1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Implementation of compiling various phases of the compiler and standard
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.
21 use std::fs::{self, File};
22 use std::io::BufReader;
23 use std::io::prelude::*;
24 use std::path::{Path, PathBuf};
25 use std::process::{Command, Stdio};
28 use build_helper::{output, mtime, up_to_date};
29 use filetime::FileTime;
32 use util::{exe, libdir, is_dylib};
33 use {Compiler, Mode, GitRepo};
36 use cache::{INTERNER, Interned};
37 use builder::{Step, RunConfig, ShouldRun, Builder};
39 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
41 pub target: Interned<String>,
42 pub compiler: Compiler,
47 const DEFAULT: bool = true;
49 fn should_run(run: ShouldRun) -> ShouldRun {
53 fn make_run(run: RunConfig) {
54 run.builder.ensure(Std {
55 compiler: run.builder.compiler(run.builder.top_stage, run.host),
60 /// Build the standard library.
62 /// This will build the standard library for a particular stage of the build
63 /// using the `compiler` targeting the `target` architecture. The artifacts
64 /// created will also be linked into the sysroot directory.
65 fn run(self, builder: &Builder) {
66 let target = self.target;
67 let compiler = self.compiler;
69 if builder.config.keep_stage.contains(&compiler.stage) {
70 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
71 builder.ensure(StdLink {
73 target_compiler: compiler,
79 builder.ensure(StartupObjects { compiler, target });
81 if builder.force_use_stage1(compiler, target) {
82 let from = builder.compiler(1, builder.config.build);
87 builder.info(&format!("Uplifting stage1 std ({} -> {})", from.host, target));
89 // Even if we're not building std this stage, the new sysroot must
90 // still contain the musl startup objects.
91 if target.contains("musl") {
92 let libdir = builder.sysroot_libdir(compiler, target);
93 copy_musl_third_party_objects(builder, target, &libdir);
96 builder.ensure(StdLink {
98 target_compiler: compiler,
104 if target.contains("musl") {
105 let libdir = builder.sysroot_libdir(compiler, target);
106 copy_musl_third_party_objects(builder, target, &libdir);
109 let mut cargo = builder.cargo(compiler, Mode::Std, target, "build");
110 std_cargo(builder, &compiler, target, &mut cargo);
112 let _folder = builder.fold_output(|| format!("stage{}-std", compiler.stage));
113 builder.info(&format!("Building stage{} std artifacts ({} -> {})", compiler.stage,
114 &compiler.host, target));
118 &libstd_stamp(builder, compiler, target),
121 builder.ensure(StdLink {
122 compiler: builder.compiler(compiler.stage, builder.config.build),
123 target_compiler: compiler,
129 /// Copies the crt(1,i,n).o startup objects
131 /// Since musl supports fully static linking, we can cross link for it even
132 /// with a glibc-targeting toolchain, given we have the appropriate startup
133 /// files. As those shipped with glibc won't work, copy the ones provided by
134 /// musl so we have them on linux-gnu hosts.
135 fn copy_musl_third_party_objects(builder: &Builder,
136 target: Interned<String>,
138 for &obj in &["crt1.o", "crti.o", "crtn.o"] {
139 builder.copy(&builder.musl_root(target).unwrap().join("lib").join(obj), &into.join(obj));
143 /// Configure cargo to compile the standard library, adding appropriate env vars
145 pub fn std_cargo(builder: &Builder,
147 target: Interned<String>,
148 cargo: &mut Command) {
149 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
150 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
153 if builder.no_std(target) == Some(true) {
154 // for no-std targets we only compile a few no_std crates
155 cargo.arg("--features").arg("c mem")
156 .args(&["-p", "alloc"])
157 .args(&["-p", "compiler_builtins"])
158 .arg("--manifest-path")
159 .arg(builder.src.join("src/rustc/compiler_builtins_shim/Cargo.toml"));
161 let mut features = builder.std_features();
163 // When doing a local rebuild we tell cargo that we're stage1 rather than
164 // stage0. This works fine if the local rust and being-built rust have the
165 // same view of what the default allocator is, but fails otherwise. Since
166 // we don't have a way to express an allocator preference yet, work
167 // around the issue in the case of a local rebuild with jemalloc disabled.
168 if compiler.stage == 0 && builder.local_rebuild && !builder.config.use_jemalloc {
169 features.push_str(" force_alloc_system");
172 if compiler.stage != 0 && builder.config.sanitizers {
173 // This variable is used by the sanitizer runtime crates, e.g.
174 // rustc_lsan, to build the sanitizer runtime from C code
175 // When this variable is missing, those crates won't compile the C code,
176 // so we don't set this variable during stage0 where llvm-config is
178 // We also only build the runtimes when --enable-sanitizers (or its
179 // config.toml equivalent) is used
180 let llvm_config = builder.ensure(native::Llvm {
181 target: builder.config.build,
184 cargo.env("LLVM_CONFIG", llvm_config);
187 cargo.arg("--features").arg(features)
188 .arg("--manifest-path")
189 .arg(builder.src.join("src/libstd/Cargo.toml"));
191 if let Some(target) = builder.config.target_config.get(&target) {
192 if let Some(ref jemalloc) = target.jemalloc {
193 cargo.env("JEMALLOC_OVERRIDE", jemalloc);
196 if target.contains("musl") {
197 if let Some(p) = builder.musl_root(target) {
198 cargo.env("MUSL_ROOT", p);
204 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
206 pub compiler: Compiler,
207 pub target_compiler: Compiler,
208 pub target: Interned<String>,
211 impl Step for StdLink {
214 fn should_run(run: ShouldRun) -> ShouldRun {
218 /// Link all libstd rlibs/dylibs into the sysroot location.
220 /// Links those artifacts generated by `compiler` to a the `stage` compiler's
221 /// sysroot for the specified `host` and `target`.
223 /// Note that this assumes that `compiler` has already generated the libstd
224 /// libraries for `target`, and this method will find them in the relevant
225 /// output directory.
226 fn run(self, builder: &Builder) {
227 let compiler = self.compiler;
228 let target_compiler = self.target_compiler;
229 let target = self.target;
230 builder.info(&format!("Copying stage{} std from stage{} ({} -> {} / {})",
231 target_compiler.stage,
234 target_compiler.host,
236 let libdir = builder.sysroot_libdir(target_compiler, target);
237 add_to_sysroot(builder, &libdir, &libstd_stamp(builder, compiler, target));
239 if builder.config.sanitizers && compiler.stage != 0 && target == "x86_64-apple-darwin" {
240 // The sanitizers are only built in stage1 or above, so the dylibs will
241 // be missing in stage0 and causes panic. See the `std()` function above
242 // for reason why the sanitizers are not built in stage0.
243 copy_apple_sanitizer_dylibs(builder, &builder.native_dir(target), "osx", &libdir);
246 builder.cargo(target_compiler, Mode::ToolStd, target, "clean");
250 fn copy_apple_sanitizer_dylibs(builder: &Builder, native_dir: &Path, platform: &str, into: &Path) {
251 for &sanitizer in &["asan", "tsan"] {
252 let filename = format!("lib__rustc__clang_rt.{}_{}_dynamic.dylib", sanitizer, platform);
253 let mut src_path = native_dir.join(sanitizer);
254 src_path.push("build");
255 src_path.push("lib");
256 src_path.push("darwin");
257 src_path.push(&filename);
258 builder.copy(&src_path, &into.join(filename));
262 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
263 pub struct StartupObjects {
264 pub compiler: Compiler,
265 pub target: Interned<String>,
268 impl Step for StartupObjects {
271 fn should_run(run: ShouldRun) -> ShouldRun {
272 run.path("src/rtstartup")
275 fn make_run(run: RunConfig) {
276 run.builder.ensure(StartupObjects {
277 compiler: run.builder.compiler(run.builder.top_stage, run.host),
282 /// Build and prepare startup objects like rsbegin.o and rsend.o
284 /// These are primarily used on Windows right now for linking executables/dlls.
285 /// They don't require any library support as they're just plain old object
286 /// files, so we just use the nightly snapshot compiler to always build them (as
287 /// no other compilers are guaranteed to be available).
288 fn run(self, builder: &Builder) {
289 let for_compiler = self.compiler;
290 let target = self.target;
291 if !target.contains("pc-windows-gnu") {
295 let src_dir = &builder.src.join("src/rtstartup");
296 let dst_dir = &builder.native_dir(target).join("rtstartup");
297 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
298 t!(fs::create_dir_all(dst_dir));
300 for file in &["rsbegin", "rsend"] {
301 let src_file = &src_dir.join(file.to_string() + ".rs");
302 let dst_file = &dst_dir.join(file.to_string() + ".o");
303 if !up_to_date(src_file, dst_file) {
304 let mut cmd = Command::new(&builder.initial_rustc);
305 builder.run(cmd.env("RUSTC_BOOTSTRAP", "1")
306 .arg("--cfg").arg("stage0")
307 .arg("--target").arg(target)
309 .arg("-o").arg(dst_file)
313 builder.copy(dst_file, &sysroot_dir.join(file.to_string() + ".o"));
316 for obj in ["crt2.o", "dllcrt2.o"].iter() {
317 let src = compiler_file(builder,
321 builder.copy(&src, &sysroot_dir.join(obj));
326 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
328 pub target: Interned<String>,
329 pub compiler: Compiler,
334 const DEFAULT: bool = true;
336 fn should_run(run: ShouldRun) -> ShouldRun {
337 run.all_krates("test")
340 fn make_run(run: RunConfig) {
341 run.builder.ensure(Test {
342 compiler: run.builder.compiler(run.builder.top_stage, run.host),
349 /// This will build libtest and supporting libraries for a particular stage of
350 /// the build using the `compiler` targeting the `target` architecture. The
351 /// artifacts created will also be linked into the sysroot directory.
352 fn run(self, builder: &Builder) {
353 let target = self.target;
354 let compiler = self.compiler;
356 builder.ensure(Std { compiler, target });
358 if builder.config.keep_stage.contains(&compiler.stage) {
359 builder.info("Warning: Using a potentially old libtest. This may not behave well.");
360 builder.ensure(TestLink {
362 target_compiler: compiler,
368 if builder.force_use_stage1(compiler, target) {
369 builder.ensure(Test {
370 compiler: builder.compiler(1, builder.config.build),
374 &format!("Uplifting stage1 test ({} -> {})", builder.config.build, target));
375 builder.ensure(TestLink {
376 compiler: builder.compiler(1, builder.config.build),
377 target_compiler: compiler,
383 let mut cargo = builder.cargo(compiler, Mode::Test, target, "build");
384 test_cargo(builder, &compiler, target, &mut cargo);
386 let _folder = builder.fold_output(|| format!("stage{}-test", compiler.stage));
387 builder.info(&format!("Building stage{} test artifacts ({} -> {})", compiler.stage,
388 &compiler.host, target));
392 &libtest_stamp(builder, compiler, target),
395 builder.ensure(TestLink {
396 compiler: builder.compiler(compiler.stage, builder.config.build),
397 target_compiler: compiler,
403 /// Same as `std_cargo`, but for libtest
404 pub fn test_cargo(builder: &Builder,
405 _compiler: &Compiler,
406 _target: Interned<String>,
407 cargo: &mut Command) {
408 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
409 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
411 cargo.arg("--manifest-path")
412 .arg(builder.src.join("src/libtest/Cargo.toml"));
415 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
416 pub struct TestLink {
417 pub compiler: Compiler,
418 pub target_compiler: Compiler,
419 pub target: Interned<String>,
422 impl Step for TestLink {
425 fn should_run(run: ShouldRun) -> ShouldRun {
429 /// Same as `std_link`, only for libtest
430 fn run(self, builder: &Builder) {
431 let compiler = self.compiler;
432 let target_compiler = self.target_compiler;
433 let target = self.target;
434 builder.info(&format!("Copying stage{} test from stage{} ({} -> {} / {})",
435 target_compiler.stage,
438 target_compiler.host,
440 add_to_sysroot(builder, &builder.sysroot_libdir(target_compiler, target),
441 &libtest_stamp(builder, compiler, target));
443 builder.cargo(target_compiler, Mode::ToolTest, target, "clean");
447 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
449 pub target: Interned<String>,
450 pub compiler: Compiler,
453 impl Step for Rustc {
455 const ONLY_HOSTS: bool = true;
456 const DEFAULT: bool = true;
458 fn should_run(run: ShouldRun) -> ShouldRun {
459 run.all_krates("rustc-main")
462 fn make_run(run: RunConfig) {
463 run.builder.ensure(Rustc {
464 compiler: run.builder.compiler(run.builder.top_stage, run.host),
469 /// Build the compiler.
471 /// This will build the compiler for a particular stage of the build using
472 /// the `compiler` targeting the `target` architecture. The artifacts
473 /// created will also be linked into the sysroot directory.
474 fn run(self, builder: &Builder) {
475 let compiler = self.compiler;
476 let target = self.target;
478 builder.ensure(Test { compiler, target });
480 if builder.config.keep_stage.contains(&compiler.stage) {
481 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
482 builder.ensure(RustcLink {
484 target_compiler: compiler,
490 if builder.force_use_stage1(compiler, target) {
491 builder.ensure(Rustc {
492 compiler: builder.compiler(1, builder.config.build),
495 builder.info(&format!("Uplifting stage1 rustc ({} -> {})",
496 builder.config.build, target));
497 builder.ensure(RustcLink {
498 compiler: builder.compiler(1, builder.config.build),
499 target_compiler: compiler,
505 // Ensure that build scripts have a std to link against.
507 compiler: builder.compiler(self.compiler.stage, builder.config.build),
508 target: builder.config.build,
511 let mut cargo = builder.cargo(compiler, Mode::Rustc, target, "build");
512 rustc_cargo(builder, &mut cargo);
514 let _folder = builder.fold_output(|| format!("stage{}-rustc", compiler.stage));
515 builder.info(&format!("Building stage{} compiler artifacts ({} -> {})",
516 compiler.stage, &compiler.host, target));
520 &librustc_stamp(builder, compiler, target),
523 builder.ensure(RustcLink {
524 compiler: builder.compiler(compiler.stage, builder.config.build),
525 target_compiler: compiler,
531 pub fn rustc_cargo(builder: &Builder, cargo: &mut Command) {
532 cargo.arg("--features").arg(builder.rustc_features())
533 .arg("--manifest-path")
534 .arg(builder.src.join("src/rustc/Cargo.toml"));
535 rustc_cargo_env(builder, cargo);
538 pub fn rustc_cargo_env(builder: &Builder, cargo: &mut Command) {
539 // Set some configuration variables picked up by build scripts and
540 // the compiler alike
541 cargo.env("CFG_RELEASE", builder.rust_release())
542 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
543 .env("CFG_VERSION", builder.rust_version())
544 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default())
545 .env("CFG_CODEGEN_BACKENDS_DIR", &builder.config.rust_codegen_backends_dir);
547 let libdir_relative = builder.config.libdir_relative().unwrap_or(Path::new("lib"));
548 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
550 // If we're not building a compiler with debugging information then remove
551 // these two env vars which would be set otherwise.
552 if builder.config.rust_debuginfo_only_std {
553 cargo.env_remove("RUSTC_DEBUGINFO");
554 cargo.env_remove("RUSTC_DEBUGINFO_LINES");
557 if let Some(ref ver_date) = builder.rust_info.commit_date() {
558 cargo.env("CFG_VER_DATE", ver_date);
560 if let Some(ref ver_hash) = builder.rust_info.sha() {
561 cargo.env("CFG_VER_HASH", ver_hash);
563 if !builder.unstable_features() {
564 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
566 if let Some(ref s) = builder.config.rustc_default_linker {
567 cargo.env("CFG_DEFAULT_LINKER", s);
569 if builder.config.rustc_parallel_queries {
570 cargo.env("RUSTC_PARALLEL_QUERIES", "1");
574 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
576 pub compiler: Compiler,
577 pub target_compiler: Compiler,
578 pub target: Interned<String>,
581 impl Step for RustcLink {
584 fn should_run(run: ShouldRun) -> ShouldRun {
588 /// Same as `std_link`, only for librustc
589 fn run(self, builder: &Builder) {
590 let compiler = self.compiler;
591 let target_compiler = self.target_compiler;
592 let target = self.target;
593 builder.info(&format!("Copying stage{} rustc from stage{} ({} -> {} / {})",
594 target_compiler.stage,
597 target_compiler.host,
599 add_to_sysroot(builder, &builder.sysroot_libdir(target_compiler, target),
600 &librustc_stamp(builder, compiler, target));
601 builder.cargo(target_compiler, Mode::ToolRustc, target, "clean");
605 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
606 pub struct CodegenBackend {
607 pub compiler: Compiler,
608 pub target: Interned<String>,
609 pub backend: Interned<String>,
612 impl Step for CodegenBackend {
614 const ONLY_HOSTS: bool = true;
615 const DEFAULT: bool = true;
617 fn should_run(run: ShouldRun) -> ShouldRun {
618 run.all_krates("rustc_codegen_llvm")
621 fn make_run(run: RunConfig) {
622 let backend = run.builder.config.rust_codegen_backends.get(0);
623 let backend = backend.cloned().unwrap_or_else(|| {
624 INTERNER.intern_str("llvm")
626 run.builder.ensure(CodegenBackend {
627 compiler: run.builder.compiler(run.builder.top_stage, run.host),
633 fn run(self, builder: &Builder) {
634 let compiler = self.compiler;
635 let target = self.target;
636 let backend = self.backend;
638 builder.ensure(Rustc { compiler, target });
640 if builder.config.keep_stage.contains(&compiler.stage) {
641 builder.info("Warning: Using a potentially old codegen backend. \
642 This may not behave well.");
643 // Codegen backends are linked separately from this step today, so we don't do
648 if builder.force_use_stage1(compiler, target) {
649 builder.ensure(CodegenBackend {
650 compiler: builder.compiler(1, builder.config.build),
657 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
659 let mut cargo = builder.cargo(compiler, Mode::Codegen, target, "rustc");
660 cargo.arg("--manifest-path")
661 .arg(builder.src.join("src/librustc_codegen_llvm/Cargo.toml"));
662 rustc_cargo_env(builder, &mut cargo);
664 let features = build_codegen_backend(&builder, &mut cargo, &compiler, target, backend);
666 let mut cargo_tails_args = vec![];
668 if builder.config.llvm_thin_lto {
669 cargo_tails_args.push("--".to_string());
671 let num_jobs = builder.jobs();
673 if !target.contains("msvc") {
674 // Here we assume that the linker is clang. If it's not, there'll
676 cargo_tails_args.push("-Clink-arg=-fuse-ld=lld".to_string());
677 cargo_tails_args.push("-Clink-arg=-flto=thin".to_string());
679 if builder.config.llvm_optimize {
680 cargo_tails_args.push("-Clink-arg=-O2".to_string());
683 // Let's make LLD respect the `-j` option.
684 let num_jobs_arg = format!("-Clink-arg=-Wl,--thinlto-jobs={}", num_jobs);
685 cargo_tails_args.push(num_jobs_arg);
687 // Here we assume that the linker is lld-link.exe. lld-link.exe
688 // does not need the extra arguments except for num_jobs
689 let num_jobs_arg = format!("-Clink-arg=/opt:lldltojobs={}", num_jobs);
690 cargo_tails_args.push(num_jobs_arg);
694 let tmp_stamp = out_dir.join(".tmp.stamp");
696 let _folder = builder.fold_output(|| format!("stage{}-rustc_codegen_llvm", compiler.stage));
697 let files = run_cargo(builder,
698 cargo.arg("--features").arg(features),
702 if builder.config.dry_run {
705 let mut files = files.into_iter()
707 let filename = f.file_name().unwrap().to_str().unwrap();
708 is_dylib(filename) && filename.contains("rustc_codegen_llvm-")
710 let codegen_backend = match files.next() {
712 None => panic!("no dylibs built for codegen backend?"),
714 if let Some(f) = files.next() {
715 panic!("codegen backend built two dylibs:\n{}\n{}",
716 codegen_backend.display(),
719 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
720 let codegen_backend = codegen_backend.to_str().unwrap();
721 t!(t!(File::create(&stamp)).write_all(codegen_backend.as_bytes()));
725 pub fn build_codegen_backend(builder: &Builder,
728 target: Interned<String>,
729 backend: Interned<String>) -> String {
730 let mut features = String::new();
733 "llvm" | "emscripten" => {
734 // Build LLVM for our target. This will implicitly build the
735 // host LLVM if necessary.
736 let llvm_config = builder.ensure(native::Llvm {
738 emscripten: backend == "emscripten",
741 if backend == "emscripten" {
742 features.push_str(" emscripten");
745 builder.info(&format!("Building stage{} codegen artifacts ({} -> {}, {})",
746 compiler.stage, &compiler.host, target, backend));
748 // Pass down configuration from the LLVM build into the build of
749 // librustc_llvm and librustc_codegen_llvm.
750 if builder.is_rust_llvm(target) {
751 cargo.env("LLVM_RUSTLLVM", "1");
753 cargo.env("LLVM_CONFIG", &llvm_config);
754 if backend != "emscripten" {
755 let target_config = builder.config.target_config.get(&target);
756 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
757 cargo.env("CFG_LLVM_ROOT", s);
760 // Building with a static libstdc++ is only supported on linux right now,
761 // not for MSVC or macOS
762 if builder.config.llvm_static_stdcpp &&
763 !target.contains("freebsd") &&
764 !target.contains("windows") &&
765 !target.contains("apple") {
766 let file = compiler_file(builder,
767 builder.cxx(target).unwrap(),
770 cargo.env("LLVM_STATIC_STDCPP", file);
772 if builder.config.llvm_link_shared {
773 cargo.env("LLVM_LINK_SHARED", "1");
776 _ => panic!("unknown backend: {}", backend),
782 /// Creates the `codegen-backends` folder for a compiler that's about to be
783 /// assembled as a complete compiler.
785 /// This will take the codegen artifacts produced by `compiler` and link them
786 /// into an appropriate location for `target_compiler` to be a functional
788 fn copy_codegen_backends_to_sysroot(builder: &Builder,
790 target_compiler: Compiler) {
791 let target = target_compiler.host;
793 // Note that this step is different than all the other `*Link` steps in
794 // that it's not assembling a bunch of libraries but rather is primarily
795 // moving the codegen backend into place. The codegen backend of rustc is
796 // not linked into the main compiler by default but is rather dynamically
797 // selected at runtime for inclusion.
799 // Here we're looking for the output dylib of the `CodegenBackend` step and
800 // we're copying that into the `codegen-backends` folder.
801 let dst = builder.sysroot_codegen_backends(target_compiler);
802 t!(fs::create_dir_all(&dst));
804 if builder.config.dry_run {
808 for backend in builder.config.rust_codegen_backends.iter() {
809 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
810 let mut dylib = String::new();
811 t!(t!(File::open(&stamp)).read_to_string(&mut dylib));
812 let file = Path::new(&dylib);
813 let filename = file.file_name().unwrap().to_str().unwrap();
814 // change `librustc_codegen_llvm-xxxxxx.so` to `librustc_codegen_llvm-llvm.so`
815 let target_filename = {
816 let dash = filename.find("-").unwrap();
817 let dot = filename.find(".").unwrap();
823 builder.copy(&file, &dst.join(target_filename));
827 fn copy_lld_to_sysroot(builder: &Builder,
828 target_compiler: Compiler,
829 lld_install_root: &Path) {
830 let target = target_compiler.host;
832 let dst = builder.sysroot_libdir(target_compiler, target)
836 t!(fs::create_dir_all(&dst));
838 let src_exe = exe("lld", &target);
839 let dst_exe = exe("rust-lld", &target);
840 // we prepend this bin directory to the user PATH when linking Rust binaries. To
841 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
842 builder.copy(&lld_install_root.join("bin").join(&src_exe), &dst.join(&dst_exe));
845 /// Cargo's output path for the standard library in a given stage, compiled
846 /// by a particular compiler for the specified target.
847 pub fn libstd_stamp(builder: &Builder, compiler: Compiler, target: Interned<String>) -> PathBuf {
848 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
851 /// Cargo's output path for libtest in a given stage, compiled by a particular
852 /// compiler for the specified target.
853 pub fn libtest_stamp(builder: &Builder, compiler: Compiler, target: Interned<String>) -> PathBuf {
854 builder.cargo_out(compiler, Mode::Test, target).join(".libtest.stamp")
857 /// Cargo's output path for librustc in a given stage, compiled by a particular
858 /// compiler for the specified target.
859 pub fn librustc_stamp(builder: &Builder, compiler: Compiler, target: Interned<String>) -> PathBuf {
860 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
863 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
864 /// compiler for the specified target and backend.
865 fn codegen_backend_stamp(builder: &Builder,
867 target: Interned<String>,
868 backend: Interned<String>) -> PathBuf {
869 builder.cargo_out(compiler, Mode::Codegen, target)
870 .join(format!(".librustc_codegen_llvm-{}.stamp", backend))
873 pub fn compiler_file(builder: &Builder,
875 target: Interned<String>,
876 file: &str) -> PathBuf {
877 let mut cmd = Command::new(compiler);
878 cmd.args(builder.cflags(target, GitRepo::Rustc));
879 cmd.arg(format!("-print-file-name={}", file));
880 let out = output(&mut cmd);
881 PathBuf::from(out.trim())
884 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
886 pub compiler: Compiler,
889 impl Step for Sysroot {
890 type Output = Interned<PathBuf>;
892 fn should_run(run: ShouldRun) -> ShouldRun {
896 /// Returns the sysroot for the `compiler` specified that *this build system
899 /// That is, the sysroot for the stage0 compiler is not what the compiler
900 /// thinks it is by default, but it's the same as the default for stages
902 fn run(self, builder: &Builder) -> Interned<PathBuf> {
903 let compiler = self.compiler;
904 let sysroot = if compiler.stage == 0 {
905 builder.out.join(&compiler.host).join("stage0-sysroot")
907 builder.out.join(&compiler.host).join(format!("stage{}", compiler.stage))
909 let _ = fs::remove_dir_all(&sysroot);
910 t!(fs::create_dir_all(&sysroot));
911 INTERNER.intern_path(sysroot)
915 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
916 pub struct Assemble {
917 /// The compiler which we will produce in this step. Assemble itself will
918 /// take care of ensuring that the necessary prerequisites to do so exist,
919 /// that is, this target can be a stage2 compiler and Assemble will build
920 /// previous stages for you.
921 pub target_compiler: Compiler,
924 impl Step for Assemble {
925 type Output = Compiler;
927 fn should_run(run: ShouldRun) -> ShouldRun {
931 /// Prepare a new compiler from the artifacts in `stage`
933 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
934 /// must have been previously produced by the `stage - 1` builder.build
936 fn run(self, builder: &Builder) -> Compiler {
937 let target_compiler = self.target_compiler;
939 if target_compiler.stage == 0 {
940 assert_eq!(builder.config.build, target_compiler.host,
941 "Cannot obtain compiler for non-native build triple at stage 0");
942 // The stage 0 compiler for the build triple is always pre-built.
943 return target_compiler;
946 // Get the compiler that we'll use to bootstrap ourselves.
948 // Note that this is where the recursive nature of the bootstrap
949 // happens, as this will request the previous stage's compiler on
950 // downwards to stage 0.
952 // Also note that we're building a compiler for the host platform. We
953 // only assume that we can run `build` artifacts, which means that to
954 // produce some other architecture compiler we need to start from
955 // `build` to get there.
957 // FIXME: Perhaps we should download those libraries?
958 // It would make builds faster...
960 // FIXME: It may be faster if we build just a stage 1 compiler and then
961 // use that to bootstrap this compiler forward.
963 builder.compiler(target_compiler.stage - 1, builder.config.build);
965 // Build the libraries for this compiler to link to (i.e., the libraries
966 // it uses at runtime). NOTE: Crates the target compiler compiles don't
967 // link to these. (FIXME: Is that correct? It seems to be correct most
968 // of the time but I think we do link to these for stage2/bin compilers
969 // when not performing a full bootstrap).
970 builder.ensure(Rustc {
971 compiler: build_compiler,
972 target: target_compiler.host,
974 for &backend in builder.config.rust_codegen_backends.iter() {
975 builder.ensure(CodegenBackend {
976 compiler: build_compiler,
977 target: target_compiler.host,
982 let lld_install = if builder.config.lld_enabled {
983 Some(builder.ensure(native::Lld {
984 target: target_compiler.host,
990 let stage = target_compiler.stage;
991 let host = target_compiler.host;
992 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
994 // Link in all dylibs to the libdir
995 let sysroot = builder.sysroot(target_compiler);
996 let sysroot_libdir = sysroot.join(libdir(&*host));
997 t!(fs::create_dir_all(&sysroot_libdir));
998 let src_libdir = builder.sysroot_libdir(build_compiler, host);
999 for f in builder.read_dir(&src_libdir) {
1000 let filename = f.file_name().into_string().unwrap();
1001 if is_dylib(&filename) {
1002 builder.copy(&f.path(), &sysroot_libdir.join(&filename));
1006 copy_codegen_backends_to_sysroot(builder,
1009 if let Some(lld_install) = lld_install {
1010 copy_lld_to_sysroot(builder, target_compiler, &lld_install);
1013 // Link the compiler binary itself into place
1014 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1015 let rustc = out_dir.join(exe("rustc_binary", &*host));
1016 let bindir = sysroot.join("bin");
1017 t!(fs::create_dir_all(&bindir));
1018 let compiler = builder.rustc(target_compiler);
1019 let _ = fs::remove_file(&compiler);
1020 builder.copy(&rustc, &compiler);
1026 /// Link some files into a rustc sysroot.
1028 /// For a particular stage this will link the file listed in `stamp` into the
1029 /// `sysroot_dst` provided.
1030 pub fn add_to_sysroot(builder: &Builder, sysroot_dst: &Path, stamp: &Path) {
1031 t!(fs::create_dir_all(&sysroot_dst));
1032 for path in builder.read_stamp_file(stamp) {
1033 builder.copy(&path, &sysroot_dst.join(path.file_name().unwrap()));
1037 pub fn run_cargo(builder: &Builder,
1038 cargo: &mut Command,
1039 tail_args: Vec<String>,
1044 if builder.config.dry_run {
1048 // `target_root_dir` looks like $dir/$target/release
1049 let target_root_dir = stamp.parent().unwrap();
1050 // `target_deps_dir` looks like $dir/$target/release/deps
1051 let target_deps_dir = target_root_dir.join("deps");
1052 // `host_root_dir` looks like $dir/release
1053 let host_root_dir = target_root_dir.parent().unwrap() // chop off `release`
1054 .parent().unwrap() // chop off `$target`
1055 .join(target_root_dir.file_name().unwrap());
1057 // Spawn Cargo slurping up its JSON output. We'll start building up the
1058 // `deps` array of all files it generated along with a `toplevel` array of
1059 // files we need to probe for later.
1060 let mut deps = Vec::new();
1061 let mut toplevel = Vec::new();
1062 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1063 let filenames = match msg {
1064 CargoMessage::CompilerArtifact { filenames, .. } => filenames,
1067 for filename in filenames {
1068 // Skip files like executables
1069 if !filename.ends_with(".rlib") &&
1070 !filename.ends_with(".lib") &&
1071 !is_dylib(&filename) &&
1072 !(is_check && filename.ends_with(".rmeta")) {
1076 let filename = Path::new(&*filename);
1078 // If this was an output file in the "host dir" we don't actually
1079 // worry about it, it's not relevant for us.
1080 if filename.starts_with(&host_root_dir) {
1084 // If this was output in the `deps` dir then this is a precise file
1085 // name (hash included) so we start tracking it.
1086 if filename.starts_with(&target_deps_dir) {
1087 deps.push(filename.to_path_buf());
1091 // Otherwise this was a "top level artifact" which right now doesn't
1092 // have a hash in the name, but there's a version of this file in
1093 // the `deps` folder which *does* have a hash in the name. That's
1094 // the one we'll want to we'll probe for it later.
1096 // We do not use `Path::file_stem` or `Path::extension` here,
1097 // because some generated files may have multiple extensions e.g.
1098 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1099 // split the file name by the last extension (`.lib`) while we need
1100 // to split by all extensions (`.dll.lib`).
1101 let expected_len = t!(filename.metadata()).len();
1102 let filename = filename.file_name().unwrap().to_str().unwrap();
1103 let mut parts = filename.splitn(2, '.');
1104 let file_stem = parts.next().unwrap().to_owned();
1105 let extension = parts.next().unwrap().to_owned();
1107 toplevel.push((file_stem, extension, expected_len));
1112 panic!("cargo must succeed");
1115 // Ok now we need to actually find all the files listed in `toplevel`. We've
1116 // got a list of prefix/extensions and we basically just need to find the
1117 // most recent file in the `deps` folder corresponding to each one.
1118 let contents = t!(target_deps_dir.read_dir())
1120 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1121 .collect::<Vec<_>>();
1122 for (prefix, extension, expected_len) in toplevel {
1123 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1124 filename.starts_with(&prefix[..]) &&
1125 filename[prefix.len()..].starts_with("-") &&
1126 filename.ends_with(&extension[..]) &&
1127 meta.len() == expected_len
1129 let max = candidates.max_by_key(|&&(_, _, ref metadata)| {
1130 FileTime::from_last_modification_time(metadata)
1132 let path_to_add = match max {
1133 Some(triple) => triple.0.to_str().unwrap(),
1134 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1136 if is_dylib(path_to_add) {
1137 let candidate = format!("{}.lib", path_to_add);
1138 let candidate = PathBuf::from(candidate);
1139 if candidate.exists() {
1140 deps.push(candidate);
1143 deps.push(path_to_add.into());
1146 // Now we want to update the contents of the stamp file, if necessary. First
1147 // we read off the previous contents along with its mtime. If our new
1148 // contents (the list of files to copy) is different or if any dep's mtime
1149 // is newer then we rewrite the stamp file.
1151 let mut stamp_contents = Vec::new();
1152 if let Ok(mut f) = File::open(stamp) {
1153 t!(f.read_to_end(&mut stamp_contents));
1155 let stamp_mtime = mtime(&stamp);
1156 let mut new_contents = Vec::new();
1158 let mut max_path = None;
1159 for dep in deps.iter() {
1160 let mtime = mtime(dep);
1161 if Some(mtime) > max {
1163 max_path = Some(dep.clone());
1165 new_contents.extend(dep.to_str().unwrap().as_bytes());
1166 new_contents.extend(b"\0");
1168 let max = max.unwrap();
1169 let max_path = max_path.unwrap();
1170 if stamp_contents == new_contents && max <= stamp_mtime {
1171 builder.verbose(&format!("not updating {:?}; contents equal and {:?} <= {:?}",
1172 stamp, max, stamp_mtime));
1175 if max > stamp_mtime {
1176 builder.verbose(&format!("updating {:?} as {:?} changed", stamp, max_path));
1178 builder.verbose(&format!("updating {:?} as deps changed", stamp));
1180 t!(t!(File::create(stamp)).write_all(&new_contents));
1184 pub fn stream_cargo(
1186 cargo: &mut Command,
1187 tail_args: Vec<String>,
1188 cb: &mut dyn FnMut(CargoMessage),
1190 if builder.config.dry_run {
1193 // Instruct Cargo to give us json messages on stdout, critically leaving
1194 // stderr as piped so we can get those pretty colors.
1195 cargo.arg("--message-format").arg("json")
1196 .stdout(Stdio::piped());
1198 for arg in tail_args {
1202 builder.verbose(&format!("running: {:?}", cargo));
1203 let mut child = match cargo.spawn() {
1205 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1208 // Spawn Cargo slurping up its JSON output. We'll start building up the
1209 // `deps` array of all files it generated along with a `toplevel` array of
1210 // files we need to probe for later.
1211 let stdout = BufReader::new(child.stdout.take().unwrap());
1212 for line in stdout.lines() {
1213 let line = t!(line);
1214 match serde_json::from_str::<CargoMessage>(&line) {
1216 // If this was informational, just print it out and continue
1217 Err(_) => println!("{}", line)
1221 // Make sure Cargo actually succeeded after we read all of its stdout.
1222 let status = t!(child.wait());
1223 if !status.success() {
1224 eprintln!("command did not execute successfully: {:?}\n\
1225 expected success, got: {}",
1232 #[derive(Deserialize)]
1233 #[serde(tag = "reason", rename_all = "kebab-case")]
1234 pub enum CargoMessage<'a> {
1236 package_id: Cow<'a, str>,
1237 features: Vec<Cow<'a, str>>,
1238 filenames: Vec<Cow<'a, str>>,
1240 BuildScriptExecuted {
1241 package_id: Cow<'a, str>,