787             },]
1788         );
1789     }
1790 }