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

[Mick <michaelkintzios@gmail.com>]

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On Friday 03 Apr 2015 19:09:23 covici@ccs.covici.com wrote:
> Mick <michaelkintzios@gmail.com> wrote:
> > On Friday 03 Apr 2015 17:48:38 covici@ccs.covici.com wrote:
> > > Grant Edwards <grant.b.edwards@gmail.com> wrote:
> > > > On 2015-04-03, Walter Dnes <waltdnes@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.
> 
> hmmm, one of the things dependent on emul-linux thingies is the C
> compiler! both 4.8.4 and 4.9, so if I unmerge the emul things, will I
> still have a C compiler?  Otherwise nvidia-drivers seems to also need
> emul-linux and they depend on each other.

I suspect some other 32bit binary package which uses Xorg, requires your 
nvidia-drivers to be a of a 32bit flavour.

Not so sure about the C compiler.  I seem to recall rebuilding gcc recently, 
but can't recall if this was as a result of unmerging all emul-linux.

-- 
Regards,
Mick

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