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 // Help the libc crate compile by assisting it in finding various
224 // sysroot native libraries.
225 if target.contains("musl") {
226 if let Some(p) = builder.musl_root(target) {
227 let root = format!("native={}/lib", p.to_str().unwrap());
228 cargo.rustflag("-L").rustflag(&root);
232 if target.ends_with("-wasi") {
233 if let Some(p) = builder.wasi_root(target) {
234 let root = format!("native={}/lib/wasm32-wasi", p.to_str().unwrap());
235 cargo.rustflag("-L").rustflag(&root);
241 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
243 pub compiler: Compiler,
244 pub target_compiler: Compiler,
245 pub target: Interned<String>,
248 impl Step for StdLink {
251 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
255 /// Link all libstd rlibs/dylibs into the sysroot location.
257 /// Links those artifacts generated by `compiler` to the `stage` compiler's
258 /// sysroot for the specified `host` and `target`.
260 /// Note that this assumes that `compiler` has already generated the libstd
261 /// libraries for `target`, and this method will find them in the relevant
262 /// output directory.
263 fn run(self, builder: &Builder<'_>) {
264 let compiler = self.compiler;
265 let target_compiler = self.target_compiler;
266 let target = self.target;
267 builder.info(&format!("Copying stage{} std from stage{} ({} -> {} / {})",
268 target_compiler.stage,
271 target_compiler.host,
273 let libdir = builder.sysroot_libdir(target_compiler, target);
274 let hostdir = builder.sysroot_libdir(target_compiler, compiler.host);
275 add_to_sysroot(builder, &libdir, &hostdir, &libstd_stamp(builder, compiler, target));
277 if builder.config.sanitizers && compiler.stage != 0 && target == "x86_64-apple-darwin" {
278 // The sanitizers are only built in stage1 or above, so the dylibs will
279 // be missing in stage0 and causes panic. See the `std()` function above
280 // for reason why the sanitizers are not built in stage0.
281 copy_apple_sanitizer_dylibs(builder, &builder.native_dir(target), "osx", &libdir);
286 fn copy_apple_sanitizer_dylibs(
287 builder: &Builder<'_>,
292 for &sanitizer in &["asan", "tsan"] {
293 let filename = format!("lib__rustc__clang_rt.{}_{}_dynamic.dylib", sanitizer, platform);
294 let mut src_path = native_dir.join(sanitizer);
295 src_path.push("build");
296 src_path.push("lib");
297 src_path.push("darwin");
298 src_path.push(&filename);
299 builder.copy(&src_path, &into.join(filename));
303 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
304 pub struct StartupObjects {
305 pub compiler: Compiler,
306 pub target: Interned<String>,
309 impl Step for StartupObjects {
312 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
313 run.path("src/rtstartup")
316 fn make_run(run: RunConfig<'_>) {
317 run.builder.ensure(StartupObjects {
318 compiler: run.builder.compiler(run.builder.top_stage, run.host),
323 /// Builds and prepare startup objects like rsbegin.o and rsend.o
325 /// These are primarily used on Windows right now for linking executables/dlls.
326 /// They don't require any library support as they're just plain old object
327 /// files, so we just use the nightly snapshot compiler to always build them (as
328 /// no other compilers are guaranteed to be available).
329 fn run(self, builder: &Builder<'_>) {
330 let for_compiler = self.compiler;
331 let target = self.target;
332 if !target.contains("windows-gnu") {
336 let src_dir = &builder.src.join("src/rtstartup");
337 let dst_dir = &builder.native_dir(target).join("rtstartup");
338 let sysroot_dir = &builder.sysroot_libdir(for_compiler, target);
339 t!(fs::create_dir_all(dst_dir));
341 for file in &["rsbegin", "rsend"] {
342 let src_file = &src_dir.join(file.to_string() + ".rs");
343 let dst_file = &dst_dir.join(file.to_string() + ".o");
344 if !up_to_date(src_file, dst_file) {
345 let mut cmd = Command::new(&builder.initial_rustc);
346 builder.run(cmd.env("RUSTC_BOOTSTRAP", "1")
347 .arg("--cfg").arg("bootstrap")
348 .arg("--target").arg(target)
350 .arg("-o").arg(dst_file)
354 builder.copy(dst_file, &sysroot_dir.join(file.to_string() + ".o"));
357 for obj in ["crt2.o", "dllcrt2.o"].iter() {
358 let src = compiler_file(builder,
362 builder.copy(&src, &sysroot_dir.join(obj));
367 #[derive(Debug, PartialOrd, Ord, Copy, Clone, PartialEq, Eq, Hash)]
369 pub target: Interned<String>,
370 pub compiler: Compiler,
373 impl Step for Rustc {
375 const ONLY_HOSTS: bool = true;
376 const DEFAULT: bool = true;
378 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
379 run.all_krates("rustc-main")
382 fn make_run(run: RunConfig<'_>) {
383 run.builder.ensure(Rustc {
384 compiler: run.builder.compiler(run.builder.top_stage, run.host),
389 /// Builds the compiler.
391 /// This will build the compiler for a particular stage of the build using
392 /// the `compiler` targeting the `target` architecture. The artifacts
393 /// created will also be linked into the sysroot directory.
394 fn run(self, builder: &Builder<'_>) {
395 let compiler = self.compiler;
396 let target = self.target;
398 builder.ensure(Std { compiler, target });
400 if builder.config.keep_stage.contains(&compiler.stage) {
401 builder.info("Warning: Using a potentially old librustc. This may not behave well.");
402 builder.ensure(RustcLink {
404 target_compiler: compiler,
410 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
411 if compiler_to_use != compiler {
412 builder.ensure(Rustc {
413 compiler: compiler_to_use,
416 builder.info(&format!("Uplifting stage1 rustc ({} -> {})",
417 builder.config.build, target));
418 builder.ensure(RustcLink {
419 compiler: compiler_to_use,
420 target_compiler: compiler,
426 // Ensure that build scripts and proc macros have a std / libproc_macro to link against.
428 compiler: builder.compiler(self.compiler.stage, builder.config.build),
429 target: builder.config.build,
432 let mut cargo = builder.cargo(compiler, Mode::Rustc, target, "build");
433 rustc_cargo(builder, &mut cargo);
435 builder.info(&format!("Building stage{} compiler artifacts ({} -> {})",
436 compiler.stage, &compiler.host, target));
440 &librustc_stamp(builder, compiler, target),
443 builder.ensure(RustcLink {
444 compiler: builder.compiler(compiler.stage, builder.config.build),
445 target_compiler: compiler,
451 pub fn rustc_cargo(builder: &Builder<'_>, cargo: &mut Cargo) {
452 cargo.arg("--features").arg(builder.rustc_features())
453 .arg("--manifest-path")
454 .arg(builder.src.join("src/rustc/Cargo.toml"));
455 rustc_cargo_env(builder, cargo);
458 pub fn rustc_cargo_env(builder: &Builder<'_>, cargo: &mut Cargo) {
459 // Set some configuration variables picked up by build scripts and
460 // the compiler alike
461 cargo.env("CFG_RELEASE", builder.rust_release())
462 .env("CFG_RELEASE_CHANNEL", &builder.config.channel)
463 .env("CFG_VERSION", builder.rust_version())
464 .env("CFG_PREFIX", builder.config.prefix.clone().unwrap_or_default())
465 .env("CFG_CODEGEN_BACKENDS_DIR", &builder.config.rust_codegen_backends_dir);
467 let libdir_relative = builder.config.libdir_relative().unwrap_or(Path::new("lib"));
468 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
470 if let Some(ref ver_date) = builder.rust_info.commit_date() {
471 cargo.env("CFG_VER_DATE", ver_date);
473 if let Some(ref ver_hash) = builder.rust_info.sha() {
474 cargo.env("CFG_VER_HASH", ver_hash);
476 if !builder.unstable_features() {
477 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
479 if let Some(ref s) = builder.config.rustc_default_linker {
480 cargo.env("CFG_DEFAULT_LINKER", s);
482 if builder.config.rustc_parallel {
483 cargo.rustflag("--cfg=parallel_compiler");
485 if builder.config.rust_verify_llvm_ir {
486 cargo.env("RUSTC_VERIFY_LLVM_IR", "1");
490 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
492 pub compiler: Compiler,
493 pub target_compiler: Compiler,
494 pub target: Interned<String>,
497 impl Step for RustcLink {
500 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
504 /// Same as `std_link`, only for librustc
505 fn run(self, builder: &Builder<'_>) {
506 let compiler = self.compiler;
507 let target_compiler = self.target_compiler;
508 let target = self.target;
509 builder.info(&format!("Copying stage{} rustc from stage{} ({} -> {} / {})",
510 target_compiler.stage,
513 target_compiler.host,
517 &builder.sysroot_libdir(target_compiler, target),
518 &builder.sysroot_libdir(target_compiler, compiler.host),
519 &librustc_stamp(builder, compiler, target)
524 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
525 pub struct CodegenBackend {
526 pub compiler: Compiler,
527 pub target: Interned<String>,
528 pub backend: Interned<String>,
531 impl Step for CodegenBackend {
533 const ONLY_HOSTS: bool = true;
534 const DEFAULT: bool = true;
536 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
537 run.all_krates("rustc_codegen_llvm")
540 fn make_run(run: RunConfig<'_>) {
541 let backend = run.builder.config.rust_codegen_backends.get(0);
542 let backend = backend.cloned().unwrap_or_else(|| {
543 INTERNER.intern_str("llvm")
545 run.builder.ensure(CodegenBackend {
546 compiler: run.builder.compiler(run.builder.top_stage, run.host),
552 fn run(self, builder: &Builder<'_>) {
553 let compiler = self.compiler;
554 let target = self.target;
555 let backend = self.backend;
557 builder.ensure(Rustc { compiler, target });
559 if builder.config.keep_stage.contains(&compiler.stage) {
560 builder.info("Warning: Using a potentially old codegen backend. \
561 This may not behave well.");
562 // Codegen backends are linked separately from this step today, so we don't do
567 let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
568 if compiler_to_use != compiler {
569 builder.ensure(CodegenBackend {
570 compiler: compiler_to_use,
577 let out_dir = builder.cargo_out(compiler, Mode::Codegen, target);
579 let mut cargo = builder.cargo(compiler, Mode::Codegen, target, "build");
580 cargo.arg("--manifest-path")
581 .arg(builder.src.join("src/librustc_codegen_llvm/Cargo.toml"));
582 rustc_cargo_env(builder, &mut cargo);
584 let features = build_codegen_backend(&builder, &mut cargo, &compiler, target, backend);
585 cargo.arg("--features").arg(features);
587 let tmp_stamp = out_dir.join(".tmp.stamp");
589 let files = run_cargo(builder, cargo, vec![], &tmp_stamp, false);
590 if builder.config.dry_run {
593 let mut files = files.into_iter()
595 let filename = f.file_name().unwrap().to_str().unwrap();
596 is_dylib(filename) && filename.contains("rustc_codegen_llvm-")
598 let codegen_backend = match files.next() {
600 None => panic!("no dylibs built for codegen backend?"),
602 if let Some(f) = files.next() {
603 panic!("codegen backend built two dylibs:\n{}\n{}",
604 codegen_backend.display(),
607 let stamp = codegen_backend_stamp(builder, compiler, target, backend);
608 let codegen_backend = codegen_backend.to_str().unwrap();
609 t!(fs::write(&stamp, &codegen_backend));
613 pub fn build_codegen_backend(builder: &Builder<'_>,
616 target: Interned<String>,
617 backend: Interned<String>) -> String {
618 let mut features = String::new();
621 "llvm" | "emscripten" => {
622 // Build LLVM for our target. This will implicitly build the
623 // host LLVM if necessary.
624 let llvm_config = builder.ensure(native::Llvm {
626 emscripten: backend == "emscripten",
629 if backend == "emscripten" {
630 features.push_str(" emscripten");
633 builder.info(&format!("Building stage{} codegen artifacts ({} -> {}, {})",
634 compiler.stage, &compiler.host, target, backend));
636 // Pass down configuration from the LLVM build into the build of
637 // librustc_llvm and librustc_codegen_llvm.
638 if builder.is_rust_llvm(target) && backend != "emscripten" {
639 cargo.env("LLVM_RUSTLLVM", "1");
642 cargo.env("LLVM_CONFIG", &llvm_config);
643 if backend != "emscripten" {
644 let target_config = builder.config.target_config.get(&target);
645 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
646 cargo.env("CFG_LLVM_ROOT", s);
649 // Some LLVM linker flags (-L and -l) may be needed to link librustc_llvm.
650 if let Some(ref s) = builder.config.llvm_ldflags {
651 cargo.env("LLVM_LINKER_FLAGS", s);
653 // Building with a static libstdc++ is only supported on linux right now,
654 // not for MSVC or macOS
655 if builder.config.llvm_static_stdcpp &&
656 !target.contains("freebsd") &&
657 !target.contains("windows") &&
658 !target.contains("apple") {
659 let file = compiler_file(builder,
660 builder.cxx(target).unwrap(),
663 cargo.env("LLVM_STATIC_STDCPP", file);
665 if builder.config.llvm_link_shared ||
666 (builder.config.llvm_thin_lto && backend != "emscripten")
668 cargo.env("LLVM_LINK_SHARED", "1");
670 if builder.config.llvm_use_libcxx {
671 cargo.env("LLVM_USE_LIBCXX", "1");
673 if builder.config.llvm_optimize && !builder.config.llvm_release_debuginfo {
674 cargo.env("LLVM_NDEBUG", "1");
677 _ => panic!("unknown backend: {}", backend),
683 /// Creates the `codegen-backends` folder for a compiler that's about to be
684 /// assembled as a complete compiler.
686 /// This will take the codegen artifacts produced by `compiler` and link them
687 /// into an appropriate location for `target_compiler` to be a functional
689 fn copy_codegen_backends_to_sysroot(builder: &Builder<'_>,
691 target_compiler: Compiler) {
692 let target = target_compiler.host;
694 // Note that this step is different than all the other `*Link` steps in
695 // that it's not assembling a bunch of libraries but rather is primarily
696 // moving the codegen backend into place. The codegen backend of rustc is
697 // not linked into the main compiler by default but is rather dynamically
698 // selected at runtime for inclusion.
700 // Here we're looking for the output dylib of the `CodegenBackend` step and
701 // we're copying that into the `codegen-backends` folder.
702 let dst = builder.sysroot_codegen_backends(target_compiler);
703 t!(fs::create_dir_all(&dst));
705 if builder.config.dry_run {
709 for backend in builder.config.rust_codegen_backends.iter() {
710 let stamp = codegen_backend_stamp(builder, compiler, target, *backend);
711 let dylib = t!(fs::read_to_string(&stamp));
712 let file = Path::new(&dylib);
713 let filename = file.file_name().unwrap().to_str().unwrap();
714 // change `librustc_codegen_llvm-xxxxxx.so` to `librustc_codegen_llvm-llvm.so`
715 let target_filename = {
716 let dash = filename.find('-').unwrap();
717 let dot = filename.find('.').unwrap();
723 builder.copy(&file, &dst.join(target_filename));
727 fn copy_lld_to_sysroot(builder: &Builder<'_>,
728 target_compiler: Compiler,
729 lld_install_root: &Path) {
730 let target = target_compiler.host;
732 let dst = builder.sysroot_libdir(target_compiler, target)
736 t!(fs::create_dir_all(&dst));
738 let src_exe = exe("lld", &target);
739 let dst_exe = exe("rust-lld", &target);
740 // we prepend this bin directory to the user PATH when linking Rust binaries. To
741 // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
742 builder.copy(&lld_install_root.join("bin").join(&src_exe), &dst.join(&dst_exe));
745 /// Cargo's output path for the standard library in a given stage, compiled
746 /// by a particular compiler for the specified target.
748 builder: &Builder<'_>,
750 target: Interned<String>,
752 builder.cargo_out(compiler, Mode::Std, target).join(".libstd.stamp")
755 /// Cargo's output path for librustc in a given stage, compiled by a particular
756 /// compiler for the specified target.
757 pub fn librustc_stamp(
758 builder: &Builder<'_>,
760 target: Interned<String>,
762 builder.cargo_out(compiler, Mode::Rustc, target).join(".librustc.stamp")
765 /// Cargo's output path for librustc_codegen_llvm in a given stage, compiled by a particular
766 /// compiler for the specified target and backend.
767 fn codegen_backend_stamp(builder: &Builder<'_>,
769 target: Interned<String>,
770 backend: Interned<String>) -> PathBuf {
771 builder.cargo_out(compiler, Mode::Codegen, target)
772 .join(format!(".librustc_codegen_llvm-{}.stamp", backend))
775 pub fn compiler_file(
776 builder: &Builder<'_>,
778 target: Interned<String>,
781 let mut cmd = Command::new(compiler);
782 cmd.args(builder.cflags(target, GitRepo::Rustc));
783 cmd.arg(format!("-print-file-name={}", file));
784 let out = output(&mut cmd);
785 PathBuf::from(out.trim())
788 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
790 pub compiler: Compiler,
793 impl Step for Sysroot {
794 type Output = Interned<PathBuf>;
796 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
800 /// Returns the sysroot for the `compiler` specified that *this build system
803 /// That is, the sysroot for the stage0 compiler is not what the compiler
804 /// thinks it is by default, but it's the same as the default for stages
806 fn run(self, builder: &Builder<'_>) -> Interned<PathBuf> {
807 let compiler = self.compiler;
808 let sysroot = if compiler.stage == 0 {
809 builder.out.join(&compiler.host).join("stage0-sysroot")
811 builder.out.join(&compiler.host).join(format!("stage{}", compiler.stage))
813 let _ = fs::remove_dir_all(&sysroot);
814 t!(fs::create_dir_all(&sysroot));
815 INTERNER.intern_path(sysroot)
819 #[derive(Debug, Copy, PartialOrd, Ord, Clone, PartialEq, Eq, Hash)]
820 pub struct Assemble {
821 /// The compiler which we will produce in this step. Assemble itself will
822 /// take care of ensuring that the necessary prerequisites to do so exist,
823 /// that is, this target can be a stage2 compiler and Assemble will build
824 /// previous stages for you.
825 pub target_compiler: Compiler,
828 impl Step for Assemble {
829 type Output = Compiler;
831 fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
835 /// Prepare a new compiler from the artifacts in `stage`
837 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
838 /// must have been previously produced by the `stage - 1` builder.build
840 fn run(self, builder: &Builder<'_>) -> Compiler {
841 let target_compiler = self.target_compiler;
843 if target_compiler.stage == 0 {
844 assert_eq!(builder.config.build, target_compiler.host,
845 "Cannot obtain compiler for non-native build triple at stage 0");
846 // The stage 0 compiler for the build triple is always pre-built.
847 return target_compiler;
850 // Get the compiler that we'll use to bootstrap ourselves.
852 // Note that this is where the recursive nature of the bootstrap
853 // happens, as this will request the previous stage's compiler on
854 // downwards to stage 0.
856 // Also note that we're building a compiler for the host platform. We
857 // only assume that we can run `build` artifacts, which means that to
858 // produce some other architecture compiler we need to start from
859 // `build` to get there.
861 // FIXME: Perhaps we should download those libraries?
862 // It would make builds faster...
864 // FIXME: It may be faster if we build just a stage 1 compiler and then
865 // use that to bootstrap this compiler forward.
867 builder.compiler(target_compiler.stage - 1, builder.config.build);
869 // Build the libraries for this compiler to link to (i.e., the libraries
870 // it uses at runtime). NOTE: Crates the target compiler compiles don't
871 // link to these. (FIXME: Is that correct? It seems to be correct most
872 // of the time but I think we do link to these for stage2/bin compilers
873 // when not performing a full bootstrap).
874 builder.ensure(Rustc {
875 compiler: build_compiler,
876 target: target_compiler.host,
878 for &backend in builder.config.rust_codegen_backends.iter() {
879 builder.ensure(CodegenBackend {
880 compiler: build_compiler,
881 target: target_compiler.host,
886 let lld_install = if builder.config.lld_enabled {
887 Some(builder.ensure(native::Lld {
888 target: target_compiler.host,
894 let stage = target_compiler.stage;
895 let host = target_compiler.host;
896 builder.info(&format!("Assembling stage{} compiler ({})", stage, host));
898 // Link in all dylibs to the libdir
899 let sysroot = builder.sysroot(target_compiler);
900 let rustc_libdir = builder.rustc_libdir(target_compiler);
901 t!(fs::create_dir_all(&rustc_libdir));
902 let src_libdir = builder.sysroot_libdir(build_compiler, host);
903 for f in builder.read_dir(&src_libdir) {
904 let filename = f.file_name().into_string().unwrap();
905 if is_dylib(&filename) {
906 builder.copy(&f.path(), &rustc_libdir.join(&filename));
910 copy_codegen_backends_to_sysroot(builder,
913 if let Some(lld_install) = lld_install {
914 copy_lld_to_sysroot(builder, target_compiler, &lld_install);
917 dist::maybe_install_llvm_dylib(builder, target_compiler.host, &sysroot);
919 // Link the compiler binary itself into place
920 let out_dir = builder.cargo_out(build_compiler, Mode::Rustc, host);
921 let rustc = out_dir.join(exe("rustc_binary", &*host));
922 let bindir = sysroot.join("bin");
923 t!(fs::create_dir_all(&bindir));
924 let compiler = builder.rustc(target_compiler);
925 let _ = fs::remove_file(&compiler);
926 builder.copy(&rustc, &compiler);
932 /// Link some files into a rustc sysroot.
934 /// For a particular stage this will link the file listed in `stamp` into the
935 /// `sysroot_dst` provided.
936 pub fn add_to_sysroot(
937 builder: &Builder<'_>,
939 sysroot_host_dst: &Path,
942 t!(fs::create_dir_all(&sysroot_dst));
943 t!(fs::create_dir_all(&sysroot_host_dst));
944 for (path, host) in builder.read_stamp_file(stamp) {
946 builder.copy(&path, &sysroot_host_dst.join(path.file_name().unwrap()));
948 builder.copy(&path, &sysroot_dst.join(path.file_name().unwrap()));
953 pub fn run_cargo(builder: &Builder<'_>,
955 tail_args: Vec<String>,
960 if builder.config.dry_run {
964 // `target_root_dir` looks like $dir/$target/release
965 let target_root_dir = stamp.parent().unwrap();
966 // `target_deps_dir` looks like $dir/$target/release/deps
967 let target_deps_dir = target_root_dir.join("deps");
968 // `host_root_dir` looks like $dir/release
969 let host_root_dir = target_root_dir.parent().unwrap() // chop off `release`
970 .parent().unwrap() // chop off `$target`
971 .join(target_root_dir.file_name().unwrap());
973 // Spawn Cargo slurping up its JSON output. We'll start building up the
974 // `deps` array of all files it generated along with a `toplevel` array of
975 // files we need to probe for later.
976 let mut deps = Vec::new();
977 let mut toplevel = Vec::new();
978 let ok = stream_cargo(builder, cargo, tail_args, &mut |msg| {
979 let (filenames, crate_types) = match msg {
980 CargoMessage::CompilerArtifact {
982 target: CargoTarget {
986 } => (filenames, crate_types),
989 for filename in filenames {
990 // Skip files like executables
991 if !filename.ends_with(".rlib") &&
992 !filename.ends_with(".lib") &&
993 !filename.ends_with(".a") &&
994 !is_dylib(&filename) &&
995 !(is_check && filename.ends_with(".rmeta")) {
999 let filename = Path::new(&*filename);
1001 // If this was an output file in the "host dir" we don't actually
1002 // worry about it, it's not relevant for us
1003 if filename.starts_with(&host_root_dir) {
1004 // Unless it's a proc macro used in the compiler
1005 if crate_types.iter().any(|t| t == "proc-macro") {
1006 deps.push((filename.to_path_buf(), true));
1011 // If this was output in the `deps` dir then this is a precise file
1012 // name (hash included) so we start tracking it.
1013 if filename.starts_with(&target_deps_dir) {
1014 deps.push((filename.to_path_buf(), false));
1018 // Otherwise this was a "top level artifact" which right now doesn't
1019 // have a hash in the name, but there's a version of this file in
1020 // the `deps` folder which *does* have a hash in the name. That's
1021 // the one we'll want to we'll probe for it later.
1023 // We do not use `Path::file_stem` or `Path::extension` here,
1024 // because some generated files may have multiple extensions e.g.
1025 // `std-<hash>.dll.lib` on Windows. The aforementioned methods only
1026 // split the file name by the last extension (`.lib`) while we need
1027 // to split by all extensions (`.dll.lib`).
1028 let expected_len = t!(filename.metadata()).len();
1029 let filename = filename.file_name().unwrap().to_str().unwrap();
1030 let mut parts = filename.splitn(2, '.');
1031 let file_stem = parts.next().unwrap().to_owned();
1032 let extension = parts.next().unwrap().to_owned();
1034 toplevel.push((file_stem, extension, expected_len));
1042 // Ok now we need to actually find all the files listed in `toplevel`. We've
1043 // got a list of prefix/extensions and we basically just need to find the
1044 // most recent file in the `deps` folder corresponding to each one.
1045 let contents = t!(target_deps_dir.read_dir())
1047 .map(|e| (e.path(), e.file_name().into_string().unwrap(), t!(e.metadata())))
1048 .collect::<Vec<_>>();
1049 for (prefix, extension, expected_len) in toplevel {
1050 let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
1051 filename.starts_with(&prefix[..]) &&
1052 filename[prefix.len()..].starts_with("-") &&
1053 filename.ends_with(&extension[..]) &&
1054 meta.len() == expected_len
1056 let max = candidates.max_by_key(|&&(_, _, ref metadata)| {
1057 FileTime::from_last_modification_time(metadata)
1059 let path_to_add = match max {
1060 Some(triple) => triple.0.to_str().unwrap(),
1061 None => panic!("no output generated for {:?} {:?}", prefix, extension),
1063 if is_dylib(path_to_add) {
1064 let candidate = format!("{}.lib", path_to_add);
1065 let candidate = PathBuf::from(candidate);
1066 if candidate.exists() {
1067 deps.push((candidate, false));
1070 deps.push((path_to_add.into(), false));
1074 let mut new_contents = Vec::new();
1075 for (dep, proc_macro) in deps.iter() {
1076 new_contents.extend(if *proc_macro { b"h" } else { b"t" });
1077 new_contents.extend(dep.to_str().unwrap().as_bytes());
1078 new_contents.extend(b"\0");
1080 t!(fs::write(&stamp, &new_contents));
1081 deps.into_iter().map(|(d, _)| d).collect()
1084 pub fn stream_cargo(
1085 builder: &Builder<'_>,
1087 tail_args: Vec<String>,
1088 cb: &mut dyn FnMut(CargoMessage<'_>),
1090 let mut cargo = Command::from(cargo);
1091 if builder.config.dry_run {
1094 // Instruct Cargo to give us json messages on stdout, critically leaving
1095 // stderr as piped so we can get those pretty colors.
1096 let mut message_format = String::from("json-render-diagnostics");
1097 if let Some(s) = &builder.config.rustc_error_format {
1098 message_format.push_str(",json-diagnostic-");
1099 message_format.push_str(s);
1101 cargo.arg("--message-format").arg(message_format).stdout(Stdio::piped());
1103 for arg in tail_args {
1107 builder.verbose(&format!("running: {:?}", cargo));
1108 let mut child = match cargo.spawn() {
1110 Err(e) => panic!("failed to execute command: {:?}\nerror: {}", cargo, e),
1113 // Spawn Cargo slurping up its JSON output. We'll start building up the
1114 // `deps` array of all files it generated along with a `toplevel` array of
1115 // files we need to probe for later.
1116 let stdout = BufReader::new(child.stdout.take().unwrap());
1117 for line in stdout.lines() {
1118 let line = t!(line);
1119 match serde_json::from_str::<CargoMessage<'_>>(&line) {
1121 // If this was informational, just print it out and continue
1122 Err(_) => println!("{}", line)
1126 // Make sure Cargo actually succeeded after we read all of its stdout.
1127 let status = t!(child.wait());
1128 if !status.success() {
1129 eprintln!("command did not execute successfully: {:?}\n\
1130 expected success, got: {}",
1137 #[derive(Deserialize)]
1138 pub struct CargoTarget<'a> {
1139 crate_types: Vec<Cow<'a, str>>,
1142 #[derive(Deserialize)]
1143 #[serde(tag = "reason", rename_all = "kebab-case")]
1144 pub enum CargoMessage<'a> {
1146 package_id: Cow<'a, str>,
1147 features: Vec<Cow<'a, str>>,
1148 filenames: Vec<Cow<'a, str>>,
1149 target: CargoTarget<'a>,
1151 BuildScriptExecuted {
1152 package_id: Cow<'a, str>,