[CI][UR][Offload] Add Offload build-only job (#18700)

Add a new job that verifies that the offload adapter can be built.
It does not attempt to run any tests or detect any hardware.

---------

Co-authored-by: Kenneth Benzie (Benie) <[email protected]>

Author: RossBrunton

.github/workflows/sycl-detect-changes.yml

@@ -84,6 +84,10 @@ jobs:
               - .github/workflows/ur-*
             ur_cuda_adapter:
               - 'unified-runtime/source/adapters/cuda/**'
+            ur_offload_adapter:
+              - 'unified-runtime/include/**'
+              - 'unified-runtime/source/adapters/offload/**'
+              - '.github/workflows/ur-build-offload.yml'
 
       - name: Set output
         id: result
@@ -94,7 +98,7 @@ jobs:
               return '${{ steps.changes.outputs.changes }}';
             }
             // Treat everything as changed for huge PRs.
-            return ["llvm", "llvm_spirv", "clang", "sycl_jit", "xptifw", "libclc", "sycl", "ci", "esimd", "ur", "ur_cuda_adapter"];
+            return ["llvm", "llvm_spirv", "clang", "sycl_jit", "xptifw", "libclc", "sycl", "ci", "esimd", "ur", "ur_cuda_adapter", "ur_offload_adapter"];
 
       - run: echo '${{ steps.result.outputs.result }}'
 

.github/workflows/ur-build-offload.yml

@@ -0,0 +1,54 @@
+name: UR - Build offload adapter
+
+permissions: read-all
+
+on: [ workflow_call, workflow_dispatch ]
+
+jobs:
+  offload_build:
+    name: Build
+    strategy:
+      fail-fast: false
+      matrix:
+        build_type: [Release]
+        compiler: [{c: gcc, cxx: g++}]
+
+    runs-on: [ "Linux", "build" ]
+    container:
+      image: 'ghcr.io/intel/llvm/ubuntu2404_base'
+
+    steps:
+    - name: Checkout LLVM
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+
+    - name: Install liboffload
+      run: sudo apt-get update -qq && sudo apt-get install --no-install-recommends -yqq liboffload-21 liboffload-21-dev
+
+    - name: Configure Unified Runtime project
+      # ">" is used to avoid adding "\" at the end of each line; this command is quite long
+      run: >
+        cmake
+        -S unified-runtime
+        -B $GITHUB_WORKSPACE/build
+        -DCMAKE_C_COMPILER=${{matrix.compiler.c}}
+        -DCMAKE_CXX_COMPILER=${{matrix.compiler.cxx}}
+        -DCMAKE_BUILD_TYPE=${{matrix.build_type}}
+        -DUR_ENABLE_TRACING=ON
+        -DUR_DEVELOPER_MODE=ON
+        -DUR_BUILD_TESTS=OFF
+        -DUR_BUILD_ADAPTER_OFFLOAD=ON
+        -DUR_OFFLOAD_INSTALL_DIR="/usr/lib/llvm-21"
+        -DUR_OFFLOAD_INCLUDE_DIR="/usr/lib/llvm-21/include"
+        -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/install
+
+    - name: Build
+      # This is so that device binaries can find the sycl runtime library
+      run: cmake --build $GITHUB_WORKSPACE/build -j $(nproc)
+
+    - name: Install
+      # This is to check that install command does not fail
+      run: cmake --install $GITHUB_WORKSPACE/build
+
+    - name: Get information about platform
+      if: ${{ always() }}
+      run: ./unified-runtime/.github/scripts/get_system_info.sh

.github/workflows/ur-precommit.yml

@@ -99,6 +99,12 @@ jobs:
       docker_image: ${{ matrix.docker_image || 'ghcr.io/intel/llvm/ubuntu2404_intel_drivers:alldeps'}}
       image_options: ${{ matrix.image_options || '' }}
 
+  offload_build:
+    name: Adapters (Offload)
+    needs: [detect_changes, source_checks]
+    if: ${{ always() && !cancelled() && contains(needs.detect_changes.outputs.filters, 'ur_offload_adapter') }}
+    uses: ./.github/workflows/ur-build-offload.yml
+
   macos:
     name: MacOS build only
     needs: [detect_changes, source_checks]