src/bootstrap/compile.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   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 //! Implementation of compiling various phases of the compiler and standard
  12 //! library.
  13 //!
  14 //! This module contains some of the real meat in the rustbuild build system
  15 //! which is where Cargo is used to compiler the standard library, libtest, and
  16 //! compiler. This module is also responsible for assembling the sysroot as it
  17 //! goes along from the output of the previous stage.
  18
  19 use std::env;
  20 use std::fs::{self, File};
  21 use std::io::BufReader;
  22 use std::io::prelude::*;
  23 use std::path::{Path, PathBuf};
  24 use std::process::{Command, Stdio};
  25 use std::str;
  26 use std::cmp::min;
  27
  28 use build_helper::{output, mtime, up_to_date};
  29 use filetime::FileTime;
  30 use serde_json;
  31
  32 use util::{exe, libdir, is_dylib, copy, read_stamp_file, CiEnv};
  33 use {Build, Compiler, Mode};
  34 use native;
  35 use tool;
  36
  37 use cache::{INTERNER, Interned};
  38 use builder::{Step, RunConfig, ShouldRun, Builder};
  39
  40 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
  41 pub struct Std {
  42     pub target: Interned<String>,
  43     pub compiler: Compiler,
  44 }
  45
  46 impl Step for Std {
  47     type Output = ();
  48     const DEFAULT: bool = true;
  49
  50     fn should_run(run: ShouldRun) -> ShouldRun {
  51         run.path("src/libstd").krate("std")
  52     }
  53
  54     fn make_run(run: RunConfig) {
  55         run.builder.ensure(Std {
  56             compiler: run.builder.compiler(run.builder.top_stage, run.host),
  57             target: run.target,
  58         });
  59     }
  60
  61     /// Build the standard library.
  62     ///
  63     /// This will build the standard library for a particular stage of the build
  64     /// using the `compiler` targeting the `target` architecture. The artifacts
  65     /// created will also be linked into the sysroot directory.
  66     fn run(self, builder: &Builder) {
  67         let build = builder.build;
  68         let target = self.target;
  69         let compiler = self.compiler;
  70
  71         builder.ensure(StartupObjects { compiler, target });
  72
  73         if build.force_use_stage1(compiler, target) {
  74             let from = builder.compiler(1, build.build);
  75             builder.ensure(Std {
  76                 compiler: from,
  77                 target,
  78             });
  79             println!("Uplifting stage1 std ({} -> {})", from.host, target);
  80
  81             // Even if we're not building std this stage, the new sysroot must
  82             // still contain the musl startup objects.
  83             if target.contains("musl") && !target.contains("mips") {
  84                 let libdir = builder.sysroot_libdir(compiler, target);
  85                 copy_musl_third_party_objects(build, target, &libdir);
  86             }
  87
  88             builder.ensure(StdLink {
  89                 compiler: from,
  90                 target_compiler: compiler,
  91                 target,
  92             });
  93             return;
  94         }
  95
  96         let _folder = build.fold_output(|| format!("stage{}-std", compiler.stage));
  97         println!("Building stage{} std artifacts ({} -> {})", compiler.stage,
  98                 &compiler.host, target);
  99
 100         if target.contains("musl") && !target.contains("mips") {
 101             let libdir = builder.sysroot_libdir(compiler, target);
 102             copy_musl_third_party_objects(build, target, &libdir);
 103         }
 104
 105         let out_dir = build.stage_out(compiler, Mode::Libstd);
 106         build.clear_if_dirty(&out_dir, &builder.rustc(compiler));
 107         let mut cargo = builder.cargo(compiler, Mode::Libstd, target, "build");
 108         std_cargo(build, &compiler, target, &mut cargo);
 109         run_cargo(build,
 110                   &mut cargo,
 111                   &libstd_stamp(build, compiler, target));
 112
 113         builder.ensure(StdLink {
 114             compiler: builder.compiler(compiler.stage, build.build),
 115             target_compiler: compiler,
 116             target,
 117         });
 118     }
 119 }
 120
 121 /// Copies the crt(1,i,n).o startup objects
 122 ///
 123 /// Since musl supports fully static linking, we can cross link for it even
 124 /// with a glibc-targeting toolchain, given we have the appropriate startup
 125 /// files. As those shipped with glibc won't work, copy the ones provided by
 126 /// musl so we have them on linux-gnu hosts.
 127 fn copy_musl_third_party_objects(build: &Build,
 128                                  target: Interned<String>,
 129                                  into: &Path) {
 130     for &obj in &["crt1.o", "crti.o", "crtn.o"] {
 131         copy(&build.musl_root(target).unwrap().join("lib").join(obj), &into.join(obj));
 132     }
 133 }
 134
 135 /// Configure cargo to compile the standard library, adding appropriate env vars
 136 /// and such.
 137 pub fn std_cargo(build: &Build,
 138                  compiler: &Compiler,
 139                  target: Interned<String>,
 140                  cargo: &mut Command) {
 141     let mut features = build.std_features();
 142
 143     if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
 144         cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
 145     }
 146
 147     // When doing a local rebuild we tell cargo that we're stage1 rather than
 148     // stage0. This works fine if the local rust and being-built rust have the
 149     // same view of what the default allocator is, but fails otherwise. Since
 150     // we don't have a way to express an allocator preference yet, work
 151     // around the issue in the case of a local rebuild with jemalloc disabled.
 152     if compiler.stage == 0 && build.local_rebuild && !build.config.use_jemalloc {
 153         features.push_str(" force_alloc_system");
 154     }
 155
 156     if compiler.stage != 0 && build.config.sanitizers {
 157         // This variable is used by the sanitizer runtime crates, e.g.
 158         // rustc_lsan, to build the sanitizer runtime from C code
 159         // When this variable is missing, those crates won't compile the C code,
 160         // so we don't set this variable during stage0 where llvm-config is
 161         // missing
 162         // We also only build the runtimes when --enable-sanitizers (or its
 163         // config.toml equivalent) is used
 164         cargo.env("LLVM_CONFIG", build.llvm_config(target));
 165     }
 166
 167     cargo.arg("--features").arg(features)
 168         .arg("--manifest-path")
 169         .arg(build.src.join("src/libstd/Cargo.toml"));
 170
 171     if let Some(target) = build.config.target_config.get(&target) {
 172         if let Some(ref jemalloc) = target.jemalloc {
 173             cargo.env("JEMALLOC_OVERRIDE", jemalloc);
 174         }
 175     }
 176     if target.contains("musl") {
 177         if let Some(p) = build.musl_root(target) {
 178             cargo.env("MUSL_ROOT", p);
 179         }
 180     }
 181 }
 182
 183 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 184 struct StdLink {
 185     pub compiler: Compiler,
 186     pub target_compiler: Compiler,
 187     pub target: Interned<String>,
 188 }
 189
 190 impl Step for StdLink {
 191     type Output = ();
 192
 193     fn should_run(run: ShouldRun) -> ShouldRun {
 194         run.never()
 195     }
 196
 197     /// Link all libstd rlibs/dylibs into the sysroot location.
 198     ///
 199     /// Links those artifacts generated by `compiler` to a the `stage` compiler's
 200     /// sysroot for the specified `host` and `target`.
 201     ///
 202     /// Note that this assumes that `compiler` has already generated the libstd
 203     /// libraries for `target`, and this method will find them in the relevant
 204     /// output directory.
 205     fn run(self, builder: &Builder) {
 206         let build = builder.build;
 207         let compiler = self.compiler;
 208         let target_compiler = self.target_compiler;
 209         let target = self.target;
 210         println!("Copying stage{} std from stage{} ({} -> {} / {})",
 211                 target_compiler.stage,
 212                 compiler.stage,
 213                 &compiler.host,
 214                 target_compiler.host,
 215                 target);
 216         let libdir = builder.sysroot_libdir(target_compiler, target);
 217         add_to_sysroot(&libdir, &libstd_stamp(build, compiler, target));
 218
 219         if build.config.sanitizers && compiler.stage != 0 && target == "x86_64-apple-darwin" {
 220             // The sanitizers are only built in stage1 or above, so the dylibs will
 221             // be missing in stage0 and causes panic. See the `std()` function above
 222             // for reason why the sanitizers are not built in stage0.
 223             copy_apple_sanitizer_dylibs(&build.native_dir(target), "osx", &libdir);
 224         }
 225
 226         builder.ensure(tool::CleanTools {
 227             compiler: target_compiler,
 228             target,
 229             mode: Mode::Libstd,
 230         });
 231     }
 232 }
 233
 234 fn copy_apple_sanitizer_dylibs(native_dir: &Path, platform: &str, into: &Path) {
 235     for &sanitizer in &["asan", "tsan"] {
 236         let filename = format!("libclang_rt.{}_{}_dynamic.dylib", sanitizer, platform);
 237         let mut src_path = native_dir.join(sanitizer);
 238         src_path.push("build");
 239         src_path.push("lib");
 240         src_path.push("darwin");
 241         src_path.push(&filename);
 242         copy(&src_path, &into.join(filename));
 243     }
 244 }
 245
 246 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 247 pub struct StartupObjects {
 248     pub compiler: Compiler,
 249     pub target: Interned<String>,
 250 }
 251
 252 impl Step for StartupObjects {
 253     type Output = ();
 254
 255     fn should_run(run: ShouldRun) -> ShouldRun {
 256         run.path("src/rtstartup")
 257     }
 258
 259     fn make_run(run: RunConfig) {
 260         run.builder.ensure(StartupObjects {
 261             compiler: run.builder.compiler(run.builder.top_stage, run.host),
 262             target: run.target,
 263         });
 264     }
 265
 266     /// Build and prepare startup objects like rsbegin.o and rsend.o
 267     ///
 268     /// These are primarily used on Windows right now for linking executables/dlls.
 269     /// They don't require any library support as they're just plain old object
 270     /// files, so we just use the nightly snapshot compiler to always build them (as
 271     /// no other compilers are guaranteed to be available).
 272     fn run(self, builder: &Builder) {
 273         let build = builder.build;
 274         let for_compiler = self.compiler;
 275         let target = self.target;
 276         if !target.contains("pc-windows-gnu") {
 277             return
 278         }
 279
 280         let src_dir = &build.src.join("src/rtstartup");
 281         let dst_dir = &build.native_dir(target).join("rtstartup");
 282         let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
 283         t!(fs::create_dir_all(dst_dir));
 284
 285         for file in &["rsbegin", "rsend"] {
 286             let src_file = &src_dir.join(file.to_string() + ".rs");
 287             let dst_file = &dst_dir.join(file.to_string() + ".o");
 288             if !up_to_date(src_file, dst_file) {
 289                 let mut cmd = Command::new(&build.initial_rustc);
 290                 build.run(cmd.env("RUSTC_BOOTSTRAP", "1")
 291                             .arg("--cfg").arg("stage0")
 292                             .arg("--target").arg(target)
 293                             .arg("--emit=obj")
 294                             .arg("-o").arg(dst_file)
 295                             .arg(src_file));
 296             }
 297
 298             copy(dst_file, &sysroot_dir.join(file.to_string() + ".o"));
 299         }
 300
 301         for obj in ["crt2.o", "dllcrt2.o"].iter() {
 302             copy(&compiler_file(build.cc(target), obj), &sysroot_dir.join(obj));
 303         }
 304     }
 305 }
 306
 307 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 308 pub struct Test {
 309     pub compiler: Compiler,
 310     pub target: Interned<String>,
 311 }
 312
 313 impl Step for Test {
 314     type Output = ();
 315     const DEFAULT: bool = true;
 316
 317     fn should_run(run: ShouldRun) -> ShouldRun {
 318         run.path("src/libtest").krate("test")
 319     }
 320
 321     fn make_run(run: RunConfig) {
 322         run.builder.ensure(Test {
 323             compiler: run.builder.compiler(run.builder.top_stage, run.host),
 324             target: run.target,
 325         });
 326     }
 327
 328     /// Build libtest.
 329     ///
 330     /// This will build libtest and supporting libraries for a particular stage of
 331     /// the build using the `compiler` targeting the `target` architecture. The
 332     /// artifacts created will also be linked into the sysroot directory.
 333     fn run(self, builder: &Builder) {
 334         let build = builder.build;
 335         let target = self.target;
 336         let compiler = self.compiler;
 337
 338         builder.ensure(Std { compiler, target });
 339
 340         if build.force_use_stage1(compiler, target) {
 341             builder.ensure(Test {
 342                 compiler: builder.compiler(1, build.build),
 343                 target,
 344             });
 345             println!("Uplifting stage1 test ({} -> {})", &build.build, target);
 346             builder.ensure(TestLink {
 347                 compiler: builder.compiler(1, build.build),
 348                 target_compiler: compiler,
 349                 target,
 350             });
 351             return;
 352         }
 353
 354         let _folder = build.fold_output(|| format!("stage{}-test", compiler.stage));
 355         println!("Building stage{} test artifacts ({} -> {})", compiler.stage,
 356                 &compiler.host, target);
 357         let out_dir = build.stage_out(compiler, Mode::Libtest);
 358         build.clear_if_dirty(&out_dir, &libstd_stamp(build, compiler, target));
 359         let mut cargo = builder.cargo(compiler, Mode::Libtest, target, "build");
 360         test_cargo(build, &compiler, target, &mut cargo);
 361         run_cargo(build,
 362                   &mut cargo,
 363                   &libtest_stamp(build, compiler, target));
 364
 365         builder.ensure(TestLink {
 366             compiler: builder.compiler(compiler.stage, build.build),
 367             target_compiler: compiler,
 368             target,
 369         });
 370     }
 371 }
 372
 373 /// Same as `std_cargo`, but for libtest
 374 pub fn test_cargo(build: &Build,
 375                   _compiler: &Compiler,
 376                   _target: Interned<String>,
 377                   cargo: &mut Command) {
 378     if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
 379         cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
 380     }
 381     cargo.arg("--manifest-path")
 382         .arg(build.src.join("src/libtest/Cargo.toml"));
 383 }
 384
 385 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 386 pub struct TestLink {
 387     pub compiler: Compiler,
 388     pub target_compiler: Compiler,
 389     pub target: Interned<String>,
 390 }
 391
 392 impl Step for TestLink {
 393     type Output = ();
 394
 395     fn should_run(run: ShouldRun) -> ShouldRun {
 396         run.never()
 397     }
 398
 399     /// Same as `std_link`, only for libtest
 400     fn run(self, builder: &Builder) {
 401         let build = builder.build;
 402         let compiler = self.compiler;
 403         let target_compiler = self.target_compiler;
 404         let target = self.target;
 405         println!("Copying stage{} test from stage{} ({} -> {} / {})",
 406                 target_compiler.stage,
 407                 compiler.stage,
 408                 &compiler.host,
 409                 target_compiler.host,
 410                 target);
 411         add_to_sysroot(&builder.sysroot_libdir(target_compiler, target),
 412                     &libtest_stamp(build, compiler, target));
 413         builder.ensure(tool::CleanTools {
 414             compiler: target_compiler,
 415             target,
 416             mode: Mode::Libtest,
 417         });
 418     }
 419 }
 420
 421 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 422 pub struct Rustc {
 423     pub compiler: Compiler,
 424     pub target: Interned<String>,
 425 }
 426
 427 impl Step for Rustc {
 428     type Output = ();
 429     const ONLY_HOSTS: bool = true;
 430     const DEFAULT: bool = true;
 431
 432     fn should_run(run: ShouldRun) -> ShouldRun {
 433         run.path("src/librustc").krate("rustc-main")
 434     }
 435
 436     fn make_run(run: RunConfig) {
 437         run.builder.ensure(Rustc {
 438             compiler: run.builder.compiler(run.builder.top_stage, run.host),
 439             target: run.target,
 440         });
 441     }
 442
 443     /// Build the compiler.
 444     ///
 445     /// This will build the compiler for a particular stage of the build using
 446     /// the `compiler` targeting the `target` architecture. The artifacts
 447     /// created will also be linked into the sysroot directory.
 448     fn run(self, builder: &Builder) {
 449         let build = builder.build;
 450         let compiler = self.compiler;
 451         let target = self.target;
 452
 453         builder.ensure(Test { compiler, target });
 454
 455         // Build LLVM for our target. This will implicitly build the host LLVM
 456         // if necessary.
 457         builder.ensure(native::Llvm { target });
 458
 459         if build.force_use_stage1(compiler, target) {
 460             builder.ensure(Rustc {
 461                 compiler: builder.compiler(1, build.build),
 462                 target,
 463             });
 464             println!("Uplifting stage1 rustc ({} -> {})", &build.build, target);
 465             builder.ensure(RustcLink {
 466                 compiler: builder.compiler(1, build.build),
 467                 target_compiler: compiler,
 468                 target,
 469             });
 470             return;
 471         }
 472
 473         // Ensure that build scripts have a std to link against.
 474         builder.ensure(Std {
 475             compiler: builder.compiler(self.compiler.stage, build.build),
 476             target: build.build,
 477         });
 478
 479         let _folder = build.fold_output(|| format!("stage{}-rustc", compiler.stage));
 480         println!("Building stage{} compiler artifacts ({} -> {})",
 481                  compiler.stage, &compiler.host, target);
 482
 483         let stage_out = builder.stage_out(compiler, Mode::Librustc);
 484         build.clear_if_dirty(&stage_out, &libstd_stamp(build, compiler, target));
 485         build.clear_if_dirty(&stage_out, &libtest_stamp(build, compiler, target));
 486
 487         let mut cargo = builder.cargo(compiler, Mode::Librustc, target, "build");
 488         rustc_cargo(build, &compiler, target, &mut cargo);
 489         run_cargo(build,
 490                   &mut cargo,
 491                   &librustc_stamp(build, compiler, target));
 492
 493         builder.ensure(RustcLink {
 494             compiler: builder.compiler(compiler.stage, build.build),
 495             target_compiler: compiler,
 496             target,
 497         });
 498     }
 499 }
 500
 501 /// Same as `std_cargo`, but for libtest
 502 pub fn rustc_cargo(build: &Build,
 503                    compiler: &Compiler,
 504                    target: Interned<String>,
 505                    cargo: &mut Command) {
 506     cargo.arg("--features").arg(build.rustc_features())
 507          .arg("--manifest-path")
 508          .arg(build.src.join("src/rustc/Cargo.toml"));
 509
 510     // Set some configuration variables picked up by build scripts and
 511     // the compiler alike
 512     cargo.env("CFG_RELEASE", build.rust_release())
 513          .env("CFG_RELEASE_CHANNEL", &build.config.channel)
 514          .env("CFG_VERSION", build.rust_version())
 515          .env("CFG_PREFIX", build.config.prefix.clone().unwrap_or_default());
 516
 517     if compiler.stage == 0 {
 518         cargo.env("CFG_LIBDIR_RELATIVE", "lib");
 519     } else {
 520         let libdir_relative =
 521             build.config.libdir_relative.clone().unwrap_or(PathBuf::from("lib"));
 522         cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
 523     }
 524
 525     // If we're not building a compiler with debugging information then remove
 526     // these two env vars which would be set otherwise.
 527     if build.config.rust_debuginfo_only_std {
 528         cargo.env_remove("RUSTC_DEBUGINFO");
 529         cargo.env_remove("RUSTC_DEBUGINFO_LINES");
 530     }
 531
 532     if let Some(ref ver_date) = build.rust_info.commit_date() {
 533         cargo.env("CFG_VER_DATE", ver_date);
 534     }
 535     if let Some(ref ver_hash) = build.rust_info.sha() {
 536         cargo.env("CFG_VER_HASH", ver_hash);
 537     }
 538     if !build.unstable_features() {
 539         cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
 540     }
 541     // Flag that rust llvm is in use
 542     if build.is_rust_llvm(target) {
 543         cargo.env("LLVM_RUSTLLVM", "1");
 544     }
 545     cargo.env("LLVM_CONFIG", build.llvm_config(target));
 546     let target_config = build.config.target_config.get(&target);
 547     if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
 548         cargo.env("CFG_LLVM_ROOT", s);
 549     }
 550     // Building with a static libstdc++ is only supported on linux right now,
 551     // not for MSVC or macOS
 552     if build.config.llvm_static_stdcpp &&
 553        !target.contains("windows") &&
 554        !target.contains("apple") {
 555         cargo.env("LLVM_STATIC_STDCPP",
 556                   compiler_file(build.cxx(target).unwrap(), "libstdc++.a"));
 557     }
 558     if build.config.llvm_link_shared {
 559         cargo.env("LLVM_LINK_SHARED", "1");
 560     }
 561     if let Some(ref s) = build.config.rustc_default_linker {
 562         cargo.env("CFG_DEFAULT_LINKER", s);
 563     }
 564 }
 565
 566 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 567 struct RustcLink {
 568     pub compiler: Compiler,
 569     pub target_compiler: Compiler,
 570     pub target: Interned<String>,
 571 }
 572
 573 impl Step for RustcLink {
 574     type Output = ();
 575
 576     fn should_run(run: ShouldRun) -> ShouldRun {
 577         run.never()
 578     }
 579
 580     /// Same as `std_link`, only for librustc
 581     fn run(self, builder: &Builder) {
 582         let build = builder.build;
 583         let compiler = self.compiler;
 584         let target_compiler = self.target_compiler;
 585         let target = self.target;
 586         println!("Copying stage{} rustc from stage{} ({} -> {} / {})",
 587                  target_compiler.stage,
 588                  compiler.stage,
 589                  &compiler.host,
 590                  target_compiler.host,
 591                  target);
 592         add_to_sysroot(&builder.sysroot_libdir(target_compiler, target),
 593                        &librustc_stamp(build, compiler, target));
 594         builder.ensure(tool::CleanTools {
 595             compiler: target_compiler,
 596             target,
 597             mode: Mode::Librustc,
 598         });
 599     }
 600 }
 601
 602 /// Cargo's output path for the standard library in a given stage, compiled
 603 /// by a particular compiler for the specified target.
 604 pub fn libstd_stamp(build: &Build, compiler: Compiler, target: Interned<String>) -> PathBuf {
 605     build.cargo_out(compiler, Mode::Libstd, target).join(".libstd.stamp")
 606 }
 607
 608 /// Cargo's output path for libtest in a given stage, compiled by a particular
 609 /// compiler for the specified target.
 610 pub fn libtest_stamp(build: &Build, compiler: Compiler, target: Interned<String>) -> PathBuf {
 611     build.cargo_out(compiler, Mode::Libtest, target).join(".libtest.stamp")
 612 }
 613
 614 /// Cargo's output path for librustc in a given stage, compiled by a particular
 615 /// compiler for the specified target.
 616 pub fn librustc_stamp(build: &Build, compiler: Compiler, target: Interned<String>) -> PathBuf {
 617     build.cargo_out(compiler, Mode::Librustc, target).join(".librustc.stamp")
 618 }
 619
 620 fn compiler_file(compiler: &Path, file: &str) -> PathBuf {
 621     let out = output(Command::new(compiler)
 622                             .arg(format!("-print-file-name={}", file)));
 623     PathBuf::from(out.trim())
 624 }
 625
 626 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 627 pub struct Sysroot {
 628     pub compiler: Compiler,
 629 }
 630
 631 impl Step for Sysroot {
 632     type Output = Interned<PathBuf>;
 633
 634     fn should_run(run: ShouldRun) -> ShouldRun {
 635         run.never()
 636     }
 637
 638     /// Returns the sysroot for the `compiler` specified that *this build system
 639     /// generates*.
 640     ///
 641     /// That is, the sysroot for the stage0 compiler is not what the compiler
 642     /// thinks it is by default, but it's the same as the default for stages
 643     /// 1-3.
 644     fn run(self, builder: &Builder) -> Interned<PathBuf> {
 645         let build = builder.build;
 646         let compiler = self.compiler;
 647         let sysroot = if compiler.stage == 0 {
 648             build.out.join(&compiler.host).join("stage0-sysroot")
 649         } else {
 650             build.out.join(&compiler.host).join(format!("stage{}", compiler.stage))
 651         };
 652         let _ = fs::remove_dir_all(&sysroot);
 653         t!(fs::create_dir_all(&sysroot));
 654         INTERNER.intern_path(sysroot)
 655     }
 656 }
 657
 658 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 659 pub struct Assemble {
 660     /// The compiler which we will produce in this step. Assemble itself will
 661     /// take care of ensuring that the necessary prerequisites to do so exist,
 662     /// that is, this target can be a stage2 compiler and Assemble will build
 663     /// previous stages for you.
 664     pub target_compiler: Compiler,
 665 }
 666
 667 impl Step for Assemble {
 668     type Output = Compiler;
 669
 670     fn should_run(run: ShouldRun) -> ShouldRun {
 671         run.path("src/rustc")
 672     }
 673
 674     /// Prepare a new compiler from the artifacts in `stage`
 675     ///
 676     /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
 677     /// must have been previously produced by the `stage - 1` build.build
 678     /// compiler.
 679     fn run(self, builder: &Builder) -> Compiler {
 680         let build = builder.build;
 681         let target_compiler = self.target_compiler;
 682
 683         if target_compiler.stage == 0 {
 684             assert_eq!(build.build, target_compiler.host,
 685                 "Cannot obtain compiler for non-native build triple at stage 0");
 686             // The stage 0 compiler for the build triple is always pre-built.
 687             return target_compiler;
 688         }
 689
 690         // Get the compiler that we'll use to bootstrap ourselves.
 691         let build_compiler = if target_compiler.host != build.build {
 692             // Build a compiler for the host platform. We cannot use the stage0
 693             // compiler for the host platform for this because it doesn't have
 694             // the libraries we need.  FIXME: Perhaps we should download those
 695             // libraries? It would make builds faster...
 696             // FIXME: It may be faster if we build just a stage 1
 697             // compiler and then use that to bootstrap this compiler
 698             // forward.
 699             builder.compiler(target_compiler.stage - 1, build.build)
 700         } else {
 701             // Build the compiler we'll use to build the stage requested. This
 702             // may build more than one compiler (going down to stage 0).
 703             builder.compiler(target_compiler.stage - 1, target_compiler.host)
 704         };
 705
 706         // Build the libraries for this compiler to link to (i.e., the libraries
 707         // it uses at runtime). NOTE: Crates the target compiler compiles don't
 708         // link to these. (FIXME: Is that correct? It seems to be correct most
 709         // of the time but I think we do link to these for stage2/bin compilers
 710         // when not performing a full bootstrap).
 711         if builder.build.config.keep_stage.map_or(false, |s| target_compiler.stage <= s) {
 712             builder.verbose("skipping compilation of compiler due to --keep-stage");
 713             let compiler = build_compiler;
 714             for stage in 0..min(target_compiler.stage, builder.config.keep_stage.unwrap()) {
 715                 let target_compiler = builder.compiler(stage, target_compiler.host);
 716                 let target = target_compiler.host;
 717                 builder.ensure(StdLink { compiler, target_compiler, target });
 718                 builder.ensure(TestLink { compiler, target_compiler, target });
 719                 builder.ensure(RustcLink { compiler, target_compiler, target });
 720             }
 721         } else {
 722             builder.ensure(Rustc { compiler: build_compiler, target: target_compiler.host });
 723         }
 724
 725         let stage = target_compiler.stage;
 726         let host = target_compiler.host;
 727         println!("Assembling stage{} compiler ({})", stage, host);
 728
 729         // Link in all dylibs to the libdir
 730         let sysroot = builder.sysroot(target_compiler);
 731         let sysroot_libdir = sysroot.join(libdir(&*host));
 732         t!(fs::create_dir_all(&sysroot_libdir));
 733         let src_libdir = builder.sysroot_libdir(build_compiler, host);
 734         for f in t!(fs::read_dir(&src_libdir)).map(|f| t!(f)) {
 735             let filename = f.file_name().into_string().unwrap();
 736             if is_dylib(&filename) {
 737                 copy(&f.path(), &sysroot_libdir.join(&filename));
 738             }
 739         }
 740
 741         let out_dir = build.cargo_out(build_compiler, Mode::Librustc, host);
 742
 743         // Link the compiler binary itself into place
 744         let rustc = out_dir.join(exe("rustc", &*host));
 745         let bindir = sysroot.join("bin");
 746         t!(fs::create_dir_all(&bindir));
 747         let compiler = builder.rustc(target_compiler);
 748         let _ = fs::remove_file(&compiler);
 749         copy(&rustc, &compiler);
 750
 751         target_compiler
 752     }
 753 }
 754
 755 /// Link some files into a rustc sysroot.
 756 ///
 757 /// For a particular stage this will link the file listed in `stamp` into the
 758 /// `sysroot_dst` provided.
 759 fn add_to_sysroot(sysroot_dst: &Path, stamp: &Path) {
 760     t!(fs::create_dir_all(&sysroot_dst));
 761     for path in read_stamp_file(stamp) {
 762         copy(&path, &sysroot_dst.join(path.file_name().unwrap()));
 763     }
 764 }
 765
 766 // Avoiding a dependency on winapi to keep compile times down
 767 #[cfg(unix)]
 768 fn stderr_isatty() -> bool {
 769     use libc;
 770     unsafe { libc::isatty(libc::STDERR_FILENO) != 0 }
 771 }
 772 #[cfg(windows)]
 773 fn stderr_isatty() -> bool {
 774     type DWORD = u32;
 775     type BOOL = i32;
 776     type HANDLE = *mut u8;
 777     const STD_ERROR_HANDLE: DWORD = -12i32 as DWORD;
 778     extern "system" {
 779         fn GetStdHandle(which: DWORD) -> HANDLE;
 780         fn GetConsoleMode(hConsoleHandle: HANDLE, lpMode: *mut DWORD) -> BOOL;
 781     }
 782     unsafe {
 783         let handle = GetStdHandle(STD_ERROR_HANDLE);
 784         let mut out = 0;
 785         GetConsoleMode(handle, &mut out) != 0
 786     }
 787 }
 788
 789 fn run_cargo(build: &Build, cargo: &mut Command, stamp: &Path) {
 790     // Instruct Cargo to give us json messages on stdout, critically leaving
 791     // stderr as piped so we can get those pretty colors.
 792     cargo.arg("--message-format").arg("json")
 793          .stdout(Stdio::piped());
 794
 795     if stderr_isatty() && build.ci_env == CiEnv::None {
 796         // since we pass message-format=json to cargo, we need to tell the rustc
 797         // wrapper to give us colored output if necessary. This is because we
 798         // only want Cargo's JSON output, not rustcs.
 799         cargo.env("RUSTC_COLOR", "1");
 800     }
 801
 802     build.verbose(&format!("running: {:?}", cargo));
 803     let mut child = match cargo.spawn() {
 804         Ok(child) => child,
 805         Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
 806     };
 807
 808     // `target_root_dir` looks like $dir/$target/release
 809     let target_root_dir = stamp.parent().unwrap();
 810     // `target_deps_dir` looks like $dir/$target/release/deps
 811     let target_deps_dir = target_root_dir.join("deps");
 812     // `host_root_dir` looks like $dir/release
 813     let host_root_dir = target_root_dir.parent().unwrap() // chop off `release`
 814                                        .parent().unwrap() // chop off `$target`
 815                                        .join(target_root_dir.file_name().unwrap());
 816
 817     // Spawn Cargo slurping up its JSON output. We'll start building up the
 818     // `deps` array of all files it generated along with a `toplevel` array of
 819     // files we need to probe for later.
 820     let mut deps = Vec::new();
 821     let mut toplevel = Vec::new();
 822     let stdout = BufReader::new(child.stdout.take().unwrap());
 823     for line in stdout.lines() {
 824         let line = t!(line);
 825         let json: serde_json::Value = if line.starts_with("{") {
 826             t!(serde_json::from_str(&line))
 827         } else {
 828             // If this was informational, just print it out and continue
 829             println!("{}", line);
 830             continue
 831         };
 832         if json["reason"].as_str() != Some("compiler-artifact") {
 833             continue
 834         }
 835         for filename in json["filenames"].as_array().unwrap() {
 836             let filename = filename.as_str().unwrap();
 837             // Skip files like executables
 838             if !filename.ends_with(".rlib") &&
 839                !filename.ends_with(".lib") &&
 840                !is_dylib(&filename) {
 841                 continue
 842             }
 843
 844             let filename = Path::new(filename);
 845
 846             // If this was an output file in the "host dir" we don't actually
 847             // worry about it, it's not relevant for us.
 848             if filename.starts_with(&host_root_dir) {
 849                 continue;
 850             }
 851
 852             // If this was output in the `deps` dir then this is a precise file
 853             // name (hash included) so we start tracking it.
 854             if filename.starts_with(&target_deps_dir) {
 855                 deps.push(filename.to_path_buf());
 856                 continue;
 857             }
 858
 859             // Otherwise this was a "top level artifact" which right now doesn't
 860             // have a hash in the name, but there's a version of this file in
 861             // the `deps` folder which *does* have a hash in the name. That's
 862             // the one we'll want to we'll probe for it later.
 863             //
 864             // We do not use `Path::file_stem` or `Path::extension` here,
 865             // because some generated files may have multiple extensions e.g.
 866             // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
 867             // split the file name by the last extension (`.lib`) while we need
 868             // to split by all extensions (`.dll.lib`).
 869             let expected_len = t!(filename.metadata()).len();
 870             let filename = filename.file_name().unwrap().to_str().unwrap();
 871             let mut parts = filename.splitn(2, '.');
 872             let file_stem = parts.next().unwrap().to_owned();
 873             let extension = parts.next().unwrap().to_owned();
 874
 875             toplevel.push((file_stem, extension, expected_len));
 876         }
 877     }
 878
 879     // Make sure Cargo actually succeeded after we read all of its stdout.
 880     let status = t!(child.wait());
 881     if !status.success() {
 882         panic!("command did not execute successfully: {:?}\n\
 883                 expected success, got: {}",
 884                cargo,
 885                status);
 886     }
 887
 888     // Ok now we need to actually find all the files listed in `toplevel`. We've
 889     // got a list of prefix/extensions and we basically just need to find the
 890     // most recent file in the `deps` folder corresponding to each one.
 891     let contents = t!(target_deps_dir.read_dir())
 892         .map(|e| t!(e))
 893         .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
 894         .collect::<Vec<_>>();
 895     for (prefix, extension, expected_len) in toplevel {
 896         let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
 897             filename.starts_with(&prefix[..]) &&
 898                 filename[prefix.len()..].starts_with("-") &&
 899                 filename.ends_with(&extension[..]) &&
 900                 meta.len() == expected_len
 901         });
 902         let max = candidates.max_by_key(|&&(_, _, ref metadata)| {
 903             FileTime::from_last_modification_time(metadata)
 904         });
 905         let path_to_add = match max {
 906             Some(triple) => triple.0.to_str().unwrap(),
 907             None => panic!("no output generated for {:?} {:?}", prefix, extension),
 908         };
 909         if is_dylib(path_to_add) {
 910             let candidate = format!("{}.lib", path_to_add);
 911             let candidate = PathBuf::from(candidate);
 912             if candidate.exists() {
 913                 deps.push(candidate);
 914             }
 915         }
 916         deps.push(path_to_add.into());
 917     }
 918
 919     // Now we want to update the contents of the stamp file, if necessary. First
 920     // we read off the previous contents along with its mtime. If our new
 921     // contents (the list of files to copy) is different or if any dep's mtime
 922     // is newer then we rewrite the stamp file.
 923     deps.sort();
 924     let mut stamp_contents = Vec::new();
 925     if let Ok(mut f) = File::open(stamp) {
 926         t!(f.read_to_end(&mut stamp_contents));
 927     }
 928     let stamp_mtime = mtime(&stamp);
 929     let mut new_contents = Vec::new();
 930     let mut max = None;
 931     let mut max_path = None;
 932     for dep in deps {
 933         let mtime = mtime(&dep);
 934         if Some(mtime) > max {
 935             max = Some(mtime);
 936             max_path = Some(dep.clone());
 937         }
 938         new_contents.extend(dep.to_str().unwrap().as_bytes());
 939         new_contents.extend(b"\0");
 940     }
 941     let max = max.unwrap();
 942     let max_path = max_path.unwrap();
 943     if stamp_contents == new_contents && max <= stamp_mtime {
 944         build.verbose(&format!("not updating {:?}; contents equal and {} <= {}",
 945                 stamp, max, stamp_mtime));
 946         return
 947     }
 948     if max > stamp_mtime {
 949         build.verbose(&format!("updating {:?} as {:?} changed", stamp, max_path));
 950     } else {
 951         build.verbose(&format!("updating {:?} as deps changed", stamp));
 952     }
 953     t!(t!(File::create(stamp)).write_all(&new_contents));
 954 }