[cfe-dev] recent change broke -fcatch-undefined-behavior

Richard Smith richard at metafoo.co.uk
Tue Nov 13 16:17:39 PST 2012

On Tue, Nov 13, 2012 at 3:08 PM, Sean McBride <sean at rogue-research.com> wrote:
> On Tue, 16 Oct 2012 23:35:37 -0700, Richard Smith said:
>>> >Right now, we could just emit calls to @llvm.trap on unsupported
>>> platforms,
>>> >but some of the remaining checks actually need runtime library support. I
>>> >would prefer to get the runtime working on more platforms, rather than
>>> >working around its absence.
>>> Thanks to all for the explanations.
>>> I guess I'm playing with fire by using svn trunk, but for me, this is a
>>> big regression: -fcatch-undefined-behavior has gone from a imperfect but
>>> helpful tool to be totally broken.  I do hope it'll work again before 3.2?
>>Yes, I've been promised access to a Mac, and I'll get it working there, if
>>no-one else gets there first :)
> Hi,
> With 3.2 now in RC phase, I'd thought I'd pester about -fcatch-undefined-behavior on OS X...  It worked in 3.1, will it be restored in 3.2?  I don't see anything connected to it here:
> <http://llvm.org/bugs/show_bug.cgi?id=13893>
> Do you need a bug report?

Thanks for the prod, I've checked in some pending patches to add OS X
support, in r167888, r167889, and r167890. If you could build
clang_rt.ubsan_osx and let me know whether everything is working as
intended, that'd be great; we can then ask to get those patches pulled
onto the 3.2 branch.

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