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Subject: Re: Jenkins build is still unstable: FreeBSD_HEAD-tests2 #867
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From: Dimitry Andric <dim@FreeBSD.org>
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Date: Sun, 22 Mar 2015 22:23:30 +0100
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To: Craig Rodrigues <rodrigc@FreeBSD.org>
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On 22 Mar 2015, at 22:02, Craig Rodrigues <rodrigc@FreeBSD.org> wrote:
> 
> On Sun, Mar 22, 2015 at 11:26 AM, <jenkins-admin@freebsd.org> wrote:
> 
>> See <https://jenkins.freebsd.org/job/FreeBSD_HEAD-tests2/867/>
>> 
> 
> Can someone with toolchain expertise look at this?
> After the clang 3.6.1 import, /bin/expr behaves differently.
> 
> With clang 3.5.0:
> 
> # expr 4611686018427387904 + 4611686018427387904
> expr: overflow
> 
> With clang 3.6.1:
> 
> # expr 4611686018427387904 + 4611686018427387904
> -9223372036854775808

It works fine for me:

$ /usr/obj/usr/src/bin/expr/expr 4611686018427387904 + 4611686018427387904
expr: overflow

Are you using any special compilation flags?  That said, having taken a
quick look at expr.y, it does seem to rely on signed integer wrapping.

-Dimitry


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