1 // Copyright 2017 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 use serde::{Serialize, Deserialize};
13 use std::cell::RefCell;
14 use std::path::{Path, PathBuf};
15 use std::process::Command;
22 use util::{exe, libdir, add_lib_path};
24 use cache::{Cache, Key};
26 use flags::Subcommand;
32 pub struct Builder<'a> {
37 stack: RefCell<Vec<Key>>,
40 impl<'a> Deref for Builder<'a> {
43 fn deref(&self) -> &Self::Target {
48 pub trait Step<'a>: Serialize + Sized {
49 /// The output type of this step. This is used in a few places to return a
50 /// `PathBuf` when directories are created or to return a `Compiler` once
51 /// it's been assembled.
53 /// When possible, this should be used instead of implicitly creating files
54 /// in a prearranged directory that will later be used by the build system.
55 /// It's not always practical, however, since it makes avoiding rebuilds
57 type Output: Serialize + Deserialize<'a> + 'a;
59 const DEFAULT: bool = false;
61 /// Run this rule for all hosts without cross compiling.
62 const ONLY_HOSTS: bool = false;
64 /// Run this rule for all targets, but only with the native host.
65 const ONLY_BUILD_TARGETS: bool = false;
67 /// Only run this step with the build triple as host and target.
68 const ONLY_BUILD: bool = false;
70 /// Primary function to execute this rule. Can call `builder.ensure(...)`
71 /// with other steps to run those.
72 fn run(self, builder: &'a Builder) -> Self::Output;
74 /// When bootstrap is passed a set of paths, this controls whether this rule
75 /// will execute. However, it does not get called in a "default" context
76 /// when we are not passed any paths; in that case, make_run is called
78 fn should_run(_builder: &'a Builder, _path: &Path) -> bool { false }
80 /// Build up a "root" rule, either as a default rule or from a path passed
83 /// When path is `None`, we are executing in a context where no paths were
84 /// passed. When `./x.py build` is run, for example, this rule could get
85 /// called if it is in the correct list below with a path of `None`.
87 _builder: &'a Builder,
91 ) { unimplemented!() }
94 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
105 ($self:ident, $paths:ident, $($rule:ty),+ $(,)*) => {{
107 if paths.is_empty() {
109 if <$rule>::DEFAULT {
110 $self.maybe_run::<$rule>(None);
116 if <$rule>::should_run($self, path) {
117 $self.maybe_run::<$rule>(Some(path));
125 impl<'a> Builder<'a> {
126 pub fn run(build: &Build) {
127 let (kind, paths) = match build.flags.cmd {
128 Subcommand::Build { ref paths } => (Kind::Build, &paths[..]),
129 Subcommand::Doc { ref paths } => (Kind::Doc, &paths[..]),
130 Subcommand::Test { ref paths, .. } => (Kind::Test, &paths[..]),
131 Subcommand::Bench { ref paths, .. } => (Kind::Bench, &paths[..]),
132 Subcommand::Dist { ref paths } => (Kind::Dist, &paths[..]),
133 Subcommand::Install { ref paths } => (Kind::Install, &paths[..]),
134 Subcommand::Clean => panic!(),
137 let builder = Builder {
139 top_stage: build.flags.stage.unwrap_or(2),
142 stack: RefCell::new(Vec::new()),
145 let builder = &builder;
147 Kind::Build => check!(builder, paths, compile::Std, compile::Test, compile::Rustc,
148 compile::StartupObjects, tool::BuildManifest, tool::Rustbook, tool::ErrorIndex,
149 tool::UnstableBookGen, tool::Tidy, tool::Linkchecker, tool::CargoTest,
150 tool::Compiletest, tool::RemoteTestServer, tool::RemoteTestClient,
151 tool::RustInstaller, tool::Cargo, tool::Rls),
152 Kind::Test => check!(builder, paths, check::Tidy, check::Bootstrap, check::Compiletest,
153 check::Krate, check::KrateLibrustc, check::Linkcheck, check::Cargotest,
154 check::Cargo, check::Docs, check::ErrorIndex, check::Distcheck),
155 Kind::Bench => check!(builder, paths, check::Krate, check::KrateLibrustc),
156 Kind::Doc => builder.default_doc(Some(paths)),
157 Kind::Dist => check!(builder, paths, dist::Docs, dist::Mingw, dist::Rustc,
158 dist::DebuggerScripts, dist::Std, dist::Analysis, dist::Src,
159 dist::PlainSourceTarball, dist::Cargo, dist::Rls, dist::Extended, dist::HashSign),
160 Kind::Install => check!(builder, paths, install::Docs, install::Std, install::Cargo,
161 install::Rls, install::Analysis, install::Src, install::Rustc),
165 pub fn default_doc(&self, paths: Option<&[PathBuf]>) {
166 let paths = paths.unwrap_or(&[]);
167 check!(self, paths, doc::UnstableBook, doc::UnstableBookGen, doc::Rustbook, doc::TheBook,
168 doc::Standalone, doc::Std, doc::Test, doc::Rustc, doc::ErrorIndex,
169 doc::Nomicon, doc::Reference);
172 /// Obtain a compiler at a given stage and for a given host. Explictly does
173 /// not take `Compiler` since all `Compiler` instances are meant to be
174 /// obtained through this function, since it ensures that they are valid
175 /// (i.e., built and assembled).
176 pub fn compiler(&'a self, stage: u32, host: &'a str) -> Compiler<'a> {
177 self.ensure(compile::Assemble { target_compiler: Compiler { stage, host } })
180 pub fn sysroot(&self, compiler: Compiler<'a>) -> PathBuf {
181 self.ensure(compile::Sysroot { compiler })
184 /// Returns the libdir where the standard library and other artifacts are
185 /// found for a compiler's sysroot.
186 pub fn sysroot_libdir(&self, compiler: Compiler<'a>, target: &'a str) -> PathBuf {
189 compiler: Compiler<'a>,
192 impl<'a> Step<'a> for Libdir<'a> {
193 type Output = PathBuf;
194 fn run(self, builder: &Builder) -> PathBuf {
195 let sysroot = builder.sysroot(self.compiler)
196 .join("lib").join("rustlib").join(self.target).join("lib");
197 let _ = fs::remove_dir_all(&sysroot);
198 t!(fs::create_dir_all(&sysroot));
202 self.ensure(Libdir { compiler, target })
205 /// Returns the compiler's libdir where it stores the dynamic libraries that
206 /// it itself links against.
208 /// For example this returns `<sysroot>/lib` on Unix and `<sysroot>/bin` on
210 pub fn rustc_libdir(&self, compiler: Compiler) -> PathBuf {
211 if compiler.is_snapshot(self) {
212 self.build.rustc_snapshot_libdir()
214 self.sysroot(compiler).join(libdir(compiler.host))
218 /// Adds the compiler's directory of dynamic libraries to `cmd`'s dynamic
219 /// library lookup path.
220 pub fn add_rustc_lib_path(&self, compiler: Compiler, cmd: &mut Command) {
221 // Windows doesn't need dylib path munging because the dlls for the
222 // compiler live next to the compiler and the system will find them
228 add_lib_path(vec![self.rustc_libdir(compiler)], cmd);
231 /// Get a path to the compiler specified.
232 pub fn rustc(&self, compiler: Compiler) -> PathBuf {
233 if compiler.is_snapshot(self) {
234 self.initial_rustc.clone()
236 self.sysroot(compiler).join("bin").join(exe("rustc", compiler.host))
240 /// Get the `rustdoc` executable next to the specified compiler
241 pub fn rustdoc(&self, compiler: Compiler) -> PathBuf {
242 let mut rustdoc = self.rustc(compiler);
244 rustdoc.push(exe("rustdoc", compiler.host));
248 /// Prepares an invocation of `cargo` to be run.
250 /// This will create a `Command` that represents a pending execution of
251 /// Cargo. This cargo will be configured to use `compiler` as the actual
252 /// rustc compiler, its output will be scoped by `mode`'s output directory,
253 /// it will pass the `--target` flag for the specified `target`, and will be
254 /// executing the Cargo command `cmd`.
259 cmd: &str) -> Command {
260 let mut cargo = Command::new(&self.initial_cargo);
261 let out_dir = self.stage_out(compiler, mode);
262 cargo.env("CARGO_TARGET_DIR", out_dir)
264 .arg("-j").arg(self.jobs().to_string())
265 .arg("--target").arg(target);
267 // FIXME: Temporary fix for https://github.com/rust-lang/cargo/issues/3005
268 // Force cargo to output binaries with disambiguating hashes in the name
269 cargo.env("__CARGO_DEFAULT_LIB_METADATA", &self.config.channel);
272 if compiler.stage == 0 && self.local_rebuild {
273 // Assume the local-rebuild rustc already has stage1 features.
276 stage = compiler.stage;
279 // Customize the compiler we're running. Specify the compiler to cargo
280 // as our shim and then pass it some various options used to configure
281 // how the actual compiler itself is called.
283 // These variables are primarily all read by
284 // src/bootstrap/bin/{rustc.rs,rustdoc.rs}
285 cargo.env("RUSTBUILD_NATIVE_DIR", self.native_dir(target))
286 .env("RUSTC", self.out.join("bootstrap/debug/rustc"))
287 .env("RUSTC_REAL", self.rustc(compiler))
288 .env("RUSTC_STAGE", stage.to_string())
289 .env("RUSTC_CODEGEN_UNITS",
290 self.config.rust_codegen_units.to_string())
291 .env("RUSTC_DEBUG_ASSERTIONS",
292 self.config.rust_debug_assertions.to_string())
293 .env("RUSTC_SYSROOT", self.sysroot(compiler))
294 .env("RUSTC_LIBDIR", self.rustc_libdir(compiler))
295 .env("RUSTC_RPATH", self.config.rust_rpath.to_string())
296 .env("RUSTDOC", self.out.join("bootstrap/debug/rustdoc"))
297 .env("RUSTDOC_REAL", self.rustdoc(compiler))
298 .env("RUSTC_FLAGS", self.rustc_flags(target).join(" "));
300 if mode != Mode::Tool {
301 // Tools don't get debuginfo right now, e.g. cargo and rls don't
302 // get compiled with debuginfo.
303 cargo.env("RUSTC_DEBUGINFO", self.config.rust_debuginfo.to_string())
304 .env("RUSTC_DEBUGINFO_LINES", self.config.rust_debuginfo_lines.to_string())
305 .env("RUSTC_FORCE_UNSTABLE", "1");
307 // Currently the compiler depends on crates from crates.io, and
308 // then other crates can depend on the compiler (e.g. proc-macro
309 // crates). Let's say, for example that rustc itself depends on the
310 // bitflags crate. If an external crate then depends on the
311 // bitflags crate as well, we need to make sure they don't
312 // conflict, even if they pick the same verison of bitflags. We'll
313 // want to make sure that e.g. a plugin and rustc each get their
314 // own copy of bitflags.
316 // Cargo ensures that this works in general through the -C metadata
317 // flag. This flag will frob the symbols in the binary to make sure
318 // they're different, even though the source code is the exact
319 // same. To solve this problem for the compiler we extend Cargo's
320 // already-passed -C metadata flag with our own. Our rustc.rs
321 // wrapper around the actual rustc will detect -C metadata being
322 // passed and frob it with this extra string we're passing in.
323 cargo.env("RUSTC_METADATA_SUFFIX", "rustc");
326 // Enable usage of unstable features
327 cargo.env("RUSTC_BOOTSTRAP", "1");
328 self.add_rust_test_threads(&mut cargo);
330 // Almost all of the crates that we compile as part of the bootstrap may
331 // have a build script, including the standard library. To compile a
332 // build script, however, it itself needs a standard library! This
333 // introduces a bit of a pickle when we're compiling the standard
336 // To work around this we actually end up using the snapshot compiler
337 // (stage0) for compiling build scripts of the standard library itself.
338 // The stage0 compiler is guaranteed to have a libstd available for use.
340 // For other crates, however, we know that we've already got a standard
341 // library up and running, so we can use the normal compiler to compile
342 // build scripts in that situation.
343 if mode == Mode::Libstd {
344 cargo.env("RUSTC_SNAPSHOT", &self.initial_rustc)
345 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_snapshot_libdir());
347 cargo.env("RUSTC_SNAPSHOT", self.rustc(compiler))
348 .env("RUSTC_SNAPSHOT_LIBDIR", self.rustc_libdir(compiler));
351 // Ignore incremental modes except for stage0, since we're
352 // not guaranteeing correctness across builds if the compiler
353 // is changing under your feet.`
354 if self.flags.incremental && compiler.stage == 0 {
355 let incr_dir = self.incremental_dir(compiler);
356 cargo.env("RUSTC_INCREMENTAL", incr_dir);
359 if let Some(ref on_fail) = self.flags.on_fail {
360 cargo.env("RUSTC_ON_FAIL", on_fail);
363 cargo.env("RUSTC_VERBOSE", format!("{}", self.verbosity));
365 // Specify some various options for build scripts used throughout
368 // FIXME: the guard against msvc shouldn't need to be here
369 if !target.contains("msvc") {
370 cargo.env(format!("CC_{}", target), self.cc(target))
371 .env(format!("AR_{}", target), self.ar(target).unwrap()) // only msvc is None
372 .env(format!("CFLAGS_{}", target), self.cflags(target).join(" "));
374 if let Ok(cxx) = self.cxx(target) {
375 cargo.env(format!("CXX_{}", target), cxx);
379 if mode == Mode::Libstd && self.config.extended && compiler.is_final_stage(self) {
380 cargo.env("RUSTC_SAVE_ANALYSIS", "api".to_string());
383 // When being built Cargo will at some point call `nmake.exe` on Windows
384 // MSVC. Unfortunately `nmake` will read these two environment variables
385 // below and try to intepret them. We're likely being run, however, from
386 // MSYS `make` which uses the same variables.
388 // As a result, to prevent confusion and errors, we remove these
389 // variables from our environment to prevent passing MSYS make flags to
390 // nmake, causing it to blow up.
391 if cfg!(target_env = "msvc") {
392 cargo.env_remove("MAKE");
393 cargo.env_remove("MAKEFLAGS");
396 // Environment variables *required* throughout the build
398 // FIXME: should update code to not require this env var
399 cargo.env("CFG_COMPILER_HOST_TRIPLE", target);
401 if self.is_verbose() {
404 // FIXME: cargo bench does not accept `--release`
405 if self.config.rust_optimize && cmd != "bench" {
406 cargo.arg("--release");
408 if self.config.locked_deps {
409 cargo.arg("--locked");
411 if self.config.vendor || self.is_sudo {
412 cargo.arg("--frozen");
415 self.ci_env.force_coloring_in_ci(&mut cargo);
420 fn maybe_run<S: Step<'a>>(&'a self, path: Option<&Path>) {
421 let build = self.build;
422 let hosts = if S::ONLY_BUILD_TARGETS || S::ONLY_BUILD {
423 &build.config.host[..1]
428 // Determine the actual targets participating in this rule.
429 // NOTE: We should keep the full projection from build triple to
430 // the hosts for the dist steps, now that the hosts array above is
431 // truncated to avoid duplication of work in that case. Therefore
432 // the original non-shadowed hosts array is used below.
433 let targets = if S::ONLY_HOSTS {
434 // If --target was specified but --host wasn't specified,
435 // don't run any host-only tests. Also, respect any `--host`
436 // overrides as done for `hosts`.
437 if build.flags.host.len() > 0 {
438 &build.flags.host[..]
439 } else if build.flags.target.len() > 0 {
441 } else if S::ONLY_BUILD {
442 &build.config.host[..1]
444 &build.config.host[..]
451 for target in targets {
452 S::make_run(self, path, host, target);
457 /// Ensure that a given step is built, returning it's output. This will
458 /// cache the step, so it is safe (and good!) to call this as often as
459 /// needed to ensure that all dependencies are built.
460 pub fn ensure<S: Step<'a>>(&'a self, step: S) -> S::Output {
461 let key = Cache::to_key(&step);
463 let mut stack = self.stack.borrow_mut();
464 if stack.contains(&key) {
465 let mut out = String::new();
466 out += &format!("\n\nCycle in build detected when adding {:?}\n", key);
467 for el in stack.iter().rev() {
468 out += &format!("\t{:?}\n", el);
472 if let Some(out) = self.cache.get::<S::Output>(&key) {
473 self.build.verbose(&format!("{}c {:?}", " ".repeat(stack.len()), key));
477 self.build.verbose(&format!("{}> {:?}", " ".repeat(stack.len()), key));
478 stack.push(key.clone());
480 let out = step.run(self);
482 let mut stack = self.stack.borrow_mut();
483 assert_eq!(stack.pop().as_ref(), Some(&key));
485 self.build.verbose(&format!("{}< {:?}", " ".repeat(self.stack.borrow().len()), key));
486 self.cache.put(key.clone(), &out);
487 self.cache.get::<S::Output>(&key).unwrap()