Gentoo Archives: gentoo-dev

From: Chris Gianelloni <wolf31o2@g.o>
To: gentoo-dev@l.g.o
Subject: [gentoo-dev] Proper way to determine whether a profile is multilib?
Date: Thu, 20 Sep 2007 22:12:59
1 OK. I'm looking at bug #173962[1] and bug #187683[2] currently and
2 encountering a problem which I thought I would bring to the group to try
3 to resolve. Both ATI and NVIDIA binary video drivers supply both 64-bit
4 and 32-bit libraries. Now, our default profiles are multilib for amd64,
5 but there is also a no-multilib sub-profile. The problem is that we
6 need to install app-emulation/emul-linux-x86-xlibs on a multilib
7 profile, but cannot install it on a no-multilib profile. The ebuilds
8 currently use USE=multilib, which has been deprecated for a while and is
9 masked on amd64, to determine whether to install this package. Of
10 course, this doesn't work out. I'm pretty sure we cannot do any
11 multilib profile checks prior to *DEPEND because they'll be done in the
12 global scope and will affect cache generation, as the check will get the
13 profile from the server doing cache generation.
15 Now, on to the question...
17 How do we *DEPEND on something that is only necessary for a multilib
18 profile without USE=multilib and without invalidating the cache?
20 My two "solutions" (neither of which are good) are as follows:
22 - Re-enable USE=multilib in the multilib profiles, and force it on in
23 the proper profiles while masking it in the others... this might be
24 feasible simply because we *can* force-enable USE flags in a profile
25 now, which we couldn't do back when this was deprecated
26 - Re-create app-emulation/emul-linux-x86-nvidia with the 32-bit parts of
27 nvidia-drivers in it and have 32-bit apps *DEPEND on this package on the
28 affected architectures... this is also a bit less ugly than it used to
29 be because NVIDIA is now shipping all of the required libraries so all
30 we would need to do is make the versions match
32 Can someone else come up with another idea, preferably a much better
33 one?
35 [1]
36 [2]
38 --
39 Chris Gianelloni
40 Release Engineering Strategic Lead
41 Alpha/AMD64/x86 Architecture Teams
42 Games Developer/Council Member/Foundation Trustee
43 Gentoo Foundation


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