Mac OSX std.datetime / Posix daylight variable

Michel Fortin michel.fortin at michelf.com
Sun Feb 20 04:53:03 PST 2011


On 2011-02-20 00:11:11 -0500, Jonathan M Davis <jmdavisProg at gmx.com> said:

> Posix defines the tzset function along with a few helper items. From the Linux
> man page:
> 
> extern int daylight;
> extern long timezone;
> extern char *tzname[2];
> void tzset(void);
> 
> It seems that while these _are_ Posix, not all Posix systems declare 
> all of them
> (which baffles me, but that's the way it goes it seems). tzset seem pretty
> universal, and I believe that tzname is essentially universal, but I'm not so
> sure about the others.
> 
> Currently, std.datetime uses tzset, tzname, and daylight on all Posix systems.
> It appears that for some reason, daylight is not declared on FreeBSD (
> http://d.puremagic.com/issues/show_bug.cgi?id=5616 ). What I want to confirm is
> that this is _not_ a problem on Mac OS X.
> 
> As I understand it, std.datetime has been working just fine on Mac OS X, which
> would indicate that daylight _is_ declared on Mac OS X. Can anyone 
> confirm this?
> If it is indeed the case, I'd like to have daylight added to druntime (where it
> belongs) for OSX. But if it's not actually on OSX, then we definitely 
> don't want
> to declare it there.

time.h has daylight in the Mac OS X 10.6 SDK:

extern int daylight;

-- 
Michel Fortin
michel.fortin at michelf.com
http://michelf.com/



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