[CI] Re-enable ABI-compatibility testing in pre-commit

Added UR_FORCE_FETCH_LEVEL_ZERO CMake option that forces Level Zero
loader fetching even if a preinstalled one is found on the platform.

Author: kswiecicki

.github/workflows/sycl-linux-precommit.yml

@@ -196,15 +196,15 @@ jobs:
             image: ghcr.io/intel/llvm/sycl_prebuilt_tests:sycl-rel-6_2
             target_devices: level_zero:gpu
             extra_lit_opts: '--param test-preview-mode=False --filter-out "${{ needs.compat_read_exclude.outputs.FILTER_6_2 }}"'
+            extra_cmake_args: -DUR_FORCE_FETCH_LEVEL_ZERO=ON
             binaries_artifact: 'in-container'
-            skip_run: true
           - name: ABI compatibility / sycl-rel-6_3
             runner: '["Linux", "pvc"]'
             image: ghcr.io/intel/llvm/sycl_prebuilt_tests:sycl-rel-6_3
             target_devices: level_zero:gpu
             extra_lit_opts: '--param test-preview-mode=False --filter-out "${{ needs.compat_read_exclude.outputs.FILTER_6_3 }}"'
+            extra_cmake_args: -DUR_FORCE_FETCH_LEVEL_ZERO=ON
             binaries_artifact: 'in-container'
-            skip_run: true
 
     uses: ./.github/workflows/sycl-linux-run-tests.yml
     with:

unified-runtime/CMakeLists.txt

@@ -56,6 +56,7 @@ option(UR_BUILD_XPTI_LIBS "Build the XPTI libraries when tracing is enabled" ON)
 option(UR_STATIC_LOADER "Build loader as a static library" OFF)
 option(UR_FORCE_LIBSTDCXX "Force use of libstdc++ in a build using libc++ on Linux" OFF)
 option(UR_ENABLE_LATENCY_HISTOGRAM "Enable latncy histogram" OFF)
+option(UR_FORCE_FETCH_LEVEL_ZERO "Force fetching Level Zero even if preinstalled loader is found" OFF)
 set(UR_EXTERNAL_DEPENDENCIES "" CACHE STRING
     "List of external CMake targets for executables/libraries to depend on")
 set(UR_DPCXX "" CACHE FILEPATH "Path of the DPC++ compiler executable")

unified-runtime/cmake/FetchLevelZero.cmake

@@ -32,7 +32,7 @@ else()
   endif()
 endif()
 
-if(NOT LEVEL_ZERO_LIB_NAME AND NOT LEVEL_ZERO_LIBRARY)
+if((NOT LEVEL_ZERO_LIB_NAME AND NOT LEVEL_ZERO_LIBRARY) OR UR_FORCE_FETCH_LEVEL_ZERO)
   message(STATUS "Level Zero Adapter: Download Level Zero loader and headers from github.com")
 
   # Workaround warnings/errors for Level Zero build