Merging upstream version 1.75.0+dfsg1.

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

1 files changed, 0 insertions, 1357 deletions

diff --git a/src/bootstrap/llvm.rs b/src/bootstrap/llvm.rs
deleted file mode 100644
index 455683158..000000000
--- a/src/bootstrap/llvm.rs
+++ /dev/null
@@ -1,1357 +0,0 @@
-//! Compilation of native dependencies like LLVM.
-//!
-//! Native projects like LLVM unfortunately aren't suited just yet for
-//! compilation in build scripts that Cargo has. This is because the
-//! compilation takes a *very* long time but also because we don't want to
-//! compile LLVM 3 times as part of a normal bootstrap (we want it cached).
-//!
-//! LLVM and compiler-rt are essentially just wired up to everything else to
-//! ensure that they're always in place if needed.
-
-use std::env;
-use std::env::consts::EXE_EXTENSION;
-use std::ffi::{OsStr, OsString};
-use std::fs::{self, File};
-use std::io;
-use std::path::{Path, PathBuf};
-use std::process::Command;
-
-use crate::builder::{Builder, RunConfig, ShouldRun, Step};
-use crate::channel;
-use crate::config::{Config, TargetSelection};
-use crate::util::get_clang_cl_resource_dir;
-use crate::util::{self, exe, output, t, up_to_date};
-use crate::{CLang, GitRepo, Kind};
-
-use build_helper::ci::CiEnv;
-use build_helper::git::get_git_merge_base;
-
-#[derive(Clone)]
-pub struct LlvmResult {
-    /// Path to llvm-config binary.
-    /// NB: This is always the host llvm-config!
-    pub llvm_config: PathBuf,
-    /// Path to LLVM cmake directory for the target.
-    pub llvm_cmake_dir: PathBuf,
-}
-
-pub struct Meta {
-    stamp: HashStamp,
-    res: LlvmResult,
-    out_dir: PathBuf,
-    root: String,
-}
-
-// Linker flags to pass to LLVM's CMake invocation.
-#[derive(Debug, Clone, Default)]
-struct LdFlags {
-    // CMAKE_EXE_LINKER_FLAGS
-    exe: OsString,
-    // CMAKE_SHARED_LINKER_FLAGS
-    shared: OsString,
-    // CMAKE_MODULE_LINKER_FLAGS
-    module: OsString,
-}
-
-impl LdFlags {
-    fn push_all(&mut self, s: impl AsRef<OsStr>) {
-        let s = s.as_ref();
-        self.exe.push(" ");
-        self.exe.push(s);
-        self.shared.push(" ");
-        self.shared.push(s);
-        self.module.push(" ");
-        self.module.push(s);
-    }
-}
-
-/// This returns whether we've already previously built LLVM.
-///
-/// It's used to avoid busting caches during x.py check -- if we've already built
-/// LLVM, it's fine for us to not try to avoid doing so.
-///
-/// This will return the llvm-config if it can get it (but it will not build it
-/// if not).
-pub fn prebuilt_llvm_config(
-    builder: &Builder<'_>,
-    target: TargetSelection,
-) -> Result<LlvmResult, Meta> {
-    builder.config.maybe_download_ci_llvm();
-
-    // If we're using a custom LLVM bail out here, but we can only use a
-    // custom LLVM for the build triple.
-    if let Some(config) = builder.config.target_config.get(&target) {
-        if let Some(ref s) = config.llvm_config {
-            check_llvm_version(builder, s);
-            let llvm_config = s.to_path_buf();
-            let mut llvm_cmake_dir = llvm_config.clone();
-            llvm_cmake_dir.pop();
-            llvm_cmake_dir.pop();
-            llvm_cmake_dir.push("lib");
-            llvm_cmake_dir.push("cmake");
-            llvm_cmake_dir.push("llvm");
-            return Ok(LlvmResult { llvm_config, llvm_cmake_dir });
-        }
-    }
-
-    let root = "src/llvm-project/llvm";
-    let out_dir = builder.llvm_out(target);
-
-    let mut llvm_config_ret_dir = builder.llvm_out(builder.config.build);
-    if !builder.config.build.contains("msvc") || builder.ninja() {
-        llvm_config_ret_dir.push("build");
-    }
-    llvm_config_ret_dir.push("bin");
-    let build_llvm_config = llvm_config_ret_dir.join(exe("llvm-config", builder.config.build));
-    let llvm_cmake_dir = out_dir.join("lib/cmake/llvm");
-    let res = LlvmResult { llvm_config: build_llvm_config, llvm_cmake_dir };
-
-    let stamp = out_dir.join("llvm-finished-building");
-    let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
-
-    if stamp.is_done() {
-        if stamp.hash.is_none() {
-            builder.info(
-                "Could not determine the LLVM submodule commit hash. \
-                     Assuming that an LLVM rebuild is not necessary.",
-            );
-            builder.info(&format!(
-                "To force LLVM to rebuild, remove the file `{}`",
-                stamp.path.display()
-            ));
-        }
-        return Ok(res);
-    }
-
-    Err(Meta { stamp, res, out_dir, root: root.into() })
-}
-
-/// This retrieves the LLVM sha we *want* to use, according to git history.
-pub(crate) fn detect_llvm_sha(config: &Config, is_git: bool) -> String {
-    let llvm_sha = if is_git {
-        // We proceed in 2 steps. First we get the closest commit that is actually upstream. Then we
-        // walk back further to the last bors merge commit that actually changed LLVM. The first
-        // step will fail on CI because only the `auto` branch exists; we just fall back to `HEAD`
-        // in that case.
-        let closest_upstream =
-            get_git_merge_base(Some(&config.src)).unwrap_or_else(|_| "HEAD".into());
-        let mut rev_list = config.git();
-        rev_list.args(&[
-            PathBuf::from("rev-list"),
-            format!("--author={}", config.stage0_metadata.config.git_merge_commit_email).into(),
-            "-n1".into(),
-            "--first-parent".into(),
-            closest_upstream.into(),
-            "--".into(),
-            config.src.join("src/llvm-project"),
-            config.src.join("src/bootstrap/download-ci-llvm-stamp"),
-            // the LLVM shared object file is named `LLVM-12-rust-{version}-nightly`
-            config.src.join("src/version"),
-        ]);
-        output(&mut rev_list).trim().to_owned()
-    } else if let Some(info) = channel::read_commit_info_file(&config.src) {
-        info.sha.trim().to_owned()
-    } else {
-        "".to_owned()
-    };
-
-    if llvm_sha.is_empty() {
-        eprintln!("error: could not find commit hash for downloading LLVM");
-        eprintln!("help: maybe your repository history is too shallow?");
-        eprintln!("help: consider disabling `download-ci-llvm`");
-        eprintln!("help: or fetch enough history to include one upstream commit");
-        panic!();
-    }
-
-    llvm_sha
-}
-
-/// Returns whether the CI-found LLVM is currently usable.
-///
-/// This checks both the build triple platform to confirm we're usable at all,
-/// and then verifies if the current HEAD matches the detected LLVM SHA head,
-/// in which case LLVM is indicated as not available.
-pub(crate) fn is_ci_llvm_available(config: &Config, asserts: bool) -> bool {
-    // This is currently all tier 1 targets and tier 2 targets with host tools
-    // (since others may not have CI artifacts)
-    // https://doc.rust-lang.org/rustc/platform-support.html#tier-1
-    let supported_platforms = [
-        // tier 1
-        ("aarch64-unknown-linux-gnu", false),
-        ("i686-pc-windows-gnu", false),
-        ("i686-pc-windows-msvc", false),
-        ("i686-unknown-linux-gnu", false),
-        ("x86_64-unknown-linux-gnu", true),
-        ("x86_64-apple-darwin", true),
-        ("x86_64-pc-windows-gnu", true),
-        ("x86_64-pc-windows-msvc", true),
-        // tier 2 with host tools
-        ("aarch64-apple-darwin", false),
-        ("aarch64-pc-windows-msvc", false),
-        ("aarch64-unknown-linux-musl", false),
-        ("arm-unknown-linux-gnueabi", false),
-        ("arm-unknown-linux-gnueabihf", false),
-        ("armv7-unknown-linux-gnueabihf", false),
-        ("loongarch64-unknown-linux-gnu", false),
-        ("mips-unknown-linux-gnu", false),
-        ("mips64-unknown-linux-gnuabi64", false),
-        ("mips64el-unknown-linux-gnuabi64", false),
-        ("mipsel-unknown-linux-gnu", false),
-        ("powerpc-unknown-linux-gnu", false),
-        ("powerpc64-unknown-linux-gnu", false),
-        ("powerpc64le-unknown-linux-gnu", false),
-        ("riscv64gc-unknown-linux-gnu", false),
-        ("s390x-unknown-linux-gnu", false),
-        ("x86_64-unknown-freebsd", false),
-        ("x86_64-unknown-illumos", false),
-        ("x86_64-unknown-linux-musl", false),
-        ("x86_64-unknown-netbsd", false),
-    ];
-
-    if !supported_platforms.contains(&(&*config.build.triple, asserts))
-        && (asserts || !supported_platforms.contains(&(&*config.build.triple, true)))
-    {
-        return false;
-    }
-
-    if is_ci_llvm_modified(config) {
-        eprintln!("Detected LLVM as non-available: running in CI and modified LLVM in this change");
-        return false;
-    }
-
-    true
-}
-
-/// Returns true if we're running in CI with modified LLVM (and thus can't download it)
-pub(crate) fn is_ci_llvm_modified(config: &Config) -> bool {
-    CiEnv::is_ci() && config.rust_info.is_managed_git_subrepository() && {
-        // We assume we have access to git, so it's okay to unconditionally pass
-        // `true` here.
-        let llvm_sha = detect_llvm_sha(config, true);
-        let head_sha = output(config.git().arg("rev-parse").arg("HEAD"));
-        let head_sha = head_sha.trim();
-        llvm_sha == head_sha
-    }
-}
-
-#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
-pub struct Llvm {
-    pub target: TargetSelection,
-}
-
-impl Step for Llvm {
-    type Output = LlvmResult;
-
-    const ONLY_HOSTS: bool = true;
-
-    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.path("src/llvm-project").path("src/llvm-project/llvm")
-    }
-
-    fn make_run(run: RunConfig<'_>) {
-        run.builder.ensure(Llvm { target: run.target });
-    }
-
-    /// Compile LLVM for `target`.
-    fn run(self, builder: &Builder<'_>) -> LlvmResult {
-        let target = self.target;
-        let target_native = if self.target.starts_with("riscv") {
-            // RISC-V target triples in Rust is not named the same as C compiler target triples.
-            // This converts Rust RISC-V target triples to C compiler triples.
-            let idx = target.triple.find('-').unwrap();
-
-            format!("riscv{}{}", &target.triple[5..7], &target.triple[idx..])
-        } else if self.target.starts_with("powerpc") && self.target.ends_with("freebsd") {
-            // FreeBSD 13 had incompatible ABI changes on all PowerPC platforms.
-            // Set the version suffix to 13.0 so the correct target details are used.
-            format!("{}{}", self.target, "13.0")
-        } else {
-            target.to_string()
-        };
-
-        let Meta { stamp, res, out_dir, root } = match prebuilt_llvm_config(builder, target) {
-            Ok(p) => return p,
-            Err(m) => m,
-        };
-
-        builder.update_submodule(&Path::new("src").join("llvm-project"));
-        if builder.llvm_link_shared() && target.contains("windows") {
-            panic!("shared linking to LLVM is not currently supported on {}", target.triple);
-        }
-
-        let _guard = builder.msg_unstaged(Kind::Build, "LLVM", target);
-        t!(stamp.remove());
-        let _time = util::timeit(&builder);
-        t!(fs::create_dir_all(&out_dir));
-
-        // https://llvm.org/docs/CMake.html
-        let mut cfg = cmake::Config::new(builder.src.join(root));
-        let mut ldflags = LdFlags::default();
-
-        let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
-            (false, _) => "Debug",
-            (true, false) => "Release",
-            (true, true) => "RelWithDebInfo",
-        };
-
-        // NOTE: remember to also update `config.example.toml` when changing the
-        // defaults!
-        let llvm_targets = match &builder.config.llvm_targets {
-            Some(s) => s,
-            None => {
-                "AArch64;ARM;BPF;Hexagon;LoongArch;MSP430;Mips;NVPTX;PowerPC;RISCV;\
-                     Sparc;SystemZ;WebAssembly;X86"
-            }
-        };
-
-        let llvm_exp_targets = match builder.config.llvm_experimental_targets {
-            Some(ref s) => s,
-            None => "AVR;M68k;CSKY",
-        };
-
-        let assertions = if builder.config.llvm_assertions { "ON" } else { "OFF" };
-        let plugins = if builder.config.llvm_plugins { "ON" } else { "OFF" };
-        let enable_tests = if builder.config.llvm_tests { "ON" } else { "OFF" };
-        let enable_warnings = if builder.config.llvm_enable_warnings { "ON" } else { "OFF" };
-
-        cfg.out_dir(&out_dir)
-            .profile(profile)
-            .define("LLVM_ENABLE_ASSERTIONS", assertions)
-            .define("LLVM_UNREACHABLE_OPTIMIZE", "OFF")
-            .define("LLVM_ENABLE_PLUGINS", plugins)
-            .define("LLVM_TARGETS_TO_BUILD", llvm_targets)
-            .define("LLVM_EXPERIMENTAL_TARGETS_TO_BUILD", llvm_exp_targets)
-            .define("LLVM_INCLUDE_EXAMPLES", "OFF")
-            .define("LLVM_INCLUDE_DOCS", "OFF")
-            .define("LLVM_INCLUDE_BENCHMARKS", "OFF")
-            .define("LLVM_INCLUDE_TESTS", enable_tests)
-            .define("LLVM_ENABLE_TERMINFO", "OFF")
-            .define("LLVM_ENABLE_LIBEDIT", "OFF")
-            .define("LLVM_ENABLE_BINDINGS", "OFF")
-            .define("LLVM_ENABLE_Z3_SOLVER", "OFF")
-            .define("LLVM_PARALLEL_COMPILE_JOBS", builder.jobs().to_string())
-            .define("LLVM_TARGET_ARCH", target_native.split('-').next().unwrap())
-            .define("LLVM_DEFAULT_TARGET_TRIPLE", target_native)
-            .define("LLVM_ENABLE_WARNINGS", enable_warnings);
-
-        // Parts of our test suite rely on the `FileCheck` tool, which is built by default in
-        // `build/$TARGET/llvm/build/bin` is but *not* then installed to `build/$TARGET/llvm/bin`.
-        // This flag makes sure `FileCheck` is copied in the final binaries directory.
-        cfg.define("LLVM_INSTALL_UTILS", "ON");
-
-        if builder.config.llvm_profile_generate {
-            cfg.define("LLVM_BUILD_INSTRUMENTED", "IR");
-            if let Ok(llvm_profile_dir) = std::env::var("LLVM_PROFILE_DIR") {
-                cfg.define("LLVM_PROFILE_DATA_DIR", llvm_profile_dir);
-            }
-            cfg.define("LLVM_BUILD_RUNTIME", "No");
-        }
-        if let Some(path) = builder.config.llvm_profile_use.as_ref() {
-            cfg.define("LLVM_PROFDATA_FILE", &path);
-        }
-
-        // Disable zstd to avoid a dependency on libzstd.so.
-        cfg.define("LLVM_ENABLE_ZSTD", "OFF");
-
-        if !target.contains("windows") {
-            cfg.define("LLVM_ENABLE_ZLIB", "ON");
-        } else {
-            cfg.define("LLVM_ENABLE_ZLIB", "OFF");
-        }
-
-        // Are we compiling for iOS/tvOS/watchOS?
-        if target.contains("apple-ios")
-            || target.contains("apple-tvos")
-            || target.contains("apple-watchos")
-        {
-            // These two defines prevent CMake from automatically trying to add a MacOSX sysroot, which leads to a compiler error.
-            cfg.define("CMAKE_OSX_SYSROOT", "/");
-            cfg.define("CMAKE_OSX_DEPLOYMENT_TARGET", "");
-            // Prevent cmake from adding -bundle to CFLAGS automatically, which leads to a compiler error because "-bitcode_bundle" also gets added.
-            cfg.define("LLVM_ENABLE_PLUGINS", "OFF");
-            // Zlib fails to link properly, leading to a compiler error.
-            cfg.define("LLVM_ENABLE_ZLIB", "OFF");
-        }
-
-        // This setting makes the LLVM tools link to the dynamic LLVM library,
-        // which saves both memory during parallel links and overall disk space
-        // for the tools. We don't do this on every platform as it doesn't work
-        // equally well everywhere.
-        if builder.llvm_link_shared() {
-            cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
-        }
-
-        if (target.starts_with("riscv") || target.starts_with("csky"))
-            && !target.contains("freebsd")
-            && !target.contains("openbsd")
-            && !target.contains("netbsd")
-        {
-            // RISC-V and CSKY GCC erroneously requires linking against
-            // `libatomic` when using 1-byte and 2-byte C++
-            // atomics but the LLVM build system check cannot
-            // detect this. Therefore it is set manually here.
-            // Some BSD uses Clang as its system compiler and
-            // provides no libatomic in its base system so does
-            // not want this.
-            ldflags.exe.push(" -latomic");
-            ldflags.shared.push(" -latomic");
-        }
-
-        if target.contains("msvc") {
-            cfg.define("LLVM_USE_CRT_DEBUG", "MT");
-            cfg.define("LLVM_USE_CRT_RELEASE", "MT");
-            cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
-            cfg.static_crt(true);
-        }
-
-        if target.starts_with("i686") {
-            cfg.define("LLVM_BUILD_32_BITS", "ON");
-        }
-
-        let mut enabled_llvm_projects = Vec::new();
-
-        if util::forcing_clang_based_tests() {
-            enabled_llvm_projects.push("clang");
-            enabled_llvm_projects.push("compiler-rt");
-        }
-
-        if builder.config.llvm_polly {
-            enabled_llvm_projects.push("polly");
-        }
-
-        if builder.config.llvm_clang {
-            enabled_llvm_projects.push("clang");
-        }
-
-        // We want libxml to be disabled.
-        // See https://github.com/rust-lang/rust/pull/50104
-        cfg.define("LLVM_ENABLE_LIBXML2", "OFF");
-
-        if !enabled_llvm_projects.is_empty() {
-            enabled_llvm_projects.sort();
-            enabled_llvm_projects.dedup();
-            cfg.define("LLVM_ENABLE_PROJECTS", enabled_llvm_projects.join(";"));
-        }
-
-        if let Some(num_linkers) = builder.config.llvm_link_jobs {
-            if num_linkers > 0 {
-                cfg.define("LLVM_PARALLEL_LINK_JOBS", num_linkers.to_string());
-            }
-        }
-
-        // https://llvm.org/docs/HowToCrossCompileLLVM.html
-        if target != builder.config.build {
-            let LlvmResult { llvm_config, .. } =
-                builder.ensure(Llvm { target: builder.config.build });
-            if !builder.config.dry_run() {
-                let llvm_bindir = output(Command::new(&llvm_config).arg("--bindir"));
-                let host_bin = Path::new(llvm_bindir.trim());
-                cfg.define(
-                    "LLVM_TABLEGEN",
-                    host_bin.join("llvm-tblgen").with_extension(EXE_EXTENSION),
-                );
-                // LLVM_NM is required for cross compiling using MSVC
-                cfg.define("LLVM_NM", host_bin.join("llvm-nm").with_extension(EXE_EXTENSION));
-            }
-            cfg.define("LLVM_CONFIG_PATH", llvm_config);
-            if builder.config.llvm_clang {
-                let build_bin = builder.llvm_out(builder.config.build).join("build").join("bin");
-                let clang_tblgen = build_bin.join("clang-tblgen").with_extension(EXE_EXTENSION);
-                if !builder.config.dry_run() && !clang_tblgen.exists() {
-                    panic!("unable to find {}", clang_tblgen.display());
-                }
-                cfg.define("CLANG_TABLEGEN", clang_tblgen);
-            }
-        }
-
-        let llvm_version_suffix = if let Some(ref suffix) = builder.config.llvm_version_suffix {
-            // Allow version-suffix="" to not define a version suffix at all.
-            if !suffix.is_empty() { Some(suffix.to_string()) } else { None }
-        } else if builder.config.channel == "dev" {
-            // Changes to a version suffix require a complete rebuild of the LLVM.
-            // To avoid rebuilds during a time of version bump, don't include rustc
-            // release number on the dev channel.
-            Some("-rust-dev".to_string())
-        } else {
-            Some(format!("-rust-{}-{}", builder.version, builder.config.channel))
-        };
-        if let Some(ref suffix) = llvm_version_suffix {
-            cfg.define("LLVM_VERSION_SUFFIX", suffix);
-        }
-
-        configure_cmake(builder, target, &mut cfg, true, ldflags, &[]);
-        configure_llvm(builder, target, &mut cfg);
-
-        for (key, val) in &builder.config.llvm_build_config {
-            cfg.define(key, val);
-        }
-
-        if builder.config.dry_run() {
-            return res;
-        }
-
-        cfg.build();
-
-        // Helper to find the name of LLVM's shared library on darwin and linux.
-        let find_llvm_lib_name = |extension| {
-            let mut cmd = Command::new(&res.llvm_config);
-            let version = output(cmd.arg("--version"));
-            let major = version.split('.').next().unwrap();
-
-            match &llvm_version_suffix {
-                Some(version_suffix) => format!("libLLVM-{major}{version_suffix}.{extension}"),
-                None => format!("libLLVM-{major}.{extension}"),
-            }
-        };
-
-        // When building LLVM with LLVM_LINK_LLVM_DYLIB for macOS, an unversioned
-        // libLLVM.dylib will be built. However, llvm-config will still look
-        // for a versioned path like libLLVM-14.dylib. Manually create a symbolic
-        // link to make llvm-config happy.
-        if builder.llvm_link_shared() && target.contains("apple-darwin") {
-            let lib_name = find_llvm_lib_name("dylib");
-            let lib_llvm = out_dir.join("build").join("lib").join(lib_name);
-            if !lib_llvm.exists() {
-                t!(builder.symlink_file("libLLVM.dylib", &lib_llvm));
-            }
-        }
-
-        // When building LLVM as a shared library on linux, it can contain unexpected debuginfo:
-        // some can come from the C++ standard library. Unless we're explicitly requesting LLVM to
-        // be built with debuginfo, strip it away after the fact, to make dist artifacts smaller.
-        if builder.llvm_link_shared()
-            && builder.config.llvm_optimize
-            && !builder.config.llvm_release_debuginfo
-        {
-            // Find the name of the LLVM shared library that we just built.
-            let lib_name = find_llvm_lib_name("so");
-
-            // If the shared library exists in LLVM's `/build/lib/` or `/lib/` folders, strip its
-            // debuginfo.
-            crate::compile::strip_debug(builder, target, &out_dir.join("lib").join(&lib_name));
-            crate::compile::strip_debug(
-                builder,
-                target,
-                &out_dir.join("build").join("lib").join(&lib_name),
-            );
-        }
-
-        t!(stamp.write());
-
-        res
-    }
-}
-
-fn check_llvm_version(builder: &Builder<'_>, llvm_config: &Path) {
-    if builder.config.dry_run() {
-        return;
-    }
-
-    let mut cmd = Command::new(llvm_config);
-    let version = output(cmd.arg("--version"));
-    let mut parts = version.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
-    if let (Some(major), Some(_minor)) = (parts.next(), parts.next()) {
-        if major >= 15 {
-            return;
-        }
-    }
-    panic!("\n\nbad LLVM version: {version}, need >=15.0\n\n")
-}
-
-fn configure_cmake(
-    builder: &Builder<'_>,
-    target: TargetSelection,
-    cfg: &mut cmake::Config,
-    use_compiler_launcher: bool,
-    mut ldflags: LdFlags,
-    extra_compiler_flags: &[&str],
-) {
-    // Do not print installation messages for up-to-date files.
-    // LLVM and LLD builds can produce a lot of those and hit CI limits on log size.
-    cfg.define("CMAKE_INSTALL_MESSAGE", "LAZY");
-
-    // Do not allow the user's value of DESTDIR to influence where
-    // LLVM will install itself. LLVM must always be installed in our
-    // own build directories.
-    cfg.env("DESTDIR", "");
-
-    if builder.ninja() {
-        cfg.generator("Ninja");
-    }
-    cfg.target(&target.triple).host(&builder.config.build.triple);
-
-    if target != builder.config.build {
-        cfg.define("CMAKE_CROSSCOMPILING", "True");
-
-        if target.contains("netbsd") {
-            cfg.define("CMAKE_SYSTEM_NAME", "NetBSD");
-        } else if target.contains("dragonfly") {
-            cfg.define("CMAKE_SYSTEM_NAME", "DragonFly");
-        } else if target.contains("freebsd") {
-            cfg.define("CMAKE_SYSTEM_NAME", "FreeBSD");
-        } else if target.contains("windows") {
-            cfg.define("CMAKE_SYSTEM_NAME", "Windows");
-        } else if target.contains("haiku") {
-            cfg.define("CMAKE_SYSTEM_NAME", "Haiku");
-        } else if target.contains("solaris") || target.contains("illumos") {
-            cfg.define("CMAKE_SYSTEM_NAME", "SunOS");
-        } else if target.contains("linux") {
-            cfg.define("CMAKE_SYSTEM_NAME", "Linux");
-        } else {
-            builder.info(&format!(
-                "could not determine CMAKE_SYSTEM_NAME from the target `{target}`, build may fail",
-            ));
-        }
-
-        // When cross-compiling we should also set CMAKE_SYSTEM_VERSION, but in
-        // that case like CMake we cannot easily determine system version either.
-        //
-        // Since, the LLVM itself makes rather limited use of version checks in
-        // CMakeFiles (and then only in tests), and so far no issues have been
-        // reported, the system version is currently left unset.
-
-        if target.contains("darwin") {
-            // Make sure that CMake does not build universal binaries on macOS.
-            // Explicitly specify the one single target architecture.
-            if target.starts_with("aarch64") {
-                // macOS uses a different name for building arm64
-                cfg.define("CMAKE_OSX_ARCHITECTURES", "arm64");
-            } else if target.starts_with("i686") {
-                // macOS uses a different name for building i386
-                cfg.define("CMAKE_OSX_ARCHITECTURES", "i386");
-            } else {
-                cfg.define("CMAKE_OSX_ARCHITECTURES", target.triple.split('-').next().unwrap());
-            }
-        }
-    }
-
-    let sanitize_cc = |cc: &Path| {
-        if target.contains("msvc") {
-            OsString::from(cc.to_str().unwrap().replace("\\", "/"))
-        } else {
-            cc.as_os_str().to_owned()
-        }
-    };
-
-    // MSVC with CMake uses msbuild by default which doesn't respect these
-    // vars that we'd otherwise configure. In that case we just skip this
-    // entirely.
-    if target.contains("msvc") && !builder.ninja() {
-        return;
-    }
-
-    let (cc, cxx) = match builder.config.llvm_clang_cl {
-        Some(ref cl) => (cl.into(), cl.into()),
-        None => (builder.cc(target), builder.cxx(target).unwrap()),
-    };
-
-    // Handle msvc + ninja + ccache specially (this is what the bots use)
-    if target.contains("msvc") && builder.ninja() && builder.config.ccache.is_some() {
-        let mut wrap_cc = env::current_exe().expect("failed to get cwd");
-        wrap_cc.set_file_name("sccache-plus-cl.exe");
-
-        cfg.define("CMAKE_C_COMPILER", sanitize_cc(&wrap_cc))
-            .define("CMAKE_CXX_COMPILER", sanitize_cc(&wrap_cc));
-        cfg.env("SCCACHE_PATH", builder.config.ccache.as_ref().unwrap())
-            .env("SCCACHE_TARGET", target.triple)
-            .env("SCCACHE_CC", &cc)
-            .env("SCCACHE_CXX", &cxx);
-
-        // Building LLVM on MSVC can be a little ludicrous at times. We're so far
-        // off the beaten path here that I'm not really sure this is even half
-        // supported any more. Here we're trying to:
-        //
-        // * Build LLVM on MSVC
-        // * Build LLVM with `clang-cl` instead of `cl.exe`
-        // * Build a project with `sccache`
-        // * Build for 32-bit as well
-        // * Build with Ninja
-        //
-        // For `cl.exe` there are different binaries to compile 32/64 bit which
-        // we use but for `clang-cl` there's only one which internally
-        // multiplexes via flags. As a result it appears that CMake's detection
-        // of a compiler's architecture and such on MSVC **doesn't** pass any
-        // custom flags we pass in CMAKE_CXX_FLAGS below. This means that if we
-        // use `clang-cl.exe` it's always diagnosed as a 64-bit compiler which
-        // definitely causes problems since all the env vars are pointing to
-        // 32-bit libraries.
-        //
-        // To hack around this... again... we pass an argument that's
-        // unconditionally passed in the sccache shim. This'll get CMake to
-        // correctly diagnose it's doing a 32-bit compilation and LLVM will
-        // internally configure itself appropriately.
-        if builder.config.llvm_clang_cl.is_some() && target.contains("i686") {
-            cfg.env("SCCACHE_EXTRA_ARGS", "-m32");
-        }
-    } else {
-        // If ccache is configured we inform the build a little differently how
-        // to invoke ccache while also invoking our compilers.
-        if use_compiler_launcher {
-            if let Some(ref ccache) = builder.config.ccache {
-                cfg.define("CMAKE_C_COMPILER_LAUNCHER", ccache)
-                    .define("CMAKE_CXX_COMPILER_LAUNCHER", ccache);
-            }
-        }
-        cfg.define("CMAKE_C_COMPILER", sanitize_cc(&cc))
-            .define("CMAKE_CXX_COMPILER", sanitize_cc(&cxx))
-            .define("CMAKE_ASM_COMPILER", sanitize_cc(&cc));
-    }
-
-    cfg.build_arg("-j").build_arg(builder.jobs().to_string());
-    let mut cflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::C).join(" ").into();
-    if let Some(ref s) = builder.config.llvm_cflags {
-        cflags.push(" ");
-        cflags.push(s);
-    }
-
-    if builder.config.llvm_clang_cl.is_some() {
-        cflags.push(&format!(" --target={target}"));
-    }
-    for flag in extra_compiler_flags {
-        cflags.push(&format!(" {flag}"));
-    }
-    cfg.define("CMAKE_C_FLAGS", cflags);
-    let mut cxxflags: OsString = builder.cflags(target, GitRepo::Llvm, CLang::Cxx).join(" ").into();
-    if let Some(ref s) = builder.config.llvm_cxxflags {
-        cxxflags.push(" ");
-        cxxflags.push(s);
-    }
-    if builder.config.llvm_clang_cl.is_some() {
-        cxxflags.push(&format!(" --target={target}"));
-    }
-    for flag in extra_compiler_flags {
-        cxxflags.push(&format!(" {flag}"));
-    }
-    cfg.define("CMAKE_CXX_FLAGS", cxxflags);
-    if let Some(ar) = builder.ar(target) {
-        if ar.is_absolute() {
-            // LLVM build breaks if `CMAKE_AR` is a relative path, for some reason it
-            // tries to resolve this path in the LLVM build directory.
-            cfg.define("CMAKE_AR", sanitize_cc(&ar));
-        }
-    }
-
-    if let Some(ranlib) = builder.ranlib(target) {
-        if ranlib.is_absolute() {
-            // LLVM build breaks if `CMAKE_RANLIB` is a relative path, for some reason it
-            // tries to resolve this path in the LLVM build directory.
-            cfg.define("CMAKE_RANLIB", sanitize_cc(&ranlib));
-        }
-    }
-
-    if let Some(ref flags) = builder.config.llvm_ldflags {
-        ldflags.push_all(flags);
-    }
-
-    if let Some(flags) = get_var("LDFLAGS", &builder.config.build.triple, &target.triple) {
-        ldflags.push_all(&flags);
-    }
-
-    // For distribution we want the LLVM tools to be *statically* linked to libstdc++.
-    // We also do this if the user explicitly requested static libstdc++.
-    if builder.config.llvm_static_stdcpp
-        && !target.contains("msvc")
-        && !target.contains("netbsd")
-        && !target.contains("solaris")
-    {
-        if target.contains("apple") || target.contains("windows") {
-            ldflags.push_all("-static-libstdc++");
-        } else {
-            ldflags.push_all("-Wl,-Bsymbolic -static-libstdc++");
-        }
-    }
-
-    cfg.define("CMAKE_SHARED_LINKER_FLAGS", &ldflags.shared);
-    cfg.define("CMAKE_MODULE_LINKER_FLAGS", &ldflags.module);
-    cfg.define("CMAKE_EXE_LINKER_FLAGS", &ldflags.exe);
-
-    if env::var_os("SCCACHE_ERROR_LOG").is_some() {
-        cfg.env("RUSTC_LOG", "sccache=warn");
-    }
-}
-
-fn configure_llvm(builder: &Builder<'_>, target: TargetSelection, cfg: &mut cmake::Config) {
-    // ThinLTO is only available when building with LLVM, enabling LLD is required.
-    // Apple's linker ld64 supports ThinLTO out of the box though, so don't use LLD on Darwin.
-    if builder.config.llvm_thin_lto {
-        cfg.define("LLVM_ENABLE_LTO", "Thin");
-        if !target.contains("apple") {
-            cfg.define("LLVM_ENABLE_LLD", "ON");
-        }
-    }
-
-    if let Some(ref linker) = builder.config.llvm_use_linker {
-        cfg.define("LLVM_USE_LINKER", linker);
-    }
-
-    if builder.config.llvm_allow_old_toolchain {
-        cfg.define("LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN", "YES");
-    }
-}
-
-// Adapted from https://github.com/alexcrichton/cc-rs/blob/fba7feded71ee4f63cfe885673ead6d7b4f2f454/src/lib.rs#L2347-L2365
-fn get_var(var_base: &str, host: &str, target: &str) -> Option<OsString> {
-    let kind = if host == target { "HOST" } else { "TARGET" };
-    let target_u = target.replace("-", "_");
-    env::var_os(&format!("{var_base}_{target}"))
-        .or_else(|| env::var_os(&format!("{}_{}", var_base, target_u)))
-        .or_else(|| env::var_os(&format!("{}_{}", kind, var_base)))
-        .or_else(|| env::var_os(var_base))
-}
-
-#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
-pub struct Lld {
-    pub target: TargetSelection,
-}
-
-impl Step for Lld {
-    type Output = PathBuf;
-    const ONLY_HOSTS: bool = true;
-
-    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.path("src/llvm-project/lld")
-    }
-
-    fn make_run(run: RunConfig<'_>) {
-        run.builder.ensure(Lld { target: run.target });
-    }
-
-    /// Compile LLD for `target`.
-    fn run(self, builder: &Builder<'_>) -> PathBuf {
-        if builder.config.dry_run() {
-            return PathBuf::from("lld-out-dir-test-gen");
-        }
-        let target = self.target;
-
-        let LlvmResult { llvm_config, llvm_cmake_dir } = builder.ensure(Llvm { target });
-
-        // The `dist` step packages LLD next to LLVM's binaries for download-ci-llvm. The root path
-        // we usually expect here is `./build/$triple/ci-llvm/`, with the binaries in its `bin`
-        // subfolder. We check if that's the case, and if LLD's binary already exists there next to
-        // `llvm-config`: if so, we can use it instead of building LLVM/LLD from source.
-        let ci_llvm_bin = llvm_config.parent().unwrap();
-        if ci_llvm_bin.is_dir() && ci_llvm_bin.file_name().unwrap() == "bin" {
-            let lld_path = ci_llvm_bin.join(exe("lld", target));
-            if lld_path.exists() {
-                // The following steps copying `lld` as `rust-lld` to the sysroot, expect it in the
-                // `bin` subfolder of this step's out dir.
-                return ci_llvm_bin.parent().unwrap().to_path_buf();
-            }
-        }
-
-        let out_dir = builder.lld_out(target);
-        let done_stamp = out_dir.join("lld-finished-building");
-        if done_stamp.exists() {
-            return out_dir;
-        }
-
-        let _guard = builder.msg_unstaged(Kind::Build, "LLD", target);
-        let _time = util::timeit(&builder);
-        t!(fs::create_dir_all(&out_dir));
-
-        let mut cfg = cmake::Config::new(builder.src.join("src/llvm-project/lld"));
-        let mut ldflags = LdFlags::default();
-
-        // When building LLD as part of a build with instrumentation on windows, for example
-        // when doing PGO on CI, cmake or clang-cl don't automatically link clang's
-        // profiler runtime in. In that case, we need to manually ask cmake to do it, to avoid
-        // linking errors, much like LLVM's cmake setup does in that situation.
-        if builder.config.llvm_profile_generate && target.contains("msvc") {
-            if let Some(clang_cl_path) = builder.config.llvm_clang_cl.as_ref() {
-                // Find clang's runtime library directory and push that as a search path to the
-                // cmake linker flags.
-                let clang_rt_dir = get_clang_cl_resource_dir(clang_cl_path);
-                ldflags.push_all(&format!("/libpath:{}", clang_rt_dir.display()));
-            }
-        }
-
-        // LLD is built as an LLVM tool, but is distributed outside of the `llvm-tools` component,
-        // which impacts where it expects to find LLVM's shared library. This causes #80703.
-        //
-        // LLD is distributed at "$root/lib/rustlib/$host/bin/rust-lld", but the `libLLVM-*.so` it
-        // needs is distributed at "$root/lib". The default rpath of "$ORIGIN/../lib" points at the
-        // lib path for LLVM tools, not the one for rust binaries.
-        //
-        // (The `llvm-tools` component copies the .so there for the other tools, and with that
-        // component installed, one can successfully invoke `rust-lld` directly without rustup's
-        // `LD_LIBRARY_PATH` overrides)
-        //
-        if builder.config.rpath_enabled(target)
-            && util::use_host_linker(target)
-            && builder.config.llvm_link_shared()
-            && target.contains("linux")
-        {
-            // So we inform LLD where it can find LLVM's libraries by adding an rpath entry to the
-            // expected parent `lib` directory.
-            //
-            // Be careful when changing this path, we need to ensure it's quoted or escaped:
-            // `$ORIGIN` would otherwise be expanded when the `LdFlags` are passed verbatim to
-            // cmake.
-            ldflags.push_all("-Wl,-rpath,'$ORIGIN/../../../'");
-        }
-
-        configure_cmake(builder, target, &mut cfg, true, ldflags, &[]);
-        configure_llvm(builder, target, &mut cfg);
-
-        // Re-use the same flags as llvm to control the level of debug information
-        // generated for lld.
-        let profile = match (builder.config.llvm_optimize, builder.config.llvm_release_debuginfo) {
-            (false, _) => "Debug",
-            (true, false) => "Release",
-            (true, true) => "RelWithDebInfo",
-        };
-
-        cfg.out_dir(&out_dir)
-            .profile(profile)
-            .define("LLVM_CMAKE_DIR", llvm_cmake_dir)
-            .define("LLVM_INCLUDE_TESTS", "OFF");
-
-        if target != builder.config.build {
-            // Use the host llvm-tblgen binary.
-            cfg.define(
-                "LLVM_TABLEGEN_EXE",
-                llvm_config.with_file_name("llvm-tblgen").with_extension(EXE_EXTENSION),
-            );
-        }
-
-        cfg.build();
-
-        t!(File::create(&done_stamp));
-        out_dir
-    }
-}
-
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub struct Sanitizers {
-    pub target: TargetSelection,
-}
-
-impl Step for Sanitizers {
-    type Output = Vec<SanitizerRuntime>;
-
-    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.alias("sanitizers")
-    }
-
-    fn make_run(run: RunConfig<'_>) {
-        run.builder.ensure(Sanitizers { target: run.target });
-    }
-
-    /// Builds sanitizer runtime libraries.
-    fn run(self, builder: &Builder<'_>) -> Self::Output {
-        let compiler_rt_dir = builder.src.join("src/llvm-project/compiler-rt");
-        if !compiler_rt_dir.exists() {
-            return Vec::new();
-        }
-
-        let out_dir = builder.native_dir(self.target).join("sanitizers");
-        let runtimes = supported_sanitizers(&out_dir, self.target, &builder.config.channel);
-        if runtimes.is_empty() {
-            return runtimes;
-        }
-
-        let LlvmResult { llvm_config, .. } = builder.ensure(Llvm { target: builder.config.build });
-        if builder.config.dry_run() {
-            return runtimes;
-        }
-
-        let stamp = out_dir.join("sanitizers-finished-building");
-        let stamp = HashStamp::new(stamp, builder.in_tree_llvm_info.sha());
-
-        if stamp.is_done() {
-            if stamp.hash.is_none() {
-                builder.info(&format!(
-                    "Rebuild sanitizers by removing the file `{}`",
-                    stamp.path.display()
-                ));
-            }
-            return runtimes;
-        }
-
-        let _guard = builder.msg_unstaged(Kind::Build, "sanitizers", self.target);
-        t!(stamp.remove());
-        let _time = util::timeit(&builder);
-
-        let mut cfg = cmake::Config::new(&compiler_rt_dir);
-        cfg.profile("Release");
-        cfg.define("CMAKE_C_COMPILER_TARGET", self.target.triple);
-        cfg.define("COMPILER_RT_BUILD_BUILTINS", "OFF");
-        cfg.define("COMPILER_RT_BUILD_CRT", "OFF");
-        cfg.define("COMPILER_RT_BUILD_LIBFUZZER", "OFF");
-        cfg.define("COMPILER_RT_BUILD_PROFILE", "OFF");
-        cfg.define("COMPILER_RT_BUILD_SANITIZERS", "ON");
-        cfg.define("COMPILER_RT_BUILD_XRAY", "OFF");
-        cfg.define("COMPILER_RT_DEFAULT_TARGET_ONLY", "ON");
-        cfg.define("COMPILER_RT_USE_LIBCXX", "OFF");
-        cfg.define("LLVM_CONFIG_PATH", &llvm_config);
-
-        // On Darwin targets the sanitizer runtimes are build as universal binaries.
-        // Unfortunately sccache currently lacks support to build them successfully.
-        // Disable compiler launcher on Darwin targets to avoid potential issues.
-        let use_compiler_launcher = !self.target.contains("apple-darwin");
-        let extra_compiler_flags: &[&str] =
-            if self.target.contains("apple") { &["-fembed-bitcode=off"] } else { &[] };
-        configure_cmake(
-            builder,
-            self.target,
-            &mut cfg,
-            use_compiler_launcher,
-            LdFlags::default(),
-            extra_compiler_flags,
-        );
-
-        t!(fs::create_dir_all(&out_dir));
-        cfg.out_dir(out_dir);
-
-        for runtime in &runtimes {
-            cfg.build_target(&runtime.cmake_target);
-            cfg.build();
-        }
-        t!(stamp.write());
-
-        runtimes
-    }
-}
-
-#[derive(Clone, Debug)]
-pub struct SanitizerRuntime {
-    /// CMake target used to build the runtime.
-    pub cmake_target: String,
-    /// Path to the built runtime library.
-    pub path: PathBuf,
-    /// Library filename that will be used rustc.
-    pub name: String,
-}
-
-/// Returns sanitizers available on a given target.
-fn supported_sanitizers(
-    out_dir: &Path,
-    target: TargetSelection,
-    channel: &str,
-) -> Vec<SanitizerRuntime> {
-    let darwin_libs = |os: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
-        components
-            .iter()
-            .map(move |c| SanitizerRuntime {
-                cmake_target: format!("clang_rt.{}_{}_dynamic", c, os),
-                path: out_dir
-                    .join(&format!("build/lib/darwin/libclang_rt.{}_{}_dynamic.dylib", c, os)),
-                name: format!("librustc-{}_rt.{}.dylib", channel, c),
-            })
-            .collect()
-    };
-
-    let common_libs = |os: &str, arch: &str, components: &[&str]| -> Vec<SanitizerRuntime> {
-        components
-            .iter()
-            .map(move |c| SanitizerRuntime {
-                cmake_target: format!("clang_rt.{}-{}", c, arch),
-                path: out_dir.join(&format!("build/lib/{}/libclang_rt.{}-{}.a", os, c, arch)),
-                name: format!("librustc-{}_rt.{}.a", channel, c),
-            })
-            .collect()
-    };
-
-    match &*target.triple {
-        "aarch64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
-        "aarch64-apple-ios" => darwin_libs("ios", &["asan", "tsan"]),
-        "aarch64-apple-ios-sim" => darwin_libs("iossim", &["asan", "tsan"]),
-        "aarch64-apple-ios-macabi" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
-        "aarch64-unknown-fuchsia" => common_libs("fuchsia", "aarch64", &["asan"]),
-        "aarch64-unknown-linux-gnu" => {
-            common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan", "hwasan"])
-        }
-        "aarch64-unknown-linux-ohos" => {
-            common_libs("linux", "aarch64", &["asan", "lsan", "msan", "tsan", "hwasan"])
-        }
-        "x86_64-apple-darwin" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
-        "x86_64-unknown-fuchsia" => common_libs("fuchsia", "x86_64", &["asan"]),
-        "x86_64-apple-ios" => darwin_libs("iossim", &["asan", "tsan"]),
-        "x86_64-apple-ios-macabi" => darwin_libs("osx", &["asan", "lsan", "tsan"]),
-        "x86_64-unknown-freebsd" => common_libs("freebsd", "x86_64", &["asan", "msan", "tsan"]),
-        "x86_64-unknown-netbsd" => {
-            common_libs("netbsd", "x86_64", &["asan", "lsan", "msan", "tsan"])
-        }
-        "x86_64-unknown-illumos" => common_libs("illumos", "x86_64", &["asan"]),
-        "x86_64-pc-solaris" => common_libs("solaris", "x86_64", &["asan"]),
-        "x86_64-unknown-linux-gnu" => {
-            common_libs("linux", "x86_64", &["asan", "lsan", "msan", "safestack", "tsan"])
-        }
-        "x86_64-unknown-linux-musl" => {
-            common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
-        }
-        "s390x-unknown-linux-gnu" => {
-            common_libs("linux", "s390x", &["asan", "lsan", "msan", "tsan"])
-        }
-        "s390x-unknown-linux-musl" => {
-            common_libs("linux", "s390x", &["asan", "lsan", "msan", "tsan"])
-        }
-        "x86_64-unknown-linux-ohos" => {
-            common_libs("linux", "x86_64", &["asan", "lsan", "msan", "tsan"])
-        }
-        _ => Vec::new(),
-    }
-}
-
-struct HashStamp {
-    path: PathBuf,
-    hash: Option<Vec<u8>>,
-}
-
-impl HashStamp {
-    fn new(path: PathBuf, hash: Option<&str>) -> Self {
-        HashStamp { path, hash: hash.map(|s| s.as_bytes().to_owned()) }
-    }
-
-    fn is_done(&self) -> bool {
-        match fs::read(&self.path) {
-            Ok(h) => self.hash.as_deref().unwrap_or(b"") == h.as_slice(),
-            Err(e) if e.kind() == io::ErrorKind::NotFound => false,
-            Err(e) => {
-                panic!("failed to read stamp file `{}`: {}", self.path.display(), e);
-            }
-        }
-    }
-
-    fn remove(&self) -> io::Result<()> {
-        match fs::remove_file(&self.path) {
-            Ok(()) => Ok(()),
-            Err(e) => {
-                if e.kind() == io::ErrorKind::NotFound {
-                    Ok(())
-                } else {
-                    Err(e)
-                }
-            }
-        }
-    }
-
-    fn write(&self) -> io::Result<()> {
-        fs::write(&self.path, self.hash.as_deref().unwrap_or(b""))
-    }
-}
-
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub struct CrtBeginEnd {
-    pub target: TargetSelection,
-}
-
-impl Step for CrtBeginEnd {
-    type Output = PathBuf;
-
-    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.path("src/llvm-project/compiler-rt/lib/crt")
-    }
-
-    fn make_run(run: RunConfig<'_>) {
-        run.builder.ensure(CrtBeginEnd { target: run.target });
-    }
-
-    /// Build crtbegin.o/crtend.o for musl target.
-    fn run(self, builder: &Builder<'_>) -> Self::Output {
-        builder.update_submodule(&Path::new("src/llvm-project"));
-
-        let out_dir = builder.native_dir(self.target).join("crt");
-
-        if builder.config.dry_run() {
-            return out_dir;
-        }
-
-        let crtbegin_src = builder.src.join("src/llvm-project/compiler-rt/lib/builtins/crtbegin.c");
-        let crtend_src = builder.src.join("src/llvm-project/compiler-rt/lib/builtins/crtend.c");
-        if up_to_date(&crtbegin_src, &out_dir.join("crtbegin.o"))
-            && up_to_date(&crtend_src, &out_dir.join("crtendS.o"))
-        {
-            return out_dir;
-        }
-
-        let _guard = builder.msg_unstaged(Kind::Build, "crtbegin.o and crtend.o", self.target);
-        t!(fs::create_dir_all(&out_dir));
-
-        let mut cfg = cc::Build::new();
-
-        if let Some(ar) = builder.ar(self.target) {
-            cfg.archiver(ar);
-        }
-        cfg.compiler(builder.cc(self.target));
-        cfg.cargo_metadata(false)
-            .out_dir(&out_dir)
-            .target(&self.target.triple)
-            .host(&builder.config.build.triple)
-            .warnings(false)
-            .debug(false)
-            .opt_level(3)
-            .file(crtbegin_src)
-            .file(crtend_src);
-
-        // Those flags are defined in src/llvm-project/compiler-rt/lib/crt/CMakeLists.txt
-        // Currently only consumer of those objects is musl, which use .init_array/.fini_array
-        // instead of .ctors/.dtors
-        cfg.flag("-std=c11")
-            .define("CRT_HAS_INITFINI_ARRAY", None)
-            .define("EH_USE_FRAME_REGISTRY", None);
-
-        cfg.compile("crt");
-
-        t!(fs::copy(out_dir.join("crtbegin.o"), out_dir.join("crtbeginS.o")));
-        t!(fs::copy(out_dir.join("crtend.o"), out_dir.join("crtendS.o")));
-        out_dir
-    }
-}
-
-#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
-pub struct Libunwind {
-    pub target: TargetSelection,
-}
-
-impl Step for Libunwind {
-    type Output = PathBuf;
-
-    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.path("src/llvm-project/libunwind")
-    }
-
-    fn make_run(run: RunConfig<'_>) {
-        run.builder.ensure(Libunwind { target: run.target });
-    }
-
-    /// Build libunwind.a
-    fn run(self, builder: &Builder<'_>) -> Self::Output {
-        builder.update_submodule(&Path::new("src/llvm-project"));
-
-        if builder.config.dry_run() {
-            return PathBuf::new();
-        }
-
-        let out_dir = builder.native_dir(self.target).join("libunwind");
-        let root = builder.src.join("src/llvm-project/libunwind");
-
-        if up_to_date(&root, &out_dir.join("libunwind.a")) {
-            return out_dir;
-        }
-
-        let _guard = builder.msg_unstaged(Kind::Build, "libunwind.a", self.target);
-        t!(fs::create_dir_all(&out_dir));
-
-        let mut cc_cfg = cc::Build::new();
-        let mut cpp_cfg = cc::Build::new();
-
-        cpp_cfg.cpp(true);
-        cpp_cfg.cpp_set_stdlib(None);
-        cpp_cfg.flag("-nostdinc++");
-        cpp_cfg.flag("-fno-exceptions");
-        cpp_cfg.flag("-fno-rtti");
-        cpp_cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");
-
-        for cfg in [&mut cc_cfg, &mut cpp_cfg].iter_mut() {
-            if let Some(ar) = builder.ar(self.target) {
-                cfg.archiver(ar);
-            }
-            cfg.target(&self.target.triple);
-            cfg.host(&builder.config.build.triple);
-            cfg.warnings(false);
-            cfg.debug(false);
-            // get_compiler() need set opt_level first.
-            cfg.opt_level(3);
-            cfg.flag("-fstrict-aliasing");
-            cfg.flag("-funwind-tables");
-            cfg.flag("-fvisibility=hidden");
-            cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
-            cfg.include(root.join("include"));
-            cfg.cargo_metadata(false);
-            cfg.out_dir(&out_dir);
-
-            if self.target.contains("x86_64-fortanix-unknown-sgx") {
-                cfg.static_flag(true);
-                cfg.flag("-fno-stack-protector");
-                cfg.flag("-ffreestanding");
-                cfg.flag("-fexceptions");
-
-                // easiest way to undefine since no API available in cc::Build to undefine
-                cfg.flag("-U_FORTIFY_SOURCE");
-                cfg.define("_FORTIFY_SOURCE", "0");
-                cfg.define("RUST_SGX", "1");
-                cfg.define("__NO_STRING_INLINES", None);
-                cfg.define("__NO_MATH_INLINES", None);
-                cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
-                cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
-                cfg.define("NDEBUG", None);
-            }
-            if self.target.contains("windows") {
-                cfg.define("_LIBUNWIND_HIDE_SYMBOLS", "1");
-                cfg.define("_LIBUNWIND_IS_NATIVE_ONLY", "1");
-            }
-        }
-
-        cc_cfg.compiler(builder.cc(self.target));
-        if let Ok(cxx) = builder.cxx(self.target) {
-            cpp_cfg.compiler(cxx);
-        } else {
-            cc_cfg.compiler(builder.cc(self.target));
-        }
-
-        // Don't set this for clang
-        // By default, Clang builds C code in GNU C17 mode.
-        // By default, Clang builds C++ code according to the C++98 standard,
-        // with many C++11 features accepted as extensions.
-        if cc_cfg.get_compiler().is_like_gnu() {
-            cc_cfg.flag("-std=c99");
-        }
-        if cpp_cfg.get_compiler().is_like_gnu() {
-            cpp_cfg.flag("-std=c++11");
-        }
-
-        if self.target.contains("x86_64-fortanix-unknown-sgx") || self.target.contains("musl") {
-            // use the same GCC C compiler command to compile C++ code so we do not need to setup the
-            // C++ compiler env variables on the builders.
-            // Don't set this for clang++, as clang++ is able to compile this without libc++.
-            if cpp_cfg.get_compiler().is_like_gnu() {
-                cpp_cfg.cpp(false);
-                cpp_cfg.compiler(builder.cc(self.target));
-            }
-        }
-
-        let mut c_sources = vec![
-            "Unwind-sjlj.c",
-            "UnwindLevel1-gcc-ext.c",
-            "UnwindLevel1.c",
-            "UnwindRegistersRestore.S",
-            "UnwindRegistersSave.S",
-        ];
-
-        let cpp_sources = vec!["Unwind-EHABI.cpp", "Unwind-seh.cpp", "libunwind.cpp"];
-        let cpp_len = cpp_sources.len();
-
-        if self.target.contains("x86_64-fortanix-unknown-sgx") {
-            c_sources.push("UnwindRustSgx.c");
-        }
-
-        for src in c_sources {
-            cc_cfg.file(root.join("src").join(src).canonicalize().unwrap());
-        }
-
-        for src in &cpp_sources {
-            cpp_cfg.file(root.join("src").join(src).canonicalize().unwrap());
-        }
-
-        cpp_cfg.compile("unwind-cpp");
-
-        // FIXME: https://github.com/alexcrichton/cc-rs/issues/545#issuecomment-679242845
-        let mut count = 0;
-        for entry in fs::read_dir(&out_dir).unwrap() {
-            let file = entry.unwrap().path().canonicalize().unwrap();
-            if file.is_file() && file.extension() == Some(OsStr::new("o")) {
-                // file name starts with "Unwind-EHABI", "Unwind-seh" or "libunwind"
-                let file_name = file.file_name().unwrap().to_str().expect("UTF-8 file name");
-                if cpp_sources.iter().any(|f| file_name.starts_with(&f[..f.len() - 4])) {
-                    cc_cfg.object(&file);
-                    count += 1;
-                }
-            }
-        }
-        assert_eq!(cpp_len, count, "Can't get object files from {:?}", &out_dir);
-
-        cc_cfg.compile("unwind");
-        out_dir
-    }
-}