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

[Sean McBride]

On Mon, 15 Oct 2012 20:39:21 +0200, Jean-Daniel Dupas said:

>> I see that there have been recent changes wrt -fcatch-undefined-
>behavior, and within the last week or so something changed such that my
>own build of clang (built with CMake on OS X) is unable to build simple
>programs that use -fcatch-undefined-behavior, I get link errors like:
>> 
>>  "___ubsan_handle_divrem_overflow", referenced from:
>>      _main in test-OSZvjm.o
>>  "___ubsan_handle_type_mismatch", referenced from:
>>      _main in test-OSZvjm.o
>> 
>> Any ideas why?
>> 
>
>This is a new feature. Instead of generating traps, -fcatch-undefined-
>behavior generates library calls that make it easier to find what is
>wrong (each undefined behavior calls a different function).
>
>This functions are provided by the ubsan library that is part of
>compiler-rt. But I'm not sure the integration to the Makefile build
>system is done yet.

You mean with the CMake build system?  Perhaps if I build using autotools it will work?  Or do you mean it works nowhere yet?

Cheers,

-- 
____________________________________________________________
Sean McBride, B. Eng                 sean at rogue-research.com
Rogue Research                        www.rogue-research.com 
Mac Software Developer              Montréal, Québec, Canada