Deprecation of stuff

[Viktor Dukhovni]

+1 (and more) to the below!

> On Sep 4, 2019, at 10:15 AM, David Woodhouse <dwmw2 at infradead.org> wrote:
> 
> I'd note that the question of *versioning* mechanisms is a very very
> special case of "when to deprecate stuff". So much so as to almost make
> it a completely separate question altogether.
> 
> My own favourite application is littered with checks on
> OPENSSL_VERSION_NUMBER, and the occasional call to SSLeay() to check
> for things that were fixed at runtime without an ABI change.
> 
> http://git.infradead.org/users/dwmw2/openconnect.git/blob/HEAD:/openssl.c
> http://git.infradead.org/users/dwmw2/openconnect.git/blob/HEAD:/openssl-dtls.c
> 
> A change to the versioning scheme is very much more than just another
> thing that's been deprecated; it's a change to the very mechanism by
> which we handle those deprecations. Changing that (and by extension,
> rapidly deprecating it) requires a lot more work on the part of
> application authors who want their code to build against whatever
> version of OpenSSL may be present on the platforms they need to
> support.

-- 
	Viktor.