[foreign-jextract] RFR: 8265211: Print specific error message when an option parsing error occurs [v2]

[Maurizio Cimadamore]

On Tue, 20 Apr 2021 11:36:37 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

>> Hi,
>> 
>> This patch makes jextract print a more specific error message when an option parsing error occurs, where currently only the help message is printed.
>> 
>> For instance, when using an unrecognized option `-o` it will print
>> 
>> 
>> OPTION ERROR: o is not a recognized option
>> 
>> 
>> Or when specifying multiple header files
>> 
>> 
>> OPTION ERROR: Expected 1 header file, not 3
>> 
>> 
>> Thanks,
>> Jorn
>
> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Print usage and --help hint on option error as well.

Looks good!

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Marked as reviewed by mcimadamore (Committer).

PR: https://git.openjdk.java.net/panama-foreign/pull/500