[cfe-users] Clang9 UBSan and GMP

[Hans Åberg via cfe-users]

It is just an abort trap. The ‘make check' also passes if turning off optimization. I would have expected UBSan to not change anything in optimization, but merely report the issues it finds. Apparently it finds nothing, so it may suggest a compiler bug.


> On 25 Oct 2019, at 22:34, David Blaikie <dblaikie at gmail.com> wrote:
> 
> Hard to know what might be happening - what sort of failure you're seeing, etc. Perhaps UBSan is stabilizing/changing unspecified rather than undefined behavior - or the test is failing due to some undefined behavior that UBSan doesn't catch, etc.
>