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Date: Tue, 19 May 2020 10:28:57 -0400
From: Rich Felker <>
To: Wietse Venema <>
Subject: Re: Outgoing DANE not working

On Tue, May 19, 2020 at 10:23:18AM -0400, Wietse Venema wrote:
> Rich Felker:
> > The is fundamentally no build-time test possible for this. Even if we
> > were willing to make flags for each bug (or missing feature) that was
> > ever fixed indicating the change, that would only tell you whether the
> > version present at build time had the property, not whether the
> > version present at runtime does. With a distro, unless the distro
> If you can provide a libc-musl runtime __version variable, then
> Postfix can at run time determine that the library supports the
> necessary functionality, and enable/disable DANE accordingly.

We've been over this countless times from folks requesting version
numbers. A version number does not tell you what you want to know.
Distros will patch the functionality into whatever version they're
shipping. A 1.1.25 (if it ever happens) will likely have the patch
backported (just applied; no conflict). Querying features has to be
done on a per-feature basis not based on version numbers. See the
proposal on libc-coord.

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