Disable CFI checks when ASAN is specified

This causes linker errors, and presumably isn't meaningful anyway.

Closes: #2323

Author: RossBrunton

.github/workflows/build-fuzz-reusable.yml

@@ -47,8 +47,6 @@ jobs:
         cmake --build build -j $(nproc)
 
     - name: Configure CMake
-      # CFI sanitization (or flto?) seems to cause linking to fail
-      # https://github.com/oneapi-src/unified-runtime/issues/2323
       run: >
         cmake
         -B${{github.workspace}}/build
@@ -60,7 +58,6 @@ jobs:
         -DUR_USE_ASAN=ON
         -DUR_USE_UBSAN=ON
         -DUR_BUILD_ADAPTER_L0=ON
-        -DUR_USE_CFI=OFF
         -DUR_LEVEL_ZERO_LOADER_LIBRARY=${{github.workspace}}/level-zero/build/lib/libze_loader.so
         -DUR_LEVEL_ZERO_INCLUDE_DIR=${{github.workspace}}/level-zero/include/
         -DUR_DPCXX=${{github.workspace}}/dpcpp_compiler/bin/clang++

cmake/helpers.cmake

@@ -63,6 +63,12 @@ if(CMAKE_SYSTEM_NAME STREQUAL Linux)
     check_cxx_compiler_flag("-fstack-clash-protection" CXX_HAS_FSTACK_CLASH_PROTECTION)
 endif()
 
+if (UR_USE_CFI AND UR_USE_ASAN)
+    message(WARNING "Both UR_USE_CFI and UR_USE_ASAN are ON. "
+        "Due to build errors, this is unsupported; CFI checks will be disabled")
+    set(UR_USE_CFI OFF)
+endif()
+
 if (UR_USE_CFI)
     set(SAVED_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
     set(CMAKE_REQUIRED_FLAGS "-flto -fvisibility=hidden")