Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 1260 insertions, 0 deletions

diff --git a/vendor/cmake/.cargo-checksum.json b/vendor/cmake/.cargo-checksum.json
new file mode 100644
index 000000000..142773768
--- /dev/null
+++ b/vendor/cmake/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"Cargo.toml":"f8aceca8cee9d63df3fe9cad0c87ce69db0e9f0fbf6bce631631d10a53f59fd8","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"378f5840b258e2779c39418f3f2d7b2ba96f1c7917dd6be0713f88305dbda397","README.md":"a4ad0b734acb4d50db72782207587552c5e33c52500318c202776cd32dbdea4a","src/lib.rs":"1008a89e71ac2646e65aa5e6c3f7a84f5d8f78c0360c56000daaae731398121a"},"package":"e8ad8cef104ac57b68b89df3208164d228503abbdce70f6880ffa3d970e7443a"}
\ No newline at end of file
diff --git a/vendor/cmake/Cargo.toml b/vendor/cmake/Cargo.toml
new file mode 100644
index 000000000..c7640c41e
--- /dev/null
+++ b/vendor/cmake/Cargo.toml
@@ -0,0 +1,25 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+name = "cmake"
+version = "0.1.48"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+description = "A build dependency for running `cmake` to build a native library\n"
+homepage = "https://github.com/alexcrichton/cmake-rs"
+documentation = "https://docs.rs/cmake"
+readme = "README.md"
+keywords = ["build-dependencies"]
+categories = ["development-tools::build-utils"]
+license = "MIT/Apache-2.0"
+repository = "https://github.com/alexcrichton/cmake-rs"
+[dependencies.cc]
+version = "1.0.72"
diff --git a/vendor/cmake/LICENSE-APACHE b/vendor/cmake/LICENSE-APACHE
new file mode 100644
index 000000000..16fe87b06
--- /dev/null
+++ b/vendor/cmake/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+   "License" shall mean the terms and conditions for use, reproduction,
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+   the terms of any separate license agreement you may have executed
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+6. Trademarks. This License does not grant permission to use the trade
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+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
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+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
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+   file or class name and description of purpose be included on the
+   same "printed page" as the copyright notice for easier
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+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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diff --git a/vendor/cmake/LICENSE-MIT b/vendor/cmake/LICENSE-MIT
new file mode 100644
index 000000000..39e0ed660
--- /dev/null
+++ b/vendor/cmake/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2014 Alex Crichton
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/vendor/cmake/README.md b/vendor/cmake/README.md
new file mode 100644
index 000000000..7ef49ca02
--- /dev/null
+++ b/vendor/cmake/README.md
@@ -0,0 +1,32 @@
+# cmake
+
+[Documentation](https://docs.rs/cmake)
+
+A build dependency for running the `cmake` build tool to compile a native
+library.
+
+```toml
+# Cargo.toml
+[build-dependencies]
+cmake = "0.1"
+```
+
+The CMake executable is assumed to be `cmake` unless the `CMAKE`
+environmental variable is set.
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in cmake by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
diff --git a/vendor/cmake/src/lib.rs b/vendor/cmake/src/lib.rs
new file mode 100644
index 000000000..18c2fdcff
--- /dev/null
+++ b/vendor/cmake/src/lib.rs
@@ -0,0 +1,976 @@
+//! A build dependency for running `cmake` to build a native library
+//!
+//! This crate provides some necessary boilerplate and shim support for running
+//! the system `cmake` command to build a native library. It will add
+//! appropriate cflags for building code to link into Rust, handle cross
+//! compilation, and use the necessary generator for the platform being
+//! targeted.
+//!
+//! The builder-style configuration allows for various variables and such to be
+//! passed down into the build as well.
+//!
+//! ## Installation
+//!
+//! Add this to your `Cargo.toml`:
+//!
+//! ```toml
+//! [build-dependencies]
+//! cmake = "0.1"
+//! ```
+//!
+//! ## Examples
+//!
+//! ```no_run
+//! use cmake;
+//!
+//! // Builds the project in the directory located in `libfoo`, installing it
+//! // into $OUT_DIR
+//! let dst = cmake::build("libfoo");
+//!
+//! println!("cargo:rustc-link-search=native={}", dst.display());
+//! println!("cargo:rustc-link-lib=static=foo");
+//! ```
+//!
+//! ```no_run
+//! use cmake::Config;
+//!
+//! let dst = Config::new("libfoo")
+//!                  .define("FOO", "BAR")
+//!                  .cflag("-foo")
+//!                  .build();
+//! println!("cargo:rustc-link-search=native={}", dst.display());
+//! println!("cargo:rustc-link-lib=static=foo");
+//! ```
+
+#![deny(missing_docs)]
+
+extern crate cc;
+
+use std::collections::HashMap;
+use std::env;
+use std::ffi::{OsStr, OsString};
+use std::fs::{self, File};
+use std::io::prelude::*;
+use std::io::ErrorKind;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+/// Builder style configuration for a pending CMake build.
+pub struct Config {
+    path: PathBuf,
+    generator: Option<OsString>,
+    generator_toolset: Option<OsString>,
+    cflags: OsString,
+    cxxflags: OsString,
+    asmflags: OsString,
+    defines: Vec<(OsString, OsString)>,
+    deps: Vec<String>,
+    target: Option<String>,
+    host: Option<String>,
+    out_dir: Option<PathBuf>,
+    profile: Option<String>,
+    configure_args: Vec<OsString>,
+    build_args: Vec<OsString>,
+    cmake_target: Option<String>,
+    env: Vec<(OsString, OsString)>,
+    static_crt: Option<bool>,
+    uses_cxx11: bool,
+    always_configure: bool,
+    no_build_target: bool,
+    verbose_cmake: bool,
+    verbose_make: bool,
+    pic: Option<bool>,
+    c_cfg: Option<cc::Build>,
+    cxx_cfg: Option<cc::Build>,
+    env_cache: HashMap<String, Option<OsString>>,
+}
+
+/// Builds the native library rooted at `path` with the default cmake options.
+/// This will return the directory in which the library was installed.
+///
+/// # Examples
+///
+/// ```no_run
+/// use cmake;
+///
+/// // Builds the project in the directory located in `libfoo`, installing it
+/// // into $OUT_DIR
+/// let dst = cmake::build("libfoo");
+///
+/// println!("cargo:rustc-link-search=native={}", dst.display());
+/// println!("cargo:rustc-link-lib=static=foo");
+/// ```
+///
+pub fn build<P: AsRef<Path>>(path: P) -> PathBuf {
+    Config::new(path.as_ref()).build()
+}
+
+impl Config {
+    /// Return explicitly set profile or infer `CMAKE_BUILD_TYPE` from Rust's compilation profile.
+    ///
+    /// * if `opt-level=0` then `CMAKE_BUILD_TYPE=Debug`,
+    /// * if `opt-level={1,2,3}` and:
+    ///   * `debug=false` then `CMAKE_BUILD_TYPE=Release`
+    ///   * otherwise `CMAKE_BUILD_TYPE=RelWithDebInfo`
+    /// * if `opt-level={s,z}` then `CMAKE_BUILD_TYPE=MinSizeRel`
+    pub fn get_profile(&self) -> &str {
+        if let Some(profile) = self.profile.as_ref() {
+            profile
+        } else {
+            // Determine Rust's profile, optimization level, and debug info:
+            #[derive(PartialEq)]
+            enum RustProfile {
+                Debug,
+                Release,
+            }
+            #[derive(PartialEq, Debug)]
+            enum OptLevel {
+                Debug,
+                Release,
+                Size,
+            }
+
+            let rust_profile = match &getenv_unwrap("PROFILE")[..] {
+                "debug" => RustProfile::Debug,
+                "release" | "bench" => RustProfile::Release,
+                unknown => {
+                    eprintln!(
+                        "Warning: unknown Rust profile={}; defaulting to a release build.",
+                        unknown
+                    );
+                    RustProfile::Release
+                }
+            };
+
+            let opt_level = match &getenv_unwrap("OPT_LEVEL")[..] {
+                "0" => OptLevel::Debug,
+                "1" | "2" | "3" => OptLevel::Release,
+                "s" | "z" => OptLevel::Size,
+                unknown => {
+                    let default_opt_level = match rust_profile {
+                        RustProfile::Debug => OptLevel::Debug,
+                        RustProfile::Release => OptLevel::Release,
+                    };
+                    eprintln!(
+                        "Warning: unknown opt-level={}; defaulting to a {:?} build.",
+                        unknown, default_opt_level
+                    );
+                    default_opt_level
+                }
+            };
+
+            let debug_info: bool = match &getenv_unwrap("DEBUG")[..] {
+                "false" => false,
+                "true" => true,
+                unknown => {
+                    eprintln!("Warning: unknown debug={}; defaulting to `true`.", unknown);
+                    true
+                }
+            };
+
+            match (opt_level, debug_info) {
+                (OptLevel::Debug, _) => "Debug",
+                (OptLevel::Release, false) => "Release",
+                (OptLevel::Release, true) => "RelWithDebInfo",
+                (OptLevel::Size, _) => "MinSizeRel",
+            }
+        }
+    }
+
+    /// Creates a new blank set of configuration to build the project specified
+    /// at the path `path`.
+    pub fn new<P: AsRef<Path>>(path: P) -> Config {
+        Config {
+            path: env::current_dir().unwrap().join(path),
+            generator: None,
+            generator_toolset: None,
+            cflags: OsString::new(),
+            cxxflags: OsString::new(),
+            asmflags: OsString::new(),
+            defines: Vec::new(),
+            deps: Vec::new(),
+            profile: None,
+            out_dir: None,
+            target: None,
+            host: None,
+            configure_args: Vec::new(),
+            build_args: Vec::new(),
+            cmake_target: None,
+            env: Vec::new(),
+            static_crt: None,
+            uses_cxx11: false,
+            always_configure: true,
+            no_build_target: false,
+            verbose_cmake: false,
+            verbose_make: false,
+            pic: None,
+            c_cfg: None,
+            cxx_cfg: None,
+            env_cache: HashMap::new(),
+        }
+    }
+
+    /// Sets flag for PIC. Otherwise use cc::Build platform default
+    pub fn pic(&mut self, explicit_flag: bool) -> &mut Config {
+        self.pic = Some(explicit_flag);
+        self
+    }
+
+    /// Sets the build-tool generator (`-G`) for this compilation.
+    ///
+    /// If unset, this crate will use the `CMAKE_GENERATOR` environment variable
+    /// if set. Otherwise, it will guess the best generator to use based on the
+    /// build target.
+    pub fn generator<T: AsRef<OsStr>>(&mut self, generator: T) -> &mut Config {
+        self.generator = Some(generator.as_ref().to_owned());
+        self
+    }
+
+    /// Sets the toolset name (-T) if supported by generator.
+    /// Can be used to compile with CLang/LLV instead of msvc when Visual Studio generator is selected.
+    ///
+    /// If unset, will use the default toolset of the selected generator.
+    pub fn generator_toolset<T: AsRef<OsStr>>(&mut self, toolset_name: T) -> &mut Config {
+        self.generator_toolset = Some(toolset_name.as_ref().to_owned());
+        self
+    }
+
+    /// Adds a custom flag to pass down to the C compiler, supplementing those
+    /// that this library already passes.
+    pub fn cflag<P: AsRef<OsStr>>(&mut self, flag: P) -> &mut Config {
+        self.cflags.push(" ");
+        self.cflags.push(flag.as_ref());
+        self
+    }
+
+    /// Adds a custom flag to pass down to the C++ compiler, supplementing those
+    /// that this library already passes.
+    pub fn cxxflag<P: AsRef<OsStr>>(&mut self, flag: P) -> &mut Config {
+        self.cxxflags.push(" ");
+        self.cxxflags.push(flag.as_ref());
+        self
+    }
+
+    /// Adds a custom flag to pass down to the ASM compiler, supplementing those
+    /// that this library already passes.
+    pub fn asmflag<P: AsRef<OsStr>>(&mut self, flag: P) -> &mut Config {
+        self.asmflags.push(" ");
+        self.asmflags.push(flag.as_ref());
+        self
+    }
+
+    /// Adds a new `-D` flag to pass to cmake during the generation step.
+    pub fn define<K, V>(&mut self, k: K, v: V) -> &mut Config
+    where
+        K: AsRef<OsStr>,
+        V: AsRef<OsStr>,
+    {
+        self.defines
+            .push((k.as_ref().to_owned(), v.as_ref().to_owned()));
+        self
+    }
+
+    /// Registers a dependency for this compilation on the native library built
+    /// by Cargo previously.
+    ///
+    /// This registration will modify the `CMAKE_PREFIX_PATH` environment
+    /// variable for the build system generation step.
+    pub fn register_dep(&mut self, dep: &str) -> &mut Config {
+        self.deps.push(dep.to_string());
+        self
+    }
+
+    /// Sets the target triple for this compilation.
+    ///
+    /// This is automatically scraped from `$TARGET` which is set for Cargo
+    /// build scripts so it's not necessary to call this from a build script.
+    pub fn target(&mut self, target: &str) -> &mut Config {
+        self.target = Some(target.to_string());
+        self
+    }
+
+    /// Disables the cmake target option for this compilation.
+    ///
+    /// Note that this isn't related to the target triple passed to the compiler!
+    pub fn no_build_target(&mut self, no_build_target: bool) -> &mut Config {
+        self.no_build_target = no_build_target;
+        self
+    }
+
+    /// Sets the host triple for this compilation.
+    ///
+    /// This is automatically scraped from `$HOST` which is set for Cargo
+    /// build scripts so it's not necessary to call this from a build script.
+    pub fn host(&mut self, host: &str) -> &mut Config {
+        self.host = Some(host.to_string());
+        self
+    }
+
+    /// Sets the output directory for this compilation.
+    ///
+    /// This is automatically scraped from `$OUT_DIR` which is set for Cargo
+    /// build scripts so it's not necessary to call this from a build script.
+    pub fn out_dir<P: AsRef<Path>>(&mut self, out: P) -> &mut Config {
+        self.out_dir = Some(out.as_ref().to_path_buf());
+        self
+    }
+
+    /// Sets the `CMAKE_BUILD_TYPE=build_type` variable.
+    ///
+    /// By default, this value is automatically inferred from Rust's compilation
+    /// profile as follows:
+    ///
+    /// * if `opt-level=0` then `CMAKE_BUILD_TYPE=Debug`,
+    /// * if `opt-level={1,2,3}` and:
+    ///   * `debug=false` then `CMAKE_BUILD_TYPE=Release`
+    ///   * otherwise `CMAKE_BUILD_TYPE=RelWithDebInfo`
+    /// * if `opt-level={s,z}` then `CMAKE_BUILD_TYPE=MinSizeRel`
+    pub fn profile(&mut self, profile: &str) -> &mut Config {
+        self.profile = Some(profile.to_string());
+        self
+    }
+
+    /// Configures whether the /MT flag or the /MD flag will be passed to msvc build tools.
+    ///
+    /// This option defaults to `false`, and affect only msvc targets.
+    pub fn static_crt(&mut self, static_crt: bool) -> &mut Config {
+        self.static_crt = Some(static_crt);
+        self
+    }
+
+    /// Add an argument to the `cmake` configure step
+    pub fn configure_arg<A: AsRef<OsStr>>(&mut self, arg: A) -> &mut Config {
+        self.configure_args.push(arg.as_ref().to_owned());
+        self
+    }
+
+    /// Add an argument to the final `cmake` build step
+    pub fn build_arg<A: AsRef<OsStr>>(&mut self, arg: A) -> &mut Config {
+        self.build_args.push(arg.as_ref().to_owned());
+        self
+    }
+
+    /// Configure an environment variable for the `cmake` processes spawned by
+    /// this crate in the `build` step.
+    pub fn env<K, V>(&mut self, key: K, value: V) -> &mut Config
+    where
+        K: AsRef<OsStr>,
+        V: AsRef<OsStr>,
+    {
+        self.env
+            .push((key.as_ref().to_owned(), value.as_ref().to_owned()));
+        self
+    }
+
+    /// Sets the build target for the final `cmake` build step, this will
+    /// default to "install" if not specified.
+    pub fn build_target(&mut self, target: &str) -> &mut Config {
+        self.cmake_target = Some(target.to_string());
+        self
+    }
+
+    /// Alters the default target triple on OSX to ensure that c++11 is
+    /// available. Does not change the target triple if it is explicitly
+    /// specified.
+    ///
+    /// This does not otherwise affect any CXX flags, i.e. it does not set
+    /// -std=c++11 or -stdlib=libc++.
+    pub fn uses_cxx11(&mut self) -> &mut Config {
+        self.uses_cxx11 = true;
+        self
+    }
+
+    /// Forces CMake to always run before building the custom target.
+    ///
+    /// In some cases, when you have a big project, you can disable
+    /// subsequents runs of cmake to make `cargo build` faster.
+    pub fn always_configure(&mut self, always_configure: bool) -> &mut Config {
+        self.always_configure = always_configure;
+        self
+    }
+
+    /// Sets very verbose output.
+    pub fn very_verbose(&mut self, value: bool) -> &mut Config {
+        self.verbose_cmake = value;
+        self.verbose_make = value;
+        self
+    }
+
+    // Simple heuristic to determine if we're cross-compiling using the Android
+    // NDK toolchain file.
+    fn uses_android_ndk(&self) -> bool {
+        // `ANDROID_ABI` is the only required flag:
+        // https://developer.android.com/ndk/guides/cmake#android_abi
+        self.defined("ANDROID_ABI")
+            && self.defines.iter().any(|(flag, value)| {
+                flag == "CMAKE_TOOLCHAIN_FILE"
+                    && Path::new(value).file_name() == Some("android.toolchain.cmake".as_ref())
+            })
+    }
+
+    /// Initializes the C build configuration.
+    pub fn init_c_cfg(&mut self, c_cfg: cc::Build) -> &mut Config {
+        self.c_cfg = Some(c_cfg);
+        self
+    }
+
+    /// Initializes the C++ build configuration.
+    pub fn init_cxx_cfg(&mut self, cxx_cfg: cc::Build) -> &mut Config {
+        self.cxx_cfg = Some(cxx_cfg);
+        self
+    }
+
+    /// Run this configuration, compiling the library with all the configured
+    /// options.
+    ///
+    /// This will run both the build system generator command as well as the
+    /// command to build the library.
+    pub fn build(&mut self) -> PathBuf {
+        let target = match self.target.clone() {
+            Some(t) => t,
+            None => {
+                let mut t = getenv_unwrap("TARGET");
+                if t.ends_with("-darwin") && self.uses_cxx11 {
+                    t = t + "11"
+                }
+                t
+            }
+        };
+        let host = self.host.clone().unwrap_or_else(|| getenv_unwrap("HOST"));
+
+        // Some decisions later on are made if CMAKE_TOOLCHAIN_FILE is defined,
+        // so we need to read it from the environment variables from the beginning.
+        if !self.defined("CMAKE_TOOLCHAIN_FILE") {
+            if let Some(s) = self.getenv_target_os("CMAKE_TOOLCHAIN_FILE") {
+                self.define("CMAKE_TOOLCHAIN_FILE", s);
+            }
+        }
+
+        let generator = self
+            .generator
+            .clone()
+            .or_else(|| self.getenv_target_os("CMAKE_GENERATOR"));
+
+        let msvc = target.contains("msvc");
+        let ndk = self.uses_android_ndk();
+        let mut c_cfg = self.c_cfg.clone().unwrap_or_default();
+        c_cfg
+            .cargo_metadata(false)
+            .cpp(false)
+            .opt_level(0)
+            .debug(false)
+            .warnings(false)
+            .host(&host)
+            .no_default_flags(ndk);
+        if !ndk {
+            c_cfg.target(&target);
+        }
+        let mut cxx_cfg = self.cxx_cfg.clone().unwrap_or_default();
+        cxx_cfg
+            .cargo_metadata(false)
+            .cpp(true)
+            .opt_level(0)
+            .debug(false)
+            .warnings(false)
+            .host(&host)
+            .no_default_flags(ndk);
+        if !ndk {
+            cxx_cfg.target(&target);
+        }
+        if let Some(static_crt) = self.static_crt {
+            c_cfg.static_crt(static_crt);
+            cxx_cfg.static_crt(static_crt);
+        }
+        if let Some(explicit_flag) = self.pic {
+            c_cfg.pic(explicit_flag);
+            cxx_cfg.pic(explicit_flag);
+        }
+        let c_compiler = c_cfg.get_compiler();
+        let cxx_compiler = cxx_cfg.get_compiler();
+        let asm_compiler = c_cfg.get_compiler();
+
+        let dst = self
+            .out_dir
+            .clone()
+            .unwrap_or_else(|| PathBuf::from(getenv_unwrap("OUT_DIR")));
+        let build = dst.join("build");
+        self.maybe_clear(&build);
+        let _ = fs::create_dir(&build);
+
+        // Add all our dependencies to our cmake paths
+        let mut cmake_prefix_path = Vec::new();
+        for dep in &self.deps {
+            let dep = dep.to_uppercase().replace('-', "_");
+            if let Some(root) = env::var_os(&format!("DEP_{}_ROOT", dep)) {
+                cmake_prefix_path.push(PathBuf::from(root));
+            }
+        }
+        let system_prefix = self
+            .getenv_target_os("CMAKE_PREFIX_PATH")
+            .unwrap_or(OsString::new());
+        cmake_prefix_path.extend(env::split_paths(&system_prefix).map(|s| s.to_owned()));
+        let cmake_prefix_path = env::join_paths(&cmake_prefix_path).unwrap();
+
+        // Build up the first cmake command to build the build system.
+        let executable = self
+            .getenv_target_os("CMAKE")
+            .unwrap_or(OsString::from("cmake"));
+        let mut cmd = Command::new(&executable);
+
+        if self.verbose_cmake {
+            cmd.arg("-Wdev");
+            cmd.arg("--debug-output");
+        }
+
+        cmd.arg(&self.path).current_dir(&build);
+        let mut is_ninja = false;
+        if let Some(ref generator) = generator {
+            is_ninja = generator.to_string_lossy().contains("Ninja");
+        }
+        if target.contains("windows-gnu") {
+            if host.contains("windows") {
+                // On MinGW we need to coerce cmake to not generate a visual
+                // studio build system but instead use makefiles that MinGW can
+                // use to build.
+                if generator.is_none() {
+                    // If make.exe isn't found, that means we may be using a MinGW
+                    // toolchain instead of a MSYS2 toolchain. If neither is found,
+                    // the build cannot continue.
+                    let has_msys2 = Command::new("make")
+                        .arg("--version")
+                        .output()
+                        .err()
+                        .map(|e| e.kind() != ErrorKind::NotFound)
+                        .unwrap_or(true);
+                    let has_mingw32 = Command::new("mingw32-make")
+                        .arg("--version")
+                        .output()
+                        .err()
+                        .map(|e| e.kind() != ErrorKind::NotFound)
+                        .unwrap_or(true);
+
+                    let generator = match (has_msys2, has_mingw32) {
+                        (true, _) => "MSYS Makefiles",
+                        (false, true) => "MinGW Makefiles",
+                        (false, false) => fail("no valid generator found for GNU toolchain; MSYS or MinGW must be installed")
+                    };
+
+                    cmd.arg("-G").arg(generator);
+                }
+            } else {
+                // If we're cross compiling onto windows, then set some
+                // variables which will hopefully get things to succeed. Some
+                // systems may need the `windres` or `dlltool` variables set, so
+                // set them if possible.
+                if !self.defined("CMAKE_SYSTEM_NAME") {
+                    cmd.arg("-DCMAKE_SYSTEM_NAME=Windows");
+                }
+                if !self.defined("CMAKE_RC_COMPILER") {
+                    let exe = find_exe(c_compiler.path());
+                    if let Some(name) = exe.file_name().unwrap().to_str() {
+                        let name = name.replace("gcc", "windres");
+                        let windres = exe.with_file_name(name);
+                        if windres.is_file() {
+                            let mut arg = OsString::from("-DCMAKE_RC_COMPILER=");
+                            arg.push(&windres);
+                            cmd.arg(arg);
+                        }
+                    }
+                }
+            }
+        } else if msvc {
+            // If we're on MSVC we need to be sure to use the right generator or
+            // otherwise we won't get 32/64 bit correct automatically.
+            // This also guarantees that NMake generator isn't chosen implicitly.
+            let using_nmake_generator;
+            if generator.is_none() {
+                cmd.arg("-G").arg(self.visual_studio_generator(&target));
+                using_nmake_generator = false;
+            } else {
+                using_nmake_generator = generator.as_ref().unwrap() == "NMake Makefiles";
+            }
+            if !is_ninja && !using_nmake_generator {
+                if target.contains("x86_64") {
+                    if self.generator_toolset.is_none() {
+                        cmd.arg("-Thost=x64");
+                    }
+                    cmd.arg("-Ax64");
+                } else if target.contains("thumbv7a") {
+                    if self.generator_toolset.is_none() {
+                        cmd.arg("-Thost=x64");
+                    }
+                    cmd.arg("-Aarm");
+                } else if target.contains("aarch64") {
+                    if self.generator_toolset.is_none() {
+                        cmd.arg("-Thost=x64");
+                    }
+                    cmd.arg("-AARM64");
+                } else if target.contains("i686") {
+                    use cc::windows_registry::{find_vs_version, VsVers};
+                    match find_vs_version() {
+                        Ok(VsVers::Vs16) => {
+                            // 32-bit x86 toolset used to be the default for all hosts,
+                            // but Visual Studio 2019 changed the default toolset to match the host,
+                            // so we need to manually override it for x86 targets
+                            if self.generator_toolset.is_none() {
+                                cmd.arg("-Thost=x86");
+                            }
+                            cmd.arg("-AWin32");
+                        }
+                        _ => {}
+                    };
+                } else {
+                    panic!("unsupported msvc target: {}", target);
+                }
+            }
+        } else if target.contains("redox") {
+            if !self.defined("CMAKE_SYSTEM_NAME") {
+                cmd.arg("-DCMAKE_SYSTEM_NAME=Generic");
+            }
+        } else if target.contains("solaris") {
+            if !self.defined("CMAKE_SYSTEM_NAME") {
+                cmd.arg("-DCMAKE_SYSTEM_NAME=SunOS");
+            }
+        } else if target.contains("apple-ios") || target.contains("apple-tvos") {
+            // These two flags prevent CMake from adding an OSX sysroot, which messes up compilation.
+            if !self.defined("CMAKE_OSX_SYSROOT") && !self.defined("CMAKE_OSX_DEPLOYMENT_TARGET") {
+                cmd.arg("-DCMAKE_OSX_SYSROOT=/");
+                cmd.arg("-DCMAKE_OSX_DEPLOYMENT_TARGET=");
+            }
+        }
+        if let Some(ref generator) = generator {
+            cmd.arg("-G").arg(generator);
+        }
+        if let Some(ref generator_toolset) = self.generator_toolset {
+            cmd.arg("-T").arg(generator_toolset);
+        }
+        let profile = self.get_profile().to_string();
+        for &(ref k, ref v) in &self.defines {
+            let mut os = OsString::from("-D");
+            os.push(k);
+            os.push("=");
+            os.push(v);
+            cmd.arg(os);
+        }
+
+        if !self.defined("CMAKE_INSTALL_PREFIX") {
+            let mut dstflag = OsString::from("-DCMAKE_INSTALL_PREFIX=");
+            dstflag.push(&dst);
+            cmd.arg(dstflag);
+        }
+
+        let build_type = self
+            .defines
+            .iter()
+            .find(|&&(ref a, _)| a == "CMAKE_BUILD_TYPE")
+            .map(|x| x.1.to_str().unwrap())
+            .unwrap_or(&profile);
+        let build_type_upcase = build_type
+            .chars()
+            .flat_map(|c| c.to_uppercase())
+            .collect::<String>();
+
+        {
+            // let cmake deal with optimization/debuginfo
+            let skip_arg = |arg: &OsStr| match arg.to_str() {
+                Some(s) => s.starts_with("-O") || s.starts_with("/O") || s == "-g",
+                None => false,
+            };
+            let mut set_compiler = |kind: &str, compiler: &cc::Tool, extra: &OsString| {
+                let flag_var = format!("CMAKE_{}_FLAGS", kind);
+                let tool_var = format!("CMAKE_{}_COMPILER", kind);
+                if !self.defined(&flag_var) {
+                    let mut flagsflag = OsString::from("-D");
+                    flagsflag.push(&flag_var);
+                    flagsflag.push("=");
+                    flagsflag.push(extra);
+                    for arg in compiler.args() {
+                        if skip_arg(arg) {
+                            continue;
+                        }
+                        flagsflag.push(" ");
+                        flagsflag.push(arg);
+                    }
+                    cmd.arg(flagsflag);
+                }
+
+                // The visual studio generator apparently doesn't respect
+                // `CMAKE_C_FLAGS` but does respect `CMAKE_C_FLAGS_RELEASE` and
+                // such. We need to communicate /MD vs /MT, so set those vars
+                // here.
+                //
+                // Note that for other generators, though, this *overrides*
+                // things like the optimization flags, which is bad.
+                if generator.is_none() && msvc {
+                    let flag_var_alt = format!("CMAKE_{}_FLAGS_{}", kind, build_type_upcase);
+                    if !self.defined(&flag_var_alt) {
+                        let mut flagsflag = OsString::from("-D");
+                        flagsflag.push(&flag_var_alt);
+                        flagsflag.push("=");
+                        flagsflag.push(extra);
+                        for arg in compiler.args() {
+                            if skip_arg(arg) {
+                                continue;
+                            }
+                            flagsflag.push(" ");
+                            flagsflag.push(arg);
+                        }
+                        cmd.arg(flagsflag);
+                    }
+                }
+
+                // Apparently cmake likes to have an absolute path to the
+                // compiler as otherwise it sometimes thinks that this variable
+                // changed as it thinks the found compiler, /usr/bin/cc,
+                // differs from the specified compiler, cc. Not entirely sure
+                // what's up, but at least this means cmake doesn't get
+                // confused?
+                //
+                // Also specify this on Windows only if we use MSVC with Ninja,
+                // as it's not needed for MSVC with Visual Studio generators and
+                // for MinGW it doesn't really vary.
+                if !self.defined("CMAKE_TOOLCHAIN_FILE")
+                    && !self.defined(&tool_var)
+                    && (env::consts::FAMILY != "windows" || (msvc && is_ninja))
+                {
+                    let mut ccompiler = OsString::from("-D");
+                    ccompiler.push(&tool_var);
+                    ccompiler.push("=");
+                    ccompiler.push(find_exe(compiler.path()));
+                    #[cfg(windows)]
+                    {
+                        // CMake doesn't like unescaped `\`s in compiler paths
+                        // so we either have to escape them or replace with `/`s.
+                        use std::os::windows::ffi::{OsStrExt, OsStringExt};
+                        let wchars = ccompiler
+                            .encode_wide()
+                            .map(|wchar| {
+                                if wchar == b'\\' as u16 {
+                                    '/' as u16
+                                } else {
+                                    wchar
+                                }
+                            })
+                            .collect::<Vec<_>>();
+                        ccompiler = OsString::from_wide(&wchars);
+                    }
+                    cmd.arg(ccompiler);
+                }
+            };
+
+            set_compiler("C", &c_compiler, &self.cflags);
+            set_compiler("CXX", &cxx_compiler, &self.cxxflags);
+            set_compiler("ASM", &asm_compiler, &self.asmflags);
+        }
+
+        if !self.defined("CMAKE_BUILD_TYPE") {
+            cmd.arg(&format!("-DCMAKE_BUILD_TYPE={}", profile));
+        }
+
+        if self.verbose_make {
+            cmd.arg("-DCMAKE_VERBOSE_MAKEFILE:BOOL=ON");
+        }
+
+        for &(ref k, ref v) in c_compiler.env().iter().chain(&self.env) {
+            cmd.env(k, v);
+        }
+
+        if self.always_configure || !build.join("CMakeCache.txt").exists() {
+            cmd.args(&self.configure_args);
+            run(cmd.env("CMAKE_PREFIX_PATH", cmake_prefix_path), "cmake");
+        } else {
+            println!("CMake project was already configured. Skipping configuration step.");
+        }
+
+        // And build!
+        let target = self.cmake_target.clone().unwrap_or("install".to_string());
+        let mut cmd = Command::new(&executable);
+        cmd.current_dir(&build);
+
+        for &(ref k, ref v) in c_compiler.env().iter().chain(&self.env) {
+            cmd.env(k, v);
+        }
+
+        // If the generated project is Makefile based we should carefully transfer corresponding CARGO_MAKEFLAGS
+        if fs::metadata(&build.join("Makefile")).is_ok() {
+            match env::var_os("CARGO_MAKEFLAGS") {
+                // Only do this on non-windows and non-bsd
+                // On Windows, we could be invoking make instead of
+                // mingw32-make which doesn't work with our jobserver
+                // bsdmake also does not work with our job server
+                Some(ref makeflags)
+                    if !(cfg!(windows)
+                        || cfg!(target_os = "openbsd")
+                        || cfg!(target_os = "netbsd")
+                        || cfg!(target_os = "freebsd")
+                        || cfg!(target_os = "bitrig")
+                        || cfg!(target_os = "dragonflybsd")) =>
+                {
+                    cmd.env("MAKEFLAGS", makeflags);
+                }
+                _ => {}
+            }
+        }
+
+        cmd.arg("--build").arg(".");
+
+        if !self.no_build_target {
+            cmd.arg("--target").arg(target);
+        }
+
+        cmd.arg("--config").arg(&profile);
+
+        if let Ok(s) = env::var("NUM_JOBS") {
+            // See https://cmake.org/cmake/help/v3.12/manual/cmake.1.html#build-tool-mode
+            cmd.arg("--parallel").arg(s);
+        }
+
+        if !&self.build_args.is_empty() {
+            cmd.arg("--").args(&self.build_args);
+        }
+
+        run(&mut cmd, "cmake");
+
+        println!("cargo:root={}", dst.display());
+        return dst;
+    }
+
+    fn getenv_os(&mut self, v: &str) -> Option<OsString> {
+        if let Some(val) = self.env_cache.get(v) {
+            return val.clone();
+        }
+        let r = env::var_os(v);
+        println!("{} = {:?}", v, r);
+        self.env_cache.insert(v.to_string(), r.clone());
+        r
+    }
+
+    /// Gets a target-specific environment variable.
+    fn getenv_target_os(&mut self, var_base: &str) -> Option<OsString> {
+        let host = self.host.clone().unwrap_or_else(|| getenv_unwrap("HOST"));
+        let target = self
+            .target
+            .clone()
+            .unwrap_or_else(|| getenv_unwrap("TARGET"));
+
+        let kind = if host == target { "HOST" } else { "TARGET" };
+        let target_u = target.replace("-", "_");
+        self.getenv_os(&format!("{}_{}", var_base, target))
+            .or_else(|| self.getenv_os(&format!("{}_{}", var_base, target_u)))
+            .or_else(|| self.getenv_os(&format!("{}_{}", kind, var_base)))
+            .or_else(|| self.getenv_os(var_base))
+    }
+
+    fn visual_studio_generator(&self, target: &str) -> String {
+        use cc::windows_registry::{find_vs_version, VsVers};
+
+        let base = match find_vs_version() {
+            Ok(VsVers::Vs17) => "Visual Studio 17 2022",
+            Ok(VsVers::Vs16) => "Visual Studio 16 2019",
+            Ok(VsVers::Vs15) => "Visual Studio 15 2017",
+            Ok(VsVers::Vs14) => "Visual Studio 14 2015",
+            Ok(VsVers::Vs12) => "Visual Studio 12 2013",
+            Ok(_) => panic!(
+                "Visual studio version detected but this crate \
+                 doesn't know how to generate cmake files for it, \
+                 can the `cmake` crate be updated?"
+            ),
+            Err(msg) => panic!("{}", msg),
+        };
+        if ["i686", "x86_64", "thumbv7a", "aarch64"]
+            .iter()
+            .any(|t| target.contains(t))
+        {
+            base.to_string()
+        } else {
+            panic!("unsupported msvc target: {}", target);
+        }
+    }
+
+    fn defined(&self, var: &str) -> bool {
+        self.defines.iter().any(|&(ref a, _)| a == var)
+    }
+
+    // If a cmake project has previously been built (e.g. CMakeCache.txt already
+    // exists), then cmake will choke if the source directory for the original
+    // project being built has changed. Detect this situation through the
+    // `CMAKE_HOME_DIRECTORY` variable that cmake emits and if it doesn't match
+    // we blow away the build directory and start from scratch (the recommended
+    // solution apparently [1]).
+    //
+    // [1]: https://cmake.org/pipermail/cmake/2012-August/051545.html
+    fn maybe_clear(&self, dir: &Path) {
+        // CMake will apparently store canonicalized paths which normally
+        // isn't relevant to us but we canonicalize it here to ensure
+        // we're both checking the same thing.
+        let path = fs::canonicalize(&self.path).unwrap_or(self.path.clone());
+        let mut f = match File::open(dir.join("CMakeCache.txt")) {
+            Ok(f) => f,
+            Err(..) => return,
+        };
+        let mut u8contents = Vec::new();
+        match f.read_to_end(&mut u8contents) {
+            Ok(f) => f,
+            Err(..) => return,
+        };
+        let contents = String::from_utf8_lossy(&u8contents);
+        drop(f);
+        for line in contents.lines() {
+            if line.starts_with("CMAKE_HOME_DIRECTORY") {
+                let needs_cleanup = match line.split('=').next_back() {
+                    Some(cmake_home) => fs::canonicalize(cmake_home)
+                        .ok()
+                        .map(|cmake_home| cmake_home != path)
+                        .unwrap_or(true),
+                    None => true,
+                };
+                if needs_cleanup {
+                    println!(
+                        "detected home dir change, cleaning out entire build \
+                         directory"
+                    );
+                    fs::remove_dir_all(dir).unwrap();
+                }
+                break;
+            }
+        }
+    }
+}
+
+fn run(cmd: &mut Command, program: &str) {
+    println!("running: {:?}", cmd);
+    let status = match cmd.status() {
+        Ok(status) => status,
+        Err(ref e) if e.kind() == ErrorKind::NotFound => {
+            fail(&format!(
+                "failed to execute command: {}\nis `{}` not installed?",
+                e, program
+            ));
+        }
+        Err(e) => fail(&format!("failed to execute command: {}", e)),
+    };
+    if !status.success() {
+        fail(&format!(
+            "command did not execute successfully, got: {}",
+            status
+        ));
+    }
+}
+
+fn find_exe(path: &Path) -> PathBuf {
+    env::split_paths(&env::var_os("PATH").unwrap_or(OsString::new()))
+        .map(|p| p.join(path))
+        .find(|p| fs::metadata(p).is_ok())
+        .unwrap_or(path.to_owned())
+}
+
+fn getenv_unwrap(v: &str) -> String {
+    match env::var(v) {
+        Ok(s) => s,
+        Err(..) => fail(&format!("environment variable `{}` not defined", v)),
+    }
+}
+
+fn fail(s: &str) -> ! {
+    panic!("\n{}\n\nbuild script failed, must exit now", s)
+}