From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: GCC bootstrap failure on ARM
Date: Sat, 10 Sep 2016 15:16:02 +0200
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In-Reply-To: <87bn0b1two.fsf@gnu.org> ("Ludovic
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To: Mark H Weaver <mhw@netris.org>
Cc: Guix-devel <guix-devel@gnu.org>

ludo@gnu.org (Ludovic Court=C3=A8s) skribis:

> Mark H Weaver <mhw@netris.org> skribis:
>
>> David Craven <david@craven.ch> writes:
>>
>>> I can help fixing package regressions if someone gets the ball
>>> rolling. Is there a reason to upgrade to gcc 5 or does it make sense
>>> to jump to gcc 6 directly? If I understand correctly most of the work
>>> required for an update to gcc 5 has already been done?
>>
>> Until the bootstrapping problem on ARM is fixed, we can't do any of
>> this.  At the moment, that's blocking us from even updating to 4.9.4,
>> nevermind 5 or 6.  If you want to help us upgrade our default GCC,
>> investigating that problem would be the best way.
>
> It might be that fixing bootstrap with GCC 5 (or 6) or ARM wouldn=E2=80=
=99t be
> much harder than with 4.9.
>
> For the record, this is how far I got with GCC 5:
>
>   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D71399

I=E2=80=99ve made some progress on this, as reported on bugzilla.  I=E2=80=
=99m now
trying to bisect the issue; however, since the bootstrapping failure of
gcc-final is due to a problem that manifests in gcc-boot0, that=E2=80=99s a=
 lot
of rebuild, and the machine I=E2=80=99m using (redhill) is slow.

Anyway, we=E2=80=99ll have a patch reverting a few 4.9.3-to-4.9.4 commits, =
and
that=E2=80=99ll allow us to proceed.  I=E2=80=99d like to reduce that patch=
 as much as
possible, but I=E2=80=99d like to stop researching by the end of next week =
so we
can then freeze core-updates.

Ludo=E2=80=99.