1 //! Implementation of compiling various phases of the compiler and standard
4 //! This module contains some of the real meat in the rustbuild build system
5 //! which is where Cargo is used to compiler the standard library, libtest, and
6 //! compiler. This module is also responsible for assembling the sysroot as it
7 //! goes along from the output of the previous stage.
12 use std::io::prelude::*;
13 use std::io::BufReader;
14 use std::path::{Path, PathBuf};
15 use std::process::{exit, Command, Stdio};
18 use build_helper::{output, t, up_to_date};
19 use filetime::FileTime;
20 use serde::Deserialize;
22 use crate::builder::Cargo;
25 use crate::util::{exe, is_dylib, symlink_dir};
26 use crate::{Compiler, DependencyType, GitRepo, Mode};
28 use crate::builder::{Builder, Kind, RunConfig, ShouldRun, Step};
29 use crate::cache::{Interned, INTERNER};
31 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
33 pub target: Interned<String>,
34 pub compiler: Compiler,
39 const DEFAULT: bool = true;
41 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
42 run.all_krates("test")
45 fn make_run(run: RunConfig<'_>) {
46 run.builder.ensure(Std {
47 compiler: run.builder.compiler(run.builder.top_stage, run.host),
52 /// Builds the standard library.
54 /// This will build the standard library for a particular stage of the build
55 /// using the `compiler` targeting the `target` architecture. The artifacts
56 /// created will also be linked into the sysroot directory.
57 fn run(self, builder: &Builder<'_>) {
58 let target = self.target;
59 let compiler = self.compiler;
61 if builder.config.keep_stage.contains(&compiler.stage) {
62 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
63 builder.ensure(StdLink { compiler, target_compiler: compiler, target });
67 let mut target_deps = builder.ensure(StartupObjects { compiler, target });
69 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
70 if compiler_to_use != compiler {
71 builder.ensure(Std { compiler: compiler_to_use, target });
72 builder.info(&format!("Uplifting stage1 std ({} -> {})", compiler_to_use.host, target));
74 // Even if we're not building std this stage, the new sysroot must
75 // still contain the third party objects needed by various targets.
76 copy_third_party_objects(builder, &compiler, target);
77 copy_self_contained_objects(builder, &compiler, target);
79 builder.ensure(StdLink {
80 compiler: compiler_to_use,
81 target_compiler: compiler,
87 target_deps.extend(copy_third_party_objects(builder, &compiler, target));
88 target_deps.extend(copy_self_contained_objects(builder, &compiler, target));
90 let mut cargo = builder.cargo(compiler, Mode::Std, target, "build");
91 std_cargo(builder, target, compiler.stage, &mut cargo);
93 builder.info(&format!(
94 "Building stage{} std artifacts ({} -> {})",
95 compiler.stage, &compiler.host, target
101 &libstd_stamp(builder, compiler, target),
106 builder.ensure(StdLink {
107 compiler: builder.compiler(compiler.stage, builder.config.build),
108 target_compiler: compiler,
115 builder: &Builder<'_>,
119 target_deps: &mut Vec<(PathBuf, DependencyType)>,
120 dependency_type: DependencyType,
122 let target = libdir.join(name);
123 builder.copy(&sourcedir.join(name), &target);
125 target_deps.push((target, dependency_type));
128 /// Copies third party objects needed by various targets.
129 fn copy_third_party_objects(
130 builder: &Builder<'_>,
132 target: Interned<String>,
133 ) -> Vec<(PathBuf, DependencyType)> {
134 let libdir = builder.sysroot_libdir(*compiler, target);
135 let mut target_deps = vec![];
137 // Copies libunwind.a compiled to be linked with x86_64-fortanix-unknown-sgx.
139 // This target needs to be linked to Fortanix's port of llvm's libunwind.
140 // libunwind requires support for rwlock and printing to stderr,
141 // which is provided by std for this target.
142 if target == "x86_64-fortanix-unknown-sgx" {
143 let src_path_env = "X86_FORTANIX_SGX_LIBS";
145 env::var(src_path_env).unwrap_or_else(|_| panic!("{} not found in env", src_path_env));
152 DependencyType::Target,
156 if builder.config.sanitizers && compiler.stage != 0 {
157 // The sanitizers are only copied in stage1 or above,
158 // to avoid creating dependency on LLVM.
160 copy_sanitizers(builder, &compiler, target)
162 .map(|d| (d, DependencyType::Target)),
169 /// Copies third party objects needed by various targets for self-contained linkage.
170 fn copy_self_contained_objects(
171 builder: &Builder<'_>,
173 target: Interned<String>,
174 ) -> Vec<(PathBuf, DependencyType)> {
176 // Remove when upgrading bootstrap compiler.
177 let libdir_self_contained = if compiler.stage == 0 {
178 builder.sysroot_libdir(*compiler, target).to_path_buf()
180 builder.sysroot_libdir(*compiler, target).join("self-contained")
182 t!(fs::create_dir_all(&libdir_self_contained));
183 let mut target_deps = vec![];
185 // Copies the CRT objects.
187 // rustc historically provides a more self-contained installation for musl targets
188 // not requiring the presence of a native musl toolchain. For example, it can fall back
189 // to using gcc from a glibc-targeting toolchain for linking.
190 // To do that we have to distribute musl startup objects as a part of Rust toolchain
191 // and link with them manually in the self-contained mode.
192 if target.contains("musl") {
193 let srcdir = builder.musl_root(target).unwrap().join("lib");
194 for &obj in &["crt1.o", "Scrt1.o", "rcrt1.o", "crti.o", "crtn.o"] {
197 &libdir_self_contained,
201 DependencyType::TargetSelfContained,
204 } else if target.ends_with("-wasi") {
205 let srcdir = builder.wasi_root(target).unwrap().join("lib/wasm32-wasi");
208 &libdir_self_contained,
212 DependencyType::TargetSelfContained,
214 } else if target.contains("windows-gnu") {
215 for obj in ["crt2.o", "dllcrt2.o"].iter() {
216 let src = compiler_file(builder, builder.cc(target), target, obj);
217 let target = libdir_self_contained.join(obj);
218 builder.copy(&src, &target);
219 target_deps.push((target, DependencyType::TargetSelfContained));
226 /// Configure cargo to compile the standard library, adding appropriate env vars
228 pub fn std_cargo(builder: &Builder<'_>, target: Interned<String>, stage: u32, cargo: &mut Cargo) {
229 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
230 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
233 // Determine if we're going to compile in optimized C intrinsics to
234 // the `compiler-builtins` crate. These intrinsics live in LLVM's
235 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
236 // always checked out, so we need to conditionally look for this. (e.g. if
237 // an external LLVM is used we skip the LLVM submodule checkout).
239 // Note that this shouldn't affect the correctness of `compiler-builtins`,
240 // but only its speed. Some intrinsics in C haven't been translated to Rust
241 // yet but that's pretty rare. Other intrinsics have optimized
242 // implementations in C which have only had slower versions ported to Rust,
243 // so we favor the C version where we can, but it's not critical.
245 // If `compiler-rt` is available ensure that the `c` feature of the
246 // `compiler-builtins` crate is enabled and it's configured to learn where
247 // `compiler-rt` is located.
248 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
249 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
250 // Note that `libprofiler_builtins/build.rs` also computes this so if
251 // you're changing something here please also change that.
252 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
253 " compiler-builtins-c".to_string()
258 if builder.no_std(target) == Some(true) {
259 let mut features = "compiler-builtins-mem".to_string();
260 features.push_str(&compiler_builtins_c_feature);
262 // for no-std targets we only compile a few no_std crates
264 .args(&["-p", "alloc"])
265 .arg("--manifest-path")
266 .arg(builder.src.join("src/liballoc/Cargo.toml"))
268 .arg("compiler-builtins-mem compiler-builtins-c");
270 let mut features = builder.std_features();
271 features.push_str(&compiler_builtins_c_feature);
276 .arg("--manifest-path")
277 .arg(builder.src.join("src/libtest/Cargo.toml"));
279 // Help the libc crate compile by assisting it in finding various
280 // sysroot native libraries.
281 if target.contains("musl") {
282 if let Some(p) = builder.musl_root(target) {
283 let root = format!("native={}/lib", p.to_str().unwrap());
284 cargo.rustflag("-L").rustflag(&root);
288 if target.ends_with("-wasi") {
289 if let Some(p) = builder.wasi_root(target) {
290 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
291 cargo.rustflag("-L").rustflag(&root);
296 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
297 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
298 // built with bitcode so that the produced rlibs can be used for both LTO
299 // builds (which use bitcode) and non-LTO builds (which use object code).
300 // So we override the override here!
302 // But we don't bother for the stage 0 compiler because it's never used
305 cargo.rustflag("-Cembed-bitcode=yes");
308 // By default, rustc does not include unwind tables unless they are required
309 // for a particular target. They are not required by RISC-V targets, but
310 // compiling the standard library with them means that users can get
311 // backtraces without having to recompile the standard library themselves.
313 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
314 if target.contains("riscv") {
315 cargo.rustflag("-Cforce-unwind-tables=yes");
319 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
321 pub compiler: Compiler,
322 pub target_compiler: Compiler,
323 pub target: Interned<String>,
326 impl Step for StdLink {
329 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
333 /// Link all libstd rlibs/dylibs into the sysroot location.
335 /// Links those artifacts generated by `compiler` to the `stage` compiler's
336 /// sysroot for the specified `host` and `target`.
338 /// Note that this assumes that `compiler` has already generated the libstd
339 /// libraries for `target`, and this method will find them in the relevant
340 /// output directory.
341 fn run(self, builder: &Builder<'_>) {
342 let compiler = self.compiler;
343 let target_compiler = self.target_compiler;
344 let target = self.target;
345 builder.info(&format!(
346 "Copying stage{} std from stage{} ({} -> {} / {})",
347 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
349 let libdir = builder.sysroot_libdir(target_compiler, target);
350 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
351 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
355 /// Copies sanitizer runtime libraries into target libdir.
357 builder: &Builder<'_>,
359 target: Interned<String>,
361 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
363 if builder.config.dry_run {
367 let mut target_deps = Vec::new();
368 let libdir = builder.sysroot_libdir(*compiler, target);
370 for runtime in &runtimes {
371 let dst = libdir.join(&runtime.name);
372 builder.copy(&runtime.path, &dst);
374 if target == "x86_64-apple-darwin" {
375 // Update the library install name reflect the fact it has been renamed.
376 let status = Command::new("install_name_tool")
378 .arg(format!("@rpath/{}", runtime.name))
381 .expect("failed to execute `install_name_tool`");
382 assert!(status.success());
385 target_deps.push(dst);
391 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
392 pub struct StartupObjects {
393 pub compiler: Compiler,
394 pub target: Interned<String>,
397 impl Step for StartupObjects {
398 type Output = Vec<(PathBuf, DependencyType)>;
400 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
401 run.path("src/rtstartup")
404 fn make_run(run: RunConfig<'_>) {
405 run.builder.ensure(StartupObjects {
406 compiler: run.builder.compiler(run.builder.top_stage, run.host),
411 /// Builds and prepare startup objects like rsbegin.o and rsend.o
413 /// These are primarily used on Windows right now for linking executables/dlls.
414 /// They don't require any library support as they're just plain old object
415 /// files, so we just use the nightly snapshot compiler to always build them (as
416 /// no other compilers are guaranteed to be available).
417 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
418 let for_compiler = self.compiler;
419 let target = self.target;
420 if !target.contains("windows-gnu") {
424 let mut target_deps = vec![];
426 let src_dir = &builder.src.join("src/rtstartup");
427 let dst_dir = &builder.native_dir(target).join("rtstartup");
428 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
429 t!(fs::create_dir_all(dst_dir));
431 for file in &["rsbegin", "rsend"] {
432 let src_file = &src_dir.join(file.to_string() + ".rs");
433 let dst_file = &dst_dir.join(file.to_string() + ".o");
434 if !up_to_date(src_file, dst_file) {
435 let mut cmd = Command::new(&builder.initial_rustc);
437 cmd.env("RUSTC_BOOTSTRAP", "1")
449 let target = sysroot_dir.join((*file).to_string() + ".o");
450 builder.copy(dst_file, &target);
451 target_deps.push((target, DependencyType::Target));
458 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
460 pub target: Interned<String>,
461 pub compiler: Compiler,
464 impl Step for Rustc {
466 const ONLY_HOSTS: bool = true;
467 const DEFAULT: bool = true;
469 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
470 run.all_krates("rustc-main")
473 fn make_run(run: RunConfig<'_>) {
474 run.builder.ensure(Rustc {
475 compiler: run.builder.compiler(run.builder.top_stage, run.host),
480 /// Builds the compiler.
482 /// This will build the compiler for a particular stage of the build using
483 /// the `compiler` targeting the `target` architecture. The artifacts
484 /// created will also be linked into the sysroot directory.
485 fn run(self, builder: &Builder<'_>) {
486 let compiler = self.compiler;
487 let target = self.target;
489 builder.ensure(Std { compiler, target });
491 if builder.config.keep_stage.contains(&compiler.stage) {
492 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
493 builder.ensure(RustcLink { compiler, target_compiler: compiler, target });
497 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
498 if compiler_to_use != compiler {
499 builder.ensure(Rustc { compiler: compiler_to_use, target });
501 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
502 builder.ensure(RustcLink {
503 compiler: compiler_to_use,
504 target_compiler: compiler,
510 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
512 compiler: builder.compiler(self.compiler.stage, builder.config.build),
513 target: builder.config.build,
516 let mut cargo = builder.cargo(compiler, Mode::Rustc, target, "build");
517 rustc_cargo(builder, &mut cargo, target);
519 builder.info(&format!(
520 "Building stage{} compiler artifacts ({} -> {})",
521 compiler.stage, &compiler.host, target
527 &librustc_stamp(builder, compiler, target),
532 builder.ensure(RustcLink {
533 compiler: builder.compiler(compiler.stage, builder.config.build),
534 target_compiler: compiler,
540 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: Interned<String>) {
543 .arg(builder.rustc_features())
544 .arg("--manifest-path")
545 .arg(builder.src.join("src/rustc/Cargo.toml"));
546 rustc_cargo_env(builder, cargo, target);
549 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: Interned<String>) {
550 // Set some configuration variables picked up by build scripts and
551 // the compiler alike
553 .env("CFG_RELEASE", builder.rust_release())
554 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
555 .env("CFG_VERSION", builder.rust_version())
556 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default());
558 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
559 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
561 if let Some(ref ver_date) = builder.rust_info.commit_date() {
562 cargo.env("CFG_VER_DATE", ver_date);
564 if let Some(ref ver_hash) = builder.rust_info.sha() {
565 cargo.env("CFG_VER_HASH", ver_hash);
567 if !builder.unstable_features() {
568 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
570 if let Some(ref s) = builder.config.rustc_default_linker {
571 cargo.env("CFG_DEFAULT_LINKER", s);
573 if builder.config.rustc_parallel {
574 cargo.rustflag("--cfg=parallel_compiler");
576 if builder.config.rust_verify_llvm_ir {
577 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
580 // Pass down configuration from the LLVM build into the build of
581 // librustc_llvm and librustc_codegen_llvm.
583 // Note that this is disabled if LLVM itself is disabled or we're in a check
584 // build. If we are in a check build we still go ahead here presuming we've
585 // detected that LLVM is alreay built and good to go which helps prevent
586 // busting caches (e.g. like #71152).
587 if builder.config.llvm_enabled()
588 && (builder.kind != Kind::Check
589 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
591 if builder.is_rust_llvm(target) {
592 cargo.env("LLVM_RUSTLLVM", "1");
594 let llvm_config = builder.ensure(native::Llvm { target });
595 cargo.env("LLVM_CONFIG", &llvm_config);
596 let target_config = builder.config.target_config.get(&target);
597 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
598 cargo.env("CFG_LLVM_ROOT", s);
600 // Some LLVM linker flags (-L and -l) may be needed to link librustc_llvm.
601 if let Some(ref s) = builder.config.llvm_ldflags {
602 cargo.env("LLVM_LINKER_FLAGS", s);
604 // Building with a static libstdc++ is only supported on linux right now,
605 // not for MSVC or macOS
606 if builder.config.llvm_static_stdcpp
607 && !target.contains("freebsd")
608 && !target.contains("msvc")
609 && !target.contains("apple")
611 let file = compiler_file(builder, builder.cxx(target).unwrap(), target, "libstdc++.a");
612 cargo.env("LLVM_STATIC_STDCPP", file);
614 if builder.config.llvm_link_shared || builder.config.llvm_thin_lto {
615 cargo.env("LLVM_LINK_SHARED", "1");
617 if builder.config.llvm_use_libcxx {
618 cargo.env("LLVM_USE_LIBCXX", "1");
620 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
621 cargo.env("LLVM_NDEBUG", "1");
626 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
628 pub compiler: Compiler,
629 pub target_compiler: Compiler,
630 pub target: Interned<String>,
633 impl Step for RustcLink {
636 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
640 /// Same as `std_link`, only for librustc
641 fn run(self, builder: &Builder<'_>) {
642 let compiler = self.compiler;
643 let target_compiler = self.target_compiler;
644 let target = self.target;
645 builder.info(&format!(
646 "Copying stage{} rustc from stage{} ({} -> {} / {})",
647 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
651 &builder.sysroot_libdir(target_compiler, target),
652 &builder.sysroot_libdir(target_compiler, compiler.host),
653 &librustc_stamp(builder, compiler, target),
658 /// Cargo's output path for the standard library in a given stage, compiled
659 /// by a particular compiler for the specified target.
661 builder: &Builder<'_>,
663 target: Interned<String>,
665 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
668 /// Cargo's output path for librustc in a given stage, compiled by a particular
669 /// compiler for the specified target.
670 pub fn librustc_stamp(
671 builder: &Builder<'_>,
673 target: Interned<String>,
675 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
678 pub fn compiler_file(
679 builder: &Builder<'_>,
681 target: Interned<String>,
684 let mut cmd = Command::new(compiler);
685 cmd.args(builder.cflags(target, GitRepo::Rustc));
686 cmd.arg(format!("-print-file-name={}", file));
687 let out = output(&mut cmd);
688 PathBuf::from(out.trim())
691 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
693 pub compiler: Compiler,
696 impl Step for Sysroot {
697 type Output = Interned<PathBuf>;
699 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
703 /// Returns the sysroot for the `compiler` specified that *this build system
706 /// That is, the sysroot for the stage0 compiler is not what the compiler
707 /// thinks it is by default, but it's the same as the default for stages
709 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
710 let compiler = self.compiler;
711 let sysroot = if compiler.stage == 0 {
712 builder.out.join(&compiler.host).join("stage0-sysroot")
714 builder.out.join(&compiler.host).join(format!("stage{}", compiler.stage))
716 let _ = fs::remove_dir_all(&sysroot);
717 t!(fs::create_dir_all(&sysroot));
719 // Symlink the source root into the same location inside the sysroot,
720 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
721 // so that any tools relying on `rust-src` also work for local builds,
722 // and also for translating the virtual `/rustc/$hash` back to the real
723 // directory (for running tests with `rust.remap-debuginfo = true`).
724 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
725 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
726 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
727 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
729 "warning: creating symbolic link `{}` to `{}` failed with {}",
730 sysroot_lib_rustlib_src_rust.display(),
731 builder.src.display(),
734 if builder.config.rust_remap_debuginfo {
736 "warning: some `src/test/ui` tests will fail when lacking `{}`",
737 sysroot_lib_rustlib_src_rust.display(),
742 INTERNER.intern_path(sysroot)
746 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
747 pub struct Assemble {
748 /// The compiler which we will produce in this step. Assemble itself will
749 /// take care of ensuring that the necessary prerequisites to do so exist,
750 /// that is, this target can be a stage2 compiler and Assemble will build
751 /// previous stages for you.
752 pub target_compiler: Compiler,
755 impl Step for Assemble {
756 type Output = Compiler;
758 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
762 /// Prepare a new compiler from the artifacts in `stage`
764 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
765 /// must have been previously produced by the `stage - 1` builder.build
767 fn run(self, builder: &Builder<'_>) -> Compiler {
768 let target_compiler = self.target_compiler;
770 if target_compiler.stage == 0 {
772 builder.config.build, target_compiler.host,
773 "Cannot obtain compiler for non-native build triple at stage 0"
775 // The stage 0 compiler for the build triple is always pre-built.
776 return target_compiler;
779 // Get the compiler that we'll use to bootstrap ourselves.
781 // Note that this is where the recursive nature of the bootstrap
782 // happens, as this will request the previous stage's compiler on
783 // downwards to stage 0.
785 // Also note that we're building a compiler for the host platform. We
786 // only assume that we can run `build` artifacts, which means that to
787 // produce some other architecture compiler we need to start from
788 // `build` to get there.
790 // FIXME: Perhaps we should download those libraries?
791 // It would make builds faster...
793 // FIXME: It may be faster if we build just a stage 1 compiler and then
794 // use that to bootstrap this compiler forward.
795 let build_compiler = builder.compiler(target_compiler.stage - 1, builder.config.build);
797 // Build the libraries for this compiler to link to (i.e., the libraries
798 // it uses at runtime). NOTE: Crates the target compiler compiles don't
799 // link to these. (FIXME: Is that correct? It seems to be correct most
800 // of the time but I think we do link to these for stage2/bin compilers
801 // when not performing a full bootstrap).
802 builder.ensure(Rustc { compiler: build_compiler, target: target_compiler.host });
804 let lld_install = if builder.config.lld_enabled {
805 Some(builder.ensure(native::Lld { target: target_compiler.host }))
810 let stage = target_compiler.stage;
811 let host = target_compiler.host;
812 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
814 // Link in all dylibs to the libdir
815 let sysroot = builder.sysroot(target_compiler);
816 let rustc_libdir = builder.rustc_libdir(target_compiler);
817 t!(fs::create_dir_all(&rustc_libdir));
818 let src_libdir = builder.sysroot_libdir(build_compiler, host);
819 for f in builder.read_dir(&src_libdir) {
820 let filename = f.file_name().into_string().unwrap();
821 if is_dylib(&filename) {
822 builder.copy(&f.path(), &rustc_libdir.join(&filename));
826 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
827 if let Some(lld_install) = lld_install {
828 let src_exe = exe("lld", &target_compiler.host);
829 let dst_exe = exe("rust-lld", &target_compiler.host);
830 // we prepend this bin directory to the user PATH when linking Rust binaries. To
831 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
832 let dst = libdir.parent().unwrap().join("bin");
833 t!(fs::create_dir_all(&dst));
834 builder.copy(&lld_install.join("bin").join(&src_exe), &dst.join(&dst_exe));
837 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
838 // so that it can be found when the newly built `rustc` is run.
839 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
840 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
842 // Link the compiler binary itself into place
843 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
844 let rustc = out_dir.join(exe("rustc_binary", &*host));
845 let bindir = sysroot.join("bin");
846 t!(fs::create_dir_all(&bindir));
847 let compiler = builder.rustc(target_compiler);
848 builder.copy(&rustc, &compiler);
854 /// Link some files into a rustc sysroot.
856 /// For a particular stage this will link the file listed in `stamp` into the
857 /// `sysroot_dst` provided.
858 pub fn add_to_sysroot(
859 builder: &Builder<'_>,
861 sysroot_host_dst: &Path,
864 let self_contained_dst = &sysroot_dst.join("self-contained");
865 t!(fs::create_dir_all(&sysroot_dst));
866 t!(fs::create_dir_all(&sysroot_host_dst));
867 t!(fs::create_dir_all(&self_contained_dst));
868 for (path, dependency_type) in builder.read_stamp_file(stamp) {
869 let dst = match dependency_type {
870 DependencyType::Host => sysroot_host_dst,
871 DependencyType::Target => sysroot_dst,
872 DependencyType::TargetSelfContained => self_contained_dst,
874 builder.copy(&path, &dst.join(path.file_name().unwrap()));
879 builder: &Builder<'_>,
881 tail_args: Vec<String>,
883 additional_target_deps: Vec<(PathBuf, DependencyType)>,
886 if builder.config.dry_run {
890 // `target_root_dir` looks like $dir/$target/release
891 let target_root_dir = stamp.parent().unwrap();
892 // `target_deps_dir` looks like $dir/$target/release/deps
893 let target_deps_dir = target_root_dir.join("deps");
894 // `host_root_dir` looks like $dir/release
895 let host_root_dir = target_root_dir
897 .unwrap() // chop off `release`
899 .unwrap() // chop off `$target`
900 .join(target_root_dir.file_name().unwrap());
902 // Spawn Cargo slurping up its JSON output. We'll start building up the
903 // `deps` array of all files it generated along with a `toplevel` array of
904 // files we need to probe for later.
905 let mut deps = Vec::new();
906 let mut toplevel = Vec::new();
907 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
908 let (filenames, crate_types) = match msg {
909 CargoMessage::CompilerArtifact {
911 target: CargoTarget { crate_types },
913 } => (filenames, crate_types),
916 for filename in filenames {
917 // Skip files like executables
918 if !(filename.ends_with(".rlib")
919 || filename.ends_with(".lib")
920 || filename.ends_with(".a")
921 || is_dylib(&filename)
922 || (is_check && filename.ends_with(".rmeta")))
927 let filename = Path::new(&*filename);
929 // If this was an output file in the "host dir" we don't actually
930 // worry about it, it's not relevant for us
931 if filename.starts_with(&host_root_dir) {
932 // Unless it's a proc macro used in the compiler
933 if crate_types.iter().any(|t| t == "proc-macro") {
934 deps.push((filename.to_path_buf(), DependencyType::Host));
939 // If this was output in the `deps` dir then this is a precise file
940 // name (hash included) so we start tracking it.
941 if filename.starts_with(&target_deps_dir) {
942 deps.push((filename.to_path_buf(), DependencyType::Target));
946 // Otherwise this was a "top level artifact" which right now doesn't
947 // have a hash in the name, but there's a version of this file in
948 // the `deps` folder which *does* have a hash in the name. That's
949 // the one we'll want to we'll probe for it later.
951 // We do not use `Path::file_stem` or `Path::extension` here,
952 // because some generated files may have multiple extensions e.g.
953 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
954 // split the file name by the last extension (`.lib`) while we need
955 // to split by all extensions (`.dll.lib`).
956 let expected_len = t!(filename.metadata()).len();
957 let filename = filename.file_name().unwrap().to_str().unwrap();
958 let mut parts = filename.splitn(2, '.');
959 let file_stem = parts.next().unwrap().to_owned();
960 let extension = parts.next().unwrap().to_owned();
962 toplevel.push((file_stem, extension, expected_len));
970 // Ok now we need to actually find all the files listed in `toplevel`. We've
971 // got a list of prefix/extensions and we basically just need to find the
972 // most recent file in the `deps` folder corresponding to each one.
973 let contents = t!(target_deps_dir.read_dir())
975 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
976 .collect::<Vec<_>>();
977 for (prefix, extension, expected_len) in toplevel {
978 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
979 filename.starts_with(&prefix[..])
980 && filename[prefix.len()..].starts_with('-')
981 && filename.ends_with(&extension[..])
982 && meta.len() == expected_len
985 .max_by_key(|&&(_, _, ref metadata)| FileTime::from_last_modification_time(metadata));
986 let path_to_add = match max {
987 Some(triple) => triple.0.to_str().unwrap(),
988 None => panic!("no output generated for {:?} {:?}", prefix, extension),
990 if is_dylib(path_to_add) {
991 let candidate = format!("{}.lib", path_to_add);
992 let candidate = PathBuf::from(candidate);
993 if candidate.exists() {
994 deps.push((candidate, DependencyType::Target));
997 deps.push((path_to_add.into(), DependencyType::Target));
1000 deps.extend(additional_target_deps);
1002 let mut new_contents = Vec::new();
1003 for (dep, dependency_type) in deps.iter() {
1004 new_contents.extend(match *dependency_type {
1005 DependencyType::Host => b"h",
1006 DependencyType::Target => b"t",
1007 DependencyType::TargetSelfContained => b"s",
1009 new_contents.extend(dep.to_str().unwrap().as_bytes());
1010 new_contents.extend(b"\0");
1012 t!(fs::write(&stamp, &new_contents));
1013 deps.into_iter().map(|(d, _)| d).collect()
1016 pub fn stream_cargo(
1017 builder: &Builder<'_>,
1019 tail_args: Vec<String>,
1020 cb: &mut dyn FnMut(CargoMessage<'_>),
1022 let mut cargo = Command::from(cargo);
1023 if builder.config.dry_run {
1026 // Instruct Cargo to give us json messages on stdout, critically leaving
1027 // stderr as piped so we can get those pretty colors.
1028 let mut message_format = if builder.config.json_output {
1029 String::from("json")
1031 String::from("json-render-diagnostics")
1033 if let Some(s) = &builder.config.rustc_error_format {
1034 message_format.push_str(",json-diagnostic-");
1035 message_format.push_str(s);
1037 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1039 for arg in tail_args {
1043 builder.verbose(&format!("running: {:?}", cargo));
1044 let mut child = match cargo.spawn() {
1046 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1049 // Spawn Cargo slurping up its JSON output. We'll start building up the
1050 // `deps` array of all files it generated along with a `toplevel` array of
1051 // files we need to probe for later.
1052 let stdout = BufReader::new(child.stdout.take().unwrap());
1053 for line in stdout.lines() {
1054 let line = t!(line);
1055 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1057 if builder.config.json_output {
1058 // Forward JSON to stdout.
1059 println!("{}", line);
1063 // If this was informational, just print it out and continue
1064 Err(_) => println!("{}", line),
1068 // Make sure Cargo actually succeeded after we read all of its stdout.
1069 let status = t!(child.wait());
1070 if !status.success() {
1072 "command did not execute successfully: {:?}\n\
1073 expected success, got: {}",
1080 #[derive(Deserialize)]
1081 pub struct CargoTarget<'a> {
1082 crate_types: Vec<Cow<'a, str>>,
1085 #[derive(Deserialize)]
1086 #[serde(tag = "reason", rename_all = "kebab-case")]
1087 pub enum CargoMessage<'a> {
1089 package_id: Cow<'a, str>,
1090 features: Vec<Cow<'a, str>>,
1091 filenames: Vec<Cow<'a, str>>,
1092 target: CargoTarget<'a>,
1094 BuildScriptExecuted {
1095 package_id: Cow<'a, str>,