RFC --enable-debugging

[B. Kosnik]

>Perhaps there is a need for a new option that explicitly says "look
>for debugging libraries" that is independent from the selection of
>debugging symbols?  This is what I would really prefer, I think.
>Perhaps -glib?  Or -gc++?

A ha! Something like threads and -pthread, only for debugging. Say, -debug. 

Man, this is a cool idea. I like this approach very much, and I think it
resolves this issue nicely.

It's of more general use than just libstdc++. Once we figure out what we
want to do for libstdc++ perhaps we could do an RFC on the gcc list to
see what other people think, and if it would be useful to other
libraries as well.

-benjamin