Use native LLVM build tools

Author: adazem009

.ci/common/build.sh

@@ -13,7 +13,7 @@ mkdir -p "$BUILD_DIR"
 if [[ "$PLATFORM" == "win64" ]] || [[ "$PLATFORM" == "win32" ]]; then
 	cmake -B "$BUILD_DIR" -G "Ninja" -DCMAKE_BUILD_TYPE=Release -DSCRATCHCPP_PLAYER_BUILD_UNIT_TESTS=OFF || exit 3
 elif [[ "$PLATFORM" == "linux_aarch64" ]]; then
-	cmake -B "$BUILD_DIR" -DCMAKE_BUILD_TYPE=Release -DSCRATCHCPP_PLAYER_BUILD_UNIT_TESTS=OFF -DCMAKE_PREFIX_PATH="$QT_ROOT_DIR" -DCMAKE_TOOLCHAIN_FILE="$BUILD_TOOLCHAIN_CONFIG" -DCMAKE_FIND_ROOT_PATH="$QT_ROOT_DIR" -DQT_HOST_PATH="$QT_HOST_PATH" -DQT_HOST_CMAKE_DIR="$QT_HOST_PATH/lib/cmake"
+	cmake -B "$BUILD_DIR" -DCMAKE_BUILD_TYPE=Release -DSCRATCHCPP_PLAYER_BUILD_UNIT_TESTS=OFF -DCMAKE_PREFIX_PATH="$QT_ROOT_DIR" -DCMAKE_TOOLCHAIN_FILE="$BUILD_TOOLCHAIN_CONFIG" -DCMAKE_FIND_ROOT_PATH="$QT_ROOT_DIR" -DQT_HOST_PATH="$QT_HOST_PATH" -DQT_HOST_CMAKE_DIR="$QT_HOST_PATH/lib/cmake" -DLLVM_NATIVE_TOOL_DIR="$LLVM_PATH/bin"
 else
 	cmake -B "$BUILD_DIR" -DCMAKE_BUILD_TYPE=Release -DSCRATCHCPP_PLAYER_BUILD_UNIT_TESTS=OFF || exit 3
 fi

.github/workflows/linux-build.yml

@@ -103,6 +103,14 @@ jobs:
       with:
         path: ./qt-cross/
         key: qt-cross-${{ runner.os }}-${{ matrix.qt-version }}-${{ matrix.qt-target }}-${{ matrix.qt-modules }}-${{ matrix.arch }}
+    ## Install LLVM (for host build tools)
+    - if: "!contains(matrix.arch, 'amd64')"
+      name: Install LLVM
+      uses: KyleMayes/install-llvm-action@v2
+      with:
+        version: "19.1.0"
+        env: false
+        directory: ${{ runner.temp }}/llvm # get this from $LLVM_PATH
     ## Build
     - name: Build AppImage
       run: .ci/build_appimage.sh ${{ matrix.arch }}