Default gcc tuning?

[Zuxy Meng]

"Ian Lance Taylor" <iant@google.com> дÈëÏûÏ¢ÐÂÎÅ:m3slaqidqw.fsf@localhost.localdomain...
> "Zuxy Meng" <zuxy.meng@gmail.com> writes:
>
>> What will gcc do if I don't specify any -mtune? Will gcc optimize for 
>> some
>> default target or not do any scheduling at all?
>
> It will optimize for the default target.  The default target is the
> one for which it was configured.  You can see it by running gcc -v.

Thanks! But what if the 'default target' wasn't configured?
-- 
Zuxy