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.
10 use std::collections::HashSet;
13 use std::io::prelude::*;
14 use std::io::BufReader;
15 use std::path::{Path, PathBuf};
16 use std::process::{exit, Command, Stdio};
19 use build_helper::{output, t, up_to_date};
20 use filetime::FileTime;
21 use serde::Deserialize;
23 use crate::builder::Cargo;
24 use crate::builder::{Builder, Kind, RunConfig, ShouldRun, Step};
25 use crate::cache::{Interned, INTERNER};
26 use crate::config::TargetSelection;
29 use crate::tool::SourceType;
30 use crate::util::{exe, is_dylib, symlink_dir};
31 use crate::{Compiler, DependencyType, GitRepo, Mode};
33 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
35 pub target: TargetSelection,
36 pub compiler: Compiler,
41 const DEFAULT: bool = true;
43 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
44 run.all_krates("test")
47 fn make_run(run: RunConfig<'_>) {
48 run.builder.ensure(Std {
49 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
54 /// Builds the standard library.
56 /// This will build the standard library for a particular stage of the build
57 /// using the `compiler` targeting the `target` architecture. The artifacts
58 /// created will also be linked into the sysroot directory.
59 fn run(self, builder: &Builder<'_>) {
60 let target = self.target;
61 let compiler = self.compiler;
63 if builder.config.keep_stage.contains(&compiler.stage)
64 || builder.config.keep_stage_std.contains(&compiler.stage)
66 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
67 builder.ensure(StdLink { compiler, target_compiler: compiler, target });
71 let mut target_deps = builder.ensure(StartupObjects { compiler, target });
73 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
74 if compiler_to_use != compiler {
75 builder.ensure(Std { compiler: compiler_to_use, target });
76 builder.info(&format!("Uplifting stage1 std ({} -> {})", compiler_to_use.host, target));
78 // Even if we're not building std this stage, the new sysroot must
79 // still contain the third party objects needed by various targets.
80 copy_third_party_objects(builder, &compiler, target);
81 copy_self_contained_objects(builder, &compiler, target);
83 builder.ensure(StdLink {
84 compiler: compiler_to_use,
85 target_compiler: compiler,
91 target_deps.extend(copy_third_party_objects(builder, &compiler, target));
92 target_deps.extend(copy_self_contained_objects(builder, &compiler, target));
94 let mut cargo = builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "build");
95 std_cargo(builder, target, compiler.stage, &mut cargo);
97 builder.info(&format!(
98 "Building stage{} std artifacts ({} -> {})",
99 compiler.stage, &compiler.host, target
105 &libstd_stamp(builder, compiler, target),
110 builder.ensure(StdLink {
111 compiler: builder.compiler(compiler.stage, builder.config.build),
112 target_compiler: compiler,
119 builder: &Builder<'_>,
123 target_deps: &mut Vec<(PathBuf, DependencyType)>,
124 dependency_type: DependencyType,
126 let target = libdir.join(name);
127 builder.copy(&sourcedir.join(name), &target);
129 target_deps.push((target, dependency_type));
132 /// Copies third party objects needed by various targets.
133 fn copy_third_party_objects(
134 builder: &Builder<'_>,
136 target: TargetSelection,
137 ) -> Vec<(PathBuf, DependencyType)> {
138 let mut target_deps = vec![];
140 // FIXME: remove this in 2021
141 if target == "x86_64-fortanix-unknown-sgx" {
142 if env::var_os("X86_FORTANIX_SGX_LIBS").is_some() {
143 builder.info("Warning: X86_FORTANIX_SGX_LIBS environment variable is ignored, libunwind is now compiled as part of rustbuild");
147 if builder.config.sanitizers_enabled(target) && compiler.stage != 0 {
148 // The sanitizers are only copied in stage1 or above,
149 // to avoid creating dependency on LLVM.
151 copy_sanitizers(builder, &compiler, target)
153 .map(|d| (d, DependencyType::Target)),
160 /// Copies third party objects needed by various targets for self-contained linkage.
161 fn copy_self_contained_objects(
162 builder: &Builder<'_>,
164 target: TargetSelection,
165 ) -> Vec<(PathBuf, DependencyType)> {
166 let libdir_self_contained = builder.sysroot_libdir(*compiler, target).join("self-contained");
167 t!(fs::create_dir_all(&libdir_self_contained));
168 let mut target_deps = vec![];
170 // Copies the CRT objects.
172 // rustc historically provides a more self-contained installation for musl targets
173 // not requiring the presence of a native musl toolchain. For example, it can fall back
174 // to using gcc from a glibc-targeting toolchain for linking.
175 // To do that we have to distribute musl startup objects as a part of Rust toolchain
176 // and link with them manually in the self-contained mode.
177 if target.contains("musl") {
178 let srcdir = builder.musl_libdir(target).unwrap();
179 for &obj in &["crt1.o", "Scrt1.o", "rcrt1.o", "crti.o", "crtn.o"] {
182 &libdir_self_contained,
186 DependencyType::TargetSelfContained,
189 } else if target.ends_with("-wasi") {
190 let srcdir = builder.wasi_root(target).unwrap().join("lib/wasm32-wasi");
193 &libdir_self_contained,
197 DependencyType::TargetSelfContained,
199 } else if target.contains("windows-gnu") {
200 for obj in ["crt2.o", "dllcrt2.o"].iter() {
201 let src = compiler_file(builder, builder.cc(target), target, obj);
202 let target = libdir_self_contained.join(obj);
203 builder.copy(&src, &target);
204 target_deps.push((target, DependencyType::TargetSelfContained));
211 /// Configure cargo to compile the standard library, adding appropriate env vars
213 pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, cargo: &mut Cargo) {
214 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
215 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
218 // Determine if we're going to compile in optimized C intrinsics to
219 // the `compiler-builtins` crate. These intrinsics live in LLVM's
220 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
221 // always checked out, so we need to conditionally look for this. (e.g. if
222 // an external LLVM is used we skip the LLVM submodule checkout).
224 // Note that this shouldn't affect the correctness of `compiler-builtins`,
225 // but only its speed. Some intrinsics in C haven't been translated to Rust
226 // yet but that's pretty rare. Other intrinsics have optimized
227 // implementations in C which have only had slower versions ported to Rust,
228 // so we favor the C version where we can, but it's not critical.
230 // If `compiler-rt` is available ensure that the `c` feature of the
231 // `compiler-builtins` crate is enabled and it's configured to learn where
232 // `compiler-rt` is located.
233 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
234 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
235 // Note that `libprofiler_builtins/build.rs` also computes this so if
236 // you're changing something here please also change that.
237 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
238 " compiler-builtins-c"
243 if builder.no_std(target) == Some(true) {
244 let mut features = "compiler-builtins-mem".to_string();
245 features.push_str(compiler_builtins_c_feature);
247 // for no-std targets we only compile a few no_std crates
249 .args(&["-p", "alloc"])
250 .arg("--manifest-path")
251 .arg(builder.src.join("library/alloc/Cargo.toml"))
255 let mut features = builder.std_features(target);
256 features.push_str(compiler_builtins_c_feature);
261 .arg("--manifest-path")
262 .arg(builder.src.join("library/test/Cargo.toml"));
264 // Help the libc crate compile by assisting it in finding various
265 // sysroot native libraries.
266 if target.contains("musl") {
267 if let Some(p) = builder.musl_libdir(target) {
268 let root = format!("native={}", p.to_str().unwrap());
269 cargo.rustflag("-L").rustflag(&root);
273 if target.ends_with("-wasi") {
274 if let Some(p) = builder.wasi_root(target) {
275 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
276 cargo.rustflag("-L").rustflag(&root);
281 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
282 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
283 // built with bitcode so that the produced rlibs can be used for both LTO
284 // builds (which use bitcode) and non-LTO builds (which use object code).
285 // So we override the override here!
287 // But we don't bother for the stage 0 compiler because it's never used
290 cargo.rustflag("-Cembed-bitcode=yes");
293 // By default, rustc does not include unwind tables unless they are required
294 // for a particular target. They are not required by RISC-V targets, but
295 // compiling the standard library with them means that users can get
296 // backtraces without having to recompile the standard library themselves.
298 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
299 if target.contains("riscv") {
300 cargo.rustflag("-Cforce-unwind-tables=yes");
304 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
306 pub compiler: Compiler,
307 pub target_compiler: Compiler,
308 pub target: TargetSelection,
311 impl Step for StdLink {
314 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
318 /// Link all libstd rlibs/dylibs into the sysroot location.
320 /// Links those artifacts generated by `compiler` to the `stage` compiler's
321 /// sysroot for the specified `host` and `target`.
323 /// Note that this assumes that `compiler` has already generated the libstd
324 /// libraries for `target`, and this method will find them in the relevant
325 /// output directory.
326 fn run(self, builder: &Builder<'_>) {
327 let compiler = self.compiler;
328 let target_compiler = self.target_compiler;
329 let target = self.target;
330 builder.info(&format!(
331 "Copying stage{} std from stage{} ({} -> {} / {})",
332 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
334 let libdir = builder.sysroot_libdir(target_compiler, target);
335 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
336 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
340 /// Copies sanitizer runtime libraries into target libdir.
342 builder: &Builder<'_>,
344 target: TargetSelection,
346 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
348 if builder.config.dry_run {
352 let mut target_deps = Vec::new();
353 let libdir = builder.sysroot_libdir(*compiler, target);
355 for runtime in &runtimes {
356 let dst = libdir.join(&runtime.name);
357 builder.copy(&runtime.path, &dst);
359 if target == "x86_64-apple-darwin" {
360 // Update the library install name reflect the fact it has been renamed.
361 let status = Command::new("install_name_tool")
363 .arg(format!("@rpath/{}", runtime.name))
366 .expect("failed to execute `install_name_tool`");
367 assert!(status.success());
370 target_deps.push(dst);
376 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
377 pub struct StartupObjects {
378 pub compiler: Compiler,
379 pub target: TargetSelection,
382 impl Step for StartupObjects {
383 type Output = Vec<(PathBuf, DependencyType)>;
385 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
386 run.path("library/rtstartup")
389 fn make_run(run: RunConfig<'_>) {
390 run.builder.ensure(StartupObjects {
391 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
396 /// Builds and prepare startup objects like rsbegin.o and rsend.o
398 /// These are primarily used on Windows right now for linking executables/dlls.
399 /// They don't require any library support as they're just plain old object
400 /// files, so we just use the nightly snapshot compiler to always build them (as
401 /// no other compilers are guaranteed to be available).
402 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
403 let for_compiler = self.compiler;
404 let target = self.target;
405 if !target.contains("windows-gnu") {
409 let mut target_deps = vec![];
411 let src_dir = &builder.src.join("library").join("rtstartup");
412 let dst_dir = &builder.native_dir(target).join("rtstartup");
413 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
414 t!(fs::create_dir_all(dst_dir));
416 for file in &["rsbegin", "rsend"] {
417 let src_file = &src_dir.join(file.to_string() + ".rs");
418 let dst_file = &dst_dir.join(file.to_string() + ".o");
419 if !up_to_date(src_file, dst_file) {
420 let mut cmd = Command::new(&builder.initial_rustc);
422 cmd.env("RUSTC_BOOTSTRAP", "1")
426 .arg(target.rustc_target_arg())
434 let target = sysroot_dir.join((*file).to_string() + ".o");
435 builder.copy(dst_file, &target);
436 target_deps.push((target, DependencyType::Target));
443 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
445 pub target: TargetSelection,
446 pub compiler: Compiler,
449 impl Step for Rustc {
451 const ONLY_HOSTS: bool = true;
452 const DEFAULT: bool = false;
454 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
455 run.path("compiler/rustc")
458 fn make_run(run: RunConfig<'_>) {
459 run.builder.ensure(Rustc {
460 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
465 /// Builds the compiler.
467 /// This will build the compiler for a particular stage of the build using
468 /// the `compiler` targeting the `target` architecture. The artifacts
469 /// created will also be linked into the sysroot directory.
470 fn run(self, builder: &Builder<'_>) {
471 let compiler = self.compiler;
472 let target = self.target;
474 builder.ensure(Std { compiler, target });
476 if builder.config.keep_stage.contains(&compiler.stage) {
477 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
478 builder.info("Warning: Use `--keep-stage-std` if you want to rebuild the compiler when it changes");
479 builder.ensure(RustcLink { compiler, target_compiler: compiler, target });
483 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
484 if compiler_to_use != compiler {
485 builder.ensure(Rustc { compiler: compiler_to_use, target });
487 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
488 builder.ensure(RustcLink {
489 compiler: compiler_to_use,
490 target_compiler: compiler,
496 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
498 compiler: builder.compiler(self.compiler.stage, builder.config.build),
499 target: builder.config.build,
502 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "build");
503 rustc_cargo(builder, &mut cargo, target);
505 if builder.config.rust_profile_use.is_some()
506 && builder.config.rust_profile_generate.is_some()
508 panic!("Cannot use and generate PGO profiles at the same time");
511 let is_collecting = if let Some(path) = &builder.config.rust_profile_generate {
512 if compiler.stage == 1 {
513 cargo.rustflag(&format!("-Cprofile-generate={}", path));
514 // Apparently necessary to avoid overflowing the counters during
515 // a Cargo build profile
516 cargo.rustflag("-Cllvm-args=-vp-counters-per-site=4");
521 } else if let Some(path) = &builder.config.rust_profile_use {
522 if compiler.stage == 1 {
523 cargo.rustflag(&format!("-Cprofile-use={}", path));
524 cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
533 // Ensure paths to Rust sources are relative, not absolute.
534 cargo.rustflag(&format!(
535 "-Cllvm-args=-static-func-strip-dirname-prefix={}",
536 builder.config.src.components().count()
540 builder.info(&format!(
541 "Building stage{} compiler artifacts ({} -> {})",
542 compiler.stage, &compiler.host, target
548 &librustc_stamp(builder, compiler, target),
553 builder.ensure(RustcLink {
554 compiler: builder.compiler(compiler.stage, builder.config.build),
555 target_compiler: compiler,
561 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
564 .arg(builder.rustc_features())
565 .arg("--manifest-path")
566 .arg(builder.src.join("compiler/rustc/Cargo.toml"));
567 rustc_cargo_env(builder, cargo, target);
570 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
571 // Set some configuration variables picked up by build scripts and
572 // the compiler alike
574 .env("CFG_RELEASE", builder.rust_release())
575 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
576 .env("CFG_VERSION", builder.rust_version())
577 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default());
579 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
580 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
582 if let Some(ref ver_date) = builder.rust_info.commit_date() {
583 cargo.env("CFG_VER_DATE", ver_date);
585 if let Some(ref ver_hash) = builder.rust_info.sha() {
586 cargo.env("CFG_VER_HASH", ver_hash);
588 if !builder.unstable_features() {
589 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
591 if let Some(ref s) = builder.config.rustc_default_linker {
592 cargo.env("CFG_DEFAULT_LINKER", s);
594 if builder.config.rustc_parallel {
595 cargo.rustflag("--cfg=parallel_compiler");
597 if builder.config.rust_verify_llvm_ir {
598 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
601 // Pass down configuration from the LLVM build into the build of
602 // rustc_llvm and rustc_codegen_llvm.
604 // Note that this is disabled if LLVM itself is disabled or we're in a check
605 // build. If we are in a check build we still go ahead here presuming we've
606 // detected that LLVM is alreay built and good to go which helps prevent
607 // busting caches (e.g. like #71152).
608 if builder.config.llvm_enabled()
609 && (builder.kind != Kind::Check
610 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
612 if builder.is_rust_llvm(target) {
613 cargo.env("LLVM_RUSTLLVM", "1");
615 let llvm_config = builder.ensure(native::Llvm { target });
616 cargo.env("LLVM_CONFIG", &llvm_config);
617 let target_config = builder.config.target_config.get(&target);
618 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
619 cargo.env("CFG_LLVM_ROOT", s);
621 // Some LLVM linker flags (-L and -l) may be needed to link rustc_llvm.
622 if let Some(ref s) = builder.config.llvm_ldflags {
623 cargo.env("LLVM_LINKER_FLAGS", s);
625 // Building with a static libstdc++ is only supported on linux right now,
626 // not for MSVC or macOS
627 if builder.config.llvm_static_stdcpp
628 && !target.contains("freebsd")
629 && !target.contains("msvc")
630 && !target.contains("apple")
632 let file = compiler_file(builder, builder.cxx(target).unwrap(), target, "libstdc++.a");
633 cargo.env("LLVM_STATIC_STDCPP", file);
635 if builder.config.llvm_link_shared {
636 cargo.env("LLVM_LINK_SHARED", "1");
638 if builder.config.llvm_use_libcxx {
639 cargo.env("LLVM_USE_LIBCXX", "1");
641 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
642 cargo.env("LLVM_NDEBUG", "1");
647 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
649 pub compiler: Compiler,
650 pub target_compiler: Compiler,
651 pub target: TargetSelection,
654 impl Step for RustcLink {
657 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
661 /// Same as `std_link`, only for librustc
662 fn run(self, builder: &Builder<'_>) {
663 let compiler = self.compiler;
664 let target_compiler = self.target_compiler;
665 let target = self.target;
666 builder.info(&format!(
667 "Copying stage{} rustc from stage{} ({} -> {} / {})",
668 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
672 &builder.sysroot_libdir(target_compiler, target),
673 &builder.sysroot_libdir(target_compiler, compiler.host),
674 &librustc_stamp(builder, compiler, target),
679 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
680 pub struct CodegenBackend {
681 pub target: TargetSelection,
682 pub compiler: Compiler,
683 pub backend: Interned<String>,
686 impl Step for CodegenBackend {
688 const ONLY_HOSTS: bool = true;
689 // Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
690 const DEFAULT: bool = true;
692 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
693 run.path("compiler/rustc_codegen_cranelift")
696 fn make_run(run: RunConfig<'_>) {
697 for &backend in &run.builder.config.rust_codegen_backends {
698 if backend == "llvm" {
699 continue; // Already built as part of rustc
702 run.builder.ensure(CodegenBackend {
704 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
710 fn run(self, builder: &Builder<'_>) {
711 let compiler = self.compiler;
712 let target = self.target;
713 let backend = self.backend;
715 builder.ensure(Rustc { compiler, target });
717 if builder.config.keep_stage.contains(&compiler.stage) {
719 "Warning: Using a potentially old codegen backend. \
720 This may not behave well.",
722 // Codegen backends are linked separately from this step today, so we don't do
727 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
728 if compiler_to_use != compiler {
729 builder.ensure(CodegenBackend { compiler: compiler_to_use, target, backend });
733 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
736 builder.cargo(compiler, Mode::Codegen, SourceType::Submodule, target, "build");
738 .arg("--manifest-path")
739 .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));
740 rustc_cargo_env(builder, &mut cargo, target);
742 let tmp_stamp = out_dir.join(".tmp.stamp");
744 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false);
745 if builder.config.dry_run {
748 let mut files = files.into_iter().filter(|f| {
749 let filename = f.file_name().unwrap().to_str().unwrap();
750 is_dylib(filename) && filename.contains("rustc_codegen_")
752 let codegen_backend = match files.next() {
754 None => panic!("no dylibs built for codegen backend?"),
756 if let Some(f) = files.next() {
758 "codegen backend built two dylibs:\n{}\n{}",
759 codegen_backend.display(),
763 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
764 let codegen_backend = codegen_backend.to_str().unwrap();
765 t!(fs::write(&stamp, &codegen_backend));
769 /// Creates the `codegen-backends` folder for a compiler that's about to be
770 /// assembled as a complete compiler.
772 /// This will take the codegen artifacts produced by `compiler` and link them
773 /// into an appropriate location for `target_compiler` to be a functional
775 fn copy_codegen_backends_to_sysroot(
776 builder: &Builder<'_>,
778 target_compiler: Compiler,
780 let target = target_compiler.host;
782 // Note that this step is different than all the other `*Link` steps in
783 // that it's not assembling a bunch of libraries but rather is primarily
784 // moving the codegen backend into place. The codegen backend of rustc is
785 // not linked into the main compiler by default but is rather dynamically
786 // selected at runtime for inclusion.
788 // Here we're looking for the output dylib of the `CodegenBackend` step and
789 // we're copying that into the `codegen-backends` folder.
790 let dst = builder.sysroot_codegen_backends(target_compiler);
791 t!(fs::create_dir_all(&dst), dst);
793 if builder.config.dry_run {
797 for backend in builder.config.rust_codegen_backends.iter() {
798 if backend == "llvm" {
799 continue; // Already built as part of rustc
802 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
803 let dylib = t!(fs::read_to_string(&stamp));
804 let file = Path::new(&dylib);
805 let filename = file.file_name().unwrap().to_str().unwrap();
806 // change `librustc_codegen_cranelift-xxxxxx.so` to
807 // `librustc_codegen_cranelift-release.so`
808 let target_filename = {
809 let dash = filename.find('-').unwrap();
810 let dot = filename.find('.').unwrap();
811 format!("{}-{}{}", &filename[..dash], builder.rust_release(), &filename[dot..])
813 builder.copy(&file, &dst.join(target_filename));
817 /// Cargo's output path for the standard library in a given stage, compiled
818 /// by a particular compiler for the specified target.
819 pub fn libstd_stamp(builder: &Builder<'_>, compiler: Compiler, target: TargetSelection) -> PathBuf {
820 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
823 /// Cargo's output path for librustc in a given stage, compiled by a particular
824 /// compiler for the specified target.
825 pub fn librustc_stamp(
826 builder: &Builder<'_>,
828 target: TargetSelection,
830 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
833 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
834 /// compiler for the specified target and backend.
835 fn codegen_backend_stamp(
836 builder: &Builder<'_>,
838 target: TargetSelection,
839 backend: Interned<String>,
842 .cargo_out(compiler, Mode::Codegen, target)
843 .join(format!(".librustc_codegen_{}.stamp", backend))
846 pub fn compiler_file(
847 builder: &Builder<'_>,
849 target: TargetSelection,
852 let mut cmd = Command::new(compiler);
853 cmd.args(builder.cflags(target, GitRepo::Rustc));
854 cmd.arg(format!("-print-file-name={}", file));
855 let out = output(&mut cmd);
856 PathBuf::from(out.trim())
859 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
861 pub compiler: Compiler,
864 impl Step for Sysroot {
865 type Output = Interned<PathBuf>;
867 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
871 /// Returns the sysroot for the `compiler` specified that *this build system
874 /// That is, the sysroot for the stage0 compiler is not what the compiler
875 /// thinks it is by default, but it's the same as the default for stages
877 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
878 let compiler = self.compiler;
879 let sysroot = if compiler.stage == 0 {
880 builder.out.join(&compiler.host.triple).join("stage0-sysroot")
882 builder.out.join(&compiler.host.triple).join(format!("stage{}", compiler.stage))
884 let _ = fs::remove_dir_all(&sysroot);
885 t!(fs::create_dir_all(&sysroot));
887 // Symlink the source root into the same location inside the sysroot,
888 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
889 // so that any tools relying on `rust-src` also work for local builds,
890 // and also for translating the virtual `/rustc/$hash` back to the real
891 // directory (for running tests with `rust.remap-debuginfo = true`).
892 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
893 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
894 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
895 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
897 "warning: creating symbolic link `{}` to `{}` failed with {}",
898 sysroot_lib_rustlib_src_rust.display(),
899 builder.src.display(),
902 if builder.config.rust_remap_debuginfo {
904 "warning: some `src/test/ui` tests will fail when lacking `{}`",
905 sysroot_lib_rustlib_src_rust.display(),
910 INTERNER.intern_path(sysroot)
914 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
915 pub struct Assemble {
916 /// The compiler which we will produce in this step. Assemble itself will
917 /// take care of ensuring that the necessary prerequisites to do so exist,
918 /// that is, this target can be a stage2 compiler and Assemble will build
919 /// previous stages for you.
920 pub target_compiler: Compiler,
923 impl Step for Assemble {
924 type Output = Compiler;
926 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
930 /// Prepare a new compiler from the artifacts in `stage`
932 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
933 /// must have been previously produced by the `stage - 1` builder.build
935 fn run(self, builder: &Builder<'_>) -> Compiler {
936 let target_compiler = self.target_compiler;
938 if target_compiler.stage == 0 {
940 builder.config.build, target_compiler.host,
941 "Cannot obtain compiler for non-native build triple at stage 0"
943 // The stage 0 compiler for the build triple is always pre-built.
944 return target_compiler;
947 // Get the compiler that we'll use to bootstrap ourselves.
949 // Note that this is where the recursive nature of the bootstrap
950 // happens, as this will request the previous stage's compiler on
951 // downwards to stage 0.
953 // Also note that we're building a compiler for the host platform. We
954 // only assume that we can run `build` artifacts, which means that to
955 // produce some other architecture compiler we need to start from
956 // `build` to get there.
958 // FIXME: Perhaps we should download those libraries?
959 // It would make builds faster...
961 // FIXME: It may be faster if we build just a stage 1 compiler and then
962 // use that to bootstrap this compiler forward.
963 let build_compiler = 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 { compiler: build_compiler, target: target_compiler.host });
972 for &backend in builder.config.rust_codegen_backends.iter() {
973 if backend == "llvm" {
974 continue; // Already built as part of rustc
977 builder.ensure(CodegenBackend {
978 compiler: build_compiler,
979 target: target_compiler.host,
984 let lld_install = if builder.config.lld_enabled {
985 Some(builder.ensure(native::Lld { 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 stamp = librustc_stamp(builder, build_compiler, target_compiler.host);
996 let proc_macros = builder
997 .read_stamp_file(&stamp)
999 .filter_map(|(path, dependency_type)| {
1000 if dependency_type == DependencyType::Host {
1001 Some(path.file_name().unwrap().to_owned().into_string().unwrap())
1006 .collect::<HashSet<_>>();
1008 let sysroot = builder.sysroot(target_compiler);
1009 let rustc_libdir = builder.rustc_libdir(target_compiler);
1010 t!(fs::create_dir_all(&rustc_libdir));
1011 let src_libdir = builder.sysroot_libdir(build_compiler, host);
1012 for f in builder.read_dir(&src_libdir) {
1013 let filename = f.file_name().into_string().unwrap();
1014 if is_dylib(&filename) && !proc_macros.contains(&filename) {
1015 builder.copy(&f.path(), &rustc_libdir.join(&filename));
1019 copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
1021 // We prepend this bin directory to the user PATH when linking Rust binaries. To
1022 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
1023 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
1024 let libdir_bin = libdir.parent().unwrap().join("bin");
1025 t!(fs::create_dir_all(&libdir_bin));
1027 if let Some(lld_install) = lld_install {
1028 let src_exe = exe("lld", target_compiler.host);
1029 let dst_exe = exe("rust-lld", target_compiler.host);
1030 builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
1033 // Similarly, copy `llvm-dwp` into libdir for Split DWARF.
1035 let src_exe = exe("llvm-dwp", target_compiler.host);
1036 let dst_exe = exe("rust-llvm-dwp", target_compiler.host);
1037 let llvm_config_bin = builder.ensure(native::Llvm { target: target_compiler.host });
1038 let llvm_bin_dir = llvm_config_bin.parent().unwrap();
1039 builder.copy(&llvm_bin_dir.join(&src_exe), &libdir_bin.join(&dst_exe));
1042 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
1043 // so that it can be found when the newly built `rustc` is run.
1044 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
1045 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
1047 // Link the compiler binary itself into place
1048 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1049 let rustc = out_dir.join(exe("rustc-main", host));
1050 let bindir = sysroot.join("bin");
1051 t!(fs::create_dir_all(&bindir));
1052 let compiler = builder.rustc(target_compiler);
1053 builder.copy(&rustc, &compiler);
1059 /// Link some files into a rustc sysroot.
1061 /// For a particular stage this will link the file listed in `stamp` into the
1062 /// `sysroot_dst` provided.
1063 pub fn add_to_sysroot(
1064 builder: &Builder<'_>,
1066 sysroot_host_dst: &Path,
1069 let self_contained_dst = &sysroot_dst.join("self-contained");
1070 t!(fs::create_dir_all(&sysroot_dst));
1071 t!(fs::create_dir_all(&sysroot_host_dst));
1072 t!(fs::create_dir_all(&self_contained_dst));
1073 for (path, dependency_type) in builder.read_stamp_file(stamp) {
1074 let dst = match dependency_type {
1075 DependencyType::Host => sysroot_host_dst,
1076 DependencyType::Target => sysroot_dst,
1077 DependencyType::TargetSelfContained => self_contained_dst,
1079 builder.copy(&path, &dst.join(path.file_name().unwrap()));
1084 builder: &Builder<'_>,
1086 tail_args: Vec<String>,
1088 additional_target_deps: Vec<(PathBuf, DependencyType)>,
1091 if builder.config.dry_run {
1095 // `target_root_dir` looks like $dir/$target/release
1096 let target_root_dir = stamp.parent().unwrap();
1097 // `target_deps_dir` looks like $dir/$target/release/deps
1098 let target_deps_dir = target_root_dir.join("deps");
1099 // `host_root_dir` looks like $dir/release
1100 let host_root_dir = target_root_dir
1102 .unwrap() // chop off `release`
1104 .unwrap() // chop off `$target`
1105 .join(target_root_dir.file_name().unwrap());
1107 // Spawn Cargo slurping up its JSON output. We'll start building up the
1108 // `deps` array of all files it generated along with a `toplevel` array of
1109 // files we need to probe for later.
1110 let mut deps = Vec::new();
1111 let mut toplevel = Vec::new();
1112 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1113 let (filenames, crate_types) = match msg {
1114 CargoMessage::CompilerArtifact {
1116 target: CargoTarget { crate_types },
1118 } => (filenames, crate_types),
1121 for filename in filenames {
1122 // Skip files like executables
1123 if !(filename.ends_with(".rlib")
1124 || filename.ends_with(".lib")
1125 || filename.ends_with(".a")
1126 || is_dylib(&filename)
1127 || (is_check && filename.ends_with(".rmeta")))
1132 let filename = Path::new(&*filename);
1134 // If this was an output file in the "host dir" we don't actually
1135 // worry about it, it's not relevant for us
1136 if filename.starts_with(&host_root_dir) {
1137 // Unless it's a proc macro used in the compiler
1138 if crate_types.iter().any(|t| t == "proc-macro") {
1139 deps.push((filename.to_path_buf(), DependencyType::Host));
1144 // If this was output in the `deps` dir then this is a precise file
1145 // name (hash included) so we start tracking it.
1146 if filename.starts_with(&target_deps_dir) {
1147 deps.push((filename.to_path_buf(), DependencyType::Target));
1151 // Otherwise this was a "top level artifact" which right now doesn't
1152 // have a hash in the name, but there's a version of this file in
1153 // the `deps` folder which *does* have a hash in the name. That's
1154 // the one we'll want to we'll probe for it later.
1156 // We do not use `Path::file_stem` or `Path::extension` here,
1157 // because some generated files may have multiple extensions e.g.
1158 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1159 // split the file name by the last extension (`.lib`) while we need
1160 // to split by all extensions (`.dll.lib`).
1161 let expected_len = t!(filename.metadata()).len();
1162 let filename = filename.file_name().unwrap().to_str().unwrap();
1163 let mut parts = filename.splitn(2, '.');
1164 let file_stem = parts.next().unwrap().to_owned();
1165 let extension = parts.next().unwrap().to_owned();
1167 toplevel.push((file_stem, extension, expected_len));
1175 // Ok now we need to actually find all the files listed in `toplevel`. We've
1176 // got a list of prefix/extensions and we basically just need to find the
1177 // most recent file in the `deps` folder corresponding to each one.
1178 let contents = t!(target_deps_dir.read_dir())
1180 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1181 .collect::<Vec<_>>();
1182 for (prefix, extension, expected_len) in toplevel {
1183 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1184 meta.len() == expected_len
1186 .strip_prefix(&prefix[..])
1187 .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
1190 let max = candidates
1191 .max_by_key(|&&(_, _, ref metadata)| FileTime::from_last_modification_time(metadata));
1192 let path_to_add = match max {
1193 Some(triple) => triple.0.to_str().unwrap(),
1194 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1196 if is_dylib(path_to_add) {
1197 let candidate = format!("{}.lib", path_to_add);
1198 let candidate = PathBuf::from(candidate);
1199 if candidate.exists() {
1200 deps.push((candidate, DependencyType::Target));
1203 deps.push((path_to_add.into(), DependencyType::Target));
1206 deps.extend(additional_target_deps);
1208 let mut new_contents = Vec::new();
1209 for (dep, dependency_type) in deps.iter() {
1210 new_contents.extend(match *dependency_type {
1211 DependencyType::Host => b"h",
1212 DependencyType::Target => b"t",
1213 DependencyType::TargetSelfContained => b"s",
1215 new_contents.extend(dep.to_str().unwrap().as_bytes());
1216 new_contents.extend(b"\0");
1218 t!(fs::write(&stamp, &new_contents));
1219 deps.into_iter().map(|(d, _)| d).collect()
1222 pub fn stream_cargo(
1223 builder: &Builder<'_>,
1225 tail_args: Vec<String>,
1226 cb: &mut dyn FnMut(CargoMessage<'_>),
1228 let mut cargo = Command::from(cargo);
1229 if builder.config.dry_run {
1232 // Instruct Cargo to give us json messages on stdout, critically leaving
1233 // stderr as piped so we can get those pretty colors.
1234 let mut message_format = if builder.config.json_output {
1235 String::from("json")
1237 String::from("json-render-diagnostics")
1239 if let Some(s) = &builder.config.rustc_error_format {
1240 message_format.push_str(",json-diagnostic-");
1241 message_format.push_str(s);
1243 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1245 for arg in tail_args {
1249 builder.verbose(&format!("running: {:?}", cargo));
1250 let mut child = match cargo.spawn() {
1252 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1255 // Spawn Cargo slurping up its JSON output. We'll start building up the
1256 // `deps` array of all files it generated along with a `toplevel` array of
1257 // files we need to probe for later.
1258 let stdout = BufReader::new(child.stdout.take().unwrap());
1259 for line in stdout.lines() {
1260 let line = t!(line);
1261 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1263 if builder.config.json_output {
1264 // Forward JSON to stdout.
1265 println!("{}", line);
1269 // If this was informational, just print it out and continue
1270 Err(_) => println!("{}", line),
1274 // Make sure Cargo actually succeeded after we read all of its stdout.
1275 let status = t!(child.wait());
1276 if !status.success() {
1278 "command did not execute successfully: {:?}\n\
1279 expected success, got: {}",
1286 #[derive(Deserialize)]
1287 pub struct CargoTarget<'a> {
1288 crate_types: Vec<Cow<'a, str>>,
1291 #[derive(Deserialize)]
1292 #[serde(tag = "reason", rename_all = "kebab-case")]
1293 pub enum CargoMessage<'a> {
1295 package_id: Cow<'a, str>,
1296 features: Vec<Cow<'a, str>>,
1297 filenames: Vec<Cow<'a, str>>,
1298 target: CargoTarget<'a>,
1300 BuildScriptExecuted {
1301 package_id: Cow<'a, str>,