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::Cargo;
22 use crate::builder::{Builder, Kind, RunConfig, ShouldRun, Step};
23 use crate::cache::{Interned, INTERNER};
24 use crate::config::{LlvmLibunwind, TargetSelection};
27 use crate::tool::SourceType;
28 use crate::util::get_clang_cl_resource_dir;
29 use crate::util::{exe, is_debug_info, is_dylib, output, symlink_dir, t, up_to_date};
30 use crate::LLVM_TOOLS;
31 use crate::{CLang, Compiler, DependencyType, GitRepo, Mode};
33 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
35 pub target: TargetSelection,
36 pub compiler: Compiler,
37 /// Whether to build only a subset of crates in the standard library.
39 /// This shouldn't be used from other steps; see the comment on [`Rustc`].
40 crates: Interned<Vec<String>>,
44 pub fn new(compiler: Compiler, target: TargetSelection) -> Self {
45 Self { target, compiler, crates: Default::default() }
49 /// Return a `-p=x -p=y` string suitable for passing to a cargo invocation.
50 fn build_crates_in_set(run: &RunConfig<'_>) -> Interned<Vec<String>> {
51 let mut crates = Vec::new();
52 for krate in &run.paths {
53 let path = krate.assert_single_path();
54 let crate_name = run.builder.crate_paths[&path.path];
55 crates.push(format!("-p={crate_name}"));
57 INTERNER.intern_list(crates)
62 const DEFAULT: bool = true;
64 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
65 // When downloading stage1, the standard library has already been copied to the sysroot, so
66 // there's no need to rebuild it.
67 let builder = run.builder;
68 run.crate_or_deps("test")
70 .lazy_default_condition(Box::new(|| !builder.download_rustc()))
73 fn make_run(run: RunConfig<'_>) {
74 // Normally, people will pass *just* library if they pass it.
75 // But it's possible (although strange) to pass something like `library std core`.
76 // Build all crates anyway, as if they hadn't passed the other args.
78 run.paths.iter().any(|set| set.assert_single_path().path.ends_with("library"));
79 let crates = if has_library { Default::default() } else { build_crates_in_set(&run) };
80 run.builder.ensure(Std {
81 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
87 /// Builds the standard library.
89 /// This will build the standard library for a particular stage of the build
90 /// using the `compiler` targeting the `target` architecture. The artifacts
91 /// created will also be linked into the sysroot directory.
92 fn run(self, builder: &Builder<'_>) {
93 let target = self.target;
94 let compiler = self.compiler;
96 // These artifacts were already copied (in `impl Step for Sysroot`).
97 // Don't recompile them.
98 // NOTE: the ABI of the beta compiler is different from the ABI of the downloaded compiler,
99 // so its artifacts can't be reused.
100 if builder.download_rustc() && compiler.stage != 0 {
104 if builder.config.keep_stage.contains(&compiler.stage)
105 || builder.config.keep_stage_std.contains(&compiler.stage)
107 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
108 builder.ensure(StdLink::from_std(self, compiler));
112 builder.update_submodule(&Path::new("library").join("stdarch"));
114 let mut target_deps = builder.ensure(StartupObjects { compiler, target });
116 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
117 if compiler_to_use != compiler {
118 builder.ensure(Std::new(compiler_to_use, target));
119 builder.info(&format!("Uplifting stage1 std ({} -> {})", compiler_to_use.host, target));
121 // Even if we're not building std this stage, the new sysroot must
122 // still contain the third party objects needed by various targets.
123 copy_third_party_objects(builder, &compiler, target);
124 copy_self_contained_objects(builder, &compiler, target);
126 builder.ensure(StdLink::from_std(self, compiler_to_use));
130 target_deps.extend(copy_third_party_objects(builder, &compiler, target));
131 target_deps.extend(copy_self_contained_objects(builder, &compiler, target));
133 let mut cargo = builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "build");
134 std_cargo(builder, target, compiler.stage, &mut cargo);
136 builder.info(&format!(
137 "Building stage{} std artifacts ({} -> {})",
138 compiler.stage, &compiler.host, target
143 self.crates.to_vec(),
144 &libstd_stamp(builder, compiler, target),
149 builder.ensure(StdLink::from_std(
151 builder.compiler(compiler.stage, builder.config.build),
157 builder: &Builder<'_>,
161 target_deps: &mut Vec<(PathBuf, DependencyType)>,
162 dependency_type: DependencyType,
164 let target = libdir.join(name);
165 builder.copy(&sourcedir.join(name), &target);
167 target_deps.push((target, dependency_type));
170 fn copy_llvm_libunwind(builder: &Builder<'_>, target: TargetSelection, libdir: &Path) -> PathBuf {
171 let libunwind_path = builder.ensure(native::Libunwind { target });
172 let libunwind_source = libunwind_path.join("libunwind.a");
173 let libunwind_target = libdir.join("libunwind.a");
174 builder.copy(&libunwind_source, &libunwind_target);
178 /// Copies third party objects needed by various targets.
179 fn copy_third_party_objects(
180 builder: &Builder<'_>,
182 target: TargetSelection,
183 ) -> Vec<(PathBuf, DependencyType)> {
184 let mut target_deps = vec![];
186 // FIXME: remove this in 2021
187 if target == "x86_64-fortanix-unknown-sgx" {
188 if env::var_os("X86_FORTANIX_SGX_LIBS").is_some() {
189 builder.info("Warning: X86_FORTANIX_SGX_LIBS environment variable is ignored, libunwind is now compiled as part of rustbuild");
193 if builder.config.sanitizers_enabled(target) && compiler.stage != 0 {
194 // The sanitizers are only copied in stage1 or above,
195 // to avoid creating dependency on LLVM.
197 copy_sanitizers(builder, &compiler, target)
199 .map(|d| (d, DependencyType::Target)),
203 if target == "x86_64-fortanix-unknown-sgx"
204 || target.contains("pc-windows-gnullvm")
205 || builder.config.llvm_libunwind(target) == LlvmLibunwind::InTree
206 && (target.contains("linux") || target.contains("fuchsia"))
209 copy_llvm_libunwind(builder, target, &builder.sysroot_libdir(*compiler, target));
210 target_deps.push((libunwind_path, DependencyType::Target));
216 /// Copies third party objects needed by various targets for self-contained linkage.
217 fn copy_self_contained_objects(
218 builder: &Builder<'_>,
220 target: TargetSelection,
221 ) -> Vec<(PathBuf, DependencyType)> {
222 let libdir_self_contained = builder.sysroot_libdir(*compiler, target).join("self-contained");
223 t!(fs::create_dir_all(&libdir_self_contained));
224 let mut target_deps = vec![];
226 // Copies the libc and CRT objects.
228 // rustc historically provides a more self-contained installation for musl targets
229 // not requiring the presence of a native musl toolchain. For example, it can fall back
230 // to using gcc from a glibc-targeting toolchain for linking.
231 // To do that we have to distribute musl startup objects as a part of Rust toolchain
232 // and link with them manually in the self-contained mode.
233 if target.contains("musl") {
234 let srcdir = builder.musl_libdir(target).unwrap_or_else(|| {
235 panic!("Target {:?} does not have a \"musl-libdir\" key", target.triple)
237 for &obj in &["libc.a", "crt1.o", "Scrt1.o", "rcrt1.o", "crti.o", "crtn.o"] {
240 &libdir_self_contained,
244 DependencyType::TargetSelfContained,
247 let crt_path = builder.ensure(native::CrtBeginEnd { target });
248 for &obj in &["crtbegin.o", "crtbeginS.o", "crtend.o", "crtendS.o"] {
249 let src = crt_path.join(obj);
250 let target = libdir_self_contained.join(obj);
251 builder.copy(&src, &target);
252 target_deps.push((target, DependencyType::TargetSelfContained));
255 if !target.starts_with("s390x") {
256 let libunwind_path = copy_llvm_libunwind(builder, target, &libdir_self_contained);
257 target_deps.push((libunwind_path, DependencyType::TargetSelfContained));
259 } else if target.ends_with("-wasi") {
263 panic!("Target {:?} does not have a \"wasi-root\" key", target.triple)
265 .join("lib/wasm32-wasi");
266 for &obj in &["libc.a", "crt1-command.o", "crt1-reactor.o"] {
269 &libdir_self_contained,
273 DependencyType::TargetSelfContained,
276 } else if target.ends_with("windows-gnu") {
277 for obj in ["crt2.o", "dllcrt2.o"].iter() {
278 let src = compiler_file(builder, builder.cc(target), target, CLang::C, obj);
279 let target = libdir_self_contained.join(obj);
280 builder.copy(&src, &target);
281 target_deps.push((target, DependencyType::TargetSelfContained));
288 /// Configure cargo to compile the standard library, adding appropriate env vars
290 pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, cargo: &mut Cargo) {
291 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
292 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
295 // Determine if we're going to compile in optimized C intrinsics to
296 // the `compiler-builtins` crate. These intrinsics live in LLVM's
297 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
298 // always checked out, so we need to conditionally look for this. (e.g. if
299 // an external LLVM is used we skip the LLVM submodule checkout).
301 // Note that this shouldn't affect the correctness of `compiler-builtins`,
302 // but only its speed. Some intrinsics in C haven't been translated to Rust
303 // yet but that's pretty rare. Other intrinsics have optimized
304 // implementations in C which have only had slower versions ported to Rust,
305 // so we favor the C version where we can, but it's not critical.
307 // If `compiler-rt` is available ensure that the `c` feature of the
308 // `compiler-builtins` crate is enabled and it's configured to learn where
309 // `compiler-rt` is located.
310 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
311 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
312 // Note that `libprofiler_builtins/build.rs` also computes this so if
313 // you're changing something here please also change that.
314 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
315 " compiler-builtins-c"
320 if builder.no_std(target) == Some(true) {
321 let mut features = "compiler-builtins-mem".to_string();
322 if !target.starts_with("bpf") {
323 features.push_str(compiler_builtins_c_feature);
326 // for no-std targets we only compile a few no_std crates
328 .args(&["-p", "alloc"])
329 .arg("--manifest-path")
330 .arg(builder.src.join("library/alloc/Cargo.toml"))
334 let mut features = builder.std_features(target);
335 features.push_str(compiler_builtins_c_feature);
340 .arg("--manifest-path")
341 .arg(builder.src.join("library/test/Cargo.toml"));
343 // Help the libc crate compile by assisting it in finding various
344 // sysroot native libraries.
345 if target.contains("musl") {
346 if let Some(p) = builder.musl_libdir(target) {
347 let root = format!("native={}", p.to_str().unwrap());
348 cargo.rustflag("-L").rustflag(&root);
352 if target.ends_with("-wasi") {
353 if let Some(p) = builder.wasi_root(target) {
354 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
355 cargo.rustflag("-L").rustflag(&root);
360 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
361 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
362 // built with bitcode so that the produced rlibs can be used for both LTO
363 // builds (which use bitcode) and non-LTO builds (which use object code).
364 // So we override the override here!
366 // But we don't bother for the stage 0 compiler because it's never used
369 cargo.rustflag("-Cembed-bitcode=yes");
372 // By default, rustc does not include unwind tables unless they are required
373 // for a particular target. They are not required by RISC-V targets, but
374 // compiling the standard library with them means that users can get
375 // backtraces without having to recompile the standard library themselves.
377 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
378 if target.contains("riscv") {
379 cargo.rustflag("-Cforce-unwind-tables=yes");
383 format!("-Zcrate-attr=doc(html_root_url=\"{}/\")", builder.doc_rust_lang_org_channel(),);
384 cargo.rustflag(&html_root);
385 cargo.rustdocflag(&html_root);
388 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
390 pub compiler: Compiler,
391 pub target_compiler: Compiler,
392 pub target: TargetSelection,
393 /// Not actually used; only present to make sure the cache invalidation is correct.
394 crates: Interned<Vec<String>>,
398 fn from_std(std: Std, host_compiler: Compiler) -> Self {
400 compiler: host_compiler,
401 target_compiler: std.compiler,
408 impl Step for StdLink {
411 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
415 /// Link all libstd rlibs/dylibs into the sysroot location.
417 /// Links those artifacts generated by `compiler` to the `stage` compiler's
418 /// sysroot for the specified `host` and `target`.
420 /// Note that this assumes that `compiler` has already generated the libstd
421 /// libraries for `target`, and this method will find them in the relevant
422 /// output directory.
423 fn run(self, builder: &Builder<'_>) {
424 let compiler = self.compiler;
425 let target_compiler = self.target_compiler;
426 let target = self.target;
427 builder.info(&format!(
428 "Copying stage{} std from stage{} ({} -> {} / {})",
429 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
431 let libdir = builder.sysroot_libdir(target_compiler, target);
432 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
433 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
437 /// Copies sanitizer runtime libraries into target libdir.
439 builder: &Builder<'_>,
441 target: TargetSelection,
443 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
445 if builder.config.dry_run {
449 let mut target_deps = Vec::new();
450 let libdir = builder.sysroot_libdir(*compiler, target);
452 for runtime in &runtimes {
453 let dst = libdir.join(&runtime.name);
454 builder.copy(&runtime.path, &dst);
456 if target == "x86_64-apple-darwin" || target == "aarch64-apple-darwin" {
457 // Update the library’s install name to reflect that it has has been renamed.
458 apple_darwin_update_library_name(&dst, &format!("@rpath/{}", &runtime.name));
459 // Upon renaming the install name, the code signature of the file will invalidate,
460 // so we will sign it again.
461 apple_darwin_sign_file(&dst);
464 target_deps.push(dst);
470 fn apple_darwin_update_library_name(library_path: &Path, new_name: &str) {
471 let status = Command::new("install_name_tool")
476 .expect("failed to execute `install_name_tool`");
477 assert!(status.success());
480 fn apple_darwin_sign_file(file_path: &Path) {
481 let status = Command::new("codesign")
482 .arg("-f") // Force to rewrite the existing signature
487 .expect("failed to execute `codesign`");
488 assert!(status.success());
491 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
492 pub struct StartupObjects {
493 pub compiler: Compiler,
494 pub target: TargetSelection,
497 impl Step for StartupObjects {
498 type Output = Vec<(PathBuf, DependencyType)>;
500 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
501 run.path("library/rtstartup")
504 fn make_run(run: RunConfig<'_>) {
505 run.builder.ensure(StartupObjects {
506 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
511 /// Builds and prepare startup objects like rsbegin.o and rsend.o
513 /// These are primarily used on Windows right now for linking executables/dlls.
514 /// They don't require any library support as they're just plain old object
515 /// files, so we just use the nightly snapshot compiler to always build them (as
516 /// no other compilers are guaranteed to be available).
517 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
518 let for_compiler = self.compiler;
519 let target = self.target;
520 if !target.ends_with("windows-gnu") {
524 let mut target_deps = vec![];
526 let src_dir = &builder.src.join("library").join("rtstartup");
527 let dst_dir = &builder.native_dir(target).join("rtstartup");
528 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
529 t!(fs::create_dir_all(dst_dir));
531 for file in &["rsbegin", "rsend"] {
532 let src_file = &src_dir.join(file.to_string() + ".rs");
533 let dst_file = &dst_dir.join(file.to_string() + ".o");
534 if !up_to_date(src_file, dst_file) {
535 let mut cmd = Command::new(&builder.initial_rustc);
536 cmd.env("RUSTC_BOOTSTRAP", "1");
537 if !builder.local_rebuild {
538 // a local_rebuild compiler already has stage1 features
539 cmd.arg("--cfg").arg("bootstrap");
543 .arg(target.rustc_target_arg())
551 let target = sysroot_dir.join((*file).to_string() + ".o");
552 builder.copy(dst_file, &target);
553 target_deps.push((target, DependencyType::Target));
560 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
562 pub target: TargetSelection,
563 pub compiler: Compiler,
564 /// Whether to build a subset of crates, rather than the whole compiler.
566 /// This should only be requested by the user, not used within rustbuild itself.
567 /// Using it within rustbuild can lead to confusing situation where lints are replayed
568 /// in two different steps.
569 crates: Interned<Vec<String>>,
573 pub fn new(compiler: Compiler, target: TargetSelection) -> Self {
574 Self { target, compiler, crates: Default::default() }
578 impl Step for Rustc {
580 const ONLY_HOSTS: bool = true;
581 const DEFAULT: bool = false;
583 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
584 let mut crates = run.builder.in_tree_crates("rustc-main", None);
585 for (i, krate) in crates.iter().enumerate() {
586 if krate.name == "rustc-main" {
587 crates.swap_remove(i);
594 fn make_run(run: RunConfig<'_>) {
595 let crates = build_crates_in_set(&run);
596 run.builder.ensure(Rustc {
597 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
603 /// Builds the compiler.
605 /// This will build the compiler for a particular stage of the build using
606 /// the `compiler` targeting the `target` architecture. The artifacts
607 /// created will also be linked into the sysroot directory.
608 fn run(self, builder: &Builder<'_>) {
609 let compiler = self.compiler;
610 let target = self.target;
612 // NOTE: the ABI of the beta compiler is different from the ABI of the downloaded compiler,
613 // so its artifacts can't be reused.
614 if builder.download_rustc() && compiler.stage != 0 {
615 // Copy the existing artifacts instead of rebuilding them.
616 // NOTE: this path is only taken for tools linking to rustc-dev.
617 builder.ensure(Sysroot { compiler });
621 builder.ensure(Std::new(compiler, target));
623 if builder.config.keep_stage.contains(&compiler.stage) {
624 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
625 builder.info("Warning: Use `--keep-stage-std` if you want to rebuild the compiler when it changes");
626 builder.ensure(RustcLink::from_rustc(self, compiler));
630 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
631 if compiler_to_use != compiler {
632 builder.ensure(Rustc::new(compiler_to_use, target));
634 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
635 builder.ensure(RustcLink::from_rustc(self, compiler_to_use));
639 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
640 builder.ensure(Std::new(
641 builder.compiler(self.compiler.stage, builder.config.build),
642 builder.config.build,
645 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "build");
646 rustc_cargo(builder, &mut cargo, target);
648 if builder.config.rust_profile_use.is_some()
649 && builder.config.rust_profile_generate.is_some()
651 panic!("Cannot use and generate PGO profiles at the same time");
654 // With LLD, we can use ICF (identical code folding) to reduce the executable size
655 // of librustc_driver/rustc and to improve i-cache utilization.
656 if builder.config.use_lld {
657 cargo.rustflag("-Clink-args=-Wl,--icf=all");
660 let is_collecting = if let Some(path) = &builder.config.rust_profile_generate {
661 if compiler.stage == 1 {
662 cargo.rustflag(&format!("-Cprofile-generate={}", path));
663 // Apparently necessary to avoid overflowing the counters during
664 // a Cargo build profile
665 cargo.rustflag("-Cllvm-args=-vp-counters-per-site=4");
670 } else if let Some(path) = &builder.config.rust_profile_use {
671 if compiler.stage == 1 {
672 cargo.rustflag(&format!("-Cprofile-use={}", path));
673 cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
682 // Ensure paths to Rust sources are relative, not absolute.
683 cargo.rustflag(&format!(
684 "-Cllvm-args=-static-func-strip-dirname-prefix={}",
685 builder.config.src.components().count()
689 builder.info(&format!(
690 "Building stage{} compiler artifacts ({} -> {})",
691 compiler.stage, &compiler.host, target
696 self.crates.to_vec(),
697 &librustc_stamp(builder, compiler, target),
702 builder.ensure(RustcLink::from_rustc(
704 builder.compiler(compiler.stage, builder.config.build),
709 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
712 .arg(builder.rustc_features(builder.kind))
713 .arg("--manifest-path")
714 .arg(builder.src.join("compiler/rustc/Cargo.toml"));
715 rustc_cargo_env(builder, cargo, target);
718 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
719 // Set some configuration variables picked up by build scripts and
720 // the compiler alike
722 .env("CFG_RELEASE", builder.rust_release())
723 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
724 .env("CFG_VERSION", builder.rust_version());
726 if let Some(backend) = builder.config.rust_codegen_backends.get(0) {
727 cargo.env("CFG_DEFAULT_CODEGEN_BACKEND", backend);
730 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
731 let target_config = builder.config.target_config.get(&target);
733 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
735 if let Some(ref ver_date) = builder.rust_info.commit_date() {
736 cargo.env("CFG_VER_DATE", ver_date);
738 if let Some(ref ver_hash) = builder.rust_info.sha() {
739 cargo.env("CFG_VER_HASH", ver_hash);
741 if !builder.unstable_features() {
742 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
745 // Prefer the current target's own default_linker, else a globally
747 if let Some(s) = target_config.and_then(|c| c.default_linker.as_ref()) {
748 cargo.env("CFG_DEFAULT_LINKER", s);
749 } else if let Some(ref s) = builder.config.rustc_default_linker {
750 cargo.env("CFG_DEFAULT_LINKER", s);
753 if builder.config.rustc_parallel {
754 // keep in sync with `bootstrap/lib.rs:Build::rustc_features`
755 // `cfg` option for rustc, `features` option for cargo, for conditional compilation
756 cargo.rustflag("--cfg=parallel_compiler");
757 cargo.rustdocflag("--cfg=parallel_compiler");
759 if builder.config.rust_verify_llvm_ir {
760 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
763 // Pass down configuration from the LLVM build into the build of
764 // rustc_llvm and rustc_codegen_llvm.
766 // Note that this is disabled if LLVM itself is disabled or we're in a check
767 // build. If we are in a check build we still go ahead here presuming we've
768 // detected that LLVM is already built and good to go which helps prevent
769 // busting caches (e.g. like #71152).
770 if builder.config.llvm_enabled()
771 && (builder.kind != Kind::Check
772 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
774 if builder.is_rust_llvm(target) {
775 cargo.env("LLVM_RUSTLLVM", "1");
777 let llvm_config = builder.ensure(native::Llvm { target });
778 cargo.env("LLVM_CONFIG", &llvm_config);
779 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
780 cargo.env("CFG_LLVM_ROOT", s);
783 // Some LLVM linker flags (-L and -l) may be needed to link `rustc_llvm`. Its build script
784 // expects these to be passed via the `LLVM_LINKER_FLAGS` env variable, separated by
788 // - on windows, when `clang-cl` is used with instrumentation, we need to manually add
789 // clang's runtime library resource directory so that the profiler runtime library can be
790 // found. This is to avoid the linker errors about undefined references to
791 // `__llvm_profile_instrument_memop` when linking `rustc_driver`.
792 let mut llvm_linker_flags = String::new();
793 if builder.config.llvm_profile_generate && target.contains("msvc") {
794 if let Some(ref clang_cl_path) = builder.config.llvm_clang_cl {
795 // Add clang's runtime library directory to the search path
796 let clang_rt_dir = get_clang_cl_resource_dir(clang_cl_path);
797 llvm_linker_flags.push_str(&format!("-L{}", clang_rt_dir.display()));
801 // The config can also specify its own llvm linker flags.
802 if let Some(ref s) = builder.config.llvm_ldflags {
803 if !llvm_linker_flags.is_empty() {
804 llvm_linker_flags.push_str(" ");
806 llvm_linker_flags.push_str(s);
809 // Set the linker flags via the env var that `rustc_llvm`'s build script will read.
810 if !llvm_linker_flags.is_empty() {
811 cargo.env("LLVM_LINKER_FLAGS", llvm_linker_flags);
814 // Building with a static libstdc++ is only supported on linux right now,
815 // not for MSVC or macOS
816 if builder.config.llvm_static_stdcpp
817 && !target.contains("freebsd")
818 && !target.contains("msvc")
819 && !target.contains("apple")
820 && !target.contains("solaris")
822 let file = compiler_file(
824 builder.cxx(target).unwrap(),
829 cargo.env("LLVM_STATIC_STDCPP", file);
831 if builder.llvm_link_shared() {
832 cargo.env("LLVM_LINK_SHARED", "1");
834 if builder.config.llvm_use_libcxx {
835 cargo.env("LLVM_USE_LIBCXX", "1");
837 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
838 cargo.env("LLVM_NDEBUG", "1");
843 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
845 pub compiler: Compiler,
846 pub target_compiler: Compiler,
847 pub target: TargetSelection,
848 /// Not actually used; only present to make sure the cache invalidation is correct.
849 crates: Interned<Vec<String>>,
853 fn from_rustc(rustc: Rustc, host_compiler: Compiler) -> Self {
855 compiler: host_compiler,
856 target_compiler: rustc.compiler,
857 target: rustc.target,
858 crates: rustc.crates,
863 impl Step for RustcLink {
866 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
870 /// Same as `std_link`, only for librustc
871 fn run(self, builder: &Builder<'_>) {
872 let compiler = self.compiler;
873 let target_compiler = self.target_compiler;
874 let target = self.target;
875 builder.info(&format!(
876 "Copying stage{} rustc from stage{} ({} -> {} / {})",
877 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
881 &builder.sysroot_libdir(target_compiler, target),
882 &builder.sysroot_libdir(target_compiler, compiler.host),
883 &librustc_stamp(builder, compiler, target),
888 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
889 pub struct CodegenBackend {
890 pub target: TargetSelection,
891 pub compiler: Compiler,
892 pub backend: Interned<String>,
895 impl Step for CodegenBackend {
897 const ONLY_HOSTS: bool = true;
898 // Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
899 const DEFAULT: bool = true;
901 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
902 run.paths(&["compiler/rustc_codegen_cranelift", "compiler/rustc_codegen_gcc"])
905 fn make_run(run: RunConfig<'_>) {
906 for &backend in &run.builder.config.rust_codegen_backends {
907 if backend == "llvm" {
908 continue; // Already built as part of rustc
911 run.builder.ensure(CodegenBackend {
913 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
919 fn run(self, builder: &Builder<'_>) {
920 let compiler = self.compiler;
921 let target = self.target;
922 let backend = self.backend;
924 builder.ensure(Rustc::new(compiler, target));
926 if builder.config.keep_stage.contains(&compiler.stage) {
928 "Warning: Using a potentially old codegen backend. \
929 This may not behave well.",
931 // Codegen backends are linked separately from this step today, so we don't do
936 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
937 if compiler_to_use != compiler {
938 builder.ensure(CodegenBackend { compiler: compiler_to_use, target, backend });
942 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
944 let mut cargo = builder.cargo(compiler, Mode::Codegen, SourceType::InTree, target, "build");
946 .arg("--manifest-path")
947 .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));
948 rustc_cargo_env(builder, &mut cargo, target);
950 let tmp_stamp = out_dir.join(".tmp.stamp");
952 builder.info(&format!(
953 "Building stage{} codegen backend {} ({} -> {})",
954 compiler.stage, backend, &compiler.host, target
956 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false);
957 if builder.config.dry_run {
960 let mut files = files.into_iter().filter(|f| {
961 let filename = f.file_name().unwrap().to_str().unwrap();
962 is_dylib(filename) && filename.contains("rustc_codegen_")
964 let codegen_backend = match files.next() {
966 None => panic!("no dylibs built for codegen backend?"),
968 if let Some(f) = files.next() {
970 "codegen backend built two dylibs:\n{}\n{}",
971 codegen_backend.display(),
975 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
976 let codegen_backend = codegen_backend.to_str().unwrap();
977 t!(fs::write(&stamp, &codegen_backend));
981 /// Creates the `codegen-backends` folder for a compiler that's about to be
982 /// assembled as a complete compiler.
984 /// This will take the codegen artifacts produced by `compiler` and link them
985 /// into an appropriate location for `target_compiler` to be a functional
987 fn copy_codegen_backends_to_sysroot(
988 builder: &Builder<'_>,
990 target_compiler: Compiler,
992 let target = target_compiler.host;
994 // Note that this step is different than all the other `*Link` steps in
995 // that it's not assembling a bunch of libraries but rather is primarily
996 // moving the codegen backend into place. The codegen backend of rustc is
997 // not linked into the main compiler by default but is rather dynamically
998 // selected at runtime for inclusion.
1000 // Here we're looking for the output dylib of the `CodegenBackend` step and
1001 // we're copying that into the `codegen-backends` folder.
1002 let dst = builder.sysroot_codegen_backends(target_compiler);
1003 t!(fs::create_dir_all(&dst), dst);
1005 if builder.config.dry_run {
1009 for backend in builder.config.rust_codegen_backends.iter() {
1010 if backend == "llvm" {
1011 continue; // Already built as part of rustc
1014 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
1015 let dylib = t!(fs::read_to_string(&stamp));
1016 let file = Path::new(&dylib);
1017 let filename = file.file_name().unwrap().to_str().unwrap();
1018 // change `librustc_codegen_cranelift-xxxxxx.so` to
1019 // `librustc_codegen_cranelift-release.so`
1020 let target_filename = {
1021 let dash = filename.find('-').unwrap();
1022 let dot = filename.find('.').unwrap();
1023 format!("{}-{}{}", &filename[..dash], builder.rust_release(), &filename[dot..])
1025 builder.copy(&file, &dst.join(target_filename));
1029 /// Cargo's output path for the standard library in a given stage, compiled
1030 /// by a particular compiler for the specified target.
1031 pub fn libstd_stamp(builder: &Builder<'_>, compiler: Compiler, target: TargetSelection) -> PathBuf {
1032 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
1035 /// Cargo's output path for librustc in a given stage, compiled by a particular
1036 /// compiler for the specified target.
1037 pub fn librustc_stamp(
1038 builder: &Builder<'_>,
1040 target: TargetSelection,
1042 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
1045 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
1046 /// compiler for the specified target and backend.
1047 fn codegen_backend_stamp(
1048 builder: &Builder<'_>,
1050 target: TargetSelection,
1051 backend: Interned<String>,
1054 .cargo_out(compiler, Mode::Codegen, target)
1055 .join(format!(".librustc_codegen_{}.stamp", backend))
1058 pub fn compiler_file(
1059 builder: &Builder<'_>,
1061 target: TargetSelection,
1065 let mut cmd = Command::new(compiler);
1066 cmd.args(builder.cflags(target, GitRepo::Rustc, c));
1067 cmd.arg(format!("-print-file-name={}", file));
1068 let out = output(&mut cmd);
1069 PathBuf::from(out.trim())
1072 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1073 pub struct Sysroot {
1074 pub compiler: Compiler,
1077 impl Step for Sysroot {
1078 type Output = Interned<PathBuf>;
1080 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1084 /// Returns the sysroot for the `compiler` specified that *this build system
1087 /// That is, the sysroot for the stage0 compiler is not what the compiler
1088 /// thinks it is by default, but it's the same as the default for stages
1090 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
1091 let compiler = self.compiler;
1092 let sysroot = if compiler.stage == 0 {
1093 builder.out.join(&compiler.host.triple).join("stage0-sysroot")
1095 builder.out.join(&compiler.host.triple).join(format!("stage{}", compiler.stage))
1097 let _ = fs::remove_dir_all(&sysroot);
1098 t!(fs::create_dir_all(&sysroot));
1100 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
1101 if builder.download_rustc() && compiler.stage != 0 {
1103 builder.config.build, compiler.host,
1104 "Cross-compiling is not yet supported with `download-rustc`",
1106 // Copy the compiler into the correct sysroot.
1108 builder.config.out.join(&*builder.config.build.triple).join("ci-rustc");
1109 builder.cp_r(&ci_rustc_dir, &sysroot);
1110 return INTERNER.intern_path(sysroot);
1113 // Symlink the source root into the same location inside the sysroot,
1114 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
1115 // so that any tools relying on `rust-src` also work for local builds,
1116 // and also for translating the virtual `/rustc/$hash` back to the real
1117 // directory (for running tests with `rust.remap-debuginfo = true`).
1118 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
1119 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
1120 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
1121 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
1123 "warning: creating symbolic link `{}` to `{}` failed with {}",
1124 sysroot_lib_rustlib_src_rust.display(),
1125 builder.src.display(),
1128 if builder.config.rust_remap_debuginfo {
1130 "warning: some `src/test/ui` tests will fail when lacking `{}`",
1131 sysroot_lib_rustlib_src_rust.display(),
1136 INTERNER.intern_path(sysroot)
1140 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
1141 pub struct Assemble {
1142 /// The compiler which we will produce in this step. Assemble itself will
1143 /// take care of ensuring that the necessary prerequisites to do so exist,
1144 /// that is, this target can be a stage2 compiler and Assemble will build
1145 /// previous stages for you.
1146 pub target_compiler: Compiler,
1149 impl Step for Assemble {
1150 type Output = Compiler;
1151 const ONLY_HOSTS: bool = true;
1153 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1154 run.path("compiler/rustc").path("compiler")
1157 fn make_run(run: RunConfig<'_>) {
1158 run.builder.ensure(Assemble {
1159 target_compiler: run.builder.compiler(run.builder.top_stage + 1, run.target),
1163 /// Prepare a new compiler from the artifacts in `stage`
1165 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
1166 /// must have been previously produced by the `stage - 1` builder.build
1168 fn run(self, builder: &Builder<'_>) -> Compiler {
1169 let target_compiler = self.target_compiler;
1171 if target_compiler.stage == 0 {
1173 builder.config.build, target_compiler.host,
1174 "Cannot obtain compiler for non-native build triple at stage 0"
1176 // The stage 0 compiler for the build triple is always pre-built.
1177 return target_compiler;
1180 // Get the compiler that we'll use to bootstrap ourselves.
1182 // Note that this is where the recursive nature of the bootstrap
1183 // happens, as this will request the previous stage's compiler on
1184 // downwards to stage 0.
1186 // Also note that we're building a compiler for the host platform. We
1187 // only assume that we can run `build` artifacts, which means that to
1188 // produce some other architecture compiler we need to start from
1189 // `build` to get there.
1191 // FIXME: It may be faster if we build just a stage 1 compiler and then
1192 // use that to bootstrap this compiler forward.
1193 let build_compiler = builder.compiler(target_compiler.stage - 1, builder.config.build);
1195 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
1196 if builder.download_rustc() {
1197 builder.ensure(Sysroot { compiler: target_compiler });
1198 return target_compiler;
1201 // Build the libraries for this compiler to link to (i.e., the libraries
1202 // it uses at runtime). NOTE: Crates the target compiler compiles don't
1203 // link to these. (FIXME: Is that correct? It seems to be correct most
1204 // of the time but I think we do link to these for stage2/bin compilers
1205 // when not performing a full bootstrap).
1206 builder.ensure(Rustc::new(build_compiler, target_compiler.host));
1208 for &backend in builder.config.rust_codegen_backends.iter() {
1209 if backend == "llvm" {
1210 continue; // Already built as part of rustc
1213 builder.ensure(CodegenBackend {
1214 compiler: build_compiler,
1215 target: target_compiler.host,
1220 let lld_install = if builder.config.lld_enabled {
1221 Some(builder.ensure(native::Lld { target: target_compiler.host }))
1226 let stage = target_compiler.stage;
1227 let host = target_compiler.host;
1228 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
1230 // Link in all dylibs to the libdir
1231 let stamp = librustc_stamp(builder, build_compiler, target_compiler.host);
1232 let proc_macros = builder
1233 .read_stamp_file(&stamp)
1235 .filter_map(|(path, dependency_type)| {
1236 if dependency_type == DependencyType::Host {
1237 Some(path.file_name().unwrap().to_owned().into_string().unwrap())
1242 .collect::<HashSet<_>>();
1244 let sysroot = builder.sysroot(target_compiler);
1245 let rustc_libdir = builder.rustc_libdir(target_compiler);
1246 t!(fs::create_dir_all(&rustc_libdir));
1247 let src_libdir = builder.sysroot_libdir(build_compiler, host);
1248 for f in builder.read_dir(&src_libdir) {
1249 let filename = f.file_name().into_string().unwrap();
1250 if (is_dylib(&filename) || is_debug_info(&filename)) && !proc_macros.contains(&filename)
1252 builder.copy(&f.path(), &rustc_libdir.join(&filename));
1256 copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
1258 // We prepend this bin directory to the user PATH when linking Rust binaries. To
1259 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
1260 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
1261 let libdir_bin = libdir.parent().unwrap().join("bin");
1262 t!(fs::create_dir_all(&libdir_bin));
1263 if let Some(lld_install) = lld_install {
1264 let src_exe = exe("lld", target_compiler.host);
1265 let dst_exe = exe("rust-lld", target_compiler.host);
1266 builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
1267 // for `-Z gcc-ld=lld`
1268 let gcc_ld_dir = libdir_bin.join("gcc-ld");
1269 t!(fs::create_dir(&gcc_ld_dir));
1270 let lld_wrapper_exe = builder.ensure(crate::tool::LldWrapper {
1271 compiler: build_compiler,
1272 target: target_compiler.host,
1274 builder.copy(&lld_wrapper_exe, &gcc_ld_dir.join(exe("ld", target_compiler.host)));
1277 if builder.config.rust_codegen_backends.contains(&INTERNER.intern_str("llvm")) {
1278 let llvm_config_bin = builder.ensure(native::Llvm { target: target_compiler.host });
1279 if !builder.config.dry_run {
1280 let llvm_bin_dir = output(Command::new(llvm_config_bin).arg("--bindir"));
1281 let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
1283 // Since we've already built the LLVM tools, install them to the sysroot.
1284 // This is the equivalent of installing the `llvm-tools-preview` component via
1285 // rustup, and lets developers use a locally built toolchain to
1286 // build projects that expect llvm tools to be present in the sysroot
1287 // (e.g. the `bootimage` crate).
1288 for tool in LLVM_TOOLS {
1289 let tool_exe = exe(tool, target_compiler.host);
1290 let src_path = llvm_bin_dir.join(&tool_exe);
1291 // When using `download-ci-llvm`, some of the tools
1292 // may not exist, so skip trying to copy them.
1293 if src_path.exists() {
1294 builder.copy(&src_path, &libdir_bin.join(&tool_exe));
1300 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
1301 // so that it can be found when the newly built `rustc` is run.
1302 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
1303 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
1305 // Link the compiler binary itself into place
1306 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1307 let rustc = out_dir.join(exe("rustc-main", host));
1308 let bindir = sysroot.join("bin");
1309 t!(fs::create_dir_all(&bindir));
1310 let compiler = builder.rustc(target_compiler);
1311 builder.copy(&rustc, &compiler);
1317 /// Link some files into a rustc sysroot.
1319 /// For a particular stage this will link the file listed in `stamp` into the
1320 /// `sysroot_dst` provided.
1321 pub fn add_to_sysroot(
1322 builder: &Builder<'_>,
1324 sysroot_host_dst: &Path,
1327 let self_contained_dst = &sysroot_dst.join("self-contained");
1328 t!(fs::create_dir_all(&sysroot_dst));
1329 t!(fs::create_dir_all(&sysroot_host_dst));
1330 t!(fs::create_dir_all(&self_contained_dst));
1331 for (path, dependency_type) in builder.read_stamp_file(stamp) {
1332 let dst = match dependency_type {
1333 DependencyType::Host => sysroot_host_dst,
1334 DependencyType::Target => sysroot_dst,
1335 DependencyType::TargetSelfContained => self_contained_dst,
1337 builder.copy(&path, &dst.join(path.file_name().unwrap()));
1342 builder: &Builder<'_>,
1344 tail_args: Vec<String>,
1346 additional_target_deps: Vec<(PathBuf, DependencyType)>,
1349 if builder.config.dry_run {
1353 // `target_root_dir` looks like $dir/$target/release
1354 let target_root_dir = stamp.parent().unwrap();
1355 // `target_deps_dir` looks like $dir/$target/release/deps
1356 let target_deps_dir = target_root_dir.join("deps");
1357 // `host_root_dir` looks like $dir/release
1358 let host_root_dir = target_root_dir
1360 .unwrap() // chop off `release`
1362 .unwrap() // chop off `$target`
1363 .join(target_root_dir.file_name().unwrap());
1365 // Spawn Cargo slurping up its JSON output. We'll start building up the
1366 // `deps` array of all files it generated along with a `toplevel` array of
1367 // files we need to probe for later.
1368 let mut deps = Vec::new();
1369 let mut toplevel = Vec::new();
1370 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1371 let (filenames, crate_types) = match msg {
1372 CargoMessage::CompilerArtifact {
1374 target: CargoTarget { crate_types },
1376 } => (filenames, crate_types),
1379 for filename in filenames {
1380 // Skip files like executables
1381 if !(filename.ends_with(".rlib")
1382 || filename.ends_with(".lib")
1383 || filename.ends_with(".a")
1384 || is_debug_info(&filename)
1385 || is_dylib(&filename)
1386 || (is_check && filename.ends_with(".rmeta")))
1391 let filename = Path::new(&*filename);
1393 // If this was an output file in the "host dir" we don't actually
1394 // worry about it, it's not relevant for us
1395 if filename.starts_with(&host_root_dir) {
1396 // Unless it's a proc macro used in the compiler
1397 if crate_types.iter().any(|t| t == "proc-macro") {
1398 deps.push((filename.to_path_buf(), DependencyType::Host));
1403 // If this was output in the `deps` dir then this is a precise file
1404 // name (hash included) so we start tracking it.
1405 if filename.starts_with(&target_deps_dir) {
1406 deps.push((filename.to_path_buf(), DependencyType::Target));
1410 // Otherwise this was a "top level artifact" which right now doesn't
1411 // have a hash in the name, but there's a version of this file in
1412 // the `deps` folder which *does* have a hash in the name. That's
1413 // the one we'll want to we'll probe for it later.
1415 // We do not use `Path::file_stem` or `Path::extension` here,
1416 // because some generated files may have multiple extensions e.g.
1417 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1418 // split the file name by the last extension (`.lib`) while we need
1419 // to split by all extensions (`.dll.lib`).
1420 let expected_len = t!(filename.metadata()).len();
1421 let filename = filename.file_name().unwrap().to_str().unwrap();
1422 let mut parts = filename.splitn(2, '.');
1423 let file_stem = parts.next().unwrap().to_owned();
1424 let extension = parts.next().unwrap().to_owned();
1426 toplevel.push((file_stem, extension, expected_len));
1431 crate::detail_exit(1);
1434 // Ok now we need to actually find all the files listed in `toplevel`. We've
1435 // got a list of prefix/extensions and we basically just need to find the
1436 // most recent file in the `deps` folder corresponding to each one.
1437 let contents = t!(target_deps_dir.read_dir())
1439 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1440 .collect::<Vec<_>>();
1441 for (prefix, extension, expected_len) in toplevel {
1442 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1443 meta.len() == expected_len
1445 .strip_prefix(&prefix[..])
1446 .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
1449 let max = candidates.max_by_key(|&&(_, _, ref metadata)| {
1450 metadata.modified().expect("mtime should be available on all relevant OSes")
1452 let path_to_add = match max {
1453 Some(triple) => triple.0.to_str().unwrap(),
1454 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1456 if is_dylib(path_to_add) {
1457 let candidate = format!("{}.lib", path_to_add);
1458 let candidate = PathBuf::from(candidate);
1459 if candidate.exists() {
1460 deps.push((candidate, DependencyType::Target));
1463 deps.push((path_to_add.into(), DependencyType::Target));
1466 deps.extend(additional_target_deps);
1468 let mut new_contents = Vec::new();
1469 for (dep, dependency_type) in deps.iter() {
1470 new_contents.extend(match *dependency_type {
1471 DependencyType::Host => b"h",
1472 DependencyType::Target => b"t",
1473 DependencyType::TargetSelfContained => b"s",
1475 new_contents.extend(dep.to_str().unwrap().as_bytes());
1476 new_contents.extend(b"\0");
1478 t!(fs::write(&stamp, &new_contents));
1479 deps.into_iter().map(|(d, _)| d).collect()
1482 pub fn stream_cargo(
1483 builder: &Builder<'_>,
1485 tail_args: Vec<String>,
1486 cb: &mut dyn FnMut(CargoMessage<'_>),
1488 let mut cargo = Command::from(cargo);
1489 if builder.config.dry_run {
1492 // Instruct Cargo to give us json messages on stdout, critically leaving
1493 // stderr as piped so we can get those pretty colors.
1494 let mut message_format = if builder.config.json_output {
1495 String::from("json")
1497 String::from("json-render-diagnostics")
1499 if let Some(s) = &builder.config.rustc_error_format {
1500 message_format.push_str(",json-diagnostic-");
1501 message_format.push_str(s);
1503 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1505 for arg in tail_args {
1509 builder.verbose(&format!("running: {:?}", cargo));
1510 let mut child = match cargo.spawn() {
1512 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1515 // Spawn Cargo slurping up its JSON output. We'll start building up the
1516 // `deps` array of all files it generated along with a `toplevel` array of
1517 // files we need to probe for later.
1518 let stdout = BufReader::new(child.stdout.take().unwrap());
1519 for line in stdout.lines() {
1520 let line = t!(line);
1521 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1523 if builder.config.json_output {
1524 // Forward JSON to stdout.
1525 println!("{}", line);
1529 // If this was informational, just print it out and continue
1530 Err(_) => println!("{}", line),
1534 // Make sure Cargo actually succeeded after we read all of its stdout.
1535 let status = t!(child.wait());
1536 if builder.is_verbose() && !status.success() {
1538 "command did not execute successfully: {:?}\n\
1539 expected success, got: {}",
1546 #[derive(Deserialize)]
1547 pub struct CargoTarget<'a> {
1548 crate_types: Vec<Cow<'a, str>>,
1551 #[derive(Deserialize)]
1552 #[serde(tag = "reason", rename_all = "kebab-case")]
1553 pub enum CargoMessage<'a> {
1555 package_id: Cow<'a, str>,
1556 features: Vec<Cow<'a, str>>,
1557 filenames: Vec<Cow<'a, str>>,
1558 target: CargoTarget<'a>,
1560 BuildScriptExecuted {
1561 package_id: Cow<'a, str>,