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

[Matthieu Monrocq]

On Wed, Oct 17, 2012 at 10:13 AM, Jean-Daniel Dupas
<devlists at shadowlab.org>wrote:

>
> Le 17 oct. 2012 à 08:35, Richard Smith <richard at metafoo.co.uk> a écrit :
>
> On Tue, Oct 16, 2012 at 8:58 AM, Sean McBride <sean at rogue-research.com>wrote:
>
>> On Mon, 15 Oct 2012 23:55:51 -0700, Richard Smith said:
>>
>> >> That's unfortunate that clang try to emit function calls on platforms
>> that
>> >> does not support it.
>> >>
>> >
>> >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 :)
>
>
> I started to work on it by patching the build system (see patches in wait
> for review on cfe-commits).
>
> I have a question though. Is there anything in the implementation of usban
> that is OS/ABI specific ?
> I had a quick look at the implementation, and didn't see any obvious
> reason it should not work on darwin as is.
>
> -- Jean-Daniel
>
>
> Ubsan is a kind of umbrella flag which should, in the long run, encompass
Asan and ThreadSanitizer. I suppose that in those latter two there might be
OS/platform specific code.

-- Matthieu
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