Add initial dpcpp download

.github/actions/do_build_dpcpp/action.yml

@@ -4,6 +4,10 @@ description: build dpc++
 inputs:
   target:
     description: 'target architecture'
+  build:
+    description: 'build not download'
+    type: boolean
+    default: true
 
 runs:
   using: "composite"
@@ -23,12 +27,14 @@ runs:
         sudo apt-get install spirv-tools
 
     - name: clone dpc++
+      if: build ==  'true'
       uses: actions/checkout@v4
       with:
         repository: intel/llvm
         path: llvm
 
     - name: dpcpp configure
+      if: build ==  'true'
       shell: bash
       run:
         cd llvm; python buildbot/configure.py
@@ -39,17 +45,21 @@ runs:
         --cmake-opt=-DNATIVECPU_USE_OCK=ON
         --cmake-opt=-DLLVM_ENABLE_ZLIB=OFF
         --cmake-opt=-DLLVM_ENABLE_ZSTD=OFF
+
     - name: build sycl-headers
+      if: build ==  'true'
       shell: bash
       run:
         cmake --build llvm/build -- sycl-headers
 
     - name: build dpc plus plus
+      if: build ==  'true'
       shell: bash
       run:
        python llvm/buildbot/compile.py -o llvm/build -v -j 8
 
     - name: build extra utilties
+      if: build ==  'true'
       # Build various utilities, since those aren't proper dependencies.
       # FileCheck and not are needed for tests. The rest are needed for
       # cross builds. They are enabled on all targets for consistency.
@@ -66,6 +76,7 @@ runs:
         llvm-tblgen not opt prepare_builtins ../install/bin
 
     - name: install config files to pick up libraries for cross compilation.
+      if: build ==  'true'
       shell: bash
       run: |
         echo Installing configuration files
@@ -79,6 +90,15 @@ runs:
           " >../install/bin/$arch-unknown-linux-gnu.cfg;
         done
 
+    - name: download dpc plus plus
+      if: build == 'false'
+      shell: bash
+      run: |
+        mkdir -p llvm/build/install
+        cd llvm/build/install
+        wget -q https://github.com/intel/llvm/releases/download/nightly-2024-12-04/sycl_linux.tar.gz
+        tar xf sycl_linux.tar.gz
+
     - name: upload dpcpp artifact
       uses: actions/upload-artifact@v4
       with:

.github/workflows/planned_testing.yml

@@ -135,6 +135,7 @@ jobs:
         uses: ./.github/actions/do_build_dpcpp
         with:
           target: ${{ matrix.target }}
+          build: false
 
   build_sycl_cts:
     needs: [workflow_vars, build_icd, build_dpcpp_native_host]