Re: [gentoo-user] Two gcc versions installed

[Alex Schuster <wonko@wonkology.org>]

Daniel D Jones writes:

> eix gcc shows:
> 
>  Installed versions:
> 
> 4.3.4(4.3)!s(10:56:18 AM 02/27/2010)(gtk mudflap nls nptl openmp
> -altivec - bootstrap -build -doc -fixed-point -fortran -gcj -hardened
> -libffi -multilib - multislot -n32 -n64 -nocxx -nopie -objc -objc++
> -objc-gc -test -vanilla)
> 
> 4.4.3-r2(4.4)!s(08:29:19 PM 06/07/2010)(fortran gtk mudflap nls nptl
> openmp - altivec -bootstrap -build -doc -fixed-point -gcj -graphite
> -hardened -libffi - multilib -multislot -n32 -n64 -nocxx -objc -objc++
> -objc-gc -test -vanilla)
> 
> Is there any reason to have both of these installed?  Is it safe to
> unmerge 4.3.4?

Probably not. I would do an emerge -a --depclean. If nothing depends on 
the old gcc, it will be removed. Otherwise you get a message what has to 
be rebuilt, like I do:

weird ~ # emerge -a --depclean

 * Always study the list of packages to be cleaned for any obvious
 * mistakes. Packages that are part of the world set will always
 * be kept.  They can be manually added to this set with
 * `emerge --noreplace <atom>`.  Packages that are listed in
 * package.provided (see portage(5)) will be removed by
 * depclean, even if they are part of the world set.
 * 
 * As a safety measure, depclean will not remove any packages
 * unless *all* required dependencies have been resolved.  As a
 * consequence, it is often necessary to run `emerge --update
 * --newuse --deep @world` prior to depclean.

Calculating dependencies... done!
>>> Checking for lib consumers...
>>> Assigning files to packages...
 * In order to avoid breakage of link level dependencies, one or more
 * packages will not be removed. This can be solved by rebuilding the
 * packages that pulled them in.
 * 
 *   sys-devel/gcc-4.3.4 pulled in by:
 *     app-arch/rpm-4.4.6-r7 needs libgomp.so.1
 *     dev-lang/R-2.11.1 needs libgfortran.so.3
 *     dev-lang/gdl-0.9_rc4 needs libgomp.so.1
 *     dev-libs/beecrypt-4.2.1 needs libgomp.so.1
 *     kde-base/cantor-4.4.4 needs libgfortran.so.3
 *     kde-base/libkdcraw-4.4.4 needs libgomp.so.1
 *     media-gfx/imagemagick-6.6.1.7 needs libgomp.so.1
 *     media-sound/sox-14.3.1 needs libgomp.so.1
 *     media-video/transcode-1.1.5-r1 needs libgomp.so.1
 *     sci-libs/blas-reference-20070226-r1 needs libgfortran.so.3
 *     sci-libs/fftw-3.2.2 needs libgomp.so.1
 *     sci-libs/plplot-5.9.5 needs libgfortran.so.3
 *     sys-devel/gettext-0.18.1 needs libgomp.so.1
 * 
>>> Adding lib providers to graph...                                                                       
-
Calculating dependencies... done!
>>> No packages selected for removal by depclean
>>> To see reverse dependencies, use --verbose
Packages installed:   1678
Packages in world:    373
Packages in system:   50
Required packages:    1678
Number removed:       0

	Wonko