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Date:      Sun, 22 Mar 2015 23:09:40 +0100
From:      Dimitry Andric <dim@FreeBSD.org>
To:        Garrett Cooper <yaneurabeya@gmail.com>
Cc:        Craig Rodrigues <rodrigc@FreeBSD.org>, "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:  <72ABF177-320F-4CB1-8B05-36B133714C55@FreeBSD.org>
In-Reply-To: <08BB20A2-7B71-4ECF-B246-F3096CABA5E9@gmail.com>
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>

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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).

Because this version optimizes better around undefined behavior.  There
are most likely many issues lurking around, and most certainly in ports.

I would recommend using UBSan to tackle this kind of thing.

-Dimitry


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