Hi Giacinto,

>> Not according to any compiler I tried.  I literally tested this before
>> sending the above email on both GCC 7.3 and GCC 8.2.  So what compiler
>> are you using?
> 
> default ubuntu 18.04 compiler:
> gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0

This was the same on my box.  I bet you were just missing the

if (auth_to_foo() < 0) part

> I will submit a new patch later today.
> Would you please comment on the [PATCH 4/6] too, about the plugins, so
> I will take care of both together?
> 

Done.  And please re-submit the entire series.  Otherwise I get lost 
what version goes with what.

Regards,
-Denis