7.5.5 Option Attributes
For each option you wish to specify, you must have a block macro named
flag defined. There are two required attributes:
descrip. If any options do not have a
value (traditional flag
character) attribute, then the
long-opts program attribute must also
be defined. As a special exception, if no options have a
long-opts is not defined and
not defined, then all arguments to the program are named options. In this
case, the ‘-’ and ‘--’ command line option markers are optional.
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