C & C ++Program Problem

On Thu, May 16, 2002 at 04:07:38AM +0530, Arindam Haldar wrote:

am trying to use C & C++ libraries with postgresql 7.2.
while compiling a sample programe(attached) there were thse errors
encounterd !..

Are you linking your program with libpq? It would seem that this may
not be the case, but you need to.

Jeroen

On Thu, May 16, 2002 at 04:07:38AM +0530, 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@my src]$
[arindam@my src]$ gcc egTry.c

Try: gcc egTry.c -lpq

(or is it -lpg?)

The compiler needs to know which library contains the symbols you're
missing.

HTH,
--
Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/

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@my src]$
[arindam@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@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

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:

Arindam Haldar <arindamhaldar@hotpop.com> writes:

on my RedHat 7.2 i have inserted these lines in the file /etc/ld.so.conf
/usr/lib/pgsql-7.2

This may or may not be necessary, but if you do it you need to run
'ldconfig' in order for it to take effect.

using gcc -lpq egtry.c gives error-->
/usr/bin/ld: cannot find -lpq
collect2: ld reurned 1 exit status

You need to add a -L flag to the compile so gcc looks in the right
place for libraries. Also, the '-lpq' should go *after* your source
file name. So:

gcc -o egtry egtry.c -L/usr/lib/pgsql-7.2 -lpq

That should get you a lot closer to working.

-Doug