[PATCH 1/6] new observer command_option_changed.

[Yao Qi]

On Wednesday, July 25, 2012 08:31:55 AM Tom Tromey wrote:
> Yao> +        if (c->notify_observer_p)
> Yao> +          observer_notify_command_option_changed (c->name, arg);
> 
> Last night I realized that this does the wrong thing for multi-word
> parameters.  E.g., for "set print elements", the MI client will just see
> "elements".

Right, we are unable to get the previous command instance "print" in command 
instance  "elements".  So we have to move 
'observer_notify_command_option_changed' out of do_setshow_command to its 
caller, top.c:execute_command, where the full command option and value is 
available.  Then, we can change 'do_setshow_command' to return a boolean value 
indicating option is changed or not, and call 
observer_notify_command_option_changed if do_setshow_command returns true.

It works fine for me now.  I'll post a patch.

-- 
Yao (齐尧)