workflows/release-binaries: Enable builds on Linux/AArch64 (#120786)

Author: tstellar

.github/workflows/release-binaries-all.yml

@@ -83,6 +83,7 @@ jobs:
       matrix:
         runs-on:
           - ubuntu-22.04
+          - ubuntu-22.04-arm
           - macos-13
           - macos-14
 

.github/workflows/release-binaries.yml

@@ -18,6 +18,7 @@ on:
         type: choice
         options:
           - ubuntu-22.04
+          - ubuntu-22.04-arm
           - macos-13
           - macos-14
 
@@ -55,6 +56,7 @@ jobs:
       ref: ${{ steps.vars.outputs.ref }}
       upload: ${{ steps.vars.outputs.upload }}
       target-cmake-flags: ${{ steps.vars.outputs.target-cmake-flags }}
+      ccache: ${{ steps.vars.outputs.ccache }}
       build-flang: ${{ steps.vars.outputs.build-flang }}
       enable-pgo: ${{ steps.vars.outputs.enable-pgo }}
       release-binary-basename: ${{ steps.vars.outputs.release-binary-basename }}
@@ -119,8 +121,16 @@ jobs:
         echo "release-binary-basename=$release_binary_basename" >> $GITHUB_OUTPUT
         echo "release-binary-filename=$release_binary_basename.tar.xz" >> $GITHUB_OUTPUT
 
-        # Detect necessary CMake flags
         target="$RUNNER_OS-$RUNNER_ARCH"
+        # The hendrikmuhs/ccache-action action does not support installing sccache
+        # on arm64 Linux.
+        if [ "$target" = "Linux-ARM64" ]; then
+          echo ccache=ccache >> $GITHUB_OUTPUT
+        else
+          echo ccache=sccache >> $GITHUB_OUTPUT
+        fi
+
+        # Detect necessary CMake flags
         echo "enable-pgo=false" >> $GITHUB_OUTPUT
         target_cmake_flags="-DLLVM_RELEASE_ENABLE_PGO=OFF"
         # The macOS builds try to cross compile some libraries so we need to
@@ -146,7 +156,7 @@ jobs:
         echo "target-cmake-flags=$target_cmake_flags" >> $GITHUB_OUTPUT
         echo "build-flang=$build_flang" >> $GITHUB_OUTPUT
         case "${{ inputs.runs-on }}" in
-          ubuntu-22.04)
+          ubuntu-22.04*)
             build_runs_on="depot-${{ inputs.runs-on }}-16"
             test_runs_on=$build_runs_on
             ;;
@@ -221,12 +231,14 @@ jobs:
       with:
         # Default to 2G to workaround: https://github.com/hendrikmuhs/ccache-action/issues/174
         max-size: 2G
-        key: sccache-${{ runner.os }}-${{ runner.arch }}-release
-        variant: sccache
+        key: ${{ needs.prepare.outputs.ccache }}-${{ runner.os }}-${{ runner.arch }}-release
+        variant: ${{ needs.prepare.outputs.ccache }}
 
     - name: Configure
       id: build
       shell: bash
+      env:
+        CCACHE_BIN: ${{ needs.prepare.outputs.ccache }}
       run: |
         # There were some issues on the ARM64 MacOS runners with trying to build x86 object,
         # so we need to set some extra cmake flags to disable this.
@@ -235,8 +247,8 @@ jobs:
             -C clang/cmake/caches/Release.cmake \
             -DBOOTSTRAP_LLVM_PARALLEL_LINK_JOBS=1 \
             -DBOOTSTRAP_CPACK_PACKAGE_FILE_NAME="${{ needs.prepare.outputs.release-binary-basename }}" \
-            -DCMAKE_C_COMPILER_LAUNCHER=sccache \
-            -DCMAKE_CXX_COMPILER_LAUNCHER=sccache
+            -DCMAKE_C_COMPILER_LAUNCHER=$CCACHE_BIN \
+            -DCMAKE_CXX_COMPILER_LAUNCHER=$CCACHE_BIN
     - name: Build
       shell: bash
       run: |