libstdc++/1605: exception::what() declares no exception list

[Benjamin Kosnik]

Thanks for pointing this out.

Why stop with what()? Let's add all of the throw specs. 

I've done some of this, but ran into a bit of trouble. I'll keep you posted:

http://gcc.gnu.org/ml/gcc-bugs/2001-01/msg00297.html

thanks,
benjamin