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The formatting of the usage message can be controlled with the use of the
AUTOOPTS_USAGE environment variable. If it contains any of five
possible comma separated values, it will affect ‘libopts’ behavior.
Any extraneous or conflicting data will cause its value to be ignored.
If the program attributes
short-usage have been
specified (see section Usage and Version Info Display), these
strings are used for displaying full usage and abbreviated usage.
“Full usage” is used when usage is requested, “abbreviated usage”
when a usage error is detected. If these strings are not provided,
the usage text is computed.
AUTOOPTS_USAGE environment variable may be set to the comma and/or
white space separated list of the following strings:
Ignore the provision of
and compute the usage strings. This is useful, for example, if you wish to
regenerate the basic form of these strings and either tweak them or translate
them. The methods used to compute the usage text are not suitable for
The format of the usage text will be displayed in GNU-normal form. The default display for ‘--version’ will be to include a note on licensing terms.
The format of the extended usage will be in AutoOpts’ native layout. The
default version display will be one line of text with the last token the
autoopts conflict and may not be used
When an option error is made on the command line, the abbreviated usage text will be suppressed. An error message and the method for getting full usage information will be displayed.
When an option error is made on the command line, the abbreviated usage text
will be shown.
no-misuse-usage conflict and
may not be used together.
autoopts are the defaults.
These defaults may be flipped to
program attributes, respectively, in the option definition file.
Note for developers:
The templates used to implement AutoOpts depend heavily upon token pasting.
That mens that if you name an option,
debug, for example, the generated
header will expect to be able to emit
#define macros such as this:
#define DESC(n) (autogenOptions.pOptDesc[INDEX_OPT_## n])
DESC(DEBUG) to expand correctly into
#defined to something else, then
that something else will be in the above expansion.
If you discover you are having strange problems like this,
you may wish to use some variation of the
See section Program Description Attributes.
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