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Vendor dependencies for 0.3.0 release

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This commit is contained in:
Robert Garrett
2025-09-27 10:29:08 -05:00
parent 0c8d39d483
commit 82ab7f317b
26803 changed files with 16134934 additions and 0 deletions
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81
vendor/autocfg/src/error.rs vendored Normal file
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use std::error;
use std::fmt;
use std::io;
use std::num;
use std::process;
use std::str;
/// A common error type for the `autocfg` crate.
#[derive(Debug)]
pub struct Error {
kind: ErrorKind,
}
impl error::Error for Error {
fn description(&self) -> &str {
"AutoCfg error"
}
fn cause(&self) -> Option<&error::Error> {
match self.kind {
ErrorKind::Io(ref e) => Some(e),
ErrorKind::Num(ref e) => Some(e),
ErrorKind::Utf8(ref e) => Some(e),
ErrorKind::Process(_) | ErrorKind::Other(_) => None,
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match self.kind {
ErrorKind::Io(ref e) => e.fmt(f),
ErrorKind::Num(ref e) => e.fmt(f),
ErrorKind::Utf8(ref e) => e.fmt(f),
ErrorKind::Process(ref status) => {
// Same message as the newer `ExitStatusError`
write!(f, "process exited unsuccessfully: {}", status)
}
ErrorKind::Other(s) => s.fmt(f),
}
}
}
#[derive(Debug)]
enum ErrorKind {
Io(io::Error),
Num(num::ParseIntError),
Process(process::ExitStatus),
Utf8(str::Utf8Error),
Other(&'static str),
}
pub fn from_exit(status: process::ExitStatus) -> Error {
Error {
kind: ErrorKind::Process(status),
}
}
pub fn from_io(e: io::Error) -> Error {
Error {
kind: ErrorKind::Io(e),
}
}
pub fn from_num(e: num::ParseIntError) -> Error {
Error {
kind: ErrorKind::Num(e),
}
}
pub fn from_utf8(e: str::Utf8Error) -> Error {
Error {
kind: ErrorKind::Utf8(e),
}
}
pub fn from_str(s: &'static str) -> Error {
Error {
kind: ErrorKind::Other(s),
}
}

636
vendor/autocfg/src/lib.rs vendored Normal file
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//! A Rust library for build scripts to automatically configure code based on
//! compiler support. Code snippets are dynamically tested to see if the `rustc`
//! will accept them, rather than hard-coding specific version support.
//!
//!
//! ## Usage
//!
//! Add this to your `Cargo.toml`:
//!
//! ```toml
//! [build-dependencies]
//! autocfg = "1"
//! ```
//!
//! Then use it in your `build.rs` script to detect compiler features. For
//! example, to test for 128-bit integer support, it might look like:
//!
//! ```rust
//! extern crate autocfg;
//!
//! fn main() {
//! # // Normally, cargo will set `OUT_DIR` for build scripts.
//! # let exe = std::env::current_exe().unwrap();
//! # std::env::set_var("OUT_DIR", exe.parent().unwrap());
//! let ac = autocfg::new();
//! ac.emit_has_type("i128");
//!
//! // (optional) We don't need to rerun for anything external.
//! autocfg::rerun_path("build.rs");
//! }
//! ```
//!
//! If the type test succeeds, this will write a `cargo:rustc-cfg=has_i128` line
//! for Cargo, which translates to Rust arguments `--cfg has_i128`. Then in the
//! rest of your Rust code, you can add `#[cfg(has_i128)]` conditions on code that
//! should only be used when the compiler supports it.
//!
//! ## Caution
//!
//! Many of the probing methods of `AutoCfg` document the particular template they
//! use, **subject to change**. The inputs are not validated to make sure they are
//! semantically correct for their expected use, so it's _possible_ to escape and
//! inject something unintended. However, such abuse is unsupported and will not
//! be considered when making changes to the templates.
#![deny(missing_debug_implementations)]
#![deny(missing_docs)]
// allow future warnings that can't be fixed while keeping 1.0 compatibility
#![allow(unknown_lints)]
#![allow(bare_trait_objects)]
#![allow(ellipsis_inclusive_range_patterns)]
/// Local macro to avoid `std::try!`, deprecated in Rust 1.39.
macro_rules! try {
($result:expr) => {
match $result {
Ok(value) => value,
Err(error) => return Err(error),
}
};
}
use std::env;
use std::ffi::OsString;
use std::fmt::Arguments;
use std::fs;
use std::io::{stderr, Write};
use std::path::{Path, PathBuf};
use std::process::Stdio;
#[allow(deprecated)]
use std::sync::atomic::ATOMIC_USIZE_INIT;
use std::sync::atomic::{AtomicUsize, Ordering};
mod error;
pub use error::Error;
mod rustc;
use rustc::Rustc;
mod version;
use version::Version;
#[cfg(test)]
mod tests;
/// Helper to detect compiler features for `cfg` output in build scripts.
#[derive(Clone, Debug)]
pub struct AutoCfg {
out_dir: PathBuf,
rustc: Rustc,
rustc_version: Version,
target: Option<OsString>,
no_std: bool,
edition: Option<String>,
rustflags: Vec<String>,
uuid: u64,
}
/// Writes a config flag for rustc on standard out.
///
/// This looks like: `cargo:rustc-cfg=CFG`
///
/// Cargo will use this in arguments to rustc, like `--cfg CFG`.
///
/// This does not automatically call [`emit_possibility`]
/// so the compiler my generate an [`unexpected_cfgs` warning][check-cfg-flags].
/// However, all the builtin emit methods on [`AutoCfg`] call [`emit_possibility`] automatically.
///
/// [check-cfg-flags]: https://blog.rust-lang.org/2024/05/06/check-cfg.html
pub fn emit(cfg: &str) {
println!("cargo:rustc-cfg={}", cfg);
}
/// Writes a line telling Cargo to rerun the build script if `path` changes.
///
/// This looks like: `cargo:rerun-if-changed=PATH`
///
/// This requires at least cargo 0.7.0, corresponding to rustc 1.6.0. Earlier
/// versions of cargo will simply ignore the directive.
pub fn rerun_path(path: &str) {
println!("cargo:rerun-if-changed={}", path);
}
/// Writes a line telling Cargo to rerun the build script if the environment
/// variable `var` changes.
///
/// This looks like: `cargo:rerun-if-env-changed=VAR`
///
/// This requires at least cargo 0.21.0, corresponding to rustc 1.20.0. Earlier
/// versions of cargo will simply ignore the directive.
pub fn rerun_env(var: &str) {
println!("cargo:rerun-if-env-changed={}", var);
}
/// Indicates to rustc that a config flag should not generate an [`unexpected_cfgs` warning][check-cfg-flags]
///
/// This looks like `cargo:rustc-check-cfg=cfg(VAR)`
///
/// As of rust 1.80, the compiler does [automatic checking of cfgs at compile time][check-cfg-flags].
/// All custom configuration flags must be known to rustc, or they will generate a warning.
/// This is done automatically when calling the builtin emit methods on [`AutoCfg`],
/// but not when calling [`autocfg::emit`](crate::emit) directly.
///
/// Versions before rust 1.80 will simply ignore this directive.
///
/// This function indicates to the compiler that the config flag never has a value.
/// If this is not desired, see [the blog post][check-cfg].
///
/// [check-cfg-flags]: https://blog.rust-lang.org/2024/05/06/check-cfg.html
pub fn emit_possibility(cfg: &str) {
println!("cargo:rustc-check-cfg=cfg({})", cfg);
}
/// Creates a new `AutoCfg` instance.
///
/// # Panics
///
/// Panics if `AutoCfg::new()` returns an error.
pub fn new() -> AutoCfg {
AutoCfg::new().unwrap()
}
impl AutoCfg {
/// Creates a new `AutoCfg` instance.
///
/// # Common errors
///
/// - `rustc` can't be executed, from `RUSTC` or in the `PATH`.
/// - The version output from `rustc` can't be parsed.
/// - `OUT_DIR` is not set in the environment, or is not a writable directory.
///
pub fn new() -> Result<Self, Error> {
match env::var_os("OUT_DIR") {
Some(d) => Self::with_dir(d),
None => Err(error::from_str("no OUT_DIR specified!")),
}
}
/// Creates a new `AutoCfg` instance with the specified output directory.
///
/// # Common errors
///
/// - `rustc` can't be executed, from `RUSTC` or in the `PATH`.
/// - The version output from `rustc` can't be parsed.
/// - `dir` is not a writable directory.
///
pub fn with_dir<T: Into<PathBuf>>(dir: T) -> Result<Self, Error> {
let rustc = Rustc::new();
let rustc_version = try!(rustc.version());
let target = env::var_os("TARGET");
// Sanity check the output directory
let dir = dir.into();
let meta = try!(fs::metadata(&dir).map_err(error::from_io));
if !meta.is_dir() || meta.permissions().readonly() {
return Err(error::from_str("output path is not a writable directory"));
}
let mut ac = AutoCfg {
rustflags: rustflags(&target, &dir),
out_dir: dir,
rustc: rustc,
rustc_version: rustc_version,
target: target,
no_std: false,
edition: None,
uuid: new_uuid(),
};
// Sanity check with and without `std`.
if ac.probe_raw("").is_err() {
if ac.probe_raw("#![no_std]").is_ok() {
ac.no_std = true;
} else {
// Neither worked, so assume nothing...
let warning = b"warning: autocfg could not probe for `std`\n";
stderr().write_all(warning).ok();
}
}
Ok(ac)
}
/// Returns whether `AutoCfg` is using `#![no_std]` in its probes.
///
/// This is automatically detected during construction -- if an empty probe
/// fails while one with `#![no_std]` succeeds, then the attribute will be
/// used for all further probes. This is usually only necessary when the
/// `TARGET` lacks `std` altogether. If neither succeeds, `no_std` is not
/// set, but that `AutoCfg` will probably only work for version checks.
///
/// This attribute changes the implicit [prelude] from `std` to `core`,
/// which may affect the paths you need to use in other probes. It also
/// restricts some types that otherwise get additional methods in `std`,
/// like floating-point trigonometry and slice sorting.
///
/// See also [`set_no_std`](#method.set_no_std).
///
/// [prelude]: https://doc.rust-lang.org/reference/names/preludes.html#the-no_std-attribute
pub fn no_std(&self) -> bool {
self.no_std
}
/// Sets whether `AutoCfg` should use `#![no_std]` in its probes.
///
/// See also [`no_std`](#method.no_std).
pub fn set_no_std(&mut self, no_std: bool) {
self.no_std = no_std;
}
/// Returns the `--edition` string that is currently being passed to `rustc`, if any,
/// as configured by the [`set_edition`][Self::set_edition] method.
pub fn edition(&self) -> Option<&str> {
match self.edition {
Some(ref edition) => Some(&**edition),
None => None,
}
}
/// Sets the `--edition` string that will be passed to `rustc`,
/// or `None` to leave the compiler at its default edition.
///
/// See also [The Rust Edition Guide](https://doc.rust-lang.org/edition-guide/).
///
/// **Warning:** Setting an unsupported edition will likely cause **all** subsequent probes to
/// fail! As of this writing, the known editions and their minimum Rust versions are:
///
/// | Edition | Version |
/// | ------- | ---------- |
/// | 2015 | 1.27.0[^1] |
/// | 2018 | 1.31.0 |
/// | 2021 | 1.56.0 |
/// | 2024 | 1.85.0 |
///
/// [^1]: Prior to 1.27.0, Rust was effectively 2015 Edition by default, but the concept hadn't
/// been established yet, so the explicit `--edition` flag wasn't supported either.
pub fn set_edition(&mut self, edition: Option<String>) {
self.edition = edition;
}
/// Tests whether the current `rustc` reports a version greater than
/// or equal to "`major`.`minor`".
pub fn probe_rustc_version(&self, major: usize, minor: usize) -> bool {
self.rustc_version >= Version::new(major, minor, 0)
}
/// Sets a `cfg` value of the form `rustc_major_minor`, like `rustc_1_29`,
/// if the current `rustc` is at least that version.
pub fn emit_rustc_version(&self, major: usize, minor: usize) {
let cfg_flag = format!("rustc_{}_{}", major, minor);
emit_possibility(&cfg_flag);
if self.probe_rustc_version(major, minor) {
emit(&cfg_flag);
}
}
/// Returns a new (hopefully unique) crate name for probes.
fn new_crate_name(&self) -> String {
#[allow(deprecated)]
static ID: AtomicUsize = ATOMIC_USIZE_INIT;
let id = ID.fetch_add(1, Ordering::Relaxed);
format!("autocfg_{:016x}_{}", self.uuid, id)
}
fn probe_fmt<'a>(&self, source: Arguments<'a>) -> Result<(), Error> {
let crate_name = self.new_crate_name();
let mut command = self.rustc.command();
command
.arg("--crate-name")
.arg(&crate_name)
.arg("--crate-type=lib")
.arg("--out-dir")
.arg(&self.out_dir)
.arg("--emit=llvm-ir");
if let Some(edition) = self.edition.as_ref() {
command.arg("--edition").arg(edition);
}
if let Some(target) = self.target.as_ref() {
command.arg("--target").arg(target);
}
command.args(&self.rustflags);
command.arg("-").stdin(Stdio::piped());
let mut child = try!(command.spawn().map_err(error::from_io));
let mut stdin = child.stdin.take().expect("rustc stdin");
try!(stdin.write_fmt(source).map_err(error::from_io));
drop(stdin);
match child.wait() {
Ok(status) if status.success() => {
// Try to remove the output file so it doesn't look like a build product for
// systems like bazel -- but this is best-effort, so we can ignore failure.
// The probe itself is already considered successful at this point.
let mut file = self.out_dir.join(crate_name);
file.set_extension("ll");
let _ = fs::remove_file(file);
Ok(())
}
Ok(status) => Err(error::from_exit(status)),
Err(error) => Err(error::from_io(error)),
}
}
fn probe<'a>(&self, code: Arguments<'a>) -> bool {
let result = if self.no_std {
self.probe_fmt(format_args!("#![no_std]\n{}", code))
} else {
self.probe_fmt(code)
};
result.is_ok()
}
/// Tests whether the given code can be compiled as a Rust library.
///
/// This will only return `Ok` if the compiler ran and exited successfully,
/// per `ExitStatus::success()`.
/// The code is passed to the compiler exactly as-is, notably not even
/// adding the [`#![no_std]`][Self::no_std] attribute like other probes.
///
/// Raw probes are useful for testing functionality that's not yet covered
/// by the rest of the `AutoCfg` API. For example, the following attribute
/// **must** be used at the crate level, so it wouldn't work within the code
/// templates used by other `probe_*` methods.
///
/// ```
/// # extern crate autocfg;
/// # // Normally, cargo will set `OUT_DIR` for build scripts.
/// # let exe = std::env::current_exe().unwrap();
/// # std::env::set_var("OUT_DIR", exe.parent().unwrap());
/// let ac = autocfg::new();
/// assert!(ac.probe_raw("#![no_builtins]").is_ok());
/// ```
///
/// Rust nightly features could be tested as well -- ideally including a
/// code sample to ensure the unstable feature still works as expected.
/// For example, `slice::group_by` was renamed to `chunk_by` when it was
/// stabilized, even though the feature name was unchanged, so testing the
/// `#![feature(..)]` alone wouldn't reveal that. For larger snippets,
/// [`include_str!`] may be useful to load them from separate files.
///
/// ```
/// # extern crate autocfg;
/// # // Normally, cargo will set `OUT_DIR` for build scripts.
/// # let exe = std::env::current_exe().unwrap();
/// # std::env::set_var("OUT_DIR", exe.parent().unwrap());
/// let ac = autocfg::new();
/// let code = r#"
/// #![feature(slice_group_by)]
/// pub fn probe(slice: &[i32]) -> impl Iterator<Item = &[i32]> {
/// slice.group_by(|a, b| a == b)
/// }
/// "#;
/// if ac.probe_raw(code).is_ok() {
/// autocfg::emit("has_slice_group_by");
/// }
/// ```
pub fn probe_raw(&self, code: &str) -> Result<(), Error> {
self.probe_fmt(format_args!("{}", code))
}
/// Tests whether the given sysroot crate can be used.
///
/// The test code is subject to change, but currently looks like:
///
/// ```ignore
/// extern crate CRATE as probe;
/// ```
pub fn probe_sysroot_crate(&self, name: &str) -> bool {
// Note: `as _` wasn't stabilized until Rust 1.33
self.probe(format_args!("extern crate {} as probe;", name))
}
/// Emits a config value `has_CRATE` if `probe_sysroot_crate` returns true.
pub fn emit_sysroot_crate(&self, name: &str) {
let cfg_flag = format!("has_{}", mangle(name));
emit_possibility(&cfg_flag);
if self.probe_sysroot_crate(name) {
emit(&cfg_flag);
}
}
/// Tests whether the given path can be used.
///
/// The test code is subject to change, but currently looks like:
///
/// ```ignore
/// pub use PATH;
/// ```
pub fn probe_path(&self, path: &str) -> bool {
self.probe(format_args!("pub use {};", path))
}
/// Emits a config value `has_PATH` if `probe_path` returns true.
///
/// Any non-identifier characters in the `path` will be replaced with
/// `_` in the generated config value.
pub fn emit_has_path(&self, path: &str) {
self.emit_path_cfg(path, &format!("has_{}", mangle(path)));
}
/// Emits the given `cfg` value if `probe_path` returns true.
pub fn emit_path_cfg(&self, path: &str, cfg: &str) {
emit_possibility(cfg);
if self.probe_path(path) {
emit(cfg);
}
}
/// Tests whether the given trait can be used.
///
/// The test code is subject to change, but currently looks like:
///
/// ```ignore
/// pub trait Probe: TRAIT + Sized {}
/// ```
pub fn probe_trait(&self, name: &str) -> bool {
self.probe(format_args!("pub trait Probe: {} + Sized {{}}", name))
}
/// Emits a config value `has_TRAIT` if `probe_trait` returns true.
///
/// Any non-identifier characters in the trait `name` will be replaced with
/// `_` in the generated config value.
pub fn emit_has_trait(&self, name: &str) {
self.emit_trait_cfg(name, &format!("has_{}", mangle(name)));
}
/// Emits the given `cfg` value if `probe_trait` returns true.
pub fn emit_trait_cfg(&self, name: &str, cfg: &str) {
emit_possibility(cfg);
if self.probe_trait(name) {
emit(cfg);
}
}
/// Tests whether the given type can be used.
///
/// The test code is subject to change, but currently looks like:
///
/// ```ignore
/// pub type Probe = TYPE;
/// ```
pub fn probe_type(&self, name: &str) -> bool {
self.probe(format_args!("pub type Probe = {};", name))
}
/// Emits a config value `has_TYPE` if `probe_type` returns true.
///
/// Any non-identifier characters in the type `name` will be replaced with
/// `_` in the generated config value.
pub fn emit_has_type(&self, name: &str) {
self.emit_type_cfg(name, &format!("has_{}", mangle(name)));
}
/// Emits the given `cfg` value if `probe_type` returns true.
pub fn emit_type_cfg(&self, name: &str, cfg: &str) {
emit_possibility(cfg);
if self.probe_type(name) {
emit(cfg);
}
}
/// Tests whether the given expression can be used.
///
/// The test code is subject to change, but currently looks like:
///
/// ```ignore
/// pub fn probe() { let _ = EXPR; }
/// ```
pub fn probe_expression(&self, expr: &str) -> bool {
self.probe(format_args!("pub fn probe() {{ let _ = {}; }}", expr))
}
/// Emits the given `cfg` value if `probe_expression` returns true.
pub fn emit_expression_cfg(&self, expr: &str, cfg: &str) {
emit_possibility(cfg);
if self.probe_expression(expr) {
emit(cfg);
}
}
/// Tests whether the given constant expression can be used.
///
/// The test code is subject to change, but currently looks like:
///
/// ```ignore
/// pub const PROBE: () = ((), EXPR).0;
/// ```
pub fn probe_constant(&self, expr: &str) -> bool {
self.probe(format_args!("pub const PROBE: () = ((), {}).0;", expr))
}
/// Emits the given `cfg` value if `probe_constant` returns true.
pub fn emit_constant_cfg(&self, expr: &str, cfg: &str) {
emit_possibility(cfg);
if self.probe_constant(expr) {
emit(cfg);
}
}
}
fn mangle(s: &str) -> String {
s.chars()
.map(|c| match c {
'A'...'Z' | 'a'...'z' | '0'...'9' => c,
_ => '_',
})
.collect()
}
fn dir_contains_target(
target: &Option<OsString>,
dir: &Path,
cargo_target_dir: Option<OsString>,
) -> bool {
target
.as_ref()
.and_then(|target| {
dir.to_str().and_then(|dir| {
let mut cargo_target_dir = cargo_target_dir
.map(PathBuf::from)
.unwrap_or_else(|| PathBuf::from("target"));
cargo_target_dir.push(target);
cargo_target_dir
.to_str()
.map(|cargo_target_dir| dir.contains(cargo_target_dir))
})
})
.unwrap_or(false)
}
fn rustflags(target: &Option<OsString>, dir: &Path) -> Vec<String> {
// Starting with rust-lang/cargo#9601, shipped in Rust 1.55, Cargo always sets
// CARGO_ENCODED_RUSTFLAGS for any host/target build script invocation. This
// includes any source of flags, whether from the environment, toml config, or
// whatever may come in the future. The value is either an empty string, or a
// list of arguments separated by the ASCII unit separator (US), 0x1f.
if let Ok(a) = env::var("CARGO_ENCODED_RUSTFLAGS") {
return if a.is_empty() {
Vec::new()
} else {
a.split('\x1f').map(str::to_string).collect()
};
}
// Otherwise, we have to take a more heuristic approach, and we don't
// support values from toml config at all.
//
// Cargo only applies RUSTFLAGS for building TARGET artifact in
// cross-compilation environment. Sadly, we don't have a way to detect
// when we're building HOST artifact in a cross-compilation environment,
// so for now we only apply RUSTFLAGS when cross-compiling an artifact.
//
// See https://github.com/cuviper/autocfg/pull/10#issuecomment-527575030.
if *target != env::var_os("HOST")
|| dir_contains_target(target, dir, env::var_os("CARGO_TARGET_DIR"))
{
if let Ok(rustflags) = env::var("RUSTFLAGS") {
// This is meant to match how cargo handles the RUSTFLAGS environment variable.
// See https://github.com/rust-lang/cargo/blob/69aea5b6f69add7c51cca939a79644080c0b0ba0/src/cargo/core/compiler/build_context/target_info.rs#L434-L441
return rustflags
.split(' ')
.map(str::trim)
.filter(|s| !s.is_empty())
.map(str::to_string)
.collect();
}
}
Vec::new()
}
/// Generates a numeric ID to use in probe crate names.
///
/// This attempts to be random, within the constraints of Rust 1.0 and no dependencies.
fn new_uuid() -> u64 {
const FNV_OFFSET_BASIS: u64 = 0xcbf2_9ce4_8422_2325;
const FNV_PRIME: u64 = 0x100_0000_01b3;
// This set should have an actual random hasher.
let set: std::collections::HashSet<u64> = (0..256).collect();
// Feed the `HashSet`-shuffled order into FNV-1a.
let mut hash: u64 = FNV_OFFSET_BASIS;
for x in set {
hash = (hash ^ x).wrapping_mul(FNV_PRIME);
}
hash
}

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use std::env;
use std::ffi::OsString;
use std::path::PathBuf;
use std::process::Command;
use super::error::Error;
use super::version::Version;
#[derive(Clone, Debug)]
pub struct Rustc {
rustc: PathBuf,
rustc_wrapper: Option<PathBuf>,
rustc_workspace_wrapper: Option<PathBuf>,
}
impl Rustc {
pub fn new() -> Self {
Rustc {
rustc: env::var_os("RUSTC")
.unwrap_or_else(|| "rustc".into())
.into(),
rustc_wrapper: get_rustc_wrapper(false),
rustc_workspace_wrapper: get_rustc_wrapper(true),
}
}
/// Build the command with possible wrappers.
pub fn command(&self) -> Command {
let mut rustc = self
.rustc_wrapper
.iter()
.chain(self.rustc_workspace_wrapper.iter())
.chain(Some(&self.rustc));
let mut command = Command::new(rustc.next().unwrap());
for arg in rustc {
command.arg(arg);
}
command
}
/// Try to get the `rustc` version.
pub fn version(&self) -> Result<Version, Error> {
// Some wrappers like clippy-driver don't pass through version commands,
// so we try to fall back to combinations without each wrapper.
macro_rules! try_version {
($command:expr) => {
if let Ok(value) = Version::from_command($command) {
return Ok(value);
}
};
}
let rustc = &self.rustc;
if let Some(ref rw) = self.rustc_wrapper {
if let Some(ref rww) = self.rustc_workspace_wrapper {
try_version!(Command::new(rw).args(&[rww, rustc]));
}
try_version!(Command::new(rw).arg(rustc));
}
if let Some(ref rww) = self.rustc_workspace_wrapper {
try_version!(Command::new(rww).arg(rustc));
}
Version::from_command(&mut Command::new(rustc))
}
}
fn get_rustc_wrapper(workspace: bool) -> Option<PathBuf> {
// We didn't really know whether the workspace wrapper is applicable until Cargo started
// deliberately setting or unsetting it in rust-lang/cargo#9601. We'll use the encoded
// rustflags as a proxy for that change for now, but we could instead check version 1.55.
if workspace && env::var_os("CARGO_ENCODED_RUSTFLAGS").is_none() {
return None;
}
let name = if workspace {
"RUSTC_WORKSPACE_WRAPPER"
} else {
"RUSTC_WRAPPER"
};
if let Some(wrapper) = env::var_os(name) {
// NB: `OsStr` didn't get `len` or `is_empty` until 1.9.
if wrapper != OsString::new() {
return Some(wrapper.into());
}
}
None
}

54
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use std::path::Path;
#[test]
fn version_cmp() {
use super::version::Version;
let v123 = Version::new(1, 2, 3);
assert!(Version::new(1, 0, 0) < v123);
assert!(Version::new(1, 2, 2) < v123);
assert!(Version::new(1, 2, 3) == v123);
assert!(Version::new(1, 2, 4) > v123);
assert!(Version::new(1, 10, 0) > v123);
assert!(Version::new(2, 0, 0) > v123);
}
#[test]
fn dir_does_not_contain_target() {
assert!(!super::dir_contains_target(
&Some("x86_64-unknown-linux-gnu".into()),
Path::new("/project/target/debug/build/project-ea75983148559682/out"),
None,
));
}
#[test]
fn dir_does_contain_target() {
assert!(super::dir_contains_target(
&Some("x86_64-unknown-linux-gnu".into()),
Path::new(
"/project/target/x86_64-unknown-linux-gnu/debug/build/project-0147aca016480b9d/out"
),
None,
));
}
#[test]
fn dir_does_not_contain_target_with_custom_target_dir() {
assert!(!super::dir_contains_target(
&Some("x86_64-unknown-linux-gnu".into()),
Path::new("/project/custom/debug/build/project-ea75983148559682/out"),
Some("custom".into()),
));
}
#[test]
fn dir_does_contain_target_with_custom_target_dir() {
assert!(super::dir_contains_target(
&Some("x86_64-unknown-linux-gnu".into()),
Path::new(
"/project/custom/x86_64-unknown-linux-gnu/debug/build/project-0147aca016480b9d/out"
),
Some("custom".into()),
));
}

65
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use std::process::Command;
use std::str;
use super::{error, Error};
/// A version structure for making relative comparisons.
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
pub struct Version {
major: usize,
minor: usize,
patch: usize,
}
impl Version {
/// Creates a `Version` instance for a specific `major.minor.patch` version.
pub fn new(major: usize, minor: usize, patch: usize) -> Self {
Version {
major: major,
minor: minor,
patch: patch,
}
}
pub fn from_command(command: &mut Command) -> Result<Self, Error> {
// Get rustc's verbose version
let output = try!(command
.args(&["--version", "--verbose"])
.output()
.map_err(error::from_io));
if !output.status.success() {
return Err(error::from_str("could not execute rustc"));
}
let output = try!(str::from_utf8(&output.stdout).map_err(error::from_utf8));
// Find the release line in the verbose version output.
let release = match output.lines().find(|line| line.starts_with("release: ")) {
Some(line) => &line["release: ".len()..],
None => return Err(error::from_str("could not find rustc release")),
};
// Strip off any extra channel info, e.g. "-beta.N", "-nightly"
let version = match release.find('-') {
Some(i) => &release[..i],
None => release,
};
// Split the version into semver components.
let mut iter = version.splitn(3, '.');
let major = try!(iter
.next()
.ok_or_else(|| error::from_str("missing major version")));
let minor = try!(iter
.next()
.ok_or_else(|| error::from_str("missing minor version")));
let patch = try!(iter
.next()
.ok_or_else(|| error::from_str("missing patch version")));
Ok(Version::new(
try!(major.parse().map_err(error::from_num)),
try!(minor.parse().map_err(error::from_num)),
try!(patch.parse().map_err(error::from_num)),
))
}
}