chore: add vendor dependencies for kauma build

vendor/cc/src/command_helpers.rs

@@ -0,0 +1,491 @@
+//! Miscellaneous helpers for running commands
+
+use std::{
+    collections::hash_map,
+    ffi::OsString,
+    fmt::Display,
+    fs,
+    hash::Hasher,
+    io::{self, Read, Write},
+    path::Path,
+    process::{Child, ChildStderr, Command, Stdio},
+    sync::{
+        atomic::{AtomicBool, Ordering},
+        Arc,
+    },
+};
+
+use crate::{Error, ErrorKind, Object};
+
+#[derive(Clone, Debug)]
+pub(crate) struct CargoOutput {
+    pub(crate) metadata: bool,
+    pub(crate) warnings: bool,
+    pub(crate) debug: bool,
+    pub(crate) output: OutputKind,
+    checked_dbg_var: Arc<AtomicBool>,
+}
+
+/// Different strategies for handling compiler output (to stdout)
+#[derive(Clone, Debug)]
+pub(crate) enum OutputKind {
+    /// Forward the output to this process' stdout ([`Stdio::inherit()`])
+    Forward,
+    /// Discard the output ([`Stdio::null()`])
+    Discard,
+    /// Capture the result (`[Stdio::piped()`])
+    Capture,
+}
+
+impl CargoOutput {
+    pub(crate) fn new() -> Self {
+        #[allow(clippy::disallowed_methods)]
+        Self {
+            metadata: true,
+            warnings: true,
+            output: OutputKind::Forward,
+            debug: match std::env::var_os("CC_ENABLE_DEBUG_OUTPUT") {
+                Some(v) => v != "0" && v != "false" && v != "",
+                None => false,
+            },
+            checked_dbg_var: Arc::new(AtomicBool::new(false)),
+        }
+    }
+
+    pub(crate) fn print_metadata(&self, s: &dyn Display) {
+        if self.metadata {
+            println!("{}", s);
+        }
+    }
+
+    pub(crate) fn print_warning(&self, arg: &dyn Display) {
+        if self.warnings {
+            println!("cargo:warning={}", arg);
+        }
+    }
+
+    pub(crate) fn print_debug(&self, arg: &dyn Display) {
+        if self.metadata && !self.checked_dbg_var.load(Ordering::Relaxed) {
+            self.checked_dbg_var.store(true, Ordering::Relaxed);
+            println!("cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT");
+        }
+        if self.debug {
+            println!("{}", arg);
+        }
+    }
+
+    fn stdio_for_warnings(&self) -> Stdio {
+        if self.warnings {
+            Stdio::piped()
+        } else {
+            Stdio::null()
+        }
+    }
+
+    fn stdio_for_output(&self) -> Stdio {
+        match self.output {
+            OutputKind::Capture => Stdio::piped(),
+            OutputKind::Forward => Stdio::inherit(),
+            OutputKind::Discard => Stdio::null(),
+        }
+    }
+}
+
+pub(crate) struct StderrForwarder {
+    inner: Option<(ChildStderr, Vec<u8>)>,
+    #[cfg(feature = "parallel")]
+    is_non_blocking: bool,
+    #[cfg(feature = "parallel")]
+    bytes_available_failed: bool,
+    /// number of bytes buffered in inner
+    bytes_buffered: usize,
+}
+
+const MIN_BUFFER_CAPACITY: usize = 100;
+
+impl StderrForwarder {
+    pub(crate) fn new(child: &mut Child) -> Self {
+        Self {
+            inner: child
+                .stderr
+                .take()
+                .map(|stderr| (stderr, Vec::with_capacity(MIN_BUFFER_CAPACITY))),
+            bytes_buffered: 0,
+            #[cfg(feature = "parallel")]
+            is_non_blocking: false,
+            #[cfg(feature = "parallel")]
+            bytes_available_failed: false,
+        }
+    }
+
+    fn forward_available(&mut self) -> bool {
+        if let Some((stderr, buffer)) = self.inner.as_mut() {
+            loop {
+                // For non-blocking we check to see if there is data available, so we should try to
+                // read at least that much. For blocking, always read at least the minimum amount.
+                #[cfg(not(feature = "parallel"))]
+                let to_reserve = MIN_BUFFER_CAPACITY;
+                #[cfg(feature = "parallel")]
+                let to_reserve = if self.is_non_blocking && !self.bytes_available_failed {
+                    match crate::parallel::stderr::bytes_available(stderr) {
+                        #[cfg(windows)]
+                        Ok(0) => break false,
+                        #[cfg(unix)]
+                        Ok(0) => {
+                            // On Unix, depending on the implementation, we may sometimes get 0 in a
+                            // loop (either there is data available or the pipe is broken), so
+                            // continue with the non-blocking read anyway.
+                            MIN_BUFFER_CAPACITY
+                        }
+                        #[cfg(windows)]
+                        Err(_) => {
+                            // On Windows, if we get an error then the pipe is broken, so flush
+                            // the buffer and bail.
+                            if !buffer.is_empty() {
+                                write_warning(&buffer[..]);
+                            }
+                            self.inner = None;
+                            break true;
+                        }
+                        #[cfg(unix)]
+                        Err(_) => {
+                            // On Unix, depending on the implementation, we may get spurious
+                            // errors so make a note not to use bytes_available again and try
+                            // the non-blocking read anyway.
+                            self.bytes_available_failed = true;
+                            MIN_BUFFER_CAPACITY
+                        }
+                        #[cfg(target_family = "wasm")]
+                        Err(_) => panic!("bytes_available should always succeed on wasm"),
+                        Ok(bytes_available) => MIN_BUFFER_CAPACITY.max(bytes_available),
+                    }
+                } else {
+                    MIN_BUFFER_CAPACITY
+                };
+                if self.bytes_buffered + to_reserve > buffer.len() {
+                    buffer.resize(self.bytes_buffered + to_reserve, 0);
+                }
+
+                match stderr.read(&mut buffer[self.bytes_buffered..]) {
+                    Err(err) if err.kind() == std::io::ErrorKind::WouldBlock => {
+                        // No data currently, yield back.
+                        break false;
+                    }
+                    Err(err) if err.kind() == std::io::ErrorKind::Interrupted => {
+                        // Interrupted, try again.
+                        continue;
+                    }
+                    Ok(bytes_read) if bytes_read != 0 => {
+                        self.bytes_buffered += bytes_read;
+                        let mut consumed = 0;
+                        for line in buffer[..self.bytes_buffered].split_inclusive(|&b| b == b'\n') {
+                            // Only forward complete lines, leave the rest in the buffer.
+                            if let Some((b'\n', line)) = line.split_last() {
+                                consumed += line.len() + 1;
+                                write_warning(line);
+                            }
+                        }
+                        if consumed > 0 && consumed < self.bytes_buffered {
+                            // Remove the consumed bytes from buffer
+                            buffer.copy_within(consumed.., 0);
+                        }
+                        self.bytes_buffered -= consumed;
+                    }
+                    res => {
+                        // End of stream: flush remaining data and bail.
+                        if self.bytes_buffered > 0 {
+                            write_warning(&buffer[..self.bytes_buffered]);
+                        }
+                        if let Err(err) = res {
+                            write_warning(
+                                format!("Failed to read from child stderr: {err}").as_bytes(),
+                            );
+                        }
+                        self.inner.take();
+                        break true;
+                    }
+                }
+            }
+        } else {
+            true
+        }
+    }
+
+    #[cfg(feature = "parallel")]
+    pub(crate) fn set_non_blocking(&mut self) -> Result<(), Error> {
+        assert!(!self.is_non_blocking);
+
+        #[cfg(unix)]
+        if let Some((stderr, _)) = self.inner.as_ref() {
+            crate::parallel::stderr::set_non_blocking(stderr)?;
+        }
+
+        self.is_non_blocking = true;
+        Ok(())
+    }
+
+    #[cfg(feature = "parallel")]
+    fn forward_all(&mut self) {
+        while !self.forward_available() {}
+    }
+
+    #[cfg(not(feature = "parallel"))]
+    fn forward_all(&mut self) {
+        let forward_result = self.forward_available();
+        assert!(forward_result, "Should have consumed all data");
+    }
+}
+
+fn write_warning(line: &[u8]) {
+    let stdout = io::stdout();
+    let mut stdout = stdout.lock();
+    stdout.write_all(b"cargo:warning=").unwrap();
+    stdout.write_all(line).unwrap();
+    stdout.write_all(b"\n").unwrap();
+}
+
+fn wait_on_child(
+    cmd: &Command,
+    program: &Path,
+    child: &mut Child,
+    cargo_output: &CargoOutput,
+) -> Result<(), Error> {
+    StderrForwarder::new(child).forward_all();
+
+    let status = match child.wait() {
+        Ok(s) => s,
+        Err(e) => {
+            return Err(Error::new(
+                ErrorKind::ToolExecError,
+                format!(
+                    "Failed to wait on spawned child process, command {:?} with args {}: {}.",
+                    cmd,
+                    program.display(),
+                    e
+                ),
+            ));
+        }
+    };
+
+    cargo_output.print_debug(&status);
+
+    if status.success() {
+        Ok(())
+    } else {
+        Err(Error::new(
+            ErrorKind::ToolExecError,
+            format!(
+                "Command {:?} with args {} did not execute successfully (status code {}).",
+                cmd,
+                program.display(),
+                status
+            ),
+        ))
+    }
+}
+
+/// Find the destination object path for each file in the input source files,
+/// and store them in the output Object.
+pub(crate) fn objects_from_files(files: &[Arc<Path>], dst: &Path) -> Result<Vec<Object>, Error> {
+    let mut objects = Vec::with_capacity(files.len());
+    for file in files {
+        let basename = file
+            .file_name()
+            .ok_or_else(|| {
+                Error::new(
+                    ErrorKind::InvalidArgument,
+                    "No file_name for object file path!",
+                )
+            })?
+            .to_string_lossy();
+        let dirname = file
+            .parent()
+            .ok_or_else(|| {
+                Error::new(
+                    ErrorKind::InvalidArgument,
+                    "No parent for object file path!",
+                )
+            })?
+            .to_string_lossy();
+
+        // Hash the dirname. This should prevent conflicts if we have multiple
+        // object files with the same filename in different subfolders.
+        let mut hasher = hash_map::DefaultHasher::new();
+        hasher.write(dirname.to_string().as_bytes());
+        let obj = dst
+            .join(format!("{:016x}-{}", hasher.finish(), basename))
+            .with_extension("o");
+
+        match obj.parent() {
+            Some(s) => fs::create_dir_all(s)?,
+            None => {
+                return Err(Error::new(
+                    ErrorKind::InvalidArgument,
+                    "dst is an invalid path with no parent",
+                ));
+            }
+        };
+
+        objects.push(Object::new(file.to_path_buf(), obj));
+    }
+
+    Ok(objects)
+}
+
+pub(crate) fn run(
+    cmd: &mut Command,
+    program: impl AsRef<Path>,
+    cargo_output: &CargoOutput,
+) -> Result<(), Error> {
+    let program = program.as_ref();
+
+    let mut child = spawn(cmd, program, cargo_output)?;
+    wait_on_child(cmd, program, &mut child, cargo_output)
+}
+
+pub(crate) fn run_output(
+    cmd: &mut Command,
+    program: impl AsRef<Path>,
+    cargo_output: &CargoOutput,
+) -> Result<Vec<u8>, Error> {
+    let program = program.as_ref();
+
+    // We specifically need the output to be captured, so override default
+    let mut captured_cargo_output = cargo_output.clone();
+    captured_cargo_output.output = OutputKind::Capture;
+    let mut child = spawn(cmd, program, &captured_cargo_output)?;
+
+    let mut stdout = vec![];
+    child
+        .stdout
+        .take()
+        .unwrap()
+        .read_to_end(&mut stdout)
+        .unwrap();
+
+    // Don't care about this output, use the normal settings
+    wait_on_child(cmd, program, &mut child, cargo_output)?;
+
+    Ok(stdout)
+}
+
+pub(crate) fn spawn(
+    cmd: &mut Command,
+    program: &Path,
+    cargo_output: &CargoOutput,
+) -> Result<Child, Error> {
+    struct ResetStderr<'cmd>(&'cmd mut Command);
+
+    impl Drop for ResetStderr<'_> {
+        fn drop(&mut self) {
+            // Reset stderr to default to release pipe_writer so that print thread will
+            // not block forever.
+            self.0.stderr(Stdio::inherit());
+        }
+    }
+
+    cargo_output.print_debug(&format_args!("running: {:?}", cmd));
+
+    let cmd = ResetStderr(cmd);
+    let child = cmd
+        .0
+        .stderr(cargo_output.stdio_for_warnings())
+        .stdout(cargo_output.stdio_for_output())
+        .spawn();
+    match child {
+        Ok(child) => Ok(child),
+        Err(ref e) if e.kind() == io::ErrorKind::NotFound => {
+            let extra = if cfg!(windows) {
+                " (see https://docs.rs/cc/latest/cc/#compile-time-requirements \
+for help)"
+            } else {
+                ""
+            };
+            Err(Error::new(
+                ErrorKind::ToolNotFound,
+                format!(
+                    "Failed to find tool. Is `{}` installed?{}",
+                    program.display(),
+                    extra
+                ),
+            ))
+        }
+        Err(e) => Err(Error::new(
+            ErrorKind::ToolExecError,
+            format!(
+                "Command {:?} with args {} failed to start: {:?}",
+                cmd.0,
+                program.display(),
+                e
+            ),
+        )),
+    }
+}
+
+pub(crate) struct CmdAddOutputFileArgs {
+    pub(crate) cuda: bool,
+    pub(crate) is_assembler_msvc: bool,
+    pub(crate) msvc: bool,
+    pub(crate) clang: bool,
+    pub(crate) gnu: bool,
+    pub(crate) is_asm: bool,
+    pub(crate) is_arm: bool,
+}
+
+pub(crate) fn command_add_output_file(cmd: &mut Command, dst: &Path, args: CmdAddOutputFileArgs) {
+    if args.is_assembler_msvc
+        || !(!args.msvc || args.clang || args.gnu || args.cuda || (args.is_asm && args.is_arm))
+    {
+        let mut s = OsString::from("-Fo");
+        s.push(dst);
+        cmd.arg(s);
+    } else {
+        cmd.arg("-o").arg(dst);
+    }
+}
+
+#[cfg(feature = "parallel")]
+pub(crate) fn try_wait_on_child(
+    cmd: &Command,
+    program: &Path,
+    child: &mut Child,
+    stdout: &mut dyn io::Write,
+    stderr_forwarder: &mut StderrForwarder,
+) -> Result<Option<()>, Error> {
+    stderr_forwarder.forward_available();
+
+    match child.try_wait() {
+        Ok(Some(status)) => {
+            stderr_forwarder.forward_all();
+
+            let _ = writeln!(stdout, "{}", status);
+
+            if status.success() {
+                Ok(Some(()))
+            } else {
+                Err(Error::new(
+                    ErrorKind::ToolExecError,
+                    format!(
+                        "Command {:?} with args {} did not execute successfully (status code {}).",
+                        cmd,
+                        program.display(),
+                        status
+                    ),
+                ))
+            }
+        }
+        Ok(None) => Ok(None),
+        Err(e) => {
+            stderr_forwarder.forward_all();
+            Err(Error::new(
+                ErrorKind::ToolExecError,
+                format!(
+                    "Failed to wait on spawned child process, command {:?} with args {}: {}.",
+                    cmd,
+                    program.display(),
+                    e
+                ),
+            ))
+        }
+    }
+}

vendor/cc/src/detect_compiler_family.c

@@ -0,0 +1,15 @@
+#ifdef __clang__
+#pragma message "clang"
+#endif
+
+#ifdef __GNUC__
+#pragma message "gcc"
+#endif
+
+#ifdef __EMSCRIPTEN__
+#pragma message "emscripten"
+#endif
+
+#ifdef __VXWORKS__
+#pragma message "VxWorks"
+#endif

vendor/cc/src/parallel/async_executor.rs

@@ -0,0 +1,118 @@
+use std::{
+    cell::Cell,
+    future::Future,
+    pin::Pin,
+    ptr,
+    task::{Context, Poll, RawWaker, RawWakerVTable, Waker},
+    thread,
+    time::Duration,
+};
+
+use crate::Error;
+
+const NOOP_WAKER_VTABLE: RawWakerVTable = RawWakerVTable::new(
+    // Cloning just returns a new no-op raw waker
+    |_| NOOP_RAW_WAKER,
+    // `wake` does nothing
+    |_| {},
+    // `wake_by_ref` does nothing
+    |_| {},
+    // Dropping does nothing as we don't allocate anything
+    |_| {},
+);
+const NOOP_RAW_WAKER: RawWaker = RawWaker::new(ptr::null(), &NOOP_WAKER_VTABLE);
+
+#[derive(Default)]
+pub(crate) struct YieldOnce(bool);
+
+impl Future for YieldOnce {
+    type Output = ();
+
+    fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<()> {
+        let flag = &mut std::pin::Pin::into_inner(self).0;
+        if !*flag {
+            *flag = true;
+            Poll::Pending
+        } else {
+            Poll::Ready(())
+        }
+    }
+}
+
+/// Execute the futures and return when they are all done.
+///
+/// Here we use our own homebrew async executor since cc is used in the build
+/// script of many popular projects, pulling in additional dependencies would
+/// significantly slow down its compilation.
+pub(crate) fn block_on<Fut1, Fut2>(
+    mut fut1: Fut1,
+    mut fut2: Fut2,
+    has_made_progress: &Cell<bool>,
+) -> Result<(), Error>
+where
+    Fut1: Future<Output = Result<(), Error>>,
+    Fut2: Future<Output = Result<(), Error>>,
+{
+    // Shadows the future so that it can never be moved and is guaranteed
+    // to be pinned.
+    //
+    // The same trick used in `pin!` macro.
+    //
+    // TODO: Once MSRV is bumped to 1.68, replace this with `std::pin::pin!`
+    let mut fut1 = Some(unsafe { Pin::new_unchecked(&mut fut1) });
+    let mut fut2 = Some(unsafe { Pin::new_unchecked(&mut fut2) });
+
+    // TODO: Once `Waker::noop` stablised and our MSRV is bumped to the version
+    // which it is stablised, replace this with `Waker::noop`.
+    let waker = unsafe { Waker::from_raw(NOOP_RAW_WAKER) };
+    let mut context = Context::from_waker(&waker);
+
+    let mut backoff_cnt = 0;
+
+    loop {
+        has_made_progress.set(false);
+
+        if let Some(fut) = fut2.as_mut() {
+            if let Poll::Ready(res) = fut.as_mut().poll(&mut context) {
+                fut2 = None;
+                res?;
+            }
+        }
+
+        if let Some(fut) = fut1.as_mut() {
+            if let Poll::Ready(res) = fut.as_mut().poll(&mut context) {
+                fut1 = None;
+                res?;
+            }
+        }
+
+        if fut1.is_none() && fut2.is_none() {
+            return Ok(());
+        }
+
+        if !has_made_progress.get() {
+            if backoff_cnt > 3 {
+                // We have yielded at least three times without making'
+                // any progress, so we will sleep for a while.
+                let duration = Duration::from_millis(100 * (backoff_cnt - 3).min(10));
+                thread::sleep(duration);
+            } else {
+                // Given that we spawned a lot of compilation tasks, it is unlikely
+                // that OS cannot find other ready task to execute.
+                //
+                // If all of them are done, then we will yield them and spawn more,
+                // or simply return.
+                //
+                // Thus this will not be turned into a busy-wait loop and it will not
+                // waste CPU resource.
+                thread::yield_now();
+            }
+        }
+
+        backoff_cnt = if has_made_progress.get() {
+            0
+        } else {
+            backoff_cnt + 1
+        };
+    }
+}

vendor/cc/src/parallel/job_token.rs

@@ -0,0 +1,273 @@
+use std::marker::PhantomData;
+
+use crate::Error;
+
+use super::once_lock::OnceLock;
+
+pub(crate) struct JobToken(PhantomData<()>);
+
+impl JobToken {
+    fn new() -> Self {
+        Self(PhantomData)
+    }
+}
+
+impl Drop for JobToken {
+    fn drop(&mut self) {
+        match JobTokenServer::new() {
+            JobTokenServer::Inherited(jobserver) => jobserver.release_token_raw(),
+            JobTokenServer::InProcess(jobserver) => jobserver.release_token_raw(),
+        }
+    }
+}
+
+enum JobTokenServer {
+    Inherited(inherited_jobserver::JobServer),
+    InProcess(inprocess_jobserver::JobServer),
+}
+
+impl JobTokenServer {
+    /// This function returns a static reference to the jobserver because
+    ///  - creating a jobserver from env is a bit fd-unsafe (e.g. the fd might
+    ///    be closed by other jobserver users in the process) and better do it
+    ///    at the start of the program.
+    ///  - in case a jobserver cannot be created from env (e.g. it's not
+    ///    present), we will create a global in-process only jobserver
+    ///    that has to be static so that it will be shared by all cc
+    ///    compilation.
+    fn new() -> &'static Self {
+        // TODO: Replace with a OnceLock once MSRV is 1.70
+        static JOBSERVER: OnceLock<JobTokenServer> = OnceLock::new();
+
+        JOBSERVER.get_or_init(|| {
+            unsafe { inherited_jobserver::JobServer::from_env() }
+                .map(Self::Inherited)
+                .unwrap_or_else(|| Self::InProcess(inprocess_jobserver::JobServer::new()))
+        })
+    }
+}
+
+pub(crate) enum ActiveJobTokenServer {
+    Inherited(inherited_jobserver::ActiveJobServer<'static>),
+    InProcess(&'static inprocess_jobserver::JobServer),
+}
+
+impl ActiveJobTokenServer {
+    pub(crate) fn new() -> Self {
+        match JobTokenServer::new() {
+            JobTokenServer::Inherited(inherited_jobserver) => {
+                Self::Inherited(inherited_jobserver.enter_active())
+            }
+            JobTokenServer::InProcess(inprocess_jobserver) => Self::InProcess(inprocess_jobserver),
+        }
+    }
+
+    pub(crate) async fn acquire(&mut self) -> Result<JobToken, Error> {
+        match self {
+            Self::Inherited(jobserver) => jobserver.acquire().await,
+            Self::InProcess(jobserver) => Ok(jobserver.acquire().await),
+        }
+    }
+}
+
+mod inherited_jobserver {
+    use super::JobToken;
+
+    use crate::{parallel::async_executor::YieldOnce, Error, ErrorKind};
+
+    use std::{
+        io, mem,
+        sync::{mpsc, Mutex, MutexGuard, PoisonError},
+    };
+
+    pub(super) struct JobServer {
+        /// Implicit token for this process which is obtained and will be
+        /// released in parent. Since JobTokens only give back what they got,
+        /// there should be at most one global implicit token in the wild.
+        ///
+        /// Since Rust does not execute any `Drop` for global variables,
+        /// we can't just put it back to jobserver and then re-acquire it at
+        /// the end of the process.
+        ///
+        /// Use `Mutex` to avoid race between acquire and release.
+        /// If an `AtomicBool` is used, then it's possible for:
+        ///  - `release_token_raw`: Tries to set `global_implicit_token` to true, but it is already
+        ///    set  to `true`, continue to release it to jobserver
+        ///  - `acquire` takes the global implicit token, set `global_implicit_token` to false
+        ///  - `release_token_raw` now writes the token back into the jobserver, while
+        ///    `global_implicit_token` is `false`
+        ///
+        /// If the program exits here, then cc effectively increases parallelism by one, which is
+        /// incorrect, hence we use a `Mutex` here.
+        global_implicit_token: Mutex<bool>,
+        inner: jobserver::Client,
+    }
+
+    impl JobServer {
+        pub(super) unsafe fn from_env() -> Option<Self> {
+            jobserver::Client::from_env().map(|inner| Self {
+                inner,
+                global_implicit_token: Mutex::new(true),
+            })
+        }
+
+        fn get_global_implicit_token(&self) -> MutexGuard<'_, bool> {
+            self.global_implicit_token
+                .lock()
+                .unwrap_or_else(PoisonError::into_inner)
+        }
+
+        /// All tokens except for the global implicit token will be put back into the jobserver
+        /// immediately and they cannot be cached, since Rust does not call `Drop::drop` on
+        /// global variables.
+        pub(super) fn release_token_raw(&self) {
+            let mut global_implicit_token = self.get_global_implicit_token();
+
+            if *global_implicit_token {
+                // There's already a global implicit token, so this token must
+                // be released back into jobserver.
+                //
+                // `release_raw` should not block
+                let _ = self.inner.release_raw();
+            } else {
+                *global_implicit_token = true;
+            }
+        }
+
+        pub(super) fn enter_active(&self) -> ActiveJobServer<'_> {
+            ActiveJobServer {
+                jobserver: self,
+                helper_thread: None,
+            }
+        }
+    }
+
+    struct HelperThread {
+        inner: jobserver::HelperThread,
+        /// When rx is dropped, all the token stored within it will be dropped.
+        rx: mpsc::Receiver<io::Result<jobserver::Acquired>>,
+    }
+
+    impl HelperThread {
+        fn new(jobserver: &JobServer) -> Result<Self, Error> {
+            let (tx, rx) = mpsc::channel();
+
+            Ok(Self {
+                rx,
+                inner: jobserver.inner.clone().into_helper_thread(move |res| {
+                    let _ = tx.send(res);
+                })?,
+            })
+        }
+    }
+
+    pub(crate) struct ActiveJobServer<'a> {
+        jobserver: &'a JobServer,
+        helper_thread: Option<HelperThread>,
+    }
+
+    impl<'a> ActiveJobServer<'a> {
+        pub(super) async fn acquire(&mut self) -> Result<JobToken, Error> {
+            let mut has_requested_token = false;
+
+            loop {
+                // Fast path
+                if mem::replace(&mut *self.jobserver.get_global_implicit_token(), false) {
+                    break Ok(JobToken::new());
+                }
+
+                match self.jobserver.inner.try_acquire() {
+                    Ok(Some(acquired)) => {
+                        acquired.drop_without_releasing();
+                        break Ok(JobToken::new());
+                    }
+                    Ok(None) => YieldOnce::default().await,
+                    Err(err) if err.kind() == io::ErrorKind::Unsupported => {
+                        // Fallback to creating a help thread with blocking acquire
+                        let helper_thread = if let Some(thread) = self.helper_thread.as_ref() {
+                            thread
+                        } else {
+                            self.helper_thread
+                                .insert(HelperThread::new(self.jobserver)?)
+                        };
+
+                        match helper_thread.rx.try_recv() {
+                            Ok(res) => {
+                                let acquired = res?;
+                                acquired.drop_without_releasing();
+                                break Ok(JobToken::new());
+                            }
+                            Err(mpsc::TryRecvError::Disconnected) => break Err(Error::new(
+                                ErrorKind::JobserverHelpThreadError,
+                                "jobserver help thread has returned before ActiveJobServer is dropped",
+                            )),
+                            Err(mpsc::TryRecvError::Empty) => {
+                                if !has_requested_token {
+                                    helper_thread.inner.request_token();
+                                    has_requested_token = true;
+                                }
+                                YieldOnce::default().await
+                            }
+                        }
+                    }
+                    Err(err) => break Err(err.into()),
+                }
+            }
+        }
+    }
+}
+
+mod inprocess_jobserver {
+    use super::JobToken;
+
+    use crate::parallel::async_executor::YieldOnce;
+
+    use std::{
+        env::var,
+        sync::atomic::{
+            AtomicU32,
+            Ordering::{AcqRel, Acquire},
+        },
+    };
+
+    pub(crate) struct JobServer(AtomicU32);
+
+    impl JobServer {
+        pub(super) fn new() -> Self {
+            // Use `NUM_JOBS` if set (it's configured by Cargo) and otherwise
+            // just fall back to a semi-reasonable number.
+            //
+            // Note that we could use `num_cpus` here but it's an extra
+            // dependency that will almost never be used, so
+            // it's generally not too worth it.
+            let mut parallelism = 4;
+            // TODO: Use std::thread::available_parallelism as an upper bound
+            // when MSRV is bumped.
+            if let Ok(amt) = var("NUM_JOBS") {
+                if let Ok(amt) = amt.parse() {
+                    parallelism = amt;
+                }
+            }
+
+            Self(AtomicU32::new(parallelism))
+        }
+
+        pub(super) async fn acquire(&self) -> JobToken {
+            loop {
+                let res = self
+                    .0
+                    .fetch_update(AcqRel, Acquire, |tokens| tokens.checked_sub(1));
+
+                if res.is_ok() {
+                    break JobToken::new();
+                }
+
+                YieldOnce::default().await
+            }
+        }
+
+        pub(super) fn release_token_raw(&self) {
+            self.0.fetch_add(1, AcqRel);
+        }
+    }
+}

vendor/cc/src/parallel/mod.rs

@@ -0,0 +1,4 @@
+pub(crate) mod async_executor;
+pub(crate) mod job_token;
+pub(crate) mod once_lock;
+pub(crate) mod stderr;

vendor/cc/src/parallel/once_lock.rs

@@ -0,0 +1,47 @@
+use std::{
+    cell::UnsafeCell,
+    marker::PhantomData,
+    mem::MaybeUninit,
+    panic::{RefUnwindSafe, UnwindSafe},
+    sync::Once,
+};
+
+pub(crate) struct OnceLock<T> {
+    once: Once,
+    value: UnsafeCell<MaybeUninit<T>>,
+    _marker: PhantomData<T>,
+}
+
+impl<T> OnceLock<T> {
+    pub(crate) const fn new() -> Self {
+        Self {
+            once: Once::new(),
+            value: UnsafeCell::new(MaybeUninit::uninit()),
+            _marker: PhantomData,
+        }
+    }
+
+    pub(crate) fn get_or_init(&self, f: impl FnOnce() -> T) -> &T {
+        self.once.call_once(|| {
+            unsafe { &mut *self.value.get() }.write(f());
+        });
+        unsafe { (&*self.value.get()).assume_init_ref() }
+    }
+}
+
+unsafe impl<T: Sync + Send> Sync for OnceLock<T> {}
+unsafe impl<T: Send> Send for OnceLock<T> {}
+
+impl<T: RefUnwindSafe + UnwindSafe> RefUnwindSafe for OnceLock<T> {}
+impl<T: UnwindSafe> UnwindSafe for OnceLock<T> {}
+
+impl<T> Drop for OnceLock<T> {
+    #[inline]
+    fn drop(&mut self) {
+        if self.once.is_completed() {
+            // SAFETY: The cell is initialized and being dropped, so it can't
+            // be accessed again.
+            unsafe { self.value.get_mut().assume_init_drop() };
+        }
+    }
+}

vendor/cc/src/parallel/stderr.rs

@@ -0,0 +1,91 @@
+#![cfg_attr(target_family = "wasm", allow(unused))]
+/// Helpers functions for [ChildStderr].
+use std::{convert::TryInto, process::ChildStderr};
+
+use crate::{Error, ErrorKind};
+
+#[cfg(all(not(unix), not(windows), not(target_family = "wasm")))]
+compile_error!("Only unix and windows support non-blocking pipes! For other OSes, disable the parallel feature.");
+
+#[cfg(unix)]
+fn get_flags(fd: std::os::unix::io::RawFd) -> Result<i32, Error> {
+    let flags = unsafe { libc::fcntl(fd, libc::F_GETFL, 0) };
+    if flags == -1 {
+        Err(Error::new(
+            ErrorKind::IOError,
+            format!(
+                "Failed to get flags for pipe {}: {}",
+                fd,
+                std::io::Error::last_os_error()
+            ),
+        ))
+    } else {
+        Ok(flags)
+    }
+}
+
+#[cfg(unix)]
+fn set_flags(fd: std::os::unix::io::RawFd, flags: std::os::raw::c_int) -> Result<(), Error> {
+    if unsafe { libc::fcntl(fd, libc::F_SETFL, flags) } == -1 {
+        Err(Error::new(
+            ErrorKind::IOError,
+            format!(
+                "Failed to set flags for pipe {}: {}",
+                fd,
+                std::io::Error::last_os_error()
+            ),
+        ))
+    } else {
+        Ok(())
+    }
+}
+
+#[cfg(unix)]
+pub fn set_non_blocking(pipe: &impl std::os::unix::io::AsRawFd) -> Result<(), Error> {
+    // On Unix, switch the pipe to non-blocking mode.
+    // On Windows, we have a different way to be non-blocking.
+    let fd = pipe.as_raw_fd();
+
+    let flags = get_flags(fd)?;
+    set_flags(fd, flags | libc::O_NONBLOCK)
+}
+
+pub fn bytes_available(stderr: &mut ChildStderr) -> Result<usize, Error> {
+    let mut bytes_available = 0;
+    #[cfg(windows)]
+    {
+        use crate::windows::windows_sys::PeekNamedPipe;
+        use std::os::windows::io::AsRawHandle;
+        use std::ptr::null_mut;
+        if unsafe {
+            PeekNamedPipe(
+                stderr.as_raw_handle(),
+                null_mut(),
+                0,
+                null_mut(),
+                &mut bytes_available,
+                null_mut(),
+            )
+        } == 0
+        {
+            return Err(Error::new(
+                ErrorKind::IOError,
+                format!(
+                    "PeekNamedPipe failed with {}",
+                    std::io::Error::last_os_error()
+                ),
+            ));
+        }
+    }
+    #[cfg(unix)]
+    {
+        use std::os::unix::io::AsRawFd;
+        if unsafe { libc::ioctl(stderr.as_raw_fd(), libc::FIONREAD, &mut bytes_available) } != 0 {
+            return Err(Error::new(
+                ErrorKind::IOError,
+                format!("ioctl failed with {}", std::io::Error::last_os_error()),
+            ));
+        }
+    }
+    Ok(bytes_available.try_into().unwrap())
+}

vendor/cc/src/target_info.rs

@@ -0,0 +1,29 @@
+//! This file is generated code. Please edit the generator
+//! in dev-tools/gen-target-info if you need to make changes.
+
+pub const RISCV_ARCH_MAPPING: &[(&str, &str)] = &[
+    ("riscv32e", "riscv32"),
+    ("riscv32em", "riscv32"),
+    ("riscv32emc", "riscv32"),
+    ("riscv32gc", "riscv32"),
+    ("riscv32i", "riscv32"),
+    ("riscv32im", "riscv32"),
+    ("riscv32ima", "riscv32"),
+    ("riscv32imac", "riscv32"),
+    ("riscv32imafc", "riscv32"),
+    ("riscv32imc", "riscv32"),
+    ("riscv64gc", "riscv64"),
+    ("riscv64imac", "riscv64"),
+];
+pub const WINDOWS_TRIPLE_MAPPING: &[(&str, &str)] = &[
+    ("aarch64-pc-windows-gnullvm", "aarch64-pc-windows-gnu"),
+    ("aarch64-uwp-windows-msvc", "aarch64-pc-windows-msvc"),
+    ("i686-pc-windows-gnullvm", "i686-pc-windows-gnu"),
+    ("i686-uwp-windows-gnu", "i686-pc-windows-gnu"),
+    ("i686-uwp-windows-msvc", "i686-pc-windows-msvc"),
+    ("i686-win7-windows-msvc", "i686-pc-windows-msvc"),
+    ("thumbv7a-uwp-windows-msvc", "thumbv7a-pc-windows-msvc"),
+    ("x86_64-pc-windows-gnullvm", "x86_64-pc-windows-gnu"),
+    ("x86_64-uwp-windows-gnu", "x86_64-pc-windows-gnu"),
+    ("x86_64-uwp-windows-msvc", "x86_64-pc-windows-msvc"),
+];

vendor/cc/src/tempfile.rs

@@ -0,0 +1,86 @@
+#![cfg_attr(target_family = "wasm", allow(unused))]
+
+use std::{
+    collections::hash_map::RandomState,
+    fs::{remove_file, File, OpenOptions},
+    hash::{BuildHasher, Hasher},
+    io, os,
+    path::{Path, PathBuf},
+};
+
+#[cfg(not(any(unix, target_family = "wasm", windows)))]
+compile_error!("Your system is not supported since cc cannot create named tempfile");
+
+fn rand() -> u64 {
+    RandomState::new().build_hasher().finish()
+}
+
+fn tmpname(suffix: &str) -> String {
+    format!("{}{}", rand(), suffix)
+}
+
+fn create_named(path: &Path) -> io::Result<File> {
+    let mut open_options = OpenOptions::new();
+
+    open_options.read(true).write(true).create_new(true);
+
+    #[cfg(all(unix, not(target_os = "wasi")))]
+    <OpenOptions as os::unix::fs::OpenOptionsExt>::mode(&mut open_options, 0o600);
+
+    #[cfg(windows)]
+    <OpenOptions as os::windows::fs::OpenOptionsExt>::custom_flags(
+        &mut open_options,
+        crate::windows::windows_sys::FILE_ATTRIBUTE_TEMPORARY,
+    );
+
+    open_options.open(path)
+}
+
+pub(super) struct NamedTempfile {
+    path: PathBuf,
+    file: Option<File>,
+}
+
+impl NamedTempfile {
+    pub(super) fn new(base: &Path, suffix: &str) -> io::Result<Self> {
+        for _ in 0..10 {
+            let path = base.join(tmpname(suffix));
+            match create_named(&path) {
+                Ok(file) => {
+                    return Ok(Self {
+                        file: Some(file),
+                        path,
+                    })
+                }
+                Err(e) if e.kind() == io::ErrorKind::AlreadyExists => continue,
+                Err(e) => return Err(e),
+            };
+        }
+
+        Err(io::Error::new(
+            io::ErrorKind::AlreadyExists,
+            format!(
+                "too many temporary files exist in base `{}` with suffix `{}`",
+                base.display(),
+                suffix
+            ),
+        ))
+    }
+
+    pub(super) fn path(&self) -> &Path {
+        &self.path
+    }
+
+    pub(super) fn take_file(&mut self) -> Option<File> {
+        self.file.take()
+    }
+}
+
+impl Drop for NamedTempfile {
+    fn drop(&mut self) {
+        // On Windows you have to close all handle to it before
+        // removing the file.
+        self.file.take();
+        let _ = remove_file(&self.path);
+    }
+}

vendor/cc/src/tool.rs

@@ -0,0 +1,476 @@
+use std::{
+    borrow::Cow,
+    collections::HashMap,
+    env,
+    ffi::{OsStr, OsString},
+    io::Write,
+    path::{Path, PathBuf},
+    process::Command,
+    sync::RwLock,
+};
+
+use crate::{
+    command_helpers::{run_output, CargoOutput},
+    run,
+    tempfile::NamedTempfile,
+    Error, ErrorKind, OutputKind,
+};
+
+/// Configuration used to represent an invocation of a C compiler.
+///
+/// This can be used to figure out what compiler is in use, what the arguments
+/// to it are, and what the environment variables look like for the compiler.
+/// This can be used to further configure other build systems (e.g. forward
+/// along CC and/or CFLAGS) or the `to_command` method can be used to run the
+/// compiler itself.
+#[derive(Clone, Debug)]
+#[allow(missing_docs)]
+pub struct Tool {
+    pub(crate) path: PathBuf,
+    pub(crate) cc_wrapper_path: Option<PathBuf>,
+    pub(crate) cc_wrapper_args: Vec<OsString>,
+    pub(crate) args: Vec<OsString>,
+    pub(crate) env: Vec<(OsString, OsString)>,
+    pub(crate) family: ToolFamily,
+    pub(crate) cuda: bool,
+    pub(crate) removed_args: Vec<OsString>,
+    pub(crate) has_internal_target_arg: bool,
+}
+
+impl Tool {
+    pub(crate) fn new(
+        path: PathBuf,
+        cached_compiler_family: &RwLock<HashMap<Box<Path>, ToolFamily>>,
+        cargo_output: &CargoOutput,
+        out_dir: Option<&Path>,
+    ) -> Self {
+        Self::with_features(
+            path,
+            None,
+            false,
+            cached_compiler_family,
+            cargo_output,
+            out_dir,
+        )
+    }
+
+    pub(crate) fn with_clang_driver(
+        path: PathBuf,
+        clang_driver: Option<&str>,
+        cached_compiler_family: &RwLock<HashMap<Box<Path>, ToolFamily>>,
+        cargo_output: &CargoOutput,
+        out_dir: Option<&Path>,
+    ) -> Self {
+        Self::with_features(
+            path,
+            clang_driver,
+            false,
+            cached_compiler_family,
+            cargo_output,
+            out_dir,
+        )
+    }
+
+    /// Explicitly set the `ToolFamily`, skipping name-based detection.
+    pub(crate) fn with_family(path: PathBuf, family: ToolFamily) -> Self {
+        Self {
+            path,
+            cc_wrapper_path: None,
+            cc_wrapper_args: Vec::new(),
+            args: Vec::new(),
+            env: Vec::new(),
+            family,
+            cuda: false,
+            removed_args: Vec::new(),
+            has_internal_target_arg: false,
+        }
+    }
+
+    pub(crate) fn with_features(
+        path: PathBuf,
+        clang_driver: Option<&str>,
+        cuda: bool,
+        cached_compiler_family: &RwLock<HashMap<Box<Path>, ToolFamily>>,
+        cargo_output: &CargoOutput,
+        out_dir: Option<&Path>,
+    ) -> Self {
+        fn is_zig_cc(path: &Path, cargo_output: &CargoOutput) -> bool {
+            run_output(
+                Command::new(path).arg("--version"),
+                path,
+                // tool detection issues should always be shown as warnings
+                cargo_output,
+            )
+            .map(|o| String::from_utf8_lossy(&o).contains("ziglang"))
+            .unwrap_or_default()
+        }
+
+        fn detect_family_inner(
+            path: &Path,
+            cargo_output: &CargoOutput,
+            out_dir: Option<&Path>,
+        ) -> Result<ToolFamily, Error> {
+            let out_dir = out_dir
+                .map(Cow::Borrowed)
+                .unwrap_or_else(|| Cow::Owned(env::temp_dir()));
+
+            // Ensure all the parent directories exist otherwise temp file creation
+            // will fail
+            std::fs::create_dir_all(&out_dir).map_err(|err| Error {
+                kind: ErrorKind::IOError,
+                message: format!("failed to create OUT_DIR '{}': {}", out_dir.display(), err)
+                    .into(),
+            })?;
+
+            let mut tmp =
+                NamedTempfile::new(&out_dir, "detect_compiler_family.c").map_err(|err| Error {
+                    kind: ErrorKind::IOError,
+                    message: format!(
+                        "failed to create detect_compiler_family.c temp file in '{}': {}",
+                        out_dir.display(),
+                        err
+                    )
+                    .into(),
+                })?;
+            let mut tmp_file = tmp.take_file().unwrap();
+            tmp_file.write_all(include_bytes!("detect_compiler_family.c"))?;
+            // Close the file handle *now*, otherwise the compiler may fail to open it on Windows
+            // (#1082). The file stays on disk and its path remains valid until `tmp` is dropped.
+            tmp_file.flush()?;
+            tmp_file.sync_data()?;
+            drop(tmp_file);
+
+            let stdout = run_output(
+                Command::new(path).arg("-E").arg(tmp.path()),
+                path,
+                // When expanding the file, the compiler prints a lot of information to stderr
+                // that it is not an error, but related to expanding itself.
+                //
+                // cc would have to disable warning here to prevent generation of too many warnings.
+                &{
+                    let mut cargo_output = cargo_output.clone();
+                    cargo_output.warnings = cargo_output.debug;
+                    cargo_output
+                },
+            )?;
+            let stdout = String::from_utf8_lossy(&stdout);
+
+            cargo_output.print_debug(&stdout);
+
+            // https://gitlab.kitware.com/cmake/cmake/-/blob/69a2eeb9dff5b60f2f1e5b425002a0fd45b7cadb/Modules/CMakeDetermineCompilerId.cmake#L267-271
+            let accepts_cl_style_flags = run(Command::new(path).arg("-?"), path, &{
+                // the errors are not errors!
+                let mut cargo_output = cargo_output.clone();
+                cargo_output.warnings = cargo_output.debug;
+                cargo_output.output = OutputKind::Discard;
+                cargo_output
+            })
+            .is_ok();
+
+            let clang = stdout.contains(r#""clang""#);
+            let gcc = stdout.contains(r#""gcc""#);
+            let emscripten = stdout.contains(r#""emscripten""#);
+            let vxworks = stdout.contains(r#""VxWorks""#);
+
+            match (clang, accepts_cl_style_flags, gcc, emscripten, vxworks) {
+                (clang_cl, true, _, false, false) => Ok(ToolFamily::Msvc { clang_cl }),
+                (true, _, _, _, false) | (_, _, _, true, false) => Ok(ToolFamily::Clang {
+                    zig_cc: is_zig_cc(path, cargo_output),
+                }),
+                (false, false, true, _, false) | (_, _, _, _, true) => Ok(ToolFamily::Gnu),
+                (false, false, false, false, false) => {
+                    cargo_output.print_warning(&"Compiler family detection failed since it does not define `__clang__`, `__GNUC__`, `__EMSCRIPTEN__` or `__VXWORKS__`, also does not accept cl style flag `-?`, fallback to treating it as GNU");
+                    Err(Error::new(
+                        ErrorKind::ToolFamilyMacroNotFound,
+                        "Expects macro `__clang__`, `__GNUC__` or `__EMSCRIPTEN__`, `__VXWORKS__` or accepts cl style flag `-?`, but found none",
+                    ))
+                }
+            }
+        }
+        let detect_family = |path: &Path| -> Result<ToolFamily, Error> {
+            if let Some(family) = cached_compiler_family.read().unwrap().get(path) {
+                return Ok(*family);
+            }
+
+            let family = detect_family_inner(path, cargo_output, out_dir)?;
+            cached_compiler_family
+                .write()
+                .unwrap()
+                .insert(path.into(), family);
+            Ok(family)
+        };
+
+        let family = detect_family(&path).unwrap_or_else(|e| {
+            cargo_output.print_warning(&format_args!(
+                "Compiler family detection failed due to error: {}",
+                e
+            ));
+            match path.file_name().map(OsStr::to_string_lossy) {
+                Some(fname) if fname.contains("clang-cl") => ToolFamily::Msvc { clang_cl: true },
+                Some(fname) if fname.ends_with("cl") || fname == "cl.exe" => {
+                    ToolFamily::Msvc { clang_cl: false }
+                }
+                Some(fname) if fname.contains("clang") => match clang_driver {
+                    Some("cl") => ToolFamily::Msvc { clang_cl: true },
+                    _ => ToolFamily::Clang {
+                        zig_cc: is_zig_cc(&path, cargo_output),
+                    },
+                },
+                Some(fname) if fname.contains("zig") => ToolFamily::Clang { zig_cc: true },
+                _ => ToolFamily::Gnu,
+            }
+        });
+
+        Tool {
+            path,
+            cc_wrapper_path: None,
+            cc_wrapper_args: Vec::new(),
+            args: Vec::new(),
+            env: Vec::new(),
+            family,
+            cuda,
+            removed_args: Vec::new(),
+            has_internal_target_arg: false,
+        }
+    }
+
+    /// Add an argument to be stripped from the final command arguments.
+    pub(crate) fn remove_arg(&mut self, flag: OsString) {
+        self.removed_args.push(flag);
+    }
+
+    /// Push an "exotic" flag to the end of the compiler's arguments list.
+    ///
+    /// Nvidia compiler accepts only the most common compiler flags like `-D`,
+    /// `-I`, `-c`, etc. Options meant specifically for the underlying
+    /// host C++ compiler have to be prefixed with `-Xcompiler`.
+    /// [Another possible future application for this function is passing
+    /// clang-specific flags to clang-cl, which otherwise accepts only
+    /// MSVC-specific options.]
+    pub(crate) fn push_cc_arg(&mut self, flag: OsString) {
+        if self.cuda {
+            self.args.push("-Xcompiler".into());
+        }
+        self.args.push(flag);
+    }
+
+    /// Checks if an argument or flag has already been specified or conflicts.
+    ///
+    /// Currently only checks optimization flags.
+    pub(crate) fn is_duplicate_opt_arg(&self, flag: &OsString) -> bool {
+        let flag = flag.to_str().unwrap();
+        let mut chars = flag.chars();
+
+        // Only duplicate check compiler flags
+        if self.is_like_msvc() {
+            if chars.next() != Some('/') {
+                return false;
+            }
+        } else if (self.is_like_gnu() || self.is_like_clang()) && chars.next() != Some('-') {
+            return false;
+        }
+
+        // Check for existing optimization flags (-O, /O)
+        if chars.next() == Some('O') {
+            return self
+                .args()
+                .iter()
+                .any(|a| a.to_str().unwrap_or("").chars().nth(1) == Some('O'));
+        }
+
+        // TODO Check for existing -m..., -m...=..., /arch:... flags
+        false
+    }
+
+    /// Don't push optimization arg if it conflicts with existing args.
+    pub(crate) fn push_opt_unless_duplicate(&mut self, flag: OsString) {
+        if self.is_duplicate_opt_arg(&flag) {
+            eprintln!("Info: Ignoring duplicate arg {:?}", &flag);
+        } else {
+            self.push_cc_arg(flag);
+        }
+    }
+
+    /// Converts this compiler into a `Command` that's ready to be run.
+    ///
+    /// This is useful for when the compiler needs to be executed and the
+    /// command returned will already have the initial arguments and environment
+    /// variables configured.
+    pub fn to_command(&self) -> Command {
+        let mut cmd = match self.cc_wrapper_path {
+            Some(ref cc_wrapper_path) => {
+                let mut cmd = Command::new(cc_wrapper_path);
+                cmd.arg(&self.path);
+                cmd
+            }
+            None => Command::new(&self.path),
+        };
+        cmd.args(&self.cc_wrapper_args);
+
+        let value = self
+            .args
+            .iter()
+            .filter(|a| !self.removed_args.contains(a))
+            .collect::<Vec<_>>();
+        cmd.args(&value);
+
+        for (k, v) in self.env.iter() {
+            cmd.env(k, v);
+        }
+        cmd
+    }
+
+    /// Returns the path for this compiler.
+    ///
+    /// Note that this may not be a path to a file on the filesystem, e.g. "cc",
+    /// but rather something which will be resolved when a process is spawned.
+    pub fn path(&self) -> &Path {
+        &self.path
+    }
+
+    /// Returns the default set of arguments to the compiler needed to produce
+    /// executables for the target this compiler generates.
+    pub fn args(&self) -> &[OsString] {
+        &self.args
+    }
+
+    /// Returns the set of environment variables needed for this compiler to
+    /// operate.
+    ///
+    /// This is typically only used for MSVC compilers currently.
+    pub fn env(&self) -> &[(OsString, OsString)] {
+        &self.env
+    }
+
+    /// Returns the compiler command in format of CC environment variable.
+    /// Or empty string if CC env was not present
+    ///
+    /// This is typically used by configure script
+    pub fn cc_env(&self) -> OsString {
+        match self.cc_wrapper_path {
+            Some(ref cc_wrapper_path) => {
+                let mut cc_env = cc_wrapper_path.as_os_str().to_owned();
+                cc_env.push(" ");
+                cc_env.push(self.path.to_path_buf().into_os_string());
+                for arg in self.cc_wrapper_args.iter() {
+                    cc_env.push(" ");
+                    cc_env.push(arg);
+                }
+                cc_env
+            }
+            None => OsString::from(""),
+        }
+    }
+
+    /// Returns the compiler flags in format of CFLAGS environment variable.
+    /// Important here - this will not be CFLAGS from env, its internal gcc's flags to use as CFLAGS
+    /// This is typically used by configure script
+    pub fn cflags_env(&self) -> OsString {
+        let mut flags = OsString::new();
+        for (i, arg) in self.args.iter().enumerate() {
+            if i > 0 {
+                flags.push(" ");
+            }
+            flags.push(arg);
+        }
+        flags
+    }
+
+    /// Whether the tool is GNU Compiler Collection-like.
+    pub fn is_like_gnu(&self) -> bool {
+        self.family == ToolFamily::Gnu
+    }
+
+    /// Whether the tool is Clang-like.
+    pub fn is_like_clang(&self) -> bool {
+        matches!(self.family, ToolFamily::Clang { .. })
+    }
+
+    /// Whether the tool is AppleClang under .xctoolchain
+    #[cfg(target_vendor = "apple")]
+    pub(crate) fn is_xctoolchain_clang(&self) -> bool {
+        let path = self.path.to_string_lossy();
+        path.contains(".xctoolchain/")
+    }
+    #[cfg(not(target_vendor = "apple"))]
+    pub(crate) fn is_xctoolchain_clang(&self) -> bool {
+        false
+    }
+
+    /// Whether the tool is MSVC-like.
+    pub fn is_like_msvc(&self) -> bool {
+        matches!(self.family, ToolFamily::Msvc { .. })
+    }
+}
+
+/// Represents the family of tools this tool belongs to.
+///
+/// Each family of tools differs in how and what arguments they accept.
+///
+/// Detection of a family is done on best-effort basis and may not accurately reflect the tool.
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum ToolFamily {
+    /// Tool is GNU Compiler Collection-like.
+    Gnu,
+    /// Tool is Clang-like. It differs from the GCC in a sense that it accepts superset of flags
+    /// and its cross-compilation approach is different.
+    Clang { zig_cc: bool },
+    /// Tool is the MSVC cl.exe.
+    Msvc { clang_cl: bool },
+}
+
+impl ToolFamily {
+    /// What the flag to request debug info for this family of tools look like
+    pub(crate) fn add_debug_flags(&self, cmd: &mut Tool, dwarf_version: Option<u32>) {
+        match *self {
+            ToolFamily::Msvc { .. } => {
+                cmd.push_cc_arg("-Z7".into());
+            }
+            ToolFamily::Gnu | ToolFamily::Clang { .. } => {
+                cmd.push_cc_arg(
+                    dwarf_version
+                        .map_or_else(|| "-g".into(), |v| format!("-gdwarf-{}", v))
+                        .into(),
+                );
+            }
+        }
+    }
+
+    /// What the flag to force frame pointers.
+    pub(crate) fn add_force_frame_pointer(&self, cmd: &mut Tool) {
+        match *self {
+            ToolFamily::Gnu | ToolFamily::Clang { .. } => {
+                cmd.push_cc_arg("-fno-omit-frame-pointer".into());
+            }
+            _ => (),
+        }
+    }
+
+    /// What the flags to enable all warnings
+    pub(crate) fn warnings_flags(&self) -> &'static str {
+        match *self {
+            ToolFamily::Msvc { .. } => "-W4",
+            ToolFamily::Gnu | ToolFamily::Clang { .. } => "-Wall",
+        }
+    }
+
+    /// What the flags to enable extra warnings
+    pub(crate) fn extra_warnings_flags(&self) -> Option<&'static str> {
+        match *self {
+            ToolFamily::Msvc { .. } => None,
+            ToolFamily::Gnu | ToolFamily::Clang { .. } => Some("-Wextra"),
+        }
+    }
+
+    /// What the flag to turn warning into errors
+    pub(crate) fn warnings_to_errors_flag(&self) -> &'static str {
+        match *self {
+            ToolFamily::Msvc { .. } => "-WX",
+            ToolFamily::Gnu | ToolFamily::Clang { .. } => "-Werror",
+        }
+    }
+
+    pub(crate) fn verbose_stderr(&self) -> bool {
+        matches!(*self, ToolFamily::Clang { .. })
+    }
+}

vendor/cc/src/utilities.rs

@@ -0,0 +1,45 @@
+use std::{
+    ffi::OsStr,
+    fmt::{self, Write},
+    path::Path,
+};
+
+pub(super) struct JoinOsStrs<'a, T> {
+    pub(super) slice: &'a [T],
+    pub(super) delimiter: char,
+}
+
+impl<T> fmt::Display for JoinOsStrs<'_, T>
+where
+    T: AsRef<OsStr>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let len = self.slice.len();
+        for (index, os_str) in self.slice.iter().enumerate() {
+            // TODO: Use OsStr::display once it is stablised,
+            // Path and OsStr has the same `Display` impl
+            write!(f, "{}", Path::new(os_str).display())?;
+            if index + 1 < len {
+                f.write_char(self.delimiter)?;
+            }
+        }
+        Ok(())
+    }
+}
+
+pub(super) struct OptionOsStrDisplay<T>(pub(super) Option<T>);
+
+impl<T> fmt::Display for OptionOsStrDisplay<T>
+where
+    T: AsRef<OsStr>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        // TODO: Use OsStr::display once it is stablised
+        // Path and OsStr has the same `Display` impl
+        if let Some(os_str) = self.0.as_ref() {
+            write!(f, "Some({})", Path::new(os_str).display())
+        } else {
+            f.write_str("None")
+        }
+    }
+}

vendor/cc/src/windows/com.rs

@@ -0,0 +1,110 @@
+// Copyright © 2017 winapi-rs developers
+// Licensed under the Apache License, Version 2.0
+// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
+// All files in the project carrying such notice may not be copied, modified, or distributed
+// except according to those terms.
+
+use crate::windows::{
+    winapi::{IUnknown, Interface},
+    windows_sys::{
+        CoInitializeEx, SysFreeString, SysStringLen, BSTR, COINIT_MULTITHREADED, HRESULT, S_FALSE,
+        S_OK,
+    },
+};
+use std::{
+    convert::TryInto,
+    ffi::OsString,
+    ops::Deref,
+    os::windows::ffi::OsStringExt,
+    ptr::{null, null_mut},
+    slice::from_raw_parts,
+};
+
+pub fn initialize() -> Result<(), HRESULT> {
+    let err = unsafe { CoInitializeEx(null(), COINIT_MULTITHREADED.try_into().unwrap()) };
+    if err != S_OK && err != S_FALSE {
+        // S_FALSE just means COM is already initialized
+        Err(err)
+    } else {
+        Ok(())
+    }
+}
+
+pub struct ComPtr<T>(*mut T)
+where
+    T: Interface;
+impl<T> ComPtr<T>
+where
+    T: Interface,
+{
+    /// Creates a `ComPtr` to wrap a raw pointer.
+    /// It takes ownership over the pointer which means it does __not__ call `AddRef`.
+    /// `T` __must__ be a COM interface that inherits from `IUnknown`.
+    pub unsafe fn from_raw(ptr: *mut T) -> ComPtr<T> {
+        assert!(!ptr.is_null());
+        ComPtr(ptr)
+    }
+    /// For internal use only.
+    fn as_unknown(&self) -> &IUnknown {
+        unsafe { &*(self.0 as *mut IUnknown) }
+    }
+    /// Performs `QueryInterface` fun.
+    pub fn cast<U>(&self) -> Result<ComPtr<U>, i32>
+    where
+        U: Interface,
+    {
+        let mut obj = null_mut();
+        let err = unsafe { self.as_unknown().QueryInterface(&U::uuidof(), &mut obj) };
+        if err < 0 {
+            return Err(err);
+        }
+        Ok(unsafe { ComPtr::from_raw(obj as *mut U) })
+    }
+}
+impl<T> Deref for ComPtr<T>
+where
+    T: Interface,
+{
+    type Target = T;
+    fn deref(&self) -> &T {
+        unsafe { &*self.0 }
+    }
+}
+impl<T> Clone for ComPtr<T>
+where
+    T: Interface,
+{
+    fn clone(&self) -> Self {
+        unsafe {
+            self.as_unknown().AddRef();
+            ComPtr::from_raw(self.0)
+        }
+    }
+}
+impl<T> Drop for ComPtr<T>
+where
+    T: Interface,
+{
+    fn drop(&mut self) {
+        unsafe {
+            self.as_unknown().Release();
+        }
+    }
+}
+pub struct BStr(BSTR);
+impl BStr {
+    pub unsafe fn from_raw(s: BSTR) -> BStr {
+        BStr(s)
+    }
+    pub fn to_osstring(&self) -> OsString {
+        let len = unsafe { SysStringLen(self.0) };
+        let slice = unsafe { from_raw_parts(self.0, len as usize) };
+        OsStringExt::from_wide(slice)
+    }
+}
+impl Drop for BStr {
+    fn drop(&mut self) {
+        unsafe { SysFreeString(self.0) };
+    }
+}

vendor/cc/src/windows/mod.rs

@@ -0,0 +1,22 @@
+//! These modules are all glue to support reading the MSVC version from
+//! the registry and from COM interfaces.
+
+// This is used in the crate's public API, so don't use #[cfg(windows)]
+pub mod find_tools;
+
+#[cfg(windows)]
+pub(crate) mod windows_sys;
+#[cfg(windows)]
+mod windows_targets;
+
+#[cfg(windows)]
+mod registry;
+#[cfg(windows)]
+#[macro_use]
+mod winapi;
+#[cfg(windows)]
+mod com;
+#[cfg(windows)]
+mod setup_config;
+#[cfg(windows)]
+mod vs_instances;

vendor/cc/src/windows/registry.rs

@@ -0,0 +1,191 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use crate::windows::windows_sys::{
+    RegCloseKey, RegEnumKeyExW, RegOpenKeyExW, RegQueryValueExW, ERROR_NO_MORE_ITEMS,
+    ERROR_SUCCESS, HKEY, HKEY_LOCAL_MACHINE, KEY_READ, KEY_WOW64_32KEY, REG_SZ,
+};
+use std::{
+    ffi::{OsStr, OsString},
+    io,
+    ops::RangeFrom,
+    os::windows::prelude::*,
+    ptr::null_mut,
+};
+
+/// Must never be `HKEY_PERFORMANCE_DATA`.
+pub(crate) struct RegistryKey(Repr);
+
+#[allow(clippy::upper_case_acronyms)]
+type DWORD = u32;
+
+struct OwnedKey(HKEY);
+
+/// Note: must not encode `HKEY_PERFORMANCE_DATA` or one of its subkeys.
+enum Repr {
+    /// `HKEY_LOCAL_MACHINE`.
+    LocalMachine,
+    /// A subkey of `HKEY_LOCAL_MACHINE`.
+    Owned(OwnedKey),
+}
+
+pub struct Iter<'a> {
+    idx: RangeFrom<DWORD>,
+    key: &'a RegistryKey,
+}
+
+unsafe impl Sync for Repr {}
+unsafe impl Send for Repr {}
+
+pub(crate) const LOCAL_MACHINE: RegistryKey = RegistryKey(Repr::LocalMachine);
+
+impl RegistryKey {
+    fn raw(&self) -> HKEY {
+        match self.0 {
+            Repr::LocalMachine => HKEY_LOCAL_MACHINE,
+            Repr::Owned(ref val) => val.0,
+        }
+    }
+
+    /// Open a sub-key of `self`.
+    pub fn open(&self, key: &OsStr) -> io::Result<RegistryKey> {
+        let key = key.encode_wide().chain(Some(0)).collect::<Vec<_>>();
+        let mut ret = null_mut();
+        let err = unsafe {
+            RegOpenKeyExW(
+                self.raw(),
+                key.as_ptr(),
+                0,
+                KEY_READ | KEY_WOW64_32KEY,
+                &mut ret,
+            )
+        };
+        if err == ERROR_SUCCESS {
+            Ok(RegistryKey(Repr::Owned(OwnedKey(ret))))
+        } else {
+            Err(io::Error::from_raw_os_error(err as i32))
+        }
+    }
+
+    pub fn iter(&self) -> Iter {
+        Iter {
+            idx: 0..,
+            key: self,
+        }
+    }
+
+    pub fn query_str(&self, name: &str) -> io::Result<OsString> {
+        let name: &OsStr = name.as_ref();
+        let name = name.encode_wide().chain(Some(0)).collect::<Vec<_>>();
+        let mut len = 0;
+        let mut kind = 0;
+        unsafe {
+            let err = RegQueryValueExW(
+                self.raw(),
+                name.as_ptr(),
+                null_mut(),
+                &mut kind,
+                null_mut(),
+                &mut len,
+            );
+            if err != ERROR_SUCCESS {
+                return Err(io::Error::from_raw_os_error(err as i32));
+            }
+            if kind != REG_SZ {
+                return Err(io::Error::new(
+                    io::ErrorKind::Other,
+                    "registry key wasn't a string",
+                ));
+            }
+
+            // The length here is the length in bytes, but we're using wide
+            // characters so we need to be sure to halve it for the length
+            // passed in.
+            assert!(len % 2 == 0, "impossible wide string size: {} bytes", len);
+            let vlen = len as usize / 2;
+            // Defensively initialized, see comment about
+            // `HKEY_PERFORMANCE_DATA` below.
+            let mut v = vec![0u16; vlen];
+            let err = RegQueryValueExW(
+                self.raw(),
+                name.as_ptr(),
+                null_mut(),
+                null_mut(),
+                v.as_mut_ptr() as *mut _,
+                &mut len,
+            );
+            // We don't check for `ERROR_MORE_DATA` (which would if the value
+            // grew between the first and second call to `RegQueryValueExW`),
+            // both because it's extremely unlikely, and this is a bit more
+            // defensive more defensive against weird types of registry keys.
+            if err != ERROR_SUCCESS {
+                return Err(io::Error::from_raw_os_error(err as i32));
+            }
+            // The length is allowed to change, but should still be even, as
+            // well as smaller.
+            assert!(len % 2 == 0, "impossible wide string size: {} bytes", len);
+            // If the length grew but returned a success code, it *probably*
+            // indicates we're `HKEY_PERFORMANCE_DATA` or a subkey(?). We
+            // consider this UB, since those keys write "undefined" or
+            // "unpredictable" values to len, and need to use a completely
+            // different loop structure. This should be impossible (and enforce
+            // it in the API to the best of our ability), but to mitigate the
+            // damage we do some smoke-checks on the len, and ensure `v` has
+            // been fully initialized (rather than trusting the result of
+            // `RegQueryValueExW`).
+            let actual_len = len as usize / 2;
+            assert!(actual_len <= v.len());
+            v.truncate(actual_len);
+            // Some registry keys may have a terminating nul character, but
+            // we're not interested in that, so chop it off if it's there.
+            if !v.is_empty() && v[v.len() - 1] == 0 {
+                v.pop();
+            }
+            Ok(OsString::from_wide(&v))
+        }
+    }
+}
+
+impl Drop for OwnedKey {
+    fn drop(&mut self) {
+        unsafe {
+            RegCloseKey(self.0);
+        }
+    }
+}
+
+impl<'a> Iterator for Iter<'a> {
+    type Item = io::Result<OsString>;
+
+    fn next(&mut self) -> Option<io::Result<OsString>> {
+        self.idx.next().and_then(|i| unsafe {
+            let mut v = Vec::with_capacity(256);
+            let mut len = v.capacity() as DWORD;
+            let ret = RegEnumKeyExW(
+                self.key.raw(),
+                i,
+                v.as_mut_ptr(),
+                &mut len,
+                null_mut(),
+                null_mut(),
+                null_mut(),
+                null_mut(),
+            );
+            if ret == ERROR_NO_MORE_ITEMS {
+                None
+            } else if ret != ERROR_SUCCESS {
+                Some(Err(io::Error::from_raw_os_error(ret as i32)))
+            } else {
+                v.set_len(len as usize);
+                Some(Ok(OsString::from_wide(&v)))
+            }
+        })
+    }
+}

vendor/cc/src/windows/setup_config.rs

@@ -0,0 +1,283 @@
+// Copyright © 2017 winapi-rs developers
+// Licensed under the Apache License, Version 2.0
+// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
+// All files in the project carrying such notice may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(bad_style)]
+#![allow(unused)]
+
+use crate::windows::{
+    com::{BStr, ComPtr},
+    winapi::{
+        IUnknown, IUnknownVtbl, Interface, LCID, LPCOLESTR, LPCWSTR, LPFILETIME, LPSAFEARRAY,
+        PULONGLONG, ULONG,
+    },
+    windows_sys::{CoCreateInstance, BSTR, CLSCTX_ALL, HRESULT, S_FALSE},
+};
+
+use std::{
+    ffi::OsString,
+    ptr::{null, null_mut},
+};
+
+// Bindings to the Setup.Configuration stuff
+pub type InstanceState = u32;
+
+pub const eNone: InstanceState = 0;
+pub const eLocal: InstanceState = 1;
+pub const eRegistered: InstanceState = 2;
+pub const eNoRebootRequired: InstanceState = 4;
+pub const eComplete: InstanceState = -1i32 as u32;
+
+RIDL! {#[uuid(0xb41463c3, 0x8866, 0x43b5, 0xbc, 0x33, 0x2b, 0x06, 0x76, 0xf7, 0xf4, 0x2e)]
+interface ISetupInstance(ISetupInstanceVtbl): IUnknown(IUnknownVtbl) {
+    fn GetInstanceId(
+        pbstrInstanceId: *mut BSTR,
+    ) -> HRESULT,
+    fn GetInstallDate(
+        pInstallDate: LPFILETIME,
+    ) -> HRESULT,
+    fn GetInstallationName(
+        pbstrInstallationName: *mut BSTR,
+    ) -> HRESULT,
+    fn GetInstallationPath(
+        pbstrInstallationPath: *mut BSTR,
+    ) -> HRESULT,
+    fn GetInstallationVersion(
+        pbstrInstallationVersion: *mut BSTR,
+    ) -> HRESULT,
+    fn GetDisplayName(
+        lcid: LCID,
+        pbstrDisplayName: *mut BSTR,
+    ) -> HRESULT,
+    fn GetDescription(
+        lcid: LCID,
+        pbstrDescription: *mut BSTR,
+    ) -> HRESULT,
+    fn ResolvePath(
+        pwszRelativePath: LPCOLESTR,
+        pbstrAbsolutePath: *mut BSTR,
+    ) -> HRESULT,
+}}
+
+RIDL! {#[uuid(0x89143c9a, 0x05af, 0x49b0, 0xb7, 0x17, 0x72, 0xe2, 0x18, 0xa2, 0x18, 0x5c)]
+interface ISetupInstance2(ISetupInstance2Vtbl): ISetupInstance(ISetupInstanceVtbl) {
+    fn GetState(
+        pState: *mut InstanceState,
+    ) -> HRESULT,
+    fn GetPackages(
+        ppsaPackages: *mut LPSAFEARRAY,
+    ) -> HRESULT,
+    fn GetProduct(
+        ppPackage: *mut *mut ISetupPackageReference,
+    ) -> HRESULT,
+    fn GetProductPath(
+        pbstrProductPath: *mut BSTR,
+    ) -> HRESULT,
+}}
+
+RIDL! {#[uuid(0x6380bcff, 0x41d3, 0x4b2e, 0x8b, 0x2e, 0xbf, 0x8a, 0x68, 0x10, 0xc8, 0x48)]
+interface IEnumSetupInstances(IEnumSetupInstancesVtbl): IUnknown(IUnknownVtbl) {
+    fn Next(
+        celt: ULONG,
+        rgelt: *mut *mut ISetupInstance,
+        pceltFetched: *mut ULONG,
+    ) -> HRESULT,
+    fn Skip(
+        celt: ULONG,
+    ) -> HRESULT,
+    fn Reset() -> HRESULT,
+    fn Clone(
+        ppenum: *mut *mut IEnumSetupInstances,
+    ) -> HRESULT,
+}}
+
+RIDL! {#[uuid(0x42843719, 0xdb4c, 0x46c2, 0x8e, 0x7c, 0x64, 0xf1, 0x81, 0x6e, 0xfd, 0x5b)]
+interface ISetupConfiguration(ISetupConfigurationVtbl): IUnknown(IUnknownVtbl) {
+    fn EnumInstances(
+        ppEnumInstances: *mut *mut IEnumSetupInstances,
+    ) -> HRESULT,
+    fn GetInstanceForCurrentProcess(
+        ppInstance: *mut *mut ISetupInstance,
+    ) -> HRESULT,
+    fn GetInstanceForPath(
+        wzPath: LPCWSTR,
+        ppInstance: *mut *mut ISetupInstance,
+    ) -> HRESULT,
+}}
+
+RIDL! {#[uuid(0x26aab78c, 0x4a60, 0x49d6, 0xaf, 0x3b, 0x3c, 0x35, 0xbc, 0x93, 0x36, 0x5d)]
+interface ISetupConfiguration2(ISetupConfiguration2Vtbl):
+    ISetupConfiguration(ISetupConfigurationVtbl) {
+    fn EnumAllInstances(
+        ppEnumInstances: *mut *mut IEnumSetupInstances,
+    ) -> HRESULT,
+}}
+
+RIDL! {#[uuid(0xda8d8a16, 0xb2b6, 0x4487, 0xa2, 0xf1, 0x59, 0x4c, 0xcc, 0xcd, 0x6b, 0xf5)]
+interface ISetupPackageReference(ISetupPackageReferenceVtbl): IUnknown(IUnknownVtbl) {
+    fn GetId(
+        pbstrId: *mut BSTR,
+    ) -> HRESULT,
+    fn GetVersion(
+        pbstrVersion: *mut BSTR,
+    ) -> HRESULT,
+    fn GetChip(
+        pbstrChip: *mut BSTR,
+    ) -> HRESULT,
+    fn GetLanguage(
+        pbstrLanguage: *mut BSTR,
+    ) -> HRESULT,
+    fn GetBranch(
+        pbstrBranch: *mut BSTR,
+    ) -> HRESULT,
+    fn GetType(
+        pbstrType: *mut BSTR,
+    ) -> HRESULT,
+    fn GetUniqueId(
+        pbstrUniqueId: *mut BSTR,
+    ) -> HRESULT,
+}}
+
+RIDL! {#[uuid(0x42b21b78, 0x6192, 0x463e, 0x87, 0xbf, 0xd5, 0x77, 0x83, 0x8f, 0x1d, 0x5c)]
+interface ISetupHelper(ISetupHelperVtbl): IUnknown(IUnknownVtbl) {
+    fn ParseVersion(
+        pwszVersion: LPCOLESTR,
+        pullVersion: PULONGLONG,
+    ) -> HRESULT,
+    fn ParseVersionRange(
+        pwszVersionRange: LPCOLESTR,
+        pullMinVersion: PULONGLONG,
+        pullMaxVersion: PULONGLONG,
+    ) -> HRESULT,
+}}
+
+DEFINE_GUID! {CLSID_SetupConfiguration,
+0x177f0c4a, 0x1cd3, 0x4de7, 0xa3, 0x2c, 0x71, 0xdb, 0xbb, 0x9f, 0xa3, 0x6d}
+
+// Safe wrapper around the COM interfaces
+pub struct SetupConfiguration(ComPtr<ISetupConfiguration>);
+
+impl SetupConfiguration {
+    pub fn new() -> Result<SetupConfiguration, i32> {
+        let mut obj = null_mut();
+        let err = unsafe {
+            CoCreateInstance(
+                &CLSID_SetupConfiguration,
+                null_mut(),
+                CLSCTX_ALL,
+                &ISetupConfiguration::uuidof(),
+                &mut obj,
+            )
+        };
+        if err < 0 {
+            return Err(err);
+        }
+        let obj = unsafe { ComPtr::from_raw(obj as *mut ISetupConfiguration) };
+        Ok(SetupConfiguration(obj))
+    }
+    pub fn get_instance_for_current_process(&self) -> Result<SetupInstance, i32> {
+        let mut obj = null_mut();
+        let err = unsafe { self.0.GetInstanceForCurrentProcess(&mut obj) };
+        if err < 0 {
+            return Err(err);
+        }
+        Ok(unsafe { SetupInstance::from_raw(obj) })
+    }
+    pub fn enum_instances(&self) -> Result<EnumSetupInstances, i32> {
+        let mut obj = null_mut();
+        let err = unsafe { self.0.EnumInstances(&mut obj) };
+        if err < 0 {
+            return Err(err);
+        }
+        Ok(unsafe { EnumSetupInstances::from_raw(obj) })
+    }
+    pub fn enum_all_instances(&self) -> Result<EnumSetupInstances, i32> {
+        let mut obj = null_mut();
+        let this = self.0.cast::<ISetupConfiguration2>()?;
+        let err = unsafe { this.EnumAllInstances(&mut obj) };
+        if err < 0 {
+            return Err(err);
+        }
+        Ok(unsafe { EnumSetupInstances::from_raw(obj) })
+    }
+}
+
+pub struct SetupInstance(ComPtr<ISetupInstance>);
+
+impl SetupInstance {
+    pub unsafe fn from_raw(obj: *mut ISetupInstance) -> SetupInstance {
+        SetupInstance(ComPtr::from_raw(obj))
+    }
+    pub fn instance_id(&self) -> Result<OsString, i32> {
+        let mut s = null();
+        let err = unsafe { self.0.GetInstanceId(&mut s) };
+        let bstr = unsafe { BStr::from_raw(s) };
+        if err < 0 {
+            return Err(err);
+        }
+        Ok(bstr.to_osstring())
+    }
+    pub fn installation_name(&self) -> Result<OsString, i32> {
+        let mut s = null();
+        let err = unsafe { self.0.GetInstallationName(&mut s) };
+        let bstr = unsafe { BStr::from_raw(s) };
+        if err < 0 {
+            return Err(err);
+        }
+        Ok(bstr.to_osstring())
+    }
+    pub fn installation_path(&self) -> Result<OsString, i32> {
+        let mut s = null();
+        let err = unsafe { self.0.GetInstallationPath(&mut s) };
+        let bstr = unsafe { BStr::from_raw(s) };
+        if err < 0 {
+            return Err(err);
+        }
+        Ok(bstr.to_osstring())
+    }
+    pub fn installation_version(&self) -> Result<OsString, i32> {
+        let mut s = null();
+        let err = unsafe { self.0.GetInstallationVersion(&mut s) };
+        let bstr = unsafe { BStr::from_raw(s) };
+        if err < 0 {
+            return Err(err);
+        }
+        Ok(bstr.to_osstring())
+    }
+    pub fn product_path(&self) -> Result<OsString, i32> {
+        let mut s = null();
+        let this = self.0.cast::<ISetupInstance2>()?;
+        let err = unsafe { this.GetProductPath(&mut s) };
+        let bstr = unsafe { BStr::from_raw(s) };
+        if err < 0 {
+            return Err(err);
+        }
+        Ok(bstr.to_osstring())
+    }
+}
+
+pub struct EnumSetupInstances(ComPtr<IEnumSetupInstances>);
+
+impl EnumSetupInstances {
+    pub unsafe fn from_raw(obj: *mut IEnumSetupInstances) -> EnumSetupInstances {
+        EnumSetupInstances(ComPtr::from_raw(obj))
+    }
+}
+
+impl Iterator for EnumSetupInstances {
+    type Item = Result<SetupInstance, i32>;
+    fn next(&mut self) -> Option<Result<SetupInstance, i32>> {
+        let mut obj = null_mut();
+        let err = unsafe { self.0.Next(1, &mut obj, null_mut()) };
+        if err < 0 {
+            return Some(Err(err));
+        }
+        if err == S_FALSE {
+            return None;
+        }
+        Some(Ok(unsafe { SetupInstance::from_raw(obj) }))
+    }
+}

vendor/cc/src/windows/vs_instances.rs

@@ -0,0 +1,199 @@
+use std::borrow::Cow;
+use std::collections::HashMap;
+use std::convert::TryFrom;
+use std::io::BufRead;
+use std::path::PathBuf;
+
+use crate::windows::setup_config::{EnumSetupInstances, SetupInstance};
+
+pub enum VsInstance {
+    Com(SetupInstance),
+    Vswhere(VswhereInstance),
+}
+
+impl VsInstance {
+    pub fn installation_name(&self) -> Option<Cow<str>> {
+        match self {
+            VsInstance::Com(s) => s
+                .installation_name()
+                .ok()
+                .and_then(|s| s.into_string().ok())
+                .map(Cow::from),
+            VsInstance::Vswhere(v) => v.map.get("installationName").map(Cow::from),
+        }
+    }
+
+    pub fn installation_path(&self) -> Option<PathBuf> {
+        match self {
+            VsInstance::Com(s) => s.installation_path().ok().map(PathBuf::from),
+            VsInstance::Vswhere(v) => v.map.get("installationPath").map(PathBuf::from),
+        }
+    }
+
+    pub fn installation_version(&self) -> Option<Cow<str>> {
+        match self {
+            VsInstance::Com(s) => s
+                .installation_version()
+                .ok()
+                .and_then(|s| s.into_string().ok())
+                .map(Cow::from),
+            VsInstance::Vswhere(v) => v.map.get("installationVersion").map(Cow::from),
+        }
+    }
+}
+
+pub enum VsInstances {
+    ComBased(EnumSetupInstances),
+    VswhereBased(VswhereInstance),
+}
+
+impl IntoIterator for VsInstances {
+    type Item = VsInstance;
+    #[allow(bare_trait_objects)]
+    type IntoIter = Box<Iterator<Item = Self::Item>>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        match self {
+            VsInstances::ComBased(e) => {
+                Box::new(e.into_iter().filter_map(Result::ok).map(VsInstance::Com))
+            }
+            VsInstances::VswhereBased(v) => Box::new(std::iter::once(VsInstance::Vswhere(v))),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct VswhereInstance {
+    map: HashMap<String, String>,
+}
+
+impl TryFrom<&Vec<u8>> for VswhereInstance {
+    type Error = &'static str;
+
+    fn try_from(output: &Vec<u8>) -> Result<Self, Self::Error> {
+        let map: HashMap<_, _> = output
+            .lines()
+            .map_while(Result::ok)
+            .filter_map(|s| {
+                let mut splitn = s.splitn(2, ": ");
+                Some((splitn.next()?.to_owned(), splitn.next()?.to_owned()))
+            })
+            .collect();
+
+        if !map.contains_key("installationName")
+            || !map.contains_key("installationPath")
+            || !map.contains_key("installationVersion")
+        {
+            return Err("required properties not found");
+        }
+
+        Ok(Self { map })
+    }
+}
+
+#[cfg(test)]
+mod tests_ {
+    use std::borrow::Cow;
+    use std::convert::TryFrom;
+    use std::path::PathBuf;
+
+    #[test]
+    fn it_parses_vswhere_output_correctly() {
+        let output = br"instanceId: 58104422
+installDate: 21/02/2021 21:50:33
+installationName: VisualStudio/16.9.2+31112.23
+installationPath: C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools
+installationVersion: 16.9.31112.23
+productId: Microsoft.VisualStudio.Product.BuildTools
+productPath: C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\Common7\Tools\LaunchDevCmd.bat
+state: 4294967295
+isComplete: 1
+isLaunchable: 1
+isPrerelease: 0
+isRebootRequired: 0
+displayName: Visual Studio Build Tools 2019
+description: The Visual Studio Build Tools allows you to build native and managed MSBuild-based applications without requiring the Visual Studio IDE. There are options to install the Visual C++ compilers and libraries, MFC, ATL, and C++/CLI support.
+channelId: VisualStudio.16.Release
+channelUri: https://aka.ms/vs/16/release/channel
+enginePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\resources\app\ServiceHub\Services\Microsoft.VisualStudio.Setup.Service
+releaseNotes: https://docs.microsoft.com/en-us/visualstudio/releases/2019/release-notes-v16.9#16.9.2
+thirdPartyNotices: https://go.microsoft.com/fwlink/?LinkId=660909
+updateDate: 2021-03-17T21:16:46.5963702Z
+catalog_buildBranch: d16.9
+catalog_buildVersion: 16.9.31112.23
+catalog_id: VisualStudio/16.9.2+31112.23
+catalog_localBuild: build-lab
+catalog_manifestName: VisualStudio
+catalog_manifestType: installer
+catalog_productDisplayVersion: 16.9.2
+catalog_productLine: Dev16
+catalog_productLineVersion: 2019
+catalog_productMilestone: RTW
+catalog_productMilestoneIsPreRelease: False
+catalog_productName: Visual Studio
+catalog_productPatchVersion: 2
+catalog_productPreReleaseMilestoneSuffix: 1.0
+catalog_productSemanticVersion: 16.9.2+31112.23
+catalog_requiredEngineVersion: 2.9.3365.38425
+properties_campaignId: 156063665.1613940062
+properties_channelManifestId: VisualStudio.16.Release/16.9.2+31112.23
+properties_nickname: 
+properties_setupEngineFilePath: C:\Program Files (x86)\Microsoft Visual Studio\Installer\vs_installershell.exe
+"
+        .to_vec();
+
+        let vswhere_instance = super::VswhereInstance::try_from(&output);
+        assert!(vswhere_instance.is_ok());
+
+        let vs_instance = super::VsInstance::Vswhere(vswhere_instance.unwrap());
+        assert_eq!(
+            vs_instance.installation_name(),
+            Some(Cow::from("VisualStudio/16.9.2+31112.23"))
+        );
+        assert_eq!(
+            vs_instance.installation_path(),
+            Some(PathBuf::from(
+                r"C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools"
+            ))
+        );
+        assert_eq!(
+            vs_instance.installation_version(),
+            Some(Cow::from("16.9.31112.23"))
+        );
+    }
+
+    #[test]
+    fn it_returns_an_error_for_empty_output() {
+        let output = b"".to_vec();
+
+        let vswhere_instance = super::VswhereInstance::try_from(&output);
+
+        assert!(vswhere_instance.is_err());
+    }
+
+    #[test]
+    fn it_returns_an_error_for_output_consisting_of_empty_lines() {
+        let output = br"
+
+"
+        .to_vec();
+
+        let vswhere_instance = super::VswhereInstance::try_from(&output);
+
+        assert!(vswhere_instance.is_err());
+    }
+
+    #[test]
+    fn it_returns_an_error_for_output_without_required_properties() {
+        let output = br"instanceId: 58104422
+installDate: 21/02/2021 21:50:33
+productId: Microsoft.VisualStudio.Product.BuildTools
+productPath: C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\Common7\Tools\LaunchDevCmd.bat
+"
+        .to_vec();
+
+        let vswhere_instance = super::VswhereInstance::try_from(&output);
+
+        assert!(vswhere_instance.is_err());
+    }
+}

vendor/cc/src/windows/winapi.rs

@@ -0,0 +1,146 @@
+// Copyright © 2015-2017 winapi-rs developers
+// Licensed under the Apache License, Version 2.0
+// <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option.
+// All files in the project carrying such notice may not be copied, modified, or distributed
+// except according to those terms.
+
+#![allow(bad_style, clippy::upper_case_acronyms)]
+
+use std::os::raw;
+
+pub type wchar_t = u16;
+
+pub use crate::windows::windows_sys::{FILETIME, GUID, HRESULT, SAFEARRAY};
+
+pub type REFIID = *const IID;
+pub type IID = GUID;
+pub type ULONG = raw::c_ulong;
+pub type DWORD = u32;
+pub type LPFILETIME = *mut FILETIME;
+pub type OLECHAR = WCHAR;
+pub type WCHAR = wchar_t;
+pub type LPCOLESTR = *const OLECHAR;
+pub type LCID = DWORD;
+pub type LPCWSTR = *const WCHAR;
+pub type PULONGLONG = *mut ULONGLONG;
+pub type ULONGLONG = u64;
+
+pub trait Interface {
+    fn uuidof() -> GUID;
+}
+
+pub type LPSAFEARRAY = *mut SAFEARRAY;
+
+macro_rules! DEFINE_GUID {
+    (
+        $name:ident, $l:expr, $w1:expr, $w2:expr,
+        $b1:expr, $b2:expr, $b3:expr, $b4:expr, $b5:expr, $b6:expr, $b7:expr, $b8:expr
+    ) => {
+        pub const $name: $crate::windows::winapi::GUID = $crate::windows::winapi::GUID {
+            data1: $l,
+            data2: $w1,
+            data3: $w2,
+            data4: [$b1, $b2, $b3, $b4, $b5, $b6, $b7, $b8],
+        };
+    };
+}
+
+macro_rules! RIDL {
+    (#[uuid($($uuid:expr),+)]
+    interface $interface:ident ($vtbl:ident) {$(
+        fn $method:ident($($p:ident : $t:ty,)*) -> $rtr:ty,
+    )+}) => (
+        #[repr(C)]
+        pub struct $vtbl {
+            $(pub $method: unsafe extern "system" fn(
+                This: *mut $interface,
+                $($p: $t),*
+            ) -> $rtr,)+
+        }
+        #[repr(C)]
+        pub struct $interface {
+            pub lpVtbl: *const $vtbl,
+        }
+        RIDL!{@impl $interface {$(fn $method($($p: $t,)*) -> $rtr,)+}}
+        RIDL!{@uuid $interface $($uuid),+}
+    );
+    (#[uuid($($uuid:expr),+)]
+    interface $interface:ident ($vtbl:ident) : $pinterface:ident ($pvtbl:ident) {
+    }) => (
+        #[repr(C)]
+        pub struct $vtbl {
+            pub parent: $pvtbl,
+        }
+        #[repr(C)]
+        pub struct $interface {
+            pub lpVtbl: *const $vtbl,
+        }
+        RIDL!{@deref $interface $pinterface}
+        RIDL!{@uuid $interface $($uuid),+}
+    );
+    (#[uuid($($uuid:expr),+)]
+    interface $interface:ident ($vtbl:ident) : $pinterface:ident ($pvtbl:ident) {$(
+        fn $method:ident($($p:ident : $t:ty,)*) -> $rtr:ty,
+    )+}) => (
+        #[repr(C)]
+        pub struct $vtbl {
+            pub parent: $pvtbl,
+            $(pub $method: unsafe extern "system" fn(
+                This: *mut $interface,
+                $($p: $t,)*
+            ) -> $rtr,)+
+        }
+        #[repr(C)]
+        pub struct $interface {
+            pub lpVtbl: *const $vtbl,
+        }
+        RIDL!{@impl $interface {$(fn $method($($p: $t,)*) -> $rtr,)+}}
+        RIDL!{@deref $interface $pinterface}
+        RIDL!{@uuid $interface $($uuid),+}
+    );
+    (@deref $interface:ident $pinterface:ident) => (
+        impl ::std::ops::Deref for $interface {
+            type Target = $pinterface;
+            #[inline]
+            fn deref(&self) -> &$pinterface {
+                unsafe { &*(self as *const $interface as *const $pinterface) }
+            }
+        }
+    );
+    (@impl $interface:ident {$(
+        fn $method:ident($($p:ident : $t:ty,)*) -> $rtr:ty,
+    )+}) => (
+        impl $interface {
+            $(#[inline] pub unsafe fn $method(&self, $($p: $t,)*) -> $rtr {
+                ((*self.lpVtbl).$method)(self as *const _ as *mut _, $($p,)*)
+            })+
+        }
+    );
+    (@uuid $interface:ident
+        $l:expr, $w1:expr, $w2:expr,
+        $b1:expr, $b2:expr, $b3:expr, $b4:expr, $b5:expr, $b6:expr, $b7:expr, $b8:expr
+    ) => (
+        impl $crate::windows::winapi::Interface for $interface {
+            #[inline]
+            fn uuidof() -> $crate::windows::winapi::GUID {
+                $crate::windows::winapi::GUID {
+                    data1: $l,
+                    data2: $w1,
+                    data3: $w2,
+                    data4: [$b1, $b2, $b3, $b4, $b5, $b6, $b7, $b8],
+                }
+            }
+        }
+    );
+}
+
+RIDL! {#[uuid(0x00000000, 0x0000, 0x0000, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46)]
+interface IUnknown(IUnknownVtbl) {
+    fn QueryInterface(
+        riid: REFIID,
+        ppvObject: *mut *mut raw::c_void,
+    ) -> HRESULT,
+    fn AddRef() -> ULONG,
+    fn Release() -> ULONG,
+}}

vendor/cc/src/windows/windows_sys.rs

@@ -0,0 +1,121 @@
+// This file is autogenerated.
+//
+// To add bindings, edit windows_sys.lst then run:
+//
+// ```
+// cd generate-windows-sys/
+// cargo run
+// ```
+// Bindings generated by `windows-bindgen` 0.58.0
+
+#![allow(
+    non_snake_case,
+    non_upper_case_globals,
+    non_camel_case_types,
+    dead_code,
+    clippy::all
+)]
+windows_targets::link!("advapi32.dll" "system" fn RegCloseKey(hkey : HKEY) -> WIN32_ERROR);
+windows_targets::link!("advapi32.dll" "system" fn RegEnumKeyExW(hkey : HKEY, dwindex : u32, lpname : PWSTR, lpcchname : *mut u32, lpreserved : *const u32, lpclass : PWSTR, lpcchclass : *mut u32, lpftlastwritetime : *mut FILETIME) -> WIN32_ERROR);
+windows_targets::link!("advapi32.dll" "system" fn RegOpenKeyExW(hkey : HKEY, lpsubkey : PCWSTR, uloptions : u32, samdesired : REG_SAM_FLAGS, phkresult : *mut HKEY) -> WIN32_ERROR);
+windows_targets::link!("advapi32.dll" "system" fn RegQueryValueExW(hkey : HKEY, lpvaluename : PCWSTR, lpreserved : *const u32, lptype : *mut REG_VALUE_TYPE, lpdata : *mut u8, lpcbdata : *mut u32) -> WIN32_ERROR);
+windows_targets::link!("kernel32.dll" "system" fn FreeLibrary(hlibmodule : HMODULE) -> BOOL);
+windows_targets::link!("kernel32.dll" "system" fn GetMachineTypeAttributes(machine : u16, machinetypeattributes : *mut MACHINE_ATTRIBUTES) -> HRESULT);
+windows_targets::link!("kernel32.dll" "system" fn GetProcAddress(hmodule : HMODULE, lpprocname : PCSTR) -> FARPROC);
+windows_targets::link!("kernel32.dll" "system" fn LoadLibraryA(lplibfilename : PCSTR) -> HMODULE);
+windows_targets::link!("kernel32.dll" "system" fn OpenSemaphoreA(dwdesiredaccess : u32, binherithandle : BOOL, lpname : PCSTR) -> HANDLE);
+windows_targets::link!("kernel32.dll" "system" fn PeekNamedPipe(hnamedpipe : HANDLE, lpbuffer : *mut core::ffi::c_void, nbuffersize : u32, lpbytesread : *mut u32, lptotalbytesavail : *mut u32, lpbytesleftthismessage : *mut u32) -> BOOL);
+windows_targets::link!("kernel32.dll" "system" fn ReleaseSemaphore(hsemaphore : HANDLE, lreleasecount : i32, lppreviouscount : *mut i32) -> BOOL);
+windows_targets::link!("kernel32.dll" "system" fn WaitForSingleObject(hhandle : HANDLE, dwmilliseconds : u32) -> WAIT_EVENT);
+windows_targets::link!("ole32.dll" "system" fn CoCreateInstance(rclsid : *const GUID, punkouter : * mut core::ffi::c_void, dwclscontext : CLSCTX, riid : *const GUID, ppv : *mut *mut core::ffi::c_void) -> HRESULT);
+windows_targets::link!("ole32.dll" "system" fn CoInitializeEx(pvreserved : *const core::ffi::c_void, dwcoinit : u32) -> HRESULT);
+windows_targets::link!("oleaut32.dll" "system" fn SysFreeString(bstrstring : BSTR));
+windows_targets::link!("oleaut32.dll" "system" fn SysStringLen(pbstr : BSTR) -> u32);
+pub type ADVANCED_FEATURE_FLAGS = u16;
+pub type BOOL = i32;
+pub type BSTR = *const u16;
+pub type CLSCTX = u32;
+pub const CLSCTX_ALL: CLSCTX = 23u32;
+pub type COINIT = i32;
+pub const COINIT_MULTITHREADED: COINIT = 0i32;
+pub const ERROR_NO_MORE_ITEMS: WIN32_ERROR = 259u32;
+pub const ERROR_SUCCESS: WIN32_ERROR = 0u32;
+pub const FALSE: BOOL = 0i32;
+pub type FARPROC = Option<unsafe extern "system" fn() -> isize>;
+#[repr(C)]
+#[derive(Clone, Copy)]
+pub struct FILETIME {
+    pub dwLowDateTime: u32,
+    pub dwHighDateTime: u32,
+}
+pub const FILE_ATTRIBUTE_TEMPORARY: FILE_FLAGS_AND_ATTRIBUTES = 256u32;
+pub type FILE_FLAGS_AND_ATTRIBUTES = u32;
+#[repr(C)]
+#[derive(Clone, Copy)]
+pub struct GUID {
+    pub data1: u32,
+    pub data2: u16,
+    pub data3: u16,
+    pub data4: [u8; 8],
+}
+impl GUID {
+    pub const fn from_u128(uuid: u128) -> Self {
+        Self {
+            data1: (uuid >> 96) as u32,
+            data2: (uuid >> 80 & 0xffff) as u16,
+            data3: (uuid >> 64 & 0xffff) as u16,
+            data4: (uuid as u64).to_be_bytes(),
+        }
+    }
+}
+pub type HANDLE = *mut core::ffi::c_void;
+pub type HKEY = *mut core::ffi::c_void;
+pub const HKEY_LOCAL_MACHINE: HKEY = -2147483646i32 as _;
+pub type HMODULE = *mut core::ffi::c_void;
+pub type HRESULT = i32;
+pub type IMAGE_FILE_MACHINE = u16;
+pub const IMAGE_FILE_MACHINE_AMD64: IMAGE_FILE_MACHINE = 34404u16;
+pub const KEY_READ: REG_SAM_FLAGS = 131097u32;
+pub const KEY_WOW64_32KEY: REG_SAM_FLAGS = 512u32;
+pub type MACHINE_ATTRIBUTES = i32;
+pub type PCSTR = *const u8;
+pub type PCWSTR = *const u16;
+pub type PWSTR = *mut u16;
+pub type REG_SAM_FLAGS = u32;
+pub const REG_SZ: REG_VALUE_TYPE = 1u32;
+pub type REG_VALUE_TYPE = u32;
+#[repr(C)]
+#[derive(Clone, Copy)]
+pub struct SAFEARRAY {
+    pub cDims: u16,
+    pub fFeatures: ADVANCED_FEATURE_FLAGS,
+    pub cbElements: u32,
+    pub cLocks: u32,
+    pub pvData: *mut core::ffi::c_void,
+    pub rgsabound: [SAFEARRAYBOUND; 1],
+}
+#[repr(C)]
+#[derive(Clone, Copy)]
+pub struct SAFEARRAYBOUND {
+    pub cElements: u32,
+    pub lLbound: i32,
+}
+pub const SEMAPHORE_MODIFY_STATE: SYNCHRONIZATION_ACCESS_RIGHTS = 2u32;
+pub type SYNCHRONIZATION_ACCESS_RIGHTS = u32;
+pub const S_FALSE: HRESULT = 0x1_u32 as _;
+pub const S_OK: HRESULT = 0x0_u32 as _;
+pub type THREAD_ACCESS_RIGHTS = u32;
+pub const THREAD_SYNCHRONIZE: THREAD_ACCESS_RIGHTS = 1048576u32;
+pub const UserEnabled: MACHINE_ATTRIBUTES = 1i32;
+pub const WAIT_ABANDONED: WAIT_EVENT = 128u32;
+pub type WAIT_EVENT = u32;
+pub const WAIT_FAILED: WAIT_EVENT = 4294967295u32;
+pub const WAIT_OBJECT_0: WAIT_EVENT = 0u32;
+pub const WAIT_TIMEOUT: WAIT_EVENT = 258u32;
+pub type WIN32_ERROR = u32;
+
+#[link(name = "advapi32")]
+#[link(name = "ole32")]
+#[link(name = "oleaut32")]
+extern "C" {}
+use super::windows_targets;

vendor/cc/src/windows/windows_targets.rs

@@ -0,0 +1,19 @@
+//! Provides the `link!` macro used by the generated windows bindings.
+//!
+//! This is a simple wrapper around an `extern` block with a `#[link]` attribute.
+//! It's very roughly equivalent to the windows-targets crate.
+
+macro_rules! link_macro {
+    ($library:literal $abi:literal $($link_name:literal)? $(#[$doc:meta])? fn $($function:tt)*) => (
+        // Note: the windows-targets crate uses a pre-built Windows.lib import library which we don't
+        // have in this repo. So instead we always link kernel32.lib and add the rest of the import
+        // libraries below by using an empty extern block. This works because extern blocks are not
+        // connected to the library given in the #[link] attribute.
+        #[link(name = "kernel32")]
+        extern $abi {
+            $(#[link_name=$link_name])?
+            pub fn $($function)*;
+        }
+    )
+}
+pub(crate) use link_macro as link;