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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: using new versions of emacs without stoping a session
Date: Wed, 17 Apr 2019 19:13:28 +0300
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Wed, 17 Apr 2019 10:01:16 -0400
> 
> You can definitely edit Emacs's C code while it's running as well as
> compile this new code.

With one caveat: Windows won't let you overwrite a running executable,
so the link step of compiling Emacs will fail on Windows until you
shut down your running session.