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Subject: Re: [gentoo-user] preparing for profile switch -- major problem
To: gentoo-user@lists.gentoo.org
References: <m3zi6vjdnh.wl-covici@ccs.covici.com>
<bf05d01a-78c6-f940-0e63-e3860cb14e90@gmail.com>
<m3vahik0c4.wl-covici@ccs.covici.com>
From: Alan McKinnon <alan.mckinnon@gmail.com>
Message-ID: <b263200f-e0b5-a8b2-1e8f-0cbff9e3ed2a@gmail.com>
Date: Fri, 8 Dec 2017 18:42:16 +0200
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On 07/12/2017 17:46, John Covici wrote:
> On Thu, 07 Dec 2017 09:37:56 -0500,
> Alan McKinnon wrote:
>>
>> On 07/12/2017 07:44, John Covici wrote:
>>> Hi. In preparing for the profile switch and the emerge -e world, I
>>> have run into a serious problem with perl. I think I saw on this list
>>> where perl 5.26 was going to have problems -- maybe until it is
>>> stabilized -- but if I mask it off, I get the following:
>>
>> Unmask the latest perl and update world with the old profile
>>
>> This will go smoothly as the perl team did an excellent job making sure
>> everything perl-ish in the tree works in concert with everything else.
>> However I do recall that trying to do it with a partial world update
>> didn't work - too many affected packages, so trying just perl + deps did
>> not work. Rather do a normal world update.
>>
>> Once done, then switch your profile to 17.0 and do the giant emerge -e
>> world that requires.
>>
>> tl;dr
>>
>> the news message about perl might make you think the sky will fall on
>> your head and all your kittens will die, this is actually not true.
>>
>> The v5.26 updates mostly had to do with perl's search path for perl
>> modules. Just like how we've frowned on having "." in the shell PATH for
>> decades, perl now implemented something like that for modules too. The
>> possible problem anticipated is that modules would now break if a
>> modules could not find another module it needs. But this really only
>> applied to modules outside the perl distribution itself. And the Gentoo
>> perl team dealt with all that already
>>
>> It's widely discussed all over the internet in all the usual places, you
>> are only affected if one of more of these applies:
>>
>> - you write perl modules yourself (solution: update your own code)
>> - you use many ancient cpan modules that no-one touched for yonks
>> (solution: maybe use currently supported modules instead)
>> - you heavily rely on a third party perl app that might not have been
>> updated - musicbrainz and radiator come to mind as examples (solution:
>> harass your app vendor)
>>
>> --
>> Alan McKinnon
>> alan.mckinnon@gmail.com
>>
>>
>
> So, I have already switched to the new profile, should I switch back,
> do a regular world update, or do the world update with the new profile
> -- I am compiling gcc as I write, although its not finished yet, I can
> interrupt it if necessary.
>
No, I don't think you should revert the profile change. I understood
from your mail than you had not done that yet, and typed accordingly.
I think Michael is on the right track with backtrack - set it to
something very high like 1000, see if that gets to a solution.
--
Alan McKinnon
alan.mckinnon@gmail.com