On Tue, Nov 15, 2011 at 13:58, Jarry <mr.ja...@gmail.com> wrote: > Hi, > today I upgraded gcc from 4.4.5 to the last stable version > 4.5.3-r1. I followed "Gentoo GCC Upgrade Guide": > > # emerge -uav gcc > # gcc-config 2 > # env-update && source /etc/profile > # emerge --oneshot libtool > > # emerge --depclean > # revdep-rebuild > > 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? >
Because your forgot the -1 / --oneshot flag when manually upgrading gcc. However, in system, multiple gcc slots do not exist, so if you need gcc:4.4 for backwards compatibility or gcc:4.6 for forwards compatibility, it'll show up in your world file.
