Message-ID: <3F8A64DF.1080008@comcast.net>
Date: Mon, 13 Oct 2003 02:39:59 -0600
From: "D. Stimits" <stimits@comcast.net>
Reply-To: stimits@comcast.net
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Cc: postgresql <pgsql-interfaces@postgresql.org>
Subject: Re: more on undefined reference to 'pg_detoast_datum'
References: <3F886324.8020707@comcast.net> <558.1065936082@sss.pgh.pa.us>
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Tom Lane wrote:

> "D. Stimits"  writes:
>
> >Apparently in PosgreSQL 7.2.3 (the Redhat 7.3 version, which has some
> >patching involved), pg_detoast_datum is defined in fmgr backend code,
> >but this function is not defined anywhere in any library, especially not
> >libpq.
>
>
> Of course not; it's a backend function.  Your problem is that you are
> trying to build a server-side function as though it were a client
> application.  You're linking to an inappropriate set of libraries.
> See the contrib modules for numerous examples of correct link setup
> for server-side functions.
>
> 			regards, tom lane
>

My attempt to try linking against some of the client libraries was to 
find a link source for CurrentMemoryContext and MemoryContextAlloc. The 
headers for backend development include prototypes as extern for many 
functions, such as those above. It's painfully obvious that glibc does 
not provide these definitions, and it is obvious also that the client 
libraries do not implement these. My question is, where the heck is 
CurrentMemoryContext and MemoryContextAlloc provided as an 
implementation which I can link with? It looks like the Redhat 7.3 
(PostgreSQL 7.2.3) devel rpm package is missing the library needed. Or 
perhaps there is no such library, and I'd be required to drop my code 
into the complete source of the SQL server itself, which is most 
inconvenient. How the heck do I find an implentation of 
CurrentMemoryContext and MemoryContextAlloc? Running ldd on sample 
contrib libraries leads me to believe that in order to build this code, 
I must have a built full PostgreSQL source installed and configured, and 
that these functions are not available as a linkable library. Which .o 
object file would I link? Why isn't CurrentMemoryContext or 
MemoryContextAlloc available in a linkable library instead?

D. Stimits