[WIP] ci: Add LLVM toolchain build job

.github/workflows/ci.yml

@@ -833,6 +833,175 @@ jobs:
           md5.sum
           sha256.sum
 
+  # Build LLVM toolchain
+  build-llvm-toolchain:
+    name: LLVM Toolchain (${{ matrix.host.name }})
+    needs: setup
+    runs-on:
+      group: ${{ matrix.host.runner }}
+    container: ${{ matrix.host.container }}
+
+    defaults:
+      run:
+        shell: bash
+
+    strategy:
+      fail-fast: false
+      matrix:
+        host: ${{ fromJSON(needs.setup.outputs.hosts) }}
+
+    steps:
+    - name: Set up build environment (Linux)
+      if: ${{ runner.os == 'Linux' }}
+      run: |
+        # Create workspace directory
+        WORKSPACE="${RUNNER_TEMP}/workspace"
+        sudo mkdir -p ${WORKSPACE}
+
+        # Clean up working directories
+        shopt -s dotglob
+        sudo rm -rf ${GITHUB_WORKSPACE}/*
+        sudo rm -rf ${WORKSPACE}/*
+        shopt -u dotglob
+
+        # Allow non-root access to the working directories
+        sudo chmod -R 777 ${GITHUB_WORKSPACE}
+        sudo chmod -R 777 ${RUNNER_TEMP}
+
+        # Install common dependencies
+        sudo apt-get update
+        sudo apt-get install -y qemu-system
+
+        # Install dependencies for cross compilation
+        if [ "${{ matrix.host.name }}" == "windows-x86_64" ]; then
+          # Install MinGW-w64 cross toolchain
+          sudo apt-get install -y binutils-mingw-w64 gcc-mingw-w64 \
+                                  g++-mingw-w64
+        fi
+
+        # Set environment variables
+        echo "TAR=tar" >> $GITHUB_ENV
+        echo "WORKSPACE=${WORKSPACE}" >> $GITHUB_ENV
+
+    - name: Set up build environment (macOS)
+      if: ${{ runner.os == 'macOS' }}
+      run: |
+        # Delete workspace from the previous run
+        WORKSPACE="/Volumes/Workspace"
+        if [ -d ${WORKSPACE} ]; then
+          # Get disk device name
+          OLDDISK=$(diskutil info -plist "${WORKSPACE}" |
+                    plutil -extract ParentWholeDisk xml1 - -o - |
+                    sed -n "s/.*<string>\(.*\)<\/string>.*/\1/p")
+
+          # Force unmount and eject to deallocate disk blocks
+          if [ ! -z "${OLDDISK}" ]; then
+            diskutil unmountDisk force ${OLDDISK}
+            diskutil eject ${OLDDISK}
+          fi
+        fi
+
+        # Clean up working directories
+        shopt -s dotglob
+        rm -rf ${GITHUB_WORKSPACE}/*
+        rm -f ${RUNNER_TEMP}/Workspace.sparseimage
+        shopt -u dotglob
+
+        # Create case-sensitive workspace volume for macOS
+        hdiutil create ${RUNNER_TEMP}/Workspace.sparseimage \
+                       -volname Workspace -type SPARSE -size 150g -fs HFSX
+        hdiutil mount ${RUNNER_TEMP}/Workspace.sparseimage -mountpoint ${WORKSPACE}
+
+        # Install dependencies
+        brew install qemu
+
+        # Set environment variables
+        echo "TAR=gtar" >> $GITHUB_ENV
+        echo "WORKSPACE=${WORKSPACE}" >> $GITHUB_ENV
+
+    - name: Check out source code
+      if: ${{ github.event_name != 'pull_request_target' }}
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+        persist-credentials: false
+
+    - name: Check out source code (pull request)
+      if: ${{ github.event_name == 'pull_request_target' }}
+      uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        submodules: recursive
+        persist-credentials: false
+
+    - name: Setup debug session (pre)
+      if: always() && needs.setup.outputs.debug == 'toolchain-pre'
+      uses: mxschmitt/action-tmate@v3
+      with:
+        limit-access-to-actor: true
+
+    - name: Build LLVM toolchain
+      run: |
+        # Create build directory
+        pushd ${WORKSPACE}
+        mkdir -p llvm-build
+        cd llvm-build
+
+        # Configure and generate LLVM build scripts
+        if [ "${{ matrix.host.name }}" == "windows-x86_64" ]; then
+          LLVM_CMAKE_ARGS+="-DLLVM_TOOLCHAIN_CROSS_BUILD_MINGW=ON "
+        elif [ "${{ matrix.host.name }}" == "macos-aarch64" ]; then
+          LLVM_CMAKE_ARGS+="-DCMAKE_OSX_ARCHITECTURES=arm64 "
+        elif [ "${{ matrix.host.name }}" == "macos-x86_64" ]; then
+          LLVM_CMAKE_ARGS+="-DCMAKE_OSX_ARCHITECTURES=x86_64 "
+        fi
+
+        cmake \
+          -GNinja \
+          ${LLVM_CMAKE_ARGS} \
+          ${GITHUB_WORKSPACE}/scripts/llvm \
+          |& tee ${GITHUB_WORKSPACE}/llvm-cmake.log
+
+        # Build LLVM toolchain
+        ninja llvm-toolchain |& tee ${GITHUB_WORKSPACE}/llvm-build.log
+
+        # Run LLVM tests
+        ninja check-llvm-toolchain |& tee ${GITHUB_WORKSPACE}/llvm-test.log
+
+        # Package
+        ninja package-llvm-toolchain |& tee ${GITHUB_WORKSPACE}/llvm-package.log
+        popd
+
+        # Prepare archive
+        ARCHIVE_NAME=toolchain_gnu_${{ matrix.host.name }}
+        ARCHIVE_FILE=${ARCHIVE_NAME}.${{ matrix.host.archive }}
+
+        # Compute checksum
+        md5sum ${ARCHIVE_FILE} > md5.sum
+        sha256sum ${ARCHIVE_FILE} > sha256.sum
+
+    - name: Setup debug session (post)
+      if: always() && needs.setup.outputs.debug == 'toolchain-post'
+      uses: mxschmitt/action-tmate@v3
+      with:
+        limit-access-to-actor: true
+
+    - name: Upload toolchain build log
+      if: always()
+      uses: actions/upload-artifact@v4
+      with:
+        name: log_toolchain_llvm_${{ matrix.host.name }}
+        path: '*.log'
+
+    - name: Upload toolchain build artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: toolchain_llvm_${{ matrix.host.name }}
+        path: |
+          toolchain_llvm_${{ matrix.host.name }}.${{ matrix.host.archive }}
+          md5.sum
+          sha256.sum
+
   # Build host tools
   build-hosttools:
     name: Host Tools (${{ matrix.host.name }})
@@ -1075,7 +1244,7 @@ jobs:
   # Build distribution bundle
   build-dist-bundle:
     name: Distribution Bundle (${{ matrix.host.name }})
-    needs: [ setup, build-gnu-toolchain, build-hosttools, build-cmake-pkg ]
+    needs: [ setup, build-gnu-toolchain, build-llvm-toolchain, build-hosttools, build-cmake-pkg ]
     runs-on:
       group: ${{ matrix.host.runner }}
     container: ${{ matrix.host.container }}