1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Implementation of compiling various phases of the compiler and standard
14 //! This module contains some of the real meat in the rustbuild build system
15 //! which is where Cargo is used to compiler the standard library, libtest, and
16 //! compiler. This module is also responsible for assembling the sysroot as it
17 //! goes along from the output of the previous stage.
19 use std::collections::HashMap;
20 use std::fs::{self, File};
21 use std::path::{Path, PathBuf};
22 use std::process::Command;
24 use build_helper::{output, mtime};
25 use filetime::FileTime;
27 use util::{exe, libdir, is_dylib, copy};
28 use {Build, Compiler, Mode};
30 /// Build the standard library.
32 /// This will build the standard library for a particular stage of the build
33 /// using the `compiler` targeting the `target` architecture. The artifacts
34 /// created will also be linked into the sysroot directory.
35 pub fn std(build: &Build, target: &str, compiler: &Compiler) {
36 let libdir = build.sysroot_libdir(compiler, target);
37 t!(fs::create_dir_all(&libdir));
39 println!("Building stage{} std artifacts ({} -> {})", compiler.stage,
40 compiler.host, target);
42 let out_dir = build.cargo_out(compiler, Mode::Libstd, target);
43 build.clear_if_dirty(&out_dir, &build.compiler_path(compiler));
44 let mut cargo = build.cargo(compiler, Mode::Libstd, target, "build");
45 let mut features = build.std_features();
46 // When doing a local rebuild we tell cargo that we're stage1 rather than
47 // stage0. This works fine if the local rust and being-built rust have the
48 // same view of what the default allocator is, but fails otherwise. Since
49 // we don't have a way to express an allocator preference yet, work
50 // around the issue in the case of a local rebuild with jemalloc disabled.
51 if compiler.stage == 0 && build.local_rebuild && !build.config.use_jemalloc {
52 features.push_str(" force_alloc_system");
55 if compiler.stage != 0 && build.config.sanitizers {
56 // This variable is used by the sanitizer runtime crates, e.g.
57 // rustc_lsan, to build the sanitizer runtime from C code
58 // When this variable is missing, those crates won't compile the C code,
59 // so we don't set this variable during stage0 where llvm-config is
61 // We also only build the runtimes when --enable-sanitizers (or its
62 // config.toml equivalent) is used
63 cargo.env("LLVM_CONFIG", build.llvm_config(target));
65 cargo.arg("--features").arg(features)
66 .arg("--manifest-path")
67 .arg(build.src.join("src/rustc/std_shim/Cargo.toml"));
69 if let Some(target) = build.config.target_config.get(target) {
70 if let Some(ref jemalloc) = target.jemalloc {
71 cargo.env("JEMALLOC_OVERRIDE", jemalloc);
74 if target.contains("musl") {
75 if let Some(p) = build.musl_root(target) {
76 cargo.env("MUSL_ROOT", p);
80 build.run(&mut cargo);
81 update_mtime(build, &libstd_stamp(build, &compiler, target));
84 /// Link all libstd rlibs/dylibs into the sysroot location.
86 /// Links those artifacts generated by `compiler` to a the `stage` compiler's
87 /// sysroot for the specified `host` and `target`.
89 /// Note that this assumes that `compiler` has already generated the libstd
90 /// libraries for `target`, and this method will find them in the relevant
92 pub fn std_link(build: &Build,
94 target_compiler: &Compiler,
96 println!("Copying stage{} std from stage{} ({} -> {} / {})",
97 target_compiler.stage,
100 target_compiler.host,
102 let libdir = build.sysroot_libdir(&target_compiler, target);
103 let out_dir = build.cargo_out(&compiler, Mode::Libstd, target);
105 t!(fs::create_dir_all(&libdir));
106 add_to_sysroot(&out_dir, &libdir);
108 if target.contains("musl") && !target.contains("mips") {
109 copy_musl_third_party_objects(build, target, &libdir);
113 /// Copies the crt(1,i,n).o startup objects
115 /// Only required for musl targets that statically link to libc
116 fn copy_musl_third_party_objects(build: &Build, target: &str, into: &Path) {
117 for &obj in &["crt1.o", "crti.o", "crtn.o"] {
118 copy(&build.musl_root(target).unwrap().join("lib").join(obj), &into.join(obj));
122 /// Build and prepare startup objects like rsbegin.o and rsend.o
124 /// These are primarily used on Windows right now for linking executables/dlls.
125 /// They don't require any library support as they're just plain old object
126 /// files, so we just use the nightly snapshot compiler to always build them (as
127 /// no other compilers are guaranteed to be available).
128 pub fn build_startup_objects(build: &Build, for_compiler: &Compiler, target: &str) {
129 if !target.contains("pc-windows-gnu") {
133 let compiler = Compiler::new(0, &build.config.build);
134 let compiler_path = build.compiler_path(&compiler);
135 let into = build.sysroot_libdir(for_compiler, target);
136 t!(fs::create_dir_all(&into));
138 for file in t!(fs::read_dir(build.src.join("src/rtstartup"))) {
140 let mut cmd = Command::new(&compiler_path);
141 build.run(cmd.env("RUSTC_BOOTSTRAP", "1")
142 .arg("--target").arg(target)
144 .arg("--out-dir").arg(&into)
148 for obj in ["crt2.o", "dllcrt2.o"].iter() {
149 copy(&compiler_file(build.cc(target), obj), &into.join(obj));
155 /// This will build libtest and supporting libraries for a particular stage of
156 /// the build using the `compiler` targeting the `target` architecture. The
157 /// artifacts created will also be linked into the sysroot directory.
158 pub fn test(build: &Build, target: &str, compiler: &Compiler) {
159 println!("Building stage{} test artifacts ({} -> {})", compiler.stage,
160 compiler.host, target);
161 let out_dir = build.cargo_out(compiler, Mode::Libtest, target);
162 build.clear_if_dirty(&out_dir, &libstd_stamp(build, compiler, target));
163 let mut cargo = build.cargo(compiler, Mode::Libtest, target, "build");
164 cargo.arg("--manifest-path")
165 .arg(build.src.join("src/rustc/test_shim/Cargo.toml"));
166 build.run(&mut cargo);
167 update_mtime(build, &libtest_stamp(build, compiler, target));
170 /// Same as `std_link`, only for libtest
171 pub fn test_link(build: &Build,
173 target_compiler: &Compiler,
175 println!("Copying stage{} test from stage{} ({} -> {} / {})",
176 target_compiler.stage,
179 target_compiler.host,
181 let libdir = build.sysroot_libdir(&target_compiler, target);
182 let out_dir = build.cargo_out(&compiler, Mode::Libtest, target);
183 add_to_sysroot(&out_dir, &libdir);
186 /// Build the compiler.
188 /// This will build the compiler for a particular stage of the build using
189 /// the `compiler` targeting the `target` architecture. The artifacts
190 /// created will also be linked into the sysroot directory.
191 pub fn rustc(build: &Build, target: &str, compiler: &Compiler) {
192 println!("Building stage{} compiler artifacts ({} -> {})",
193 compiler.stage, compiler.host, target);
195 let out_dir = build.cargo_out(compiler, Mode::Librustc, target);
196 build.clear_if_dirty(&out_dir, &libtest_stamp(build, compiler, target));
198 let mut cargo = build.cargo(compiler, Mode::Librustc, target, "build");
199 cargo.arg("--features").arg(build.rustc_features())
200 .arg("--manifest-path")
201 .arg(build.src.join("src/rustc/Cargo.toml"));
203 // Set some configuration variables picked up by build scripts and
204 // the compiler alike
205 cargo.env("CFG_RELEASE", &build.release)
206 .env("CFG_RELEASE_CHANNEL", &build.config.channel)
207 .env("CFG_VERSION", &build.version)
208 .env("CFG_PREFIX", build.config.prefix.clone().unwrap_or(PathBuf::new()));
210 if compiler.stage == 0 {
211 cargo.env("CFG_LIBDIR_RELATIVE", "lib");
213 let libdir_relative = build.config.libdir_relative.clone().unwrap_or(PathBuf::from("lib"));
214 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
217 // If we're not building a compiler with debugging information then remove
218 // these two env vars which would be set otherwise.
219 if build.config.rust_debuginfo_only_std {
220 cargo.env_remove("RUSTC_DEBUGINFO");
221 cargo.env_remove("RUSTC_DEBUGINFO_LINES");
224 if let Some(ref ver_date) = build.ver_date {
225 cargo.env("CFG_VER_DATE", ver_date);
227 if let Some(ref ver_hash) = build.ver_hash {
228 cargo.env("CFG_VER_HASH", ver_hash);
230 if !build.unstable_features {
231 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
233 // Flag that rust llvm is in use
234 if build.is_rust_llvm(target) {
235 cargo.env("LLVM_RUSTLLVM", "1");
237 cargo.env("LLVM_CONFIG", build.llvm_config(target));
238 let target_config = build.config.target_config.get(target);
239 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
240 cargo.env("CFG_LLVM_ROOT", s);
242 // Building with a static libstdc++ is only supported on linux right now,
243 // not for MSVC or OSX
244 if build.config.llvm_static_stdcpp &&
245 !target.contains("windows") &&
246 !target.contains("apple") {
247 cargo.env("LLVM_STATIC_STDCPP",
248 compiler_file(build.cxx(target), "libstdc++.a"));
250 if build.config.llvm_link_shared {
251 cargo.env("LLVM_LINK_SHARED", "1");
253 if let Some(ref s) = build.config.rustc_default_linker {
254 cargo.env("CFG_DEFAULT_LINKER", s);
256 if let Some(ref s) = build.config.rustc_default_ar {
257 cargo.env("CFG_DEFAULT_AR", s);
259 build.run(&mut cargo);
262 /// Same as `std_link`, only for librustc
263 pub fn rustc_link(build: &Build,
265 target_compiler: &Compiler,
267 println!("Copying stage{} rustc from stage{} ({} -> {} / {})",
268 target_compiler.stage,
271 target_compiler.host,
273 let libdir = build.sysroot_libdir(&target_compiler, target);
274 let out_dir = build.cargo_out(&compiler, Mode::Librustc, target);
275 add_to_sysroot(&out_dir, &libdir);
278 /// Cargo's output path for the standard library in a given stage, compiled
279 /// by a particular compiler for the specified target.
280 fn libstd_stamp(build: &Build, compiler: &Compiler, target: &str) -> PathBuf {
281 build.cargo_out(compiler, Mode::Libstd, target).join(".libstd.stamp")
284 /// Cargo's output path for libtest in a given stage, compiled by a particular
285 /// compiler for the specified target.
286 fn libtest_stamp(build: &Build, compiler: &Compiler, target: &str) -> PathBuf {
287 build.cargo_out(compiler, Mode::Libtest, target).join(".libtest.stamp")
290 fn compiler_file(compiler: &Path, file: &str) -> PathBuf {
291 let out = output(Command::new(compiler)
292 .arg(format!("-print-file-name={}", file)));
293 PathBuf::from(out.trim())
296 pub fn create_sysroot(build: &Build, compiler: &Compiler) {
297 let sysroot = build.sysroot(compiler);
298 let _ = fs::remove_dir_all(&sysroot);
299 t!(fs::create_dir_all(&sysroot));
302 /// Prepare a new compiler from the artifacts in `stage`
304 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
305 /// must have been previously produced by the `stage - 1` build.config.build
307 pub fn assemble_rustc(build: &Build, stage: u32, host: &str) {
308 // nothing to do in stage0
313 println!("Copying stage{} compiler ({})", stage, host);
315 // The compiler that we're assembling
316 let target_compiler = Compiler::new(stage, host);
318 // The compiler that compiled the compiler we're assembling
319 let build_compiler = Compiler::new(stage - 1, &build.config.build);
321 // Link in all dylibs to the libdir
322 let sysroot = build.sysroot(&target_compiler);
323 let sysroot_libdir = sysroot.join(libdir(host));
324 t!(fs::create_dir_all(&sysroot_libdir));
325 let src_libdir = build.sysroot_libdir(&build_compiler, host);
326 for f in t!(fs::read_dir(&src_libdir)).map(|f| t!(f)) {
327 let filename = f.file_name().into_string().unwrap();
328 if is_dylib(&filename) {
329 copy(&f.path(), &sysroot_libdir.join(&filename));
333 let out_dir = build.cargo_out(&build_compiler, Mode::Librustc, host);
335 // Link the compiler binary itself into place
336 let rustc = out_dir.join(exe("rustc", host));
337 let bindir = sysroot.join("bin");
338 t!(fs::create_dir_all(&bindir));
339 let compiler = build.compiler_path(&Compiler::new(stage, host));
340 let _ = fs::remove_file(&compiler);
341 copy(&rustc, &compiler);
343 // See if rustdoc exists to link it into place
344 let rustdoc = exe("rustdoc", host);
345 let rustdoc_src = out_dir.join(&rustdoc);
346 let rustdoc_dst = bindir.join(&rustdoc);
347 if fs::metadata(&rustdoc_src).is_ok() {
348 let _ = fs::remove_file(&rustdoc_dst);
349 copy(&rustdoc_src, &rustdoc_dst);
353 /// Link some files into a rustc sysroot.
355 /// For a particular stage this will link all of the contents of `out_dir`
356 /// into the sysroot of the `host` compiler, assuming the artifacts are
357 /// compiled for the specified `target`.
358 fn add_to_sysroot(out_dir: &Path, sysroot_dst: &Path) {
359 // Collect the set of all files in the dependencies directory, keyed
360 // off the name of the library. We assume everything is of the form
361 // `foo-<hash>.{rlib,so,...}`, and there could be multiple different
362 // `<hash>` values for the same name (of old builds).
363 let mut map = HashMap::new();
364 for file in t!(fs::read_dir(out_dir.join("deps"))).map(|f| t!(f)) {
365 let filename = file.file_name().into_string().unwrap();
367 // We're only interested in linking rlibs + dylibs, other things like
368 // unit tests don't get linked in
369 if !filename.ends_with(".rlib") &&
370 !filename.ends_with(".lib") &&
371 !is_dylib(&filename) {
374 let file = file.path();
375 let dash = filename.find("-").unwrap();
376 let key = (filename[..dash].to_string(),
377 file.extension().unwrap().to_owned());
378 map.entry(key).or_insert(Vec::new())
382 // For all hash values found, pick the most recent one to move into the
383 // sysroot, that should be the one we just built.
384 for (_, paths) in map {
385 let (_, path) = paths.iter().map(|path| {
386 (mtime(&path).seconds(), path)
388 copy(&path, &sysroot_dst.join(path.file_name().unwrap()));
392 /// Build a tool in `src/tools`
394 /// This will build the specified tool with the specified `host` compiler in
395 /// `stage` into the normal cargo output directory.
396 pub fn tool(build: &Build, stage: u32, target: &str, tool: &str) {
397 println!("Building stage{} tool {} ({})", stage, tool, target);
399 let compiler = Compiler::new(stage, &build.config.build);
401 // FIXME: need to clear out previous tool and ideally deps, may require
402 // isolating output directories or require a pseudo shim step to
403 // clear out all the info.
405 // Maybe when libstd is compiled it should clear out the rustc of the
406 // corresponding stage?
407 // let out_dir = build.cargo_out(stage, &host, Mode::Librustc, target);
408 // build.clear_if_dirty(&out_dir, &libstd_stamp(build, stage, &host, target));
410 let mut cargo = build.cargo(&compiler, Mode::Tool, target, "build");
411 cargo.arg("--manifest-path")
412 .arg(build.src.join(format!("src/tools/{}/Cargo.toml", tool)));
414 // We don't want to build tools dynamically as they'll be running across
415 // stages and such and it's just easier if they're not dynamically linked.
416 cargo.env("RUSTC_NO_PREFER_DYNAMIC", "1");
418 build.run(&mut cargo);
421 /// Updates the mtime of a stamp file if necessary, only changing it if it's
422 /// older than some other library file in the same directory.
424 /// We don't know what file Cargo is going to output (because there's a hash in
425 /// the file name) but we know where it's going to put it. We use this helper to
426 /// detect changes to that output file by looking at the modification time for
427 /// all files in a directory and updating the stamp if any are newer.
429 /// Note that we only consider Rust libraries as that's what we're interested in
430 /// propagating changes from. Files like executables are tracked elsewhere.
431 fn update_mtime(build: &Build, path: &Path) {
432 let entries = match path.parent().unwrap().join("deps").read_dir() {
433 Ok(entries) => entries,
436 let files = entries.map(|e| t!(e)).filter(|e| t!(e.file_type()).is_file());
437 let files = files.filter(|e| {
438 let filename = e.file_name();
439 let filename = filename.to_str().unwrap();
440 filename.ends_with(".rlib") ||
441 filename.ends_with(".lib") ||
444 let max = files.max_by_key(|entry| {
445 let meta = t!(entry.metadata());
446 FileTime::from_last_modification_time(&meta)
448 let max = match max {
453 if mtime(&max.path()) > mtime(path) {
454 build.verbose(&format!("updating {:?} as {:?} changed", path, max.path()));
455 t!(File::create(path));