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 // 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 if builder.config.keep_stage.contains(&compiler.stage)
67 || builder.config.keep_stage_std.contains(&compiler.stage)
69 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
70 builder.ensure(StdLink { compiler, target_compiler: compiler, target });
74 let mut target_deps = builder.ensure(StartupObjects { compiler, target });
76 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
77 if compiler_to_use != compiler {
78 builder.ensure(Std { compiler: compiler_to_use, target });
79 builder.info(&format!("Uplifting stage1 std ({} -> {})", compiler_to_use.host, target));
81 // Even if we're not building std this stage, the new sysroot must
82 // still contain the third party objects needed by various targets.
83 copy_third_party_objects(builder, &compiler, target);
84 copy_self_contained_objects(builder, &compiler, target);
86 builder.ensure(StdLink {
87 compiler: compiler_to_use,
88 target_compiler: compiler,
94 target_deps.extend(copy_third_party_objects(builder, &compiler, target));
95 target_deps.extend(copy_self_contained_objects(builder, &compiler, target));
97 let mut cargo = builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "build");
98 std_cargo(builder, target, compiler.stage, &mut cargo);
100 builder.info(&format!(
101 "Building stage{} std artifacts ({} -> {})",
102 compiler.stage, &compiler.host, target
108 &libstd_stamp(builder, compiler, target),
113 builder.ensure(StdLink {
114 compiler: builder.compiler(compiler.stage, builder.config.build),
115 target_compiler: compiler,
122 builder: &Builder<'_>,
126 target_deps: &mut Vec<(PathBuf, DependencyType)>,
127 dependency_type: DependencyType,
129 let target = libdir.join(name);
130 builder.copy(&sourcedir.join(name), &target);
132 target_deps.push((target, dependency_type));
135 /// Copies third party objects needed by various targets.
136 fn copy_third_party_objects(
137 builder: &Builder<'_>,
139 target: TargetSelection,
140 ) -> Vec<(PathBuf, DependencyType)> {
141 let mut target_deps = vec![];
143 // FIXME: remove this in 2021
144 if target == "x86_64-fortanix-unknown-sgx" {
145 if env::var_os("X86_FORTANIX_SGX_LIBS").is_some() {
146 builder.info("Warning: X86_FORTANIX_SGX_LIBS environment variable is ignored, libunwind is now compiled as part of rustbuild");
150 if builder.config.sanitizers_enabled(target) && compiler.stage != 0 {
151 // The sanitizers are only copied in stage1 or above,
152 // to avoid creating dependency on LLVM.
154 copy_sanitizers(builder, &compiler, target)
156 .map(|d| (d, DependencyType::Target)),
163 /// Copies third party objects needed by various targets for self-contained linkage.
164 fn copy_self_contained_objects(
165 builder: &Builder<'_>,
167 target: TargetSelection,
168 ) -> Vec<(PathBuf, DependencyType)> {
169 let libdir_self_contained = builder.sysroot_libdir(*compiler, target).join("self-contained");
170 t!(fs::create_dir_all(&libdir_self_contained));
171 let mut target_deps = vec![];
173 // Copies the CRT objects.
175 // rustc historically provides a more self-contained installation for musl targets
176 // not requiring the presence of a native musl toolchain. For example, it can fall back
177 // to using gcc from a glibc-targeting toolchain for linking.
178 // To do that we have to distribute musl startup objects as a part of Rust toolchain
179 // and link with them manually in the self-contained mode.
180 if target.contains("musl") {
181 let srcdir = builder.musl_libdir(target).unwrap();
182 for &obj in &["crt1.o", "Scrt1.o", "rcrt1.o", "crti.o", "crtn.o"] {
185 &libdir_self_contained,
189 DependencyType::TargetSelfContained,
192 } else if target.ends_with("-wasi") {
193 let srcdir = builder.wasi_root(target).unwrap().join("lib/wasm32-wasi");
194 for &obj in &["crt1.o", "crt1-reactor.o"] {
197 &libdir_self_contained,
201 DependencyType::TargetSelfContained,
204 } else if target.contains("windows-gnu") {
205 for obj in ["crt2.o", "dllcrt2.o"].iter() {
206 let src = compiler_file(builder, builder.cc(target), target, obj);
207 let target = libdir_self_contained.join(obj);
208 builder.copy(&src, &target);
209 target_deps.push((target, DependencyType::TargetSelfContained));
216 /// Configure cargo to compile the standard library, adding appropriate env vars
218 pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, cargo: &mut Cargo) {
219 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
220 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
223 // Determine if we're going to compile in optimized C intrinsics to
224 // the `compiler-builtins` crate. These intrinsics live in LLVM's
225 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
226 // always checked out, so we need to conditionally look for this. (e.g. if
227 // an external LLVM is used we skip the LLVM submodule checkout).
229 // Note that this shouldn't affect the correctness of `compiler-builtins`,
230 // but only its speed. Some intrinsics in C haven't been translated to Rust
231 // yet but that's pretty rare. Other intrinsics have optimized
232 // implementations in C which have only had slower versions ported to Rust,
233 // so we favor the C version where we can, but it's not critical.
235 // If `compiler-rt` is available ensure that the `c` feature of the
236 // `compiler-builtins` crate is enabled and it's configured to learn where
237 // `compiler-rt` is located.
238 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
239 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
240 // Note that `libprofiler_builtins/build.rs` also computes this so if
241 // you're changing something here please also change that.
242 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
243 " compiler-builtins-c"
248 if builder.no_std(target) == Some(true) {
249 let mut features = "compiler-builtins-mem".to_string();
250 features.push_str(compiler_builtins_c_feature);
252 // for no-std targets we only compile a few no_std crates
254 .args(&["-p", "alloc"])
255 .arg("--manifest-path")
256 .arg(builder.src.join("library/alloc/Cargo.toml"))
260 let mut features = builder.std_features(target);
261 features.push_str(compiler_builtins_c_feature);
266 .arg("--manifest-path")
267 .arg(builder.src.join("library/test/Cargo.toml"));
269 // Help the libc crate compile by assisting it in finding various
270 // sysroot native libraries.
271 if target.contains("musl") {
272 if let Some(p) = builder.musl_libdir(target) {
273 let root = format!("native={}", p.to_str().unwrap());
274 cargo.rustflag("-L").rustflag(&root);
278 if target.ends_with("-wasi") {
279 if let Some(p) = builder.wasi_root(target) {
280 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
281 cargo.rustflag("-L").rustflag(&root);
286 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
287 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
288 // built with bitcode so that the produced rlibs can be used for both LTO
289 // builds (which use bitcode) and non-LTO builds (which use object code).
290 // So we override the override here!
292 // But we don't bother for the stage 0 compiler because it's never used
295 cargo.rustflag("-Cembed-bitcode=yes");
298 // By default, rustc does not include unwind tables unless they are required
299 // for a particular target. They are not required by RISC-V targets, but
300 // compiling the standard library with them means that users can get
301 // backtraces without having to recompile the standard library themselves.
303 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
304 if target.contains("riscv") {
305 cargo.rustflag("-Cforce-unwind-tables=yes");
309 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
311 pub compiler: Compiler,
312 pub target_compiler: Compiler,
313 pub target: TargetSelection,
316 impl Step for StdLink {
319 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
323 /// Link all libstd rlibs/dylibs into the sysroot location.
325 /// Links those artifacts generated by `compiler` to the `stage` compiler's
326 /// sysroot for the specified `host` and `target`.
328 /// Note that this assumes that `compiler` has already generated the libstd
329 /// libraries for `target`, and this method will find them in the relevant
330 /// output directory.
331 fn run(self, builder: &Builder<'_>) {
332 let compiler = self.compiler;
333 let target_compiler = self.target_compiler;
334 let target = self.target;
335 builder.info(&format!(
336 "Copying stage{} std from stage{} ({} -> {} / {})",
337 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
339 let libdir = builder.sysroot_libdir(target_compiler, target);
340 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
341 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
345 /// Copies sanitizer runtime libraries into target libdir.
347 builder: &Builder<'_>,
349 target: TargetSelection,
351 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
353 if builder.config.dry_run {
357 let mut target_deps = Vec::new();
358 let libdir = builder.sysroot_libdir(*compiler, target);
360 for runtime in &runtimes {
361 let dst = libdir.join(&runtime.name);
362 builder.copy(&runtime.path, &dst);
364 if target == "x86_64-apple-darwin" || target == "aarch64-apple-darwin" {
365 // Update the library’s install name to reflect that it has has been renamed.
366 apple_darwin_update_library_name(&dst, &format!("@rpath/{}", &runtime.name));
367 // Upon renaming the install name, the code signature of the file will invalidate,
368 // so we will sign it again.
369 apple_darwin_sign_file(&dst);
372 target_deps.push(dst);
378 fn apple_darwin_update_library_name(library_path: &Path, new_name: &str) {
379 let status = Command::new("install_name_tool")
384 .expect("failed to execute `install_name_tool`");
385 assert!(status.success());
388 fn apple_darwin_sign_file(file_path: &Path) {
389 let status = Command::new("codesign")
390 .arg("-f") // Force to rewrite the existing signature
395 .expect("failed to execute `codesign`");
396 assert!(status.success());
399 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
400 pub struct StartupObjects {
401 pub compiler: Compiler,
402 pub target: TargetSelection,
405 impl Step for StartupObjects {
406 type Output = Vec<(PathBuf, DependencyType)>;
408 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
409 run.path("library/rtstartup")
412 fn make_run(run: RunConfig<'_>) {
413 run.builder.ensure(StartupObjects {
414 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
419 /// Builds and prepare startup objects like rsbegin.o and rsend.o
421 /// These are primarily used on Windows right now for linking executables/dlls.
422 /// They don't require any library support as they're just plain old object
423 /// files, so we just use the nightly snapshot compiler to always build them (as
424 /// no other compilers are guaranteed to be available).
425 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
426 let for_compiler = self.compiler;
427 let target = self.target;
428 if !target.contains("windows-gnu") {
432 let mut target_deps = vec![];
434 let src_dir = &builder.src.join("library").join("rtstartup");
435 let dst_dir = &builder.native_dir(target).join("rtstartup");
436 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
437 t!(fs::create_dir_all(dst_dir));
439 for file in &["rsbegin", "rsend"] {
440 let src_file = &src_dir.join(file.to_string() + ".rs");
441 let dst_file = &dst_dir.join(file.to_string() + ".o");
442 if !up_to_date(src_file, dst_file) {
443 let mut cmd = Command::new(&builder.initial_rustc);
445 cmd.env("RUSTC_BOOTSTRAP", "1")
449 .arg(target.rustc_target_arg())
457 let target = sysroot_dir.join((*file).to_string() + ".o");
458 builder.copy(dst_file, &target);
459 target_deps.push((target, DependencyType::Target));
466 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
468 pub target: TargetSelection,
469 pub compiler: Compiler,
472 impl Step for Rustc {
474 const ONLY_HOSTS: bool = true;
475 const DEFAULT: bool = false;
477 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
478 run.path("compiler/rustc")
481 fn make_run(run: RunConfig<'_>) {
482 run.builder.ensure(Rustc {
483 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
488 /// Builds the compiler.
490 /// This will build the compiler for a particular stage of the build using
491 /// the `compiler` targeting the `target` architecture. The artifacts
492 /// created will also be linked into the sysroot directory.
493 fn run(self, builder: &Builder<'_>) {
494 let compiler = self.compiler;
495 let target = self.target;
497 builder.ensure(Std { compiler, target });
499 if builder.config.keep_stage.contains(&compiler.stage) {
500 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
501 builder.info("Warning: Use `--keep-stage-std` if you want to rebuild the compiler when it changes");
502 builder.ensure(RustcLink { compiler, target_compiler: compiler, target });
506 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
507 if compiler_to_use != compiler {
508 builder.ensure(Rustc { compiler: compiler_to_use, target });
510 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
511 builder.ensure(RustcLink {
512 compiler: compiler_to_use,
513 target_compiler: compiler,
519 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
521 compiler: builder.compiler(self.compiler.stage, builder.config.build),
522 target: builder.config.build,
525 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "build");
526 rustc_cargo(builder, &mut cargo, target);
528 if builder.config.rust_profile_use.is_some()
529 && builder.config.rust_profile_generate.is_some()
531 panic!("Cannot use and generate PGO profiles at the same time");
534 let is_collecting = if let Some(path) = &builder.config.rust_profile_generate {
535 if compiler.stage == 1 {
536 cargo.rustflag(&format!("-Cprofile-generate={}", path));
537 // Apparently necessary to avoid overflowing the counters during
538 // a Cargo build profile
539 cargo.rustflag("-Cllvm-args=-vp-counters-per-site=4");
544 } else if let Some(path) = &builder.config.rust_profile_use {
545 if compiler.stage == 1 {
546 cargo.rustflag(&format!("-Cprofile-use={}", path));
547 cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
556 // Ensure paths to Rust sources are relative, not absolute.
557 cargo.rustflag(&format!(
558 "-Cllvm-args=-static-func-strip-dirname-prefix={}",
559 builder.config.src.components().count()
563 builder.info(&format!(
564 "Building stage{} compiler artifacts ({} -> {})",
565 compiler.stage, &compiler.host, target
571 &librustc_stamp(builder, compiler, target),
576 builder.ensure(RustcLink {
577 compiler: builder.compiler(compiler.stage, builder.config.build),
578 target_compiler: compiler,
584 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
587 .arg(builder.rustc_features())
588 .arg("--manifest-path")
589 .arg(builder.src.join("compiler/rustc/Cargo.toml"));
590 rustc_cargo_env(builder, cargo, target);
593 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
594 // Set some configuration variables picked up by build scripts and
595 // the compiler alike
597 .env("CFG_RELEASE", builder.rust_release())
598 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
599 .env("CFG_VERSION", builder.rust_version())
600 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default());
602 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
603 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
605 if let Some(ref ver_date) = builder.rust_info.commit_date() {
606 cargo.env("CFG_VER_DATE", ver_date);
608 if let Some(ref ver_hash) = builder.rust_info.sha() {
609 cargo.env("CFG_VER_HASH", ver_hash);
611 if !builder.unstable_features() {
612 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
614 if let Some(ref s) = builder.config.rustc_default_linker {
615 cargo.env("CFG_DEFAULT_LINKER", s);
617 if builder.config.rustc_parallel {
618 cargo.rustflag("--cfg=parallel_compiler");
620 if builder.config.rust_verify_llvm_ir {
621 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
624 // Pass down configuration from the LLVM build into the build of
625 // rustc_llvm and rustc_codegen_llvm.
627 // Note that this is disabled if LLVM itself is disabled or we're in a check
628 // build. If we are in a check build we still go ahead here presuming we've
629 // detected that LLVM is alreay built and good to go which helps prevent
630 // busting caches (e.g. like #71152).
631 if builder.config.llvm_enabled()
632 && (builder.kind != Kind::Check
633 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
635 if builder.is_rust_llvm(target) {
636 cargo.env("LLVM_RUSTLLVM", "1");
638 let llvm_config = builder.ensure(native::Llvm { target });
639 cargo.env("LLVM_CONFIG", &llvm_config);
640 let target_config = builder.config.target_config.get(&target);
641 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
642 cargo.env("CFG_LLVM_ROOT", s);
644 // Some LLVM linker flags (-L and -l) may be needed to link rustc_llvm.
645 if let Some(ref s) = builder.config.llvm_ldflags {
646 cargo.env("LLVM_LINKER_FLAGS", s);
648 // Building with a static libstdc++ is only supported on linux right now,
649 // not for MSVC or macOS
650 if builder.config.llvm_static_stdcpp
651 && !target.contains("freebsd")
652 && !target.contains("msvc")
653 && !target.contains("apple")
655 let file = compiler_file(builder, builder.cxx(target).unwrap(), target, "libstdc++.a");
656 cargo.env("LLVM_STATIC_STDCPP", file);
658 if builder.config.llvm_link_shared {
659 cargo.env("LLVM_LINK_SHARED", "1");
661 if builder.config.llvm_use_libcxx {
662 cargo.env("LLVM_USE_LIBCXX", "1");
664 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
665 cargo.env("LLVM_NDEBUG", "1");
670 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
672 pub compiler: Compiler,
673 pub target_compiler: Compiler,
674 pub target: TargetSelection,
677 impl Step for RustcLink {
680 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
684 /// Same as `std_link`, only for librustc
685 fn run(self, builder: &Builder<'_>) {
686 let compiler = self.compiler;
687 let target_compiler = self.target_compiler;
688 let target = self.target;
689 builder.info(&format!(
690 "Copying stage{} rustc from stage{} ({} -> {} / {})",
691 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
695 &builder.sysroot_libdir(target_compiler, target),
696 &builder.sysroot_libdir(target_compiler, compiler.host),
697 &librustc_stamp(builder, compiler, target),
702 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
703 pub struct CodegenBackend {
704 pub target: TargetSelection,
705 pub compiler: Compiler,
706 pub backend: Interned<String>,
709 impl Step for CodegenBackend {
711 const ONLY_HOSTS: bool = true;
712 // Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
713 const DEFAULT: bool = true;
715 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
716 run.path("compiler/rustc_codegen_cranelift")
719 fn make_run(run: RunConfig<'_>) {
720 for &backend in &run.builder.config.rust_codegen_backends {
721 if backend == "llvm" {
722 continue; // Already built as part of rustc
725 run.builder.ensure(CodegenBackend {
727 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
733 fn run(self, builder: &Builder<'_>) {
734 let compiler = self.compiler;
735 let target = self.target;
736 let backend = self.backend;
738 builder.ensure(Rustc { compiler, target });
740 if builder.config.keep_stage.contains(&compiler.stage) {
742 "Warning: Using a potentially old codegen backend. \
743 This may not behave well.",
745 // Codegen backends are linked separately from this step today, so we don't do
750 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
751 if compiler_to_use != compiler {
752 builder.ensure(CodegenBackend { compiler: compiler_to_use, target, backend });
756 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
759 builder.cargo(compiler, Mode::Codegen, SourceType::Submodule, target, "build");
761 .arg("--manifest-path")
762 .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));
763 rustc_cargo_env(builder, &mut cargo, target);
765 let tmp_stamp = out_dir.join(".tmp.stamp");
767 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false);
768 if builder.config.dry_run {
771 let mut files = files.into_iter().filter(|f| {
772 let filename = f.file_name().unwrap().to_str().unwrap();
773 is_dylib(filename) && filename.contains("rustc_codegen_")
775 let codegen_backend = match files.next() {
777 None => panic!("no dylibs built for codegen backend?"),
779 if let Some(f) = files.next() {
781 "codegen backend built two dylibs:\n{}\n{}",
782 codegen_backend.display(),
786 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
787 let codegen_backend = codegen_backend.to_str().unwrap();
788 t!(fs::write(&stamp, &codegen_backend));
792 /// Creates the `codegen-backends` folder for a compiler that's about to be
793 /// assembled as a complete compiler.
795 /// This will take the codegen artifacts produced by `compiler` and link them
796 /// into an appropriate location for `target_compiler` to be a functional
798 fn copy_codegen_backends_to_sysroot(
799 builder: &Builder<'_>,
801 target_compiler: Compiler,
803 let target = target_compiler.host;
805 // Note that this step is different than all the other `*Link` steps in
806 // that it's not assembling a bunch of libraries but rather is primarily
807 // moving the codegen backend into place. The codegen backend of rustc is
808 // not linked into the main compiler by default but is rather dynamically
809 // selected at runtime for inclusion.
811 // Here we're looking for the output dylib of the `CodegenBackend` step and
812 // we're copying that into the `codegen-backends` folder.
813 let dst = builder.sysroot_codegen_backends(target_compiler);
814 t!(fs::create_dir_all(&dst), dst);
816 if builder.config.dry_run {
820 for backend in builder.config.rust_codegen_backends.iter() {
821 if backend == "llvm" {
822 continue; // Already built as part of rustc
825 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
826 let dylib = t!(fs::read_to_string(&stamp));
827 let file = Path::new(&dylib);
828 let filename = file.file_name().unwrap().to_str().unwrap();
829 // change `librustc_codegen_cranelift-xxxxxx.so` to
830 // `librustc_codegen_cranelift-release.so`
831 let target_filename = {
832 let dash = filename.find('-').unwrap();
833 let dot = filename.find('.').unwrap();
834 format!("{}-{}{}", &filename[..dash], builder.rust_release(), &filename[dot..])
836 builder.copy(&file, &dst.join(target_filename));
840 /// Cargo's output path for the standard library in a given stage, compiled
841 /// by a particular compiler for the specified target.
842 pub fn libstd_stamp(builder: &Builder<'_>, compiler: Compiler, target: TargetSelection) -> PathBuf {
843 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
846 /// Cargo's output path for librustc in a given stage, compiled by a particular
847 /// compiler for the specified target.
848 pub fn librustc_stamp(
849 builder: &Builder<'_>,
851 target: TargetSelection,
853 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
856 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
857 /// compiler for the specified target and backend.
858 fn codegen_backend_stamp(
859 builder: &Builder<'_>,
861 target: TargetSelection,
862 backend: Interned<String>,
865 .cargo_out(compiler, Mode::Codegen, target)
866 .join(format!(".librustc_codegen_{}.stamp", backend))
869 pub fn compiler_file(
870 builder: &Builder<'_>,
872 target: TargetSelection,
875 let mut cmd = Command::new(compiler);
876 cmd.args(builder.cflags(target, GitRepo::Rustc));
877 cmd.arg(format!("-print-file-name={}", file));
878 let out = output(&mut cmd);
879 PathBuf::from(out.trim())
882 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
884 pub compiler: Compiler,
887 impl Step for Sysroot {
888 type Output = Interned<PathBuf>;
890 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
894 /// Returns the sysroot for the `compiler` specified that *this build system
897 /// That is, the sysroot for the stage0 compiler is not what the compiler
898 /// thinks it is by default, but it's the same as the default for stages
900 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
901 let compiler = self.compiler;
902 let sysroot = if compiler.stage == 0 {
903 builder.out.join(&compiler.host.triple).join("stage0-sysroot")
905 builder.out.join(&compiler.host.triple).join(format!("stage{}", compiler.stage))
907 let _ = fs::remove_dir_all(&sysroot);
908 t!(fs::create_dir_all(&sysroot));
910 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
911 if builder.config.download_rustc {
913 builder.config.build, compiler.host,
914 "Cross-compiling is not yet supported with `download-rustc`",
916 // Copy the compiler into the correct sysroot.
917 let stage0_dir = builder.config.out.join(&*builder.config.build.triple).join("stage0");
918 builder.cp_r(&stage0_dir, &sysroot);
919 return INTERNER.intern_path(sysroot);
922 // Symlink the source root into the same location inside the sysroot,
923 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
924 // so that any tools relying on `rust-src` also work for local builds,
925 // and also for translating the virtual `/rustc/$hash` back to the real
926 // directory (for running tests with `rust.remap-debuginfo = true`).
927 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
928 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
929 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
930 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
932 "warning: creating symbolic link `{}` to `{}` failed with {}",
933 sysroot_lib_rustlib_src_rust.display(),
934 builder.src.display(),
937 if builder.config.rust_remap_debuginfo {
939 "warning: some `src/test/ui` tests will fail when lacking `{}`",
940 sysroot_lib_rustlib_src_rust.display(),
945 INTERNER.intern_path(sysroot)
949 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
950 pub struct Assemble {
951 /// The compiler which we will produce in this step. Assemble itself will
952 /// take care of ensuring that the necessary prerequisites to do so exist,
953 /// that is, this target can be a stage2 compiler and Assemble will build
954 /// previous stages for you.
955 pub target_compiler: Compiler,
958 impl Step for Assemble {
959 type Output = Compiler;
961 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
965 /// Prepare a new compiler from the artifacts in `stage`
967 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
968 /// must have been previously produced by the `stage - 1` builder.build
970 fn run(self, builder: &Builder<'_>) -> Compiler {
971 let target_compiler = self.target_compiler;
973 if target_compiler.stage == 0 {
975 builder.config.build, target_compiler.host,
976 "Cannot obtain compiler for non-native build triple at stage 0"
978 // The stage 0 compiler for the build triple is always pre-built.
979 return target_compiler;
982 // Get the compiler that we'll use to bootstrap ourselves.
984 // Note that this is where the recursive nature of the bootstrap
985 // happens, as this will request the previous stage's compiler on
986 // downwards to stage 0.
988 // Also note that we're building a compiler for the host platform. We
989 // only assume that we can run `build` artifacts, which means that to
990 // produce some other architecture compiler we need to start from
991 // `build` to get there.
993 // FIXME: It may be faster if we build just a stage 1 compiler and then
994 // use that to bootstrap this compiler forward.
995 let build_compiler = builder.compiler(target_compiler.stage - 1, builder.config.build);
997 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
998 if builder.config.download_rustc {
999 builder.ensure(Sysroot { compiler: target_compiler });
1000 return target_compiler;
1003 // Build the libraries for this compiler to link to (i.e., the libraries
1004 // it uses at runtime). NOTE: Crates the target compiler compiles don't
1005 // link to these. (FIXME: Is that correct? It seems to be correct most
1006 // of the time but I think we do link to these for stage2/bin compilers
1007 // when not performing a full bootstrap).
1008 builder.ensure(Rustc { compiler: build_compiler, target: target_compiler.host });
1010 for &backend in builder.config.rust_codegen_backends.iter() {
1011 if backend == "llvm" {
1012 continue; // Already built as part of rustc
1015 builder.ensure(CodegenBackend {
1016 compiler: build_compiler,
1017 target: target_compiler.host,
1022 let lld_install = if builder.config.lld_enabled {
1023 Some(builder.ensure(native::Lld { target: target_compiler.host }))
1028 let stage = target_compiler.stage;
1029 let host = target_compiler.host;
1030 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
1032 // Link in all dylibs to the libdir
1033 let stamp = librustc_stamp(builder, build_compiler, target_compiler.host);
1034 let proc_macros = builder
1035 .read_stamp_file(&stamp)
1037 .filter_map(|(path, dependency_type)| {
1038 if dependency_type == DependencyType::Host {
1039 Some(path.file_name().unwrap().to_owned().into_string().unwrap())
1044 .collect::<HashSet<_>>();
1046 let sysroot = builder.sysroot(target_compiler);
1047 let rustc_libdir = builder.rustc_libdir(target_compiler);
1048 t!(fs::create_dir_all(&rustc_libdir));
1049 let src_libdir = builder.sysroot_libdir(build_compiler, host);
1050 for f in builder.read_dir(&src_libdir) {
1051 let filename = f.file_name().into_string().unwrap();
1052 if is_dylib(&filename) && !proc_macros.contains(&filename) {
1053 builder.copy(&f.path(), &rustc_libdir.join(&filename));
1057 copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
1059 // We prepend this bin directory to the user PATH when linking Rust binaries. To
1060 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
1061 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
1062 let libdir_bin = libdir.parent().unwrap().join("bin");
1063 t!(fs::create_dir_all(&libdir_bin));
1065 if let Some(lld_install) = lld_install {
1066 let src_exe = exe("lld", target_compiler.host);
1067 let dst_exe = exe("rust-lld", target_compiler.host);
1068 builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
1071 // Similarly, copy `llvm-dwp` into libdir for Split DWARF. Only copy it when the LLVM
1072 // backend is used to avoid unnecessarily building LLVM and because LLVM is not checked
1073 // out by default when the LLVM backend is not enabled.
1074 if builder.config.rust_codegen_backends.contains(&INTERNER.intern_str("llvm")) {
1075 let src_exe = exe("llvm-dwp", target_compiler.host);
1076 let dst_exe = exe("rust-llvm-dwp", target_compiler.host);
1077 let llvm_config_bin = builder.ensure(native::Llvm { target: target_compiler.host });
1078 if !builder.config.dry_run {
1079 let llvm_bin_dir = output(Command::new(llvm_config_bin).arg("--bindir"));
1080 let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
1081 builder.copy(&llvm_bin_dir.join(&src_exe), &libdir_bin.join(&dst_exe));
1085 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
1086 // so that it can be found when the newly built `rustc` is run.
1087 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
1088 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
1090 // Link the compiler binary itself into place
1091 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1092 let rustc = out_dir.join(exe("rustc-main", host));
1093 let bindir = sysroot.join("bin");
1094 t!(fs::create_dir_all(&bindir));
1095 let compiler = builder.rustc(target_compiler);
1096 builder.copy(&rustc, &compiler);
1102 /// Link some files into a rustc sysroot.
1104 /// For a particular stage this will link the file listed in `stamp` into the
1105 /// `sysroot_dst` provided.
1106 pub fn add_to_sysroot(
1107 builder: &Builder<'_>,
1109 sysroot_host_dst: &Path,
1112 let self_contained_dst = &sysroot_dst.join("self-contained");
1113 t!(fs::create_dir_all(&sysroot_dst));
1114 t!(fs::create_dir_all(&sysroot_host_dst));
1115 t!(fs::create_dir_all(&self_contained_dst));
1116 for (path, dependency_type) in builder.read_stamp_file(stamp) {
1117 let dst = match dependency_type {
1118 DependencyType::Host => sysroot_host_dst,
1119 DependencyType::Target => sysroot_dst,
1120 DependencyType::TargetSelfContained => self_contained_dst,
1122 builder.copy(&path, &dst.join(path.file_name().unwrap()));
1127 builder: &Builder<'_>,
1129 tail_args: Vec<String>,
1131 additional_target_deps: Vec<(PathBuf, DependencyType)>,
1134 if builder.config.dry_run {
1138 // `target_root_dir` looks like $dir/$target/release
1139 let target_root_dir = stamp.parent().unwrap();
1140 // `target_deps_dir` looks like $dir/$target/release/deps
1141 let target_deps_dir = target_root_dir.join("deps");
1142 // `host_root_dir` looks like $dir/release
1143 let host_root_dir = target_root_dir
1145 .unwrap() // chop off `release`
1147 .unwrap() // chop off `$target`
1148 .join(target_root_dir.file_name().unwrap());
1150 // Spawn Cargo slurping up its JSON output. We'll start building up the
1151 // `deps` array of all files it generated along with a `toplevel` array of
1152 // files we need to probe for later.
1153 let mut deps = Vec::new();
1154 let mut toplevel = Vec::new();
1155 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1156 let (filenames, crate_types) = match msg {
1157 CargoMessage::CompilerArtifact {
1159 target: CargoTarget { crate_types },
1161 } => (filenames, crate_types),
1164 for filename in filenames {
1165 // Skip files like executables
1166 if !(filename.ends_with(".rlib")
1167 || filename.ends_with(".lib")
1168 || filename.ends_with(".a")
1169 || is_dylib(&filename)
1170 || (is_check && filename.ends_with(".rmeta")))
1175 let filename = Path::new(&*filename);
1177 // If this was an output file in the "host dir" we don't actually
1178 // worry about it, it's not relevant for us
1179 if filename.starts_with(&host_root_dir) {
1180 // Unless it's a proc macro used in the compiler
1181 if crate_types.iter().any(|t| t == "proc-macro") {
1182 deps.push((filename.to_path_buf(), DependencyType::Host));
1187 // If this was output in the `deps` dir then this is a precise file
1188 // name (hash included) so we start tracking it.
1189 if filename.starts_with(&target_deps_dir) {
1190 deps.push((filename.to_path_buf(), DependencyType::Target));
1194 // Otherwise this was a "top level artifact" which right now doesn't
1195 // have a hash in the name, but there's a version of this file in
1196 // the `deps` folder which *does* have a hash in the name. That's
1197 // the one we'll want to we'll probe for it later.
1199 // We do not use `Path::file_stem` or `Path::extension` here,
1200 // because some generated files may have multiple extensions e.g.
1201 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1202 // split the file name by the last extension (`.lib`) while we need
1203 // to split by all extensions (`.dll.lib`).
1204 let expected_len = t!(filename.metadata()).len();
1205 let filename = filename.file_name().unwrap().to_str().unwrap();
1206 let mut parts = filename.splitn(2, '.');
1207 let file_stem = parts.next().unwrap().to_owned();
1208 let extension = parts.next().unwrap().to_owned();
1210 toplevel.push((file_stem, extension, expected_len));
1218 // Ok now we need to actually find all the files listed in `toplevel`. We've
1219 // got a list of prefix/extensions and we basically just need to find the
1220 // most recent file in the `deps` folder corresponding to each one.
1221 let contents = t!(target_deps_dir.read_dir())
1223 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1224 .collect::<Vec<_>>();
1225 for (prefix, extension, expected_len) in toplevel {
1226 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1227 meta.len() == expected_len
1229 .strip_prefix(&prefix[..])
1230 .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
1233 let max = candidates
1234 .max_by_key(|&&(_, _, ref metadata)| FileTime::from_last_modification_time(metadata));
1235 let path_to_add = match max {
1236 Some(triple) => triple.0.to_str().unwrap(),
1237 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1239 if is_dylib(path_to_add) {
1240 let candidate = format!("{}.lib", path_to_add);
1241 let candidate = PathBuf::from(candidate);
1242 if candidate.exists() {
1243 deps.push((candidate, DependencyType::Target));
1246 deps.push((path_to_add.into(), DependencyType::Target));
1249 deps.extend(additional_target_deps);
1251 let mut new_contents = Vec::new();
1252 for (dep, dependency_type) in deps.iter() {
1253 new_contents.extend(match *dependency_type {
1254 DependencyType::Host => b"h",
1255 DependencyType::Target => b"t",
1256 DependencyType::TargetSelfContained => b"s",
1258 new_contents.extend(dep.to_str().unwrap().as_bytes());
1259 new_contents.extend(b"\0");
1261 t!(fs::write(&stamp, &new_contents));
1262 deps.into_iter().map(|(d, _)| d).collect()
1265 pub fn stream_cargo(
1266 builder: &Builder<'_>,
1268 tail_args: Vec<String>,
1269 cb: &mut dyn FnMut(CargoMessage<'_>),
1271 let mut cargo = Command::from(cargo);
1272 if builder.config.dry_run {
1275 // Instruct Cargo to give us json messages on stdout, critically leaving
1276 // stderr as piped so we can get those pretty colors.
1277 let mut message_format = if builder.config.json_output {
1278 String::from("json")
1280 String::from("json-render-diagnostics")
1282 if let Some(s) = &builder.config.rustc_error_format {
1283 message_format.push_str(",json-diagnostic-");
1284 message_format.push_str(s);
1286 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1288 for arg in tail_args {
1292 builder.verbose(&format!("running: {:?}", cargo));
1293 let mut child = match cargo.spawn() {
1295 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1298 // Spawn Cargo slurping up its JSON output. We'll start building up the
1299 // `deps` array of all files it generated along with a `toplevel` array of
1300 // files we need to probe for later.
1301 let stdout = BufReader::new(child.stdout.take().unwrap());
1302 for line in stdout.lines() {
1303 let line = t!(line);
1304 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1306 if builder.config.json_output {
1307 // Forward JSON to stdout.
1308 println!("{}", line);
1312 // If this was informational, just print it out and continue
1313 Err(_) => println!("{}", line),
1317 // Make sure Cargo actually succeeded after we read all of its stdout.
1318 let status = t!(child.wait());
1319 if !status.success() {
1321 "command did not execute successfully: {:?}\n\
1322 expected success, got: {}",
1329 #[derive(Deserialize)]
1330 pub struct CargoTarget<'a> {
1331 crate_types: Vec<Cow<'a, str>>,
1334 #[derive(Deserialize)]
1335 #[serde(tag = "reason", rename_all = "kebab-case")]
1336 pub enum CargoMessage<'a> {
1338 package_id: Cow<'a, str>,
1339 features: Vec<Cow<'a, str>>,
1340 filenames: Vec<Cow<'a, str>>,
1341 target: CargoTarget<'a>,
1343 BuildScriptExecuted {
1344 package_id: Cow<'a, str>,