cleanup: compile with -fno-operator-names in maintainer mode

Author: vuvova

cmake/maintainer.cmake

@@ -43,7 +43,7 @@ FOREACH(F ${MY_WARNING_FLAGS})
  MY_CHECK_AND_SET_COMPILER_FLAG(${F} DEBUG RELWITHDEBINFO)
 ENDFOREACH()
 
-SET(MY_ERROR_FLAGS -Werror)
+SET(MY_ERROR_FLAGS -Werror -fno-operator-names)
 
 IF(CMAKE_COMPILER_IS_GNUCC AND CMAKE_C_COMPILER_VERSION VERSION_LESS "6.0.0")
  SET(MY_ERROR_FLAGS ${MY_ERROR_FLAGS} -Wno-error=maybe-uninitialized)