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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Race condition on make?
Date: Tue, 15 Nov 2022 22:11:55 +0200
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To: Juanma Barranquero <lekktu@gmail.com>
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 (message from Juanma Barranquero on Tue, 15 Nov 2022 20:00:27 +0100)
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> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Tue, 15 Nov 2022 20:00:27 +0100
> Cc: emacs-devel@gnu.org
> 
> On Tue, Nov 15, 2022 at 2:49 PM Eli Zaretskii <eliz@gnu.org> wrote:
> 
> > That's because 4 programs are writing at the same time to the same
> > device.  The OS in most cases succeeds in separating the outputs, but
> > that is not guaranteed.
> 
> Ok, though I had never seen such a thing before in many, many emacs compilations and bootstrappings.

It's very rare on MS-Windows, at least IME.