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To: gentoo-dev@g.o
From: Pacho Ramos <pacho@g.o>
Subject: Re: Adding --as-needed to LDFLAGS in profiles/default/linux/make.defaults
Date: Mon, 28 Jun 2010 10:42:29 +0200
El lun, 28-06-2010 a las 06:39 +0530, Nirbheek Chauhan escribió:
> Hello everyone,
> 
> I'm sure at least half of you are thinking "Oh no, not this again...",
> and I agree. However, I'm /also/ thinking "Why the heck haven't we
> done this yet?"
> 
> We've been discussing this since 2008, and probably waaay before that
> too. The entire discussion about whether we should do this or not has
> already passed, there is NO NEED to have that again. This email is
> about discussion on what all is *left* before we can do $SUBJECT.
> 
> What prompted this email? libpng-1.4 and many other upgrades that have
> left gentoo systems very very broken. We have to resort to random
> scripts to fix breakage, which reflects very badly on us. Even worse,
> a lot of users just give up and reinstall their system, or don't
> upgrade, or just move away from Gentoo.
> 
> I understand that these kind of breakages are inevitable, but with
> as-needed, we can reduce their effect *drastically*. Instead of having
> to rebuild almost their entire system, the user would only need to
> rebuild packages that directly link(ed) to libpng. I honestly think
> that we cannot afford to expose our users to any more such upgrades
> without as-needed in the default linux profile.
> 
> There's a tracker bug for this, and the problems still remaining are:
> http://bugs.gentoo.org/showdependencytree.cgi?id=129413&hide_resolved=1
> 
> *Most* of the problems listed there are forced-as-needed problems,
> which need to be fixed no doubt, but should NOT block addition of
> --as-needed to LDFLAGS in make.defaults which will not trigger those
> build failures.
> 
> What needs to be done now is for someone with lots of CPU power to
> grab the list of packages[1], and build them one-by-one (all
> versions), adding to a new list all the ebuilds that fail. How to
> test:
> 
> LDFLAGS="-Wl,--as-needed" emerge -v1 $atom
> 
> Once we have the list that fails with normal as-needed, we can fix
> them, get the fix upstreamed (if possible), and switch the flag on.
> This action should probably be accompanied by a news item informing
> users about the change, and encouraging them to report the (rare) bug
> which might hit them.
> 
> Let's try to make Gentoo less frustrating for our users.
> 
> 1. http://dev.gentoo.org/~nirbheek/files/as-needed-failures.list

Thanks for taking care
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Adding --as-needed to LDFLAGS in profiles/default/linux/make.defaults
-- Nirbheek Chauhan
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