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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 15:49:13 +0200
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To: Juanma Barranquero <lekktu@gmail.com>
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 (message from Juanma Barranquero on Tue, 15 Nov 2022 05:23:56 +0100)
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> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Tue, 15 Nov 2022 05:23:56 +0100
> Cc: emacs-devel@gnu.org
> 
> I see the output of several parallel instances of make (run with a single "make -j4") intermixed.

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.