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From: Giles Lean on 15 May 2010 04:46

Tom Lane <tgl(a)sss.pgh.pa.us> wrote:

> I suppose that at least some of the *BSD herd really do predefine some
> of the symbols being attributed to them here, but I would like to see
> something authoritative about which and what.

Documentation follows, but first the summary:

FreeBSD: __FreeBSD__
NetBSD: __NetBSD__
OpenBSD: __OpenBSD__

I believe those #defines also tell you what the release is.
I didn't look into their encoding schemes just now, but can if
you want.

(OS X aka Darwin is harder: they seem to like __APPLE__, but
to determine the OS version the best I can see is
__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__, which is quite
horrid.)

Re BSDi, I have no idea really but based on Google searching
I'd bet on __bsdi__.

Per Wikipedia BSDi was discontinued in 2003 and support ended
in 2004. I submit that anyone still using it is not likely to
be updating their PostgreSQL installation, so +1 from me for
dropping support for it unless a volunteer using it comes
forward.

FYI (and you may know this, but I didn't learn until recently)
GCC will tell you quite easily what #defines are predefined,
and all those platforms use gcc:

$ cc -E -dM - < /dev/null | grep FreeBSD
#define __FreeBSD_cc_version 700003
#define __VERSION__ "4.2.1 20070719 [FreeBSD]"
#define __FreeBSD__ 7

But you wanted something authoritative, so here's what I found:

FreeBSD
=======

http://www.freebsd.org/doc/en/books/porters-handbook/porting-versions.html

"__FreeBSD__ is defined in all versions of FreeBSD."

NetBSD
======

From the NetBSD-1.1 release notes (November, 1995):

"* implement new cpp predefine strategy
define __NetBSD__, ..."

This is still the current behaviour, although the current
release is 5.0.2 from February 2010.

OpenBSD
=======

http://www.openbsd.org/porting.html

"Generic Porting Hints

* __OpenBSD__ should be used sparingly, if at all. Constructs that
look like

#if defined(__NetBSD__) || defined(__FreeBSD__)

are often inappropriate. Don't add blindly __OpenBSD__ to
it. Instead, try to figure out what's going on, and what actual
feature is needed."

Regards,

Giles

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From: Andrew Dunstan on 15 May 2010 06:14


Bruce Momjian wrote:
> Peter Eisentraut wrote:
>
>> On l?r, 2010-05-15 at 00:23 -0400, Robert Haas wrote:
>>
>>> It's a commercial distribution of BSD. I remember it being pretty
>>> nice when I used it 10+ years ago, but it sounds like it's dead now.
>>>
>> BSDI is the company that produced BSD/OS, which was Bruce's main
>> development environment at some point, which is why it has left
>> excruciating traces all over the PostgreSQL source.
>>
>
> Uh, I still run BSDi.
>
>

That's more or less the OS equivalent of writing with a quill. :-)

cheers

andrew

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