CheckStringOptionValue.cmake raw

   1  function(check_string_option_value option)
   2    get_property(expected_values CACHE ${option} PROPERTY STRINGS)
   3    if(expected_values)
   4      if(${option} IN_LIST expected_values)
   5        return()
   6      endif()
   7      message(FATAL_ERROR "${option} value is \"${${option}}\", but must be one of ${expected_values}.")
   8    endif()
   9    message(AUTHOR_WARNING "The STRINGS property must be set before invoking `check_string_option_value' function.")
  10  endfunction()
  11