freebsd stable - Jul 2017 - Compile-time check for clock_nanosleep()

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 ?

  Thanks.

                   - Chris
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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 at opsec.eu            +49 171 3101372                         3 years to go
!