Upgrade the version of Clang used in the build, move MSVC builds to Server 2022

Author: dpaoliello

src/ci/docker/host-x86_64/dist-x86_64-linux/build-clang.sh

@@ -4,6 +4,7 @@ set -ex
 
 source shared.sh
 
+# Try to keep the LLVM version here in sync with src/ci/scripts/install-clang.sh
 LLVM=llvmorg-18.1.0
 
 mkdir llvm-project

src/ci/github-actions/jobs.yml

@@ -36,10 +36,6 @@ runners:
     os: windows-2019-8core-32gb
     <<: *base-job
 
-  - &job-windows-2019-16c
-    os: windows-2019-16core-64gb
-    <<: *base-job
-
   - &job-aarch64-linux
     os: [ self-hosted, ARM64, linux ]
 
@@ -349,21 +345,21 @@ auto:
     env:
       RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --enable-profiler
       SCRIPT: make ci-msvc
-    <<: *job-windows-2019-8c
+    <<: *job-windows-8c
 
   - image: i686-msvc
     env:
       RUST_CONFIGURE_ARGS: --build=i686-pc-windows-msvc
       SCRIPT: make ci-msvc
-    <<: *job-windows-2019-8c
+    <<: *job-windows-8c
 
   - image: x86_64-msvc-ext
     env:
       SCRIPT: python x.py --stage 2 test src/tools/cargotest src/tools/cargo && src/ci/docker/host-x86_64/x86_64-gnu-tools/checktools.sh x.py /tmp/toolstate/toolstates.json windows
       HOST_TARGET: x86_64-pc-windows-msvc
       RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --enable-lld --save-toolstates=/tmp/toolstate/toolstates.json
       DEPLOY_TOOLSTATES_JSON: toolstates-windows.json
-    <<: *job-windows-2019-8c
+    <<: *job-windows-8c
 
   # 32/64-bit MinGW builds.
   #
@@ -414,7 +410,7 @@ auto:
         --set rust.codegen-units=1
       SCRIPT: python x.py build --set rust.debug=true opt-dist && PGO_HOST=x86_64-pc-windows-msvc ./build/x86_64-pc-windows-msvc/stage0-tools-bin/opt-dist windows-ci -- python x.py dist bootstrap --include-default-paths
       DIST_REQUIRE_ALL_TOOLS: 1
-    <<: *job-windows-2019-8c
+    <<: *job-windows-8c
 
   - image: dist-i686-msvc
     env:
@@ -426,8 +422,11 @@ auto:
         --enable-profiler
       SCRIPT: python x.py dist bootstrap --include-default-paths
       DIST_REQUIRE_ALL_TOOLS: 1
-    <<: *job-windows-2019-8c
+    <<: *job-windows-8c
 
+  # FIXME: There is a Clang bug that prevents using the VS 2022 STL when
+  # building for ARM64: https://github.com/llvm/llvm-project/pull/81849
+  # This is fixed in LLVM 19, but can't be backported to LLVM 18.
   - image: dist-aarch64-msvc
     env:
       RUST_CONFIGURE_ARGS: >-
@@ -471,4 +470,4 @@ auto:
     env:
       RUST_CONFIGURE_ARGS: --build=x86_64-pc-windows-msvc --enable-extended --enable-profiler
       SCRIPT: python x.py dist bootstrap --include-default-paths
-    <<: *job-windows-2019-8c
+    <<: *job-windows-8c

src/ci/scripts/install-clang.sh

@@ -10,18 +10,24 @@ IFS=$'\n\t'
 source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
 
 # Update both macOS's and Windows's tarballs when bumping the version here.
-LLVM_VERSION="14.0.5"
+# Try to keep this in sync with src/ci/docker/host-x86_64/dist-x86_64-linux/build-clang.sh
+LLVM_VERSION="18.1.4"
 
 if isMacOS; then
+    # FIXME: This is the latest pre-built version of LLVM that's available for
+    # x86_64 MacOS. We may want to consider bulding our own LLVM binaries
+    # instead, or set `USE_XCODE_CLANG` like AArch64 does.
+    LLVM_VERSION="15.0.7"
+
     # If the job selects a specific Xcode version, use that instead of
     # downloading our own version.
     if [[ ${USE_XCODE_CLANG-0} -eq 1 ]]; then
         bindir="$(xcode-select --print-path)/Toolchains/XcodeDefault.xctoolchain/usr/bin"
     else
-        file="${MIRRORS_BASE}/clang%2Bllvm-${LLVM_VERSION}-x86_64-apple-darwin.tar.xz"
-        retry curl -f "${file}" -o "clang+llvm-${LLVM_VERSION}-x86_64-apple-darwin.tar.xz"
-        tar xJf "clang+llvm-${LLVM_VERSION}-x86_64-apple-darwin.tar.xz"
-        bindir="$(pwd)/clang+llvm-${LLVM_VERSION}-x86_64-apple-darwin/bin"
+        file="${MIRRORS_BASE}/clang%2Bllvm-${LLVM_VERSION}-x86_64-apple-darwin21.0.tar.xz"
+        retry curl -f "${file}" -o "clang+llvm-${LLVM_VERSION}-x86_64-apple-darwin21.0.tar.xz"
+        tar xJf "clang+llvm-${LLVM_VERSION}-x86_64-apple-darwin21.0.tar.xz"
+        bindir="$(pwd)/clang+llvm-${LLVM_VERSION}-x86_64-apple-darwin21.0/bin"
     fi
 
     ciCommandSetEnv CC "${bindir}/clang"