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

> On 22 Mar 2015, at 23:04, Garrett Cooper <yaneurab...@gmail.com> wrote:
>> On Mar 22, 2015, at 15:01, Craig Rodrigues <rodr...@freebsd.org> wrote:
>> ...
>>> OK, converting expr.y to use unsigned integers would require a bit of work.
>>> Can you commit your patch to the Makefile?  It fixes the problem for now.
>> +1
>> I’d still like to know why clang 3.5 doesn’t have this behavior though — 
>> 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.

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

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