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 if builder.config.download_rustc {
72 if builder.config.keep_stage.contains(&compiler.stage)
73 || builder.config.keep_stage_std.contains(&compiler.stage)
75 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
76 builder.ensure(StdLink { compiler, target_compiler: compiler, target });
80 let mut target_deps = builder.ensure(StartupObjects { compiler, target });
82 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
83 if compiler_to_use != compiler {
84 builder.ensure(Std { compiler: compiler_to_use, target });
85 builder.info(&format!("Uplifting stage1 std ({} -> {})", compiler_to_use.host, target));
87 // Even if we're not building std this stage, the new sysroot must
88 // still contain the third party objects needed by various targets.
89 copy_third_party_objects(builder, &compiler, target);
90 copy_self_contained_objects(builder, &compiler, target);
92 builder.ensure(StdLink {
93 compiler: compiler_to_use,
94 target_compiler: compiler,
100 target_deps.extend(copy_third_party_objects(builder, &compiler, target));
101 target_deps.extend(copy_self_contained_objects(builder, &compiler, target));
103 let mut cargo = builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "build");
104 std_cargo(builder, target, compiler.stage, &mut cargo);
106 builder.info(&format!(
107 "Building stage{} std artifacts ({} -> {})",
108 compiler.stage, &compiler.host, target
114 &libstd_stamp(builder, compiler, target),
119 builder.ensure(StdLink {
120 compiler: builder.compiler(compiler.stage, builder.config.build),
121 target_compiler: compiler,
128 builder: &Builder<'_>,
132 target_deps: &mut Vec<(PathBuf, DependencyType)>,
133 dependency_type: DependencyType,
135 let target = libdir.join(name);
136 builder.copy(&sourcedir.join(name), &target);
138 target_deps.push((target, dependency_type));
141 /// Copies third party objects needed by various targets.
142 fn copy_third_party_objects(
143 builder: &Builder<'_>,
145 target: TargetSelection,
146 ) -> Vec<(PathBuf, DependencyType)> {
147 let mut target_deps = vec![];
149 // FIXME: remove this in 2021
150 if target == "x86_64-fortanix-unknown-sgx" {
151 if env::var_os("X86_FORTANIX_SGX_LIBS").is_some() {
152 builder.info("Warning: X86_FORTANIX_SGX_LIBS environment variable is ignored, libunwind is now compiled as part of rustbuild");
156 if builder.config.sanitizers_enabled(target) && compiler.stage != 0 {
157 // The sanitizers are only copied in stage1 or above,
158 // to avoid creating dependency on LLVM.
160 copy_sanitizers(builder, &compiler, target)
162 .map(|d| (d, DependencyType::Target)),
169 /// Copies third party objects needed by various targets for self-contained linkage.
170 fn copy_self_contained_objects(
171 builder: &Builder<'_>,
173 target: TargetSelection,
174 ) -> Vec<(PathBuf, DependencyType)> {
175 let libdir_self_contained = builder.sysroot_libdir(*compiler, target).join("self-contained");
176 t!(fs::create_dir_all(&libdir_self_contained));
177 let mut target_deps = vec![];
179 // Copies the CRT objects.
181 // rustc historically provides a more self-contained installation for musl targets
182 // not requiring the presence of a native musl toolchain. For example, it can fall back
183 // to using gcc from a glibc-targeting toolchain for linking.
184 // To do that we have to distribute musl startup objects as a part of Rust toolchain
185 // and link with them manually in the self-contained mode.
186 if target.contains("musl") {
187 let srcdir = builder.musl_libdir(target).unwrap_or_else(|| {
188 panic!("Target {:?} does not have a \"musl-libdir\" key", target.triple)
190 for &obj in &["crt1.o", "Scrt1.o", "rcrt1.o", "crti.o", "crtn.o"] {
193 &libdir_self_contained,
197 DependencyType::TargetSelfContained,
200 for &obj in &["crtbegin.o", "crtbeginS.o", "crtend.o", "crtendS.o"] {
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));
206 } else if target.ends_with("-wasi") {
210 panic!("Target {:?} does not have a \"wasi-root\" key", target.triple)
212 .join("lib/wasm32-wasi");
213 for &obj in &["crt1-command.o", "crt1-reactor.o"] {
216 &libdir_self_contained,
220 DependencyType::TargetSelfContained,
223 } else if target.contains("windows-gnu") {
224 for obj in ["crt2.o", "dllcrt2.o"].iter() {
225 let src = compiler_file(builder, builder.cc(target), target, obj);
226 let target = libdir_self_contained.join(obj);
227 builder.copy(&src, &target);
228 target_deps.push((target, DependencyType::TargetSelfContained));
235 /// Configure cargo to compile the standard library, adding appropriate env vars
237 pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, cargo: &mut Cargo) {
238 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
239 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
242 // Determine if we're going to compile in optimized C intrinsics to
243 // the `compiler-builtins` crate. These intrinsics live in LLVM's
244 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
245 // always checked out, so we need to conditionally look for this. (e.g. if
246 // an external LLVM is used we skip the LLVM submodule checkout).
248 // Note that this shouldn't affect the correctness of `compiler-builtins`,
249 // but only its speed. Some intrinsics in C haven't been translated to Rust
250 // yet but that's pretty rare. Other intrinsics have optimized
251 // implementations in C which have only had slower versions ported to Rust,
252 // so we favor the C version where we can, but it's not critical.
254 // If `compiler-rt` is available ensure that the `c` feature of the
255 // `compiler-builtins` crate is enabled and it's configured to learn where
256 // `compiler-rt` is located.
257 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
258 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
259 // Note that `libprofiler_builtins/build.rs` also computes this so if
260 // you're changing something here please also change that.
261 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
262 " compiler-builtins-c"
267 if builder.no_std(target) == Some(true) {
268 let mut features = "compiler-builtins-mem".to_string();
269 features.push_str(compiler_builtins_c_feature);
271 // for no-std targets we only compile a few no_std crates
273 .args(&["-p", "alloc"])
274 .arg("--manifest-path")
275 .arg(builder.src.join("library/alloc/Cargo.toml"))
279 let mut features = builder.std_features(target);
280 features.push_str(compiler_builtins_c_feature);
285 .arg("--manifest-path")
286 .arg(builder.src.join("library/test/Cargo.toml"));
288 // Help the libc crate compile by assisting it in finding various
289 // sysroot native libraries.
290 if target.contains("musl") {
291 if let Some(p) = builder.musl_libdir(target) {
292 let root = format!("native={}", p.to_str().unwrap());
293 cargo.rustflag("-L").rustflag(&root);
297 if target.ends_with("-wasi") {
298 if let Some(p) = builder.wasi_root(target) {
299 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
300 cargo.rustflag("-L").rustflag(&root);
305 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
306 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
307 // built with bitcode so that the produced rlibs can be used for both LTO
308 // builds (which use bitcode) and non-LTO builds (which use object code).
309 // So we override the override here!
311 // But we don't bother for the stage 0 compiler because it's never used
314 cargo.rustflag("-Cembed-bitcode=yes");
317 // By default, rustc does not include unwind tables unless they are required
318 // for a particular target. They are not required by RISC-V targets, but
319 // compiling the standard library with them means that users can get
320 // backtraces without having to recompile the standard library themselves.
322 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
323 if target.contains("riscv") {
324 cargo.rustflag("-Cforce-unwind-tables=yes");
328 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
330 pub compiler: Compiler,
331 pub target_compiler: Compiler,
332 pub target: TargetSelection,
335 impl Step for StdLink {
338 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
342 /// Link all libstd rlibs/dylibs into the sysroot location.
344 /// Links those artifacts generated by `compiler` to the `stage` compiler's
345 /// sysroot for the specified `host` and `target`.
347 /// Note that this assumes that `compiler` has already generated the libstd
348 /// libraries for `target`, and this method will find them in the relevant
349 /// output directory.
350 fn run(self, builder: &Builder<'_>) {
351 let compiler = self.compiler;
352 let target_compiler = self.target_compiler;
353 let target = self.target;
354 builder.info(&format!(
355 "Copying stage{} std from stage{} ({} -> {} / {})",
356 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
358 let libdir = builder.sysroot_libdir(target_compiler, target);
359 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
360 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
364 /// Copies sanitizer runtime libraries into target libdir.
366 builder: &Builder<'_>,
368 target: TargetSelection,
370 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
372 if builder.config.dry_run {
376 let mut target_deps = Vec::new();
377 let libdir = builder.sysroot_libdir(*compiler, target);
379 for runtime in &runtimes {
380 let dst = libdir.join(&runtime.name);
381 builder.copy(&runtime.path, &dst);
383 if target == "x86_64-apple-darwin" || target == "aarch64-apple-darwin" {
384 // Update the library’s install name to reflect that it has has been renamed.
385 apple_darwin_update_library_name(&dst, &format!("@rpath/{}", &runtime.name));
386 // Upon renaming the install name, the code signature of the file will invalidate,
387 // so we will sign it again.
388 apple_darwin_sign_file(&dst);
391 target_deps.push(dst);
397 fn apple_darwin_update_library_name(library_path: &Path, new_name: &str) {
398 let status = Command::new("install_name_tool")
403 .expect("failed to execute `install_name_tool`");
404 assert!(status.success());
407 fn apple_darwin_sign_file(file_path: &Path) {
408 let status = Command::new("codesign")
409 .arg("-f") // Force to rewrite the existing signature
414 .expect("failed to execute `codesign`");
415 assert!(status.success());
418 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
419 pub struct StartupObjects {
420 pub compiler: Compiler,
421 pub target: TargetSelection,
424 impl Step for StartupObjects {
425 type Output = Vec<(PathBuf, DependencyType)>;
427 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
428 run.path("library/rtstartup")
431 fn make_run(run: RunConfig<'_>) {
432 run.builder.ensure(StartupObjects {
433 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
438 /// Builds and prepare startup objects like rsbegin.o and rsend.o
440 /// These are primarily used on Windows right now for linking executables/dlls.
441 /// They don't require any library support as they're just plain old object
442 /// files, so we just use the nightly snapshot compiler to always build them (as
443 /// no other compilers are guaranteed to be available).
444 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
445 let for_compiler = self.compiler;
446 let target = self.target;
447 if !target.contains("windows-gnu") {
451 let mut target_deps = vec![];
453 let src_dir = &builder.src.join("library").join("rtstartup");
454 let dst_dir = &builder.native_dir(target).join("rtstartup");
455 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
456 t!(fs::create_dir_all(dst_dir));
458 for file in &["rsbegin", "rsend"] {
459 let src_file = &src_dir.join(file.to_string() + ".rs");
460 let dst_file = &dst_dir.join(file.to_string() + ".o");
461 if !up_to_date(src_file, dst_file) {
462 let mut cmd = Command::new(&builder.initial_rustc);
464 cmd.env("RUSTC_BOOTSTRAP", "1")
468 .arg(target.rustc_target_arg())
476 let target = sysroot_dir.join((*file).to_string() + ".o");
477 builder.copy(dst_file, &target);
478 target_deps.push((target, DependencyType::Target));
485 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
487 pub target: TargetSelection,
488 pub compiler: Compiler,
491 impl Step for Rustc {
493 const ONLY_HOSTS: bool = true;
494 const DEFAULT: bool = false;
496 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
497 run.path("compiler/rustc")
500 fn make_run(run: RunConfig<'_>) {
501 run.builder.ensure(Rustc {
502 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
507 /// Builds the compiler.
509 /// This will build the compiler for a particular stage of the build using
510 /// the `compiler` targeting the `target` architecture. The artifacts
511 /// created will also be linked into the sysroot directory.
512 fn run(self, builder: &Builder<'_>) {
513 let compiler = self.compiler;
514 let target = self.target;
516 if builder.config.download_rustc {
517 // Copy the existing artifacts instead of rebuilding them.
518 // NOTE: this path is only taken for tools linking to rustc-dev.
519 builder.ensure(Sysroot { compiler });
523 builder.ensure(Std { compiler, target });
525 if builder.config.keep_stage.contains(&compiler.stage) {
526 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
527 builder.info("Warning: Use `--keep-stage-std` if you want to rebuild the compiler when it changes");
528 builder.ensure(RustcLink { compiler, target_compiler: compiler, target });
532 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
533 if compiler_to_use != compiler {
534 builder.ensure(Rustc { compiler: compiler_to_use, target });
536 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
537 builder.ensure(RustcLink {
538 compiler: compiler_to_use,
539 target_compiler: compiler,
545 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
547 compiler: builder.compiler(self.compiler.stage, builder.config.build),
548 target: builder.config.build,
551 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "build");
552 rustc_cargo(builder, &mut cargo, target);
554 if builder.config.rust_profile_use.is_some()
555 && builder.config.rust_profile_generate.is_some()
557 panic!("Cannot use and generate PGO profiles at the same time");
560 let is_collecting = if let Some(path) = &builder.config.rust_profile_generate {
561 if compiler.stage == 1 {
562 cargo.rustflag(&format!("-Cprofile-generate={}", path));
563 // Apparently necessary to avoid overflowing the counters during
564 // a Cargo build profile
565 cargo.rustflag("-Cllvm-args=-vp-counters-per-site=4");
570 } else if let Some(path) = &builder.config.rust_profile_use {
571 if compiler.stage == 1 {
572 cargo.rustflag(&format!("-Cprofile-use={}", path));
573 cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
582 // Ensure paths to Rust sources are relative, not absolute.
583 cargo.rustflag(&format!(
584 "-Cllvm-args=-static-func-strip-dirname-prefix={}",
585 builder.config.src.components().count()
589 builder.info(&format!(
590 "Building stage{} compiler artifacts ({} -> {})",
591 compiler.stage, &compiler.host, target
597 &librustc_stamp(builder, compiler, target),
602 builder.ensure(RustcLink {
603 compiler: builder.compiler(compiler.stage, builder.config.build),
604 target_compiler: compiler,
610 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
613 .arg(builder.rustc_features())
614 .arg("--manifest-path")
615 .arg(builder.src.join("compiler/rustc/Cargo.toml"));
616 rustc_cargo_env(builder, cargo, target);
619 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
620 // Set some configuration variables picked up by build scripts and
621 // the compiler alike
623 .env("CFG_RELEASE", builder.rust_release())
624 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
625 .env("CFG_VERSION", builder.rust_version())
626 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default());
628 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
629 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
631 if let Some(ref ver_date) = builder.rust_info.commit_date() {
632 cargo.env("CFG_VER_DATE", ver_date);
634 if let Some(ref ver_hash) = builder.rust_info.sha() {
635 cargo.env("CFG_VER_HASH", ver_hash);
637 if !builder.unstable_features() {
638 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
640 if let Some(ref s) = builder.config.rustc_default_linker {
641 cargo.env("CFG_DEFAULT_LINKER", s);
643 if builder.config.rustc_parallel {
644 cargo.rustflag("--cfg=parallel_compiler");
646 if builder.config.rust_verify_llvm_ir {
647 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
650 // Pass down configuration from the LLVM build into the build of
651 // rustc_llvm and rustc_codegen_llvm.
653 // Note that this is disabled if LLVM itself is disabled or we're in a check
654 // build. If we are in a check build we still go ahead here presuming we've
655 // detected that LLVM is alreay built and good to go which helps prevent
656 // busting caches (e.g. like #71152).
657 if builder.config.llvm_enabled()
658 && (builder.kind != Kind::Check
659 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
661 if builder.is_rust_llvm(target) {
662 cargo.env("LLVM_RUSTLLVM", "1");
664 let llvm_config = builder.ensure(native::Llvm { target });
665 cargo.env("LLVM_CONFIG", &llvm_config);
666 let target_config = builder.config.target_config.get(&target);
667 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
668 cargo.env("CFG_LLVM_ROOT", s);
670 // Some LLVM linker flags (-L and -l) may be needed to link rustc_llvm.
671 if let Some(ref s) = builder.config.llvm_ldflags {
672 cargo.env("LLVM_LINKER_FLAGS", s);
674 // Building with a static libstdc++ is only supported on linux right now,
675 // not for MSVC or macOS
676 if builder.config.llvm_static_stdcpp
677 && !target.contains("freebsd")
678 && !target.contains("msvc")
679 && !target.contains("apple")
681 let file = compiler_file(builder, builder.cxx(target).unwrap(), target, "libstdc++.a");
682 cargo.env("LLVM_STATIC_STDCPP", file);
684 if builder.config.llvm_link_shared {
685 cargo.env("LLVM_LINK_SHARED", "1");
687 if builder.config.llvm_use_libcxx {
688 cargo.env("LLVM_USE_LIBCXX", "1");
690 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
691 cargo.env("LLVM_NDEBUG", "1");
696 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
698 pub compiler: Compiler,
699 pub target_compiler: Compiler,
700 pub target: TargetSelection,
703 impl Step for RustcLink {
706 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
710 /// Same as `std_link`, only for librustc
711 fn run(self, builder: &Builder<'_>) {
712 let compiler = self.compiler;
713 let target_compiler = self.target_compiler;
714 let target = self.target;
715 builder.info(&format!(
716 "Copying stage{} rustc from stage{} ({} -> {} / {})",
717 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
721 &builder.sysroot_libdir(target_compiler, target),
722 &builder.sysroot_libdir(target_compiler, compiler.host),
723 &librustc_stamp(builder, compiler, target),
728 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
729 pub struct CodegenBackend {
730 pub target: TargetSelection,
731 pub compiler: Compiler,
732 pub backend: Interned<String>,
735 impl Step for CodegenBackend {
737 const ONLY_HOSTS: bool = true;
738 // Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
739 const DEFAULT: bool = true;
741 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
742 run.path("compiler/rustc_codegen_cranelift")
745 fn make_run(run: RunConfig<'_>) {
746 for &backend in &run.builder.config.rust_codegen_backends {
747 if backend == "llvm" {
748 continue; // Already built as part of rustc
751 run.builder.ensure(CodegenBackend {
753 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
759 fn run(self, builder: &Builder<'_>) {
760 let compiler = self.compiler;
761 let target = self.target;
762 let backend = self.backend;
764 builder.ensure(Rustc { compiler, target });
766 if builder.config.keep_stage.contains(&compiler.stage) {
768 "Warning: Using a potentially old codegen backend. \
769 This may not behave well.",
771 // Codegen backends are linked separately from this step today, so we don't do
776 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
777 if compiler_to_use != compiler {
778 builder.ensure(CodegenBackend { compiler: compiler_to_use, target, backend });
782 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
785 builder.cargo(compiler, Mode::Codegen, SourceType::Submodule, target, "build");
787 .arg("--manifest-path")
788 .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));
789 rustc_cargo_env(builder, &mut cargo, target);
791 let tmp_stamp = out_dir.join(".tmp.stamp");
793 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false);
794 if builder.config.dry_run {
797 let mut files = files.into_iter().filter(|f| {
798 let filename = f.file_name().unwrap().to_str().unwrap();
799 is_dylib(filename) && filename.contains("rustc_codegen_")
801 let codegen_backend = match files.next() {
803 None => panic!("no dylibs built for codegen backend?"),
805 if let Some(f) = files.next() {
807 "codegen backend built two dylibs:\n{}\n{}",
808 codegen_backend.display(),
812 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
813 let codegen_backend = codegen_backend.to_str().unwrap();
814 t!(fs::write(&stamp, &codegen_backend));
818 /// Creates the `codegen-backends` folder for a compiler that's about to be
819 /// assembled as a complete compiler.
821 /// This will take the codegen artifacts produced by `compiler` and link them
822 /// into an appropriate location for `target_compiler` to be a functional
824 fn copy_codegen_backends_to_sysroot(
825 builder: &Builder<'_>,
827 target_compiler: Compiler,
829 let target = target_compiler.host;
831 // Note that this step is different than all the other `*Link` steps in
832 // that it's not assembling a bunch of libraries but rather is primarily
833 // moving the codegen backend into place. The codegen backend of rustc is
834 // not linked into the main compiler by default but is rather dynamically
835 // selected at runtime for inclusion.
837 // Here we're looking for the output dylib of the `CodegenBackend` step and
838 // we're copying that into the `codegen-backends` folder.
839 let dst = builder.sysroot_codegen_backends(target_compiler);
840 t!(fs::create_dir_all(&dst), dst);
842 if builder.config.dry_run {
846 for backend in builder.config.rust_codegen_backends.iter() {
847 if backend == "llvm" {
848 continue; // Already built as part of rustc
851 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
852 let dylib = t!(fs::read_to_string(&stamp));
853 let file = Path::new(&dylib);
854 let filename = file.file_name().unwrap().to_str().unwrap();
855 // change `librustc_codegen_cranelift-xxxxxx.so` to
856 // `librustc_codegen_cranelift-release.so`
857 let target_filename = {
858 let dash = filename.find('-').unwrap();
859 let dot = filename.find('.').unwrap();
860 format!("{}-{}{}", &filename[..dash], builder.rust_release(), &filename[dot..])
862 builder.copy(&file, &dst.join(target_filename));
866 /// Cargo's output path for the standard library in a given stage, compiled
867 /// by a particular compiler for the specified target.
868 pub fn libstd_stamp(builder: &Builder<'_>, compiler: Compiler, target: TargetSelection) -> PathBuf {
869 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
872 /// Cargo's output path for librustc in a given stage, compiled by a particular
873 /// compiler for the specified target.
874 pub fn librustc_stamp(
875 builder: &Builder<'_>,
877 target: TargetSelection,
879 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
882 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
883 /// compiler for the specified target and backend.
884 fn codegen_backend_stamp(
885 builder: &Builder<'_>,
887 target: TargetSelection,
888 backend: Interned<String>,
891 .cargo_out(compiler, Mode::Codegen, target)
892 .join(format!(".librustc_codegen_{}.stamp", backend))
895 pub fn compiler_file(
896 builder: &Builder<'_>,
898 target: TargetSelection,
901 let mut cmd = Command::new(compiler);
902 cmd.args(builder.cflags(target, GitRepo::Rustc));
903 cmd.arg(format!("-print-file-name={}", file));
904 let out = output(&mut cmd);
905 PathBuf::from(out.trim())
908 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
910 pub compiler: Compiler,
913 impl Step for Sysroot {
914 type Output = Interned<PathBuf>;
916 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
920 /// Returns the sysroot for the `compiler` specified that *this build system
923 /// That is, the sysroot for the stage0 compiler is not what the compiler
924 /// thinks it is by default, but it's the same as the default for stages
926 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
927 let compiler = self.compiler;
928 let sysroot = if compiler.stage == 0 {
929 builder.out.join(&compiler.host.triple).join("stage0-sysroot")
931 builder.out.join(&compiler.host.triple).join(format!("stage{}", compiler.stage))
933 let _ = fs::remove_dir_all(&sysroot);
934 t!(fs::create_dir_all(&sysroot));
936 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
937 if builder.config.download_rustc {
939 builder.config.build, compiler.host,
940 "Cross-compiling is not yet supported with `download-rustc`",
942 // Copy the compiler into the correct sysroot.
943 let stage0_dir = builder.config.out.join(&*builder.config.build.triple).join("stage0");
944 builder.cp_r(&stage0_dir, &sysroot);
945 return INTERNER.intern_path(sysroot);
948 // Symlink the source root into the same location inside the sysroot,
949 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
950 // so that any tools relying on `rust-src` also work for local builds,
951 // and also for translating the virtual `/rustc/$hash` back to the real
952 // directory (for running tests with `rust.remap-debuginfo = true`).
953 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
954 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
955 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
956 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
958 "warning: creating symbolic link `{}` to `{}` failed with {}",
959 sysroot_lib_rustlib_src_rust.display(),
960 builder.src.display(),
963 if builder.config.rust_remap_debuginfo {
965 "warning: some `src/test/ui` tests will fail when lacking `{}`",
966 sysroot_lib_rustlib_src_rust.display(),
971 INTERNER.intern_path(sysroot)
975 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
976 pub struct Assemble {
977 /// The compiler which we will produce in this step. Assemble itself will
978 /// take care of ensuring that the necessary prerequisites to do so exist,
979 /// that is, this target can be a stage2 compiler and Assemble will build
980 /// previous stages for you.
981 pub target_compiler: Compiler,
984 impl Step for Assemble {
985 type Output = Compiler;
987 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
991 /// Prepare a new compiler from the artifacts in `stage`
993 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
994 /// must have been previously produced by the `stage - 1` builder.build
996 fn run(self, builder: &Builder<'_>) -> Compiler {
997 let target_compiler = self.target_compiler;
999 if target_compiler.stage == 0 {
1001 builder.config.build, target_compiler.host,
1002 "Cannot obtain compiler for non-native build triple at stage 0"
1004 // The stage 0 compiler for the build triple is always pre-built.
1005 return target_compiler;
1008 // Get the compiler that we'll use to bootstrap ourselves.
1010 // Note that this is where the recursive nature of the bootstrap
1011 // happens, as this will request the previous stage's compiler on
1012 // downwards to stage 0.
1014 // Also note that we're building a compiler for the host platform. We
1015 // only assume that we can run `build` artifacts, which means that to
1016 // produce some other architecture compiler we need to start from
1017 // `build` to get there.
1019 // FIXME: It may be faster if we build just a stage 1 compiler and then
1020 // use that to bootstrap this compiler forward.
1021 let build_compiler = builder.compiler(target_compiler.stage - 1, builder.config.build);
1023 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
1024 if builder.config.download_rustc {
1025 builder.ensure(Sysroot { compiler: target_compiler });
1026 return target_compiler;
1029 // Build the libraries for this compiler to link to (i.e., the libraries
1030 // it uses at runtime). NOTE: Crates the target compiler compiles don't
1031 // link to these. (FIXME: Is that correct? It seems to be correct most
1032 // of the time but I think we do link to these for stage2/bin compilers
1033 // when not performing a full bootstrap).
1034 builder.ensure(Rustc { compiler: build_compiler, target: target_compiler.host });
1036 for &backend in builder.config.rust_codegen_backends.iter() {
1037 if backend == "llvm" {
1038 continue; // Already built as part of rustc
1041 builder.ensure(CodegenBackend {
1042 compiler: build_compiler,
1043 target: target_compiler.host,
1048 let lld_install = if builder.config.lld_enabled {
1049 Some(builder.ensure(native::Lld { target: target_compiler.host }))
1054 let stage = target_compiler.stage;
1055 let host = target_compiler.host;
1056 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
1058 // Link in all dylibs to the libdir
1059 let stamp = librustc_stamp(builder, build_compiler, target_compiler.host);
1060 let proc_macros = builder
1061 .read_stamp_file(&stamp)
1063 .filter_map(|(path, dependency_type)| {
1064 if dependency_type == DependencyType::Host {
1065 Some(path.file_name().unwrap().to_owned().into_string().unwrap())
1070 .collect::<HashSet<_>>();
1072 let sysroot = builder.sysroot(target_compiler);
1073 let rustc_libdir = builder.rustc_libdir(target_compiler);
1074 t!(fs::create_dir_all(&rustc_libdir));
1075 let src_libdir = builder.sysroot_libdir(build_compiler, host);
1076 for f in builder.read_dir(&src_libdir) {
1077 let filename = f.file_name().into_string().unwrap();
1078 if (is_dylib(&filename) || is_debug_info(&filename)) && !proc_macros.contains(&filename)
1080 builder.copy(&f.path(), &rustc_libdir.join(&filename));
1084 copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
1086 // We prepend this bin directory to the user PATH when linking Rust binaries. To
1087 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
1088 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
1089 let libdir_bin = libdir.parent().unwrap().join("bin");
1090 t!(fs::create_dir_all(&libdir_bin));
1092 if let Some(lld_install) = lld_install {
1093 let src_exe = exe("lld", target_compiler.host);
1094 let dst_exe = exe("rust-lld", target_compiler.host);
1095 builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
1098 // Similarly, copy `llvm-dwp` into libdir for Split DWARF. Only copy it when the LLVM
1099 // backend is used to avoid unnecessarily building LLVM and because LLVM is not checked
1100 // out by default when the LLVM backend is not enabled.
1101 if builder.config.rust_codegen_backends.contains(&INTERNER.intern_str("llvm")) {
1102 let src_exe = exe("llvm-dwp", target_compiler.host);
1103 let dst_exe = exe("rust-llvm-dwp", target_compiler.host);
1104 let llvm_config_bin = builder.ensure(native::Llvm { target: target_compiler.host });
1105 if !builder.config.dry_run {
1106 let llvm_bin_dir = output(Command::new(llvm_config_bin).arg("--bindir"));
1107 let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
1108 builder.copy(&llvm_bin_dir.join(&src_exe), &libdir_bin.join(&dst_exe));
1112 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
1113 // so that it can be found when the newly built `rustc` is run.
1114 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
1115 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
1117 // Link the compiler binary itself into place
1118 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1119 let rustc = out_dir.join(exe("rustc-main", host));
1120 let bindir = sysroot.join("bin");
1121 t!(fs::create_dir_all(&bindir));
1122 let compiler = builder.rustc(target_compiler);
1123 builder.copy(&rustc, &compiler);
1129 /// Link some files into a rustc sysroot.
1131 /// For a particular stage this will link the file listed in `stamp` into the
1132 /// `sysroot_dst` provided.
1133 pub fn add_to_sysroot(
1134 builder: &Builder<'_>,
1136 sysroot_host_dst: &Path,
1139 let self_contained_dst = &sysroot_dst.join("self-contained");
1140 t!(fs::create_dir_all(&sysroot_dst));
1141 t!(fs::create_dir_all(&sysroot_host_dst));
1142 t!(fs::create_dir_all(&self_contained_dst));
1143 for (path, dependency_type) in builder.read_stamp_file(stamp) {
1144 let dst = match dependency_type {
1145 DependencyType::Host => sysroot_host_dst,
1146 DependencyType::Target => sysroot_dst,
1147 DependencyType::TargetSelfContained => self_contained_dst,
1149 builder.copy(&path, &dst.join(path.file_name().unwrap()));
1154 builder: &Builder<'_>,
1156 tail_args: Vec<String>,
1158 additional_target_deps: Vec<(PathBuf, DependencyType)>,
1161 if builder.config.dry_run {
1165 // `target_root_dir` looks like $dir/$target/release
1166 let target_root_dir = stamp.parent().unwrap();
1167 // `target_deps_dir` looks like $dir/$target/release/deps
1168 let target_deps_dir = target_root_dir.join("deps");
1169 // `host_root_dir` looks like $dir/release
1170 let host_root_dir = target_root_dir
1172 .unwrap() // chop off `release`
1174 .unwrap() // chop off `$target`
1175 .join(target_root_dir.file_name().unwrap());
1177 // Spawn Cargo slurping up its JSON output. We'll start building up the
1178 // `deps` array of all files it generated along with a `toplevel` array of
1179 // files we need to probe for later.
1180 let mut deps = Vec::new();
1181 let mut toplevel = Vec::new();
1182 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1183 let (filenames, crate_types) = match msg {
1184 CargoMessage::CompilerArtifact {
1186 target: CargoTarget { crate_types },
1188 } => (filenames, crate_types),
1191 for filename in filenames {
1192 // Skip files like executables
1193 if !(filename.ends_with(".rlib")
1194 || filename.ends_with(".lib")
1195 || filename.ends_with(".a")
1196 || is_debug_info(&filename)
1197 || is_dylib(&filename)
1198 || (is_check && filename.ends_with(".rmeta")))
1203 let filename = Path::new(&*filename);
1205 // If this was an output file in the "host dir" we don't actually
1206 // worry about it, it's not relevant for us
1207 if filename.starts_with(&host_root_dir) {
1208 // Unless it's a proc macro used in the compiler
1209 if crate_types.iter().any(|t| t == "proc-macro") {
1210 deps.push((filename.to_path_buf(), DependencyType::Host));
1215 // If this was output in the `deps` dir then this is a precise file
1216 // name (hash included) so we start tracking it.
1217 if filename.starts_with(&target_deps_dir) {
1218 deps.push((filename.to_path_buf(), DependencyType::Target));
1222 // Otherwise this was a "top level artifact" which right now doesn't
1223 // have a hash in the name, but there's a version of this file in
1224 // the `deps` folder which *does* have a hash in the name. That's
1225 // the one we'll want to we'll probe for it later.
1227 // We do not use `Path::file_stem` or `Path::extension` here,
1228 // because some generated files may have multiple extensions e.g.
1229 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1230 // split the file name by the last extension (`.lib`) while we need
1231 // to split by all extensions (`.dll.lib`).
1232 let expected_len = t!(filename.metadata()).len();
1233 let filename = filename.file_name().unwrap().to_str().unwrap();
1234 let mut parts = filename.splitn(2, '.');
1235 let file_stem = parts.next().unwrap().to_owned();
1236 let extension = parts.next().unwrap().to_owned();
1238 toplevel.push((file_stem, extension, expected_len));
1246 // Ok now we need to actually find all the files listed in `toplevel`. We've
1247 // got a list of prefix/extensions and we basically just need to find the
1248 // most recent file in the `deps` folder corresponding to each one.
1249 let contents = t!(target_deps_dir.read_dir())
1251 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1252 .collect::<Vec<_>>();
1253 for (prefix, extension, expected_len) in toplevel {
1254 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1255 meta.len() == expected_len
1257 .strip_prefix(&prefix[..])
1258 .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
1261 let max = candidates
1262 .max_by_key(|&&(_, _, ref metadata)| FileTime::from_last_modification_time(metadata));
1263 let path_to_add = match max {
1264 Some(triple) => triple.0.to_str().unwrap(),
1265 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1267 if is_dylib(path_to_add) {
1268 let candidate = format!("{}.lib", path_to_add);
1269 let candidate = PathBuf::from(candidate);
1270 if candidate.exists() {
1271 deps.push((candidate, DependencyType::Target));
1274 deps.push((path_to_add.into(), DependencyType::Target));
1277 deps.extend(additional_target_deps);
1279 let mut new_contents = Vec::new();
1280 for (dep, dependency_type) in deps.iter() {
1281 new_contents.extend(match *dependency_type {
1282 DependencyType::Host => b"h",
1283 DependencyType::Target => b"t",
1284 DependencyType::TargetSelfContained => b"s",
1286 new_contents.extend(dep.to_str().unwrap().as_bytes());
1287 new_contents.extend(b"\0");
1289 t!(fs::write(&stamp, &new_contents));
1290 deps.into_iter().map(|(d, _)| d).collect()
1293 pub fn stream_cargo(
1294 builder: &Builder<'_>,
1296 tail_args: Vec<String>,
1297 cb: &mut dyn FnMut(CargoMessage<'_>),
1299 let mut cargo = Command::from(cargo);
1300 if builder.config.dry_run {
1303 // Instruct Cargo to give us json messages on stdout, critically leaving
1304 // stderr as piped so we can get those pretty colors.
1305 let mut message_format = if builder.config.json_output {
1306 String::from("json")
1308 String::from("json-render-diagnostics")
1310 if let Some(s) = &builder.config.rustc_error_format {
1311 message_format.push_str(",json-diagnostic-");
1312 message_format.push_str(s);
1314 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1316 for arg in tail_args {
1320 builder.verbose(&format!("running: {:?}", cargo));
1321 let mut child = match cargo.spawn() {
1323 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1326 // Spawn Cargo slurping up its JSON output. We'll start building up the
1327 // `deps` array of all files it generated along with a `toplevel` array of
1328 // files we need to probe for later.
1329 let stdout = BufReader::new(child.stdout.take().unwrap());
1330 for line in stdout.lines() {
1331 let line = t!(line);
1332 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1334 if builder.config.json_output {
1335 // Forward JSON to stdout.
1336 println!("{}", line);
1340 // If this was informational, just print it out and continue
1341 Err(_) => println!("{}", line),
1345 // Make sure Cargo actually succeeded after we read all of its stdout.
1346 let status = t!(child.wait());
1347 if !status.success() {
1349 "command did not execute successfully: {:?}\n\
1350 expected success, got: {}",
1357 #[derive(Deserialize)]
1358 pub struct CargoTarget<'a> {
1359 crate_types: Vec<Cow<'a, str>>,
1362 #[derive(Deserialize)]
1363 #[serde(tag = "reason", rename_all = "kebab-case")]
1364 pub enum CargoMessage<'a> {
1366 package_id: Cow<'a, str>,
1367 features: Vec<Cow<'a, str>>,
1368 filenames: Vec<Cow<'a, str>>,
1369 target: CargoTarget<'a>,
1371 BuildScriptExecuted {
1372 package_id: Cow<'a, str>,