once we have cpplib...

[Joe Buck]

> > Persnally, I don't see this as having much importance.  Do we we really
> > support the -V option?  Cygnus has always recommended against its use.
> 
> I think it is essential.  I have many old compilers lying around since
> I build and install egcs frequently.  If a version is broken I must be
> easy to use an old version.

Unfortunately -V switches compilers but doesn't switch libstdc++, so
in practice I've had to use distinct --prefix values to keep multiple
compilers around.