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 // Profiler information requires LLVM's compiler-rt
115 if builder.config.profiler {
116 builder.update_submodule(&Path::new("src/llvm-project"));
119 let mut target_deps = builder.ensure(StartupObjects { compiler, target });
121 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
122 if compiler_to_use != compiler {
123 builder.ensure(Std::new(compiler_to_use, target));
124 builder.info(&format!("Uplifting stage1 std ({} -> {})", compiler_to_use.host, target));
126 // Even if we're not building std this stage, the new sysroot must
127 // still contain the third party objects needed by various targets.
128 copy_third_party_objects(builder, &compiler, target);
129 copy_self_contained_objects(builder, &compiler, target);
131 builder.ensure(StdLink::from_std(self, compiler_to_use));
135 target_deps.extend(copy_third_party_objects(builder, &compiler, target));
136 target_deps.extend(copy_self_contained_objects(builder, &compiler, target));
138 let mut cargo = builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "build");
139 std_cargo(builder, target, compiler.stage, &mut cargo);
141 builder.info(&format!(
142 "Building stage{} std artifacts ({} -> {})",
143 compiler.stage, &compiler.host, target
148 self.crates.to_vec(),
149 &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 || target.contains("pc-windows-gnullvm")
210 || builder.config.llvm_libunwind(target) == LlvmLibunwind::InTree
211 && (target.contains("linux") || target.contains("fuchsia"))
214 copy_llvm_libunwind(builder, target, &builder.sysroot_libdir(*compiler, target));
215 target_deps.push((libunwind_path, DependencyType::Target));
221 /// Copies third party objects needed by various targets for self-contained linkage.
222 fn copy_self_contained_objects(
223 builder: &Builder<'_>,
225 target: TargetSelection,
226 ) -> Vec<(PathBuf, DependencyType)> {
227 let libdir_self_contained = builder.sysroot_libdir(*compiler, target).join("self-contained");
228 t!(fs::create_dir_all(&libdir_self_contained));
229 let mut target_deps = vec![];
231 // Copies the libc and CRT objects.
233 // rustc historically provides a more self-contained installation for musl targets
234 // not requiring the presence of a native musl toolchain. For example, it can fall back
235 // to using gcc from a glibc-targeting toolchain for linking.
236 // To do that we have to distribute musl startup objects as a part of Rust toolchain
237 // and link with them manually in the self-contained mode.
238 if target.contains("musl") {
239 let srcdir = builder.musl_libdir(target).unwrap_or_else(|| {
240 panic!("Target {:?} does not have a \"musl-libdir\" key", target.triple)
242 for &obj in &["libc.a", "crt1.o", "Scrt1.o", "rcrt1.o", "crti.o", "crtn.o"] {
245 &libdir_self_contained,
249 DependencyType::TargetSelfContained,
252 let crt_path = builder.ensure(native::CrtBeginEnd { target });
253 for &obj in &["crtbegin.o", "crtbeginS.o", "crtend.o", "crtendS.o"] {
254 let src = crt_path.join(obj);
255 let target = libdir_self_contained.join(obj);
256 builder.copy(&src, &target);
257 target_deps.push((target, DependencyType::TargetSelfContained));
260 if !target.starts_with("s390x") {
261 let libunwind_path = copy_llvm_libunwind(builder, target, &libdir_self_contained);
262 target_deps.push((libunwind_path, DependencyType::TargetSelfContained));
264 } else if target.ends_with("-wasi") {
268 panic!("Target {:?} does not have a \"wasi-root\" key", target.triple)
270 .join("lib/wasm32-wasi");
271 for &obj in &["libc.a", "crt1-command.o", "crt1-reactor.o"] {
274 &libdir_self_contained,
278 DependencyType::TargetSelfContained,
281 } else if target.ends_with("windows-gnu") {
282 for obj in ["crt2.o", "dllcrt2.o"].iter() {
283 let src = compiler_file(builder, builder.cc(target), target, CLang::C, obj);
284 let target = libdir_self_contained.join(obj);
285 builder.copy(&src, &target);
286 target_deps.push((target, DependencyType::TargetSelfContained));
293 /// Configure cargo to compile the standard library, adding appropriate env vars
295 pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, cargo: &mut Cargo) {
296 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
297 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
300 // Determine if we're going to compile in optimized C intrinsics to
301 // the `compiler-builtins` crate. These intrinsics live in LLVM's
302 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
303 // always checked out, so we need to conditionally look for this. (e.g. if
304 // an external LLVM is used we skip the LLVM submodule checkout).
306 // Note that this shouldn't affect the correctness of `compiler-builtins`,
307 // but only its speed. Some intrinsics in C haven't been translated to Rust
308 // yet but that's pretty rare. Other intrinsics have optimized
309 // implementations in C which have only had slower versions ported to Rust,
310 // so we favor the C version where we can, but it's not critical.
312 // If `compiler-rt` is available ensure that the `c` feature of the
313 // `compiler-builtins` crate is enabled and it's configured to learn where
314 // `compiler-rt` is located.
315 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
316 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
317 // Note that `libprofiler_builtins/build.rs` also computes this so if
318 // you're changing something here please also change that.
319 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
320 " compiler-builtins-c"
325 if builder.no_std(target) == Some(true) {
326 let mut features = "compiler-builtins-mem".to_string();
327 if !target.starts_with("bpf") {
328 features.push_str(compiler_builtins_c_feature);
331 // for no-std targets we only compile a few no_std crates
333 .args(&["-p", "alloc"])
334 .arg("--manifest-path")
335 .arg(builder.src.join("library/alloc/Cargo.toml"))
339 let mut features = builder.std_features(target);
340 features.push_str(compiler_builtins_c_feature);
345 .arg("--manifest-path")
346 .arg(builder.src.join("library/test/Cargo.toml"));
348 // Help the libc crate compile by assisting it in finding various
349 // sysroot native libraries.
350 if target.contains("musl") {
351 if let Some(p) = builder.musl_libdir(target) {
352 let root = format!("native={}", p.to_str().unwrap());
353 cargo.rustflag("-L").rustflag(&root);
357 if target.ends_with("-wasi") {
358 if let Some(p) = builder.wasi_root(target) {
359 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
360 cargo.rustflag("-L").rustflag(&root);
365 // By default, rustc uses `-Cembed-bitcode=yes`, and Cargo overrides that
366 // with `-Cembed-bitcode=no` for non-LTO builds. However, libstd must be
367 // built with bitcode so that the produced rlibs can be used for both LTO
368 // builds (which use bitcode) and non-LTO builds (which use object code).
369 // So we override the override here!
371 // But we don't bother for the stage 0 compiler because it's never used
374 cargo.rustflag("-Cembed-bitcode=yes");
377 // By default, rustc does not include unwind tables unless they are required
378 // for a particular target. They are not required by RISC-V targets, but
379 // compiling the standard library with them means that users can get
380 // backtraces without having to recompile the standard library themselves.
382 // This choice was discussed in https://github.com/rust-lang/rust/pull/69890
383 if target.contains("riscv") {
384 cargo.rustflag("-Cforce-unwind-tables=yes");
388 format!("-Zcrate-attr=doc(html_root_url=\"{}/\")", builder.doc_rust_lang_org_channel(),);
389 cargo.rustflag(&html_root);
390 cargo.rustdocflag(&html_root);
393 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
395 pub compiler: Compiler,
396 pub target_compiler: Compiler,
397 pub target: TargetSelection,
398 /// Not actually used; only present to make sure the cache invalidation is correct.
399 crates: Interned<Vec<String>>,
403 fn from_std(std: Std, host_compiler: Compiler) -> Self {
405 compiler: host_compiler,
406 target_compiler: std.compiler,
413 impl Step for StdLink {
416 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
420 /// Link all libstd rlibs/dylibs into the sysroot location.
422 /// Links those artifacts generated by `compiler` to the `stage` compiler's
423 /// sysroot for the specified `host` and `target`.
425 /// Note that this assumes that `compiler` has already generated the libstd
426 /// libraries for `target`, and this method will find them in the relevant
427 /// output directory.
428 fn run(self, builder: &Builder<'_>) {
429 let compiler = self.compiler;
430 let target_compiler = self.target_compiler;
431 let target = self.target;
432 builder.info(&format!(
433 "Copying stage{} std from stage{} ({} -> {} / {})",
434 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
436 let libdir = builder.sysroot_libdir(target_compiler, target);
437 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
438 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
442 /// Copies sanitizer runtime libraries into target libdir.
444 builder: &Builder<'_>,
446 target: TargetSelection,
448 let runtimes: Vec<native::SanitizerRuntime> = builder.ensure(native::Sanitizers { target });
450 if builder.config.dry_run {
454 let mut target_deps = Vec::new();
455 let libdir = builder.sysroot_libdir(*compiler, target);
457 for runtime in &runtimes {
458 let dst = libdir.join(&runtime.name);
459 builder.copy(&runtime.path, &dst);
461 if target == "x86_64-apple-darwin" || target == "aarch64-apple-darwin" {
462 // Update the library’s install name to reflect that it has has been renamed.
463 apple_darwin_update_library_name(&dst, &format!("@rpath/{}", &runtime.name));
464 // Upon renaming the install name, the code signature of the file will invalidate,
465 // so we will sign it again.
466 apple_darwin_sign_file(&dst);
469 target_deps.push(dst);
475 fn apple_darwin_update_library_name(library_path: &Path, new_name: &str) {
476 let status = Command::new("install_name_tool")
481 .expect("failed to execute `install_name_tool`");
482 assert!(status.success());
485 fn apple_darwin_sign_file(file_path: &Path) {
486 let status = Command::new("codesign")
487 .arg("-f") // Force to rewrite the existing signature
492 .expect("failed to execute `codesign`");
493 assert!(status.success());
496 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
497 pub struct StartupObjects {
498 pub compiler: Compiler,
499 pub target: TargetSelection,
502 impl Step for StartupObjects {
503 type Output = Vec<(PathBuf, DependencyType)>;
505 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
506 run.path("library/rtstartup")
509 fn make_run(run: RunConfig<'_>) {
510 run.builder.ensure(StartupObjects {
511 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
516 /// Builds and prepare startup objects like rsbegin.o and rsend.o
518 /// These are primarily used on Windows right now for linking executables/dlls.
519 /// They don't require any library support as they're just plain old object
520 /// files, so we just use the nightly snapshot compiler to always build them (as
521 /// no other compilers are guaranteed to be available).
522 fn run(self, builder: &Builder<'_>) -> Vec<(PathBuf, DependencyType)> {
523 let for_compiler = self.compiler;
524 let target = self.target;
525 if !target.ends_with("windows-gnu") {
529 let mut target_deps = vec![];
531 let src_dir = &builder.src.join("library").join("rtstartup");
532 let dst_dir = &builder.native_dir(target).join("rtstartup");
533 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
534 t!(fs::create_dir_all(dst_dir));
536 for file in &["rsbegin", "rsend"] {
537 let src_file = &src_dir.join(file.to_string() + ".rs");
538 let dst_file = &dst_dir.join(file.to_string() + ".o");
539 if !up_to_date(src_file, dst_file) {
540 let mut cmd = Command::new(&builder.initial_rustc);
541 cmd.env("RUSTC_BOOTSTRAP", "1");
542 if !builder.local_rebuild {
543 // a local_rebuild compiler already has stage1 features
544 cmd.arg("--cfg").arg("bootstrap");
548 .arg(target.rustc_target_arg())
556 let target = sysroot_dir.join((*file).to_string() + ".o");
557 builder.copy(dst_file, &target);
558 target_deps.push((target, DependencyType::Target));
565 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
567 pub target: TargetSelection,
568 pub compiler: Compiler,
569 /// Whether to build a subset of crates, rather than the whole compiler.
571 /// This should only be requested by the user, not used within rustbuild itself.
572 /// Using it within rustbuild can lead to confusing situation where lints are replayed
573 /// in two different steps.
574 crates: Interned<Vec<String>>,
578 pub fn new(compiler: Compiler, target: TargetSelection) -> Self {
579 Self { target, compiler, crates: Default::default() }
583 impl Step for Rustc {
585 const ONLY_HOSTS: bool = true;
586 const DEFAULT: bool = false;
588 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
589 let mut crates = run.builder.in_tree_crates("rustc-main", None);
590 for (i, krate) in crates.iter().enumerate() {
591 if krate.name == "rustc-main" {
592 crates.swap_remove(i);
599 fn make_run(run: RunConfig<'_>) {
600 let crates = build_crates_in_set(&run);
601 run.builder.ensure(Rustc {
602 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
608 /// Builds the compiler.
610 /// This will build the compiler for a particular stage of the build using
611 /// the `compiler` targeting the `target` architecture. The artifacts
612 /// created will also be linked into the sysroot directory.
613 fn run(self, builder: &Builder<'_>) {
614 let compiler = self.compiler;
615 let target = self.target;
617 // NOTE: the ABI of the beta compiler is different from the ABI of the downloaded compiler,
618 // so its artifacts can't be reused.
619 if builder.download_rustc() && compiler.stage != 0 {
620 // Copy the existing artifacts instead of rebuilding them.
621 // NOTE: this path is only taken for tools linking to rustc-dev.
622 builder.ensure(Sysroot { compiler });
626 builder.ensure(Std::new(compiler, target));
628 if builder.config.keep_stage.contains(&compiler.stage) {
629 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
630 builder.info("Warning: Use `--keep-stage-std` if you want to rebuild the compiler when it changes");
631 builder.ensure(RustcLink::from_rustc(self, compiler));
635 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
636 if compiler_to_use != compiler {
637 builder.ensure(Rustc::new(compiler_to_use, target));
639 .info(&format!("Uplifting stage1 rustc ({} -> {})", builder.config.build, target));
640 builder.ensure(RustcLink::from_rustc(self, compiler_to_use));
644 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
645 builder.ensure(Std::new(
646 builder.compiler(self.compiler.stage, builder.config.build),
647 builder.config.build,
650 let mut cargo = builder.cargo(compiler, Mode::Rustc, SourceType::InTree, target, "build");
651 rustc_cargo(builder, &mut cargo, target);
653 if builder.config.rust_profile_use.is_some()
654 && builder.config.rust_profile_generate.is_some()
656 panic!("Cannot use and generate PGO profiles at the same time");
659 // With LLD, we can use ICF (identical code folding) to reduce the executable size
660 // of librustc_driver/rustc and to improve i-cache utilization.
661 if builder.config.use_lld {
662 cargo.rustflag("-Clink-args=-Wl,--icf=all");
665 let is_collecting = if let Some(path) = &builder.config.rust_profile_generate {
666 if compiler.stage == 1 {
667 cargo.rustflag(&format!("-Cprofile-generate={}", path));
668 // Apparently necessary to avoid overflowing the counters during
669 // a Cargo build profile
670 cargo.rustflag("-Cllvm-args=-vp-counters-per-site=4");
675 } else if let Some(path) = &builder.config.rust_profile_use {
676 if compiler.stage == 1 {
677 cargo.rustflag(&format!("-Cprofile-use={}", path));
678 cargo.rustflag("-Cllvm-args=-pgo-warn-missing-function");
687 // Ensure paths to Rust sources are relative, not absolute.
688 cargo.rustflag(&format!(
689 "-Cllvm-args=-static-func-strip-dirname-prefix={}",
690 builder.config.src.components().count()
694 builder.info(&format!(
695 "Building stage{} compiler artifacts ({} -> {})",
696 compiler.stage, &compiler.host, target
701 self.crates.to_vec(),
702 &librustc_stamp(builder, compiler, target),
707 builder.ensure(RustcLink::from_rustc(
709 builder.compiler(compiler.stage, builder.config.build),
714 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
717 .arg(builder.rustc_features(builder.kind))
718 .arg("--manifest-path")
719 .arg(builder.src.join("compiler/rustc/Cargo.toml"));
720 rustc_cargo_env(builder, cargo, target);
723 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo, target: TargetSelection) {
724 // Set some configuration variables picked up by build scripts and
725 // the compiler alike
727 .env("CFG_RELEASE", builder.rust_release())
728 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
729 .env("CFG_VERSION", builder.rust_version());
731 if let Some(backend) = builder.config.rust_codegen_backends.get(0) {
732 cargo.env("CFG_DEFAULT_CODEGEN_BACKEND", backend);
735 let libdir_relative = builder.config.libdir_relative().unwrap_or_else(|| Path::new("lib"));
736 let target_config = builder.config.target_config.get(&target);
738 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
740 if let Some(ref ver_date) = builder.rust_info.commit_date() {
741 cargo.env("CFG_VER_DATE", ver_date);
743 if let Some(ref ver_hash) = builder.rust_info.sha() {
744 cargo.env("CFG_VER_HASH", ver_hash);
746 if !builder.unstable_features() {
747 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
750 // Prefer the current target's own default_linker, else a globally
752 if let Some(s) = target_config.and_then(|c| c.default_linker.as_ref()) {
753 cargo.env("CFG_DEFAULT_LINKER", s);
754 } else if let Some(ref s) = builder.config.rustc_default_linker {
755 cargo.env("CFG_DEFAULT_LINKER", s);
758 if builder.config.rustc_parallel {
759 // keep in sync with `bootstrap/lib.rs:Build::rustc_features`
760 // `cfg` option for rustc, `features` option for cargo, for conditional compilation
761 cargo.rustflag("--cfg=parallel_compiler");
762 cargo.rustdocflag("--cfg=parallel_compiler");
764 if builder.config.rust_verify_llvm_ir {
765 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
768 // Pass down configuration from the LLVM build into the build of
769 // rustc_llvm and rustc_codegen_llvm.
771 // Note that this is disabled if LLVM itself is disabled or we're in a check
772 // build. If we are in a check build we still go ahead here presuming we've
773 // detected that LLVM is already built and good to go which helps prevent
774 // busting caches (e.g. like #71152).
775 if builder.config.llvm_enabled()
776 && (builder.kind != Kind::Check
777 || crate::native::prebuilt_llvm_config(builder, target).is_ok())
779 if builder.is_rust_llvm(target) {
780 cargo.env("LLVM_RUSTLLVM", "1");
782 let llvm_config = builder.ensure(native::Llvm { target });
783 cargo.env("LLVM_CONFIG", &llvm_config);
784 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
785 cargo.env("CFG_LLVM_ROOT", s);
788 // Some LLVM linker flags (-L and -l) may be needed to link `rustc_llvm`. Its build script
789 // expects these to be passed via the `LLVM_LINKER_FLAGS` env variable, separated by
793 // - on windows, when `clang-cl` is used with instrumentation, we need to manually add
794 // clang's runtime library resource directory so that the profiler runtime library can be
795 // found. This is to avoid the linker errors about undefined references to
796 // `__llvm_profile_instrument_memop` when linking `rustc_driver`.
797 let mut llvm_linker_flags = String::new();
798 if builder.config.llvm_profile_generate && target.contains("msvc") {
799 if let Some(ref clang_cl_path) = builder.config.llvm_clang_cl {
800 // Add clang's runtime library directory to the search path
801 let clang_rt_dir = get_clang_cl_resource_dir(clang_cl_path);
802 llvm_linker_flags.push_str(&format!("-L{}", clang_rt_dir.display()));
806 // The config can also specify its own llvm linker flags.
807 if let Some(ref s) = builder.config.llvm_ldflags {
808 if !llvm_linker_flags.is_empty() {
809 llvm_linker_flags.push_str(" ");
811 llvm_linker_flags.push_str(s);
814 // Set the linker flags via the env var that `rustc_llvm`'s build script will read.
815 if !llvm_linker_flags.is_empty() {
816 cargo.env("LLVM_LINKER_FLAGS", llvm_linker_flags);
819 // Building with a static libstdc++ is only supported on linux right now,
820 // not for MSVC or macOS
821 if builder.config.llvm_static_stdcpp
822 && !target.contains("freebsd")
823 && !target.contains("msvc")
824 && !target.contains("apple")
825 && !target.contains("solaris")
827 let file = compiler_file(
829 builder.cxx(target).unwrap(),
834 cargo.env("LLVM_STATIC_STDCPP", file);
836 if builder.llvm_link_shared() {
837 cargo.env("LLVM_LINK_SHARED", "1");
839 if builder.config.llvm_use_libcxx {
840 cargo.env("LLVM_USE_LIBCXX", "1");
842 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
843 cargo.env("LLVM_NDEBUG", "1");
848 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
850 pub compiler: Compiler,
851 pub target_compiler: Compiler,
852 pub target: TargetSelection,
853 /// Not actually used; only present to make sure the cache invalidation is correct.
854 crates: Interned<Vec<String>>,
858 fn from_rustc(rustc: Rustc, host_compiler: Compiler) -> Self {
860 compiler: host_compiler,
861 target_compiler: rustc.compiler,
862 target: rustc.target,
863 crates: rustc.crates,
868 impl Step for RustcLink {
871 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
875 /// Same as `std_link`, only for librustc
876 fn run(self, builder: &Builder<'_>) {
877 let compiler = self.compiler;
878 let target_compiler = self.target_compiler;
879 let target = self.target;
880 builder.info(&format!(
881 "Copying stage{} rustc from stage{} ({} -> {} / {})",
882 target_compiler.stage, compiler.stage, &compiler.host, target_compiler.host, target
886 &builder.sysroot_libdir(target_compiler, target),
887 &builder.sysroot_libdir(target_compiler, compiler.host),
888 &librustc_stamp(builder, compiler, target),
893 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
894 pub struct CodegenBackend {
895 pub target: TargetSelection,
896 pub compiler: Compiler,
897 pub backend: Interned<String>,
900 impl Step for CodegenBackend {
902 const ONLY_HOSTS: bool = true;
903 // Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
904 const DEFAULT: bool = true;
906 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
907 run.paths(&["compiler/rustc_codegen_cranelift", "compiler/rustc_codegen_gcc"])
910 fn make_run(run: RunConfig<'_>) {
911 for &backend in &run.builder.config.rust_codegen_backends {
912 if backend == "llvm" {
913 continue; // Already built as part of rustc
916 run.builder.ensure(CodegenBackend {
918 compiler: run.builder.compiler(run.builder.top_stage, run.build_triple()),
924 fn run(self, builder: &Builder<'_>) {
925 let compiler = self.compiler;
926 let target = self.target;
927 let backend = self.backend;
929 builder.ensure(Rustc::new(compiler, target));
931 if builder.config.keep_stage.contains(&compiler.stage) {
933 "Warning: Using a potentially old codegen backend. \
934 This may not behave well.",
936 // Codegen backends are linked separately from this step today, so we don't do
941 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
942 if compiler_to_use != compiler {
943 builder.ensure(CodegenBackend { compiler: compiler_to_use, target, backend });
947 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
949 let mut cargo = builder.cargo(compiler, Mode::Codegen, SourceType::InTree, target, "build");
951 .arg("--manifest-path")
952 .arg(builder.src.join(format!("compiler/rustc_codegen_{}/Cargo.toml", backend)));
953 rustc_cargo_env(builder, &mut cargo, target);
955 let tmp_stamp = out_dir.join(".tmp.stamp");
957 builder.info(&format!(
958 "Building stage{} codegen backend {} ({} -> {})",
959 compiler.stage, backend, &compiler.host, target
961 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false);
962 if builder.config.dry_run {
965 let mut files = files.into_iter().filter(|f| {
966 let filename = f.file_name().unwrap().to_str().unwrap();
967 is_dylib(filename) && filename.contains("rustc_codegen_")
969 let codegen_backend = match files.next() {
971 None => panic!("no dylibs built for codegen backend?"),
973 if let Some(f) = files.next() {
975 "codegen backend built two dylibs:\n{}\n{}",
976 codegen_backend.display(),
980 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
981 let codegen_backend = codegen_backend.to_str().unwrap();
982 t!(fs::write(&stamp, &codegen_backend));
986 /// Creates the `codegen-backends` folder for a compiler that's about to be
987 /// assembled as a complete compiler.
989 /// This will take the codegen artifacts produced by `compiler` and link them
990 /// into an appropriate location for `target_compiler` to be a functional
992 fn copy_codegen_backends_to_sysroot(
993 builder: &Builder<'_>,
995 target_compiler: Compiler,
997 let target = target_compiler.host;
999 // Note that this step is different than all the other `*Link` steps in
1000 // that it's not assembling a bunch of libraries but rather is primarily
1001 // moving the codegen backend into place. The codegen backend of rustc is
1002 // not linked into the main compiler by default but is rather dynamically
1003 // selected at runtime for inclusion.
1005 // Here we're looking for the output dylib of the `CodegenBackend` step and
1006 // we're copying that into the `codegen-backends` folder.
1007 let dst = builder.sysroot_codegen_backends(target_compiler);
1008 t!(fs::create_dir_all(&dst), dst);
1010 if builder.config.dry_run {
1014 for backend in builder.config.rust_codegen_backends.iter() {
1015 if backend == "llvm" {
1016 continue; // Already built as part of rustc
1019 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
1020 let dylib = t!(fs::read_to_string(&stamp));
1021 let file = Path::new(&dylib);
1022 let filename = file.file_name().unwrap().to_str().unwrap();
1023 // change `librustc_codegen_cranelift-xxxxxx.so` to
1024 // `librustc_codegen_cranelift-release.so`
1025 let target_filename = {
1026 let dash = filename.find('-').unwrap();
1027 let dot = filename.find('.').unwrap();
1028 format!("{}-{}{}", &filename[..dash], builder.rust_release(), &filename[dot..])
1030 builder.copy(&file, &dst.join(target_filename));
1034 /// Cargo's output path for the standard library in a given stage, compiled
1035 /// by a particular compiler for the specified target.
1036 pub fn libstd_stamp(builder: &Builder<'_>, compiler: Compiler, target: TargetSelection) -> PathBuf {
1037 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
1040 /// Cargo's output path for librustc in a given stage, compiled by a particular
1041 /// compiler for the specified target.
1042 pub fn librustc_stamp(
1043 builder: &Builder<'_>,
1045 target: TargetSelection,
1047 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
1050 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
1051 /// compiler for the specified target and backend.
1052 fn codegen_backend_stamp(
1053 builder: &Builder<'_>,
1055 target: TargetSelection,
1056 backend: Interned<String>,
1059 .cargo_out(compiler, Mode::Codegen, target)
1060 .join(format!(".librustc_codegen_{}.stamp", backend))
1063 pub fn compiler_file(
1064 builder: &Builder<'_>,
1066 target: TargetSelection,
1070 let mut cmd = Command::new(compiler);
1071 cmd.args(builder.cflags(target, GitRepo::Rustc, c));
1072 cmd.arg(format!("-print-file-name={}", file));
1073 let out = output(&mut cmd);
1074 PathBuf::from(out.trim())
1077 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
1078 pub struct Sysroot {
1079 pub compiler: Compiler,
1082 impl Step for Sysroot {
1083 type Output = Interned<PathBuf>;
1085 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1089 /// Returns the sysroot for the `compiler` specified that *this build system
1092 /// That is, the sysroot for the stage0 compiler is not what the compiler
1093 /// thinks it is by default, but it's the same as the default for stages
1095 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
1096 let compiler = self.compiler;
1097 let sysroot = if compiler.stage == 0 {
1098 builder.out.join(&compiler.host.triple).join("stage0-sysroot")
1100 builder.out.join(&compiler.host.triple).join(format!("stage{}", compiler.stage))
1102 let _ = fs::remove_dir_all(&sysroot);
1103 t!(fs::create_dir_all(&sysroot));
1105 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
1106 if builder.download_rustc() && compiler.stage != 0 {
1108 builder.config.build, compiler.host,
1109 "Cross-compiling is not yet supported with `download-rustc`",
1111 // Copy the compiler into the correct sysroot.
1113 builder.config.out.join(&*builder.config.build.triple).join("ci-rustc");
1114 builder.cp_r(&ci_rustc_dir, &sysroot);
1115 return INTERNER.intern_path(sysroot);
1118 // Symlink the source root into the same location inside the sysroot,
1119 // where `rust-src` component would go (`$sysroot/lib/rustlib/src/rust`),
1120 // so that any tools relying on `rust-src` also work for local builds,
1121 // and also for translating the virtual `/rustc/$hash` back to the real
1122 // directory (for running tests with `rust.remap-debuginfo = true`).
1123 let sysroot_lib_rustlib_src = sysroot.join("lib/rustlib/src");
1124 t!(fs::create_dir_all(&sysroot_lib_rustlib_src));
1125 let sysroot_lib_rustlib_src_rust = sysroot_lib_rustlib_src.join("rust");
1126 if let Err(e) = symlink_dir(&builder.config, &builder.src, &sysroot_lib_rustlib_src_rust) {
1128 "warning: creating symbolic link `{}` to `{}` failed with {}",
1129 sysroot_lib_rustlib_src_rust.display(),
1130 builder.src.display(),
1133 if builder.config.rust_remap_debuginfo {
1135 "warning: some `src/test/ui` tests will fail when lacking `{}`",
1136 sysroot_lib_rustlib_src_rust.display(),
1141 INTERNER.intern_path(sysroot)
1145 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
1146 pub struct Assemble {
1147 /// The compiler which we will produce in this step. Assemble itself will
1148 /// take care of ensuring that the necessary prerequisites to do so exist,
1149 /// that is, this target can be a stage2 compiler and Assemble will build
1150 /// previous stages for you.
1151 pub target_compiler: Compiler,
1154 impl Step for Assemble {
1155 type Output = Compiler;
1156 const ONLY_HOSTS: bool = true;
1158 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
1159 run.path("compiler/rustc").path("compiler")
1162 fn make_run(run: RunConfig<'_>) {
1163 run.builder.ensure(Assemble {
1164 target_compiler: run.builder.compiler(run.builder.top_stage + 1, run.target),
1168 /// Prepare a new compiler from the artifacts in `stage`
1170 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
1171 /// must have been previously produced by the `stage - 1` builder.build
1173 fn run(self, builder: &Builder<'_>) -> Compiler {
1174 let target_compiler = self.target_compiler;
1176 if target_compiler.stage == 0 {
1178 builder.config.build, target_compiler.host,
1179 "Cannot obtain compiler for non-native build triple at stage 0"
1181 // The stage 0 compiler for the build triple is always pre-built.
1182 return target_compiler;
1185 // Get the compiler that we'll use to bootstrap ourselves.
1187 // Note that this is where the recursive nature of the bootstrap
1188 // happens, as this will request the previous stage's compiler on
1189 // downwards to stage 0.
1191 // Also note that we're building a compiler for the host platform. We
1192 // only assume that we can run `build` artifacts, which means that to
1193 // produce some other architecture compiler we need to start from
1194 // `build` to get there.
1196 // FIXME: It may be faster if we build just a stage 1 compiler and then
1197 // use that to bootstrap this compiler forward.
1198 let build_compiler = builder.compiler(target_compiler.stage - 1, builder.config.build);
1200 // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
1201 if builder.download_rustc() {
1202 builder.ensure(Sysroot { compiler: target_compiler });
1203 return target_compiler;
1206 // Build the libraries for this compiler to link to (i.e., the libraries
1207 // it uses at runtime). NOTE: Crates the target compiler compiles don't
1208 // link to these. (FIXME: Is that correct? It seems to be correct most
1209 // of the time but I think we do link to these for stage2/bin compilers
1210 // when not performing a full bootstrap).
1211 builder.ensure(Rustc::new(build_compiler, target_compiler.host));
1213 for &backend in builder.config.rust_codegen_backends.iter() {
1214 if backend == "llvm" {
1215 continue; // Already built as part of rustc
1218 builder.ensure(CodegenBackend {
1219 compiler: build_compiler,
1220 target: target_compiler.host,
1225 let lld_install = if builder.config.lld_enabled {
1226 Some(builder.ensure(native::Lld { target: target_compiler.host }))
1231 let stage = target_compiler.stage;
1232 let host = target_compiler.host;
1233 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
1235 // Link in all dylibs to the libdir
1236 let stamp = librustc_stamp(builder, build_compiler, target_compiler.host);
1237 let proc_macros = builder
1238 .read_stamp_file(&stamp)
1240 .filter_map(|(path, dependency_type)| {
1241 if dependency_type == DependencyType::Host {
1242 Some(path.file_name().unwrap().to_owned().into_string().unwrap())
1247 .collect::<HashSet<_>>();
1249 let sysroot = builder.sysroot(target_compiler);
1250 let rustc_libdir = builder.rustc_libdir(target_compiler);
1251 t!(fs::create_dir_all(&rustc_libdir));
1252 let src_libdir = builder.sysroot_libdir(build_compiler, host);
1253 for f in builder.read_dir(&src_libdir) {
1254 let filename = f.file_name().into_string().unwrap();
1255 if (is_dylib(&filename) || is_debug_info(&filename)) && !proc_macros.contains(&filename)
1257 builder.copy(&f.path(), &rustc_libdir.join(&filename));
1261 copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
1263 // We prepend this bin directory to the user PATH when linking Rust binaries. To
1264 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
1265 let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
1266 let libdir_bin = libdir.parent().unwrap().join("bin");
1267 t!(fs::create_dir_all(&libdir_bin));
1268 if let Some(lld_install) = lld_install {
1269 let src_exe = exe("lld", target_compiler.host);
1270 let dst_exe = exe("rust-lld", target_compiler.host);
1271 builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
1272 // for `-Z gcc-ld=lld`
1273 let gcc_ld_dir = libdir_bin.join("gcc-ld");
1274 t!(fs::create_dir(&gcc_ld_dir));
1275 let lld_wrapper_exe = builder.ensure(crate::tool::LldWrapper {
1276 compiler: build_compiler,
1277 target: target_compiler.host,
1279 builder.copy(&lld_wrapper_exe, &gcc_ld_dir.join(exe("ld", target_compiler.host)));
1282 if builder.config.rust_codegen_backends.contains(&INTERNER.intern_str("llvm")) {
1283 let llvm_config_bin = builder.ensure(native::Llvm { target: target_compiler.host });
1284 if !builder.config.dry_run {
1285 let llvm_bin_dir = output(Command::new(llvm_config_bin).arg("--bindir"));
1286 let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
1288 // Since we've already built the LLVM tools, install them to the sysroot.
1289 // This is the equivalent of installing the `llvm-tools-preview` component via
1290 // rustup, and lets developers use a locally built toolchain to
1291 // build projects that expect llvm tools to be present in the sysroot
1292 // (e.g. the `bootimage` crate).
1293 for tool in LLVM_TOOLS {
1294 let tool_exe = exe(tool, target_compiler.host);
1295 let src_path = llvm_bin_dir.join(&tool_exe);
1296 // When using `download-ci-llvm`, some of the tools
1297 // may not exist, so skip trying to copy them.
1298 if src_path.exists() {
1299 builder.copy(&src_path, &libdir_bin.join(&tool_exe));
1305 // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
1306 // so that it can be found when the newly built `rustc` is run.
1307 dist::maybe_install_llvm_runtime(builder, target_compiler.host, &sysroot);
1308 dist::maybe_install_llvm_target(builder, target_compiler.host, &sysroot);
1310 // Link the compiler binary itself into place
1311 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
1312 let rustc = out_dir.join(exe("rustc-main", host));
1313 let bindir = sysroot.join("bin");
1314 t!(fs::create_dir_all(&bindir));
1315 let compiler = builder.rustc(target_compiler);
1316 builder.copy(&rustc, &compiler);
1322 /// Link some files into a rustc sysroot.
1324 /// For a particular stage this will link the file listed in `stamp` into the
1325 /// `sysroot_dst` provided.
1326 pub fn add_to_sysroot(
1327 builder: &Builder<'_>,
1329 sysroot_host_dst: &Path,
1332 let self_contained_dst = &sysroot_dst.join("self-contained");
1333 t!(fs::create_dir_all(&sysroot_dst));
1334 t!(fs::create_dir_all(&sysroot_host_dst));
1335 t!(fs::create_dir_all(&self_contained_dst));
1336 for (path, dependency_type) in builder.read_stamp_file(stamp) {
1337 let dst = match dependency_type {
1338 DependencyType::Host => sysroot_host_dst,
1339 DependencyType::Target => sysroot_dst,
1340 DependencyType::TargetSelfContained => self_contained_dst,
1342 builder.copy(&path, &dst.join(path.file_name().unwrap()));
1347 builder: &Builder<'_>,
1349 tail_args: Vec<String>,
1351 additional_target_deps: Vec<(PathBuf, DependencyType)>,
1354 if builder.config.dry_run {
1358 // `target_root_dir` looks like $dir/$target/release
1359 let target_root_dir = stamp.parent().unwrap();
1360 // `target_deps_dir` looks like $dir/$target/release/deps
1361 let target_deps_dir = target_root_dir.join("deps");
1362 // `host_root_dir` looks like $dir/release
1363 let host_root_dir = target_root_dir
1365 .unwrap() // chop off `release`
1367 .unwrap() // chop off `$target`
1368 .join(target_root_dir.file_name().unwrap());
1370 // Spawn Cargo slurping up its JSON output. We'll start building up the
1371 // `deps` array of all files it generated along with a `toplevel` array of
1372 // files we need to probe for later.
1373 let mut deps = Vec::new();
1374 let mut toplevel = Vec::new();
1375 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
1376 let (filenames, crate_types) = match msg {
1377 CargoMessage::CompilerArtifact {
1379 target: CargoTarget { crate_types },
1381 } => (filenames, crate_types),
1384 for filename in filenames {
1385 // Skip files like executables
1386 if !(filename.ends_with(".rlib")
1387 || filename.ends_with(".lib")
1388 || filename.ends_with(".a")
1389 || is_debug_info(&filename)
1390 || is_dylib(&filename)
1391 || (is_check && filename.ends_with(".rmeta")))
1396 let filename = Path::new(&*filename);
1398 // If this was an output file in the "host dir" we don't actually
1399 // worry about it, it's not relevant for us
1400 if filename.starts_with(&host_root_dir) {
1401 // Unless it's a proc macro used in the compiler
1402 if crate_types.iter().any(|t| t == "proc-macro") {
1403 deps.push((filename.to_path_buf(), DependencyType::Host));
1408 // If this was output in the `deps` dir then this is a precise file
1409 // name (hash included) so we start tracking it.
1410 if filename.starts_with(&target_deps_dir) {
1411 deps.push((filename.to_path_buf(), DependencyType::Target));
1415 // Otherwise this was a "top level artifact" which right now doesn't
1416 // have a hash in the name, but there's a version of this file in
1417 // the `deps` folder which *does* have a hash in the name. That's
1418 // the one we'll want to we'll probe for it later.
1420 // We do not use `Path::file_stem` or `Path::extension` here,
1421 // because some generated files may have multiple extensions e.g.
1422 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1423 // split the file name by the last extension (`.lib`) while we need
1424 // to split by all extensions (`.dll.lib`).
1425 let expected_len = t!(filename.metadata()).len();
1426 let filename = filename.file_name().unwrap().to_str().unwrap();
1427 let mut parts = filename.splitn(2, '.');
1428 let file_stem = parts.next().unwrap().to_owned();
1429 let extension = parts.next().unwrap().to_owned();
1431 toplevel.push((file_stem, extension, expected_len));
1436 crate::detail_exit(1);
1439 // Ok now we need to actually find all the files listed in `toplevel`. We've
1440 // got a list of prefix/extensions and we basically just need to find the
1441 // most recent file in the `deps` folder corresponding to each one.
1442 let contents = t!(target_deps_dir.read_dir())
1444 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1445 .collect::<Vec<_>>();
1446 for (prefix, extension, expected_len) in toplevel {
1447 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1448 meta.len() == expected_len
1450 .strip_prefix(&prefix[..])
1451 .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
1454 let max = candidates.max_by_key(|&&(_, _, ref metadata)| {
1455 metadata.modified().expect("mtime should be available on all relevant OSes")
1457 let path_to_add = match max {
1458 Some(triple) => triple.0.to_str().unwrap(),
1459 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1461 if is_dylib(path_to_add) {
1462 let candidate = format!("{}.lib", path_to_add);
1463 let candidate = PathBuf::from(candidate);
1464 if candidate.exists() {
1465 deps.push((candidate, DependencyType::Target));
1468 deps.push((path_to_add.into(), DependencyType::Target));
1471 deps.extend(additional_target_deps);
1473 let mut new_contents = Vec::new();
1474 for (dep, dependency_type) in deps.iter() {
1475 new_contents.extend(match *dependency_type {
1476 DependencyType::Host => b"h",
1477 DependencyType::Target => b"t",
1478 DependencyType::TargetSelfContained => b"s",
1480 new_contents.extend(dep.to_str().unwrap().as_bytes());
1481 new_contents.extend(b"\0");
1483 t!(fs::write(&stamp, &new_contents));
1484 deps.into_iter().map(|(d, _)| d).collect()
1487 pub fn stream_cargo(
1488 builder: &Builder<'_>,
1490 tail_args: Vec<String>,
1491 cb: &mut dyn FnMut(CargoMessage<'_>),
1493 let mut cargo = Command::from(cargo);
1494 if builder.config.dry_run {
1497 // Instruct Cargo to give us json messages on stdout, critically leaving
1498 // stderr as piped so we can get those pretty colors.
1499 let mut message_format = if builder.config.json_output {
1500 String::from("json")
1502 String::from("json-render-diagnostics")
1504 if let Some(s) = &builder.config.rustc_error_format {
1505 message_format.push_str(",json-diagnostic-");
1506 message_format.push_str(s);
1508 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1510 for arg in tail_args {
1514 builder.verbose(&format!("running: {:?}", cargo));
1515 let mut child = match cargo.spawn() {
1517 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1520 // Spawn Cargo slurping up its JSON output. We'll start building up the
1521 // `deps` array of all files it generated along with a `toplevel` array of
1522 // files we need to probe for later.
1523 let stdout = BufReader::new(child.stdout.take().unwrap());
1524 for line in stdout.lines() {
1525 let line = t!(line);
1526 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1528 if builder.config.json_output {
1529 // Forward JSON to stdout.
1530 println!("{}", line);
1534 // If this was informational, just print it out and continue
1535 Err(_) => println!("{}", line),
1539 // Make sure Cargo actually succeeded after we read all of its stdout.
1540 let status = t!(child.wait());
1541 if builder.is_verbose() && !status.success() {
1543 "command did not execute successfully: {:?}\n\
1544 expected success, got: {}",
1551 #[derive(Deserialize)]
1552 pub struct CargoTarget<'a> {
1553 crate_types: Vec<Cow<'a, str>>,
1556 #[derive(Deserialize)]
1557 #[serde(tag = "reason", rename_all = "kebab-case")]
1558 pub enum CargoMessage<'a> {
1560 package_id: Cow<'a, str>,
1561 features: Vec<Cow<'a, str>>,
1562 filenames: Vec<Cow<'a, str>>,
1563 target: CargoTarget<'a>,
1565 BuildScriptExecuted {
1566 package_id: Cow<'a, str>,