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Date: Mon, 3 Jul 2017 20:46:10 +0200
From: Kurt Jaeger <lists@opsec.eu>
To: Chris Ross <cross+freebsd@distal.com>
Cc: freebsd-stable@freebsd.org
Subject: Re: Compile-time check for clock_nanosleep()
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Hi!

>   Some time ago, I ported a linux program that was using clock_nanosleep().
> I see now that the extra code I'd put in isn't needed anymore in 11-stable,
> as it appears this call was added in 11.1.  My question is, to
> properly protect these changes, what is the best way to know at
> compile time, either (a) that that call is in libc, or (b) that
> I'm compiling on FreeBSD 11.1 or later ?

Use __FreeBSD_version from sys/param.h:

https://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/versions.html

-- 
pi@opsec.eu            +49 171 3101372                         3 years to go !