Call for --as-needed testing

jmbsvicetto · Posted: Sun Nov 16, 2008 5:48 pm Post subject: Call for --as-needed testing

For quite sometime, there has been an on-going discussion about --as-needed in the Gentoo community, with several threads in the gentoo dev ml, that finally lead to a discussion by the Gentoo Council and to the as-needed by default bug. You can read more about --as-needed and how to fix packages that fail to build with it in the --as-needed introduction and fixing guide written by flameeyes.

Diego has been building the whole tree with --as-needed and already found out a few issues and has a plan on how to deal with those issues. He's now asking for members of the community to help rapidly increase the scope of the test effort. If you want to help, follow the instructions in his blog entry and open up a new bug in Bugzilla blocking the --as-needed tracker bug. Be warned, that you should only run these tests if you understand what you're doing and if anything breaks it's up to you to pick up the pieces. Use this thread for discussion about the testing.

We strongly suggest you use a testing system or a chroot to do this testing and be warned that python/ruby/perl/whatever-non-c-bindings might fail at runtime since they are not tested at build-time. As Diego isn't testing any overlays, it would be very useful if you could test the overlays you use.
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widremann · Veteran Joined: 14 Mar 2005 Posts: 1314

I've been running my laptop system with --as-needed for a while now and I haven't had anything break, at least not in any way that's obvious.

ppurka · Advocate Joined: 26 Dec 2004 Posts: 3049

I am using --as-needed too for about 6 months. All packages compile and run properly. (Except alpine which I have in my local overlay).
My package list includes parts of kde, rox, enlightenment (from overlay), firefox, stable xorg, glibc-2.8, gcc-4.3.1
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Letharion · Veteran Joined: 13 Jun 2005 Posts: 1216 Location: Sweden

I used the --as-needed gcc-profile and did

seqizz · Posted: Tue Feb 03, 2009 8:49 am Post subject: :\

Same here, --as-needed with ~x86, no break at all. Gnome desktop system.
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balkira · Posted: Mon Feb 09, 2009 1:29 am Post subject:

--as-needed works ok for me. Full Xfce4 desktop running.

DigitalCorpus · Apprentice Joined: 30 Jul 2007 Posts: 245

All but one package on my ~amd64 system compiles with --as-needed

toralf · Posted: Wed Feb 18, 2009 4:23 pm Post subject:

Works fine for an user mode linux image (stable x86, courier, cups, apache2, mysql).

LoSeR_5150 · Posted: Tue Feb 24, 2009 9:41 pm Post subject:

So far working without any noticeable problems on both my machines
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CapnBuzzkill · n00b Joined: 16 Mar 2007 Posts: 23 Location: Holland

I noticed today that app-text/sablotron-1.0.1 (x86) fails to emerge with --as-needed (it does emerge succesfully without it). After searching Bugzilla, I found this bug, which has a patch for version 1.0.3. I confirmed that app-text/sablotron-1.0.3 (~x86) does emerge with --as-needed, but I do wonder why version 1.0.1 is still the latest stable version when the patch for version 1.0.3 has been committed almost two years ago. (I didn't see any other bugs in Bugzilla that I think would prevent the stabilization of app-text/sablotron-1.0.3, but I could be wrong ofcourse). I can understand that "--as-needed"-bugs don't get the highest priority, but two years seems like a very long time, doesn't it?

dreadlorde · Posted: Fri Feb 27, 2009 2:00 am Post subject:

I've been using --as-needed for about a month now and haven't noticed any bugs from it so far.

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mack1 · Guru Joined: 18 Mar 2006 Posts: 313

Same here

!!!
I am using "--as-needed" on pentium4,core2 and k10 (AMD64) and it works fine.

My LDFLAGS:

natros · n00b Joined: 26 Sep 2003 Posts: 70

No problems here either

Is there any advantage using --hash-style=gnu ?
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skutnar · n00b Joined: 13 Jun 2006 Posts: 65

I've been running with system and world completely re-emerged using the gcc spec file --as-needed set up described by Flameeyes. I had no compilation problems (I'd already prepped device-mapper via http://bugs.gentoo.org/show_bug.cgi?id=259569) and no noticeable runtime issues.

As for --hash-style=gnu, the following is a little old, but may offer some background: http://bugs.gentoo.org/show_bug.cgi?id=259569

natros · n00b Joined: 26 Sep 2003 Posts: 70

skutnar · n00b Joined: 13 Jun 2006 Posts: 65

Whoops! Sorry, I guess copy/paste didn't work right. Here's the page I meant: http://www.gentoo-wiki.info/HOWTO_Hashstyle

As I said, this is a little on the old side, but can be useful for some history.

iBormuth · n00b Joined: 13 Jan 2004 Posts: 59

Wow, that sounds like a positive response all over the place. Same here. I'm using --as-needed since months without any problem so far. At least none that I knew of ;). It's a x86 stable system with ~1300 packages installed, ~200 lines in packages.keywords :P and gcc-4.3.3.

justinkb · Apprentice Joined: 23 Dec 2008 Posts: 160

works fine here. ~amd64 system, gcc 4.4.0svn with graphite flags enabled... solid as a rock on two machines.

Uzytkownik · Guru Joined: 31 Oct 2004 Posts: 387 Location: London, UK

Works on ~x86+gnome-overlay+a few others but I have to admit the system was built originally with --add-needed in pararell. But no problems (unless this is relates).
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TinheadNed · Posted: Thu Apr 16, 2009 4:43 pm Post subject:

syslog-ng 2.1.4 isn't building for me on 2.1.4, I've put a bug out.

I have no idea how to fix it.

Hwoarang · Posted: Tue May 05, 2009 11:36 am Post subject:

Fresh new ( 2 months ) Phenom installation, full --as-needed enabled. No problems at all

Yamakuzure · Posted: Wed Jun 03, 2009 9:59 am Post subject:

Two systems:

New PhenomII based system (since march 09), with everything installed using:

rjtupas · Last edited by rjtupas on Sun Aug 02, 2009 5:59 am; edited 3 times in total

Set LDFLAGS to --as-needed and performed emerge -e world. Only issues encountered so far:

1. Snort would segfault on startup. Commented out LDFLAGS entry in make.conf and rebuilt snort to fix the problem. I suppose "fix" is a bad choice of words, but at least it confirmed the failure was due to the --as-needed LDFLAG.

2. During emerge -e world, setools would fail to compile. I have since rebuilt my system (emerge -e world) with the --as-needed LDFLAG disabled. Setools still fails to compile with the same error in libseaudit/swig/python. So at least this error is NOT due to the --as-needed LDFLAG. I will submit a separate bug on this one.

The errors stated,

Bircoph · Apprentice Joined: 27 Jun 2008 Posts: 241

I read this topic, mostly it is success story and I tried myself. My make.conf is available here: http://forums.gentoo.org/posting.php?mode=quote&p=5871986

For the start I tested on single, but near-critical application for me: sci-physics/root. This is complicated and rather fragile program, thus this is good test for anything new, especially taking into account I need it for my work.

So I changed added "-Wl,--as-needed" to my LDFLAGS. root compiles ok, it starts ok, e.g. no unresolved symbol failures, it works. But(!) on some functions it failed, it silently freezes, no error messages, no logs, it just hangs up. strace reveals a failure point in some futex() lockup after dynamical loading of some libs and object dictionaries, I haven't explored the problem further.

In no doubt this is fixable, but I'm afraid with a large effort, I doubt recursive recompilation of all involved libraries will help (root's dictionaries systems sometimes makes me cry).

What is worse, this failure is run-time and silent. I can afford compilation failure of application due to some option, I may handle this in time or fallback to previous state, but run-time failure of mission-critical application is absolutely unacceptable. That's why I consider -Wl,--as-needed as unsafe linking option and unfortunately refuse it for now.
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Mike Hunt · Watchman Joined: 19 Jul 2009 Posts: 5287

I've been using -Wl,--as-needed for at least 2-3 years - maybe longer. Used to be imlib failed to emerge with -Wl,--as-needed but that has been solved for a long time.

The only issue today is media-plugins/live and samba fail to build with -Bdirect. Otherwise everything runs perfectly.