[PATCH] Detect GNU/kFreeBSD in user-visible kernel headers

[Warner Losh]

On Nov 16, 2011, at 11:26 AM, Robert Millan wrote:

> 2011/11/16 Xin LI <delphij at delphij.net>:
>> Just my $0.02 -- I think we should probably do it in a more
>> centralized place -- otherwise in case someone imported some new code,
>> they have to do the same defined(__FreeBSD__) ||
>> defined(__FreeBSD_kernel__)?
> 
> How about something like:
> 
> #if defined(__FreeBSD__) && !defined(__FreeBSD_kernel__)
> #define __FreeBSD_kernel__
> #endif
> 
> it can be placed at beginning of each header, then the rest becomes
> much simpler.
> 
> Note this has the side-effect of defining __FreeBSD_kernel__ on
> FreeBSD, which I suspect some people won't be fond of.  An alternative
> could be to come up with an ad-hoc macro that means "this system is
> either FreeBSD or uses the same kernel as FreeBSD" and define it where
> needed.

I had a similar suggestion...

Why do you think people wouldn't be fond of the __FreeBSD_kernel__ being defined?

Warner