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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Emacs build fails [MSYS2/MINGW64]
Date: Mon, 29 Apr 2019 17:56:39 +0300
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To: Stephen Leake <stephen_leake@stephe-leake.org>
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In-reply-to: <86tvei6n0n.fsf@stephe-leake.org> (message from Stephen Leake on
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> From: Stephen Leake <stephen_leake@stephe-leake.org>
> Date: Sun, 28 Apr 2019 09:46:32 -0800
> 
> I'm also using MSYS2/MINGW64, and building master works for me.
> 
> I have not updated mingw64 gcc in a while, so it seems a recent update
> to that causes this problem. I have gcc 7.3.0; what do you have?

Try building a fresh checkout (so the build performs a full
bootstrap), and use the default compiler switches, which should
include -O2.  I'm interested to know whether the problem is limited to
GCC 8.x.

TIA