Re: Multilib directory of n32 libs

[David Daney <ddaney.cavm@gmail.com>]

On 05/28/2014 05:19 PM, David Kuehling wrote:
> > > > > > "David" == David Daney <ddaney.cavm@gmail.com> writes:
>
> > On 05/27/2014 06:58 PM, Yunqiang Su wrote:
> > > Sorry for dig it out again :-(
> > >
> > > If we put o32 multilib libraries in to /usr/lib directly, it will
> > > make lots of packages ftbfs, if they use -L/usr/lib.
> > >
> > > For this problem, we have another option that is:
> > >
> > > put ld.so.1 for o32 still in /lib while put other libraries to
> > > /usr/libo32 and /libo32.
>
> > As has been said many times before, there are already standard
> > locations established for libraries on MIPS systems.
>
> > 32-bit o32 ABI -> /lib, /usr/lib
> > 64-bit n32 ABI -> /lib32, /usr/lib32
> > 64-bit n64 ABI -> /lib64, /usr/lib64
>
> Are you sure that these "standard" locations apply to the mips64el
> debian port?

It question is an example of the logical fallacy of circular reasoning. 
  You are asking what a mips64{,el} Debian port should do based on what 
it might already would be doing.

Those library locations were established long ago by SGI.

Since there is no current mips64{,el} Debian port, and we are talking 
about how a new port should do things.  We have the two choices I outlined.

1) The old SGI way.
2) The new Debian way.

>  I think Yunqiang is talking about mips64el systems and not
> Debian mipsel in general.  Using /usr/lib only for the native mips64el
> libraries seems to be consistent with how things are handled on x86_64.

x86 is irrelevant.  Of much more importance is maintaining compatibility 
with the existing 32-bit MIPS Debian Distributions (all of which run 
well on 64-bit kernel/hardware)

> What would you suggest WRT the build failures that Yunqiang mentioned?
> Do we now need to file bugs against all packages that assume that one or
> another library resides in /usr/lib?  That might slow down the porting
> efforts a lot.
>
> > The new Debian way of doing things puts things in directories something like:
>
> > /lib/mips-linux-gnu
> > /lib/mips64-linux-gnuabi64
> > /lib/mips64-linux-gnuabin32
>
> This would at least keep o32 libraries out of /usr/lib.  Yunqiang, any
> problems with switching to these directories?
>
> David