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.
12 use std::io::prelude::*;
13 use std::io::BufReader;
14 use std::path::{Path, PathBuf};
15 use std::process::{exit, Command, Stdio};
18 use build_helper::{output, t, up_to_date};
19 use filetime::FileTime;
20 use serde::Deserialize;
22 use crate::builder::Cargo;
23 use crate::builder::{Builder, Kind, RunConfig, ShouldRun, Step};
24 use crate::cache::{Interned, INTERNER};
25 use crate::config::TargetSelection;
28 use crate::tool::SourceType;
29 use crate::util::{exe, is_dylib, symlink_dir};
30 use crate::{Compiler, DependencyType, GitRepo, Mode};
32 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
34 pub target: TargetSelection,
35 pub compiler: Compiler,
40 const DEFAULT: bool = true;
42 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
43 run.all_krates("test")
46 fn make_run(run: RunConfig<'_>) {
47 run.builder.ensure(Std {
48 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
53 /// Builds the standard library.
55 /// This will build the standard library for a particular stage of the build
56 /// using the `compiler` targeting the `target` architecture. The artifacts
57 /// created will also be linked into the sysroot directory.
58 fn run(self, builder: &Builder<'_>) {
59 let target = self.target;
60 let compiler = self.compiler;
62 if builder.config.keep_stage.contains(&compiler.stage)
63 || builder.config.keep_stage_std.contains(&compiler.stage)
65 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
66 builder.ensure(StdLink { compiler, target_compiler: compiler, target });
70 let mut target_deps = builder.ensure(StartupObjects { compiler, target });
72 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
73 if compiler_to_use != compiler {
74 builder.ensure(Std { compiler: compiler_to_use, target });
75 builder.info(&format!("Uplifting stage1 std ({} -> {})", compiler_to_use.host, target));
77 // Even if we're not building std this stage, the new sysroot must
78 // still contain the third party objects needed by various targets.
79 copy_third_party_objects(builder, &compiler, target);
80 copy_self_contained_objects(builder, &compiler, target);
82 builder.ensure(StdLink {
83 compiler: compiler_to_use,
84 target_compiler: compiler,
90 target_deps.extend(copy_third_party_objects(builder, &compiler, target));
91 target_deps.extend(copy_self_contained_objects(builder, &compiler, target));
93 let mut cargo = builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "build");
94 std_cargo(builder, target, compiler.stage, &mut cargo);
96 builder.info(&format!(
97 "Building stage{} std artifacts ({} -> {})",
98 compiler.stage, &compiler.host, target
104 &libstd_stamp(builder, compiler, target),
109 builder.ensure(StdLink {
110 compiler: builder.compiler(compiler.stage, builder.config.build),
111 target_compiler: compiler,
118 builder: &Builder<'_>,
122 target_deps: &mut Vec<(PathBuf, DependencyType)>,
123 dependency_type: DependencyType,
125 let target = libdir.join(name);
126 builder.copy(&sourcedir.join(name), &target);
128 target_deps.push((target, dependency_type));
131 /// Copies third party objects needed by various targets.
132 fn copy_third_party_objects(
133 builder: &Builder<'_>,
135 target: TargetSelection,
136 ) -> Vec<(PathBuf, DependencyType)> {
137 let mut target_deps = vec![];
139 // FIXME: remove this in 2021
140 if target == "x86_64-fortanix-unknown-sgx" {
141 if env::var_os("X86_FORTANIX_SGX_LIBS").is_some() {
142 builder.info("Warning: X86_FORTANIX_SGX_LIBS environment variable is ignored, libunwind is now compiled as part of rustbuild");
146 if builder.config.sanitizers_enabled(target) && compiler.stage != 0 {
147 // The sanitizers are only copied in stage1 or above,
148 // to avoid creating dependency on LLVM.
150 copy_sanitizers(builder, &compiler, target)
152 .map(|d| (d, DependencyType::Target)),
159 /// Copies third party objects needed by various targets for self-contained linkage.
160 fn copy_self_contained_objects(
161 builder: &Builder<'_>,
163 target: TargetSelection,
164 ) -> Vec<(PathBuf, DependencyType)> {
165 let libdir_self_contained = builder.sysroot_libdir(*compiler, target).join("self-contained");
166 t!(fs::create_dir_all(&libdir_self_contained));
167 let mut target_deps = vec![];
169 // Copies the CRT objects.
171 // rustc historically provides a more self-contained installation for musl targets
172 // not requiring the presence of a native musl toolchain. For example, it can fall back
173 // to using gcc from a glibc-targeting toolchain for linking.
174 // To do that we have to distribute musl startup objects as a part of Rust toolchain
175 // and link with them manually in the self-contained mode.
176 if target.contains("musl") {
177 let srcdir = builder.musl_libdir(target).unwrap();
178 for &obj in &["crt1.o", "Scrt1.o", "rcrt1.o", "crti.o", "crtn.o"] {
181 &libdir_self_contained,
185 DependencyType::TargetSelfContained,
188 } else if target.ends_with("-wasi") {
189 let srcdir = builder.wasi_root(target).unwrap().join("lib/wasm32-wasi");
192 &libdir_self_contained,
196 DependencyType::TargetSelfContained,
198 } else if target.contains("windows-gnu") {
199 for obj in ["crt2.o", "dllcrt2.o"].iter() {
200 let src = compiler_file(builder, builder.cc(target), target, obj);
201 let target = libdir_self_contained.join(obj);
202 builder.copy(&src, &target);
203 target_deps.push((target, DependencyType::TargetSelfContained));
210 /// Configure cargo to compile the standard library, adding appropriate env vars
212 pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, cargo: &mut Cargo) {
213 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
214 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
217 // Determine if we're going to compile in optimized C intrinsics to
218 // the `compiler-builtins` crate. These intrinsics live in LLVM's
219 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
220 // always checked out, so we need to conditionally look for this. (e.g. if
221 // an external LLVM is used we skip the LLVM submodule checkout).
223 // Note that this shouldn't affect the correctness of `compiler-builtins`,
224 // but only its speed. Some intrinsics in C haven't been translated to Rust
225 // yet but that's pretty rare. Other intrinsics have optimized
226 // implementations in C which have only had slower versions ported to Rust,
227 // so we favor the C version where we can, but it's not critical.
229 // If `compiler-rt` is available ensure that the `c` feature of the
230 // `compiler-builtins` crate is enabled and it's configured to learn where
231 // `compiler-rt` is located.
232 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
233 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
234 // Note that `libprofiler_builtins/build.rs` also computes this so if
235 // you're changing something here please also change that.
236 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
237 " compiler-builtins-c"
242 if builder.no_std(target) == Some(true) {
243 let mut features = "compiler-builtins-mem".to_string();
244 features.push_str(compiler_builtins_c_feature);
246 // for no-std targets we only compile a few no_std crates
248 .args(&["-p", "alloc"])
249 .arg("--manifest-path")
250 .arg(builder.src.join("library/alloc/Cargo.toml"))
254 let mut features = builder.std_features(target);
255 features.push_str(compiler_builtins_c_feature);
260 .arg("--manifest-path")
261 .arg(builder.src.join("library/test/Cargo.toml"));
263 // Help the libc crate compile by assisting it in finding various
264 // sysroot native libraries.
265 if target.contains("musl") {
266 if let Some(p) = builder.musl_libdir(target) {
267 let root = format!("native={}", p.to_str().unwrap());
268 cargo.rustflag("-L").rustflag(&root);
272 if target.ends_with("-wasi") {
273 if let Some(p) = builder.wasi_root(target) {
274 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
275 cargo.rustflag("-L").rustflag(&root);
280 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
281 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
282 // built with bitcode so that the produced rlibs can be used for both LTO
283 // builds (which use bitcode) and non-LTO builds (which use object code).
284 // So we override the override here!
286 // But we don't bother for the stage 0 compiler because it's never used
289 cargo.rustflag("-Cembed-bitcode=yes");
292 // By default, rustc does not include unwind tables unless they are required
293 // for a particular target. They are not required by RISC-V targets, but
294 // compiling the standard library with them means that users can get
295 // backtraces without having to recompile the standard library themselves.
297 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
298 if target.contains("riscv") {
299 cargo.rustflag("-Cforce-unwind-tables=yes");
303 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
305 pub compiler: Compiler,
306 pub target_compiler: Compiler,
307 pub target: TargetSelection,
310 impl Step for StdLink {
313 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
317 /// Link all libstd rlibs/dylibs into the sysroot location.
319 /// Links those artifacts generated by `compiler` to the `stage` compiler's
320 /// sysroot for the specified `host` and `target`.
322 /// Note that this assumes that `compiler` has already generated the libstd
323 /// libraries for `target`, and this method will find them in the relevant
324 /// output directory.
325 fn run(self, builder: &Builder<'_>) {
326 let compiler = self.compiler;
327 let target_compiler = self.target_compiler;
328 let target = self.target;
329 builder.info(&format!(
330 "Copying stage{} std from stage{} ({} -> {} / {})",
331 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
333 let libdir = builder.sysroot_libdir(target_compiler, target);
334 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
335 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
339 /// Copies sanitizer runtime libraries into target libdir.
341 builder: &Builder<'_>,
343 target: TargetSelection,
345 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
347 if builder.config.dry_run {
351 let mut target_deps = Vec::new();
352 let libdir = builder.sysroot_libdir(*compiler, target);
354 for runtime in &runtimes {
355 let dst = libdir.join(&runtime.name);
356 builder.copy(&runtime.path, &dst);
358 if target == "x86_64-apple-darwin" {
359 // Update the library install name reflect the fact it has been renamed.
360 let status = Command::new("install_name_tool")
362 .arg(format!("@rpath/{}", runtime.name))
365 .expect("failed to execute `install_name_tool`");
366 assert!(status.success());
369 target_deps.push(dst);
375 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
376 pub struct StartupObjects {
377 pub compiler: Compiler,
378 pub target: TargetSelection,
381 impl Step for StartupObjects {
382 type Output = Vec<(PathBuf, DependencyType)>;
384 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
385 run.path("library/rtstartup")
388 fn make_run(run: RunConfig<'_>) {
389 run.builder.ensure(StartupObjects {
390 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
395 /// Builds and prepare startup objects like rsbegin.o and rsend.o
397 /// These are primarily used on Windows right now for linking executables/dlls.
398 /// They don't require any library support as they're just plain old object
399 /// files, so we just use the nightly snapshot compiler to always build them (as
400 /// no other compilers are guaranteed to be available).
401 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
402 let for_compiler = self.compiler;
403 let target = self.target;
404 if !target.contains("windows-gnu") {
408 let mut target_deps = vec![];
410 let src_dir = &builder.src.join("library").join("rtstartup");
411 let dst_dir = &builder.native_dir(target).join("rtstartup");
412 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
413 t!(fs::create_dir_all(dst_dir));
415 for file in &["rsbegin", "rsend"] {
416 let src_file = &src_dir.join(file.to_string() + ".rs");
417 let dst_file = &dst_dir.join(file.to_string() + ".o");
418 if !up_to_date(src_file, dst_file) {
419 let mut cmd = Command::new(&builder.initial_rustc);
421 cmd.env("RUSTC_BOOTSTRAP", "1")
425 .arg(target.rustc_target_arg())
433 let target = sysroot_dir.join((*file).to_string() + ".o");
434 builder.copy(dst_file, &target);
435 target_deps.push((target, DependencyType::Target));
442 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
444 pub target: TargetSelection,
445 pub compiler: Compiler,
448 impl Step for Rustc {
450 const ONLY_HOSTS: bool = true;
451 const DEFAULT: bool = false;
453 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
454 run.path("compiler/rustc")
457 fn make_run(run: RunConfig<'_>) {
458 run.builder.ensure(Rustc {
459 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
464 /// Builds the compiler.
466 /// This will build the compiler for a particular stage of the build using
467 /// the `compiler` targeting the `target` architecture. The artifacts
468 /// created will also be linked into the sysroot directory.
469 fn run(self, builder: &Builder<'_>) {
470 let compiler = self.compiler;
471 let target = self.target;
473 builder.ensure(Std { compiler, target });
475 if builder.config.keep_stage.contains(&compiler.stage) {
476 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
477 builder.info("Warning: Use `--keep-stage-std` if you want to rebuild the compiler when it changes");
478 builder.ensure(RustcLink { compiler, target_compiler: compiler, target });
482 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
483 if compiler_to_use != compiler {
484 builder.ensure(Rustc { compiler: compiler_to_use, target });
486 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
487 builder.ensure(RustcLink {
488 compiler: compiler_to_use,
489 target_compiler: compiler,
495 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
497 compiler: builder.compiler(self.compiler.stage, builder.config.build),
498 target: builder.config.build,
501 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "build");
502 rustc_cargo(builder, &mut cargo, target);
504 if builder.config.rust_profile_use.is_some()
505 && builder.config.rust_profile_generate.is_some()
507 panic!("Cannot use and generate PGO profiles at the same time");
510 let is_collecting = if let Some(path) = &builder.config.rust_profile_generate {
511 if compiler.stage == 1 {
512 cargo.rustflag(&format!("-Cprofile-generate={}", path));
513 // Apparently necessary to avoid overflowing the counters during
514 // a Cargo build profile
515 cargo.rustflag("-Cllvm-args=-vp-counters-per-site=4");
520 } else if let Some(path) = &builder.config.rust_profile_use {
521 if compiler.stage == 1 {
522 cargo.rustflag(&format!("-Cprofile-use={}", path));
523 cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
532 // Ensure paths to Rust sources are relative, not absolute.
533 cargo.rustflag(&format!(
534 "-Cllvm-args=-static-func-strip-dirname-prefix={}",
535 builder.config.src.components().count()
539 builder.info(&format!(
540 "Building stage{} compiler artifacts ({} -> {})",
541 compiler.stage, &compiler.host, target
547 &librustc_stamp(builder, compiler, target),
552 builder.ensure(RustcLink {
553 compiler: builder.compiler(compiler.stage, builder.config.build),
554 target_compiler: compiler,
560 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
563 .arg(builder.rustc_features())
564 .arg("--manifest-path")
565 .arg(builder.src.join("compiler/rustc/Cargo.toml"));
566 rustc_cargo_env(builder, cargo, target);
569 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
570 // Set some configuration variables picked up by build scripts and
571 // the compiler alike
573 .env("CFG_RELEASE", builder.rust_release())
574 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
575 .env("CFG_VERSION", builder.rust_version())
576 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default());
578 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
579 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
581 if let Some(ref ver_date) = builder.rust_info.commit_date() {
582 cargo.env("CFG_VER_DATE", ver_date);
584 if let Some(ref ver_hash) = builder.rust_info.sha() {
585 cargo.env("CFG_VER_HASH", ver_hash);
587 if !builder.unstable_features() {
588 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
590 if let Some(ref s) = builder.config.rustc_default_linker {
591 cargo.env("CFG_DEFAULT_LINKER", s);
593 if builder.config.rustc_parallel {
594 cargo.rustflag("--cfg=parallel_compiler");
596 if builder.config.rust_verify_llvm_ir {
597 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
600 // Pass down configuration from the LLVM build into the build of
601 // rustc_llvm and rustc_codegen_llvm.
603 // Note that this is disabled if LLVM itself is disabled or we're in a check
604 // build. If we are in a check build we still go ahead here presuming we've
605 // detected that LLVM is alreay built and good to go which helps prevent
606 // busting caches (e.g. like #71152).
607 if builder.config.llvm_enabled()
608 && (builder.kind != Kind::Check
609 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
611 if builder.is_rust_llvm(target) {
612 cargo.env("LLVM_RUSTLLVM", "1");
614 let llvm_config = builder.ensure(native::Llvm { target });
615 cargo.env("LLVM_CONFIG", &llvm_config);
616 let target_config = builder.config.target_config.get(&target);
617 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
618 cargo.env("CFG_LLVM_ROOT", s);
620 // Some LLVM linker flags (-L and -l) may be needed to link rustc_llvm.
621 if let Some(ref s) = builder.config.llvm_ldflags {
622 cargo.env("LLVM_LINKER_FLAGS", s);
624 // Building with a static libstdc++ is only supported on linux right now,
625 // not for MSVC or macOS
626 if builder.config.llvm_static_stdcpp
627 && !target.contains("freebsd")
628 && !target.contains("msvc")
629 && !target.contains("apple")
631 let file = compiler_file(builder, builder.cxx(target).unwrap(), target, "libstdc++.a");
632 cargo.env("LLVM_STATIC_STDCPP", file);
634 if builder.config.llvm_link_shared {
635 cargo.env("LLVM_LINK_SHARED", "1");
637 if builder.config.llvm_use_libcxx {
638 cargo.env("LLVM_USE_LIBCXX", "1");
640 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
641 cargo.env("LLVM_NDEBUG", "1");
646 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
648 pub compiler: Compiler,
649 pub target_compiler: Compiler,
650 pub target: TargetSelection,
653 impl Step for RustcLink {
656 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
660 /// Same as `std_link`, only for librustc
661 fn run(self, builder: &Builder<'_>) {
662 let compiler = self.compiler;
663 let target_compiler = self.target_compiler;
664 let target = self.target;
665 builder.info(&format!(
666 "Copying stage{} rustc from stage{} ({} -> {} / {})",
667 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
671 &builder.sysroot_libdir(target_compiler, target),
672 &builder.sysroot_libdir(target_compiler, compiler.host),
673 &librustc_stamp(builder, compiler, target),
678 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
679 pub struct CodegenBackend {
680 pub target: TargetSelection,
681 pub compiler: Compiler,
682 pub backend: Interned<String>,
685 impl Step for CodegenBackend {
687 const ONLY_HOSTS: bool = true;
688 // Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
689 const DEFAULT: bool = true;
691 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
692 run.path("compiler/rustc_codegen_cranelift")
695 fn make_run(run: RunConfig<'_>) {
696 for &backend in &run.builder.config.rust_codegen_backends {
697 if backend == "llvm" {
698 continue; // Already built as part of rustc
701 run.builder.ensure(CodegenBackend {
703 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
709 fn run(self, builder: &Builder<'_>) {
710 let compiler = self.compiler;
711 let target = self.target;
712 let backend = self.backend;
714 builder.ensure(Rustc { compiler, target });
716 if builder.config.keep_stage.contains(&compiler.stage) {
718 "Warning: Using a potentially old codegen backend. \
719 This may not behave well.",
721 // Codegen backends are linked separately from this step today, so we don't do
726 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
727 if compiler_to_use != compiler {
728 builder.ensure(CodegenBackend { compiler: compiler_to_use, target, backend });
732 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
735 builder.cargo(compiler, Mode::Codegen, SourceType::Submodule, target, "build");
737 .arg("--manifest-path")
738 .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));
739 rustc_cargo_env(builder, &mut cargo, target);
741 let tmp_stamp = out_dir.join(".tmp.stamp");
743 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false);
744 if builder.config.dry_run {
747 let mut files = files.into_iter().filter(|f| {
748 let filename = f.file_name().unwrap().to_str().unwrap();
749 is_dylib(filename) && filename.contains("rustc_codegen_")
751 let codegen_backend = match files.next() {
753 None => panic!("no dylibs built for codegen backend?"),
755 if let Some(f) = files.next() {
757 "codegen backend built two dylibs:\n{}\n{}",
758 codegen_backend.display(),
762 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
763 let codegen_backend = codegen_backend.to_str().unwrap();
764 t!(fs::write(&stamp, &codegen_backend));
768 /// Creates the `codegen-backends` folder for a compiler that's about to be
769 /// assembled as a complete compiler.
771 /// This will take the codegen artifacts produced by `compiler` and link them
772 /// into an appropriate location for `target_compiler` to be a functional
774 fn copy_codegen_backends_to_sysroot(
775 builder: &Builder<'_>,
777 target_compiler: Compiler,
779 let target = target_compiler.host;
781 // Note that this step is different than all the other `*Link` steps in
782 // that it's not assembling a bunch of libraries but rather is primarily
783 // moving the codegen backend into place. The codegen backend of rustc is
784 // not linked into the main compiler by default but is rather dynamically
785 // selected at runtime for inclusion.
787 // Here we're looking for the output dylib of the `CodegenBackend` step and
788 // we're copying that into the `codegen-backends` folder.
789 let dst = builder.sysroot_codegen_backends(target_compiler);
790 t!(fs::create_dir_all(&dst), dst);
792 if builder.config.dry_run {
796 for backend in builder.config.rust_codegen_backends.iter() {
797 if backend == "llvm" {
798 continue; // Already built as part of rustc
801 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
802 let dylib = t!(fs::read_to_string(&stamp));
803 let file = Path::new(&dylib);
804 let filename = file.file_name().unwrap().to_str().unwrap();
805 // change `librustc_codegen_cranelift-xxxxxx.so` to
806 // `librustc_codegen_cranelift-release.so`
807 let target_filename = {
808 let dash = filename.find('-').unwrap();
809 let dot = filename.find('.').unwrap();
810 format!("{}-{}{}", &filename[..dash], builder.rust_release(), &filename[dot..])
812 builder.copy(&file, &dst.join(target_filename));
816 /// Cargo's output path for the standard library in a given stage, compiled
817 /// by a particular compiler for the specified target.
818 pub fn libstd_stamp(builder: &Builder<'_>, compiler: Compiler, target: TargetSelection) -> PathBuf {
819 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
822 /// Cargo's output path for librustc in a given stage, compiled by a particular
823 /// compiler for the specified target.
824 pub fn librustc_stamp(
825 builder: &Builder<'_>,
827 target: TargetSelection,
829 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
832 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
833 /// compiler for the specified target and backend.
834 fn codegen_backend_stamp(
835 builder: &Builder<'_>,
837 target: TargetSelection,
838 backend: Interned<String>,
841 .cargo_out(compiler, Mode::Codegen, target)
842 .join(format!(".librustc_codegen_{}.stamp", backend))
845 pub fn compiler_file(
846 builder: &Builder<'_>,
848 target: TargetSelection,
851 let mut cmd = Command::new(compiler);
852 cmd.args(builder.cflags(target, GitRepo::Rustc));
853 cmd.arg(format!("-print-file-name={}", file));
854 let out = output(&mut cmd);
855 PathBuf::from(out.trim())
858 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
860 pub compiler: Compiler,
863 impl Step for Sysroot {
864 type Output = Interned<PathBuf>;
866 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
870 /// Returns the sysroot for the `compiler` specified that *this build system
873 /// That is, the sysroot for the stage0 compiler is not what the compiler
874 /// thinks it is by default, but it's the same as the default for stages
876 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
877 let compiler = self.compiler;
878 let sysroot = if compiler.stage == 0 {
879 builder.out.join(&compiler.host.triple).join("stage0-sysroot")
881 builder.out.join(&compiler.host.triple).join(format!("stage{}", compiler.stage))
883 let _ = fs::remove_dir_all(&sysroot);
884 t!(fs::create_dir_all(&sysroot));
886 // Symlink the source root into the same location inside the sysroot,
887 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
888 // so that any tools relying on `rust-src` also work for local builds,
889 // and also for translating the virtual `/rustc/$hash` back to the real
890 // directory (for running tests with `rust.remap-debuginfo = true`).
891 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
892 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
893 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
894 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
896 "warning: creating symbolic link `{}` to `{}` failed with {}",
897 sysroot_lib_rustlib_src_rust.display(),
898 builder.src.display(),
901 if builder.config.rust_remap_debuginfo {
903 "warning: some `src/test/ui` tests will fail when lacking `{}`",
904 sysroot_lib_rustlib_src_rust.display(),
909 INTERNER.intern_path(sysroot)
913 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
914 pub struct Assemble {
915 /// The compiler which we will produce in this step. Assemble itself will
916 /// take care of ensuring that the necessary prerequisites to do so exist,
917 /// that is, this target can be a stage2 compiler and Assemble will build
918 /// previous stages for you.
919 pub target_compiler: Compiler,
922 impl Step for Assemble {
923 type Output = Compiler;
925 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
929 /// Prepare a new compiler from the artifacts in `stage`
931 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
932 /// must have been previously produced by the `stage - 1` builder.build
934 fn run(self, builder: &Builder<'_>) -> Compiler {
935 let target_compiler = self.target_compiler;
937 if target_compiler.stage == 0 {
939 builder.config.build, target_compiler.host,
940 "Cannot obtain compiler for non-native build triple at stage 0"
942 // The stage 0 compiler for the build triple is always pre-built.
943 return target_compiler;
946 // Get the compiler that we'll use to bootstrap ourselves.
948 // Note that this is where the recursive nature of the bootstrap
949 // happens, as this will request the previous stage's compiler on
950 // downwards to stage 0.
952 // Also note that we're building a compiler for the host platform. We
953 // only assume that we can run `build` artifacts, which means that to
954 // produce some other architecture compiler we need to start from
955 // `build` to get there.
957 // FIXME: Perhaps we should download those libraries?
958 // It would make builds faster...
960 // FIXME: It may be faster if we build just a stage 1 compiler and then
961 // use that to bootstrap this compiler forward.
962 let build_compiler = builder.compiler(target_compiler.stage - 1, builder.config.build);
964 // Build the libraries for this compiler to link to (i.e., the libraries
965 // it uses at runtime). NOTE: Crates the target compiler compiles don't
966 // link to these. (FIXME: Is that correct? It seems to be correct most
967 // of the time but I think we do link to these for stage2/bin compilers
968 // when not performing a full bootstrap).
969 builder.ensure(Rustc { compiler: build_compiler, target: target_compiler.host });
971 for &backend in builder.config.rust_codegen_backends.iter() {
972 if backend == "llvm" {
973 continue; // Already built as part of rustc
976 builder.ensure(CodegenBackend {
977 compiler: build_compiler,
978 target: target_compiler.host,
983 let lld_install = if builder.config.lld_enabled {
984 Some(builder.ensure(native::Lld { target: target_compiler.host }))
989 let stage = target_compiler.stage;
990 let host = target_compiler.host;
991 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
993 // Link in all dylibs to the libdir
994 let sysroot = builder.sysroot(target_compiler);
995 let rustc_libdir = builder.rustc_libdir(target_compiler);
996 t!(fs::create_dir_all(&rustc_libdir));
997 let src_libdir = builder.sysroot_libdir(build_compiler, host);
998 for f in builder.read_dir(&src_libdir) {
999 let filename = f.file_name().into_string().unwrap();
1000 if is_dylib(&filename) {
1001 builder.copy(&f.path(), &rustc_libdir.join(&filename));
1005 copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
1007 // We prepend this bin directory to the user PATH when linking Rust binaries. To
1008 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
1009 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
1010 let libdir_bin = libdir.parent().unwrap().join("bin");
1011 t!(fs::create_dir_all(&libdir_bin));
1013 if let Some(lld_install) = lld_install {
1014 let src_exe = exe("lld", target_compiler.host);
1015 let dst_exe = exe("rust-lld", target_compiler.host);
1016 builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
1019 // Similarly, copy `llvm-dwp` into libdir for Split DWARF.
1021 let src_exe = exe("llvm-dwp", target_compiler.host);
1022 let dst_exe = exe("rust-llvm-dwp", target_compiler.host);
1023 let llvm_config_bin = builder.ensure(native::Llvm { target: target_compiler.host });
1024 let llvm_bin_dir = llvm_config_bin.parent().unwrap();
1025 builder.copy(&llvm_bin_dir.join(&src_exe), &libdir_bin.join(&dst_exe));
1028 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
1029 // so that it can be found when the newly built `rustc` is run.
1030 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
1031 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
1033 // Link the compiler binary itself into place
1034 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1035 let rustc = out_dir.join(exe("rustc-main", host));
1036 let bindir = sysroot.join("bin");
1037 t!(fs::create_dir_all(&bindir));
1038 let compiler = builder.rustc(target_compiler);
1039 builder.copy(&rustc, &compiler);
1045 /// Link some files into a rustc sysroot.
1047 /// For a particular stage this will link the file listed in `stamp` into the
1048 /// `sysroot_dst` provided.
1049 pub fn add_to_sysroot(
1050 builder: &Builder<'_>,
1052 sysroot_host_dst: &Path,
1055 let self_contained_dst = &sysroot_dst.join("self-contained");
1056 t!(fs::create_dir_all(&sysroot_dst));
1057 t!(fs::create_dir_all(&sysroot_host_dst));
1058 t!(fs::create_dir_all(&self_contained_dst));
1059 for (path, dependency_type) in builder.read_stamp_file(stamp) {
1060 let dst = match dependency_type {
1061 DependencyType::Host => sysroot_host_dst,
1062 DependencyType::Target => sysroot_dst,
1063 DependencyType::TargetSelfContained => self_contained_dst,
1065 builder.copy(&path, &dst.join(path.file_name().unwrap()));
1070 builder: &Builder<'_>,
1072 tail_args: Vec<String>,
1074 additional_target_deps: Vec<(PathBuf, DependencyType)>,
1077 if builder.config.dry_run {
1081 // `target_root_dir` looks like $dir/$target/release
1082 let target_root_dir = stamp.parent().unwrap();
1083 // `target_deps_dir` looks like $dir/$target/release/deps
1084 let target_deps_dir = target_root_dir.join("deps");
1085 // `host_root_dir` looks like $dir/release
1086 let host_root_dir = target_root_dir
1088 .unwrap() // chop off `release`
1090 .unwrap() // chop off `$target`
1091 .join(target_root_dir.file_name().unwrap());
1093 // Spawn Cargo slurping up its JSON output. We'll start building up the
1094 // `deps` array of all files it generated along with a `toplevel` array of
1095 // files we need to probe for later.
1096 let mut deps = Vec::new();
1097 let mut toplevel = Vec::new();
1098 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1099 let (filenames, crate_types) = match msg {
1100 CargoMessage::CompilerArtifact {
1102 target: CargoTarget { crate_types },
1104 } => (filenames, crate_types),
1107 for filename in filenames {
1108 // Skip files like executables
1109 if !(filename.ends_with(".rlib")
1110 || filename.ends_with(".lib")
1111 || filename.ends_with(".a")
1112 || is_dylib(&filename)
1113 || (is_check && filename.ends_with(".rmeta")))
1118 let filename = Path::new(&*filename);
1120 // If this was an output file in the "host dir" we don't actually
1121 // worry about it, it's not relevant for us
1122 if filename.starts_with(&host_root_dir) {
1123 // Unless it's a proc macro used in the compiler
1124 if crate_types.iter().any(|t| t == "proc-macro") {
1125 deps.push((filename.to_path_buf(), DependencyType::Host));
1130 // If this was output in the `deps` dir then this is a precise file
1131 // name (hash included) so we start tracking it.
1132 if filename.starts_with(&target_deps_dir) {
1133 deps.push((filename.to_path_buf(), DependencyType::Target));
1137 // Otherwise this was a "top level artifact" which right now doesn't
1138 // have a hash in the name, but there's a version of this file in
1139 // the `deps` folder which *does* have a hash in the name. That's
1140 // the one we'll want to we'll probe for it later.
1142 // We do not use `Path::file_stem` or `Path::extension` here,
1143 // because some generated files may have multiple extensions e.g.
1144 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1145 // split the file name by the last extension (`.lib`) while we need
1146 // to split by all extensions (`.dll.lib`).
1147 let expected_len = t!(filename.metadata()).len();
1148 let filename = filename.file_name().unwrap().to_str().unwrap();
1149 let mut parts = filename.splitn(2, '.');
1150 let file_stem = parts.next().unwrap().to_owned();
1151 let extension = parts.next().unwrap().to_owned();
1153 toplevel.push((file_stem, extension, expected_len));
1161 // Ok now we need to actually find all the files listed in `toplevel`. We've
1162 // got a list of prefix/extensions and we basically just need to find the
1163 // most recent file in the `deps` folder corresponding to each one.
1164 let contents = t!(target_deps_dir.read_dir())
1166 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1167 .collect::<Vec<_>>();
1168 for (prefix, extension, expected_len) in toplevel {
1169 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1170 meta.len() == expected_len
1172 .strip_prefix(&prefix[..])
1173 .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
1176 let max = candidates
1177 .max_by_key(|&&(_, _, ref metadata)| FileTime::from_last_modification_time(metadata));
1178 let path_to_add = match max {
1179 Some(triple) => triple.0.to_str().unwrap(),
1180 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1182 if is_dylib(path_to_add) {
1183 let candidate = format!("{}.lib", path_to_add);
1184 let candidate = PathBuf::from(candidate);
1185 if candidate.exists() {
1186 deps.push((candidate, DependencyType::Target));
1189 deps.push((path_to_add.into(), DependencyType::Target));
1192 deps.extend(additional_target_deps);
1194 let mut new_contents = Vec::new();
1195 for (dep, dependency_type) in deps.iter() {
1196 new_contents.extend(match *dependency_type {
1197 DependencyType::Host => b"h",
1198 DependencyType::Target => b"t",
1199 DependencyType::TargetSelfContained => b"s",
1201 new_contents.extend(dep.to_str().unwrap().as_bytes());
1202 new_contents.extend(b"\0");
1204 t!(fs::write(&stamp, &new_contents));
1205 deps.into_iter().map(|(d, _)| d).collect()
1208 pub fn stream_cargo(
1209 builder: &Builder<'_>,
1211 tail_args: Vec<String>,
1212 cb: &mut dyn FnMut(CargoMessage<'_>),
1214 let mut cargo = Command::from(cargo);
1215 if builder.config.dry_run {
1218 // Instruct Cargo to give us json messages on stdout, critically leaving
1219 // stderr as piped so we can get those pretty colors.
1220 let mut message_format = if builder.config.json_output {
1221 String::from("json")
1223 String::from("json-render-diagnostics")
1225 if let Some(s) = &builder.config.rustc_error_format {
1226 message_format.push_str(",json-diagnostic-");
1227 message_format.push_str(s);
1229 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1231 for arg in tail_args {
1235 builder.verbose(&format!("running: {:?}", cargo));
1236 let mut child = match cargo.spawn() {
1238 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1241 // Spawn Cargo slurping up its JSON output. We'll start building up the
1242 // `deps` array of all files it generated along with a `toplevel` array of
1243 // files we need to probe for later.
1244 let stdout = BufReader::new(child.stdout.take().unwrap());
1245 for line in stdout.lines() {
1246 let line = t!(line);
1247 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1249 if builder.config.json_output {
1250 // Forward JSON to stdout.
1251 println!("{}", line);
1255 // If this was informational, just print it out and continue
1256 Err(_) => println!("{}", line),
1260 // Make sure Cargo actually succeeded after we read all of its stdout.
1261 let status = t!(child.wait());
1262 if !status.success() {
1264 "command did not execute successfully: {:?}\n\
1265 expected success, got: {}",
1272 #[derive(Deserialize)]
1273 pub struct CargoTarget<'a> {
1274 crate_types: Vec<Cow<'a, str>>,
1277 #[derive(Deserialize)]
1278 #[serde(tag = "reason", rename_all = "kebab-case")]
1279 pub enum CargoMessage<'a> {
1281 package_id: Cow<'a, str>,
1282 features: Vec<Cow<'a, str>>,
1283 filenames: Vec<Cow<'a, str>>,
1284 target: CargoTarget<'a>,
1286 BuildScriptExecuted {
1287 package_id: Cow<'a, str>,