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 for &obj in &["crtbegin.o", "crtbeginS.o", "crtend.o", "crtendS.o"] {
203 let src = compiler_file(builder, builder.cc(target), target, obj);
204 let target = libdir_self_contained.join(obj);
205 builder.copy(&src, &target);
206 target_deps.push((target, DependencyType::TargetSelfContained));
208 } else if target.ends_with("-wasi") {
212 panic!("Target {:?} does not have a \"wasi-root\" key", target.triple)
214 .join("lib/wasm32-wasi");
215 for &obj in &["crt1-command.o", "crt1-reactor.o"] {
218 &libdir_self_contained,
222 DependencyType::TargetSelfContained,
225 } else if target.contains("windows-gnu") {
226 for obj in ["crt2.o", "dllcrt2.o"].iter() {
227 let src = compiler_file(builder, builder.cc(target), target, obj);
228 let target = libdir_self_contained.join(obj);
229 builder.copy(&src, &target);
230 target_deps.push((target, DependencyType::TargetSelfContained));
237 /// Configure cargo to compile the standard library, adding appropriate env vars
239 pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, cargo: &mut Cargo) {
240 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
241 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
244 // Determine if we're going to compile in optimized C intrinsics to
245 // the `compiler-builtins` crate. These intrinsics live in LLVM's
246 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
247 // always checked out, so we need to conditionally look for this. (e.g. if
248 // an external LLVM is used we skip the LLVM submodule checkout).
250 // Note that this shouldn't affect the correctness of `compiler-builtins`,
251 // but only its speed. Some intrinsics in C haven't been translated to Rust
252 // yet but that's pretty rare. Other intrinsics have optimized
253 // implementations in C which have only had slower versions ported to Rust,
254 // so we favor the C version where we can, but it's not critical.
256 // If `compiler-rt` is available ensure that the `c` feature of the
257 // `compiler-builtins` crate is enabled and it's configured to learn where
258 // `compiler-rt` is located.
259 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
260 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
261 // Note that `libprofiler_builtins/build.rs` also computes this so if
262 // you're changing something here please also change that.
263 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
264 " compiler-builtins-c"
269 if builder.no_std(target) == Some(true) {
270 let mut features = "compiler-builtins-mem".to_string();
271 features.push_str(compiler_builtins_c_feature);
273 // for no-std targets we only compile a few no_std crates
275 .args(&["-p", "alloc"])
276 .arg("--manifest-path")
277 .arg(builder.src.join("library/alloc/Cargo.toml"))
281 let mut features = builder.std_features(target);
282 features.push_str(compiler_builtins_c_feature);
287 .arg("--manifest-path")
288 .arg(builder.src.join("library/test/Cargo.toml"));
290 // Help the libc crate compile by assisting it in finding various
291 // sysroot native libraries.
292 if target.contains("musl") {
293 if let Some(p) = builder.musl_libdir(target) {
294 let root = format!("native={}", p.to_str().unwrap());
295 cargo.rustflag("-L").rustflag(&root);
299 if target.ends_with("-wasi") {
300 if let Some(p) = builder.wasi_root(target) {
301 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
302 cargo.rustflag("-L").rustflag(&root);
307 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
308 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
309 // built with bitcode so that the produced rlibs can be used for both LTO
310 // builds (which use bitcode) and non-LTO builds (which use object code).
311 // So we override the override here!
313 // But we don't bother for the stage 0 compiler because it's never used
316 cargo.rustflag("-Cembed-bitcode=yes");
319 // By default, rustc does not include unwind tables unless they are required
320 // for a particular target. They are not required by RISC-V targets, but
321 // compiling the standard library with them means that users can get
322 // backtraces without having to recompile the standard library themselves.
324 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
325 if target.contains("riscv") {
326 cargo.rustflag("-Cforce-unwind-tables=yes");
330 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
332 pub compiler: Compiler,
333 pub target_compiler: Compiler,
334 pub target: TargetSelection,
337 impl Step for StdLink {
340 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
344 /// Link all libstd rlibs/dylibs into the sysroot location.
346 /// Links those artifacts generated by `compiler` to the `stage` compiler's
347 /// sysroot for the specified `host` and `target`.
349 /// Note that this assumes that `compiler` has already generated the libstd
350 /// libraries for `target`, and this method will find them in the relevant
351 /// output directory.
352 fn run(self, builder: &Builder<'_>) {
353 let compiler = self.compiler;
354 let target_compiler = self.target_compiler;
355 let target = self.target;
356 builder.info(&format!(
357 "Copying stage{} std from stage{} ({} -> {} / {})",
358 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
360 let libdir = builder.sysroot_libdir(target_compiler, target);
361 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
362 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
366 /// Copies sanitizer runtime libraries into target libdir.
368 builder: &Builder<'_>,
370 target: TargetSelection,
372 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
374 if builder.config.dry_run {
378 let mut target_deps = Vec::new();
379 let libdir = builder.sysroot_libdir(*compiler, target);
381 for runtime in &runtimes {
382 let dst = libdir.join(&runtime.name);
383 builder.copy(&runtime.path, &dst);
385 if target == "x86_64-apple-darwin" || target == "aarch64-apple-darwin" {
386 // Update the library’s install name to reflect that it has has been renamed.
387 apple_darwin_update_library_name(&dst, &format!("@rpath/{}", &runtime.name));
388 // Upon renaming the install name, the code signature of the file will invalidate,
389 // so we will sign it again.
390 apple_darwin_sign_file(&dst);
393 target_deps.push(dst);
399 fn apple_darwin_update_library_name(library_path: &Path, new_name: &str) {
400 let status = Command::new("install_name_tool")
405 .expect("failed to execute `install_name_tool`");
406 assert!(status.success());
409 fn apple_darwin_sign_file(file_path: &Path) {
410 let status = Command::new("codesign")
411 .arg("-f") // Force to rewrite the existing signature
416 .expect("failed to execute `codesign`");
417 assert!(status.success());
420 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
421 pub struct StartupObjects {
422 pub compiler: Compiler,
423 pub target: TargetSelection,
426 impl Step for StartupObjects {
427 type Output = Vec<(PathBuf, DependencyType)>;
429 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
430 run.path("library/rtstartup")
433 fn make_run(run: RunConfig<'_>) {
434 run.builder.ensure(StartupObjects {
435 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
440 /// Builds and prepare startup objects like rsbegin.o and rsend.o
442 /// These are primarily used on Windows right now for linking executables/dlls.
443 /// They don't require any library support as they're just plain old object
444 /// files, so we just use the nightly snapshot compiler to always build them (as
445 /// no other compilers are guaranteed to be available).
446 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
447 let for_compiler = self.compiler;
448 let target = self.target;
449 if !target.contains("windows-gnu") {
453 let mut target_deps = vec![];
455 let src_dir = &builder.src.join("library").join("rtstartup");
456 let dst_dir = &builder.native_dir(target).join("rtstartup");
457 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
458 t!(fs::create_dir_all(dst_dir));
460 for file in &["rsbegin", "rsend"] {
461 let src_file = &src_dir.join(file.to_string() + ".rs");
462 let dst_file = &dst_dir.join(file.to_string() + ".o");
463 if !up_to_date(src_file, dst_file) {
464 let mut cmd = Command::new(&builder.initial_rustc);
466 cmd.env("RUSTC_BOOTSTRAP", "1")
470 .arg(target.rustc_target_arg())
478 let target = sysroot_dir.join((*file).to_string() + ".o");
479 builder.copy(dst_file, &target);
480 target_deps.push((target, DependencyType::Target));
487 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
489 pub target: TargetSelection,
490 pub compiler: Compiler,
493 impl Step for Rustc {
495 const ONLY_HOSTS: bool = true;
496 const DEFAULT: bool = false;
498 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
499 run.path("compiler/rustc")
502 fn make_run(run: RunConfig<'_>) {
503 run.builder.ensure(Rustc {
504 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
509 /// Builds the compiler.
511 /// This will build the compiler for a particular stage of the build using
512 /// the `compiler` targeting the `target` architecture. The artifacts
513 /// created will also be linked into the sysroot directory.
514 fn run(self, builder: &Builder<'_>) {
515 let compiler = self.compiler;
516 let target = self.target;
518 // NOTE: the ABI of the beta compiler is different from the ABI of the downloaded compiler,
519 // so its artifacts can't be reused.
520 if builder.config.download_rustc && compiler.stage != 0 {
521 // Copy the existing artifacts instead of rebuilding them.
522 // NOTE: this path is only taken for tools linking to rustc-dev.
523 builder.ensure(Sysroot { compiler });
527 builder.ensure(Std { compiler, target });
529 if builder.config.keep_stage.contains(&compiler.stage) {
530 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
531 builder.info("Warning: Use `--keep-stage-std` if you want to rebuild the compiler when it changes");
532 builder.ensure(RustcLink { compiler, target_compiler: compiler, target });
536 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
537 if compiler_to_use != compiler {
538 builder.ensure(Rustc { compiler: compiler_to_use, target });
540 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
541 builder.ensure(RustcLink {
542 compiler: compiler_to_use,
543 target_compiler: compiler,
549 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
551 compiler: builder.compiler(self.compiler.stage, builder.config.build),
552 target: builder.config.build,
555 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "build");
556 rustc_cargo(builder, &mut cargo, target);
558 if builder.config.rust_profile_use.is_some()
559 && builder.config.rust_profile_generate.is_some()
561 panic!("Cannot use and generate PGO profiles at the same time");
564 let is_collecting = if let Some(path) = &builder.config.rust_profile_generate {
565 if compiler.stage == 1 {
566 cargo.rustflag(&format!("-Cprofile-generate={}", path));
567 // Apparently necessary to avoid overflowing the counters during
568 // a Cargo build profile
569 cargo.rustflag("-Cllvm-args=-vp-counters-per-site=4");
574 } else if let Some(path) = &builder.config.rust_profile_use {
575 if compiler.stage == 1 {
576 cargo.rustflag(&format!("-Cprofile-use={}", path));
577 cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
586 // Ensure paths to Rust sources are relative, not absolute.
587 cargo.rustflag(&format!(
588 "-Cllvm-args=-static-func-strip-dirname-prefix={}",
589 builder.config.src.components().count()
593 builder.info(&format!(
594 "Building stage{} compiler artifacts ({} -> {})",
595 compiler.stage, &compiler.host, target
601 &librustc_stamp(builder, compiler, target),
606 builder.ensure(RustcLink {
607 compiler: builder.compiler(compiler.stage, builder.config.build),
608 target_compiler: compiler,
614 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
617 .arg(builder.rustc_features())
618 .arg("--manifest-path")
619 .arg(builder.src.join("compiler/rustc/Cargo.toml"));
620 rustc_cargo_env(builder, cargo, target);
623 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
624 // Set some configuration variables picked up by build scripts and
625 // the compiler alike
627 .env("CFG_RELEASE", builder.rust_release())
628 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
629 .env("CFG_VERSION", builder.rust_version())
630 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default());
632 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
633 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
635 if let Some(ref ver_date) = builder.rust_info.commit_date() {
636 cargo.env("CFG_VER_DATE", ver_date);
638 if let Some(ref ver_hash) = builder.rust_info.sha() {
639 cargo.env("CFG_VER_HASH", ver_hash);
641 if !builder.unstable_features() {
642 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
644 if let Some(ref s) = builder.config.rustc_default_linker {
645 cargo.env("CFG_DEFAULT_LINKER", s);
647 if builder.config.rustc_parallel {
648 cargo.rustflag("--cfg=parallel_compiler");
650 if builder.config.rust_verify_llvm_ir {
651 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
654 // Pass down configuration from the LLVM build into the build of
655 // rustc_llvm and rustc_codegen_llvm.
657 // Note that this is disabled if LLVM itself is disabled or we're in a check
658 // build. If we are in a check build we still go ahead here presuming we've
659 // detected that LLVM is alreay built and good to go which helps prevent
660 // busting caches (e.g. like #71152).
661 if builder.config.llvm_enabled()
662 && (builder.kind != Kind::Check
663 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
665 if builder.is_rust_llvm(target) {
666 cargo.env("LLVM_RUSTLLVM", "1");
668 let llvm_config = builder.ensure(native::Llvm { target });
669 cargo.env("LLVM_CONFIG", &llvm_config);
670 let target_config = builder.config.target_config.get(&target);
671 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
672 cargo.env("CFG_LLVM_ROOT", s);
674 // Some LLVM linker flags (-L and -l) may be needed to link rustc_llvm.
675 if let Some(ref s) = builder.config.llvm_ldflags {
676 cargo.env("LLVM_LINKER_FLAGS", s);
678 // Building with a static libstdc++ is only supported on linux right now,
679 // not for MSVC or macOS
680 if builder.config.llvm_static_stdcpp
681 && !target.contains("freebsd")
682 && !target.contains("msvc")
683 && !target.contains("apple")
685 let file = compiler_file(builder, builder.cxx(target).unwrap(), target, "libstdc++.a");
686 cargo.env("LLVM_STATIC_STDCPP", file);
688 if builder.config.llvm_link_shared {
689 cargo.env("LLVM_LINK_SHARED", "1");
691 if builder.config.llvm_use_libcxx {
692 cargo.env("LLVM_USE_LIBCXX", "1");
694 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
695 cargo.env("LLVM_NDEBUG", "1");
700 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
702 pub compiler: Compiler,
703 pub target_compiler: Compiler,
704 pub target: TargetSelection,
707 impl Step for RustcLink {
710 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
714 /// Same as `std_link`, only for librustc
715 fn run(self, builder: &Builder<'_>) {
716 let compiler = self.compiler;
717 let target_compiler = self.target_compiler;
718 let target = self.target;
719 builder.info(&format!(
720 "Copying stage{} rustc from stage{} ({} -> {} / {})",
721 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
725 &builder.sysroot_libdir(target_compiler, target),
726 &builder.sysroot_libdir(target_compiler, compiler.host),
727 &librustc_stamp(builder, compiler, target),
732 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
733 pub struct CodegenBackend {
734 pub target: TargetSelection,
735 pub compiler: Compiler,
736 pub backend: Interned<String>,
739 impl Step for CodegenBackend {
741 const ONLY_HOSTS: bool = true;
742 // Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
743 const DEFAULT: bool = true;
745 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
746 run.path("compiler/rustc_codegen_cranelift")
749 fn make_run(run: RunConfig<'_>) {
750 for &backend in &run.builder.config.rust_codegen_backends {
751 if backend == "llvm" {
752 continue; // Already built as part of rustc
755 run.builder.ensure(CodegenBackend {
757 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
763 fn run(self, builder: &Builder<'_>) {
764 let compiler = self.compiler;
765 let target = self.target;
766 let backend = self.backend;
768 builder.ensure(Rustc { compiler, target });
770 if builder.config.keep_stage.contains(&compiler.stage) {
772 "Warning: Using a potentially old codegen backend. \
773 This may not behave well.",
775 // Codegen backends are linked separately from this step today, so we don't do
780 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
781 if compiler_to_use != compiler {
782 builder.ensure(CodegenBackend { compiler: compiler_to_use, target, backend });
786 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
789 builder.cargo(compiler, Mode::Codegen, SourceType::Submodule, target, "build");
791 .arg("--manifest-path")
792 .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));
793 rustc_cargo_env(builder, &mut cargo, target);
795 let tmp_stamp = out_dir.join(".tmp.stamp");
797 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false);
798 if builder.config.dry_run {
801 let mut files = files.into_iter().filter(|f| {
802 let filename = f.file_name().unwrap().to_str().unwrap();
803 is_dylib(filename) && filename.contains("rustc_codegen_")
805 let codegen_backend = match files.next() {
807 None => panic!("no dylibs built for codegen backend?"),
809 if let Some(f) = files.next() {
811 "codegen backend built two dylibs:\n{}\n{}",
812 codegen_backend.display(),
816 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
817 let codegen_backend = codegen_backend.to_str().unwrap();
818 t!(fs::write(&stamp, &codegen_backend));
822 /// Creates the `codegen-backends` folder for a compiler that's about to be
823 /// assembled as a complete compiler.
825 /// This will take the codegen artifacts produced by `compiler` and link them
826 /// into an appropriate location for `target_compiler` to be a functional
828 fn copy_codegen_backends_to_sysroot(
829 builder: &Builder<'_>,
831 target_compiler: Compiler,
833 let target = target_compiler.host;
835 // Note that this step is different than all the other `*Link` steps in
836 // that it's not assembling a bunch of libraries but rather is primarily
837 // moving the codegen backend into place. The codegen backend of rustc is
838 // not linked into the main compiler by default but is rather dynamically
839 // selected at runtime for inclusion.
841 // Here we're looking for the output dylib of the `CodegenBackend` step and
842 // we're copying that into the `codegen-backends` folder.
843 let dst = builder.sysroot_codegen_backends(target_compiler);
844 t!(fs::create_dir_all(&dst), dst);
846 if builder.config.dry_run {
850 for backend in builder.config.rust_codegen_backends.iter() {
851 if backend == "llvm" {
852 continue; // Already built as part of rustc
855 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
856 let dylib = t!(fs::read_to_string(&stamp));
857 let file = Path::new(&dylib);
858 let filename = file.file_name().unwrap().to_str().unwrap();
859 // change `librustc_codegen_cranelift-xxxxxx.so` to
860 // `librustc_codegen_cranelift-release.so`
861 let target_filename = {
862 let dash = filename.find('-').unwrap();
863 let dot = filename.find('.').unwrap();
864 format!("{}-{}{}", &filename[..dash], builder.rust_release(), &filename[dot..])
866 builder.copy(&file, &dst.join(target_filename));
870 /// Cargo's output path for the standard library in a given stage, compiled
871 /// by a particular compiler for the specified target.
872 pub fn libstd_stamp(builder: &Builder<'_>, compiler: Compiler, target: TargetSelection) -> PathBuf {
873 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
876 /// Cargo's output path for librustc in a given stage, compiled by a particular
877 /// compiler for the specified target.
878 pub fn librustc_stamp(
879 builder: &Builder<'_>,
881 target: TargetSelection,
883 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
886 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
887 /// compiler for the specified target and backend.
888 fn codegen_backend_stamp(
889 builder: &Builder<'_>,
891 target: TargetSelection,
892 backend: Interned<String>,
895 .cargo_out(compiler, Mode::Codegen, target)
896 .join(format!(".librustc_codegen_{}.stamp", backend))
899 pub fn compiler_file(
900 builder: &Builder<'_>,
902 target: TargetSelection,
905 let mut cmd = Command::new(compiler);
906 cmd.args(builder.cflags(target, GitRepo::Rustc));
907 cmd.arg(format!("-print-file-name={}", file));
908 let out = output(&mut cmd);
909 PathBuf::from(out.trim())
912 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
914 pub compiler: Compiler,
917 impl Step for Sysroot {
918 type Output = Interned<PathBuf>;
920 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
924 /// Returns the sysroot for the `compiler` specified that *this build system
927 /// That is, the sysroot for the stage0 compiler is not what the compiler
928 /// thinks it is by default, but it's the same as the default for stages
930 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
931 let compiler = self.compiler;
932 let sysroot = if compiler.stage == 0 {
933 builder.out.join(&compiler.host.triple).join("stage0-sysroot")
935 builder.out.join(&compiler.host.triple).join(format!("stage{}", compiler.stage))
937 let _ = fs::remove_dir_all(&sysroot);
938 t!(fs::create_dir_all(&sysroot));
940 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
941 if builder.config.download_rustc && compiler.stage != 0 {
943 builder.config.build, compiler.host,
944 "Cross-compiling is not yet supported with `download-rustc`",
946 // Copy the compiler into the correct sysroot.
948 builder.config.out.join(&*builder.config.build.triple).join("ci-rustc");
949 builder.cp_r(&ci_rustc_dir, &sysroot);
950 return INTERNER.intern_path(sysroot);
953 // Symlink the source root into the same location inside the sysroot,
954 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
955 // so that any tools relying on `rust-src` also work for local builds,
956 // and also for translating the virtual `/rustc/$hash` back to the real
957 // directory (for running tests with `rust.remap-debuginfo = true`).
958 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
959 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
960 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
961 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
963 "warning: creating symbolic link `{}` to `{}` failed with {}",
964 sysroot_lib_rustlib_src_rust.display(),
965 builder.src.display(),
968 if builder.config.rust_remap_debuginfo {
970 "warning: some `src/test/ui` tests will fail when lacking `{}`",
971 sysroot_lib_rustlib_src_rust.display(),
976 INTERNER.intern_path(sysroot)
980 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
981 pub struct Assemble {
982 /// The compiler which we will produce in this step. Assemble itself will
983 /// take care of ensuring that the necessary prerequisites to do so exist,
984 /// that is, this target can be a stage2 compiler and Assemble will build
985 /// previous stages for you.
986 pub target_compiler: Compiler,
989 impl Step for Assemble {
990 type Output = Compiler;
992 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
996 /// Prepare a new compiler from the artifacts in `stage`
998 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
999 /// must have been previously produced by the `stage - 1` builder.build
1001 fn run(self, builder: &Builder<'_>) -> Compiler {
1002 let target_compiler = self.target_compiler;
1004 if target_compiler.stage == 0 {
1006 builder.config.build, target_compiler.host,
1007 "Cannot obtain compiler for non-native build triple at stage 0"
1009 // The stage 0 compiler for the build triple is always pre-built.
1010 return target_compiler;
1013 // Get the compiler that we'll use to bootstrap ourselves.
1015 // Note that this is where the recursive nature of the bootstrap
1016 // happens, as this will request the previous stage's compiler on
1017 // downwards to stage 0.
1019 // Also note that we're building a compiler for the host platform. We
1020 // only assume that we can run `build` artifacts, which means that to
1021 // produce some other architecture compiler we need to start from
1022 // `build` to get there.
1024 // FIXME: It may be faster if we build just a stage 1 compiler and then
1025 // use that to bootstrap this compiler forward.
1026 let build_compiler = builder.compiler(target_compiler.stage - 1, builder.config.build);
1028 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
1029 if builder.config.download_rustc {
1030 builder.ensure(Sysroot { compiler: target_compiler });
1031 return target_compiler;
1034 // Build the libraries for this compiler to link to (i.e., the libraries
1035 // it uses at runtime). NOTE: Crates the target compiler compiles don't
1036 // link to these. (FIXME: Is that correct? It seems to be correct most
1037 // of the time but I think we do link to these for stage2/bin compilers
1038 // when not performing a full bootstrap).
1039 builder.ensure(Rustc { compiler: build_compiler, target: target_compiler.host });
1041 for &backend in builder.config.rust_codegen_backends.iter() {
1042 if backend == "llvm" {
1043 continue; // Already built as part of rustc
1046 builder.ensure(CodegenBackend {
1047 compiler: build_compiler,
1048 target: target_compiler.host,
1053 let lld_install = if builder.config.lld_enabled {
1054 Some(builder.ensure(native::Lld { target: target_compiler.host }))
1059 let stage = target_compiler.stage;
1060 let host = target_compiler.host;
1061 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
1063 // Link in all dylibs to the libdir
1064 let stamp = librustc_stamp(builder, build_compiler, target_compiler.host);
1065 let proc_macros = builder
1066 .read_stamp_file(&stamp)
1068 .filter_map(|(path, dependency_type)| {
1069 if dependency_type == DependencyType::Host {
1070 Some(path.file_name().unwrap().to_owned().into_string().unwrap())
1075 .collect::<HashSet<_>>();
1077 let sysroot = builder.sysroot(target_compiler);
1078 let rustc_libdir = builder.rustc_libdir(target_compiler);
1079 t!(fs::create_dir_all(&rustc_libdir));
1080 let src_libdir = builder.sysroot_libdir(build_compiler, host);
1081 for f in builder.read_dir(&src_libdir) {
1082 let filename = f.file_name().into_string().unwrap();
1083 if (is_dylib(&filename) || is_debug_info(&filename)) && !proc_macros.contains(&filename)
1085 builder.copy(&f.path(), &rustc_libdir.join(&filename));
1089 copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
1091 // We prepend this bin directory to the user PATH when linking Rust binaries. To
1092 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
1093 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
1094 let libdir_bin = libdir.parent().unwrap().join("bin");
1095 t!(fs::create_dir_all(&libdir_bin));
1097 if let Some(lld_install) = lld_install {
1098 let src_exe = exe("lld", target_compiler.host);
1099 let dst_exe = exe("rust-lld", target_compiler.host);
1100 builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
1103 // Similarly, copy `llvm-dwp` into libdir for Split DWARF. Only copy it when the LLVM
1104 // backend is used to avoid unnecessarily building LLVM and because LLVM is not checked
1105 // out by default when the LLVM backend is not enabled.
1106 if builder.config.rust_codegen_backends.contains(&INTERNER.intern_str("llvm")) {
1107 let src_exe = exe("llvm-dwp", target_compiler.host);
1108 let dst_exe = exe("rust-llvm-dwp", target_compiler.host);
1109 let llvm_config_bin = builder.ensure(native::Llvm { target: target_compiler.host });
1110 if !builder.config.dry_run {
1111 let llvm_bin_dir = output(Command::new(llvm_config_bin).arg("--bindir"));
1112 let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
1113 builder.copy(&llvm_bin_dir.join(&src_exe), &libdir_bin.join(&dst_exe));
1117 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
1118 // so that it can be found when the newly built `rustc` is run.
1119 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
1120 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
1122 // Link the compiler binary itself into place
1123 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1124 let rustc = out_dir.join(exe("rustc-main", host));
1125 let bindir = sysroot.join("bin");
1126 t!(fs::create_dir_all(&bindir));
1127 let compiler = builder.rustc(target_compiler);
1128 builder.copy(&rustc, &compiler);
1134 /// Link some files into a rustc sysroot.
1136 /// For a particular stage this will link the file listed in `stamp` into the
1137 /// `sysroot_dst` provided.
1138 pub fn add_to_sysroot(
1139 builder: &Builder<'_>,
1141 sysroot_host_dst: &Path,
1144 let self_contained_dst = &sysroot_dst.join("self-contained");
1145 t!(fs::create_dir_all(&sysroot_dst));
1146 t!(fs::create_dir_all(&sysroot_host_dst));
1147 t!(fs::create_dir_all(&self_contained_dst));
1148 for (path, dependency_type) in builder.read_stamp_file(stamp) {
1149 let dst = match dependency_type {
1150 DependencyType::Host => sysroot_host_dst,
1151 DependencyType::Target => sysroot_dst,
1152 DependencyType::TargetSelfContained => self_contained_dst,
1154 builder.copy(&path, &dst.join(path.file_name().unwrap()));
1159 builder: &Builder<'_>,
1161 tail_args: Vec<String>,
1163 additional_target_deps: Vec<(PathBuf, DependencyType)>,
1166 if builder.config.dry_run {
1170 // `target_root_dir` looks like $dir/$target/release
1171 let target_root_dir = stamp.parent().unwrap();
1172 // `target_deps_dir` looks like $dir/$target/release/deps
1173 let target_deps_dir = target_root_dir.join("deps");
1174 // `host_root_dir` looks like $dir/release
1175 let host_root_dir = target_root_dir
1177 .unwrap() // chop off `release`
1179 .unwrap() // chop off `$target`
1180 .join(target_root_dir.file_name().unwrap());
1182 // Spawn Cargo slurping up its JSON output. We'll start building up the
1183 // `deps` array of all files it generated along with a `toplevel` array of
1184 // files we need to probe for later.
1185 let mut deps = Vec::new();
1186 let mut toplevel = Vec::new();
1187 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1188 let (filenames, crate_types) = match msg {
1189 CargoMessage::CompilerArtifact {
1191 target: CargoTarget { crate_types },
1193 } => (filenames, crate_types),
1196 for filename in filenames {
1197 // Skip files like executables
1198 if !(filename.ends_with(".rlib")
1199 || filename.ends_with(".lib")
1200 || filename.ends_with(".a")
1201 || is_debug_info(&filename)
1202 || is_dylib(&filename)
1203 || (is_check && filename.ends_with(".rmeta")))
1208 let filename = Path::new(&*filename);
1210 // If this was an output file in the "host dir" we don't actually
1211 // worry about it, it's not relevant for us
1212 if filename.starts_with(&host_root_dir) {
1213 // Unless it's a proc macro used in the compiler
1214 if crate_types.iter().any(|t| t == "proc-macro") {
1215 deps.push((filename.to_path_buf(), DependencyType::Host));
1220 // If this was output in the `deps` dir then this is a precise file
1221 // name (hash included) so we start tracking it.
1222 if filename.starts_with(&target_deps_dir) {
1223 deps.push((filename.to_path_buf(), DependencyType::Target));
1227 // Otherwise this was a "top level artifact" which right now doesn't
1228 // have a hash in the name, but there's a version of this file in
1229 // the `deps` folder which *does* have a hash in the name. That's
1230 // the one we'll want to we'll probe for it later.
1232 // We do not use `Path::file_stem` or `Path::extension` here,
1233 // because some generated files may have multiple extensions e.g.
1234 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1235 // split the file name by the last extension (`.lib`) while we need
1236 // to split by all extensions (`.dll.lib`).
1237 let expected_len = t!(filename.metadata()).len();
1238 let filename = filename.file_name().unwrap().to_str().unwrap();
1239 let mut parts = filename.splitn(2, '.');
1240 let file_stem = parts.next().unwrap().to_owned();
1241 let extension = parts.next().unwrap().to_owned();
1243 toplevel.push((file_stem, extension, expected_len));
1251 // Ok now we need to actually find all the files listed in `toplevel`. We've
1252 // got a list of prefix/extensions and we basically just need to find the
1253 // most recent file in the `deps` folder corresponding to each one.
1254 let contents = t!(target_deps_dir.read_dir())
1256 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1257 .collect::<Vec<_>>();
1258 for (prefix, extension, expected_len) in toplevel {
1259 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1260 meta.len() == expected_len
1262 .strip_prefix(&prefix[..])
1263 .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
1266 let max = candidates
1267 .max_by_key(|&&(_, _, ref metadata)| FileTime::from_last_modification_time(metadata));
1268 let path_to_add = match max {
1269 Some(triple) => triple.0.to_str().unwrap(),
1270 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1272 if is_dylib(path_to_add) {
1273 let candidate = format!("{}.lib", path_to_add);
1274 let candidate = PathBuf::from(candidate);
1275 if candidate.exists() {
1276 deps.push((candidate, DependencyType::Target));
1279 deps.push((path_to_add.into(), DependencyType::Target));
1282 deps.extend(additional_target_deps);
1284 let mut new_contents = Vec::new();
1285 for (dep, dependency_type) in deps.iter() {
1286 new_contents.extend(match *dependency_type {
1287 DependencyType::Host => b"h",
1288 DependencyType::Target => b"t",
1289 DependencyType::TargetSelfContained => b"s",
1291 new_contents.extend(dep.to_str().unwrap().as_bytes());
1292 new_contents.extend(b"\0");
1294 t!(fs::write(&stamp, &new_contents));
1295 deps.into_iter().map(|(d, _)| d).collect()
1298 pub fn stream_cargo(
1299 builder: &Builder<'_>,
1301 tail_args: Vec<String>,
1302 cb: &mut dyn FnMut(CargoMessage<'_>),
1304 let mut cargo = Command::from(cargo);
1305 if builder.config.dry_run {
1308 // Instruct Cargo to give us json messages on stdout, critically leaving
1309 // stderr as piped so we can get those pretty colors.
1310 let mut message_format = if builder.config.json_output {
1311 String::from("json")
1313 String::from("json-render-diagnostics")
1315 if let Some(s) = &builder.config.rustc_error_format {
1316 message_format.push_str(",json-diagnostic-");
1317 message_format.push_str(s);
1319 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1321 for arg in tail_args {
1325 builder.verbose(&format!("running: {:?}", cargo));
1326 let mut child = match cargo.spawn() {
1328 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1331 // Spawn Cargo slurping up its JSON output. We'll start building up the
1332 // `deps` array of all files it generated along with a `toplevel` array of
1333 // files we need to probe for later.
1334 let stdout = BufReader::new(child.stdout.take().unwrap());
1335 for line in stdout.lines() {
1336 let line = t!(line);
1337 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1339 if builder.config.json_output {
1340 // Forward JSON to stdout.
1341 println!("{}", line);
1345 // If this was informational, just print it out and continue
1346 Err(_) => println!("{}", line),
1350 // Make sure Cargo actually succeeded after we read all of its stdout.
1351 let status = t!(child.wait());
1352 if !status.success() {
1354 "command did not execute successfully: {:?}\n\
1355 expected success, got: {}",
1362 #[derive(Deserialize)]
1363 pub struct CargoTarget<'a> {
1364 crate_types: Vec<Cow<'a, str>>,
1367 #[derive(Deserialize)]
1368 #[serde(tag = "reason", rename_all = "kebab-case")]
1369 pub enum CargoMessage<'a> {
1371 package_id: Cow<'a, str>,
1372 features: Vec<Cow<'a, str>>,
1373 filenames: Vec<Cow<'a, str>>,
1374 target: CargoTarget<'a>,
1376 BuildScriptExecuted {
1377 package_id: Cow<'a, str>,