execute_process(COMMAND ${CMAKE_COMMAND} -E true
  COMMAND ${CMAKE_COMMAND} -E false
  COMMAND ${CMAKE_COMMAND} -E false
  COMMAND ${CMAKE_COMMAND} -E true
  RESULT_VARIABLE result
  )

set(CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL LAST)
if(result EQUAL "0")
  execute_process(COMMAND ${CMAKE_COMMAND} -E true
    COMMAND ${CMAKE_COMMAND} -E false
    COMMAND ${CMAKE_COMMAND} -E false
    COMMAND ${CMAKE_COMMAND} -E true
    )
endif()