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Re: [INTERFACES] C & C ++Program Problem

From: Arindam Haldar <arindamhaldar(at)hotpop(dot)com>
To: Ted Petrosky <tedpet(at)symcom(dot)com>,pgsql-interfaces(at)postgresql(dot)org, pgsql-general(at)postgresql(dot)org,kalelkar(at)hotmail(dot)com
Subject: Re: [INTERFACES] C & C ++Program Problem
Date: 2002-05-16 12:19:17
Message-ID: 3CE3A3C5.1050000@hotpop.com (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-interfaces
on my RedHat 7.2 i have inserted these lines in the file /etc/ld.so.conf
/usr/lib/pgsql-7.2
using gcc -lpq egtry.c gives error-->
/usr/bin/ld: cannot find -lpq
collect2: ld reurned 1 exit status

am very newto c , can u tellhow to use -lpq ??
thanx in anticipation
A.H

Ted Petrosky wrote:

> I was having the same problems. Do you have the momjiam book 
> PostgreSQL? He gives examples of compiling C and C++ programs complete 
> with the command line to start compiling (on page 195). Take a look at it (I 
> think it is also online).  You are missing the linking flag that  tells the linker 
> where the libpq.a and libpq++.a files live. libpq.a and libpq++.a is where those 
> symbols are defined.
> 
> Ted
> 
> 
> 
> -----Original Message-----
> From: Arindam Haldar <arindamhaldar(at)hotpop(dot)com>
> To: pgsql-interfaces(at)postgresql(dot)org, pgsql-general(at)postgresql(dot)org, 
> nandrews(at)investsystems(dot)co(dot)uk
> Date: Thu, 16 May 2002 12:23:19 +0530
> Subject: Re: [INTERFACES] C & C ++Program Problem
> 
> 
>>hi,
>>thanx for the hint. am re-entering c programming from DOS world !--my 
>>apologies as am again a learner. 1 more Query on to this.
>>POstgres-7.2 was not configured with-->--with-gnu-ld , which i just saw 
>>is default set to no... So can that be problem while compling C & C++ 
>>prorgrames ?
>>thanx again in advance for ur help.
>>A.H
>>
>>Nigel J. Andrews wrote:
>>
>>
>>You need to read the error messages. It's not a postgres issue it's a 
>>linking
>>issue. Try giving the -lpq flag to gcc.
>>
>>On Thu, 16 May 2002, Arindam Haldar wrote:
>>
>>hi all,
>>am trying to use C & C++ libraries with postgresql 7.2.
>>while compiling a sample programe(attached) there were thse errors 
>>encounterd !..
>>
>>[arindam(at)my src]$
>>[arindam(at)my src]$ gcc egTry.c
>>/tmp/ccTLiExh.o: In function `main':
>>/tmp/ccTLiExh.o(.text+0x12): undefined reference to `PQconnectdb'
>>/tmp/ccTLiExh.o(.text+0x2b): undefined reference to `PQstatus'
>>/tmp/ccTLiExh.o(.text+0x5c): undefined reference to `PQerrorMessage'
>>/tmp/ccTLiExh.o(.text+0xac): undefined reference to `PQexec'
>>/tmp/ccTLiExh.o(.text+0xc5): undefined reference to `PQresultStatus'
>>/tmp/ccTLiExh.o(.text+0xf3): undefined reference to `PQclear'
>>/tmp/ccTLiExh.o(.text+0x104): undefined reference to `PQfinish'
>>/tmp/ccTLiExh.o(.text+0x12e): undefined reference to `PQntuples'
>>/tmp/ccTLiExh.o(.text+0x159): undefined reference to `PQgetvalue'
>>/tmp/ccTLiExh.o(.text+0x186): undefined reference to `PQclear'
>>/tmp/ccTLiExh.o(.text+0x197): undefined reference to `PQfinish'
>>collect2: ld returned 1 exit status
>>[arindam(at)my src]$
>>
>>lib & include dir are in /usr/lib/pgsql-7.2 & /usr/include/pgsql-7.2.
>>i have tried to compliethis programme with RH7.2(with postgres rpm & a 
>>configured from tar file)..
>>i need help pls...   i want to use C or C++
>>thanking u in advance
>>A.H
>>
>>
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