[Bug default/19606] New: Need better error message for invalid options

["michi.henning at canonical dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19606

            Bug ID: 19606
           Summary: Need better error message for invalid options
           Product: libabigail
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: michi.henning at canonical dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

$ abidiff --changed-funcions dump1 dump2
unrecognized option
try the --help option for more information


There is a typo in the option name.

It would be nice if abidiff (and other tools) were to show the offending
option. If there are several, it's tedious to have to figure out which one has
the typo. That's especially true if the options aren't visible directly, such
as when a script is used to cobble together the command line.

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