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

[Jorn Vernee]

On Wed, 14 Apr 2021 12:03:04 GMT, Maurizio Cimadamore <mcimadamore 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
>
> As discussed offline, might be helpful to print help from `printOptonError` anyway.

@mcimadamore The help message is quite noisy because it's so large, I'm also worried that the error message will get lost in the noise. It's easy enough to re-run jextract with -h or --help to get the help message, if that is really wanted, so I'd prefer to leave it like this.

Though, I wouldn't be opposed to adding something like:


Use -h or --help for help


WDYT?

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