libstdc++v3 as a drop-in replacement to libstdc++v2

[llewelly@198.dsl.xmission.com]

On Mon, 7 Feb 2000, Benjamin Kosnik wrote:

> 
> Subject pretty much says it all. I want to make v3 something that can
> be "dropped" or copied or whatever into the base directory of an egcs
> release, replacing the current libstdc++ implementation.
> 
> Doing this simplifies many xcompile issues.
> 
> Doing this means the libio subdir can get ripped out, and the libio
> subdir that is part of egcs can be used instead.
> 
> Doing this kills the build trees of current CVS users, as they'll have to
> put sources into an egcs hierarchy to get libio includes.
> 
> Doing this will mean that install documentation will have to get tweaked.
> 
> 
> I think this is something that will have to be done eventually anyway,
> and sooner is better than later.
> 
> If there are no serious objections I'll check this in tonight or early
> tomorrow morning.
> 

Assuming that installing libstdc++-v3 as a separate lib (so the system
  has 2 different libstdc++s) is retained, I think this is a great idea.

[snip]