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");
54 cargo.arg("--features").arg(features)
55 .arg("--manifest-path")
56 .arg(build.src.join("src/rustc/std_shim/Cargo.toml"));
58 if let Some(target) = build.config.target_config.get(target) {
59 if let Some(ref jemalloc) = target.jemalloc {
60 cargo.env("JEMALLOC_OVERRIDE", jemalloc);
63 if target.contains("musl") {
64 if let Some(p) = build.musl_root(target) {
65 cargo.env("MUSL_ROOT", p);
69 build.run(&mut cargo);
70 update_mtime(build, &libstd_stamp(build, &compiler, target));
73 /// Link all libstd rlibs/dylibs into the sysroot location.
75 /// Links those artifacts generated by `compiler` to a the `stage` compiler's
76 /// sysroot for the specified `host` and `target`.
78 /// Note that this assumes that `compiler` has already generated the libstd
79 /// libraries for `target`, and this method will find them in the relevant
81 pub fn std_link(build: &Build,
83 target_compiler: &Compiler,
85 println!("Copying stage{} std from stage{} ({} -> {} / {})",
86 target_compiler.stage,
91 let libdir = build.sysroot_libdir(&target_compiler, target);
92 let out_dir = build.cargo_out(&compiler, Mode::Libstd, target);
94 t!(fs::create_dir_all(&libdir));
95 add_to_sysroot(&out_dir, &libdir);
97 if target.contains("musl") && !target.contains("mips") {
98 copy_musl_third_party_objects(build, target, &libdir);
102 /// Copies the crt(1,i,n).o startup objects
104 /// Only required for musl targets that statically link to libc
105 fn copy_musl_third_party_objects(build: &Build, target: &str, into: &Path) {
106 for &obj in &["crt1.o", "crti.o", "crtn.o"] {
107 copy(&build.musl_root(target).unwrap().join("lib").join(obj), &into.join(obj));
111 /// Build and prepare startup objects like rsbegin.o and rsend.o
113 /// These are primarily used on Windows right now for linking executables/dlls.
114 /// They don't require any library support as they're just plain old object
115 /// files, so we just use the nightly snapshot compiler to always build them (as
116 /// no other compilers are guaranteed to be available).
117 pub fn build_startup_objects(build: &Build, for_compiler: &Compiler, target: &str) {
118 if !target.contains("pc-windows-gnu") {
122 let compiler = Compiler::new(0, &build.config.build);
123 let compiler_path = build.compiler_path(&compiler);
124 let into = build.sysroot_libdir(for_compiler, target);
125 t!(fs::create_dir_all(&into));
127 for file in t!(fs::read_dir(build.src.join("src/rtstartup"))) {
129 let mut cmd = Command::new(&compiler_path);
130 build.run(cmd.env("RUSTC_BOOTSTRAP", "1")
131 .arg("--target").arg(target)
133 .arg("--out-dir").arg(&into)
137 for obj in ["crt2.o", "dllcrt2.o"].iter() {
138 copy(&compiler_file(build.cc(target), obj), &into.join(obj));
144 /// This will build libtest and supporting libraries for a particular stage of
145 /// the build using the `compiler` targeting the `target` architecture. The
146 /// artifacts created will also be linked into the sysroot directory.
147 pub fn test(build: &Build, target: &str, compiler: &Compiler) {
148 println!("Building stage{} test artifacts ({} -> {})", compiler.stage,
149 compiler.host, target);
150 let out_dir = build.cargo_out(compiler, Mode::Libtest, target);
151 build.clear_if_dirty(&out_dir, &libstd_stamp(build, compiler, target));
152 let mut cargo = build.cargo(compiler, Mode::Libtest, target, "build");
153 cargo.arg("--manifest-path")
154 .arg(build.src.join("src/rustc/test_shim/Cargo.toml"));
155 build.run(&mut cargo);
156 update_mtime(build, &libtest_stamp(build, compiler, target));
159 /// Same as `std_link`, only for libtest
160 pub fn test_link(build: &Build,
162 target_compiler: &Compiler,
164 println!("Copying stage{} test from stage{} ({} -> {} / {})",
165 target_compiler.stage,
168 target_compiler.host,
170 let libdir = build.sysroot_libdir(&target_compiler, target);
171 let out_dir = build.cargo_out(&compiler, Mode::Libtest, target);
172 add_to_sysroot(&out_dir, &libdir);
175 /// Build the compiler.
177 /// This will build the compiler for a particular stage of the build using
178 /// the `compiler` targeting the `target` architecture. The artifacts
179 /// created will also be linked into the sysroot directory.
180 pub fn rustc(build: &Build, target: &str, compiler: &Compiler) {
181 println!("Building stage{} compiler artifacts ({} -> {})",
182 compiler.stage, compiler.host, target);
184 let out_dir = build.cargo_out(compiler, Mode::Librustc, target);
185 build.clear_if_dirty(&out_dir, &libtest_stamp(build, compiler, target));
187 let mut cargo = build.cargo(compiler, Mode::Librustc, target, "build");
188 cargo.arg("--features").arg(build.rustc_features())
189 .arg("--manifest-path")
190 .arg(build.src.join("src/rustc/Cargo.toml"));
192 // Set some configuration variables picked up by build scripts and
193 // the compiler alike
194 cargo.env("CFG_RELEASE", &build.release)
195 .env("CFG_RELEASE_CHANNEL", &build.config.channel)
196 .env("CFG_VERSION", &build.version)
197 .env("CFG_PREFIX", build.config.prefix.clone().unwrap_or(PathBuf::new()));
199 if compiler.stage == 0 {
200 cargo.env("CFG_LIBDIR_RELATIVE", "lib");
202 let libdir_relative = build.config.libdir_relative.clone().unwrap_or(PathBuf::from("lib"));
203 cargo.env("CFG_LIBDIR_RELATIVE", libdir_relative);
206 // If we're not building a compiler with debugging information then remove
207 // these two env vars which would be set otherwise.
208 if build.config.rust_debuginfo_only_std {
209 cargo.env_remove("RUSTC_DEBUGINFO");
210 cargo.env_remove("RUSTC_DEBUGINFO_LINES");
213 if let Some(ref ver_date) = build.ver_date {
214 cargo.env("CFG_VER_DATE", ver_date);
216 if let Some(ref ver_hash) = build.ver_hash {
217 cargo.env("CFG_VER_HASH", ver_hash);
219 if !build.unstable_features {
220 cargo.env("CFG_DISABLE_UNSTABLE_FEATURES", "1");
222 // Flag that rust llvm is in use
223 if build.is_rust_llvm(target) {
224 cargo.env("LLVM_RUSTLLVM", "1");
226 cargo.env("LLVM_CONFIG", build.llvm_config(target));
227 let target_config = build.config.target_config.get(target);
228 if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
229 cargo.env("CFG_LLVM_ROOT", s);
231 // Building with a static libstdc++ is only supported on linux right now,
232 // not for MSVC or OSX
233 if build.config.llvm_static_stdcpp &&
234 !target.contains("windows") &&
235 !target.contains("apple") {
236 cargo.env("LLVM_STATIC_STDCPP",
237 compiler_file(build.cxx(target), "libstdc++.a"));
239 if build.config.llvm_link_shared {
240 cargo.env("LLVM_LINK_SHARED", "1");
242 if let Some(ref s) = build.config.rustc_default_linker {
243 cargo.env("CFG_DEFAULT_LINKER", s);
245 if let Some(ref s) = build.config.rustc_default_ar {
246 cargo.env("CFG_DEFAULT_AR", s);
248 build.run(&mut cargo);
251 /// Same as `std_link`, only for librustc
252 pub fn rustc_link(build: &Build,
254 target_compiler: &Compiler,
256 println!("Copying stage{} rustc from stage{} ({} -> {} / {})",
257 target_compiler.stage,
260 target_compiler.host,
262 let libdir = build.sysroot_libdir(&target_compiler, target);
263 let out_dir = build.cargo_out(&compiler, Mode::Librustc, target);
264 add_to_sysroot(&out_dir, &libdir);
267 /// Cargo's output path for the standard library in a given stage, compiled
268 /// by a particular compiler for the specified target.
269 fn libstd_stamp(build: &Build, compiler: &Compiler, target: &str) -> PathBuf {
270 build.cargo_out(compiler, Mode::Libstd, target).join(".libstd.stamp")
273 /// Cargo's output path for libtest in a given stage, compiled by a particular
274 /// compiler for the specified target.
275 fn libtest_stamp(build: &Build, compiler: &Compiler, target: &str) -> PathBuf {
276 build.cargo_out(compiler, Mode::Libtest, target).join(".libtest.stamp")
279 fn compiler_file(compiler: &Path, file: &str) -> PathBuf {
280 let out = output(Command::new(compiler)
281 .arg(format!("-print-file-name={}", file)));
282 PathBuf::from(out.trim())
285 pub fn create_sysroot(build: &Build, compiler: &Compiler) {
286 let sysroot = build.sysroot(compiler);
287 let _ = fs::remove_dir_all(&sysroot);
288 t!(fs::create_dir_all(&sysroot));
291 /// Prepare a new compiler from the artifacts in `stage`
293 /// This will assemble a compiler in `build/$host/stage$stage`. The compiler
294 /// must have been previously produced by the `stage - 1` build.config.build
296 pub fn assemble_rustc(build: &Build, stage: u32, host: &str) {
297 // nothing to do in stage0
302 println!("Copying stage{} compiler ({})", stage, host);
304 // The compiler that we're assembling
305 let target_compiler = Compiler::new(stage, host);
307 // The compiler that compiled the compiler we're assembling
308 let build_compiler = Compiler::new(stage - 1, &build.config.build);
310 // Link in all dylibs to the libdir
311 let sysroot = build.sysroot(&target_compiler);
312 let sysroot_libdir = sysroot.join(libdir(host));
313 t!(fs::create_dir_all(&sysroot_libdir));
314 let src_libdir = build.sysroot_libdir(&build_compiler, host);
315 for f in t!(fs::read_dir(&src_libdir)).map(|f| t!(f)) {
316 let filename = f.file_name().into_string().unwrap();
317 if is_dylib(&filename) {
318 copy(&f.path(), &sysroot_libdir.join(&filename));
322 let out_dir = build.cargo_out(&build_compiler, Mode::Librustc, host);
324 // Link the compiler binary itself into place
325 let rustc = out_dir.join(exe("rustc", host));
326 let bindir = sysroot.join("bin");
327 t!(fs::create_dir_all(&bindir));
328 let compiler = build.compiler_path(&Compiler::new(stage, host));
329 let _ = fs::remove_file(&compiler);
330 copy(&rustc, &compiler);
332 // See if rustdoc exists to link it into place
333 let rustdoc = exe("rustdoc", host);
334 let rustdoc_src = out_dir.join(&rustdoc);
335 let rustdoc_dst = bindir.join(&rustdoc);
336 if fs::metadata(&rustdoc_src).is_ok() {
337 let _ = fs::remove_file(&rustdoc_dst);
338 copy(&rustdoc_src, &rustdoc_dst);
342 /// Link some files into a rustc sysroot.
344 /// For a particular stage this will link all of the contents of `out_dir`
345 /// into the sysroot of the `host` compiler, assuming the artifacts are
346 /// compiled for the specified `target`.
347 fn add_to_sysroot(out_dir: &Path, sysroot_dst: &Path) {
348 // Collect the set of all files in the dependencies directory, keyed
349 // off the name of the library. We assume everything is of the form
350 // `foo-<hash>.{rlib,so,...}`, and there could be multiple different
351 // `<hash>` values for the same name (of old builds).
352 let mut map = HashMap::new();
353 for file in t!(fs::read_dir(out_dir.join("deps"))).map(|f| t!(f)) {
354 let filename = file.file_name().into_string().unwrap();
356 // We're only interested in linking rlibs + dylibs, other things like
357 // unit tests don't get linked in
358 if !filename.ends_with(".rlib") &&
359 !filename.ends_with(".lib") &&
360 !is_dylib(&filename) {
363 let file = file.path();
364 let dash = filename.find("-").unwrap();
365 let key = (filename[..dash].to_string(),
366 file.extension().unwrap().to_owned());
367 map.entry(key).or_insert(Vec::new())
371 // For all hash values found, pick the most recent one to move into the
372 // sysroot, that should be the one we just built.
373 for (_, paths) in map {
374 let (_, path) = paths.iter().map(|path| {
375 (mtime(&path).seconds(), path)
377 copy(&path, &sysroot_dst.join(path.file_name().unwrap()));
381 /// Build a tool in `src/tools`
383 /// This will build the specified tool with the specified `host` compiler in
384 /// `stage` into the normal cargo output directory.
385 pub fn tool(build: &Build, stage: u32, host: &str, tool: &str) {
386 println!("Building stage{} tool {} ({})", stage, tool, host);
388 let compiler = Compiler::new(stage, host);
390 // FIXME: need to clear out previous tool and ideally deps, may require
391 // isolating output directories or require a pseudo shim step to
392 // clear out all the info.
394 // Maybe when libstd is compiled it should clear out the rustc of the
395 // corresponding stage?
396 // let out_dir = build.cargo_out(stage, &host, Mode::Librustc, target);
397 // build.clear_if_dirty(&out_dir, &libstd_stamp(build, stage, &host, target));
399 let mut cargo = build.cargo(&compiler, Mode::Tool, host, "build");
400 cargo.arg("--manifest-path")
401 .arg(build.src.join(format!("src/tools/{}/Cargo.toml", tool)));
403 // We don't want to build tools dynamically as they'll be running across
404 // stages and such and it's just easier if they're not dynamically linked.
405 cargo.env("RUSTC_NO_PREFER_DYNAMIC", "1");
407 build.run(&mut cargo);
410 /// Updates the mtime of a stamp file if necessary, only changing it if it's
411 /// older than some other library file in the same directory.
413 /// We don't know what file Cargo is going to output (because there's a hash in
414 /// the file name) but we know where it's going to put it. We use this helper to
415 /// detect changes to that output file by looking at the modification time for
416 /// all files in a directory and updating the stamp if any are newer.
418 /// Note that we only consider Rust libraries as that's what we're interested in
419 /// propagating changes from. Files like executables are tracked elsewhere.
420 fn update_mtime(build: &Build, path: &Path) {
421 let entries = match path.parent().unwrap().join("deps").read_dir() {
422 Ok(entries) => entries,
425 let files = entries.map(|e| t!(e)).filter(|e| t!(e.file_type()).is_file());
426 let files = files.filter(|e| {
427 let filename = e.file_name();
428 let filename = filename.to_str().unwrap();
429 filename.ends_with(".rlib") ||
430 filename.ends_with(".lib") ||
433 let max = files.max_by_key(|entry| {
434 let meta = t!(entry.metadata());
435 FileTime::from_last_modification_time(&meta)
437 let max = match max {
442 if mtime(&max.path()) > mtime(path) {
443 build.verbose(&format!("updating {:?} as {:?} changed", path, max.path()));
444 t!(File::create(path));