Gentoo Archives: gentoo-dev

From: Marius Mauch <genone@g.o>
To: gentoo-dev@l.g.o
Subject: Re: [gentoo-dev] Re: RFC: Should preserve-libs be enabled by default?
Date: Fri, 30 May 2008 05:25:18
In Reply to: [gentoo-dev] Re: RFC: Should preserve-libs be enabled by default? by (Diego 'Flameeyes' =?utf-8?Q?Petten=C3=B2?=)
1 On Thu, 29 May 2008 11:02:55 +0200
2 flameeyes@×××××.com (Diego 'Flameeyes' Pettenò) wrote:
4 > Marius Mauch <genone@g.o> writes:
5 >
6 > As much as we want preserve-libs to be an all-curing magic, it's
7 > not. When you need to replace a library you need to do so _for all its
8 > users at once_, if you allow it to be gradually you're opening the
9 > hellgate of symbol collision.
11 That's what `emerge @preserved-rebuild` does, or do you mean something
12 different?
14 > My solution would be to disallow _building_ anything that is or
15 > depends directly or indirectly on a package on the set until it is
16 > removed, or at the request of merging "mickeymouse", depending on
17 > "bar", re-emerging libfoo first, and bar if the user is not using
18 > --as-needed (checking the NEEDED lines).
20 Well, with preserve-libs the situation is this (using your example):
21 - user upgrades expat, portage keeps around
22 (some packages might now be linked against both versions if the session
23 included other packages as well)
24 - emerge tells the user to rebuild all affected packages (affected =
25 contains in NEEDED, so includes both libfoo and bar) by
26 using `emerge @preserved-rebuild` (in the future this could also be done
27 automatically, but that won't be before 2.2 final)
28 - when all affected packages have been rebuilt (so their NEEDED entries
29 don't contain anymore) is automatically
30 removed
32 So, if I understand you correctly (probably not), you want portage to
33 prevent the user from building any packages depending on any affected
34 package before the last step is completed?
36 > With all due respect to everybody, the right course of action here has
37 > to be selected by people who knows how the runtime linker works,
38 > symbol collision and all the rest, as that's what's at stake here.
40 Whoever that is is welcome to voice his opinion here, that's the point
41 of this thread after all.
43 Marius
44 --
45 gentoo-dev@l.g.o mailing list


Subject Author
Re: [gentoo-dev] Re: RFC: Should preserve-libs be enabled by default? Peter Volkov <pva@g.o>
[gentoo-dev] Re: RFC: Should preserve-libs be enabled by default? (Diego 'Flameeyes' =?utf-8?Q?Petten=C3=B2?=)