bug#32189: 27.0.50; GCC 7 warning due to -Wformat-truncation=2

[Paul Eggert]

Ken Brown wrote:
> Amended patch attached.

Thanks for checking it. I installed it in master.

Eli Zaretskii wrote:

> GCC 7 is not exactly "old".

True.

> If you are saying
> that this switch does a better job in later versions of GCC,

Yes, it does in some cases. I don't know whether it does in this particular 
case. Someone would have to check. But I wouldn't bother checking since we have 
a better fix now anyway (which is often the case for this particular warning).

> maybe we should disable it for GCC 7 alone?

I'd rather not bother. Better to move on. The general rule for warnings should 
be to cater to the latest GCC, and not worry much about older ones. (I used to 
try doing things the other way and it was way more trouble than it was worth.) 
We need to cater to old compilers for correctness, but we don't need to do it 
for warnings.