Remove vendored dependencies

While it appears that by now we actually can get successful builds
without Cargo insisting on Internet access by virtue of using the
--frozen flag, maintaining vendored dependencies is somewhat of a pain
point. This state will also get worse with upcoming changes that replace
argparse in favor of structopt and pull in a slew of new dependencies by
doing so. Then there is also the repository structure aspect, which is
non-standard due to the way we vendor dependencies and a potential
source of confusion.
In order to fix these problems, this change removes all the vendored
dependencies we have.

Delete subrepo argparse/:argparse
Delete subrepo base32/:base32
Delete subrepo cc/:cc
Delete subrepo cfg-if/:cfg-if
Delete subrepo getrandom/:getrandom
Delete subrepo lazy-static/:lazy-static
Delete subrepo libc/:libc
Delete subrepo nitrokey-sys/:nitrokey-sys
Delete subrepo nitrokey/:nitrokey
Delete subrepo rand/:rand

1 files changed, 0 insertions, 754 deletions

diff --git a/cc/src/windows_registry.rs b/cc/src/windows_registry.rs
deleted file mode 100644
index 5af3ff7..0000000
--- a/cc/src/windows_registry.rs
+++ /dev/null
@@ -1,754 +0,0 @@
-// 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
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! A helper module to probe the Windows Registry when looking for
-//! windows-specific tools.
-
-use std::process::Command;
-
-use crate::Tool;
-
-/// Attempts to find a tool within an MSVC installation using the Windows
-/// registry as a point to search from.
-///
-/// The `target` argument is the target that the tool should work for (e.g.
-/// compile or link for) and the `tool` argument is the tool to find (e.g.
-/// `cl.exe` or `link.exe`).
-///
-/// This function will return `None` if the tool could not be found, or it will
-/// return `Some(cmd)` which represents a command that's ready to execute the
-/// tool with the appropriate environment variables set.
-///
-/// Note that this function always returns `None` for non-MSVC targets.
-pub fn find(target: &str, tool: &str) -> Option<Command> {
-    find_tool(target, tool).map(|c| c.to_command())
-}
-
-/// Similar to the `find` function above, this function will attempt the same
-/// operation (finding a MSVC tool in a local install) but instead returns a
-/// `Tool` which may be introspected.
-#[cfg(not(windows))]
-pub fn find_tool(_target: &str, _tool: &str) -> Option<Tool> {
-    None
-}
-
-/// Documented above.
-#[cfg(windows)]
-pub fn find_tool(target: &str, tool: &str) -> Option<Tool> {
-    use std::env;
-
-    // This logic is all tailored for MSVC, if we're not that then bail out
-    // early.
-    if !target.contains("msvc") {
-        return None;
-    }
-
-    // Looks like msbuild isn't located in the same location as other tools like
-    // cl.exe and lib.exe. To handle this we probe for it manually with
-    // dedicated registry keys.
-    if tool.contains("msbuild") {
-        return impl_::find_msbuild(target);
-    }
-
-    if tool.contains("devenv") {
-        return impl_::find_devenv(target);
-    }
-
-    // If VCINSTALLDIR is set, then someone's probably already run vcvars and we
-    // should just find whatever that indicates.
-    if env::var_os("VCINSTALLDIR").is_some() {
-        return env::var_os("PATH")
-            .and_then(|path| {
-                env::split_paths(&path)
-                    .map(|p| p.join(tool))
-                    .find(|p| p.exists())
-            })
-            .map(|path| Tool::new(path.into()));
-    }
-
-    // Ok, if we're here, now comes the fun part of the probing. Default shells
-    // or shells like MSYS aren't really configured to execute `cl.exe` and the
-    // various compiler tools shipped as part of Visual Studio. Here we try to
-    // first find the relevant tool, then we also have to be sure to fill in
-    // environment variables like `LIB`, `INCLUDE`, and `PATH` to ensure that
-    // the tool is actually usable.
-
-    return impl_::find_msvc_15(tool, target)
-        .or_else(|| impl_::find_msvc_14(tool, target))
-        .or_else(|| impl_::find_msvc_12(tool, target))
-        .or_else(|| impl_::find_msvc_11(tool, target));
-}
-
-/// A version of Visual Studio
-#[derive(Debug, PartialEq, Eq, Copy, Clone)]
-pub enum VsVers {
-    /// Visual Studio 12 (2013)
-    Vs12,
-    /// Visual Studio 14 (2015)
-    Vs14,
-    /// Visual Studio 15 (2017)
-    Vs15,
-    /// Visual Studio 16 (2019)
-    Vs16,
-
-    /// Hidden variant that should not be matched on. Callers that want to
-    /// handle an enumeration of `VsVers` instances should always have a default
-    /// case meaning that it's a VS version they don't understand.
-    #[doc(hidden)]
-    #[allow(bad_style)]
-    __Nonexhaustive_do_not_match_this_or_your_code_will_break,
-}
-
-/// Find the most recent installed version of Visual Studio
-///
-/// This is used by the cmake crate to figure out the correct
-/// generator.
-#[cfg(not(windows))]
-pub fn find_vs_version() -> Result<VsVers, String> {
-    Err(format!("not windows"))
-}
-
-/// Documented above
-#[cfg(windows)]
-pub fn find_vs_version() -> Result<VsVers, String> {
-    use std::env;
-
-    match env::var("VisualStudioVersion") {
-        Ok(version) => match &version[..] {
-            "16.0" => Ok(VsVers::Vs16),
-            "15.0" => Ok(VsVers::Vs15),
-            "14.0" => Ok(VsVers::Vs14),
-            "12.0" => Ok(VsVers::Vs12),
-            vers => Err(format!(
-                "\n\n\
-                 unsupported or unknown VisualStudio version: {}\n\
-                 if another version is installed consider running \
-                 the appropriate vcvars script before building this \
-                 crate\n\
-                 ",
-                vers
-            )),
-        },
-        _ => {
-            // Check for the presense of a specific registry key
-            // that indicates visual studio is installed.
-            if impl_::has_msbuild_version("16.0") {
-                Ok(VsVers::Vs16)
-            } else if impl_::has_msbuild_version("15.0") {
-                Ok(VsVers::Vs15)
-            } else if impl_::has_msbuild_version("14.0") {
-                Ok(VsVers::Vs14)
-            } else if impl_::has_msbuild_version("12.0") {
-                Ok(VsVers::Vs12)
-            } else {
-                Err(format!(
-                    "\n\n\
-                     couldn't determine visual studio generator\n\
-                     if VisualStudio is installed, however, consider \
-                     running the appropriate vcvars script before building \
-                     this crate\n\
-                     "
-                ))
-            }
-        }
-    }
-}
-
-#[cfg(windows)]
-mod impl_ {
-    use crate::com;
-    use crate::registry::{RegistryKey, LOCAL_MACHINE};
-    use crate::setup_config::{EnumSetupInstances, SetupConfiguration, SetupInstance};
-    use std::env;
-    use std::ffi::OsString;
-    use std::fs::File;
-    use std::io::Read;
-    use std::iter;
-    use std::mem;
-    use std::path::{Path, PathBuf};
-
-    use crate::Tool;
-
-    struct MsvcTool {
-        tool: PathBuf,
-        libs: Vec<PathBuf>,
-        path: Vec<PathBuf>,
-        include: Vec<PathBuf>,
-    }
-
-    impl MsvcTool {
-        fn new(tool: PathBuf) -> MsvcTool {
-            MsvcTool {
-                tool: tool,
-                libs: Vec::new(),
-                path: Vec::new(),
-                include: Vec::new(),
-            }
-        }
-
-        fn into_tool(self) -> Tool {
-            let MsvcTool {
-                tool,
-                libs,
-                path,
-                include,
-            } = self;
-            let mut tool = Tool::new(tool.into());
-            add_env(&mut tool, "LIB", libs);
-            add_env(&mut tool, "PATH", path);
-            add_env(&mut tool, "INCLUDE", include);
-            tool
-        }
-    }
-
-    #[allow(bare_trait_objects)]
-    fn vs16_instances() -> Box<Iterator<Item = PathBuf>> {
-        let instances = if let Some(instances) = vs15_instances() {
-            instances
-        } else {
-            return Box::new(iter::empty());
-        };
-        Box::new(instances.filter_map(|instance| {
-            let instance = instance.ok()?;
-            let installation_name = instance.installation_name().ok()?;
-            if installation_name.to_str()?.starts_with("VisualStudio/16.") {
-                Some(PathBuf::from(instance.installation_path().ok()?))
-            } else {
-                None
-            }
-        }))
-    }
-
-    fn find_tool_in_vs16_path(tool: &str, target: &str) -> Option<Tool> {
-        vs16_instances()
-            .filter_map(|path| {
-                let path = path.join(tool);
-                if !path.is_file() {
-                    return None;
-                }
-                let mut tool = Tool::new(path);
-                if target.contains("x86_64") {
-                    tool.env.push(("Platform".into(), "X64".into()));
-                }
-                Some(tool)
-            })
-            .next()
-    }
-
-    fn find_msbuild_vs16(target: &str) -> Option<Tool> {
-        find_tool_in_vs16_path(r"MSBuild\Current\Bin\MSBuild.exe", target)
-    }
-
-    // In MSVC 15 (2017) MS once again changed the scheme for locating
-    // the tooling.  Now we must go through some COM interfaces, which
-    // is super fun for Rust.
-    //
-    // Note that much of this logic can be found [online] wrt paths, COM, etc.
-    //
-    // [online]: https://blogs.msdn.microsoft.com/vcblog/2017/03/06/finding-the-visual-c-compiler-tools-in-visual-studio-2017/
-    fn vs15_instances() -> Option<EnumSetupInstances> {
-        com::initialize().ok()?;
-
-        let config = SetupConfiguration::new().ok()?;
-        config.enum_all_instances().ok()
-    }
-
-    pub fn find_msvc_15(tool: &str, target: &str) -> Option<Tool> {
-        let iter = vs15_instances()?;
-        for instance in iter {
-            let instance = instance.ok()?;
-            let tool = tool_from_vs15_instance(tool, target, &instance);
-            if tool.is_some() {
-                return tool;
-            }
-        }
-
-        None
-    }
-
-    // While the paths to Visual Studio 2017's devenv and MSBuild could
-    // potentially be retrieved from the registry, finding them via
-    // SetupConfiguration has shown to be [more reliable], and is preferred
-    // according to Microsoft. To help head off potential regressions though,
-    // we keep the registry method as a fallback option.
-    //
-    // [more reliable]: https://github.com/alexcrichton/cc-rs/pull/331
-    fn find_tool_in_vs15_path(tool: &str, target: &str) -> Option<Tool> {
-        let mut path = match vs15_instances() {
-            Some(instances) => instances
-                .filter_map(|instance| {
-                    instance
-                        .ok()
-                        .and_then(|instance| instance.installation_path().ok())
-                })
-                .map(|path| PathBuf::from(path).join(tool))
-                .find(|ref path| path.is_file()),
-            None => None,
-        };
-
-        if path.is_none() {
-            let key = r"SOFTWARE\WOW6432Node\Microsoft\VisualStudio\SxS\VS7";
-            path = LOCAL_MACHINE
-                .open(key.as_ref())
-                .ok()
-                .and_then(|key| key.query_str("15.0").ok())
-                .map(|path| PathBuf::from(path).join(tool))
-                .and_then(|path| if path.is_file() { Some(path) } else { None });
-        }
-
-        path.map(|path| {
-            let mut tool = Tool::new(path);
-            if target.contains("x86_64") {
-                tool.env.push(("Platform".into(), "X64".into()));
-            }
-            tool
-        })
-    }
-
-    fn tool_from_vs15_instance(tool: &str, target: &str, instance: &SetupInstance) -> Option<Tool> {
-        let (bin_path, host_dylib_path, lib_path, include_path) = vs15_vc_paths(target, instance)?;
-        let tool_path = bin_path.join(tool);
-        if !tool_path.exists() {
-            return None;
-        };
-
-        let mut tool = MsvcTool::new(tool_path);
-        tool.path.push(host_dylib_path);
-        tool.libs.push(lib_path);
-        tool.include.push(include_path);
-
-        if let Some((atl_lib_path, atl_include_path)) = atl_paths(target, &bin_path) {
-            tool.libs.push(atl_lib_path);
-            tool.include.push(atl_include_path);
-        }
-
-        add_sdks(&mut tool, target)?;
-
-        Some(tool.into_tool())
-    }
-
-    fn vs15_vc_paths(
-        target: &str,
-        instance: &SetupInstance,
-    ) -> Option<(PathBuf, PathBuf, PathBuf, PathBuf)> {
-        let instance_path: PathBuf = instance.installation_path().ok()?.into();
-        let version_path =
-            instance_path.join(r"VC\Auxiliary\Build\Microsoft.VCToolsVersion.default.txt");
-        let mut version_file = File::open(version_path).ok()?;
-        let mut version = String::new();
-        version_file.read_to_string(&mut version).ok()?;
-        let version = version.trim();
-        let host = match host_arch() {
-            X86 => "X86",
-            X86_64 => "X64",
-            _ => return None,
-        };
-        let target = lib_subdir(target)?;
-        // The directory layout here is MSVC/bin/Host$host/$target/
-        let path = instance_path.join(r"VC\Tools\MSVC").join(version);
-        // This is the path to the toolchain for a particular target, running
-        // on a given host
-        let bin_path = path
-            .join("bin")
-            .join(&format!("Host{}", host))
-            .join(&target);
-        // But! we also need PATH to contain the target directory for the host
-        // architecture, because it contains dlls like mspdb140.dll compiled for
-        // the host architecture.
-        let host_dylib_path = path
-            .join("bin")
-            .join(&format!("Host{}", host))
-            .join(&host.to_lowercase());
-        let lib_path = path.join("lib").join(&target);
-        let include_path = path.join("include");
-        Some((bin_path, host_dylib_path, lib_path, include_path))
-    }
-
-    fn atl_paths(target: &str, path: &Path) -> Option<(PathBuf, PathBuf)> {
-        let atl_path = path.join("atlfmc");
-        let sub = lib_subdir(target)?;
-        if atl_path.exists() {
-            Some((atl_path.join("lib").join(sub), atl_path.join("include")))
-        } else {
-            None
-        }
-    }
-
-    // For MSVC 14 we need to find the Universal CRT as well as either
-    // the Windows 10 SDK or Windows 8.1 SDK.
-    pub fn find_msvc_14(tool: &str, target: &str) -> Option<Tool> {
-        let vcdir = get_vc_dir("14.0")?;
-        let mut tool = get_tool(tool, &vcdir, target)?;
-        add_sdks(&mut tool, target)?;
-        Some(tool.into_tool())
-    }
-
-    fn add_sdks(tool: &mut MsvcTool, target: &str) -> Option<()> {
-        let sub = lib_subdir(target)?;
-        let (ucrt, ucrt_version) = get_ucrt_dir()?;
-
-        tool.path
-            .push(ucrt.join("bin").join(&ucrt_version).join(sub));
-
-        let ucrt_include = ucrt.join("include").join(&ucrt_version);
-        tool.include.push(ucrt_include.join("ucrt"));
-
-        let ucrt_lib = ucrt.join("lib").join(&ucrt_version);
-        tool.libs.push(ucrt_lib.join("ucrt").join(sub));
-
-        if let Some((sdk, version)) = get_sdk10_dir() {
-            tool.path.push(sdk.join("bin").join(sub));
-            let sdk_lib = sdk.join("lib").join(&version);
-            tool.libs.push(sdk_lib.join("um").join(sub));
-            let sdk_include = sdk.join("include").join(&version);
-            tool.include.push(sdk_include.join("um"));
-            tool.include.push(sdk_include.join("cppwinrt"));
-            tool.include.push(sdk_include.join("winrt"));
-            tool.include.push(sdk_include.join("shared"));
-        } else if let Some(sdk) = get_sdk81_dir() {
-            tool.path.push(sdk.join("bin").join(sub));
-            let sdk_lib = sdk.join("lib").join("winv6.3");
-            tool.libs.push(sdk_lib.join("um").join(sub));
-            let sdk_include = sdk.join("include");
-            tool.include.push(sdk_include.join("um"));
-            tool.include.push(sdk_include.join("winrt"));
-            tool.include.push(sdk_include.join("shared"));
-        }
-
-        Some(())
-    }
-
-    // For MSVC 12 we need to find the Windows 8.1 SDK.
-    pub fn find_msvc_12(tool: &str, target: &str) -> Option<Tool> {
-        let vcdir = get_vc_dir("12.0")?;
-        let mut tool = get_tool(tool, &vcdir, target)?;
-        let sub = lib_subdir(target)?;
-        let sdk81 = get_sdk81_dir()?;
-        tool.path.push(sdk81.join("bin").join(sub));
-        let sdk_lib = sdk81.join("lib").join("winv6.3");
-        tool.libs.push(sdk_lib.join("um").join(sub));
-        let sdk_include = sdk81.join("include");
-        tool.include.push(sdk_include.join("shared"));
-        tool.include.push(sdk_include.join("um"));
-        tool.include.push(sdk_include.join("winrt"));
-        Some(tool.into_tool())
-    }
-
-    // For MSVC 11 we need to find the Windows 8 SDK.
-    pub fn find_msvc_11(tool: &str, target: &str) -> Option<Tool> {
-        let vcdir = get_vc_dir("11.0")?;
-        let mut tool = get_tool(tool, &vcdir, target)?;
-        let sub = lib_subdir(target)?;
-        let sdk8 = get_sdk8_dir()?;
-        tool.path.push(sdk8.join("bin").join(sub));
-        let sdk_lib = sdk8.join("lib").join("win8");
-        tool.libs.push(sdk_lib.join("um").join(sub));
-        let sdk_include = sdk8.join("include");
-        tool.include.push(sdk_include.join("shared"));
-        tool.include.push(sdk_include.join("um"));
-        tool.include.push(sdk_include.join("winrt"));
-        Some(tool.into_tool())
-    }
-
-    fn add_env(tool: &mut Tool, env: &str, paths: Vec<PathBuf>) {
-        let prev = env::var_os(env).unwrap_or(OsString::new());
-        let prev = env::split_paths(&prev);
-        let new = paths.into_iter().chain(prev);
-        tool.env
-            .push((env.to_string().into(), env::join_paths(new).unwrap()));
-    }
-
-    // Given a possible MSVC installation directory, we look for the linker and
-    // then add the MSVC library path.
-    fn get_tool(tool: &str, path: &Path, target: &str) -> Option<MsvcTool> {
-        bin_subdir(target)
-            .into_iter()
-            .map(|(sub, host)| {
-                (
-                    path.join("bin").join(sub).join(tool),
-                    path.join("bin").join(host),
-                )
-            })
-            .filter(|&(ref path, _)| path.is_file())
-            .map(|(path, host)| {
-                let mut tool = MsvcTool::new(path);
-                tool.path.push(host);
-                tool
-            })
-            .filter_map(|mut tool| {
-                let sub = vc_lib_subdir(target)?;
-                tool.libs.push(path.join("lib").join(sub));
-                tool.include.push(path.join("include"));
-                let atlmfc_path = path.join("atlmfc");
-                if atlmfc_path.exists() {
-                    tool.libs.push(atlmfc_path.join("lib").join(sub));
-                    tool.include.push(atlmfc_path.join("include"));
-                }
-                Some(tool)
-            })
-            .next()
-    }
-
-    // To find MSVC we look in a specific registry key for the version we are
-    // trying to find.
-    fn get_vc_dir(ver: &str) -> Option<PathBuf> {
-        let key = r"SOFTWARE\Microsoft\VisualStudio\SxS\VC7";
-        let key = LOCAL_MACHINE.open(key.as_ref()).ok()?;
-        let path = key.query_str(ver).ok()?;
-        Some(path.into())
-    }
-
-    // To find the Universal CRT we look in a specific registry key for where
-    // all the Universal CRTs are located and then sort them asciibetically to
-    // find the newest version. While this sort of sorting isn't ideal,  it is
-    // what vcvars does so that's good enough for us.
-    //
-    // Returns a pair of (root, version) for the ucrt dir if found
-    fn get_ucrt_dir() -> Option<(PathBuf, String)> {
-        let key = r"SOFTWARE\Microsoft\Windows Kits\Installed Roots";
-        let key = LOCAL_MACHINE.open(key.as_ref()).ok()?;
-        let root = key.query_str("KitsRoot10").ok()?;
-        let readdir = Path::new(&root).join("lib").read_dir().ok()?;
-        let max_libdir = readdir
-            .filter_map(|dir| dir.ok())
-            .map(|dir| dir.path())
-            .filter(|dir| {
-                dir.components()
-                    .last()
-                    .and_then(|c| c.as_os_str().to_str())
-                    .map(|c| c.starts_with("10.") && dir.join("ucrt").is_dir())
-                    .unwrap_or(false)
-            })
-            .max()?;
-        let version = max_libdir.components().last().unwrap();
-        let version = version.as_os_str().to_str().unwrap().to_string();
-        Some((root.into(), version))
-    }
-
-    // Vcvars finds the correct version of the Windows 10 SDK by looking
-    // for the include `um\Windows.h` because sometimes a given version will
-    // only have UCRT bits without the rest of the SDK. Since we only care about
-    // libraries and not includes, we instead look for `um\x64\kernel32.lib`.
-    // Since the 32-bit and 64-bit libraries are always installed together we
-    // only need to bother checking x64, making this code a tiny bit simpler.
-    // Like we do for the Universal CRT, we sort the possibilities
-    // asciibetically to find the newest one as that is what vcvars does.
-    fn get_sdk10_dir() -> Option<(PathBuf, String)> {
-        let key = r"SOFTWARE\Microsoft\Microsoft SDKs\Windows\v10.0";
-        let key = LOCAL_MACHINE.open(key.as_ref()).ok()?;
-        let root = key.query_str("InstallationFolder").ok()?;
-        let readdir = Path::new(&root).join("lib").read_dir().ok()?;
-        let mut dirs = readdir
-            .filter_map(|dir| dir.ok())
-            .map(|dir| dir.path())
-            .collect::<Vec<_>>();
-        dirs.sort();
-        let dir = dirs
-            .into_iter()
-            .rev()
-            .filter(|dir| dir.join("um").join("x64").join("kernel32.lib").is_file())
-            .next()?;
-        let version = dir.components().last().unwrap();
-        let version = version.as_os_str().to_str().unwrap().to_string();
-        Some((root.into(), version))
-    }
-
-    // Interestingly there are several subdirectories, `win7` `win8` and
-    // `winv6.3`. Vcvars seems to only care about `winv6.3` though, so the same
-    // applies to us. Note that if we were targetting kernel mode drivers
-    // instead of user mode applications, we would care.
-    fn get_sdk81_dir() -> Option<PathBuf> {
-        let key = r"SOFTWARE\Microsoft\Microsoft SDKs\Windows\v8.1";
-        let key = LOCAL_MACHINE.open(key.as_ref()).ok()?;
-        let root = key.query_str("InstallationFolder").ok()?;
-        Some(root.into())
-    }
-
-    fn get_sdk8_dir() -> Option<PathBuf> {
-        let key = r"SOFTWARE\Microsoft\Microsoft SDKs\Windows\v8.0";
-        let key = LOCAL_MACHINE.open(key.as_ref()).ok()?;
-        let root = key.query_str("InstallationFolder").ok()?;
-        Some(root.into())
-    }
-
-    const PROCESSOR_ARCHITECTURE_INTEL: u16 = 0;
-    const PROCESSOR_ARCHITECTURE_AMD64: u16 = 9;
-    const X86: u16 = PROCESSOR_ARCHITECTURE_INTEL;
-    const X86_64: u16 = PROCESSOR_ARCHITECTURE_AMD64;
-
-    // When choosing the tool to use, we have to choose the one which matches
-    // the target architecture. Otherwise we end up in situations where someone
-    // on 32-bit Windows is trying to cross compile to 64-bit and it tries to
-    // invoke the native 64-bit compiler which won't work.
-    //
-    // For the return value of this function, the first member of the tuple is
-    // the folder of the tool we will be invoking, while the second member is
-    // the folder of the host toolchain for that tool which is essential when
-    // using a cross linker. We return a Vec since on x64 there are often two
-    // linkers that can target the architecture we desire. The 64-bit host
-    // linker is preferred, and hence first, due to 64-bit allowing it more
-    // address space to work with and potentially being faster.
-    fn bin_subdir(target: &str) -> Vec<(&'static str, &'static str)> {
-        let arch = target.split('-').next().unwrap();
-        match (arch, host_arch()) {
-            ("i586", X86) | ("i686", X86) => vec![("", "")],
-            ("i586", X86_64) | ("i686", X86_64) => vec![("amd64_x86", "amd64"), ("", "")],
-            ("x86_64", X86) => vec![("x86_amd64", "")],
-            ("x86_64", X86_64) => vec![("amd64", "amd64"), ("x86_amd64", "")],
-            ("arm", X86) | ("thumbv7a", X86) => vec![("x86_arm", "")],
-            ("arm", X86_64) | ("thumbv7a", X86_64) => vec![("amd64_arm", "amd64"), ("x86_arm", "")],
-            _ => vec![],
-        }
-    }
-
-    fn lib_subdir(target: &str) -> Option<&'static str> {
-        let arch = target.split('-').next().unwrap();
-        match arch {
-            "i586" | "i686" => Some("x86"),
-            "x86_64" => Some("x64"),
-            "arm" | "thumbv7a" => Some("arm"),
-            "aarch64" => Some("arm64"),
-            _ => None,
-        }
-    }
-
-    // MSVC's x86 libraries are not in a subfolder
-    fn vc_lib_subdir(target: &str) -> Option<&'static str> {
-        let arch = target.split('-').next().unwrap();
-        match arch {
-            "i586" | "i686" => Some(""),
-            "x86_64" => Some("amd64"),
-            "arm" | "thumbv7a" => Some("arm"),
-            "aarch64" => Some("arm64"),
-            _ => None,
-        }
-    }
-
-    #[allow(bad_style)]
-    fn host_arch() -> u16 {
-        type DWORD = u32;
-        type WORD = u16;
-        type LPVOID = *mut u8;
-        type DWORD_PTR = usize;
-
-        #[repr(C)]
-        struct SYSTEM_INFO {
-            wProcessorArchitecture: WORD,
-            _wReserved: WORD,
-            _dwPageSize: DWORD,
-            _lpMinimumApplicationAddress: LPVOID,
-            _lpMaximumApplicationAddress: LPVOID,
-            _dwActiveProcessorMask: DWORD_PTR,
-            _dwNumberOfProcessors: DWORD,
-            _dwProcessorType: DWORD,
-            _dwAllocationGranularity: DWORD,
-            _wProcessorLevel: WORD,
-            _wProcessorRevision: WORD,
-        }
-
-        extern "system" {
-            fn GetNativeSystemInfo(lpSystemInfo: *mut SYSTEM_INFO);
-        }
-
-        unsafe {
-            let mut info = mem::zeroed();
-            GetNativeSystemInfo(&mut info);
-            info.wProcessorArchitecture
-        }
-    }
-
-    // Given a registry key, look at all the sub keys and find the one which has
-    // the maximal numeric value.
-    //
-    // Returns the name of the maximal key as well as the opened maximal key.
-    fn max_version(key: &RegistryKey) -> Option<(OsString, RegistryKey)> {
-        let mut max_vers = 0;
-        let mut max_key = None;
-        for subkey in key.iter().filter_map(|k| k.ok()) {
-            let val = subkey
-                .to_str()
-                .and_then(|s| s.trim_left_matches("v").replace(".", "").parse().ok());
-            let val = match val {
-                Some(s) => s,
-                None => continue,
-            };
-            if val > max_vers {
-                if let Ok(k) = key.open(&subkey) {
-                    max_vers = val;
-                    max_key = Some((subkey, k));
-                }
-            }
-        }
-        max_key
-    }
-
-    pub fn has_msbuild_version(version: &str) -> bool {
-        match version {
-            "16.0" => {
-                find_msbuild_vs16("x86_64-pc-windows-msvc").is_some()
-                    || find_msbuild_vs16("i686-pc-windows-msvc").is_some()
-            }
-            "15.0" => {
-                find_msbuild_vs15("x86_64-pc-windows-msvc").is_some()
-                    || find_msbuild_vs15("i686-pc-windows-msvc").is_some()
-            }
-            "12.0" | "14.0" => LOCAL_MACHINE
-                .open(&OsString::from(format!(
-                    "SOFTWARE\\Microsoft\\MSBuild\\ToolsVersions\\{}",
-                    version
-                )))
-                .is_ok(),
-            _ => false,
-        }
-    }
-
-    pub fn find_devenv(target: &str) -> Option<Tool> {
-        find_devenv_vs15(&target)
-    }
-
-    fn find_devenv_vs15(target: &str) -> Option<Tool> {
-        find_tool_in_vs15_path(r"Common7\IDE\devenv.exe", target)
-    }
-
-    // see http://stackoverflow.com/questions/328017/path-to-msbuild
-    pub fn find_msbuild(target: &str) -> Option<Tool> {
-        // VS 15 (2017) changed how to locate msbuild
-        if let Some(r) = find_msbuild_vs16(target) {
-            return Some(r);
-        } else if let Some(r) = find_msbuild_vs15(target) {
-            return Some(r);
-        } else {
-            find_old_msbuild(target)
-        }
-    }
-
-    fn find_msbuild_vs15(target: &str) -> Option<Tool> {
-        find_tool_in_vs15_path(r"MSBuild\15.0\Bin\MSBuild.exe", target)
-    }
-
-    fn find_old_msbuild(target: &str) -> Option<Tool> {
-        let key = r"SOFTWARE\Microsoft\MSBuild\ToolsVersions";
-        LOCAL_MACHINE
-            .open(key.as_ref())
-            .ok()
-            .and_then(|key| {
-                max_version(&key).and_then(|(_vers, key)| key.query_str("MSBuildToolsPath").ok())
-            })
-            .map(|path| {
-                let mut path = PathBuf::from(path);
-                path.push("MSBuild.exe");
-                let mut tool = Tool::new(path);
-                if target.contains("x86_64") {
-                    tool.env.push(("Platform".into(), "X64".into()));
-                }
-                tool
-            })
-    }
-}