1 //! Sanity checking performed by rustbuild before actually executing anything.
3 //! This module contains the implementation of ensuring that the build
4 //! environment looks reasonable before progressing. This will verify that
5 //! various programs like git and python exist, along with ensuring that all C
6 //! compilers for cross-compiling are found.
8 //! In theory if we get past this phase it's a bug if a build fails, but in
9 //! practice that's likely not true!
11 use std::collections::HashMap;
13 use std::ffi::{OsStr, OsString};
15 use std::path::PathBuf;
16 use std::process::Command;
18 use crate::cache::INTERNER;
19 use crate::config::Target;
20 use crate::util::output;
24 cache: HashMap<OsString, Option<PathBuf>>,
29 pub fn new() -> Self {
30 Self { cache: HashMap::new(), path: env::var_os("PATH").unwrap_or_default() }
33 pub fn maybe_have<S: Into<OsString>>(&mut self, cmd: S) -> Option<PathBuf> {
34 let cmd: OsString = cmd.into();
35 let path = &self.path;
39 for path in env::split_paths(path) {
40 let target = path.join(&cmd);
41 let mut cmd_exe = cmd.clone();
44 if target.is_file() // some/path/git
45 || path.join(&cmd_exe).exists() // some/path/git.exe
46 || target.join(&cmd_exe).exists()
47 // some/path/git/git.exe
57 pub fn must_have<S: AsRef<OsStr>>(&mut self, cmd: S) -> PathBuf {
58 self.maybe_have(&cmd).unwrap_or_else(|| {
59 panic!("\n\ncouldn't find required command: {:?}\n\n", cmd.as_ref());
64 pub fn check(build: &mut Build) {
65 let path = env::var_os("PATH").unwrap_or_default();
66 // On Windows, quotes are invalid characters for filename paths, and if
67 // one is present as part of the PATH then that can lead to the system
68 // being unable to identify the files properly. See
69 // https://github.com/rust-lang/rust/issues/34959 for more details.
70 if cfg!(windows) && path.to_string_lossy().contains('\"') {
71 panic!("PATH contains invalid character '\"'");
74 let mut cmd_finder = Finder::new();
75 // If we've got a git directory we're gonna need git to update
76 // submodules and learn about various other aspects.
77 if build.rust_info.is_git() {
78 cmd_finder.must_have("git");
81 // We need cmake, but only if we're actually building LLVM or sanitizers.
82 let building_llvm = build.config.rust_codegen_backends.contains(&INTERNER.intern_str("llvm"))
91 .map(|config| config.llvm_config.is_none())
94 .any(|build_llvm_ourselves| build_llvm_ourselves);
95 let need_cmake = building_llvm || build.config.any_sanitizers_enabled();
97 cmd_finder.must_have("cmake");
100 build.config.python = build
104 .map(|p| cmd_finder.must_have(p))
105 .or_else(|| env::var_os("BOOTSTRAP_PYTHON").map(PathBuf::from)) // set by bootstrap.py
106 .or_else(|| cmd_finder.maybe_have("python"))
107 .or_else(|| cmd_finder.maybe_have("python3"))
108 .or_else(|| cmd_finder.maybe_have("python2"));
110 build.config.nodejs = build
114 .map(|p| cmd_finder.must_have(p))
115 .or_else(|| cmd_finder.maybe_have("node"))
116 .or_else(|| cmd_finder.maybe_have("nodejs"));
118 build.config.npm = build
122 .map(|p| cmd_finder.must_have(p))
123 .or_else(|| cmd_finder.maybe_have("npm"));
125 build.config.gdb = build
129 .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 // We don't use a C compiler on wasm32
143 if target.contains("wasm32") {
147 if !build.config.dry_run {
148 cmd_finder.must_have(build.cc(*target));
149 if let Some(ar) = build.ar(*target) {
150 cmd_finder.must_have(ar);
155 for host in &build.hosts {
156 if !build.config.dry_run {
157 cmd_finder.must_have(build.cxx(*host).unwrap());
161 if build.config.rust_codegen_backends.contains(&INTERNER.intern_str("llvm")) {
162 // Externally configured LLVM requires FileCheck to exist
163 let filecheck = build.llvm_filecheck(build.build);
164 if !filecheck.starts_with(&build.out) && !filecheck.exists() && build.config.codegen_tests {
165 panic!("FileCheck executable {:?} does not exist", filecheck);
169 for target in &build.targets {
174 .or_insert_with(|| Target::from_triple(&target.triple));
176 if target.contains("-none-") || target.contains("nvptx") {
177 if build.no_std(*target) == Some(false) {
178 panic!("All the *-none-* and nvptx* targets are no-std targets")
182 // Make sure musl-root is valid
183 if target.contains("musl") {
184 // If this is a native target (host is also musl) and no musl-root is given,
185 // fall back to the system toolchain in /usr before giving up
186 if build.musl_root(*target).is_none() && build.config.build == *target {
187 let target = build.config.target_config.entry(*target).or_default();
188 target.musl_root = Some("/usr".into());
190 match build.musl_libdir(*target) {
192 if fs::metadata(libdir.join("libc.a")).is_err() {
193 panic!("couldn't find libc.a in musl libdir: {}", libdir.display());
197 "when targeting MUSL either the rust.musl-root \
198 option or the target.$TARGET.musl-root option must \
199 be specified in config.toml"
204 if need_cmake && target.contains("msvc") {
205 // There are three builds of cmake on windows: MSVC, MinGW, and
206 // Cygwin. The Cygwin build does not have generators for Visual
207 // Studio, so detect that here and error.
208 let out = output(Command::new("cmake").arg("--help"));
209 if !out.contains("Visual Studio") {
212 cmake does not support Visual Studio generators.
214 This is likely due to it being an msys/cygwin build of cmake,
215 rather than the required windows version, built using MinGW
218 If you are building under msys2 try installing the mingw-w64-x86_64-cmake
219 package instead of cmake:
221 $ pacman -R cmake && pacman -S mingw-w64-x86_64-cmake
228 if let Some(ref s) = build.config.ccache {
229 cmd_finder.must_have(s);