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 compile the standard library, libtest, and
6 //! the 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::{Command, Stdio};
19 use serde::Deserialize;
21 use crate::builder::crate_description;
22 use crate::builder::Cargo;
23 use crate::builder::{Builder, Kind, RunConfig, ShouldRun, Step};
24 use crate::cache::{Interned, INTERNER};
25 use crate::config::{LlvmLibunwind, RustcLto, TargetSelection};
28 use crate::tool::SourceType;
29 use crate::util::get_clang_cl_resource_dir;
30 use crate::util::{exe, is_debug_info, is_dylib, output, symlink_dir, t, up_to_date};
31 use crate::LLVM_TOOLS;
32 use crate::{CLang, Compiler, DependencyType, GitRepo, Mode};
34 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
36 pub target: TargetSelection,
37 pub compiler: Compiler,
38 /// Whether to build only a subset of crates in the standard library.
40 /// This shouldn't be used from other steps; see the comment on [`Rustc`].
41 crates: Interned<Vec<String>>,
45 pub fn new(compiler: Compiler, target: TargetSelection) -> Self {
46 Self { target, compiler, crates: Default::default() }
52 const DEFAULT: bool = true;
54 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
55 // When downloading stage1, the standard library has already been copied to the sysroot, so
56 // there's no need to rebuild it.
57 let builder = run.builder;
58 run.crate_or_deps("test")
60 .lazy_default_condition(Box::new(|| !builder.download_rustc()))
63 fn make_run(run: RunConfig<'_>) {
64 // Normally, people will pass *just* library if they pass it.
65 // But it's possible (although strange) to pass something like `library std core`.
66 // Build all crates anyway, as if they hadn't passed the other args.
68 run.paths.iter().any(|set| set.assert_single_path().path.ends_with("library"));
69 let crates = if has_library { Default::default() } else { run.cargo_crates_in_set() };
70 run.builder.ensure(Std {
71 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
77 /// Builds the standard library.
79 /// This will build the standard library for a particular stage of the build
80 /// using the `compiler` targeting the `target` architecture. The artifacts
81 /// created will also be linked into the sysroot directory.
82 fn run(self, builder: &Builder<'_>) {
83 let target = self.target;
84 let compiler = self.compiler;
86 // These artifacts were already copied (in `impl Step for Sysroot`).
87 // Don't recompile them.
88 // NOTE: the ABI of the beta compiler is different from the ABI of the downloaded compiler,
89 // so its artifacts can't be reused.
90 if builder.download_rustc() && compiler.stage != 0 {
94 if builder.config.keep_stage.contains(&compiler.stage)
95 || builder.config.keep_stage_std.contains(&compiler.stage)
97 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
98 builder.ensure(StdLink::from_std(self, compiler));
102 builder.update_submodule(&Path::new("library").join("stdarch"));
104 // Profiler information requires LLVM's compiler-rt
105 if builder.config.profiler {
106 builder.update_submodule(&Path::new("src/llvm-project"));
109 let mut target_deps = builder.ensure(StartupObjects { compiler, target });
111 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
112 if compiler_to_use != compiler {
113 builder.ensure(Std::new(compiler_to_use, target));
114 builder.info(&format!(
115 "Uplifting stage1 library ({} -> {})",
116 compiler_to_use.host, target
119 // Even if we're not building std this stage, the new sysroot must
120 // still contain the third party objects needed by various targets.
121 copy_third_party_objects(builder, &compiler, target);
122 copy_self_contained_objects(builder, &compiler, target);
124 builder.ensure(StdLink::from_std(self, compiler_to_use));
128 target_deps.extend(copy_third_party_objects(builder, &compiler, target));
129 target_deps.extend(copy_self_contained_objects(builder, &compiler, target));
131 let mut cargo = builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "build");
132 std_cargo(builder, target, compiler.stage, &mut cargo);
133 for krate in &*self.crates {
134 cargo.arg("-p").arg(krate);
137 builder.info(&format!(
138 "Building{} stage{} library artifacts ({} -> {})",
139 crate_description(&self.crates),
148 &libstd_stamp(builder, compiler, target),
154 builder.ensure(StdLink::from_std(
156 builder.compiler(compiler.stage, builder.config.build),
162 builder: &Builder<'_>,
166 target_deps: &mut Vec<(PathBuf, DependencyType)>,
167 dependency_type: DependencyType,
169 let target = libdir.join(name);
170 builder.copy(&sourcedir.join(name), &target);
172 target_deps.push((target, dependency_type));
175 fn copy_llvm_libunwind(builder: &Builder<'_>, target: TargetSelection, libdir: &Path) -> PathBuf {
176 let libunwind_path = builder.ensure(native::Libunwind { target });
177 let libunwind_source = libunwind_path.join("libunwind.a");
178 let libunwind_target = libdir.join("libunwind.a");
179 builder.copy(&libunwind_source, &libunwind_target);
183 /// Copies third party objects needed by various targets.
184 fn copy_third_party_objects(
185 builder: &Builder<'_>,
187 target: TargetSelection,
188 ) -> Vec<(PathBuf, DependencyType)> {
189 let mut target_deps = vec![];
191 // FIXME: remove this in 2021
192 if target == "x86_64-fortanix-unknown-sgx" {
193 if env::var_os("X86_FORTANIX_SGX_LIBS").is_some() {
194 builder.info("Warning: X86_FORTANIX_SGX_LIBS environment variable is ignored, libunwind is now compiled as part of rustbuild");
198 if builder.config.sanitizers_enabled(target) && compiler.stage != 0 {
199 // The sanitizers are only copied in stage1 or above,
200 // to avoid creating dependency on LLVM.
202 copy_sanitizers(builder, &compiler, target)
204 .map(|d| (d, DependencyType::Target)),
208 if target == "x86_64-fortanix-unknown-sgx"
209 || builder.config.llvm_libunwind(target) == LlvmLibunwind::InTree
210 && (target.contains("linux") || target.contains("fuchsia"))
213 copy_llvm_libunwind(builder, target, &builder.sysroot_libdir(*compiler, target));
214 target_deps.push((libunwind_path, DependencyType::Target));
220 /// Copies third party objects needed by various targets for self-contained linkage.
221 fn copy_self_contained_objects(
222 builder: &Builder<'_>,
224 target: TargetSelection,
225 ) -> Vec<(PathBuf, DependencyType)> {
226 let libdir_self_contained = builder.sysroot_libdir(*compiler, target).join("self-contained");
227 t!(fs::create_dir_all(&libdir_self_contained));
228 let mut target_deps = vec![];
230 // Copies the libc and CRT objects.
232 // rustc historically provides a more self-contained installation for musl targets
233 // not requiring the presence of a native musl toolchain. For example, it can fall back
234 // to using gcc from a glibc-targeting toolchain for linking.
235 // To do that we have to distribute musl startup objects as a part of Rust toolchain
236 // and link with them manually in the self-contained mode.
237 if target.contains("musl") {
238 let srcdir = builder.musl_libdir(target).unwrap_or_else(|| {
239 panic!("Target {:?} does not have a \"musl-libdir\" key", target.triple)
241 for &obj in &["libc.a", "crt1.o", "Scrt1.o", "rcrt1.o", "crti.o", "crtn.o"] {
244 &libdir_self_contained,
248 DependencyType::TargetSelfContained,
251 let crt_path = builder.ensure(native::CrtBeginEnd { target });
252 for &obj in &["crtbegin.o", "crtbeginS.o", "crtend.o", "crtendS.o"] {
253 let src = crt_path.join(obj);
254 let target = libdir_self_contained.join(obj);
255 builder.copy(&src, &target);
256 target_deps.push((target, DependencyType::TargetSelfContained));
259 if !target.starts_with("s390x") {
260 let libunwind_path = copy_llvm_libunwind(builder, target, &libdir_self_contained);
261 target_deps.push((libunwind_path, DependencyType::TargetSelfContained));
263 } else if target.ends_with("-wasi") {
267 panic!("Target {:?} does not have a \"wasi-root\" key", target.triple)
269 .join("lib/wasm32-wasi");
270 for &obj in &["libc.a", "crt1-command.o", "crt1-reactor.o"] {
273 &libdir_self_contained,
277 DependencyType::TargetSelfContained,
280 } else if target.ends_with("windows-gnu") {
281 for obj in ["crt2.o", "dllcrt2.o"].iter() {
282 let src = compiler_file(builder, builder.cc(target), target, CLang::C, obj);
283 let target = libdir_self_contained.join(obj);
284 builder.copy(&src, &target);
285 target_deps.push((target, DependencyType::TargetSelfContained));
292 /// Configure cargo to compile the standard library, adding appropriate env vars
294 pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, cargo: &mut Cargo) {
295 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
296 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
299 // Determine if we're going to compile in optimized C intrinsics to
300 // the `compiler-builtins` crate. These intrinsics live in LLVM's
301 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
302 // always checked out, so we need to conditionally look for this. (e.g. if
303 // an external LLVM is used we skip the LLVM submodule checkout).
305 // Note that this shouldn't affect the correctness of `compiler-builtins`,
306 // but only its speed. Some intrinsics in C haven't been translated to Rust
307 // yet but that's pretty rare. Other intrinsics have optimized
308 // implementations in C which have only had slower versions ported to Rust,
309 // so we favor the C version where we can, but it's not critical.
311 // If `compiler-rt` is available ensure that the `c` feature of the
312 // `compiler-builtins` crate is enabled and it's configured to learn where
313 // `compiler-rt` is located.
314 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
315 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
316 // Note that `libprofiler_builtins/build.rs` also computes this so if
317 // you're changing something here please also change that.
318 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
319 " compiler-builtins-c"
324 let mut features = String::new();
326 // Cranelift doesn't support `asm`.
327 if stage != 0 && builder.config.default_codegen_backend().unwrap_or_default() == "cranelift" {
328 features += " compiler-builtins-no-asm";
331 if builder.no_std(target) == Some(true) {
332 features += " compiler-builtins-mem";
333 if !target.starts_with("bpf") {
334 features.push_str(compiler_builtins_c_feature);
337 // for no-std targets we only compile a few no_std crates
339 .args(&["-p", "alloc"])
340 .arg("--manifest-path")
341 .arg(builder.src.join("library/alloc/Cargo.toml"))
345 features += &builder.std_features(target);
346 features.push_str(compiler_builtins_c_feature);
351 .arg("--manifest-path")
352 .arg(builder.src.join("library/test/Cargo.toml"));
354 // Help the libc crate compile by assisting it in finding various
355 // sysroot native libraries.
356 if target.contains("musl") {
357 if let Some(p) = builder.musl_libdir(target) {
358 let root = format!("native={}", p.to_str().unwrap());
359 cargo.rustflag("-L").rustflag(&root);
363 if target.ends_with("-wasi") {
364 if let Some(p) = builder.wasi_root(target) {
365 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
366 cargo.rustflag("-L").rustflag(&root);
371 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
372 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
373 // built with bitcode so that the produced rlibs can be used for both LTO
374 // builds (which use bitcode) and non-LTO builds (which use object code).
375 // So we override the override here!
377 // But we don't bother for the stage 0 compiler because it's never used
380 cargo.rustflag("-Cembed-bitcode=yes");
382 if builder.config.rust_lto == RustcLto::Off {
383 cargo.rustflag("-Clto=off");
386 // By default, rustc does not include unwind tables unless they are required
387 // for a particular target. They are not required by RISC-V targets, but
388 // compiling the standard library with them means that users can get
389 // backtraces without having to recompile the standard library themselves.
391 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
392 if target.contains("riscv") {
393 cargo.rustflag("-Cforce-unwind-tables=yes");
397 format!("-Zcrate-attr=doc(html_root_url=\"{}/\")", builder.doc_rust_lang_org_channel(),);
398 cargo.rustflag(&html_root);
399 cargo.rustdocflag(&html_root);
402 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
404 pub compiler: Compiler,
405 pub target_compiler: Compiler,
406 pub target: TargetSelection,
407 /// Not actually used; only present to make sure the cache invalidation is correct.
408 crates: Interned<Vec<String>>,
412 fn from_std(std: Std, host_compiler: Compiler) -> Self {
414 compiler: host_compiler,
415 target_compiler: std.compiler,
422 impl Step for StdLink {
425 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
429 /// Link all libstd rlibs/dylibs into the sysroot location.
431 /// Links those artifacts generated by `compiler` to the `stage` compiler's
432 /// sysroot for the specified `host` and `target`.
434 /// Note that this assumes that `compiler` has already generated the libstd
435 /// libraries for `target`, and this method will find them in the relevant
436 /// output directory.
437 fn run(self, builder: &Builder<'_>) {
438 let compiler = self.compiler;
439 let target_compiler = self.target_compiler;
440 let target = self.target;
441 builder.info(&format!(
442 "Copying stage{} library from stage{} ({} -> {} / {})",
443 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
445 let libdir = builder.sysroot_libdir(target_compiler, target);
446 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
447 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
451 /// Copies sanitizer runtime libraries into target libdir.
453 builder: &Builder<'_>,
455 target: TargetSelection,
457 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
459 if builder.config.dry_run() {
463 let mut target_deps = Vec::new();
464 let libdir = builder.sysroot_libdir(*compiler, target);
466 for runtime in &runtimes {
467 let dst = libdir.join(&runtime.name);
468 builder.copy(&runtime.path, &dst);
470 if target == "x86_64-apple-darwin" || target == "aarch64-apple-darwin" {
471 // Update the library’s install name to reflect that it has been renamed.
472 apple_darwin_update_library_name(&dst, &format!("@rpath/{}", &runtime.name));
473 // Upon renaming the install name, the code signature of the file will invalidate,
474 // so we will sign it again.
475 apple_darwin_sign_file(&dst);
478 target_deps.push(dst);
484 fn apple_darwin_update_library_name(library_path: &Path, new_name: &str) {
485 let status = Command::new("install_name_tool")
490 .expect("failed to execute `install_name_tool`");
491 assert!(status.success());
494 fn apple_darwin_sign_file(file_path: &Path) {
495 let status = Command::new("codesign")
496 .arg("-f") // Force to rewrite the existing signature
501 .expect("failed to execute `codesign`");
502 assert!(status.success());
505 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
506 pub struct StartupObjects {
507 pub compiler: Compiler,
508 pub target: TargetSelection,
511 impl Step for StartupObjects {
512 type Output = Vec<(PathBuf, DependencyType)>;
514 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
515 run.path("library/rtstartup")
518 fn make_run(run: RunConfig<'_>) {
519 run.builder.ensure(StartupObjects {
520 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
525 /// Builds and prepare startup objects like rsbegin.o and rsend.o
527 /// These are primarily used on Windows right now for linking executables/dlls.
528 /// They don't require any library support as they're just plain old object
529 /// files, so we just use the nightly snapshot compiler to always build them (as
530 /// no other compilers are guaranteed to be available).
531 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
532 let for_compiler = self.compiler;
533 let target = self.target;
534 if !target.ends_with("windows-gnu") {
538 let mut target_deps = vec![];
540 let src_dir = &builder.src.join("library").join("rtstartup");
541 let dst_dir = &builder.native_dir(target).join("rtstartup");
542 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
543 t!(fs::create_dir_all(dst_dir));
545 for file in &["rsbegin", "rsend"] {
546 let src_file = &src_dir.join(file.to_string() + ".rs");
547 let dst_file = &dst_dir.join(file.to_string() + ".o");
548 if !up_to_date(src_file, dst_file) {
549 let mut cmd = Command::new(&builder.initial_rustc);
550 cmd.env("RUSTC_BOOTSTRAP", "1");
551 if !builder.local_rebuild {
552 // a local_rebuild compiler already has stage1 features
553 cmd.arg("--cfg").arg("bootstrap");
557 .arg(target.rustc_target_arg())
565 let target = sysroot_dir.join((*file).to_string() + ".o");
566 builder.copy(dst_file, &target);
567 target_deps.push((target, DependencyType::Target));
574 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
576 pub target: TargetSelection,
577 pub compiler: Compiler,
578 /// Whether to build a subset of crates, rather than the whole compiler.
580 /// This should only be requested by the user, not used within rustbuild itself.
581 /// Using it within rustbuild can lead to confusing situation where lints are replayed
582 /// in two different steps.
583 crates: Interned<Vec<String>>,
587 pub fn new(compiler: Compiler, target: TargetSelection) -> Self {
588 Self { target, compiler, crates: Default::default() }
592 impl Step for Rustc {
594 const ONLY_HOSTS: bool = true;
595 const DEFAULT: bool = false;
597 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
598 let mut crates = run.builder.in_tree_crates("rustc-main", None);
599 for (i, krate) in crates.iter().enumerate() {
600 if krate.name == "rustc-main" {
601 crates.swap_remove(i);
608 fn make_run(run: RunConfig<'_>) {
609 let crates = run.cargo_crates_in_set();
610 run.builder.ensure(Rustc {
611 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
617 /// Builds the compiler.
619 /// This will build the compiler for a particular stage of the build using
620 /// the `compiler` targeting the `target` architecture. The artifacts
621 /// created will also be linked into the sysroot directory.
622 fn run(self, builder: &Builder<'_>) {
623 let compiler = self.compiler;
624 let target = self.target;
626 // NOTE: the ABI of the beta compiler is different from the ABI of the downloaded compiler,
627 // so its artifacts can't be reused.
628 if builder.download_rustc() && compiler.stage != 0 {
629 // Copy the existing artifacts instead of rebuilding them.
630 // NOTE: this path is only taken for tools linking to rustc-dev.
631 builder.ensure(Sysroot { compiler });
635 builder.ensure(Std::new(compiler, target));
637 if builder.config.keep_stage.contains(&compiler.stage) {
638 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
639 builder.info("Warning: Use `--keep-stage-std` if you want to rebuild the compiler when it changes");
640 builder.ensure(RustcLink::from_rustc(self, compiler));
644 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
645 if compiler_to_use != compiler {
646 builder.ensure(Rustc::new(compiler_to_use, target));
648 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
649 builder.ensure(RustcLink::from_rustc(self, compiler_to_use));
653 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
654 builder.ensure(Std::new(
655 builder.compiler(self.compiler.stage, builder.config.build),
656 builder.config.build,
659 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "build");
660 rustc_cargo(builder, &mut cargo, target);
662 if builder.config.rust_profile_use.is_some()
663 && builder.config.rust_profile_generate.is_some()
665 panic!("Cannot use and generate PGO profiles at the same time");
668 // With LLD, we can use ICF (identical code folding) to reduce the executable size
669 // of librustc_driver/rustc and to improve i-cache utilization.
671 // -Wl,[link options] doesn't work on MSVC. However, /OPT:ICF (technically /OPT:REF,ICF)
672 // is already on by default in MSVC optimized builds, which is interpreted as --icf=all:
673 // https://github.com/llvm/llvm-project/blob/3329cec2f79185bafd678f310fafadba2a8c76d2/lld/COFF/Driver.cpp#L1746
674 // https://github.com/rust-lang/rust/blob/f22819bcce4abaff7d1246a56eec493418f9f4ee/compiler/rustc_codegen_ssa/src/back/linker.rs#L827
675 if builder.config.use_lld && !compiler.host.contains("msvc") {
676 cargo.rustflag("-Clink-args=-Wl,--icf=all");
679 let is_collecting = if let Some(path) = &builder.config.rust_profile_generate {
680 if compiler.stage == 1 {
681 cargo.rustflag(&format!("-Cprofile-generate={}", path));
682 // Apparently necessary to avoid overflowing the counters during
683 // a Cargo build profile
684 cargo.rustflag("-Cllvm-args=-vp-counters-per-site=4");
689 } else if let Some(path) = &builder.config.rust_profile_use {
690 if compiler.stage == 1 {
691 cargo.rustflag(&format!("-Cprofile-use={}", path));
692 cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
701 // Ensure paths to Rust sources are relative, not absolute.
702 cargo.rustflag(&format!(
703 "-Cllvm-args=-static-func-strip-dirname-prefix={}",
704 builder.config.src.components().count()
708 // We currently don't support cross-crate LTO in stage0. This also isn't hugely necessary
709 // and may just be a time sink.
710 if compiler.stage != 0 {
711 match builder.config.rust_lto {
712 RustcLto::Thin | RustcLto::Fat => {
713 // Since using LTO for optimizing dylibs is currently experimental,
714 // we need to pass -Zdylib-lto.
715 cargo.rustflag("-Zdylib-lto");
716 // Cargo by default passes `-Cembed-bitcode=no` and doesn't pass `-Clto` when
717 // compiling dylibs (and their dependencies), even when LTO is enabled for the
718 // crate. Therefore, we need to override `-Clto` and `-Cembed-bitcode` here.
719 let lto_type = match builder.config.rust_lto {
720 RustcLto::Thin => "thin",
721 RustcLto::Fat => "fat",
724 cargo.rustflag(&format!("-Clto={}", lto_type));
725 cargo.rustflag("-Cembed-bitcode=yes");
727 RustcLto::ThinLocal => { /* Do nothing, this is the default */ }
729 cargo.rustflag("-Clto=off");
733 if builder.config.rust_lto == RustcLto::Off {
734 cargo.rustflag("-Clto=off");
738 for krate in &*self.crates {
739 cargo.arg("-p").arg(krate);
742 builder.info(&format!(
743 "Building{} stage{} compiler artifacts ({} -> {})",
744 crate_description(&self.crates),
753 &librustc_stamp(builder, compiler, target),
756 true, // Only ship rustc_driver.so and .rmeta files, not all intermediate .rlib files.
759 builder.ensure(RustcLink::from_rustc(
761 builder.compiler(compiler.stage, builder.config.build),
766 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
769 .arg(builder.rustc_features(builder.kind))
770 .arg("--manifest-path")
771 .arg(builder.src.join("compiler/rustc/Cargo.toml"));
772 rustc_cargo_env(builder, cargo, target);
775 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
776 // Set some configuration variables picked up by build scripts and
777 // the compiler alike
779 .env("CFG_RELEASE", builder.rust_release())
780 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
781 .env("CFG_VERSION", builder.rust_version());
783 if let Some(backend) = builder.config.default_codegen_backend() {
784 cargo.env("CFG_DEFAULT_CODEGEN_BACKEND", backend);
787 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
788 let target_config = builder.config.target_config.get(&target);
790 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
792 if let Some(ref ver_date) = builder.rust_info().commit_date() {
793 cargo.env("CFG_VER_DATE", ver_date);
795 if let Some(ref ver_hash) = builder.rust_info().sha() {
796 cargo.env("CFG_VER_HASH", ver_hash);
798 if !builder.unstable_features() {
799 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
802 // Prefer the current target's own default_linker, else a globally
804 if let Some(s) = target_config.and_then(|c| c.default_linker.as_ref()) {
805 cargo.env("CFG_DEFAULT_LINKER", s);
806 } else if let Some(ref s) = builder.config.rustc_default_linker {
807 cargo.env("CFG_DEFAULT_LINKER", s);
810 if builder.config.rustc_parallel {
811 // keep in sync with `bootstrap/lib.rs:Build::rustc_features`
812 // `cfg` option for rustc, `features` option for cargo, for conditional compilation
813 cargo.rustflag("--cfg=parallel_compiler");
814 cargo.rustdocflag("--cfg=parallel_compiler");
816 if builder.config.rust_verify_llvm_ir {
817 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
820 // Pass down configuration from the LLVM build into the build of
821 // rustc_llvm and rustc_codegen_llvm.
823 // Note that this is disabled if LLVM itself is disabled or we're in a check
824 // build. If we are in a check build we still go ahead here presuming we've
825 // detected that LLVM is already built and good to go which helps prevent
826 // busting caches (e.g. like #71152).
827 if builder.config.llvm_enabled()
828 && (builder.kind != Kind::Check
829 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
831 if builder.is_rust_llvm(target) {
832 cargo.env("LLVM_RUSTLLVM", "1");
834 let native::LlvmResult { llvm_config, .. } = builder.ensure(native::Llvm { target });
835 cargo.env("LLVM_CONFIG", &llvm_config);
836 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
837 cargo.env("CFG_LLVM_ROOT", s);
840 // Some LLVM linker flags (-L and -l) may be needed to link `rustc_llvm`. Its build script
841 // expects these to be passed via the `LLVM_LINKER_FLAGS` env variable, separated by
845 // - on windows, when `clang-cl` is used with instrumentation, we need to manually add
846 // clang's runtime library resource directory so that the profiler runtime library can be
847 // found. This is to avoid the linker errors about undefined references to
848 // `__llvm_profile_instrument_memop` when linking `rustc_driver`.
849 let mut llvm_linker_flags = String::new();
850 if builder.config.llvm_profile_generate && target.contains("msvc") {
851 if let Some(ref clang_cl_path) = builder.config.llvm_clang_cl {
852 // Add clang's runtime library directory to the search path
853 let clang_rt_dir = get_clang_cl_resource_dir(clang_cl_path);
854 llvm_linker_flags.push_str(&format!("-L{}", clang_rt_dir.display()));
858 // The config can also specify its own llvm linker flags.
859 if let Some(ref s) = builder.config.llvm_ldflags {
860 if !llvm_linker_flags.is_empty() {
861 llvm_linker_flags.push_str(" ");
863 llvm_linker_flags.push_str(s);
866 // Set the linker flags via the env var that `rustc_llvm`'s build script will read.
867 if !llvm_linker_flags.is_empty() {
868 cargo.env("LLVM_LINKER_FLAGS", llvm_linker_flags);
871 // Building with a static libstdc++ is only supported on linux right now,
872 // not for MSVC or macOS
873 if builder.config.llvm_static_stdcpp
874 && !target.contains("freebsd")
875 && !target.contains("msvc")
876 && !target.contains("apple")
877 && !target.contains("solaris")
879 let file = compiler_file(
881 builder.cxx(target).unwrap(),
886 cargo.env("LLVM_STATIC_STDCPP", file);
888 if builder.llvm_link_shared() {
889 cargo.env("LLVM_LINK_SHARED", "1");
891 if builder.config.llvm_use_libcxx {
892 cargo.env("LLVM_USE_LIBCXX", "1");
894 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
895 cargo.env("LLVM_NDEBUG", "1");
900 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
902 pub compiler: Compiler,
903 pub target_compiler: Compiler,
904 pub target: TargetSelection,
905 /// Not actually used; only present to make sure the cache invalidation is correct.
906 crates: Interned<Vec<String>>,
910 fn from_rustc(rustc: Rustc, host_compiler: Compiler) -> Self {
912 compiler: host_compiler,
913 target_compiler: rustc.compiler,
914 target: rustc.target,
915 crates: rustc.crates,
920 impl Step for RustcLink {
923 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
927 /// Same as `std_link`, only for librustc
928 fn run(self, builder: &Builder<'_>) {
929 let compiler = self.compiler;
930 let target_compiler = self.target_compiler;
931 let target = self.target;
932 builder.info(&format!(
933 "Copying stage{} rustc from stage{} ({} -> {} / {})",
934 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
938 &builder.sysroot_libdir(target_compiler, target),
939 &builder.sysroot_libdir(target_compiler, compiler.host),
940 &librustc_stamp(builder, compiler, target),
945 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
946 pub struct CodegenBackend {
947 pub target: TargetSelection,
948 pub compiler: Compiler,
949 pub backend: Interned<String>,
952 impl Step for CodegenBackend {
954 const ONLY_HOSTS: bool = true;
955 // Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
956 const DEFAULT: bool = true;
958 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
959 run.paths(&["compiler/rustc_codegen_cranelift", "compiler/rustc_codegen_gcc"])
962 fn make_run(run: RunConfig<'_>) {
963 for &backend in &run.builder.config.rust_codegen_backends {
964 if backend == "llvm" {
965 continue; // Already built as part of rustc
968 run.builder.ensure(CodegenBackend {
970 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
976 fn run(self, builder: &Builder<'_>) {
977 let compiler = self.compiler;
978 let target = self.target;
979 let backend = self.backend;
981 builder.ensure(Rustc::new(compiler, target));
983 if builder.config.keep_stage.contains(&compiler.stage) {
985 "Warning: Using a potentially old codegen backend. \
986 This may not behave well.",
988 // Codegen backends are linked separately from this step today, so we don't do
993 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
994 if compiler_to_use != compiler {
995 builder.ensure(CodegenBackend { compiler: compiler_to_use, target, backend });
999 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
1001 let mut cargo = builder.cargo(compiler, Mode::Codegen, SourceType::InTree, target, "build");
1003 .arg("--manifest-path")
1004 .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));
1005 rustc_cargo_env(builder, &mut cargo, target);
1007 let tmp_stamp = out_dir.join(".tmp.stamp");
1009 builder.info(&format!(
1010 "Building stage{} codegen backend {} ({} -> {})",
1011 compiler.stage, backend, &compiler.host, target
1013 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false, false);
1014 if builder.config.dry_run() {
1017 let mut files = files.into_iter().filter(|f| {
1018 let filename = f.file_name().unwrap().to_str().unwrap();
1019 is_dylib(filename) && filename.contains("rustc_codegen_")
1021 let codegen_backend = match files.next() {
1023 None => panic!("no dylibs built for codegen backend?"),
1025 if let Some(f) = files.next() {
1027 "codegen backend built two dylibs:\n{}\n{}",
1028 codegen_backend.display(),
1032 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
1033 let codegen_backend = codegen_backend.to_str().unwrap();
1034 t!(fs::write(&stamp, &codegen_backend));
1038 /// Creates the `codegen-backends` folder for a compiler that's about to be
1039 /// assembled as a complete compiler.
1041 /// This will take the codegen artifacts produced by `compiler` and link them
1042 /// into an appropriate location for `target_compiler` to be a functional
1044 fn copy_codegen_backends_to_sysroot(
1045 builder: &Builder<'_>,
1047 target_compiler: Compiler,
1049 let target = target_compiler.host;
1051 // Note that this step is different than all the other `*Link` steps in
1052 // that it's not assembling a bunch of libraries but rather is primarily
1053 // moving the codegen backend into place. The codegen backend of rustc is
1054 // not linked into the main compiler by default but is rather dynamically
1055 // selected at runtime for inclusion.
1057 // Here we're looking for the output dylib of the `CodegenBackend` step and
1058 // we're copying that into the `codegen-backends` folder.
1059 let dst = builder.sysroot_codegen_backends(target_compiler);
1060 t!(fs::create_dir_all(&dst), dst);
1062 if builder.config.dry_run() {
1066 for backend in builder.config.rust_codegen_backends.iter() {
1067 if backend == "llvm" {
1068 continue; // Already built as part of rustc
1071 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
1072 let dylib = t!(fs::read_to_string(&stamp));
1073 let file = Path::new(&dylib);
1074 let filename = file.file_name().unwrap().to_str().unwrap();
1075 // change `librustc_codegen_cranelift-xxxxxx.so` to
1076 // `librustc_codegen_cranelift-release.so`
1077 let target_filename = {
1078 let dash = filename.find('-').unwrap();
1079 let dot = filename.find('.').unwrap();
1080 format!("{}-{}{}", &filename[..dash], builder.rust_release(), &filename[dot..])
1082 builder.copy(&file, &dst.join(target_filename));
1086 /// Cargo's output path for the standard library in a given stage, compiled
1087 /// by a particular compiler for the specified target.
1088 pub fn libstd_stamp(builder: &Builder<'_>, compiler: Compiler, target: TargetSelection) -> PathBuf {
1089 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
1092 /// Cargo's output path for librustc in a given stage, compiled by a particular
1093 /// compiler for the specified target.
1094 pub fn librustc_stamp(
1095 builder: &Builder<'_>,
1097 target: TargetSelection,
1099 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
1102 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
1103 /// compiler for the specified target and backend.
1104 fn codegen_backend_stamp(
1105 builder: &Builder<'_>,
1107 target: TargetSelection,
1108 backend: Interned<String>,
1111 .cargo_out(compiler, Mode::Codegen, target)
1112 .join(format!(".librustc_codegen_{}.stamp", backend))
1115 pub fn compiler_file(
1116 builder: &Builder<'_>,
1118 target: TargetSelection,
1122 let mut cmd = Command::new(compiler);
1123 cmd.args(builder.cflags(target, GitRepo::Rustc, c));
1124 cmd.arg(format!("-print-file-name={}", file));
1125 let out = output(&mut cmd);
1126 PathBuf::from(out.trim())
1129 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1130 pub struct Sysroot {
1131 pub compiler: Compiler,
1134 impl Step for Sysroot {
1135 type Output = Interned<PathBuf>;
1137 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1141 /// Returns the sysroot for the `compiler` specified that *this build system
1144 /// That is, the sysroot for the stage0 compiler is not what the compiler
1145 /// thinks it is by default, but it's the same as the default for stages
1147 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
1148 let compiler = self.compiler;
1149 let host_dir = builder.out.join(&compiler.host.triple);
1151 let sysroot_dir = |stage| {
1153 host_dir.join("stage0-sysroot")
1154 } else if builder.download_rustc() && compiler.stage != builder.top_stage {
1155 host_dir.join("ci-rustc-sysroot")
1157 host_dir.join(format!("stage{}", stage))
1160 let sysroot = sysroot_dir(compiler.stage);
1162 let _ = fs::remove_dir_all(&sysroot);
1163 t!(fs::create_dir_all(&sysroot));
1165 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
1166 if builder.download_rustc() && compiler.stage != 0 {
1168 builder.config.build, compiler.host,
1169 "Cross-compiling is not yet supported with `download-rustc`",
1172 // #102002, cleanup old toolchain folders when using download-rustc so people don't use them by accident.
1173 for stage in 0..=2 {
1174 if stage != compiler.stage {
1175 let dir = sysroot_dir(stage);
1176 if !dir.ends_with("ci-rustc-sysroot") {
1177 let _ = fs::remove_dir_all(dir);
1182 // Copy the compiler into the correct sysroot.
1184 builder.config.out.join(&*builder.config.build.triple).join("ci-rustc");
1185 builder.cp_r(&ci_rustc_dir, &sysroot);
1186 return INTERNER.intern_path(sysroot);
1189 // Symlink the source root into the same location inside the sysroot,
1190 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
1191 // so that any tools relying on `rust-src` also work for local builds,
1192 // and also for translating the virtual `/rustc/$hash` back to the real
1193 // directory (for running tests with `rust.remap-debuginfo = true`).
1194 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
1195 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
1196 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
1197 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
1199 "warning: creating symbolic link `{}` to `{}` failed with {}",
1200 sysroot_lib_rustlib_src_rust.display(),
1201 builder.src.display(),
1204 if builder.config.rust_remap_debuginfo {
1206 "warning: some `tests/ui` tests will fail when lacking `{}`",
1207 sysroot_lib_rustlib_src_rust.display(),
1211 // Same for the rustc-src component.
1212 let sysroot_lib_rustlib_rustcsrc = sysroot.join("lib/rustlib/rustc-src");
1213 t!(fs::create_dir_all(&sysroot_lib_rustlib_rustcsrc));
1214 let sysroot_lib_rustlib_rustcsrc_rust = sysroot_lib_rustlib_rustcsrc.join("rust");
1216 symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_rustcsrc_rust)
1219 "warning: creating symbolic link `{}` to `{}` failed with {}",
1220 sysroot_lib_rustlib_rustcsrc_rust.display(),
1221 builder.src.display(),
1226 INTERNER.intern_path(sysroot)
1230 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
1231 pub struct Assemble {
1232 /// The compiler which we will produce in this step. Assemble itself will
1233 /// take care of ensuring that the necessary prerequisites to do so exist,
1234 /// that is, this target can be a stage2 compiler and Assemble will build
1235 /// previous stages for you.
1236 pub target_compiler: Compiler,
1239 impl Step for Assemble {
1240 type Output = Compiler;
1241 const ONLY_HOSTS: bool = true;
1243 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1244 run.path("compiler/rustc").path("compiler")
1247 fn make_run(run: RunConfig<'_>) {
1248 run.builder.ensure(Assemble {
1249 target_compiler: run.builder.compiler(run.builder.top_stage + 1, run.target),
1253 /// Prepare a new compiler from the artifacts in `stage`
1255 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
1256 /// must have been previously produced by the `stage - 1` builder.build
1258 fn run(self, builder: &Builder<'_>) -> Compiler {
1259 let target_compiler = self.target_compiler;
1261 if target_compiler.stage == 0 {
1263 builder.config.build, target_compiler.host,
1264 "Cannot obtain compiler for non-native build triple at stage 0"
1266 // The stage 0 compiler for the build triple is always pre-built.
1267 return target_compiler;
1270 // Get the compiler that we'll use to bootstrap ourselves.
1272 // Note that this is where the recursive nature of the bootstrap
1273 // happens, as this will request the previous stage's compiler on
1274 // downwards to stage 0.
1276 // Also note that we're building a compiler for the host platform. We
1277 // only assume that we can run `build` artifacts, which means that to
1278 // produce some other architecture compiler we need to start from
1279 // `build` to get there.
1281 // FIXME: It may be faster if we build just a stage 1 compiler and then
1282 // use that to bootstrap this compiler forward.
1283 let build_compiler = builder.compiler(target_compiler.stage - 1, builder.config.build);
1285 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
1286 if builder.download_rustc() {
1287 builder.ensure(Sysroot { compiler: target_compiler });
1288 return target_compiler;
1291 // Build the libraries for this compiler to link to (i.e., the libraries
1292 // it uses at runtime). NOTE: Crates the target compiler compiles don't
1293 // link to these. (FIXME: Is that correct? It seems to be correct most
1294 // of the time but I think we do link to these for stage2/bin compilers
1295 // when not performing a full bootstrap).
1296 builder.ensure(Rustc::new(build_compiler, target_compiler.host));
1298 for &backend in builder.config.rust_codegen_backends.iter() {
1299 if backend == "llvm" {
1300 continue; // Already built as part of rustc
1303 builder.ensure(CodegenBackend {
1304 compiler: build_compiler,
1305 target: target_compiler.host,
1310 let lld_install = if builder.config.lld_enabled {
1311 Some(builder.ensure(native::Lld { target: target_compiler.host }))
1316 let stage = target_compiler.stage;
1317 let host = target_compiler.host;
1318 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
1320 // Link in all dylibs to the libdir
1321 let stamp = librustc_stamp(builder, build_compiler, target_compiler.host);
1322 let proc_macros = builder
1323 .read_stamp_file(&stamp)
1325 .filter_map(|(path, dependency_type)| {
1326 if dependency_type == DependencyType::Host {
1327 Some(path.file_name().unwrap().to_owned().into_string().unwrap())
1332 .collect::<HashSet<_>>();
1334 let sysroot = builder.sysroot(target_compiler);
1335 let rustc_libdir = builder.rustc_libdir(target_compiler);
1336 t!(fs::create_dir_all(&rustc_libdir));
1337 let src_libdir = builder.sysroot_libdir(build_compiler, host);
1338 for f in builder.read_dir(&src_libdir) {
1339 let filename = f.file_name().into_string().unwrap();
1340 if (is_dylib(&filename) || is_debug_info(&filename)) && !proc_macros.contains(&filename)
1342 builder.copy(&f.path(), &rustc_libdir.join(&filename));
1346 copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
1348 // We prepend this bin directory to the user PATH when linking Rust binaries. To
1349 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
1350 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
1351 let libdir_bin = libdir.parent().unwrap().join("bin");
1352 t!(fs::create_dir_all(&libdir_bin));
1353 if let Some(lld_install) = lld_install {
1354 let src_exe = exe("lld", target_compiler.host);
1355 let dst_exe = exe("rust-lld", target_compiler.host);
1356 builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
1357 // for `-Z gcc-ld=lld`
1358 let gcc_ld_dir = libdir_bin.join("gcc-ld");
1359 t!(fs::create_dir(&gcc_ld_dir));
1360 let lld_wrapper_exe = builder.ensure(crate::tool::LldWrapper {
1361 compiler: build_compiler,
1362 target: target_compiler.host,
1364 for name in crate::LLD_FILE_NAMES {
1365 builder.copy(&lld_wrapper_exe, &gcc_ld_dir.join(exe(name, target_compiler.host)));
1369 if builder.config.rust_codegen_backends.contains(&INTERNER.intern_str("llvm")) {
1370 let native::LlvmResult { llvm_config, .. } =
1371 builder.ensure(native::Llvm { target: target_compiler.host });
1372 if !builder.config.dry_run() {
1373 let llvm_bin_dir = output(Command::new(llvm_config).arg("--bindir"));
1374 let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
1376 // Since we've already built the LLVM tools, install them to the sysroot.
1377 // This is the equivalent of installing the `llvm-tools-preview` component via
1378 // rustup, and lets developers use a locally built toolchain to
1379 // build projects that expect llvm tools to be present in the sysroot
1380 // (e.g. the `bootimage` crate).
1381 for tool in LLVM_TOOLS {
1382 let tool_exe = exe(tool, target_compiler.host);
1383 let src_path = llvm_bin_dir.join(&tool_exe);
1384 // When using `download-ci-llvm`, some of the tools
1385 // may not exist, so skip trying to copy them.
1386 if src_path.exists() {
1387 builder.copy(&src_path, &libdir_bin.join(&tool_exe));
1393 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
1394 // so that it can be found when the newly built `rustc` is run.
1395 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
1396 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
1398 // Link the compiler binary itself into place
1399 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1400 let rustc = out_dir.join(exe("rustc-main", host));
1401 let bindir = sysroot.join("bin");
1402 t!(fs::create_dir_all(&bindir));
1403 let compiler = builder.rustc(target_compiler);
1404 builder.copy(&rustc, &compiler);
1410 /// Link some files into a rustc sysroot.
1412 /// For a particular stage this will link the file listed in `stamp` into the
1413 /// `sysroot_dst` provided.
1414 pub fn add_to_sysroot(
1415 builder: &Builder<'_>,
1417 sysroot_host_dst: &Path,
1420 let self_contained_dst = &sysroot_dst.join("self-contained");
1421 t!(fs::create_dir_all(&sysroot_dst));
1422 t!(fs::create_dir_all(&sysroot_host_dst));
1423 t!(fs::create_dir_all(&self_contained_dst));
1424 for (path, dependency_type) in builder.read_stamp_file(stamp) {
1425 let dst = match dependency_type {
1426 DependencyType::Host => sysroot_host_dst,
1427 DependencyType::Target => sysroot_dst,
1428 DependencyType::TargetSelfContained => self_contained_dst,
1430 builder.copy(&path, &dst.join(path.file_name().unwrap()));
1435 builder: &Builder<'_>,
1437 tail_args: Vec<String>,
1439 additional_target_deps: Vec<(PathBuf, DependencyType)>,
1441 rlib_only_metadata: bool,
1443 if builder.config.dry_run() {
1447 // `target_root_dir` looks like $dir/$target/release
1448 let target_root_dir = stamp.parent().unwrap();
1449 // `target_deps_dir` looks like $dir/$target/release/deps
1450 let target_deps_dir = target_root_dir.join("deps");
1451 // `host_root_dir` looks like $dir/release
1452 let host_root_dir = target_root_dir
1454 .unwrap() // chop off `release`
1456 .unwrap() // chop off `$target`
1457 .join(target_root_dir.file_name().unwrap());
1459 // Spawn Cargo slurping up its JSON output. We'll start building up the
1460 // `deps` array of all files it generated along with a `toplevel` array of
1461 // files we need to probe for later.
1462 let mut deps = Vec::new();
1463 let mut toplevel = Vec::new();
1464 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1465 let (filenames, crate_types) = match msg {
1466 CargoMessage::CompilerArtifact {
1468 target: CargoTarget { crate_types },
1470 } => (filenames, crate_types),
1473 for filename in filenames {
1474 // Skip files like executables
1475 let mut keep = false;
1476 if filename.ends_with(".lib")
1477 || filename.ends_with(".a")
1478 || is_debug_info(&filename)
1479 || is_dylib(&filename)
1481 // Always keep native libraries, rust dylibs and debuginfo
1484 if is_check && filename.ends_with(".rmeta") {
1485 // During check builds we need to keep crate metadata
1487 } else if rlib_only_metadata {
1488 if filename.contains("jemalloc_sys") || filename.contains("rustc_smir") {
1489 // jemalloc_sys and rustc_smir are not linked into librustc_driver.so,
1490 // so we need to distribute them as rlib to be able to use them.
1491 keep |= filename.ends_with(".rlib");
1493 // Distribute the rest of the rustc crates as rmeta files only to reduce
1494 // the tarball sizes by about 50%. The object files are linked into
1495 // librustc_driver.so, so it is still possible to link against them.
1496 keep |= filename.ends_with(".rmeta");
1499 // In all other cases keep all rlibs
1500 keep |= filename.ends_with(".rlib");
1507 let filename = Path::new(&*filename);
1509 // If this was an output file in the "host dir" we don't actually
1510 // worry about it, it's not relevant for us
1511 if filename.starts_with(&host_root_dir) {
1512 // Unless it's a proc macro used in the compiler
1513 if crate_types.iter().any(|t| t == "proc-macro") {
1514 deps.push((filename.to_path_buf(), DependencyType::Host));
1519 // If this was output in the `deps` dir then this is a precise file
1520 // name (hash included) so we start tracking it.
1521 if filename.starts_with(&target_deps_dir) {
1522 deps.push((filename.to_path_buf(), DependencyType::Target));
1526 // Otherwise this was a "top level artifact" which right now doesn't
1527 // have a hash in the name, but there's a version of this file in
1528 // the `deps` folder which *does* have a hash in the name. That's
1529 // the one we'll want to we'll probe for it later.
1531 // We do not use `Path::file_stem` or `Path::extension` here,
1532 // because some generated files may have multiple extensions e.g.
1533 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1534 // split the file name by the last extension (`.lib`) while we need
1535 // to split by all extensions (`.dll.lib`).
1536 let expected_len = t!(filename.metadata()).len();
1537 let filename = filename.file_name().unwrap().to_str().unwrap();
1538 let mut parts = filename.splitn(2, '.');
1539 let file_stem = parts.next().unwrap().to_owned();
1540 let extension = parts.next().unwrap().to_owned();
1542 toplevel.push((file_stem, extension, expected_len));
1547 crate::detail_exit(1);
1550 // Ok now we need to actually find all the files listed in `toplevel`. We've
1551 // got a list of prefix/extensions and we basically just need to find the
1552 // most recent file in the `deps` folder corresponding to each one.
1553 let contents = t!(target_deps_dir.read_dir())
1555 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1556 .collect::<Vec<_>>();
1557 for (prefix, extension, expected_len) in toplevel {
1558 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1559 meta.len() == expected_len
1561 .strip_prefix(&prefix[..])
1562 .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
1565 let max = candidates.max_by_key(|&&(_, _, ref metadata)| {
1566 metadata.modified().expect("mtime should be available on all relevant OSes")
1568 let path_to_add = match max {
1569 Some(triple) => triple.0.to_str().unwrap(),
1570 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1572 if is_dylib(path_to_add) {
1573 let candidate = format!("{}.lib", path_to_add);
1574 let candidate = PathBuf::from(candidate);
1575 if candidate.exists() {
1576 deps.push((candidate, DependencyType::Target));
1579 deps.push((path_to_add.into(), DependencyType::Target));
1582 deps.extend(additional_target_deps);
1584 let mut new_contents = Vec::new();
1585 for (dep, dependency_type) in deps.iter() {
1586 new_contents.extend(match *dependency_type {
1587 DependencyType::Host => b"h",
1588 DependencyType::Target => b"t",
1589 DependencyType::TargetSelfContained => b"s",
1591 new_contents.extend(dep.to_str().unwrap().as_bytes());
1592 new_contents.extend(b"\0");
1594 t!(fs::write(&stamp, &new_contents));
1595 deps.into_iter().map(|(d, _)| d).collect()
1598 pub fn stream_cargo(
1599 builder: &Builder<'_>,
1601 tail_args: Vec<String>,
1602 cb: &mut dyn FnMut(CargoMessage<'_>),
1604 let mut cargo = Command::from(cargo);
1605 if builder.config.dry_run() {
1608 // Instruct Cargo to give us json messages on stdout, critically leaving
1609 // stderr as piped so we can get those pretty colors.
1610 let mut message_format = if builder.config.json_output {
1611 String::from("json")
1613 String::from("json-render-diagnostics")
1615 if let Some(s) = &builder.config.rustc_error_format {
1616 message_format.push_str(",json-diagnostic-");
1617 message_format.push_str(s);
1619 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1621 for arg in tail_args {
1625 builder.verbose(&format!("running: {:?}", cargo));
1626 let mut child = match cargo.spawn() {
1628 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1631 // Spawn Cargo slurping up its JSON output. We'll start building up the
1632 // `deps` array of all files it generated along with a `toplevel` array of
1633 // files we need to probe for later.
1634 let stdout = BufReader::new(child.stdout.take().unwrap());
1635 for line in stdout.lines() {
1636 let line = t!(line);
1637 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1639 if builder.config.json_output {
1640 // Forward JSON to stdout.
1641 println!("{}", line);
1645 // If this was informational, just print it out and continue
1646 Err(_) => println!("{}", line),
1650 // Make sure Cargo actually succeeded after we read all of its stdout.
1651 let status = t!(child.wait());
1652 if builder.is_verbose() && !status.success() {
1654 "command did not execute successfully: {:?}\n\
1655 expected success, got: {}",
1662 #[derive(Deserialize)]
1663 pub struct CargoTarget<'a> {
1664 crate_types: Vec<Cow<'a, str>>,
1667 #[derive(Deserialize)]
1668 #[serde(tag = "reason", rename_all = "kebab-case")]
1669 pub enum CargoMessage<'a> {
1671 package_id: Cow<'a, str>,
1672 features: Vec<Cow<'a, str>>,
1673 filenames: Vec<Cow<'a, str>>,
1674 target: CargoTarget<'a>,
1676 BuildScriptExecuted {
1677 package_id: Cow<'a, str>,