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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Warnings building master
Date: Wed, 14 Jul 2021 00:14:00 -0400
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To: Andy Moreton <andrewjmoreton@gmail.com>
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> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Wed, 14 Jul 2021 00:39:56 +0100
> 
> 
> Building emacs master on Windows (msys2 64bit with gcc 10.3.0) now
> generates the following warnings:

What does "now" mean?  What changed on your system that started
triggering these warnings?  Was that GCC? or system libraries/headers?
or libTIFF? or something else?  Since that code hasn't changed in
eons, it's most probably some change on your system.