1 //! Implementation of compiling various phases of the compiler and standard
4 //! This module contains some of the real meat in the rustbuild build system
5 //! which is where Cargo is used to compiler the standard library, libtest, and
6 //! compiler. This module is also responsible for assembling the sysroot as it
7 //! goes along from the output of the previous stage.
12 use std::io::BufReader;
13 use std::io::prelude::*;
14 use std::path::{Path, PathBuf};
15 use std::process::{Command, Stdio, exit};
18 use build_helper::{output, t, up_to_date};
19 use filetime::FileTime;
20 use serde::Deserialize;
24 use crate::builder::Cargo;
25 use crate::util::{exe, is_dylib};
26 use crate::{Compiler, Mode, GitRepo};
29 use crate::cache::{INTERNER, Interned};
30 use crate::builder::{Step, RunConfig, ShouldRun, Builder};
32 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
34 pub target: Interned<String>,
35 pub compiler: Compiler,
40 const DEFAULT: bool = true;
42 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
43 run.all_krates("test")
46 fn make_run(run: RunConfig<'_>) {
47 run.builder.ensure(Std {
48 compiler: run.builder.compiler(run.builder.top_stage, run.host),
53 /// Builds the standard library.
55 /// This will build the standard library for a particular stage of the build
56 /// using the `compiler` targeting the `target` architecture. The artifacts
57 /// created will also be linked into the sysroot directory.
58 fn run(self, builder: &Builder<'_>) {
59 let target = self.target;
60 let compiler = self.compiler;
62 if builder.config.keep_stage.contains(&compiler.stage) {
63 builder.info("Warning: Using a potentially old libstd. This may not behave well.");
64 builder.ensure(StdLink {
66 target_compiler: compiler,
72 builder.ensure(StartupObjects { compiler, target });
74 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
75 if compiler_to_use != compiler {
77 compiler: compiler_to_use,
80 builder.info(&format!("Uplifting stage1 std ({} -> {})", compiler_to_use.host, target));
82 // Even if we're not building std this stage, the new sysroot must
83 // still contain the third party objects needed by various targets.
84 copy_third_party_objects(builder, &compiler, target);
86 builder.ensure(StdLink {
87 compiler: compiler_to_use,
88 target_compiler: compiler,
94 copy_third_party_objects(builder, &compiler, target);
96 let mut cargo = builder.cargo(compiler, Mode::Std, target, "build");
97 std_cargo(builder, &compiler, target, &mut cargo);
99 builder.info(&format!("Building stage{} std artifacts ({} -> {})", compiler.stage,
100 &compiler.host, target));
104 &libstd_stamp(builder, compiler, target),
107 builder.ensure(StdLink {
108 compiler: builder.compiler(compiler.stage, builder.config.build),
109 target_compiler: compiler,
115 /// Copies third pary objects needed by various targets.
116 fn copy_third_party_objects(builder: &Builder<'_>, compiler: &Compiler, target: Interned<String>) {
117 let libdir = builder.sysroot_libdir(*compiler, target);
119 // Copies the crt(1,i,n).o startup objects
121 // Since musl supports fully static linking, we can cross link for it even
122 // with a glibc-targeting toolchain, given we have the appropriate startup
123 // files. As those shipped with glibc won't work, copy the ones provided by
124 // musl so we have them on linux-gnu hosts.
125 if target.contains("musl") {
126 for &obj in &["crt1.o", "crti.o", "crtn.o"] {
128 &builder.musl_root(target).unwrap().join("lib").join(obj),
132 } else if target.ends_with("-wasi") {
133 for &obj in &["crt1.o"] {
135 &builder.wasi_root(target).unwrap().join("lib/wasm32-wasi").join(obj),
141 // Copies libunwind.a compiled to be linked wit x86_64-fortanix-unknown-sgx.
143 // This target needs to be linked to Fortanix's port of llvm's libunwind.
144 // libunwind requires support for rwlock and printing to stderr,
145 // which is provided by std for this target.
146 if target == "x86_64-fortanix-unknown-sgx" {
147 let src_path_env = "X86_FORTANIX_SGX_LIBS";
148 let obj = "libunwind.a";
149 let src = env::var(src_path_env).expect(&format!("{} not found in env", src_path_env));
150 let src = Path::new(&src).join(obj);
151 builder.copy(&src, &libdir.join(obj));
155 /// Configure cargo to compile the standard library, adding appropriate env vars
157 pub fn std_cargo(builder: &Builder<'_>,
159 target: Interned<String>,
161 if let Some(target) = env::var_os("MACOSX_STD_DEPLOYMENT_TARGET") {
162 cargo.env("MACOSX_DEPLOYMENT_TARGET", target);
165 // Determine if we're going to compile in optimized C intrinsics to
166 // the `compiler-builtins` crate. These intrinsics live in LLVM's
167 // `compiler-rt` repository, but our `src/llvm-project` submodule isn't
168 // always checked out, so we need to conditionally look for this. (e.g. if
169 // an external LLVM is used we skip the LLVM submodule checkout).
171 // Note that this shouldn't affect the correctness of `compiler-builtins`,
172 // but only its speed. Some intrinsics in C haven't been translated to Rust
173 // yet but that's pretty rare. Other intrinsics have optimized
174 // implementations in C which have only had slower versions ported to Rust,
175 // so we favor the C version where we can, but it's not critical.
177 // If `compiler-rt` is available ensure that the `c` feature of the
178 // `compiler-builtins` crate is enabled and it's configured to learn where
179 // `compiler-rt` is located.
180 let compiler_builtins_root = builder.src.join("src/llvm-project/compiler-rt");
181 let compiler_builtins_c_feature = if compiler_builtins_root.exists() {
182 cargo.env("RUST_COMPILER_RT_ROOT", &compiler_builtins_root);
183 " compiler-builtins-c".to_string()
188 if builder.no_std(target) == Some(true) {
189 let mut features = "compiler-builtins-mem".to_string();
190 features.push_str(&compiler_builtins_c_feature);
192 // for no-std targets we only compile a few no_std crates
194 .args(&["-p", "alloc"])
195 .arg("--manifest-path")
196 .arg(builder.src.join("src/liballoc/Cargo.toml"))
198 .arg("compiler-builtins-mem compiler-builtins-c");
200 let mut features = builder.std_features();
201 features.push_str(&compiler_builtins_c_feature);
203 if compiler.stage != 0 && builder.config.sanitizers {
204 // This variable is used by the sanitizer runtime crates, e.g.
205 // rustc_lsan, to build the sanitizer runtime from C code
206 // When this variable is missing, those crates won't compile the C code,
207 // so we don't set this variable during stage0 where llvm-config is
209 // We also only build the runtimes when --enable-sanitizers (or its
210 // config.toml equivalent) is used
211 let llvm_config = builder.ensure(native::Llvm {
212 target: builder.config.build,
215 cargo.env("LLVM_CONFIG", llvm_config);
216 cargo.env("RUSTC_BUILD_SANITIZERS", "1");
219 cargo.arg("--features").arg(features)
220 .arg("--manifest-path")
221 .arg(builder.src.join("src/libtest/Cargo.toml"));
223 if target.contains("musl") {
224 if let Some(p) = builder.musl_root(target) {
225 cargo.env("MUSL_ROOT", p);
229 if target.ends_with("-wasi") {
230 if let Some(p) = builder.wasi_root(target) {
231 cargo.env("WASI_ROOT", p);
237 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
239 pub compiler: Compiler,
240 pub target_compiler: Compiler,
241 pub target: Interned<String>,
244 impl Step for StdLink {
247 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
251 /// Link all libstd rlibs/dylibs into the sysroot location.
253 /// Links those artifacts generated by `compiler` to the `stage` compiler's
254 /// sysroot for the specified `host` and `target`.
256 /// Note that this assumes that `compiler` has already generated the libstd
257 /// libraries for `target`, and this method will find them in the relevant
258 /// output directory.
259 fn run(self, builder: &Builder<'_>) {
260 let compiler = self.compiler;
261 let target_compiler = self.target_compiler;
262 let target = self.target;
263 builder.info(&format!("Copying stage{} std from stage{} ({} -> {} / {})",
264 target_compiler.stage,
267 target_compiler.host,
269 let libdir = builder.sysroot_libdir(target_compiler, target);
270 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
271 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
273 if builder.config.sanitizers && compiler.stage != 0 && target == "x86_64-apple-darwin" {
274 // The sanitizers are only built in stage1 or above, so the dylibs will
275 // be missing in stage0 and causes panic. See the `std()` function above
276 // for reason why the sanitizers are not built in stage0.
277 copy_apple_sanitizer_dylibs(builder, &builder.native_dir(target), "osx", &libdir);
282 fn copy_apple_sanitizer_dylibs(
283 builder: &Builder<'_>,
288 for &sanitizer in &["asan", "tsan"] {
289 let filename = format!("lib__rustc__clang_rt.{}_{}_dynamic.dylib", sanitizer, platform);
290 let mut src_path = native_dir.join(sanitizer);
291 src_path.push("build");
292 src_path.push("lib");
293 src_path.push("darwin");
294 src_path.push(&filename);
295 builder.copy(&src_path, &into.join(filename));
299 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
300 pub struct StartupObjects {
301 pub compiler: Compiler,
302 pub target: Interned<String>,
305 impl Step for StartupObjects {
308 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
309 run.path("src/rtstartup")
312 fn make_run(run: RunConfig<'_>) {
313 run.builder.ensure(StartupObjects {
314 compiler: run.builder.compiler(run.builder.top_stage, run.host),
319 /// Builds and prepare startup objects like rsbegin.o and rsend.o
321 /// These are primarily used on Windows right now for linking executables/dlls.
322 /// They don't require any library support as they're just plain old object
323 /// files, so we just use the nightly snapshot compiler to always build them (as
324 /// no other compilers are guaranteed to be available).
325 fn run(self, builder: &Builder<'_>) {
326 let for_compiler = self.compiler;
327 let target = self.target;
328 if !target.contains("windows-gnu") {
332 let src_dir = &builder.src.join("src/rtstartup");
333 let dst_dir = &builder.native_dir(target).join("rtstartup");
334 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
335 t!(fs::create_dir_all(dst_dir));
337 for file in &["rsbegin", "rsend"] {
338 let src_file = &src_dir.join(file.to_string() + ".rs");
339 let dst_file = &dst_dir.join(file.to_string() + ".o");
340 if !up_to_date(src_file, dst_file) {
341 let mut cmd = Command::new(&builder.initial_rustc);
342 builder.run(cmd.env("RUSTC_BOOTSTRAP", "1")
343 .arg("--cfg").arg("bootstrap")
344 .arg("--target").arg(target)
346 .arg("-o").arg(dst_file)
350 builder.copy(dst_file, &sysroot_dir.join(file.to_string() + ".o"));
353 for obj in ["crt2.o", "dllcrt2.o"].iter() {
354 let src = compiler_file(builder,
358 builder.copy(&src, &sysroot_dir.join(obj));
363 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
365 pub target: Interned<String>,
366 pub compiler: Compiler,
369 impl Step for Rustc {
371 const ONLY_HOSTS: bool = true;
372 const DEFAULT: bool = true;
374 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
375 run.all_krates("rustc-main")
378 fn make_run(run: RunConfig<'_>) {
379 run.builder.ensure(Rustc {
380 compiler: run.builder.compiler(run.builder.top_stage, run.host),
385 /// Builds the compiler.
387 /// This will build the compiler for a particular stage of the build using
388 /// the `compiler` targeting the `target` architecture. The artifacts
389 /// created will also be linked into the sysroot directory.
390 fn run(self, builder: &Builder<'_>) {
391 let compiler = self.compiler;
392 let target = self.target;
394 builder.ensure(Std { compiler, target });
396 if builder.config.keep_stage.contains(&compiler.stage) {
397 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
398 builder.ensure(RustcLink {
400 target_compiler: compiler,
406 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
407 if compiler_to_use != compiler {
408 builder.ensure(Rustc {
409 compiler: compiler_to_use,
412 builder.info(&format!("Uplifting stage1 rustc ({} -> {})",
413 builder.config.build, target));
414 builder.ensure(RustcLink {
415 compiler: compiler_to_use,
416 target_compiler: compiler,
422 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
424 compiler: builder.compiler(self.compiler.stage, builder.config.build),
425 target: builder.config.build,
428 let mut cargo = builder.cargo(compiler, Mode::Rustc, target, "build");
429 rustc_cargo(builder, &mut cargo);
431 builder.info(&format!("Building stage{} compiler artifacts ({} -> {})",
432 compiler.stage, &compiler.host, target));
436 &librustc_stamp(builder, compiler, target),
439 builder.ensure(RustcLink {
440 compiler: builder.compiler(compiler.stage, builder.config.build),
441 target_compiler: compiler,
447 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo) {
448 cargo.arg("--features").arg(builder.rustc_features())
449 .arg("--manifest-path")
450 .arg(builder.src.join("src/rustc/Cargo.toml"));
451 rustc_cargo_env(builder, cargo);
454 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo) {
455 // Set some configuration variables picked up by build scripts and
456 // the compiler alike
457 cargo.env("CFG_RELEASE", builder.rust_release())
458 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
459 .env("CFG_VERSION", builder.rust_version())
460 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default())
461 .env("CFG_CODEGEN_BACKENDS_DIR", &builder.config.rust_codegen_backends_dir);
463 let libdir_relative = builder.config.libdir_relative().unwrap_or(Path::new("lib"));
464 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
466 if let Some(ref ver_date) = builder.rust_info.commit_date() {
467 cargo.env("CFG_VER_DATE", ver_date);
469 if let Some(ref ver_hash) = builder.rust_info.sha() {
470 cargo.env("CFG_VER_HASH", ver_hash);
472 if !builder.unstable_features() {
473 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
475 if let Some(ref s) = builder.config.rustc_default_linker {
476 cargo.env("CFG_DEFAULT_LINKER", s);
478 if builder.config.rustc_parallel {
479 cargo.env("RUSTC_PARALLEL_COMPILER", "1");
481 if builder.config.rust_verify_llvm_ir {
482 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
486 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
488 pub compiler: Compiler,
489 pub target_compiler: Compiler,
490 pub target: Interned<String>,
493 impl Step for RustcLink {
496 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
500 /// Same as `std_link`, only for librustc
501 fn run(self, builder: &Builder<'_>) {
502 let compiler = self.compiler;
503 let target_compiler = self.target_compiler;
504 let target = self.target;
505 builder.info(&format!("Copying stage{} rustc from stage{} ({} -> {} / {})",
506 target_compiler.stage,
509 target_compiler.host,
513 &builder.sysroot_libdir(target_compiler, target),
514 &builder.sysroot_libdir(target_compiler, compiler.host),
515 &librustc_stamp(builder, compiler, target)
520 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
521 pub struct CodegenBackend {
522 pub compiler: Compiler,
523 pub target: Interned<String>,
524 pub backend: Interned<String>,
527 impl Step for CodegenBackend {
529 const ONLY_HOSTS: bool = true;
530 const DEFAULT: bool = true;
532 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
533 run.all_krates("rustc_codegen_llvm")
536 fn make_run(run: RunConfig<'_>) {
537 let backend = run.builder.config.rust_codegen_backends.get(0);
538 let backend = backend.cloned().unwrap_or_else(|| {
539 INTERNER.intern_str("llvm")
541 run.builder.ensure(CodegenBackend {
542 compiler: run.builder.compiler(run.builder.top_stage, run.host),
548 fn run(self, builder: &Builder<'_>) {
549 let compiler = self.compiler;
550 let target = self.target;
551 let backend = self.backend;
553 builder.ensure(Rustc { compiler, target });
555 if builder.config.keep_stage.contains(&compiler.stage) {
556 builder.info("Warning: Using a potentially old codegen backend. \
557 This may not behave well.");
558 // Codegen backends are linked separately from this step today, so we don't do
563 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
564 if compiler_to_use != compiler {
565 builder.ensure(CodegenBackend {
566 compiler: compiler_to_use,
573 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
575 let mut cargo = builder.cargo(compiler, Mode::Codegen, target, "build");
576 cargo.arg("--manifest-path")
577 .arg(builder.src.join("src/librustc_codegen_llvm/Cargo.toml"));
578 rustc_cargo_env(builder, &mut cargo);
580 let features = build_codegen_backend(&builder, &mut cargo, &compiler, target, backend);
581 cargo.arg("--features").arg(features);
583 let tmp_stamp = out_dir.join(".tmp.stamp");
585 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, false);
586 if builder.config.dry_run {
589 let mut files = files.into_iter()
591 let filename = f.file_name().unwrap().to_str().unwrap();
592 is_dylib(filename) && filename.contains("rustc_codegen_llvm-")
594 let codegen_backend = match files.next() {
596 None => panic!("no dylibs built for codegen backend?"),
598 if let Some(f) = files.next() {
599 panic!("codegen backend built two dylibs:\n{}\n{}",
600 codegen_backend.display(),
603 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
604 let codegen_backend = codegen_backend.to_str().unwrap();
605 t!(fs::write(&stamp, &codegen_backend));
609 pub fn build_codegen_backend(builder: &Builder<'_>,
612 target: Interned<String>,
613 backend: Interned<String>) -> String {
614 let mut features = String::new();
617 "llvm" | "emscripten" => {
618 // Build LLVM for our target. This will implicitly build the
619 // host LLVM if necessary.
620 let llvm_config = builder.ensure(native::Llvm {
622 emscripten: backend == "emscripten",
625 if backend == "emscripten" {
626 features.push_str(" emscripten");
629 builder.info(&format!("Building stage{} codegen artifacts ({} -> {}, {})",
630 compiler.stage, &compiler.host, target, backend));
632 // Pass down configuration from the LLVM build into the build of
633 // librustc_llvm and librustc_codegen_llvm.
634 if builder.is_rust_llvm(target) && backend != "emscripten" {
635 cargo.env("LLVM_RUSTLLVM", "1");
638 cargo.env("LLVM_CONFIG", &llvm_config);
639 if backend != "emscripten" {
640 let target_config = builder.config.target_config.get(&target);
641 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
642 cargo.env("CFG_LLVM_ROOT", s);
645 // Some LLVM linker flags (-L and -l) may be needed to link librustc_llvm.
646 if let Some(ref s) = builder.config.llvm_ldflags {
647 cargo.env("LLVM_LINKER_FLAGS", s);
649 // Building with a static libstdc++ is only supported on linux right now,
650 // not for MSVC or macOS
651 if builder.config.llvm_static_stdcpp &&
652 !target.contains("freebsd") &&
653 !target.contains("windows") &&
654 !target.contains("apple") {
655 let file = compiler_file(builder,
656 builder.cxx(target).unwrap(),
659 cargo.env("LLVM_STATIC_STDCPP", file);
661 if builder.config.llvm_link_shared ||
662 (builder.config.llvm_thin_lto && backend != "emscripten")
664 cargo.env("LLVM_LINK_SHARED", "1");
666 if builder.config.llvm_use_libcxx {
667 cargo.env("LLVM_USE_LIBCXX", "1");
669 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
670 cargo.env("LLVM_NDEBUG", "1");
673 _ => panic!("unknown backend: {}", backend),
679 /// Creates the `codegen-backends` folder for a compiler that's about to be
680 /// assembled as a complete compiler.
682 /// This will take the codegen artifacts produced by `compiler` and link them
683 /// into an appropriate location for `target_compiler` to be a functional
685 fn copy_codegen_backends_to_sysroot(builder: &Builder<'_>,
687 target_compiler: Compiler) {
688 let target = target_compiler.host;
690 // Note that this step is different than all the other `*Link` steps in
691 // that it's not assembling a bunch of libraries but rather is primarily
692 // moving the codegen backend into place. The codegen backend of rustc is
693 // not linked into the main compiler by default but is rather dynamically
694 // selected at runtime for inclusion.
696 // Here we're looking for the output dylib of the `CodegenBackend` step and
697 // we're copying that into the `codegen-backends` folder.
698 let dst = builder.sysroot_codegen_backends(target_compiler);
699 t!(fs::create_dir_all(&dst));
701 if builder.config.dry_run {
705 for backend in builder.config.rust_codegen_backends.iter() {
706 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
707 let dylib = t!(fs::read_to_string(&stamp));
708 let file = Path::new(&dylib);
709 let filename = file.file_name().unwrap().to_str().unwrap();
710 // change `librustc_codegen_llvm-xxxxxx.so` to `librustc_codegen_llvm-llvm.so`
711 let target_filename = {
712 let dash = filename.find('-').unwrap();
713 let dot = filename.find('.').unwrap();
719 builder.copy(&file, &dst.join(target_filename));
723 fn copy_lld_to_sysroot(builder: &Builder<'_>,
724 target_compiler: Compiler,
725 lld_install_root: &Path) {
726 let target = target_compiler.host;
728 let dst = builder.sysroot_libdir(target_compiler, target)
732 t!(fs::create_dir_all(&dst));
734 let src_exe = exe("lld", &target);
735 let dst_exe = exe("rust-lld", &target);
736 // we prepend this bin directory to the user PATH when linking Rust binaries. To
737 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
738 builder.copy(&lld_install_root.join("bin").join(&src_exe), &dst.join(&dst_exe));
741 /// Cargo's output path for the standard library in a given stage, compiled
742 /// by a particular compiler for the specified target.
744 builder: &Builder<'_>,
746 target: Interned<String>,
748 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
751 /// Cargo's output path for librustc in a given stage, compiled by a particular
752 /// compiler for the specified target.
753 pub fn librustc_stamp(
754 builder: &Builder<'_>,
756 target: Interned<String>,
758 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
761 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
762 /// compiler for the specified target and backend.
763 fn codegen_backend_stamp(builder: &Builder<'_>,
765 target: Interned<String>,
766 backend: Interned<String>) -> PathBuf {
767 builder.cargo_out(compiler, Mode::Codegen, target)
768 .join(format!(".librustc_codegen_llvm-{}.stamp", backend))
771 pub fn compiler_file(
772 builder: &Builder<'_>,
774 target: Interned<String>,
777 let mut cmd = Command::new(compiler);
778 cmd.args(builder.cflags(target, GitRepo::Rustc));
779 cmd.arg(format!("-print-file-name={}", file));
780 let out = output(&mut cmd);
781 PathBuf::from(out.trim())
784 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
786 pub compiler: Compiler,
789 impl Step for Sysroot {
790 type Output = Interned<PathBuf>;
792 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
796 /// Returns the sysroot for the `compiler` specified that *this build system
799 /// That is, the sysroot for the stage0 compiler is not what the compiler
800 /// thinks it is by default, but it's the same as the default for stages
802 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
803 let compiler = self.compiler;
804 let sysroot = if compiler.stage == 0 {
805 builder.out.join(&compiler.host).join("stage0-sysroot")
807 builder.out.join(&compiler.host).join(format!("stage{}", compiler.stage))
809 let _ = fs::remove_dir_all(&sysroot);
810 t!(fs::create_dir_all(&sysroot));
811 INTERNER.intern_path(sysroot)
815 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
816 pub struct Assemble {
817 /// The compiler which we will produce in this step. Assemble itself will
818 /// take care of ensuring that the necessary prerequisites to do so exist,
819 /// that is, this target can be a stage2 compiler and Assemble will build
820 /// previous stages for you.
821 pub target_compiler: Compiler,
824 impl Step for Assemble {
825 type Output = Compiler;
827 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
831 /// Prepare a new compiler from the artifacts in `stage`
833 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
834 /// must have been previously produced by the `stage - 1` builder.build
836 fn run(self, builder: &Builder<'_>) -> Compiler {
837 let target_compiler = self.target_compiler;
839 if target_compiler.stage == 0 {
840 assert_eq!(builder.config.build, target_compiler.host,
841 "Cannot obtain compiler for non-native build triple at stage 0");
842 // The stage 0 compiler for the build triple is always pre-built.
843 return target_compiler;
846 // Get the compiler that we'll use to bootstrap ourselves.
848 // Note that this is where the recursive nature of the bootstrap
849 // happens, as this will request the previous stage's compiler on
850 // downwards to stage 0.
852 // Also note that we're building a compiler for the host platform. We
853 // only assume that we can run `build` artifacts, which means that to
854 // produce some other architecture compiler we need to start from
855 // `build` to get there.
857 // FIXME: Perhaps we should download those libraries?
858 // It would make builds faster...
860 // FIXME: It may be faster if we build just a stage 1 compiler and then
861 // use that to bootstrap this compiler forward.
863 builder.compiler(target_compiler.stage - 1, builder.config.build);
865 // Build the libraries for this compiler to link to (i.e., the libraries
866 // it uses at runtime). NOTE: Crates the target compiler compiles don't
867 // link to these. (FIXME: Is that correct? It seems to be correct most
868 // of the time but I think we do link to these for stage2/bin compilers
869 // when not performing a full bootstrap).
870 builder.ensure(Rustc {
871 compiler: build_compiler,
872 target: target_compiler.host,
874 for &backend in builder.config.rust_codegen_backends.iter() {
875 builder.ensure(CodegenBackend {
876 compiler: build_compiler,
877 target: target_compiler.host,
882 let lld_install = if builder.config.lld_enabled {
883 Some(builder.ensure(native::Lld {
884 target: target_compiler.host,
890 let stage = target_compiler.stage;
891 let host = target_compiler.host;
892 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
894 // Link in all dylibs to the libdir
895 let sysroot = builder.sysroot(target_compiler);
896 let rustc_libdir = builder.rustc_libdir(target_compiler);
897 t!(fs::create_dir_all(&rustc_libdir));
898 let src_libdir = builder.sysroot_libdir(build_compiler, host);
899 for f in builder.read_dir(&src_libdir) {
900 let filename = f.file_name().into_string().unwrap();
901 if is_dylib(&filename) {
902 builder.copy(&f.path(), &rustc_libdir.join(&filename));
906 copy_codegen_backends_to_sysroot(builder,
909 if let Some(lld_install) = lld_install {
910 copy_lld_to_sysroot(builder, target_compiler, &lld_install);
913 dist::maybe_install_llvm_dylib(builder, target_compiler.host, &sysroot);
915 // Link the compiler binary itself into place
916 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
917 let rustc = out_dir.join(exe("rustc_binary", &*host));
918 let bindir = sysroot.join("bin");
919 t!(fs::create_dir_all(&bindir));
920 let compiler = builder.rustc(target_compiler);
921 let _ = fs::remove_file(&compiler);
922 builder.copy(&rustc, &compiler);
928 /// Link some files into a rustc sysroot.
930 /// For a particular stage this will link the file listed in `stamp` into the
931 /// `sysroot_dst` provided.
932 pub fn add_to_sysroot(
933 builder: &Builder<'_>,
935 sysroot_host_dst: &Path,
938 t!(fs::create_dir_all(&sysroot_dst));
939 t!(fs::create_dir_all(&sysroot_host_dst));
940 for (path, host) in builder.read_stamp_file(stamp) {
942 builder.copy(&path, &sysroot_host_dst.join(path.file_name().unwrap()));
944 builder.copy(&path, &sysroot_dst.join(path.file_name().unwrap()));
949 pub fn run_cargo(builder: &Builder<'_>,
951 tail_args: Vec<String>,
956 if builder.config.dry_run {
960 // `target_root_dir` looks like $dir/$target/release
961 let target_root_dir = stamp.parent().unwrap();
962 // `target_deps_dir` looks like $dir/$target/release/deps
963 let target_deps_dir = target_root_dir.join("deps");
964 // `host_root_dir` looks like $dir/release
965 let host_root_dir = target_root_dir.parent().unwrap() // chop off `release`
966 .parent().unwrap() // chop off `$target`
967 .join(target_root_dir.file_name().unwrap());
969 // Spawn Cargo slurping up its JSON output. We'll start building up the
970 // `deps` array of all files it generated along with a `toplevel` array of
971 // files we need to probe for later.
972 let mut deps = Vec::new();
973 let mut toplevel = Vec::new();
974 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
975 let (filenames, crate_types) = match msg {
976 CargoMessage::CompilerArtifact {
978 target: CargoTarget {
982 } => (filenames, crate_types),
985 for filename in filenames {
986 // Skip files like executables
987 if !filename.ends_with(".rlib") &&
988 !filename.ends_with(".lib") &&
989 !filename.ends_with(".a") &&
990 !is_dylib(&filename) &&
991 !(is_check && filename.ends_with(".rmeta")) {
995 let filename = Path::new(&*filename);
997 // If this was an output file in the "host dir" we don't actually
998 // worry about it, it's not relevant for us
999 if filename.starts_with(&host_root_dir) {
1000 // Unless it's a proc macro used in the compiler
1001 if crate_types.iter().any(|t| t == "proc-macro") {
1002 deps.push((filename.to_path_buf(), true));
1007 // If this was output in the `deps` dir then this is a precise file
1008 // name (hash included) so we start tracking it.
1009 if filename.starts_with(&target_deps_dir) {
1010 deps.push((filename.to_path_buf(), false));
1014 // Otherwise this was a "top level artifact" which right now doesn't
1015 // have a hash in the name, but there's a version of this file in
1016 // the `deps` folder which *does* have a hash in the name. That's
1017 // the one we'll want to we'll probe for it later.
1019 // We do not use `Path::file_stem` or `Path::extension` here,
1020 // because some generated files may have multiple extensions e.g.
1021 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1022 // split the file name by the last extension (`.lib`) while we need
1023 // to split by all extensions (`.dll.lib`).
1024 let expected_len = t!(filename.metadata()).len();
1025 let filename = filename.file_name().unwrap().to_str().unwrap();
1026 let mut parts = filename.splitn(2, '.');
1027 let file_stem = parts.next().unwrap().to_owned();
1028 let extension = parts.next().unwrap().to_owned();
1030 toplevel.push((file_stem, extension, expected_len));
1038 // Ok now we need to actually find all the files listed in `toplevel`. We've
1039 // got a list of prefix/extensions and we basically just need to find the
1040 // most recent file in the `deps` folder corresponding to each one.
1041 let contents = t!(target_deps_dir.read_dir())
1043 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1044 .collect::<Vec<_>>();
1045 for (prefix, extension, expected_len) in toplevel {
1046 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1047 filename.starts_with(&prefix[..]) &&
1048 filename[prefix.len()..].starts_with("-") &&
1049 filename.ends_with(&extension[..]) &&
1050 meta.len() == expected_len
1052 let max = candidates.max_by_key(|&&(_, _, ref metadata)| {
1053 FileTime::from_last_modification_time(metadata)
1055 let path_to_add = match max {
1056 Some(triple) => triple.0.to_str().unwrap(),
1057 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1059 if is_dylib(path_to_add) {
1060 let candidate = format!("{}.lib", path_to_add);
1061 let candidate = PathBuf::from(candidate);
1062 if candidate.exists() {
1063 deps.push((candidate, false));
1066 deps.push((path_to_add.into(), false));
1070 let mut new_contents = Vec::new();
1071 for (dep, proc_macro) in deps.iter() {
1072 new_contents.extend(if *proc_macro { b"h" } else { b"t" });
1073 new_contents.extend(dep.to_str().unwrap().as_bytes());
1074 new_contents.extend(b"\0");
1076 t!(fs::write(&stamp, &new_contents));
1077 deps.into_iter().map(|(d, _)| d).collect()
1080 pub fn stream_cargo(
1081 builder: &Builder<'_>,
1083 tail_args: Vec<String>,
1084 cb: &mut dyn FnMut(CargoMessage<'_>),
1086 let mut cargo = Command::from(cargo);
1087 if builder.config.dry_run {
1090 // Instruct Cargo to give us json messages on stdout, critically leaving
1091 // stderr as piped so we can get those pretty colors.
1092 let mut message_format = String::from("json-render-diagnostics");
1093 if let Some(s) = &builder.config.rustc_error_format {
1094 message_format.push_str(",json-diagnostic-");
1095 message_format.push_str(s);
1097 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1099 for arg in tail_args {
1103 builder.verbose(&format!("running: {:?}", cargo));
1104 let mut child = match cargo.spawn() {
1106 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1109 // Spawn Cargo slurping up its JSON output. We'll start building up the
1110 // `deps` array of all files it generated along with a `toplevel` array of
1111 // files we need to probe for later.
1112 let stdout = BufReader::new(child.stdout.take().unwrap());
1113 for line in stdout.lines() {
1114 let line = t!(line);
1115 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1117 // If this was informational, just print it out and continue
1118 Err(_) => println!("{}", line)
1122 // Make sure Cargo actually succeeded after we read all of its stdout.
1123 let status = t!(child.wait());
1124 if !status.success() {
1125 eprintln!("command did not execute successfully: {:?}\n\
1126 expected success, got: {}",
1133 #[derive(Deserialize)]
1134 pub struct CargoTarget<'a> {
1135 crate_types: Vec<Cow<'a, str>>,
1138 #[derive(Deserialize)]
1139 #[serde(tag = "reason", rename_all = "kebab-case")]
1140 pub enum CargoMessage<'a> {
1142 package_id: Cow<'a, str>,
1143 features: Vec<Cow<'a, str>>,
1144 filenames: Vec<Cow<'a, str>>,
1145 target: CargoTarget<'a>,
1147 BuildScriptExecuted {
1148 package_id: Cow<'a, str>,