The arithmetic stuff has already been fixed in master with

https://github.com/dovecot/core/commit
/5cccb4af850bb3ba81e73a8fb4f6881c3e1d4046.patch
https://github.com/dovecot/core/commit
/ac7aa955db4c77bbb169baa5d104a4c128674646.patch

I have not seen the second error ever, it would need more information, can you gdb to it and see what the actual value is?

Aki

> On 03 January 2019 at 13:38 Rupert Gallagher via dovecot <dovecot@dovecot.org> wrote:
>
>
> The compiler returns many warnings, and the test returns two IPv6-related errors. I am attaching both logs as reference.
>
> > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> > On Thursday, January 3, 2019 9:53 AM, Aki Tuomi <aki.tuomi@open-xchange.com> wrote:
> >
> >> We compile all core code with both gcc and clang. What sort of interesting things did you find?
> >>
> >> Aki
> >>
> >>> On 03 January 2019 at 11:50 Rupert Gallagher via dovecot < dovecot@dovecot.org> wrote:
> >>>
> >>> Please, use clang instead of gcc. Code quality can only profit from it. I just compiled 2.3.4 and compiler stderr is full of interesting problems.
> >>
> >> ---
> >> Aki Tuomi