(gettext.info)AM_XGETTEXT_OPTION

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13.5.6 AM_XGETTEXT_OPTION in ‘po.m4’
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   The ‘AM_XGETTEXT_OPTION’ macro registers a command-line option to be
used in the invocations of ‘xgettext’ in the ‘po/’ directories of the
package.

   For example, if you have a source file that defines a function
‘error_at_line’ whose fifth argument is a format string, you can use
     AM_XGETTEXT_OPTION([--flag=error_at_line:5:c-format])
to instruct ‘xgettext’ to mark all translatable strings in ‘gettext’
invocations that occur as fifth argument to this function as ‘c-format’.

   See Note: xgettext Invocation for the list of options that
‘xgettext’ accepts.

   The use of this macro is an alternative to the use of the
‘XGETTEXT_OPTIONS’ variable in ‘po/Makevars’.