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From: Nikos Chantziaras <realnc@arcor.de>
Subject: [gentoo-user] Re: Upgrading gcc: both 4.4 and 4.5 needed?
Date: Wed, 16 Nov 2011 02:54:47 +0200
Organization: Lucas Barks
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On 11/15/2011 08:58 PM, Jarry wrote:
> Hi,
> today I upgraded gcc from 4.4.5 to the last stable version
> 4.5.3-r1.
>[...]
> But at the and I noticed gcc 4.4 has not been unmerged
> and my "world" file is somehow larger. To my surprise,
> it contains these lines:
>
> sys-devel/gcc
> sys-devel/gcc:4.4
>
> I did full backup before, so I compared world-file before
> and after gcc-upgrade just to find out, these two lines
> have been really inserted now, during gcc-upgrade. And my
> question is: what does it mean? Does my system need now
> both gcc 4.4 and 4.5? Why is actually gcc in world-file,
> when it is part of system?

The old GCC version does not get removed.  This is a good thing just in 
case the new one doesn't work for some reason.

If it works OK, you can manually unmerge the old version:

   emerge -aC gcc:4.4

Before doing that, however, make sure the new one has been activated 
with gcc-config and verify that it works by building some random package.