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

[Paul Eggert]

Andy Moreton wrote:

> cc1.exe: warning: -Wabi won't warn about anything [-Wabi]
> cc1.exe: note: -Wabi warns about differences from the most up-to-date ABI, 
> which is also used by default
> cc1.exe: note: use e.g. -Wabi=11 to warn about changes from GCC 7

I noticed this problem a while ago on Fedora in several GNU projects, and fixed 
it for Emacs master in commit 2018-06-30T00:31:address@hidden

To avoid the problem entirely in the emacs-26 I'd run admin/merge-gnulib and 
update everything from Gnulib as it's not worth the trouble to cherry-pick these 
sorts of fixes from master. If we'd rather not do admin/merge-gnulib, then we 
can just suggest './configure --disable-gcc-warnings' and/or 'make 
WERROR_CFLAGS=' to emacs-26 developers; either of these should work around the 
problem. (Builders from tarballs needn't worry about this, as GCC warnings are 
disabled for them by default.)

> Can this be simplified to be less over-zealous and less time consuming ?
The overzealous-warning part has been fixed on master. I'm sure 'configure' 
could be sped up, if someone wants to take the time to work on that.