Vincent Lefevre writes ("Re: Having fun with the following C code (UB)"):
> On 2014-04-10 11:48:44 +0000, Thorsten Glaser wrote:
> > And GCC is a repeat offender which actually does do that.
>
> If you don't like that, you should use the -fwrapv option.
Sadly that doesn't deal with all of these malicious optimisations.
But it is a good start. Personally I think we should compile the
whole distro (or at least most of it) with -fwrapv.
Ian.