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Date:      Sun, 22 Mar 2015 15:11:22 -0700
From:      Garrett Cooper <yaneurabeya@gmail.com>
To:        Dimitry Andric <dim@FreeBSD.org>
Cc:        "freebsd-testing@freebsd.org" <freebsd-testing@freebsd.org>, freebsd-current Current <freebsd-current@freebsd.org>, "jenkins-admin@freebsd.org" <jenkins-admin@freebsd.org>, freebsd-toolchain@freebsd.org
Subject:   Re: Jenkins build is still unstable: FreeBSD_HEAD-tests2 #867
Message-ID:  <FA0D53E2-8298-44C9-9C40-B97D17E3A7BB@gmail.com>
In-Reply-To: <72ABF177-320F-4CB1-8B05-36B133714C55@FreeBSD.org>
References:  <1669399171.13.1427029129760.JavaMail.jenkins@jenkins-9.freebsd.org> <799490341.14.1427048792932.JavaMail.jenkins@jenkins-9.freebsd.org> <CAG=rPVeyamLPnC5i05_=Ub0D%2BV256U_8t8R5tfDitC=NkjBOFQ@mail.gmail.com> <BE5A3694-E1D1-4A47-8707-D6214E997363@FreeBSD.org> <494AEF4B-0AF8-449A-9B41-9AC4F4552AF0@FreeBSD.org> <CAG=rPVchdm_VaTshq%2BRN%2BkHX0YC0_Tsx22oJVNNnoOamdm00mQ@mail.gmail.com> <864EB4DB-2DF7-4294-9498-95E54E6B49CC@FreeBSD.org> <CAG=rPVdP_TAmerKh_82EravEw=sCj4LyEBu-NfGCK0Obg=HMVw@mail.gmail.com> <08BB20A2-7B71-4ECF-B246-F3096CABA5E9@gmail.com> <72ABF177-320F-4CB1-8B05-36B133714C55@FreeBSD.org>

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On Mar 22, 2015, at 15:09, Dimitry Andric <dim@FreeBSD.org> wrote:

> On 22 Mar 2015, at 23:04, Garrett Cooper <yaneurabeya@gmail.com> =
wrote:
>>=20
>> On Mar 22, 2015, at 15:01, Craig Rodrigues <rodrigc@FreeBSD.org> =
wrote:
>>=20
>> ...
>>=20
>>> OK, converting expr.y to use unsigned integers would require a bit =
of work.
>>>=20
>>> Can you commit your patch to the Makefile?  It fixes the problem for =
now.
>>=20
>> +1
>>=20
>> I=92d still like to know why clang 3.5 doesn=92t have this behavior =
though =97 there might be other potential issues lurking around that =
need to be solved (either here, in ports, or both).
>=20
> Because this version optimizes better around undefined behavior.  =
There
> are most likely many issues lurking around, and most certainly in =
ports.
>=20
> I would recommend using UBSan to tackle this kind of thing.

I hope this got a ports tinderbox run first=85 Adding UBSan to tinderbox =
runs for toolchain upgrades [in the future] might be a good idea.

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