Re: [gentoo-user] Re: multilib - do I need it?

[Mick]

On Friday 03 Apr 2015 17:48:38 covici@××××××××××.com wrote:
> Grant Edwards <grant.b.edwards@×××××.com> wrote:
> > On 2015-04-03, Walter Dnes <waltdnes@××××××××.org> wrote:
> > > On Thu, Apr 02, 2015 at 02:12:40PM -0300, Francisco Ares wrote
> > >
> > >> Hi,
> > >>
> > >> How does one know previously which packages will require 32 bit ABI ?
> > >>
> > >> I have two systems (among others) to consider: one is very simple,
> > >> built using as fewer packages as possible, it is the development
> > >> system for an embedded equipment, and it is 64 bit ABI only - no
> > >> multilib;  the other is a general purpose workstation, with lots of
> > >> packages, and someday, by some forgotten reason, I needed to install
> > >> emul-linux-* .
> > >>
> > >   Can you attach your /var/lib/portage/world file to a post here?  I
> > >
> > > assume you have nothing embarressing in it.  Almost all applications
> > > that used to require 32-bit emulation now run natively on 64-bit
> > > no-multilib.  I recently upgraded a 7+ year old machine from 32-bit
> > > Gentoo to 64-bit-only Gentoo (no-multilib) and I don't have any apps
> > > with problems as 64-bit only.
> >
> > The only two 32-bit apps I've run into on my various XFCE machines are
> > grub-legacy (which requires a 32-bit ncurses lib), and acroread (which
> > requires 100+ 32-bit libraries).
>
> hmmm, I have 7 emul-linux86 packages, but portage did not offer to
> replace them when I checked today for a world update -- I didn't want to
> remove them manually, I thought it might do more harm than good.  I am
> not sure whether I need any 32-bit libraries, although I do have
> multilib enabled, but I wonder about those emul-linux-x86 packages.  Any
> way for me to tell what is going on here such as dependencies on 32-bit
> libraries?

Try this perhaps:

for EMUL in $(eix -I --only-names emul-linux); do equery depends $EMUL; done

unmerge them and the run 'emerge @preserved-rebuild'.  Portage will then tell 
you which 32bit packages you will need to add in your package.use file with 
the 32 bit ABI flag.

-- 
Regards,
Mick