Auto merge of #3217 - RalfJung:rustup, r=RalfJung

Rustup

Pulls in https://github.com/rust-lang/rust/pull/117953 (in preparation for implementing those intrinsics)

36 files changed, 440 insertions, 143 deletions

diff --git a/src/bootstrap/src/bin/main.rs b/src/bootstrap/src/bin/main.rs
index 952ef40ed42..b3c427721ea 100644
--- a/src/bootstrap/src/bin/main.rs
+++ b/src/bootstrap/src/bin/main.rs
@@ -26,35 +26,40 @@ fn main() {
     let mut build_lock;
     #[cfg(all(any(unix, windows), not(target_os = "solaris")))]
     let _build_lock_guard;
-    #[cfg(all(any(unix, windows), not(target_os = "solaris")))]
-    // Display PID of process holding the lock
-    // PID will be stored in a lock file
-    {
-        let path = config.out.join("lock");
-        let pid = match fs::read_to_string(&path) {
-            Ok(contents) => contents,
-            Err(_) => String::new(),
-        };
-
-        build_lock =
-            fd_lock::RwLock::new(t!(fs::OpenOptions::new().write(true).create(true).open(&path)));
-        _build_lock_guard = match build_lock.try_write() {
-            Ok(mut lock) => {
-                t!(lock.write(&process::id().to_string().as_ref()));
-                lock
-            }
-            err => {
-                drop(err);
-                println!("WARNING: build directory locked by process {pid}, waiting for lock");
-                let mut lock = t!(build_lock.write());
-                t!(lock.write(&process::id().to_string().as_ref()));
-                lock
-            }
-        };
-    }
 
-    #[cfg(any(not(any(unix, windows)), target_os = "solaris"))]
-    println!("WARNING: file locking not supported for target, not locking build directory");
+    if !config.bypass_bootstrap_lock {
+        // Display PID of process holding the lock
+        // PID will be stored in a lock file
+        #[cfg(all(any(unix, windows), not(target_os = "solaris")))]
+        {
+            let path = config.out.join("lock");
+            let pid = match fs::read_to_string(&path) {
+                Ok(contents) => contents,
+                Err(_) => String::new(),
+            };
+
+            build_lock = fd_lock::RwLock::new(t!(fs::OpenOptions::new()
+                .write(true)
+                .create(true)
+                .open(&path)));
+            _build_lock_guard = match build_lock.try_write() {
+                Ok(mut lock) => {
+                    t!(lock.write(&process::id().to_string().as_ref()));
+                    lock
+                }
+                err => {
+                    drop(err);
+                    println!("WARNING: build directory locked by process {pid}, waiting for lock");
+                    let mut lock = t!(build_lock.write());
+                    t!(lock.write(&process::id().to_string().as_ref()));
+                    lock
+                }
+            };
+        }
+
+        #[cfg(any(not(any(unix, windows)), target_os = "solaris"))]
+        println!("WARNING: file locking not supported for target, not locking build directory");
+    }
 
     // check_version warnings are not printed during setup
     let changelog_suggestion =
diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index c253dd2c6aa..1ab488ef656 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -1722,7 +1722,7 @@ impl Step for Assemble {
             let dst_exe = exe("rust-lld", target_compiler.host);
             builder.copy(&lld_install.join("bin").join(&src_exe), &libdir_bin.join(&dst_exe));
             let self_contained_lld_dir = libdir_bin.join("gcc-ld");
-            t!(fs::create_dir(&self_contained_lld_dir));
+            t!(fs::create_dir_all(&self_contained_lld_dir));
             let lld_wrapper_exe = builder.ensure(crate::core::build_steps::tool::LldWrapper {
                 compiler: build_compiler,
                 target: target_compiler.host,
diff --git a/src/bootstrap/src/core/build_steps/doc.rs b/src/bootstrap/src/core/build_steps/doc.rs
index 834f88dc891..cf3f5bc983e 100644
--- a/src/bootstrap/src/core/build_steps/doc.rs
+++ b/src/bootstrap/src/core/build_steps/doc.rs
@@ -996,15 +996,14 @@ tool_doc!(
     in_tree = false,
     crates = [
         "cargo",
+        "cargo-credential",
         "cargo-platform",
-        "cargo-util",
-        "crates-io",
         "cargo-test-macro",
         "cargo-test-support",
-        "cargo-credential",
+        "cargo-util",
+        "crates-io",
         "mdman",
-        // FIXME: this trips a license check in tidy.
-        // "resolver-tests",
+        "rustfix",
     ]
 );
 tool_doc!(Tidy, "tidy", "src/tools/tidy", rustc_tool = false, crates = ["tidy"]);
diff --git a/src/bootstrap/src/core/builder.rs b/src/bootstrap/src/core/builder.rs
index 80dc5439b3b..d018be5f8e1 100644
--- a/src/bootstrap/src/core/builder.rs
+++ b/src/bootstrap/src/core/builder.rs
@@ -1667,6 +1667,12 @@ impl<'a> Builder<'a> {
             }
         }
 
+        cargo.env(profile_var("STRIP"), self.config.rust_strip.to_string());
+
+        if let Some(stack_protector) = &self.config.rust_stack_protector {
+            rustflags.arg(&format!("-Zstack-protector={stack_protector}"));
+        }
+
         if let Some(host_linker) = self.linker(compiler.host) {
             hostflags.arg(format!("-Clinker={}", host_linker.display()));
         }
diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs
index 22e8ce8365b..b5291817e79 100644
--- a/src/bootstrap/src/core/config/config.rs
+++ b/src/bootstrap/src/core/config/config.rs
@@ -117,6 +117,7 @@ impl Display for DebuginfoLevel {
 pub struct Config {
     pub changelog_seen: Option<usize>, // FIXME: Deprecated field. Remove it at 2024.
     pub change_id: Option<usize>,
+    pub bypass_bootstrap_lock: bool,
     pub ccache: Option<String>,
     /// Call Build::ninja() instead of this.
     pub ninja_in_file: bool,
@@ -222,6 +223,8 @@ pub struct Config {
     pub rust_debuginfo_level_tests: DebuginfoLevel,
     pub rust_split_debuginfo: SplitDebuginfo,
     pub rust_rpath: bool,
+    pub rust_strip: bool,
+    pub rust_stack_protector: Option<String>,
     pub rustc_parallel: bool,
     pub rustc_default_linker: Option<String>,
     pub rust_optimize_tests: bool,
@@ -1001,6 +1004,8 @@ define_config! {
         description: Option<String> = "description",
         musl_root: Option<String> = "musl-root",
         rpath: Option<bool> = "rpath",
+        strip: Option<bool> = "strip",
+        stack_protector: Option<String> = "stack-protector",
         verbose_tests: Option<bool> = "verbose-tests",
         optimize_tests: Option<bool> = "optimize-tests",
         codegen_tests: Option<bool> = "codegen-tests",
@@ -1059,6 +1064,7 @@ define_config! {
 impl Config {
     pub fn default_opts() -> Config {
         let mut config = Config::default();
+        config.bypass_bootstrap_lock = false;
         config.llvm_optimize = true;
         config.ninja_in_file = true;
         config.llvm_static_stdcpp = false;
@@ -1069,6 +1075,7 @@ impl Config {
         config.docs = true;
         config.docs_minification = true;
         config.rust_rpath = true;
+        config.rust_strip = false;
         config.channel = "dev".to_string();
         config.codegen_tests = true;
         config.rust_dist_src = true;
@@ -1137,6 +1144,7 @@ impl Config {
         config.llvm_profile_use = flags.llvm_profile_use;
         config.llvm_profile_generate = flags.llvm_profile_generate;
         config.enable_bolt_settings = flags.enable_bolt_settings;
+        config.bypass_bootstrap_lock = flags.bypass_bootstrap_lock;
 
         // Infer the rest of the configuration.
 
@@ -1422,6 +1430,8 @@ impl Config {
             set(&mut config.rust_optimize_tests, rust.optimize_tests);
             set(&mut config.codegen_tests, rust.codegen_tests);
             set(&mut config.rust_rpath, rust.rpath);
+            set(&mut config.rust_strip, rust.strip);
+            config.rust_stack_protector = rust.stack_protector;
             set(&mut config.jemalloc, rust.jemalloc);
             set(&mut config.test_compare_mode, rust.test_compare_mode);
             set(&mut config.backtrace, rust.backtrace);
diff --git a/src/bootstrap/src/core/config/flags.rs b/src/bootstrap/src/core/config/flags.rs
index 2a301007ab4..27d0425df54 100644
--- a/src/bootstrap/src/core/config/flags.rs
+++ b/src/bootstrap/src/core/config/flags.rs
@@ -133,6 +133,13 @@ pub struct Flags {
     /// whether to use color in cargo and rustc output
     pub color: Color,
 
+    #[arg(global(true), long)]
+    /// Bootstrap uses this value to decide whether it should bypass locking the build process.
+    /// This is rarely needed (e.g., compiling the std library for different targets in parallel).
+    ///
+    /// Unless you know exactly what you are doing, you probably don't need this.
+    pub bypass_bootstrap_lock: bool,
+
     /// whether rebuilding llvm should be skipped, overriding `skip-rebuld` in config.toml
     #[arg(global(true), long, value_name = "VALUE")]
     pub llvm_skip_rebuild: Option<bool>,
diff --git a/src/bootstrap/src/lib.rs b/src/bootstrap/src/lib.rs
index 60a89e9bf07..13391b1faa1 100644
--- a/src/bootstrap/src/lib.rs
+++ b/src/bootstrap/src/lib.rs
@@ -83,8 +83,6 @@ const EXTRA_CHECK_CFGS: &[(Option<Mode>, &str, Option<&[&'static str]>)] = &[
     (Some(Mode::Std), "no_global_oom_handling", None),
     (Some(Mode::Std), "no_rc", None),
     (Some(Mode::Std), "no_sync", None),
-    (Some(Mode::Std), "freebsd12", None),
-    (Some(Mode::Std), "freebsd13", None),
     (Some(Mode::Std), "backtrace_in_libstd", None),
     /* Extra values not defined in the built-in targets yet, but used in std */
     (Some(Mode::Std), "target_env", Some(&["libnx"])),
diff --git a/src/ci/docker/host-x86_64/dist-various-2/Dockerfile b/src/ci/docker/host-x86_64/dist-various-2/Dockerfile
index 3f4e025111a..5f1fec74bed 100644
--- a/src/ci/docker/host-x86_64/dist-various-2/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-various-2/Dockerfile
@@ -76,8 +76,8 @@ RUN env \
     rm -rf /build/*
 
 WORKDIR /tmp
-COPY host-x86_64/dist-various-2/shared.sh /tmp/
-COPY host-x86_64/dist-various-2/build-fuchsia-toolchain.sh /tmp/
+COPY scripts/shared.sh /tmp/
+COPY scripts/build-fuchsia-toolchain.sh /tmp/
 RUN /tmp/build-fuchsia-toolchain.sh
 COPY host-x86_64/dist-various-2/build-solaris-toolchain.sh /tmp/
 RUN /tmp/build-solaris-toolchain.sh x86_64  amd64   solaris-i386  pc
diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-integration/Dockerfile b/src/ci/docker/host-x86_64/x86_64-gnu-integration/Dockerfile
new file mode 100644
index 00000000000..ba65ba9bed4
--- /dev/null
+++ b/src/ci/docker/host-x86_64/x86_64-gnu-integration/Dockerfile
@@ -0,0 +1,68 @@
+FROM ubuntu:22.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  build-essential \
+  g++ \
+  make \
+  ninja-build \
+  file \
+  curl \
+  ca-certificates \
+  python3 \
+  git \
+  cmake \
+  libssl-dev \
+  sudo \
+  xz-utils \
+  pkg-config \
+  unzip \
+  && rm -rf /var/lib/apt/lists/*
+
+# Duplicated in dist-various-2 Dockerfile.
+# FIXME: Move to canonical triple
+ENV \
+    AR_x86_64_fuchsia=x86_64-unknown-fuchsia-ar \
+    CC_x86_64_fuchsia=x86_64-unknown-fuchsia-clang \
+    CFLAGS_x86_64_fuchsia="--target=x86_64-unknown-fuchsia --sysroot=/usr/local/core-linux-amd64-fuchsia-sdk/arch/x64/sysroot -I/usr/local/core-linux-amd64-fuchsia-sdk/pkg/fdio/include" \
+    CXX_x86_64_fuchsia=x86_64-unknown-fuchsia-clang++ \
+    CXXFLAGS_x86_64_fuchsia="--target=x86_64-unknown-fuchsia --sysroot=/usr/local/core-linux-amd64-fuchsia-sdk/arch/x64/sysroot -I/usr/local/core-linux-amd64-fuchsia-sdk/pkg/fdio/include" \
+    LDFLAGS_x86_64_fuchsia="--target=x86_64-unknown-fuchsia --sysroot=/usr/local/core-linux-amd64-fuchsia-sdk/arch/x64/sysroot -L/usr/local/core-linux-amd64-fuchsia-sdk/arch/x64/lib"
+
+WORKDIR /tmp
+COPY scripts/shared.sh /tmp/
+COPY scripts/build-fuchsia-toolchain.sh /tmp/
+RUN /tmp/build-fuchsia-toolchain.sh
+
+ENV CARGO_TARGET_X86_64_FUCHSIA_AR /usr/local/bin/llvm-ar
+ENV CARGO_TARGET_X86_64_FUCHSIA_RUSTFLAGS \
+  -C panic=abort \
+  -C force-unwind-tables=yes \
+  -C link-arg=--sysroot=/usr/local/core-linux-amd64-fuchsia-sdk/arch/x64/sysroot \
+  -Lnative=/usr/local/core-linux-amd64-fuchsia-sdk/arch/x64/sysroot/lib \
+  -Lnative=/usr/local/core-linux-amd64-fuchsia-sdk/arch/x64/lib
+
+ENV TARGETS=x86_64-fuchsia
+ENV TARGETS=$TARGETS,x86_64-unknown-linux-gnu
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+ENV RUST_INSTALL_DIR /checkout/obj/install
+RUN mkdir -p $RUST_INSTALL_DIR/etc
+
+ENV RUST_CONFIGURE_ARGS \
+  --prefix=$RUST_INSTALL_DIR \
+  --sysconfdir=etc \
+  --enable-lld \
+  --llvm-libunwind=in-tree \
+  --enable-extended \
+  --disable-docs \
+  --set target.x86_64-fuchsia.cc=/usr/local/bin/clang \
+  --set target.x86_64-fuchsia.cxx=/usr/local/bin/clang++ \
+  --set target.x86_64-fuchsia.ar=/usr/local/bin/llvm-ar \
+  --set target.x86_64-fuchsia.ranlib=/usr/local/bin/llvm-ranlib \
+  --set target.x86_64-fuchsia.linker=/usr/local/bin/ld.lld
+ENV SCRIPT \
+    python3 ../x.py install --target $TARGETS compiler/rustc library/std clippy && \
+    bash ../src/ci/docker/host-x86_64/x86_64-gnu-integration/build-fuchsia.sh
diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-integration/build-fuchsia.sh b/src/ci/docker/host-x86_64/x86_64-gnu-integration/build-fuchsia.sh
new file mode 100755
index 00000000000..4a246f591d7
--- /dev/null
+++ b/src/ci/docker/host-x86_64/x86_64-gnu-integration/build-fuchsia.sh
@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+
+# Downloads and builds the Fuchsia operating system using a toolchain installed
+# in $RUST_INSTALL_DIR.
+
+set -euf -o pipefail
+
+INTEGRATION_SHA=66793c4894bf6204579bbee3b79956335f31c768
+PICK_REFS=()
+
+checkout=fuchsia
+jiri=.jiri_root/bin/jiri
+
+set -x
+
+# This script will:
+# - create a directory named "fuchsia" if it does not exist
+# - download "jiri" to "fuchsia/.jiri_root/bin"
+curl -s "https://fuchsia.googlesource.com/jiri/+/HEAD/scripts/bootstrap_jiri?format=TEXT" \
+    | base64 --decode \
+    | bash -s $checkout
+
+cd $checkout
+
+$jiri init \
+    -partial=true \
+    -analytics-opt=false \
+    .
+
+$jiri import \
+    -name=integration \
+    -revision=$INTEGRATION_SHA \
+    -overwrite=true \
+    flower \
+    "https://fuchsia.googlesource.com/integration"
+
+if [ -d ".git" ]; then
+    # Wipe out any local changes if we're reusing a checkout.
+    git checkout --force JIRI_HEAD
+fi
+
+$jiri update -autoupdate=false
+
+echo integration commit = $(git -C integration rev-parse HEAD)
+
+for git_ref in "${PICK_REFS[@]}"; do
+    git fetch https://fuchsia.googlesource.com/fuchsia $git_ref
+    git cherry-pick --no-commit FETCH_HEAD
+done
+
+bash scripts/rust/build_fuchsia_from_rust_ci.sh
diff --git a/src/ci/docker/host-x86_64/dist-various-2/build-fuchsia-toolchain.sh b/src/ci/docker/scripts/build-fuchsia-toolchain.sh
index d762b4672c6..beea2f522fd 100755
--- a/src/ci/docker/host-x86_64/dist-various-2/build-fuchsia-toolchain.sh
+++ b/src/ci/docker/scripts/build-fuchsia-toolchain.sh
@@ -4,13 +4,13 @@ set -ex
 source shared.sh
 
 FUCHSIA_SDK_URL=https://chrome-infra-packages.appspot.com/dl/fuchsia/sdk/core/linux-amd64
-FUCHSIA_SDK_ID=4xjxrGUrDbQ6_zJwj6cDN1IbWsWV5aCQXC_zO_Hu0XkC
-FUCHSIA_SDK_SHA256=e318f1ac652b0db43aff32708fa70337521b5ac595e5a0905c2ff33bf1eed179
+FUCHSIA_SDK_ID=MrhQwtmP8CpZre-i_PNOREcThbUcrX3bA-45d6WQr-cC
+FUCHSIA_SDK_SHA256=32b850c2d98ff02a59adefa2fcf34e44471385b51cad7ddb03ee3977a590afe7
 FUCHSIA_SDK_USR_DIR=/usr/local/core-linux-amd64-fuchsia-sdk
 CLANG_DOWNLOAD_URL=\
 https://chrome-infra-packages.appspot.com/dl/fuchsia/third_party/clang/linux-amd64
-CLANG_DOWNLOAD_ID=vU0vNjSihOV4Q6taQYCpy03JXGiCyVwxen3rFMNMIgsC
-CLANG_DOWNLOAD_SHA256=bd4d2f3634a284e57843ab5a4180a9cb4dc95c6882c95c317a7deb14c34c220b
+CLANG_DOWNLOAD_ID=Tpc85d1ZwSlZ6UKl2d96GRUBGNA5JKholOKe24sRDr0C
+CLANG_DOWNLOAD_SHA256=4e973ce5dd59c12959e942a5d9df7a19150118d03924a86894e29edb8b110ebd
 
 install_clang() {
   mkdir -p clang_download
diff --git a/src/ci/docker/host-x86_64/dist-various-2/shared.sh b/src/ci/docker/scripts/shared.sh
index 291f26bdaeb..9969659088d 100644
--- a/src/ci/docker/host-x86_64/dist-various-2/shared.sh
+++ b/src/ci/docker/scripts/shared.sh
@@ -1,5 +1,11 @@
-#!/usr/bin/env bash
-hide_output() {
+#!/bin/false
+# shellcheck shell=bash
+
+# This file is intended to be sourced with `. shared.sh` or
+# `source shared.sh`, hence the invalid shebang and not being
+# marked as an executable file in git.
+
+function hide_output {
   { set +x; } 2>/dev/null
   on_err="
 echo ERROR: An error was encountered with the build.
@@ -15,7 +21,8 @@ exit 1
   set -x
 }
 
-# Copied from ../../shared.sh
+# See https://unix.stackexchange.com/questions/82598
+# Duplicated in src/ci/shared.sh
 function retry {
   echo "Attempting with retry:" "$@"
   local n=1
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index 5b9c90273a3..800d8920951 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -470,6 +470,9 @@ jobs:
           - name: x86_64-gnu-aux
             <<: *job-linux-4c
 
+          - name: x86_64-gnu-integration
+            <<: *job-linux-16c
+
           - name: x86_64-gnu-debug
             <<: *job-linux-8c
 
@@ -730,6 +733,7 @@ jobs:
               CODEGEN_BACKENDS: llvm,cranelift
             <<: *job-linux-16c
 
+
   master:
     name: master
     runs-on: ubuntu-latest
diff --git a/src/ci/shared.sh b/src/ci/shared.sh
index 8a88c56194c..720394af249 100644
--- a/src/ci/shared.sh
+++ b/src/ci/shared.sh
@@ -8,7 +8,7 @@
 export MIRRORS_BASE="https://ci-mirrors.rust-lang.org/rustc"
 
 # See https://unix.stackexchange.com/questions/82598
-# Duplicated in docker/dist-various-2/shared.sh
+# Duplicated in docker/scripts/shared.sh
 function retry {
   echo "Attempting with retry:" "$@"
   local n=1
diff --git a/src/doc/rustc/src/SUMMARY.md b/src/doc/rustc/src/SUMMARY.md
index ad335389514..f46daca1f30 100644
--- a/src/doc/rustc/src/SUMMARY.md
+++ b/src/doc/rustc/src/SUMMARY.md
@@ -56,6 +56,7 @@
     - [\*-unknown-uefi](platform-support/unknown-uefi.md)
     - [wasm32-wasi-preview1-threads](platform-support/wasm32-wasi-preview1-threads.md)
     - [wasm64-unknown-unknown](platform-support/wasm64-unknown-unknown.md)
+    - [\*-win7-windows-msvc](platform-support/win7-windows-msvc.md)
     - [x86_64-fortanix-unknown-sgx](platform-support/x86_64-fortanix-unknown-sgx.md)
     - [x86_64-unknown-none](platform-support/x86_64-unknown-none.md)
     - [x86_64h-apple-darwin](platform-support/x86_64h-apple-darwin.md)
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index 457e8d90a43..5535e69c86a 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -276,6 +276,7 @@ target | std | host | notes
 [`i686-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | 32-bit OpenBSD [^x86_32-floats-return-ABI]
 `i686-uwp-windows-gnu` | ? |  | [^x86_32-floats-return-ABI]
 `i686-uwp-windows-msvc` | ? |  | [^x86_32-floats-return-ABI]
+[`i686-win7-windows-msvc`](platform-support/win7-windows-msvc.md) | ✓ |   | 32-bit Windows 7 support [^x86_32-floats-return-ABI]
 `i686-wrs-vxworks` | ? |  | [^x86_32-floats-return-ABI]
 [`m68k-unknown-linux-gnu`](platform-support/m68k-unknown-linux-gnu.md) | ? |  | Motorola 680x0 Linux
 `mips-unknown-linux-gnu` | ✓ | ✓ | MIPS Linux (kernel 4.4, glibc 2.23)
@@ -352,6 +353,7 @@ target | std | host | notes
 [`x86_64-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | 64-bit OpenBSD
 `x86_64-uwp-windows-gnu` | ✓ |  |
 `x86_64-uwp-windows-msvc` | ✓ |  |
+[`x86_64-win7-windows-msvc`](platform-support/win7-windows-msvc.md) | ✓ |   | 64-bit Windows 7 support
 `x86_64-wrs-vxworks` | ? |  |
 [`x86_64h-apple-darwin`](platform-support/x86_64h-apple-darwin.md) | ✓ | ✓ | macOS with late-gen Intel (at least Haswell)
 
diff --git a/src/doc/rustc/src/platform-support/win7-windows-msvc.md b/src/doc/rustc/src/platform-support/win7-windows-msvc.md
new file mode 100644
index 00000000000..96613fb9be4
--- /dev/null
+++ b/src/doc/rustc/src/platform-support/win7-windows-msvc.md
@@ -0,0 +1,80 @@
+# *-win7-windows-msvc
+
+**Tier: 3**
+
+Windows targets continuing support of windows7.
+
+## Target maintainers
+
+- @roblabla
+
+## Requirements
+
+This target supports all of core, alloc, std and test. This is automatically
+tested every night on private infrastructure hosted by the maintainer. Host
+tools may also work, though those are not currently tested.
+
+Those targets follow Windows calling convention for extern "C".
+
+Like any other Windows target, the created binaries are in PE format.
+
+## Building the target
+
+You can build Rust with support for the targets by adding it to the target list in config.toml:
+
+```toml
+[build]
+build-stage = 1
+target = [ "x86_64-win7-windows-msvc" ]
+```
+
+## Building Rust programs
+
+Rust does not ship pre-compiled artifacts for this target. To compile for this
+target, you will either need to build Rust with the target enabled (see
+"Building the target" above), or build your own copy by using `build-std` or
+similar.
+
+## Testing
+
+Created binaries work fine on Windows or Wine using native hardware. Remote
+testing is possible using the `remote-test-server` described [here](https://rustc-dev-guide.rust-lang.org/tests/running.html#running-tests-on-a-remote-machine).
+
+## Cross-compilation toolchains and C code
+
+Compatible C code can be built with either MSVC's `cl.exe` or LLVM's clang-cl.
+
+Cross-compilation is possible using clang-cl/lld-link. It also requires the
+Windows SDK, which can be acquired using [`xwin`](https://github.com/Jake-Shadle/xwin).
+
+- Install `clang-cl` and `lld-link` on your machine, and make sure they are in
+  your $PATH.
+- Install `xwin`: `cargo install xwin`
+- Use `xwin` to install the Windows SDK: `xwin splat --output winsdk`
+- Create an `xwin-lld-link` script with the following content:
+
+  ```bash
+  #!/usr/bin/env bash
+  set -e
+  XWIN=/path/to/winsdk
+  lld-link "$@" /libpath:$XWIN/crt/lib/x86_64 /libpath:$XWIN/sdk/lib/um/x86_64 /libpath:$XWIN/sdk/lib/ucrt/x86_64
+  ```
+
+- Create an `xwin-clang-cl` script with the following content:
+
+  ```bash
+  #!/usr/bin/env bash
+  set -e
+  XWIN=/path/to/winsdk
+  clang-cl /imsvc "$XWIN/crt/include" /imsvc "$XWIN/sdk/include/ucrt" /imsvc "$XWIN/sdk/include/um" /imsvc "$XWIN/sdk/include/shared" --target="x86_64-pc-windows-msvc" "$@"
+  ```
+
+- In your config.toml, add the following lines:
+
+  ```toml
+  [target.x86_64-win7-windows-msvc]
+  linker = "path/to/xwin-lld-link"
+  cc = "path/to/xwin-clang-cl"
+  ```
+
+You should now be able to cross-compile the Rust std, and any rust program.
diff --git a/src/doc/unstable-book/src/compiler-flags/tls-model.md b/src/doc/unstable-book/src/compiler-flags/tls-model.md
index 8b19e785c6a..b7024ba88de 100644
--- a/src/doc/unstable-book/src/compiler-flags/tls-model.md
+++ b/src/doc/unstable-book/src/compiler-flags/tls-model.md
@@ -20,6 +20,8 @@ loaded at program startup.
 The TLS data must not be in a library loaded after startup (via `dlopen`).
 - `local-exec` - model usable only if the TLS data is defined directly in the executable,
 but not in a shared library, and is accessed only from that executable.
+- `emulated` - Uses thread-specific data keys to implement emulated TLS.
+It is like using a general-dynamic TLS model for all modes.
 
 `rustc` and LLVM may use a more optimized model than specified if they know that we are producing
 an executable rather than a library, or that the `static` item is private enough.
diff --git a/src/etc/completions/x.py.fish b/src/etc/completions/x.py.fish
index 48796988868..99096307039 100644
--- a/src/etc/completions/x.py.fish
+++ b/src/etc/completions/x.py.fish
@@ -26,10 +26,11 @@ complete -c x.py -n "__fish_use_subcommand" -s i -l incremental -d 'use incremen
 complete -c x.py -n "__fish_use_subcommand" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_use_subcommand" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_use_subcommand" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_use_subcommand" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_use_subcommand" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_use_subcommand" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_use_subcommand" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
-complete -c x.py -n "__fish_use_subcommand" -s h -l help -d 'Print help'
+complete -c x.py -n "__fish_use_subcommand" -s h -l help -d 'Print help (see more with \'--help\')'
 complete -c x.py -n "__fish_use_subcommand" -f -a "build" -d 'Compile either the compiler or libraries'
 complete -c x.py -n "__fish_use_subcommand" -f -a "check" -d 'Compile either the compiler or libraries, using cargo check'
 complete -c x.py -n "__fish_use_subcommand" -f -a "clippy" -d 'Run Clippy (uses rustup/cargo-installed clippy binary)'
@@ -72,6 +73,7 @@ complete -c x.py -n "__fish_seen_subcommand_from build" -s i -l incremental -d '
 complete -c x.py -n "__fish_seen_subcommand_from build" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from build" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from build" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from build" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from build" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from build" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from build" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
@@ -105,6 +107,7 @@ complete -c x.py -n "__fish_seen_subcommand_from check" -s i -l incremental -d '
 complete -c x.py -n "__fish_seen_subcommand_from check" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from check" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from check" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from check" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from check" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from check" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from check" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
@@ -142,6 +145,7 @@ complete -c x.py -n "__fish_seen_subcommand_from clippy" -s i -l incremental -d
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from clippy" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from clippy" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
@@ -174,6 +178,7 @@ complete -c x.py -n "__fish_seen_subcommand_from fix" -s i -l incremental -d 'us
 complete -c x.py -n "__fish_seen_subcommand_from fix" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from fix" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from fix" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from fix" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from fix" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from fix" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from fix" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
@@ -207,6 +212,7 @@ complete -c x.py -n "__fish_seen_subcommand_from fmt" -s i -l incremental -d 'us
 complete -c x.py -n "__fish_seen_subcommand_from fmt" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from fmt" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from fmt" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from fmt" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from fmt" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from fmt" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from fmt" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
@@ -241,6 +247,7 @@ complete -c x.py -n "__fish_seen_subcommand_from doc" -s i -l incremental -d 'us
 complete -c x.py -n "__fish_seen_subcommand_from doc" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from doc" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from doc" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from doc" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from doc" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from doc" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from doc" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
@@ -286,6 +293,7 @@ complete -c x.py -n "__fish_seen_subcommand_from test" -s i -l incremental -d 'u
 complete -c x.py -n "__fish_seen_subcommand_from test" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from test" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from test" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from test" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from test" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from test" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from test" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
@@ -319,10 +327,11 @@ complete -c x.py -n "__fish_seen_subcommand_from bench" -s i -l incremental -d '
 complete -c x.py -n "__fish_seen_subcommand_from bench" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from bench" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from bench" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from bench" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from bench" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from bench" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from bench" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
-complete -c x.py -n "__fish_seen_subcommand_from bench" -s h -l help -d 'Print help'
+complete -c x.py -n "__fish_seen_subcommand_from bench" -s h -l help -d 'Print help (see more with \'--help\')'
 complete -c x.py -n "__fish_seen_subcommand_from clean" -l stage -d 'Clean a specific stage without touching other artifacts. By default, every stage is cleaned if this option is not used' -r
 complete -c x.py -n "__fish_seen_subcommand_from clean" -l config -d 'TOML configuration file for build' -r -F
 complete -c x.py -n "__fish_seen_subcommand_from clean" -l build-dir -d 'Build directory, overrides `build.build-dir` in `config.toml`' -r -f -a "(__fish_complete_directories)"
@@ -352,10 +361,11 @@ complete -c x.py -n "__fish_seen_subcommand_from clean" -s i -l incremental -d '
 complete -c x.py -n "__fish_seen_subcommand_from clean" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from clean" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from clean" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from clean" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from clean" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from clean" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from clean" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
-complete -c x.py -n "__fish_seen_subcommand_from clean" -s h -l help -d 'Print help'
+complete -c x.py -n "__fish_seen_subcommand_from clean" -s h -l help -d 'Print help (see more with \'--help\')'
 complete -c x.py -n "__fish_seen_subcommand_from dist" -l config -d 'TOML configuration file for build' -r -F
 complete -c x.py -n "__fish_seen_subcommand_from dist" -l build-dir -d 'Build directory, overrides `build.build-dir` in `config.toml`' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_seen_subcommand_from dist" -l build -d 'build target of the stage0 compiler' -r -f
@@ -384,10 +394,11 @@ complete -c x.py -n "__fish_seen_subcommand_from dist" -s i -l incremental -d 'u
 complete -c x.py -n "__fish_seen_subcommand_from dist" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from dist" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from dist" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from dist" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from dist" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from dist" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from dist" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
-complete -c x.py -n "__fish_seen_subcommand_from dist" -s h -l help -d 'Print help'
+complete -c x.py -n "__fish_seen_subcommand_from dist" -s h -l help -d 'Print help (see more with \'--help\')'
 complete -c x.py -n "__fish_seen_subcommand_from install" -l config -d 'TOML configuration file for build' -r -F
 complete -c x.py -n "__fish_seen_subcommand_from install" -l build-dir -d 'Build directory, overrides `build.build-dir` in `config.toml`' -r -f -a "(__fish_complete_directories)"
 complete -c x.py -n "__fish_seen_subcommand_from install" -l build -d 'build target of the stage0 compiler' -r -f
@@ -416,10 +427,11 @@ complete -c x.py -n "__fish_seen_subcommand_from install" -s i -l incremental -d
 complete -c x.py -n "__fish_seen_subcommand_from install" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from install" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from install" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from install" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from install" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from install" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from install" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
-complete -c x.py -n "__fish_seen_subcommand_from install" -s h -l help -d 'Print help'
+complete -c x.py -n "__fish_seen_subcommand_from install" -s h -l help -d 'Print help (see more with \'--help\')'
 complete -c x.py -n "__fish_seen_subcommand_from run" -l args -d 'arguments for the tool' -r
 complete -c x.py -n "__fish_seen_subcommand_from run" -l config -d 'TOML configuration file for build' -r -F
 complete -c x.py -n "__fish_seen_subcommand_from run" -l build-dir -d 'Build directory, overrides `build.build-dir` in `config.toml`' -r -f -a "(__fish_complete_directories)"
@@ -449,6 +461,7 @@ complete -c x.py -n "__fish_seen_subcommand_from run" -s i -l incremental -d 'us
 complete -c x.py -n "__fish_seen_subcommand_from run" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from run" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from run" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from run" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from run" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from run" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from run" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
@@ -481,6 +494,7 @@ complete -c x.py -n "__fish_seen_subcommand_from setup" -s i -l incremental -d '
 complete -c x.py -n "__fish_seen_subcommand_from setup" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from setup" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from setup" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from setup" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from setup" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from setup" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from setup" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
@@ -514,6 +528,7 @@ complete -c x.py -n "__fish_seen_subcommand_from suggest" -s i -l incremental -d
 complete -c x.py -n "__fish_seen_subcommand_from suggest" -l include-default-paths -d 'include default paths in addition to the provided ones'
 complete -c x.py -n "__fish_seen_subcommand_from suggest" -l dry-run -d 'dry run; don\'t build anything'
 complete -c x.py -n "__fish_seen_subcommand_from suggest" -l json-output -d 'use message-format=json'
+complete -c x.py -n "__fish_seen_subcommand_from suggest" -l bypass-bootstrap-lock -d 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)'
 complete -c x.py -n "__fish_seen_subcommand_from suggest" -l llvm-profile-generate -d 'generate PGO profile with llvm built for rustc'
 complete -c x.py -n "__fish_seen_subcommand_from suggest" -l enable-bolt-settings -d 'Enable BOLT link flags'
 complete -c x.py -n "__fish_seen_subcommand_from suggest" -l skip-stage0-validation -d 'Skip stage0 compiler validation'
diff --git a/src/etc/completions/x.py.ps1 b/src/etc/completions/x.py.ps1
index 2fed1be7269..7e926d10b3f 100644
--- a/src/etc/completions/x.py.ps1
+++ b/src/etc/completions/x.py.ps1
@@ -52,11 +52,12 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
-            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
-            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
+            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
+            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
             [CompletionResult]::new('build', 'build', [CompletionResultType]::ParameterValue, 'Compile either the compiler or libraries')
             [CompletionResult]::new('check', 'check', [CompletionResultType]::ParameterValue, 'Compile either the compiler or libraries, using cargo check')
             [CompletionResult]::new('clippy', 'clippy', [CompletionResultType]::ParameterValue, 'Run Clippy (uses rustup/cargo-installed clippy binary)')
@@ -105,6 +106,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
@@ -145,6 +147,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
@@ -189,6 +192,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
@@ -228,6 +232,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
@@ -268,6 +273,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
@@ -309,6 +315,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
@@ -361,6 +368,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
@@ -401,11 +409,12 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
-            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
-            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
+            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
+            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
             break
         }
         'x.py;clean' {
@@ -441,11 +450,12 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
-            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
-            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
+            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
+            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
             break
         }
         'x.py;dist' {
@@ -480,11 +490,12 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
-            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
-            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
+            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
+            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
             break
         }
         'x.py;install' {
@@ -519,11 +530,12 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
-            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
-            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
+            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
+            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help (see more with ''--help'')')
             break
         }
         'x.py;run' {
@@ -559,6 +571,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
@@ -598,6 +611,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
@@ -638,6 +652,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--include-default-paths', 'include-default-paths', [CompletionResultType]::ParameterName, 'include default paths in addition to the provided ones')
             [CompletionResult]::new('--dry-run', 'dry-run', [CompletionResultType]::ParameterName, 'dry run; don''t build anything')
             [CompletionResult]::new('--json-output', 'json-output', [CompletionResultType]::ParameterName, 'use message-format=json')
+            [CompletionResult]::new('--bypass-bootstrap-lock', 'bypass-bootstrap-lock', [CompletionResultType]::ParameterName, 'Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)')
             [CompletionResult]::new('--llvm-profile-generate', 'llvm-profile-generate', [CompletionResultType]::ParameterName, 'generate PGO profile with llvm built for rustc')
             [CompletionResult]::new('--enable-bolt-settings', 'enable-bolt-settings', [CompletionResultType]::ParameterName, 'Enable BOLT link flags')
             [CompletionResult]::new('--skip-stage0-validation', 'skip-stage0-validation', [CompletionResultType]::ParameterName, 'Skip stage0 compiler validation')
diff --git a/src/etc/completions/x.py.sh b/src/etc/completions/x.py.sh
index f22d7e3e131..78754f6e7b2 100644
--- a/src/etc/completions/x.py.sh
+++ b/src/etc/completions/x.py.sh
@@ -61,7 +61,7 @@ _x.py() {
 
     case "${cmd}" in
         x.py)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]... build check clippy fix fmt doc test bench clean dist install run setup suggest"
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]... build check clippy fix fmt doc test bench clean dist install run setup suggest"
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -171,7 +171,7 @@ _x.py() {
             return 0
             ;;
         x.py__bench)
-            opts="-v -i -j -h --test-args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --test-args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -285,7 +285,7 @@ _x.py() {
             return 0
             ;;
         x.py__build)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -395,7 +395,7 @@ _x.py() {
             return 0
             ;;
         x.py__check)
-            opts="-v -i -j -h --all-targets --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --all-targets --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -505,7 +505,7 @@ _x.py() {
             return 0
             ;;
         x.py__clean)
-            opts="-v -i -j -h --all --stage --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --all --stage --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -615,7 +615,7 @@ _x.py() {
             return 0
             ;;
         x.py__clippy)
-            opts="-A -D -W -F -v -i -j -h --fix --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-A -D -W -F -v -i -j -h --fix --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -741,7 +741,7 @@ _x.py() {
             return 0
             ;;
         x.py__dist)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -851,7 +851,7 @@ _x.py() {
             return 0
             ;;
         x.py__doc)
-            opts="-v -i -j -h --open --json --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --open --json --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -961,7 +961,7 @@ _x.py() {
             return 0
             ;;
         x.py__fix)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1071,7 +1071,7 @@ _x.py() {
             return 0
             ;;
         x.py__fmt)
-            opts="-v -i -j -h --check --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --check --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1181,7 +1181,7 @@ _x.py() {
             return 0
             ;;
         x.py__install)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1291,7 +1291,7 @@ _x.py() {
             return 0
             ;;
         x.py__run)
-            opts="-v -i -j -h --args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --args --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1405,7 +1405,7 @@ _x.py() {
             return 0
             ;;
         x.py__setup)
-            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [<PROFILE>|hook|vscode|link] [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [<PROFILE>|hook|vscode|link] [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1515,7 +1515,7 @@ _x.py() {
             return 0
             ;;
         x.py__suggest)
-            opts="-v -i -j -h --run --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --run --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
@@ -1625,7 +1625,7 @@ _x.py() {
             return 0
             ;;
         x.py__test)
-            opts="-v -i -j -h --no-fail-fast --skip --test-args --rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --verbose --incremental --config --build-dir --build --host --target --exclude --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --no-fail-fast --skip --test-args --rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --verbose --incremental --config --build-dir --build --host --target --exclude --include-default-paths --rustc-error-format --on-fail --dry-run --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --llvm-skip-rebuild --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
diff --git a/src/etc/completions/x.py.zsh b/src/etc/completions/x.py.zsh
index 1e5a7b5aa89..29dfc292615 100644
--- a/src/etc/completions/x.py.zsh
+++ b/src/etc/completions/x.py.zsh
@@ -46,11 +46,12 @@ _x.py() {
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
-'-h[Print help]' \
-'--help[Print help]' \
+'-h[Print help (see more with '\''--help'\'')]' \
+'--help[Print help (see more with '\''--help'\'')]' \
 '::paths -- paths for the subcommand:_files' \
 '::free_args -- arguments passed to subcommands:' \
 ":: :_x.py_commands" \
@@ -95,6 +96,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
@@ -137,6 +139,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
@@ -183,6 +186,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
@@ -224,6 +228,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
@@ -266,6 +271,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
@@ -309,6 +315,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
@@ -363,6 +370,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
@@ -405,11 +413,12 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
-'-h[Print help]' \
-'--help[Print help]' \
+'-h[Print help (see more with '\''--help'\'')]' \
+'--help[Print help (see more with '\''--help'\'')]' \
 '*::paths -- paths for the subcommand:_files' \
 && ret=0
 ;;
@@ -447,11 +456,12 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
-'-h[Print help]' \
-'--help[Print help]' \
+'-h[Print help (see more with '\''--help'\'')]' \
+'--help[Print help (see more with '\''--help'\'')]' \
 '*::paths -- paths for the subcommand:_files' \
 && ret=0
 ;;
@@ -488,11 +498,12 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
-'-h[Print help]' \
-'--help[Print help]' \
+'-h[Print help (see more with '\''--help'\'')]' \
+'--help[Print help (see more with '\''--help'\'')]' \
 '*::paths -- paths for the subcommand:_files' \
 && ret=0
 ;;
@@ -529,11 +540,12 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
-'-h[Print help]' \
-'--help[Print help]' \
+'-h[Print help (see more with '\''--help'\'')]' \
+'--help[Print help (see more with '\''--help'\'')]' \
 '*::paths -- paths for the subcommand:_files' \
 && ret=0
 ;;
@@ -571,6 +583,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
@@ -612,6 +625,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
@@ -655,6 +669,7 @@ _arguments "${_arguments_options[@]}" \
 '--include-default-paths[include default paths in addition to the provided ones]' \
 '--dry-run[dry run; don'\''t build anything]' \
 '--json-output[use message-format=json]' \
+'--bypass-bootstrap-lock[Bootstrap uses this value to decide whether it should bypass locking the build process. This is rarely needed (e.g., compiling the std library for different targets in parallel)]' \
 '--llvm-profile-generate[generate PGO profile with llvm built for rustc]' \
 '--enable-bolt-settings[Enable BOLT link flags]' \
 '--skip-stage0-validation[Skip stage0 compiler validation]' \
diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index b898eb5d381..6e61969a8c1 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -1081,15 +1081,9 @@ so that we can apply CSS-filters to change the arrow color in themes */
 }
 
 .item-info .stab {
-	/* This min-height is needed to unify the height of the stab elements because some of them
-	   have emojis.
-	*/
-	min-height: 36px;
-	display: flex;
+	display: block;
 	padding: 3px;
 	margin-bottom: 5px;
-	align-items: center;
-	vertical-align: text-bottom;
 }
 .item-name .stab {
 	margin-left: 0.3125em;
@@ -1112,17 +1106,26 @@ so that we can apply CSS-filters to change the arrow color in themes */
 	color: var(--stab-code-color);
 }
 
-.stab .emoji {
+.stab .emoji, .item-info .stab::before {
 	font-size: 1.25rem;
+}
+.stab .emoji {
 	margin-right: 0.3rem;
 }
+.item-info .stab::before {
+	/* ensure badges with emoji and without it have same height */
+	content: "\0";
+	width: 0;
+	display: inline-block;
+	color: transparent;
+}
 
 /* Black one-pixel outline around emoji shapes */
 .emoji {
 	text-shadow:
 		1px 0 0 black,
 		-1px 0 0 black,
-		0  1px 0 black,
+		0 1px 0 black,
 		0 -1px 0 black;
 }
 
diff --git a/src/librustdoc/html/static/js/storage.js b/src/librustdoc/html/static/js/storage.js
index c69641092ab..37250ba5a1f 100644
--- a/src/librustdoc/html/static/js/storage.js
+++ b/src/librustdoc/html/static/js/storage.js
@@ -51,22 +51,11 @@ function removeClass(elem, className) {
  * Run a callback for every element of an Array.
  * @param {Array<?>}    arr        - The array to iterate over
  * @param {function(?)} func       - The callback
- * @param {boolean}     [reversed] - Whether to iterate in reverse
  */
-function onEach(arr, func, reversed) {
-    if (arr && arr.length > 0) {
-        if (reversed) {
-            for (let i = arr.length - 1; i >= 0; --i) {
-                if (func(arr[i])) {
-                    return true;
-                }
-            }
-        } else {
-            for (const elem of arr) {
-                if (func(elem)) {
-                    return true;
-                }
-            }
+function onEach(arr, func) {
+    for (const elem of arr) {
+        if (func(elem)) {
+            return true;
         }
     }
     return false;
@@ -80,14 +69,12 @@ function onEach(arr, func, reversed) {
  * https://developer.mozilla.org/en-US/docs/Web/API/NodeList
  * @param {NodeList<?>|HTMLCollection<?>} lazyArray  - An array to iterate over
  * @param {function(?)}                   func       - The callback
- * @param {boolean}                       [reversed] - Whether to iterate in reverse
  */
 // eslint-disable-next-line no-unused-vars
-function onEachLazy(lazyArray, func, reversed) {
+function onEachLazy(lazyArray, func) {
     return onEach(
         Array.prototype.slice.call(lazyArray),
-        func,
-        reversed);
+        func);
 }
 
 function updateLocalStorage(name, value) {
diff --git a/src/tools/clippy/clippy_lints/src/doc/needless_doctest_main.rs b/src/tools/clippy/clippy_lints/src/doc/needless_doctest_main.rs
index 640d4a069ec..e019523e609 100644
--- a/src/tools/clippy/clippy_lints/src/doc/needless_doctest_main.rs
+++ b/src/tools/clippy/clippy_lints/src/doc/needless_doctest_main.rs
@@ -69,7 +69,7 @@ pub fn check(
                                 if !ignore {
                                     get_test_spans(&item, &mut test_attr_spans);
                                 }
-                                let is_async = matches!(sig.header.coro_kind, Some(CoroutineKind::Async { .. }));
+                                let is_async = matches!(sig.header.coroutine_kind, Some(CoroutineKind::Async { .. }));
                                 let returns_nothing = match &sig.decl.output {
                                     FnRetTy::Default(..) => true,
                                     FnRetTy::Ty(ty) if ty.kind.is_unit() => true,
diff --git a/src/tools/clippy/clippy_lints/src/non_expressive_names.rs b/src/tools/clippy/clippy_lints/src/non_expressive_names.rs
index 70b7ef1a5ea..ba9230dab7a 100644
--- a/src/tools/clippy/clippy_lints/src/non_expressive_names.rs
+++ b/src/tools/clippy/clippy_lints/src/non_expressive_names.rs
@@ -341,7 +341,9 @@ impl<'a, 'tcx> Visitor<'tcx> for SimilarNamesLocalVisitor<'a, 'tcx> {
 
         self.apply(|this| {
             SimilarNamesNameVisitor(this).visit_pat(&arm.pat);
-            this.apply(|this| walk_expr(this, &arm.body));
+            if let Some(body) = &arm.body {
+                this.apply(|this| walk_expr(this, body));
+            }
         });
 
         self.check_single_char_names();
diff --git a/src/tools/clippy/clippy_lints/src/redundant_else.rs b/src/tools/clippy/clippy_lints/src/redundant_else.rs
index 1168e79bb0d..001686c84f8 100644
--- a/src/tools/clippy/clippy_lints/src/redundant_else.rs
+++ b/src/tools/clippy/clippy_lints/src/redundant_else.rs
@@ -105,7 +105,9 @@ impl<'ast> Visitor<'ast> for BreakVisitor {
     fn visit_expr(&mut self, expr: &'ast Expr) {
         self.is_break = match expr.kind {
             ExprKind::Break(..) | ExprKind::Continue(..) | ExprKind::Ret(..) => true,
-            ExprKind::Match(_, ref arms) => arms.iter().all(|arm| self.check_expr(&arm.body)),
+            ExprKind::Match(_, ref arms) => arms.iter().all(|arm|
+                arm.body.is_none() || arm.body.as_deref().is_some_and(|body| self.check_expr(body))
+            ),
             ExprKind::If(_, ref then, Some(ref els)) => self.check_block(then) && self.check_expr(els),
             ExprKind::If(_, _, None)
             // ignore loops for simplicity
diff --git a/src/tools/clippy/clippy_utils/src/ast_utils.rs b/src/tools/clippy/clippy_utils/src/ast_utils.rs
index 12403bbff3c..47237de4fef 100644
--- a/src/tools/clippy/clippy_utils/src/ast_utils.rs
+++ b/src/tools/clippy/clippy_utils/src/ast_utils.rs
@@ -188,7 +188,7 @@ pub fn eq_expr(l: &Expr, r: &Expr) -> bool {
             Closure(box ast::Closure {
                 binder: lb,
                 capture_clause: lc,
-                coro_kind: la,
+                coroutine_kind: la,
                 movability: lm,
                 fn_decl: lf,
                 body: le,
@@ -197,7 +197,7 @@ pub fn eq_expr(l: &Expr, r: &Expr) -> bool {
             Closure(box ast::Closure {
                 binder: rb,
                 capture_clause: rc,
-                coro_kind: ra,
+                coroutine_kind: ra,
                 movability: rm,
                 fn_decl: rf,
                 body: re,
@@ -236,7 +236,7 @@ pub fn eq_field(l: &ExprField, r: &ExprField) -> bool {
 pub fn eq_arm(l: &Arm, r: &Arm) -> bool {
     l.is_placeholder == r.is_placeholder
         && eq_pat(&l.pat, &r.pat)
-        && eq_expr(&l.body, &r.body)
+        && eq_expr_opt(&l.body, &r.body)
         && eq_expr_opt(&l.guard, &r.guard)
         && over(&l.attrs, &r.attrs, eq_attr)
 }
@@ -563,10 +563,11 @@ pub fn eq_fn_sig(l: &FnSig, r: &FnSig) -> bool {
     eq_fn_decl(&l.decl, &r.decl) && eq_fn_header(&l.header, &r.header)
 }
 
-fn eq_opt_coro_kind(l: Option<CoroutineKind>, r: Option<CoroutineKind>) -> bool {
+fn eq_opt_coroutine_kind(l: Option<CoroutineKind>, r: Option<CoroutineKind>) -> bool {
     match (l, r) {
         (Some(CoroutineKind::Async { .. }), Some(CoroutineKind::Async { .. }))
-        | (Some(CoroutineKind::Gen { .. }), Some(CoroutineKind::Gen { .. })) => true,
+        | (Some(CoroutineKind::Gen { .. }), Some(CoroutineKind::Gen { .. }))
+        | (Some(CoroutineKind::AsyncGen { .. }), Some(CoroutineKind::AsyncGen { .. })) => true,
         (None, None) => true,
         _ => false,
     }
@@ -574,7 +575,7 @@ fn eq_opt_coro_kind(l: Option<CoroutineKind>, r: Option<CoroutineKind>) -> bool
 
 pub fn eq_fn_header(l: &FnHeader, r: &FnHeader) -> bool {
     matches!(l.unsafety, Unsafe::No) == matches!(r.unsafety, Unsafe::No)
-        && eq_opt_coro_kind(l.coro_kind, r.coro_kind)
+        && eq_opt_coroutine_kind(l.coroutine_kind, r.coroutine_kind)
         && matches!(l.constness, Const::No) == matches!(r.constness, Const::No)
         && eq_ext(&l.ext, &r.ext)
 }
diff --git a/src/tools/miri/rust-version b/src/tools/miri/rust-version
index 8841b0c95cb..73e201aa309 100644
--- a/src/tools/miri/rust-version
+++ b/src/tools/miri/rust-version
@@ -1 +1 @@
-d6fa38a9b2426487e010a6c16862132f89755e41
+61afc9c92896a43fce92bd5e3bba6274c5e3e960
diff --git a/src/tools/rustfmt/src/closures.rs b/src/tools/rustfmt/src/closures.rs
index c1ce87eadcb..f698f494ae5 100644
--- a/src/tools/rustfmt/src/closures.rs
+++ b/src/tools/rustfmt/src/closures.rs
@@ -29,7 +29,7 @@ pub(crate) fn rewrite_closure(
     binder: &ast::ClosureBinder,
     constness: ast::Const,
     capture: ast::CaptureBy,
-    coro_kind: &Option<ast::CoroutineKind>,
+    coroutine_kind: &Option<ast::CoroutineKind>,
     movability: ast::Movability,
     fn_decl: &ast::FnDecl,
     body: &ast::Expr,
@@ -40,7 +40,16 @@ pub(crate) fn rewrite_closure(
     debug!("rewrite_closure {:?}", body);
 
     let (prefix, extra_offset) = rewrite_closure_fn_decl(
-        binder, constness, capture, coro_kind, movability, fn_decl, body, span, context, shape,
+        binder,
+        constness,
+        capture,
+        coroutine_kind,
+        movability,
+        fn_decl,
+        body,
+        span,
+        context,
+        shape,
     )?;
     // 1 = space between `|...|` and body.
     let body_shape = shape.offset_left(extra_offset)?;
@@ -233,7 +242,7 @@ fn rewrite_closure_fn_decl(
     binder: &ast::ClosureBinder,
     constness: ast::Const,
     capture: ast::CaptureBy,
-    coro_kind: &Option<ast::CoroutineKind>,
+    coroutine_kind: &Option<ast::CoroutineKind>,
     movability: ast::Movability,
     fn_decl: &ast::FnDecl,
     body: &ast::Expr,
@@ -263,9 +272,10 @@ fn rewrite_closure_fn_decl(
     } else {
         ""
     };
-    let coro = match coro_kind {
+    let coro = match coroutine_kind {
         Some(ast::CoroutineKind::Async { .. }) => "async ",
         Some(ast::CoroutineKind::Gen { .. }) => "gen ",
+        Some(ast::CoroutineKind::AsyncGen { .. }) => "async gen ",
         None => "",
     };
     let mover = if matches!(capture, ast::CaptureBy::Value { .. }) {
@@ -343,7 +353,7 @@ pub(crate) fn rewrite_last_closure(
             ref binder,
             constness,
             capture_clause,
-            ref coro_kind,
+            ref coroutine_kind,
             movability,
             ref fn_decl,
             ref body,
@@ -364,7 +374,7 @@ pub(crate) fn rewrite_last_closure(
             binder,
             constness,
             capture_clause,
-            coro_kind,
+            coroutine_kind,
             movability,
             fn_decl,
             body,
diff --git a/src/tools/rustfmt/src/expr.rs b/src/tools/rustfmt/src/expr.rs
index 4515c27be37..a68bd6694ba 100644
--- a/src/tools/rustfmt/src/expr.rs
+++ b/src/tools/rustfmt/src/expr.rs
@@ -212,7 +212,7 @@ pub(crate) fn format_expr(
             &cl.binder,
             cl.constness,
             cl.capture_clause,
-            &cl.coro_kind,
+            &cl.coroutine_kind,
             cl.movability,
             &cl.fn_decl,
             &cl.body,
diff --git a/src/tools/rustfmt/src/items.rs b/src/tools/rustfmt/src/items.rs
index 4dff65f8cd0..a4256730f19 100644
--- a/src/tools/rustfmt/src/items.rs
+++ b/src/tools/rustfmt/src/items.rs
@@ -287,7 +287,7 @@ pub(crate) struct FnSig<'a> {
     decl: &'a ast::FnDecl,
     generics: &'a ast::Generics,
     ext: ast::Extern,
-    coro_kind: Cow<'a, Option<ast::CoroutineKind>>,
+    coroutine_kind: Cow<'a, Option<ast::CoroutineKind>>,
     constness: ast::Const,
     defaultness: ast::Defaultness,
     unsafety: ast::Unsafe,
@@ -302,7 +302,7 @@ impl<'a> FnSig<'a> {
     ) -> FnSig<'a> {
         FnSig {
             unsafety: method_sig.header.unsafety,
-            coro_kind: Cow::Borrowed(&method_sig.header.coro_kind),
+            coroutine_kind: Cow::Borrowed(&method_sig.header.coroutine_kind),
             constness: method_sig.header.constness,
             defaultness: ast::Defaultness::Final,
             ext: method_sig.header.ext,
@@ -328,7 +328,7 @@ impl<'a> FnSig<'a> {
                 generics,
                 ext: fn_sig.header.ext,
                 constness: fn_sig.header.constness,
-                coro_kind: Cow::Borrowed(&fn_sig.header.coro_kind),
+                coroutine_kind: Cow::Borrowed(&fn_sig.header.coroutine_kind),
                 defaultness,
                 unsafety: fn_sig.header.unsafety,
                 visibility: vis,
@@ -343,8 +343,8 @@ impl<'a> FnSig<'a> {
         result.push_str(&*format_visibility(context, self.visibility));
         result.push_str(format_defaultness(self.defaultness));
         result.push_str(format_constness(self.constness));
-        self.coro_kind
-            .map(|coro_kind| result.push_str(format_coro(&coro_kind)));
+        self.coroutine_kind
+            .map(|coroutine_kind| result.push_str(format_coro(&coroutine_kind)));
         result.push_str(format_unsafety(self.unsafety));
         result.push_str(&format_extern(
             self.ext,
diff --git a/src/tools/rustfmt/src/matches.rs b/src/tools/rustfmt/src/matches.rs
index 95b0ed16db8..ef509b56837 100644
--- a/src/tools/rustfmt/src/matches.rs
+++ b/src/tools/rustfmt/src/matches.rs
@@ -223,7 +223,7 @@ fn rewrite_match_arm(
 ) -> Option<String> {
     let (missing_span, attrs_str) = if !arm.attrs.is_empty() {
         if contains_skip(&arm.attrs) {
-            let (_, body) = flatten_arm_body(context, &arm.body, None);
+            let (_, body) = flatten_arm_body(context, arm.body.as_deref()?, None);
             // `arm.span()` does not include trailing comma, add it manually.
             return Some(format!(
                 "{}{}",
@@ -246,7 +246,7 @@ fn rewrite_match_arm(
     };
 
     // Patterns
-    let pat_shape = match &arm.body.kind {
+    let pat_shape = match &arm.body.as_ref()?.kind {
         ast::ExprKind::Block(_, Some(label)) => {
             // Some block with a label ` => 'label: {`
             // 7 = ` => : {`
@@ -280,10 +280,10 @@ fn rewrite_match_arm(
         false,
     )?;
 
-    let arrow_span = mk_sp(arm.pat.span.hi(), arm.body.span().lo());
+    let arrow_span = mk_sp(arm.pat.span.hi(), arm.body.as_ref()?.span().lo());
     rewrite_match_body(
         context,
-        &arm.body,
+        arm.body.as_ref()?,
         &lhs_str,
         shape,
         guard_str.contains('\n'),
diff --git a/src/tools/rustfmt/src/spanned.rs b/src/tools/rustfmt/src/spanned.rs
index 2136cfeae1a..5960b144499 100644
--- a/src/tools/rustfmt/src/spanned.rs
+++ b/src/tools/rustfmt/src/spanned.rs
@@ -97,7 +97,12 @@ impl Spanned for ast::Arm {
         } else {
             self.attrs[0].span.lo()
         };
-        span_with_attrs_lo_hi!(self, lo, self.body.span.hi())
+        let hi = if let Some(body) = &self.body {
+            body.span.hi()
+        } else {
+            self.pat.span.hi()
+        };
+        span_with_attrs_lo_hi!(self, lo, hi)
     }
 }
 
diff --git a/src/tools/rustfmt/src/utils.rs b/src/tools/rustfmt/src/utils.rs
index 5805e417c04..7d7bbf11529 100644
--- a/src/tools/rustfmt/src/utils.rs
+++ b/src/tools/rustfmt/src/utils.rs
@@ -75,10 +75,11 @@ pub(crate) fn format_visibility(
 }
 
 #[inline]
-pub(crate) fn format_coro(coro_kind: &ast::CoroutineKind) -> &'static str {
-    match coro_kind {
+pub(crate) fn format_coro(coroutine_kind: &ast::CoroutineKind) -> &'static str {
+    match coroutine_kind {
         ast::CoroutineKind::Async { .. } => "async ",
         ast::CoroutineKind::Gen { .. } => "gen ",
+        ast::CoroutineKind::AsyncGen { .. } => "async gen ",
     }
 }
 
diff --git a/src/tools/tidy/src/main.rs b/src/tools/tidy/src/main.rs
index 80e58ba00fc..9f92b8995b7 100644
--- a/src/tools/tidy/src/main.rs
+++ b/src/tools/tidy/src/main.rs
@@ -132,6 +132,7 @@ fn main() {
         check!(edition, &library_path);
 
         check!(alphabetical, &src_path);
+        check!(alphabetical, &tests_path);
         check!(alphabetical, &compiler_path);
         check!(alphabetical, &library_path);