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Re: libpq and libecpg problems on MacOs-X (Panther/10.3.3)

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Richard Frith-Macdonald <richard(at)brainstorm(dot)co(dot)uk>
Cc: pgsql-ports(at)postgresql(dot)org
Subject: Re: libpq and libecpg problems on MacOs-X (Panther/10.3.3)
Date: 2004-05-20 00:55:09
Message-ID: 200405200055.i4K0t9o02256@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-ports
Richard Frith-Macdonald wrote:
> When trying to use postgresql on my MacOS-X system (10.3.3) I 
> encountered the problem that the libecpg and libpq dynamic libraries 
> could not be linked into my applications.
> 
> Upon investigation, it turns out that the postgresql libraries on 
> MacOS-X/Darwin are being built as 'bundles' ... which means that you 
> can dynamically load them into a running program using the dlopen() 
> api, but you can't link them at application build time.  This may be 
> correct behavior for some of the modules in postgres (eg the perl 
> module), but is certainly wrong for libecpg and libpq ... which are 
> meant to be linked with C (and other language) applications.
> 
> I attach a patch which fixes this for MacOS-X 10.3.3, by altering the 
> makefiles to understand the two ways of building a library/bundle and 
> having a variable setting 'BUNDLE=no' to day that the normal dynamic 
> library should be built rather than a bundle.  The patch alters the 
> libecpg and libpq makefiles to set this variable, so these two are 
> built as normal dynamic libraries, while the other code continues to be 
> built as bundles.
> 
> Probably there are other parts of the system which should not be 
> bundles either ... but I don't use them so I don't know.
> Possibly behavior differs in older versions of MacOS-X ... again, I 
> don't have the old systems so I don't know.

This sounds very strange.  If you can't link libpq into your
application, why can psql link in libpq?

I am going to need another MacOSX person to comment on this before
applying this change because I thought things were fine on OS X.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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Subject: Re: libpq and libecpg problems on MacOs-X (Panther/10.3.3)
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Subject: Re: [PORTS] Building PgSQL 7.4.2 on SGI Irix 6.19

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