
> The other category is run-time behaviour, which is the present case of
> testing whether mktime() behaves a certain way when given certain
> arguments.  Another item that has been thrown around over the years is
> whether the system supports Unix domain sockets (essentially a run-time
> behaviour check of socket()).  You do not need to check these things in
> configure; you can just do it when the program runs and adjust
> accordingly.

I think in PostgreSQL there is also a third category: "features" that affect on disk
storage of data. Those can definitely not be changed at runtime, because
a change would corrupt that database. It is very hard to judge what "feature"
really has an on disk effect. It can e.g. be an application that selected a 
row that was inserted before the feature existed, do some calculations 
and insert a new row with the feature now available. Thus I think available
features should be as immune to OS feature changes as possible, but let us
postpone that discussion until after 7.1 release.

> So I would currently suggest that you define
> 
> #ifdef AIX || IRIX
> # define NO_DST_BEFORE_1970
> #endif

That would be OK for me. Where do we put that ? Imho a good place would be 
config.h.

One problem though is, that I don't have a patch, that really turns off DST before
1970 (which would be considerably more work). I only have a patch that makes
platforms, that don't have a working mktime for values before 1970, behave like 
NO_DST_... Thus more wanting a #define NO_MKTIME_BEFORE_1970.

Andreas

Mon, 22 Jan 2001 11:07:07 +0100
Zeugswetter Andreas SB  <ZeugswetterA@wien.spardat.at>
AW: AW: AW: AW: Re: tinterval - operator problems on AI
	X
Zeugswetter Andreas SB writes:

> I think in PostgreSQL there is also a third category: "features" that affect on disk
> storage of data.

We have those already, for example the locale collation order.  They are
determined when initdb is run and are then fixed for the database cluster.

> > So I would currently suggest that you define
> >
> > #ifdef AIX || IRIX
> > # define NO_DST_BEFORE_1970
> > #endif
>
> That would be OK for me. Where do we put that ? Imho a good place would be
> config.h.

That or maybe c.h.  Don't care.

-- 
Peter Eisentraut      peter_e@gmx.net       http://yi.org/peter-e/


Mon, 22 Jan 2001 18:24:27 +0100 (CET)
Peter Eisentraut <peter_e@gmx.net>
Re: AW: AW: AW: AW: Re: tinterval - operator problems on
 AI X