7.5.8 ERRSTOP_OPTERR - Stop on Errors

After invoking this macro, if optionProcess() encounters an error, it will call exit(1) rather than return. This is the default processing mode. It can be overridden by specifying allow-errors in the definitions file, or invoking the macro See section 7.5.7 ERRSKIP_OPTERR - Ignore Option Errors.