Re: address warnings from GCC's UB sanitizer

[Paul Eggert]

Paul Eggert wrote:
> Akim Demaille wrote:
> > Are you aware of any way to use this macro and avoid these spurious warnings?
>
> Sure, don't use -Wtype-limits and don't use 
> -Wtautological-constant-out-of-range-compare. That's standard practice in other 
> GNU projects. These warnings generate too many false alarms in code that checks 
> for integer overflow properly.

I should also mention that recent GCC versions do better in this area, due to 
the fact that they have builtins that avoid the warnings. So one possibility is 
to enable those particular warnings only if GCC is new enough. However, I 
haven't bother to do that myself, as I haven't found the warnings useful (too 
many false alarms anyway).