Gentoo Archives: gentoo-user

From: Fernando Rodriguez <frodriguez.developer@×××××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Endless preserved-rebuild loop, libmozalloc & more
Date: Tue, 25 Aug 2015 02:49:35
Message-Id: BLU436-SMTP16748958EFD3E94F274DE668D610@phx.gbl
In Reply to: Re: [gentoo-user] Endless preserved-rebuild loop, libmozalloc & more by Fernando Rodriguez
1 On Monday, August 24, 2015 10:28:36 PM Fernando Rodriguez wrote:
2 > On Monday, August 24, 2015 9:31:38 PM Alan McKinnon wrote:
3 > > Does anyone have an opinion to offer on bug 501468?
4 > >
5 > > https://bugs.gentoo.org/show_bug.cgi?id=501468
6 > >
7 > > It's been annoying me for a week now with this message:
8 > >
9 > > !!! existing preserved libs:
10 > > >>> package: www-client/firefox-40.0.2
11 > > * - /usr/lib64/firefox/libmozalloc.so
12 > > * used by /usr/lib64/thunderbird/components/libdbusservice.so
13 > > (mail-client/thunderbird-38.2.0)
14 > > * used by /usr/lib64/thunderbird/components/libmozgnome.so
15 > > (mail-client/thunderbird-38.2.0)
16 > > * used by
17 > > /usr/lib64/thunderbird/distribution/extensions/{e2fda1a4-762b-4020-b5ad-
18 > a41df1933103}/components/libcalbasecomps.so
19 > > (mail-client/thunderbird-38.2.0)
20 > > * used by 4 other files
21 > >
22 > >
23 > > Both Mozilla products ship this file:
24 > >
25 > > $ locate libmozalloc
26 > > /usr/lib64/firefox/libmozalloc.so
27 > > /usr/lib64/thunderbird/libmozalloc.so
28 > >
29 > > and according to preserved libs, thunderbird linked to the firefox copy.
30 > > The only offered solution on the bug is to use a MASK variable, which
31 > > seems to me an ugly hammer to swat a fly.
32 > >
33 > > I was wondering if there's a better way been developed in the last year.
34 >
35 > Actually, now I have a general idea of what's going on and that sounds like
36 an
37 > acceptable solution but perhaps I could be better. This is what happens:
38 >
39 > 1. revdep-rebuild uses ldd to find breakage. It finds breakage in
40 > libdbusservice.so because firefox uses tricks to preload the library from
41 it's
42 > directory.
43 > 2. revdep-rebuild find that thunderbird provides the library and thinks it
44 > needs to be rebuild. (And wrongly tells you that firefox links against it).
45 >
46 > A better way would be:
47 >
48 > 1. same as step 1 above
49 > 2. revdep-rebuild checks the package that provides the broken binary (in
50 this
51 > case the firefox package), if this package also provides the missing library
52 > then it's safe to ignore the problem.
53 > 3. same as step 2 above.
54 >
55 > Another solution is to make patch firefox to use RPATH so ldd can find the
56 > labraries, this would also make prelink work better with firefox but it's
57 > probably not ideal to mantain.
58
59 Actually it's sort of the other way around in this case...it found breakage in
60 thunderbird files, but everything still applies.
61 --
62 Fernando Rodriguez