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_debug_info, 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 // When downloading stage1, the standard library has already been copied to the sysroot, so
45 // there's no need to rebuild it.
46 let download_rustc = run.builder.config.download_rustc;
47 run.all_krates("test").default_condition(!download_rustc)
50 fn make_run(run: RunConfig<'_>) {
51 run.builder.ensure(Std {
52 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
57 /// Builds the standard library.
59 /// This will build the standard library for a particular stage of the build
60 /// using the `compiler` targeting the `target` architecture. The artifacts
61 /// created will also be linked into the sysroot directory.
62 fn run(self, builder: &Builder<'_>) {
63 let target = self.target;
64 let compiler = self.compiler;
66 // These artifacts were already copied (in `impl Step for Sysroot`).
67 // Don't recompile them.
68 // NOTE: the ABI of the beta compiler is different from the ABI of the downloaded compiler,
69 // so its artifacts can't be reused.
70 if builder.config.download_rustc && compiler.stage != 0 {
74 if builder.config.keep_stage.contains(&compiler.stage)
75 || builder.config.keep_stage_std.contains(&compiler.stage)
77 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
78 builder.ensure(StdLink { compiler, target_compiler: compiler, target });
82 let mut target_deps = builder.ensure(StartupObjects { compiler, target });
84 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
85 if compiler_to_use != compiler {
86 builder.ensure(Std { compiler: compiler_to_use, target });
87 builder.info(&format!("Uplifting stage1 std ({} -> {})", compiler_to_use.host, target));
89 // Even if we're not building std this stage, the new sysroot must
90 // still contain the third party objects needed by various targets.
91 copy_third_party_objects(builder, &compiler, target);
92 copy_self_contained_objects(builder, &compiler, target);
94 builder.ensure(StdLink {
95 compiler: compiler_to_use,
96 target_compiler: compiler,
102 target_deps.extend(copy_third_party_objects(builder, &compiler, target));
103 target_deps.extend(copy_self_contained_objects(builder, &compiler, target));
105 let mut cargo = builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "build");
106 std_cargo(builder, target, compiler.stage, &mut cargo);
108 builder.info(&format!(
109 "Building stage{} std artifacts ({} -> {})",
110 compiler.stage, &compiler.host, target
116 &libstd_stamp(builder, compiler, target),
121 builder.ensure(StdLink {
122 compiler: builder.compiler(compiler.stage, builder.config.build),
123 target_compiler: compiler,
130 builder: &Builder<'_>,
134 target_deps: &mut Vec<(PathBuf, DependencyType)>,
135 dependency_type: DependencyType,
137 let target = libdir.join(name);
138 builder.copy(&sourcedir.join(name), &target);
140 target_deps.push((target, dependency_type));
143 /// Copies third party objects needed by various targets.
144 fn copy_third_party_objects(
145 builder: &Builder<'_>,
147 target: TargetSelection,
148 ) -> Vec<(PathBuf, DependencyType)> {
149 let mut target_deps = vec![];
151 // FIXME: remove this in 2021
152 if target == "x86_64-fortanix-unknown-sgx" {
153 if env::var_os("X86_FORTANIX_SGX_LIBS").is_some() {
154 builder.info("Warning: X86_FORTANIX_SGX_LIBS environment variable is ignored, libunwind is now compiled as part of rustbuild");
158 if builder.config.sanitizers_enabled(target) && compiler.stage != 0 {
159 // The sanitizers are only copied in stage1 or above,
160 // to avoid creating dependency on LLVM.
162 copy_sanitizers(builder, &compiler, target)
164 .map(|d| (d, DependencyType::Target)),
171 /// Copies third party objects needed by various targets for self-contained linkage.
172 fn copy_self_contained_objects(
173 builder: &Builder<'_>,
175 target: TargetSelection,
176 ) -> Vec<(PathBuf, DependencyType)> {
177 let libdir_self_contained = builder.sysroot_libdir(*compiler, target).join("self-contained");
178 t!(fs::create_dir_all(&libdir_self_contained));
179 let mut target_deps = vec![];
181 // Copies the CRT objects.
183 // rustc historically provides a more self-contained installation for musl targets
184 // not requiring the presence of a native musl toolchain. For example, it can fall back
185 // to using gcc from a glibc-targeting toolchain for linking.
186 // To do that we have to distribute musl startup objects as a part of Rust toolchain
187 // and link with them manually in the self-contained mode.
188 if target.contains("musl") {
189 let srcdir = builder.musl_libdir(target).unwrap_or_else(|| {
190 panic!("Target {:?} does not have a \"musl-libdir\" key", target.triple)
192 for &obj in &["crt1.o", "Scrt1.o", "rcrt1.o", "crti.o", "crtn.o"] {
195 &libdir_self_contained,
199 DependencyType::TargetSelfContained,
202 let crt_path = builder.ensure(native::CrtBeginEnd { target });
203 for &obj in &["crtbegin.o", "crtbeginS.o", "crtend.o", "crtendS.o"] {
204 let src = crt_path.join(obj);
205 let target = libdir_self_contained.join(obj);
206 builder.copy(&src, &target);
207 target_deps.push((target, DependencyType::TargetSelfContained));
209 } else if target.ends_with("-wasi") {
213 panic!("Target {:?} does not have a \"wasi-root\" key", target.triple)
215 .join("lib/wasm32-wasi");
216 for &obj in &["crt1-command.o", "crt1-reactor.o"] {
219 &libdir_self_contained,
223 DependencyType::TargetSelfContained,
226 } else if target.contains("windows-gnu") {
227 for obj in ["crt2.o", "dllcrt2.o"].iter() {
228 let src = compiler_file(builder, builder.cc(target), target, obj);
229 let target = libdir_self_contained.join(obj);
230 builder.copy(&src, &target);
231 target_deps.push((target, DependencyType::TargetSelfContained));
238 /// Configure cargo to compile the standard library, adding appropriate env vars
240 pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, cargo: &mut Cargo) {
241 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
242 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
245 // Determine if we're going to compile in optimized C intrinsics to
246 // the `compiler-builtins` crate. These intrinsics live in LLVM's
247 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
248 // always checked out, so we need to conditionally look for this. (e.g. if
249 // an external LLVM is used we skip the LLVM submodule checkout).
251 // Note that this shouldn't affect the correctness of `compiler-builtins`,
252 // but only its speed. Some intrinsics in C haven't been translated to Rust
253 // yet but that's pretty rare. Other intrinsics have optimized
254 // implementations in C which have only had slower versions ported to Rust,
255 // so we favor the C version where we can, but it's not critical.
257 // If `compiler-rt` is available ensure that the `c` feature of the
258 // `compiler-builtins` crate is enabled and it's configured to learn where
259 // `compiler-rt` is located.
260 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
261 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
262 // Note that `libprofiler_builtins/build.rs` also computes this so if
263 // you're changing something here please also change that.
264 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
265 " compiler-builtins-c"
270 if builder.no_std(target) == Some(true) {
271 let mut features = "compiler-builtins-mem".to_string();
272 features.push_str(compiler_builtins_c_feature);
274 // for no-std targets we only compile a few no_std crates
276 .args(&["-p", "alloc"])
277 .arg("--manifest-path")
278 .arg(builder.src.join("library/alloc/Cargo.toml"))
282 let mut features = builder.std_features(target);
283 features.push_str(compiler_builtins_c_feature);
288 .arg("--manifest-path")
289 .arg(builder.src.join("library/test/Cargo.toml"));
291 // Help the libc crate compile by assisting it in finding various
292 // sysroot native libraries.
293 if target.contains("musl") {
294 if let Some(p) = builder.musl_libdir(target) {
295 let root = format!("native={}", p.to_str().unwrap());
296 cargo.rustflag("-L").rustflag(&root);
300 if target.ends_with("-wasi") {
301 if let Some(p) = builder.wasi_root(target) {
302 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
303 cargo.rustflag("-L").rustflag(&root);
308 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
309 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
310 // built with bitcode so that the produced rlibs can be used for both LTO
311 // builds (which use bitcode) and non-LTO builds (which use object code).
312 // So we override the override here!
314 // But we don't bother for the stage 0 compiler because it's never used
317 cargo.rustflag("-Cembed-bitcode=yes");
320 // By default, rustc does not include unwind tables unless they are required
321 // for a particular target. They are not required by RISC-V targets, but
322 // compiling the standard library with them means that users can get
323 // backtraces without having to recompile the standard library themselves.
325 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
326 if target.contains("riscv") {
327 cargo.rustflag("-Cforce-unwind-tables=yes");
331 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
333 pub compiler: Compiler,
334 pub target_compiler: Compiler,
335 pub target: TargetSelection,
338 impl Step for StdLink {
341 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
345 /// Link all libstd rlibs/dylibs into the sysroot location.
347 /// Links those artifacts generated by `compiler` to the `stage` compiler's
348 /// sysroot for the specified `host` and `target`.
350 /// Note that this assumes that `compiler` has already generated the libstd
351 /// libraries for `target`, and this method will find them in the relevant
352 /// output directory.
353 fn run(self, builder: &Builder<'_>) {
354 let compiler = self.compiler;
355 let target_compiler = self.target_compiler;
356 let target = self.target;
357 builder.info(&format!(
358 "Copying stage{} std from stage{} ({} -> {} / {})",
359 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
361 let libdir = builder.sysroot_libdir(target_compiler, target);
362 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
363 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
367 /// Copies sanitizer runtime libraries into target libdir.
369 builder: &Builder<'_>,
371 target: TargetSelection,
373 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
375 if builder.config.dry_run {
379 let mut target_deps = Vec::new();
380 let libdir = builder.sysroot_libdir(*compiler, target);
382 for runtime in &runtimes {
383 let dst = libdir.join(&runtime.name);
384 builder.copy(&runtime.path, &dst);
386 if target == "x86_64-apple-darwin" || target == "aarch64-apple-darwin" {
387 // Update the library’s install name to reflect that it has has been renamed.
388 apple_darwin_update_library_name(&dst, &format!("@rpath/{}", &runtime.name));
389 // Upon renaming the install name, the code signature of the file will invalidate,
390 // so we will sign it again.
391 apple_darwin_sign_file(&dst);
394 target_deps.push(dst);
400 fn apple_darwin_update_library_name(library_path: &Path, new_name: &str) {
401 let status = Command::new("install_name_tool")
406 .expect("failed to execute `install_name_tool`");
407 assert!(status.success());
410 fn apple_darwin_sign_file(file_path: &Path) {
411 let status = Command::new("codesign")
412 .arg("-f") // Force to rewrite the existing signature
417 .expect("failed to execute `codesign`");
418 assert!(status.success());
421 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
422 pub struct StartupObjects {
423 pub compiler: Compiler,
424 pub target: TargetSelection,
427 impl Step for StartupObjects {
428 type Output = Vec<(PathBuf, DependencyType)>;
430 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
431 run.path("library/rtstartup")
434 fn make_run(run: RunConfig<'_>) {
435 run.builder.ensure(StartupObjects {
436 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
441 /// Builds and prepare startup objects like rsbegin.o and rsend.o
443 /// These are primarily used on Windows right now for linking executables/dlls.
444 /// They don't require any library support as they're just plain old object
445 /// files, so we just use the nightly snapshot compiler to always build them (as
446 /// no other compilers are guaranteed to be available).
447 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
448 let for_compiler = self.compiler;
449 let target = self.target;
450 if !target.contains("windows-gnu") {
454 let mut target_deps = vec![];
456 let src_dir = &builder.src.join("library").join("rtstartup");
457 let dst_dir = &builder.native_dir(target).join("rtstartup");
458 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
459 t!(fs::create_dir_all(dst_dir));
461 for file in &["rsbegin", "rsend"] {
462 let src_file = &src_dir.join(file.to_string() + ".rs");
463 let dst_file = &dst_dir.join(file.to_string() + ".o");
464 if !up_to_date(src_file, dst_file) {
465 let mut cmd = Command::new(&builder.initial_rustc);
466 cmd.env("RUSTC_BOOTSTRAP", "1");
467 if !builder.local_rebuild {
468 // a local_rebuild compiler already has stage1 features
469 cmd.arg("--cfg").arg("bootstrap");
473 .arg(target.rustc_target_arg())
481 let target = sysroot_dir.join((*file).to_string() + ".o");
482 builder.copy(dst_file, &target);
483 target_deps.push((target, DependencyType::Target));
490 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
492 pub target: TargetSelection,
493 pub compiler: Compiler,
496 impl Step for Rustc {
498 const ONLY_HOSTS: bool = true;
499 const DEFAULT: bool = false;
501 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
502 run.path("compiler/rustc")
505 fn make_run(run: RunConfig<'_>) {
506 run.builder.ensure(Rustc {
507 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
512 /// Builds the compiler.
514 /// This will build the compiler for a particular stage of the build using
515 /// the `compiler` targeting the `target` architecture. The artifacts
516 /// created will also be linked into the sysroot directory.
517 fn run(self, builder: &Builder<'_>) {
518 let compiler = self.compiler;
519 let target = self.target;
521 // NOTE: the ABI of the beta compiler is different from the ABI of the downloaded compiler,
522 // so its artifacts can't be reused.
523 if builder.config.download_rustc && compiler.stage != 0 {
524 // Copy the existing artifacts instead of rebuilding them.
525 // NOTE: this path is only taken for tools linking to rustc-dev.
526 builder.ensure(Sysroot { compiler });
530 builder.ensure(Std { compiler, target });
532 if builder.config.keep_stage.contains(&compiler.stage) {
533 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
534 builder.info("Warning: Use `--keep-stage-std` if you want to rebuild the compiler when it changes");
535 builder.ensure(RustcLink { compiler, target_compiler: compiler, target });
539 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
540 if compiler_to_use != compiler {
541 builder.ensure(Rustc { compiler: compiler_to_use, target });
543 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
544 builder.ensure(RustcLink {
545 compiler: compiler_to_use,
546 target_compiler: compiler,
552 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
554 compiler: builder.compiler(self.compiler.stage, builder.config.build),
555 target: builder.config.build,
558 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "build");
559 rustc_cargo(builder, &mut cargo, target);
561 if builder.config.rust_profile_use.is_some()
562 && builder.config.rust_profile_generate.is_some()
564 panic!("Cannot use and generate PGO profiles at the same time");
567 let is_collecting = if let Some(path) = &builder.config.rust_profile_generate {
568 if compiler.stage == 1 {
569 cargo.rustflag(&format!("-Cprofile-generate={}", path));
570 // Apparently necessary to avoid overflowing the counters during
571 // a Cargo build profile
572 cargo.rustflag("-Cllvm-args=-vp-counters-per-site=4");
577 } else if let Some(path) = &builder.config.rust_profile_use {
578 if compiler.stage == 1 {
579 cargo.rustflag(&format!("-Cprofile-use={}", path));
580 cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
589 // Ensure paths to Rust sources are relative, not absolute.
590 cargo.rustflag(&format!(
591 "-Cllvm-args=-static-func-strip-dirname-prefix={}",
592 builder.config.src.components().count()
596 builder.info(&format!(
597 "Building stage{} compiler artifacts ({} -> {})",
598 compiler.stage, &compiler.host, target
604 &librustc_stamp(builder, compiler, target),
609 builder.ensure(RustcLink {
610 compiler: builder.compiler(compiler.stage, builder.config.build),
611 target_compiler: compiler,
617 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
620 .arg(builder.rustc_features())
621 .arg("--manifest-path")
622 .arg(builder.src.join("compiler/rustc/Cargo.toml"));
623 rustc_cargo_env(builder, cargo, target);
626 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
627 // Set some configuration variables picked up by build scripts and
628 // the compiler alike
630 .env("CFG_RELEASE", builder.rust_release())
631 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
632 .env("CFG_VERSION", builder.rust_version())
633 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default());
635 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
636 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
638 if let Some(ref ver_date) = builder.rust_info.commit_date() {
639 cargo.env("CFG_VER_DATE", ver_date);
641 if let Some(ref ver_hash) = builder.rust_info.sha() {
642 cargo.env("CFG_VER_HASH", ver_hash);
644 if !builder.unstable_features() {
645 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
647 if let Some(ref s) = builder.config.rustc_default_linker {
648 cargo.env("CFG_DEFAULT_LINKER", s);
650 if builder.config.rustc_parallel {
651 cargo.rustflag("--cfg=parallel_compiler");
652 cargo.rustdocflag("--cfg=parallel_compiler");
654 if builder.config.rust_verify_llvm_ir {
655 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
658 // Pass down configuration from the LLVM build into the build of
659 // rustc_llvm and rustc_codegen_llvm.
661 // Note that this is disabled if LLVM itself is disabled or we're in a check
662 // build. If we are in a check build we still go ahead here presuming we've
663 // detected that LLVM is alreay built and good to go which helps prevent
664 // busting caches (e.g. like #71152).
665 if builder.config.llvm_enabled()
666 && (builder.kind != Kind::Check
667 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
669 if builder.is_rust_llvm(target) {
670 cargo.env("LLVM_RUSTLLVM", "1");
672 let llvm_config = builder.ensure(native::Llvm { target });
673 cargo.env("LLVM_CONFIG", &llvm_config);
674 let target_config = builder.config.target_config.get(&target);
675 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
676 cargo.env("CFG_LLVM_ROOT", s);
678 // Some LLVM linker flags (-L and -l) may be needed to link rustc_llvm.
679 if let Some(ref s) = builder.config.llvm_ldflags {
680 cargo.env("LLVM_LINKER_FLAGS", s);
682 // Building with a static libstdc++ is only supported on linux right now,
683 // not for MSVC or macOS
684 if builder.config.llvm_static_stdcpp
685 && !target.contains("freebsd")
686 && !target.contains("msvc")
687 && !target.contains("apple")
689 let file = compiler_file(builder, builder.cxx(target).unwrap(), target, "libstdc++.a");
690 cargo.env("LLVM_STATIC_STDCPP", file);
692 if builder.config.llvm_link_shared {
693 cargo.env("LLVM_LINK_SHARED", "1");
695 if builder.config.llvm_use_libcxx {
696 cargo.env("LLVM_USE_LIBCXX", "1");
698 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
699 cargo.env("LLVM_NDEBUG", "1");
704 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
706 pub compiler: Compiler,
707 pub target_compiler: Compiler,
708 pub target: TargetSelection,
711 impl Step for RustcLink {
714 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
718 /// Same as `std_link`, only for librustc
719 fn run(self, builder: &Builder<'_>) {
720 let compiler = self.compiler;
721 let target_compiler = self.target_compiler;
722 let target = self.target;
723 builder.info(&format!(
724 "Copying stage{} rustc from stage{} ({} -> {} / {})",
725 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
729 &builder.sysroot_libdir(target_compiler, target),
730 &builder.sysroot_libdir(target_compiler, compiler.host),
731 &librustc_stamp(builder, compiler, target),
736 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
737 pub struct CodegenBackend {
738 pub target: TargetSelection,
739 pub compiler: Compiler,
740 pub backend: Interned<String>,
743 impl Step for CodegenBackend {
745 const ONLY_HOSTS: bool = true;
746 // Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
747 const DEFAULT: bool = true;
749 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
750 run.path("compiler/rustc_codegen_cranelift")
753 fn make_run(run: RunConfig<'_>) {
754 for &backend in &run.builder.config.rust_codegen_backends {
755 if backend == "llvm" {
756 continue; // Already built as part of rustc
759 run.builder.ensure(CodegenBackend {
761 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
767 fn run(self, builder: &Builder<'_>) {
768 let compiler = self.compiler;
769 let target = self.target;
770 let backend = self.backend;
772 builder.ensure(Rustc { compiler, target });
774 if builder.config.keep_stage.contains(&compiler.stage) {
776 "Warning: Using a potentially old codegen backend. \
777 This may not behave well.",
779 // Codegen backends are linked separately from this step today, so we don't do
784 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
785 if compiler_to_use != compiler {
786 builder.ensure(CodegenBackend { compiler: compiler_to_use, target, backend });
790 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
793 builder.cargo(compiler, Mode::Codegen, SourceType::Submodule, target, "build");
795 .arg("--manifest-path")
796 .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));
797 rustc_cargo_env(builder, &mut cargo, target);
799 let tmp_stamp = out_dir.join(".tmp.stamp");
801 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false);
802 if builder.config.dry_run {
805 let mut files = files.into_iter().filter(|f| {
806 let filename = f.file_name().unwrap().to_str().unwrap();
807 is_dylib(filename) && filename.contains("rustc_codegen_")
809 let codegen_backend = match files.next() {
811 None => panic!("no dylibs built for codegen backend?"),
813 if let Some(f) = files.next() {
815 "codegen backend built two dylibs:\n{}\n{}",
816 codegen_backend.display(),
820 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
821 let codegen_backend = codegen_backend.to_str().unwrap();
822 t!(fs::write(&stamp, &codegen_backend));
826 /// Creates the `codegen-backends` folder for a compiler that's about to be
827 /// assembled as a complete compiler.
829 /// This will take the codegen artifacts produced by `compiler` and link them
830 /// into an appropriate location for `target_compiler` to be a functional
832 fn copy_codegen_backends_to_sysroot(
833 builder: &Builder<'_>,
835 target_compiler: Compiler,
837 let target = target_compiler.host;
839 // Note that this step is different than all the other `*Link` steps in
840 // that it's not assembling a bunch of libraries but rather is primarily
841 // moving the codegen backend into place. The codegen backend of rustc is
842 // not linked into the main compiler by default but is rather dynamically
843 // selected at runtime for inclusion.
845 // Here we're looking for the output dylib of the `CodegenBackend` step and
846 // we're copying that into the `codegen-backends` folder.
847 let dst = builder.sysroot_codegen_backends(target_compiler);
848 t!(fs::create_dir_all(&dst), dst);
850 if builder.config.dry_run {
854 for backend in builder.config.rust_codegen_backends.iter() {
855 if backend == "llvm" {
856 continue; // Already built as part of rustc
859 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
860 let dylib = t!(fs::read_to_string(&stamp));
861 let file = Path::new(&dylib);
862 let filename = file.file_name().unwrap().to_str().unwrap();
863 // change `librustc_codegen_cranelift-xxxxxx.so` to
864 // `librustc_codegen_cranelift-release.so`
865 let target_filename = {
866 let dash = filename.find('-').unwrap();
867 let dot = filename.find('.').unwrap();
868 format!("{}-{}{}", &filename[..dash], builder.rust_release(), &filename[dot..])
870 builder.copy(&file, &dst.join(target_filename));
874 /// Cargo's output path for the standard library in a given stage, compiled
875 /// by a particular compiler for the specified target.
876 pub fn libstd_stamp(builder: &Builder<'_>, compiler: Compiler, target: TargetSelection) -> PathBuf {
877 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
880 /// Cargo's output path for librustc in a given stage, compiled by a particular
881 /// compiler for the specified target.
882 pub fn librustc_stamp(
883 builder: &Builder<'_>,
885 target: TargetSelection,
887 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
890 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
891 /// compiler for the specified target and backend.
892 fn codegen_backend_stamp(
893 builder: &Builder<'_>,
895 target: TargetSelection,
896 backend: Interned<String>,
899 .cargo_out(compiler, Mode::Codegen, target)
900 .join(format!(".librustc_codegen_{}.stamp", backend))
903 pub fn compiler_file(
904 builder: &Builder<'_>,
906 target: TargetSelection,
909 let mut cmd = Command::new(compiler);
910 cmd.args(builder.cflags(target, GitRepo::Rustc));
911 cmd.arg(format!("-print-file-name={}", file));
912 let out = output(&mut cmd);
913 PathBuf::from(out.trim())
916 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
918 pub compiler: Compiler,
921 impl Step for Sysroot {
922 type Output = Interned<PathBuf>;
924 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
928 /// Returns the sysroot for the `compiler` specified that *this build system
931 /// That is, the sysroot for the stage0 compiler is not what the compiler
932 /// thinks it is by default, but it's the same as the default for stages
934 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
935 let compiler = self.compiler;
936 let sysroot = if compiler.stage == 0 {
937 builder.out.join(&compiler.host.triple).join("stage0-sysroot")
939 builder.out.join(&compiler.host.triple).join(format!("stage{}", compiler.stage))
941 let _ = fs::remove_dir_all(&sysroot);
942 t!(fs::create_dir_all(&sysroot));
944 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
945 if builder.config.download_rustc && compiler.stage != 0 {
947 builder.config.build, compiler.host,
948 "Cross-compiling is not yet supported with `download-rustc`",
950 // Copy the compiler into the correct sysroot.
952 builder.config.out.join(&*builder.config.build.triple).join("ci-rustc");
953 builder.cp_r(&ci_rustc_dir, &sysroot);
954 return INTERNER.intern_path(sysroot);
957 // Symlink the source root into the same location inside the sysroot,
958 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
959 // so that any tools relying on `rust-src` also work for local builds,
960 // and also for translating the virtual `/rustc/$hash` back to the real
961 // directory (for running tests with `rust.remap-debuginfo = true`).
962 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
963 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
964 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
965 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
967 "warning: creating symbolic link `{}` to `{}` failed with {}",
968 sysroot_lib_rustlib_src_rust.display(),
969 builder.src.display(),
972 if builder.config.rust_remap_debuginfo {
974 "warning: some `src/test/ui` tests will fail when lacking `{}`",
975 sysroot_lib_rustlib_src_rust.display(),
980 INTERNER.intern_path(sysroot)
984 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
985 pub struct Assemble {
986 /// The compiler which we will produce in this step. Assemble itself will
987 /// take care of ensuring that the necessary prerequisites to do so exist,
988 /// that is, this target can be a stage2 compiler and Assemble will build
989 /// previous stages for you.
990 pub target_compiler: Compiler,
993 impl Step for Assemble {
994 type Output = Compiler;
996 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1000 /// Prepare a new compiler from the artifacts in `stage`
1002 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
1003 /// must have been previously produced by the `stage - 1` builder.build
1005 fn run(self, builder: &Builder<'_>) -> Compiler {
1006 let target_compiler = self.target_compiler;
1008 if target_compiler.stage == 0 {
1010 builder.config.build, target_compiler.host,
1011 "Cannot obtain compiler for non-native build triple at stage 0"
1013 // The stage 0 compiler for the build triple is always pre-built.
1014 return target_compiler;
1017 // Get the compiler that we'll use to bootstrap ourselves.
1019 // Note that this is where the recursive nature of the bootstrap
1020 // happens, as this will request the previous stage's compiler on
1021 // downwards to stage 0.
1023 // Also note that we're building a compiler for the host platform. We
1024 // only assume that we can run `build` artifacts, which means that to
1025 // produce some other architecture compiler we need to start from
1026 // `build` to get there.
1028 // FIXME: It may be faster if we build just a stage 1 compiler and then
1029 // use that to bootstrap this compiler forward.
1030 let build_compiler = builder.compiler(target_compiler.stage - 1, builder.config.build);
1032 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
1033 if builder.config.download_rustc {
1034 builder.ensure(Sysroot { compiler: target_compiler });
1035 return target_compiler;
1038 // Build the libraries for this compiler to link to (i.e., the libraries
1039 // it uses at runtime). NOTE: Crates the target compiler compiles don't
1040 // link to these. (FIXME: Is that correct? It seems to be correct most
1041 // of the time but I think we do link to these for stage2/bin compilers
1042 // when not performing a full bootstrap).
1043 builder.ensure(Rustc { compiler: build_compiler, target: target_compiler.host });
1045 for &backend in builder.config.rust_codegen_backends.iter() {
1046 if backend == "llvm" {
1047 continue; // Already built as part of rustc
1050 builder.ensure(CodegenBackend {
1051 compiler: build_compiler,
1052 target: target_compiler.host,
1057 let lld_install = if builder.config.lld_enabled {
1058 Some(builder.ensure(native::Lld { target: target_compiler.host }))
1063 let stage = target_compiler.stage;
1064 let host = target_compiler.host;
1065 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
1067 // Link in all dylibs to the libdir
1068 let stamp = librustc_stamp(builder, build_compiler, target_compiler.host);
1069 let proc_macros = builder
1070 .read_stamp_file(&stamp)
1072 .filter_map(|(path, dependency_type)| {
1073 if dependency_type == DependencyType::Host {
1074 Some(path.file_name().unwrap().to_owned().into_string().unwrap())
1079 .collect::<HashSet<_>>();
1081 let sysroot = builder.sysroot(target_compiler);
1082 let rustc_libdir = builder.rustc_libdir(target_compiler);
1083 t!(fs::create_dir_all(&rustc_libdir));
1084 let src_libdir = builder.sysroot_libdir(build_compiler, host);
1085 for f in builder.read_dir(&src_libdir) {
1086 let filename = f.file_name().into_string().unwrap();
1087 if (is_dylib(&filename) || is_debug_info(&filename)) && !proc_macros.contains(&filename)
1089 builder.copy(&f.path(), &rustc_libdir.join(&filename));
1093 copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
1095 // We prepend this bin directory to the user PATH when linking Rust binaries. To
1096 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
1097 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
1098 let libdir_bin = libdir.parent().unwrap().join("bin");
1099 t!(fs::create_dir_all(&libdir_bin));
1101 if let Some(lld_install) = lld_install {
1102 let src_exe = exe("lld", target_compiler.host);
1103 let dst_exe = exe("rust-lld", target_compiler.host);
1104 builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
1107 // Similarly, copy `llvm-dwp` into libdir for Split DWARF. Only copy it when the LLVM
1108 // backend is used to avoid unnecessarily building LLVM and because LLVM is not checked
1109 // out by default when the LLVM backend is not enabled.
1110 if builder.config.rust_codegen_backends.contains(&INTERNER.intern_str("llvm")) {
1111 let src_exe = exe("llvm-dwp", target_compiler.host);
1112 let dst_exe = exe("rust-llvm-dwp", target_compiler.host);
1113 let llvm_config_bin = builder.ensure(native::Llvm { target: target_compiler.host });
1114 if !builder.config.dry_run {
1115 let llvm_bin_dir = output(Command::new(llvm_config_bin).arg("--bindir"));
1116 let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
1117 builder.copy(&llvm_bin_dir.join(&src_exe), &libdir_bin.join(&dst_exe));
1121 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
1122 // so that it can be found when the newly built `rustc` is run.
1123 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
1124 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
1126 // Link the compiler binary itself into place
1127 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1128 let rustc = out_dir.join(exe("rustc-main", host));
1129 let bindir = sysroot.join("bin");
1130 t!(fs::create_dir_all(&bindir));
1131 let compiler = builder.rustc(target_compiler);
1132 builder.copy(&rustc, &compiler);
1138 /// Link some files into a rustc sysroot.
1140 /// For a particular stage this will link the file listed in `stamp` into the
1141 /// `sysroot_dst` provided.
1142 pub fn add_to_sysroot(
1143 builder: &Builder<'_>,
1145 sysroot_host_dst: &Path,
1148 let self_contained_dst = &sysroot_dst.join("self-contained");
1149 t!(fs::create_dir_all(&sysroot_dst));
1150 t!(fs::create_dir_all(&sysroot_host_dst));
1151 t!(fs::create_dir_all(&self_contained_dst));
1152 for (path, dependency_type) in builder.read_stamp_file(stamp) {
1153 let dst = match dependency_type {
1154 DependencyType::Host => sysroot_host_dst,
1155 DependencyType::Target => sysroot_dst,
1156 DependencyType::TargetSelfContained => self_contained_dst,
1158 builder.copy(&path, &dst.join(path.file_name().unwrap()));
1163 builder: &Builder<'_>,
1165 tail_args: Vec<String>,
1167 additional_target_deps: Vec<(PathBuf, DependencyType)>,
1170 if builder.config.dry_run {
1174 // `target_root_dir` looks like $dir/$target/release
1175 let target_root_dir = stamp.parent().unwrap();
1176 // `target_deps_dir` looks like $dir/$target/release/deps
1177 let target_deps_dir = target_root_dir.join("deps");
1178 // `host_root_dir` looks like $dir/release
1179 let host_root_dir = target_root_dir
1181 .unwrap() // chop off `release`
1183 .unwrap() // chop off `$target`
1184 .join(target_root_dir.file_name().unwrap());
1186 // Spawn Cargo slurping up its JSON output. We'll start building up the
1187 // `deps` array of all files it generated along with a `toplevel` array of
1188 // files we need to probe for later.
1189 let mut deps = Vec::new();
1190 let mut toplevel = Vec::new();
1191 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1192 let (filenames, crate_types) = match msg {
1193 CargoMessage::CompilerArtifact {
1195 target: CargoTarget { crate_types },
1197 } => (filenames, crate_types),
1200 for filename in filenames {
1201 // Skip files like executables
1202 if !(filename.ends_with(".rlib")
1203 || filename.ends_with(".lib")
1204 || filename.ends_with(".a")
1205 || is_debug_info(&filename)
1206 || is_dylib(&filename)
1207 || (is_check && filename.ends_with(".rmeta")))
1212 let filename = Path::new(&*filename);
1214 // If this was an output file in the "host dir" we don't actually
1215 // worry about it, it's not relevant for us
1216 if filename.starts_with(&host_root_dir) {
1217 // Unless it's a proc macro used in the compiler
1218 if crate_types.iter().any(|t| t == "proc-macro") {
1219 deps.push((filename.to_path_buf(), DependencyType::Host));
1224 // If this was output in the `deps` dir then this is a precise file
1225 // name (hash included) so we start tracking it.
1226 if filename.starts_with(&target_deps_dir) {
1227 deps.push((filename.to_path_buf(), DependencyType::Target));
1231 // Otherwise this was a "top level artifact" which right now doesn't
1232 // have a hash in the name, but there's a version of this file in
1233 // the `deps` folder which *does* have a hash in the name. That's
1234 // the one we'll want to we'll probe for it later.
1236 // We do not use `Path::file_stem` or `Path::extension` here,
1237 // because some generated files may have multiple extensions e.g.
1238 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1239 // split the file name by the last extension (`.lib`) while we need
1240 // to split by all extensions (`.dll.lib`).
1241 let expected_len = t!(filename.metadata()).len();
1242 let filename = filename.file_name().unwrap().to_str().unwrap();
1243 let mut parts = filename.splitn(2, '.');
1244 let file_stem = parts.next().unwrap().to_owned();
1245 let extension = parts.next().unwrap().to_owned();
1247 toplevel.push((file_stem, extension, expected_len));
1255 // Ok now we need to actually find all the files listed in `toplevel`. We've
1256 // got a list of prefix/extensions and we basically just need to find the
1257 // most recent file in the `deps` folder corresponding to each one.
1258 let contents = t!(target_deps_dir.read_dir())
1260 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1261 .collect::<Vec<_>>();
1262 for (prefix, extension, expected_len) in toplevel {
1263 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1264 meta.len() == expected_len
1266 .strip_prefix(&prefix[..])
1267 .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
1270 let max = candidates
1271 .max_by_key(|&&(_, _, ref metadata)| FileTime::from_last_modification_time(metadata));
1272 let path_to_add = match max {
1273 Some(triple) => triple.0.to_str().unwrap(),
1274 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1276 if is_dylib(path_to_add) {
1277 let candidate = format!("{}.lib", path_to_add);
1278 let candidate = PathBuf::from(candidate);
1279 if candidate.exists() {
1280 deps.push((candidate, DependencyType::Target));
1283 deps.push((path_to_add.into(), DependencyType::Target));
1286 deps.extend(additional_target_deps);
1288 let mut new_contents = Vec::new();
1289 for (dep, dependency_type) in deps.iter() {
1290 new_contents.extend(match *dependency_type {
1291 DependencyType::Host => b"h",
1292 DependencyType::Target => b"t",
1293 DependencyType::TargetSelfContained => b"s",
1295 new_contents.extend(dep.to_str().unwrap().as_bytes());
1296 new_contents.extend(b"\0");
1298 t!(fs::write(&stamp, &new_contents));
1299 deps.into_iter().map(|(d, _)| d).collect()
1302 pub fn stream_cargo(
1303 builder: &Builder<'_>,
1305 tail_args: Vec<String>,
1306 cb: &mut dyn FnMut(CargoMessage<'_>),
1308 let mut cargo = Command::from(cargo);
1309 if builder.config.dry_run {
1312 // Instruct Cargo to give us json messages on stdout, critically leaving
1313 // stderr as piped so we can get those pretty colors.
1314 let mut message_format = if builder.config.json_output {
1315 String::from("json")
1317 String::from("json-render-diagnostics")
1319 if let Some(s) = &builder.config.rustc_error_format {
1320 message_format.push_str(",json-diagnostic-");
1321 message_format.push_str(s);
1323 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1325 for arg in tail_args {
1329 builder.verbose(&format!("running: {:?}", cargo));
1330 let mut child = match cargo.spawn() {
1332 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1335 // Spawn Cargo slurping up its JSON output. We'll start building up the
1336 // `deps` array of all files it generated along with a `toplevel` array of
1337 // files we need to probe for later.
1338 let stdout = BufReader::new(child.stdout.take().unwrap());
1339 for line in stdout.lines() {
1340 let line = t!(line);
1341 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1343 if builder.config.json_output {
1344 // Forward JSON to stdout.
1345 println!("{}", line);
1349 // If this was informational, just print it out and continue
1350 Err(_) => println!("{}", line),
1354 // Make sure Cargo actually succeeded after we read all of its stdout.
1355 let status = t!(child.wait());
1356 if !status.success() {
1358 "command did not execute successfully: {:?}\n\
1359 expected success, got: {}",
1366 #[derive(Deserialize)]
1367 pub struct CargoTarget<'a> {
1368 crate_types: Vec<Cow<'a, str>>,
1371 #[derive(Deserialize)]
1372 #[serde(tag = "reason", rename_all = "kebab-case")]
1373 pub enum CargoMessage<'a> {
1375 package_id: Cow<'a, str>,
1376 features: Vec<Cow<'a, str>>,
1377 filenames: Vec<Cow<'a, str>>,
1378 target: CargoTarget<'a>,
1380 BuildScriptExecuted {
1381 package_id: Cow<'a, str>,