[libs][External] set yaml-cpp to system lib

Author: amin1377

libs/EXTERNAL/CMakeLists.txt

@@ -13,8 +13,14 @@ add_subdirectory(libblifparse)
 add_subdirectory(libtatum)
 add_subdirectory(libcatch2)
 
-set_directory_properties(PROPERTIES COMPILE_OPTIONS "-Wno-switch-default")
 add_subdirectory(yaml-cpp)
+# Treat yaml-cpp headers as system headers to suppress warnings
+if(TARGET yaml-cpp)
+    get_target_property(YAML_INCLUDE_DIRS yaml-cpp INTERFACE_INCLUDE_DIRECTORIES)
+    set_target_properties(yaml-cpp PROPERTIES
+        INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "${YAML_INCLUDE_DIRS}"
+    )
+endif()
 
 #add_subdirectory(parmys)