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 //! Sanity checking performed by rustbuild before actually executing anything.
13 //! This module contains the implementation of ensuring that the build
14 //! environment looks reasonable before progressing. This will verify that
15 //! various programs like git and python exist, along with ensuring that all C
16 //! compilers for cross-compiling are found.
18 //! In theory if we get past this phase it's a bug if a build fails, but in
19 //! practice that's likely not true!
21 use std::collections::HashMap;
23 use std::ffi::{OsString, OsStr};
25 use std::process::Command;
26 use std::path::PathBuf;
28 use build_helper::output;
33 cache: HashMap<OsString, Option<PathBuf>>,
40 cache: HashMap::new(),
41 path: env::var_os("PATH").unwrap_or_default()
45 fn maybe_have<S: AsRef<OsStr>>(&mut self, cmd: S) -> Option<PathBuf> {
46 let cmd: OsString = cmd.as_ref().into();
47 let path = self.path.clone();
48 self.cache.entry(cmd.clone()).or_insert_with(|| {
49 for path in env::split_paths(&path) {
50 let target = path.join(&cmd);
51 let mut cmd_alt = cmd.clone();
53 if target.is_file() || // some/path/git
54 target.with_extension("exe").exists() || // some/path/git.exe
55 target.join(&cmd_alt).exists() { // some/path/git/git.exe
63 fn must_have<S: AsRef<OsStr>>(&mut self, cmd: S) -> PathBuf {
64 self.maybe_have(&cmd).unwrap_or_else(|| {
65 panic!("\n\ncouldn't find required command: {:?}\n\n", cmd.as_ref());
70 pub fn check(build: &mut Build) {
71 let path = env::var_os("PATH").unwrap_or_default();
72 // On Windows, quotes are invalid characters for filename paths, and if
73 // one is present as part of the PATH then that can lead to the system
74 // being unable to identify the files properly. See
75 // https://github.com/rust-lang/rust/issues/34959 for more details.
76 if cfg!(windows) && path.to_string_lossy().contains("\"") {
77 panic!("PATH contains invalid character '\"'");
80 let mut cmd_finder = Finder::new();
81 // If we've got a git directory we're gona need git to update
82 // submodules and learn about various other aspects.
83 if build.rust_info.is_git() {
84 cmd_finder.must_have("git");
87 // We need cmake, but only if we're actually building LLVM or sanitizers.
88 let building_llvm = build.hosts.iter()
89 .filter_map(|host| build.config.target_config.get(host))
90 .any(|config| config.llvm_config.is_none());
91 if building_llvm || build.config.sanitizers {
92 cmd_finder.must_have("cmake");
95 // Ninja is currently only used for LLVM itself.
97 if build.config.ninja {
98 // Some Linux distros rename `ninja` to `ninja-build`.
99 // CMake can work with either binary name.
100 if cmd_finder.maybe_have("ninja-build").is_none() {
101 cmd_finder.must_have("ninja");
105 // If ninja isn't enabled but we're building for MSVC then we try
106 // doubly hard to enable it. It was realized in #43767 that the msbuild
107 // CMake generator for MSVC doesn't respect configuration options like
108 // disabling LLVM assertions, which can often be quite important!
110 // In these cases we automatically enable Ninja if we find it in the
112 if !build.config.ninja && build.config.build.contains("msvc") {
113 if cmd_finder.maybe_have("ninja").is_some() {
114 build.config.ninja = true;
119 build.config.python = build.config.python.take().map(|p| cmd_finder.must_have(p))
120 .or_else(|| env::var_os("BOOTSTRAP_PYTHON").map(PathBuf::from)) // set by bootstrap.py
121 .or_else(|| cmd_finder.maybe_have("python2.7"))
122 .or_else(|| cmd_finder.maybe_have("python2"))
123 .or_else(|| Some(cmd_finder.must_have("python")));
125 build.config.nodejs = build.config.nodejs.take().map(|p| cmd_finder.must_have(p))
126 .or_else(|| cmd_finder.maybe_have("node"))
127 .or_else(|| cmd_finder.maybe_have("nodejs"));
129 build.config.gdb = build.config.gdb.take().map(|p| cmd_finder.must_have(p))
130 .or_else(|| cmd_finder.maybe_have("gdb"));
132 // We're gonna build some custom C code here and there, host triples
133 // also build some C++ shims for LLVM so we need a C++ compiler.
134 for target in &build.targets {
135 // On emscripten we don't actually need the C compiler to just
136 // build the target artifacts, only for testing. For the sake
137 // of easier bot configuration, just skip detection.
138 if target.contains("emscripten") {
142 cmd_finder.must_have(build.cc(*target));
143 if let Some(ar) = build.ar(*target) {
144 cmd_finder.must_have(ar);
148 for host in &build.hosts {
149 cmd_finder.must_have(build.cxx(*host).unwrap());
151 // The msvc hosts don't use jemalloc, turn it off globally to
152 // avoid packaging the dummy liballoc_jemalloc on that platform.
153 if host.contains("msvc") {
154 build.config.use_jemalloc = false;
158 // Externally configured LLVM requires FileCheck to exist
159 let filecheck = build.llvm_filecheck(build.build);
160 if !filecheck.starts_with(&build.out) && !filecheck.exists() && build.config.codegen_tests {
161 panic!("FileCheck executable {:?} does not exist", filecheck);
164 for target in &build.targets {
165 // Can't compile for iOS unless we're on macOS
166 if target.contains("apple-ios") &&
167 !build.build.contains("apple-darwin") {
168 panic!("the iOS target is only supported on macOS");
171 // Make sure musl-root is valid
172 if target.contains("musl") && !target.contains("mips") {
173 // If this is a native target (host is also musl) and no musl-root is given,
174 // fall back to the system toolchain in /usr before giving up
175 if build.musl_root(*target).is_none() && build.config.build == *target {
176 let target = build.config.target_config.entry(target.clone())
177 .or_insert(Default::default());
178 target.musl_root = Some("/usr".into());
180 match build.musl_root(*target) {
182 if fs::metadata(root.join("lib/libc.a")).is_err() {
183 panic!("couldn't find libc.a in musl dir: {}",
184 root.join("lib").display());
186 if fs::metadata(root.join("lib/libunwind.a")).is_err() {
187 panic!("couldn't find libunwind.a in musl dir: {}",
188 root.join("lib").display());
192 panic!("when targeting MUSL either the rust.musl-root \
193 option or the target.$TARGET.musl-root option must \
194 be specified in config.toml")
199 if target.contains("msvc") {
200 // There are three builds of cmake on windows: MSVC, MinGW, and
201 // Cygwin. The Cygwin build does not have generators for Visual
202 // Studio, so detect that here and error.
203 let out = output(Command::new("cmake").arg("--help"));
204 if !out.contains("Visual Studio") {
206 cmake does not support Visual Studio generators.
208 This is likely due to it being an msys/cygwin build of cmake,
209 rather than the required windows version, built using MinGW
212 If you are building under msys2 try installing the mingw-w64-x86_64-cmake
213 package instead of cmake:
215 $ pacman -R cmake && pacman -S mingw-w64-x86_64-cmake
221 let run = |cmd: &mut Command| {
222 cmd.output().map(|output| {
223 String::from_utf8_lossy(&output.stdout)
224 .lines().next().unwrap()
228 build.lldb_version = run(Command::new("lldb").arg("--version")).ok();
229 if build.lldb_version.is_some() {
230 build.lldb_python_dir = run(Command::new("lldb").arg("-P")).ok();
233 if let Some(ref s) = build.config.ccache {
234 cmd_finder.must_have(s);