Re: [gentoo-dev] Re: Gentoo Prefix: on EPREFIX, ED and EROOT inside ebuilds

[Fabian Groffen <grobian@gentoo.org>]

On 26-11-2009 10:37:10 +0000, Duncan wrote:
> Fabian Groffen posted on Thu, 26 Nov 2009 11:10:09 +0100 as excerpted:
> 
> > Gentoo Prefix tries to be as much self-sufficient as possible, and hence
> > applications *must* not reference the host system, unless absolutely
> > necessary, such as for e.g. /lib/libc.so.
> 
> Thanks.  Host libc /does/ make sense as "absolutely necessary.
> 
> Are there any less obvious ones, say of the type that might reach out and 

Some that you may find are:
/lib/libm.so
/lib/libsocket.so
/lib/libpthread.so
/lib/libnsl.so

On a side note, we have a question about this in our
prefix-ebuild-quiz[1] (question 5 from the second section).

> grab an unsuspecting dev trying to make his ebuilds prefix compliant?  It 
> seems to me that enumerating all (or all non-corner) cases where 
> referencing the host is desired/mandatory, with a blanket rule saying 
> reference prefix unless it's a known exception, should be by /far/ the 
> easiest alternative, here.

I think there's unfortunately no simple way to tell what should be in
and what unfortunately has to be out.  It depends a lot on the host
system.  I feel -- but I can't back this up with hard evidence -- that
it are usually the libs that are not in *DEPEND that can only be
available in the host system.  Basically because they usually are part
of the libc, which we assume to be installed.


[1] http://dev.gentoo.org/~grobian/prefix-quiz

-- 
Fabian Groffen
Gentoo on a different level