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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: `gzip` dependency
Date: Mon, 11 Jan 2021 17:46:23 +0200
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Cc: emacs-devel@gnu.org, phillip.lord@russet.org.uk
To: Stefan Monnier <monnier@iro.umontreal.ca>
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In-Reply-To: <jwvr1mr7cb4.fsf-monnier+emacs@gnu.org> (message from Stefan
 Monnier on Mon, 11 Jan 2021 09:59:19 -0500)
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: phillip.lord@russet.org.uk,  emacs-devel@gnu.org
> Date: Mon, 11 Jan 2021 09:59:19 -0500
> 
> My question was instead about whether or not Emacs does indeed make use
> of `zlib-decompress-region` when it tries to read a gzipped Info file,

No, I don't think we do.

> and whether the Windows build does always provide
> `zlib-decompress-region`

Only if Emacs was built with zlib.

> or whether that function also requires an external dependency that
> may or may not be available

One needs both an Emacs compiled with zlib, and the zlib DLL
available.