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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: New warnings on emacs-26 branch with gcc 8.2.0
Date: Mon, 06 Aug 2018 18:16:47 +0300
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> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Mon, 06 Aug 2018 09:30:27 +0100
> 
> Why does it need to check every gcc warning though, rather than just the
> -W* and -Wno-* warnings that have been requested in the configury ?

Because different versions of GCC support different warning options,
and using an option that is not supported by the installed version of
GCC will cause warnings and sometimes errors.