Re: Patch: Add Option Groups

[Andrew Cagney <cagney@redhat.com>]

Tom Tromey wrote:
>>>>>> "Andrew" == Andrew Cagney <cagney@redhat.com> writes:
>>>>>>             
>
> Andrew> Good point; there's also a getopt "feature" we need to avoid, things
> Andrew> need to be created using the sequence:
>
> Andrew>   - create group
> Andrew>   - add group members
> Andrew>   - add group to parser
>
> Andrew> otherwise, while they show up in the help message, they don't work.
> Andrew> Quick read of Parser.add(OptionGroup) shows why.
>
> Could you spell it out?
> If there is a bug, I will fix it.
>   

Contrast it with the sequence:

   - create group
  - add group members (these are in help and work)
  - add group to parser
  - add group members (these are in help, yet don't work)

parser.add(group)'s implementation just iterates over the options in the 
group registered at that point (adding them to the lower-level option 
parser);  this means options added to the group after the call, while 
members of the group, are not registered known to lower-level parser 
code.  This leads to:

- -help listing the options (it's iterating over group members)
yet
- the options not appearing to work

I'm not sure if its an interface restriction, or a bug; either way it 
leads to a confusing client problem.

Andrew

> Tom
>