Rename -W to -Wextra ?

[Joe Buck]

>  > Well, I think it mostly depends on whether you see any utility in
>  > recovering -W to mean what -Wall currently means.  If that's the long
>  > term goal, -W needs to be deprecated and then removed entirely for a
>  > release or two, IMO, before it changes functionality.

Kaveh writes:
> I think changing -W to mean something different is an even worse idea
> than eliminating it. :-(

I don't think that eliminating -W is an option at all.  We're stuck with
it.  We could add -Wextra as a synonym, but that's about it.  It's too
commonly used and has been in gcc for over a decade.