Prevent warnings treated as errors internally for level-zero thirdparty

Author: MirceaDan99

thirdparty/level_zero/CMakeLists.txt

@@ -10,24 +10,28 @@ set(BUILD_SHARED_LIBS OFF)
 set(CMAKE_DEBUG_POSTFIX "")
 
 # Skip warnings as errors for thirdparty
+set(ze_loader_sources_flags) # list, not string
+
 if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
-    ov_add_compiler_flags(/WX-)
+    set(ze_loader_sources_flags /WX-)
     # solve pdb access issue
     set(USE_Z7 ON)
     # Close spectre for ze loader
-    add_compile_options("/Qspectre-")
+    set(ze_loader_sources_flags ${ze_loader_sources_flags} /Qspectre-)
 elseif(CMAKE_COMPILER_IS_GNUCXX OR OV_COMPILER_IS_CLANG)
-    ov_add_compiler_flags(-Wno-error)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} \
-        -Wno-undef \
-        -Wno-missing-declarations")
+    set(ze_loader_sources_flags -Wno-error -Wno-undef -Wno-missing-declarations)
     if(UNUSED_BUT_SET_VARIABLE_SUPPORTED)
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-but-set-variable")
+        set(ze_loader_sources_flags ${ze_loader_sources_flags} -Wno-unused-but-set-variable)
     endif()
 endif()
 set(CMAKE_COMPILE_WARNING_AS_ERROR OFF)
 add_subdirectory(level-zero EXCLUDE_FROM_ALL)
 
+# Level-zero thirdparty treats warnings as errors internally, need to set compile options for its source files
+get_target_property(ze_loader_sources ze_loader SOURCES)
+list(FILTER ze_loader_sources INCLUDE REGEX ".*.cpp")
+set_source_files_properties(${ze_loader_sources} TARGET_DIRECTORY ze_loader PROPERTIES COMPILE_OPTIONS "${ze_loader_sources_flags}")
+
 set_property(TARGET ze_loader APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/level-zero/include>)
 
 # This VERSION file created by L0 may cause compilation issue of oneTBB headers, so remove it