Re: [GENERAL] Querying libpq compile time options

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Larry Rosenman <lrosenman(at)pervasive(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Martijn van Oosterhout <kleptog(at)svana(dot)org>, spaminos-sql(at)yahoo(dot)com, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [GENERAL] Querying libpq compile time options
Date: 2006-05-17 17:15:00
Message-ID: 200605171715.k4HHF0d27517@candle.pha.pa.us
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Larry Rosenman wrote:
> Bruce Momjian wrote:
> > Larry Rosenman wrote:
> >> Tom Lane wrote:
> >>> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> >>>> I thought about this. Attached is a patch you can use to
> >>>> popen("pg_config") and then look for the thread flag to configure.
> >>>> One idea would be to add this sample to our libpq documentation.
> >>>> The problem with the example is popen() overhead, pg_config not in
> >>>> $PATH, or pg_config's version not matching libpq's version.
> >>>
> >>> Yeah, the last point seems like a killer objection :-(. It'd be
> >>> better to add some sort of libpq function to handle the issue.
> >>>
> >>
> >> and when I've proposed libpq functions to expose compile-time
> >> constants, I've been shot down.
> >>
> >> How is this different?
> >
> > No idea, what is the URL of your proposal. Keep in mind this is not
> > option-specific.
>
> I had made a proposal to expose the path used for pg_service.conf.

Why would an application programmer care to know the location of
pg_service.conf?

> Would it be better to make a structure that has ALL the options, and
> return
> that from ONE function?

I can't think of an easy way to do that.

--
Bruce Momjian http://candle.pha.pa.us
EnterpriseDB http://www.enterprisedb.com

+ If your life is a hard drive, Christ can be your backup. +

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