Re: New warnings on emacs-26 branch with gcc 8.2.0

[Paul Eggert]

Andy Moreton wrote:
> I was hoping you could provide more background, as you are are shown as
> the most recent committer of almost every line of configure.ac related
> to warnings.

Yes, I adapt this stuff for Emacs. However, it sounds like the part you want 
changed comes from a part of Gnulib that I do not know as well.

> Is this problem arising from use of the gnulib manywarnings module ? If
> so, why do we use it and not the simpler gnuslib warnings module ?

The warnings module would require the hand-maintained Emacs source code to list 
the exact set of warnings that it wants, which would be a pain to maintain as 
the set commonly changes after each GCC release. The manywarnings module 
maintains such a list for us, which is simpler for Emacs proper (and allows us 
to share this mutating list among several GNU projects). The Emacs configure.ac 
tailors the Gnulib list a bit, but mostly leaves it alone; this is simpler for 
Emacs than maintaining its own sort-of-copy of the list by hand.