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From: Florian Weimer <fweimer@redhat.com>
Newsgroups: gmane.linux.lib.musl.general
Subject: Re: Detecting musl at compile and/or configure time
Date: Tue, 02 Jul 2019 14:19:13 +0200
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To: Samuel Holland <samuel@sholland.org>
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* Samuel Holland:

> The Linux UAPI is stable, so you can use whatever features you want as long as
> you gracefully handle ENOSYS/EINVAL (or document a minimum supported version).

Note that this only applies to the numbered syscall interface.  For
example, it is not true for vsyscall (which is now considered optional,
despite part of the userspace ABI at first, and really hard to detect
properly).  Netlink packet layout also keeps changing for some
subsystems.

Thanks,
Florian