Обсуждение: errors when making examples in /src/test/examples

Hi,


I am just trying to make the frontend programs in /src/test/examples
There seems to be some problem with finding the libpq libraries.
make all gives errors:


gcc -O2 -Wall -Wmissing-prototypes -Wmissing-declarations -I../../../src/interfaces/libpq -I../../../src/include
-Wl,-rpath,/local/scratch-1/ww220/postgresql-7.1.3/lib testlibpq.c   -o testlibpq
 
testlibpq.c: In function `exit_nicely':
testlibpq.c:14: warning: implicit declaration of function `exit'
/tmp/ccNom46z.o: In function `exit_nicely':
/tmp/ccNom46z.o(.text+0xa): undefined reference to `PQfinish'
/tmp/ccNom46z.o: In function `main':
/tmp/ccNom46z.o(.text+0x3c): undefined reference to `PQsetdbLogin'
/tmp/ccNom46z.o(.text+0x48): undefined reference to `PQstatus'
/tmp/ccNom46z.o(.text+0x69): undefined reference to `PQerrorMessage'
/tmp/ccNom46z.o(.text+0x99): undefined reference to `PQexec'
/tmp/ccNom46z.o(.text+0xa3): undefined reference to `PQresultStatus'
/tmp/ccNom46z.o(.text+0xc4): undefined reference to `PQclear'
/tmp/ccNom46z.o(.text+0xd9): undefined reference to `PQclear'
/tmp/ccNom46z.o(.text+0xe8): undefined reference to `PQexec'
/tmp/ccNom46z.o(.text+0xf2): undefined reference to `PQresultStatus'
/tmp/ccNom46z.o(.text+0x113): undefined reference to `PQclear'
/tmp/ccNom46z.o(.text+0x128): undefined reference to `PQclear'
/tmp/ccNom46z.o(.text+0x137): undefined reference to `PQexec'
/tmp/ccNom46z.o(.text+0x141): undefined reference to `PQresultStatus'
/tmp/ccNom46z.o(.text+0x164): undefined reference to `PQclear'
/tmp/ccNom46z.o(.text+0x17b): undefined reference to `PQnfields'
/tmp/ccNom46z.o(.text+0x192): undefined reference to `PQfname'
/tmp/ccNom46z.o(.text+0x1cf): undefined reference to `PQgetvalue'
/tmp/ccNom46z.o(.text+0x200): undefined reference to `PQntuples'
/tmp/ccNom46z.o(.text+0x210): undefined reference to `PQclear'
/tmp/ccNom46z.o(.text+0x21f): undefined reference to `PQexec'
/tmp/ccNom46z.o(.text+0x229): undefined reference to `PQclear'
/tmp/ccNom46z.o(.text+0x238): undefined reference to `PQexec'
/tmp/ccNom46z.o(.text+0x242): undefined reference to `PQclear'
/tmp/ccNom46z.o(.text+0x24b): undefined reference to `PQfinish'
collect2: ld returned 1 exit status
make: *** [testlibpq] Error 1

Afte searching on the net, I added -lpq but the result is not positive:

gcc -O2 -Wall -Wmissing-prototypes -Wmissing-declarations -I../../../src/interfaces/libpq -I../../../src/include
testlibpq.c  -o testlibpq -lpq
 
testlibpq.c: In function `exit_nicely':
testlibpq.c:14: warning: implicit declaration of function `exit'
/usr/bin/ld: cannot find -lpq
collect2: ld returned 1 exit status

What am I missing here?


Many thanks,

Wei

Wei Wang wrote:
> Hi,
> 
> Afte searching on the net, I added -lpq but the result is not positive:
> 
> gcc -O2 -Wall -Wmissing-prototypes -Wmissing-declarations -I../../../src/interfaces/libpq -I../../../src/include
testlibpq.c  -o testlibpq -lpq
 
> testlibpq.c: In function `exit_nicely':
> testlibpq.c:14: warning: implicit declaration of function `exit'
> /usr/bin/ld: cannot find -lpq
> collect2: ld returned 1 exit status
> 
> What am I missing here?

You need to tell gcc where to find libpq.so.  You do that with the -L 
option.  So find libpq.so (I don't know where it is in the compile tree) 
and then add -L/path/to/libpq to the command.

So you might end up with something like:

gcc -I../../../src/interfaces/libpq -I../../../src/include 
-L../../../src/lib testlibpq.c -o testlibpq -lpq

Again, I don't really know where libpq.so is, so find it and substitute 
the real path for the one above.

--Jeremy

Thanks.

Yes, it works. I got rid of the -Wl and -rpath and it still works fine.

Can I include this anywhere in .bash_profile so that I don't have to include this library path everytime I compile?


On Thu, 30 May 2002 07:28:42 -0700
Jeremy Buchmann <jeremy@wellsgaming.com> wrote:

> Wei Wang wrote:
> > Hi,
> > 
> > Afte searching on the net, I added -lpq but the result is not positive:
> > 
> > gcc -O2 -Wall -Wmissing-prototypes -Wmissing-declarations -I../../../src/interfaces/libpq -I../../../src/include
testlibpq.c  -o testlibpq -lpq
 
> > testlibpq.c: In function `exit_nicely':
> > testlibpq.c:14: warning: implicit declaration of function `exit'
> > /usr/bin/ld: cannot find -lpq
> > collect2: ld returned 1 exit status
> > 
> > What am I missing here?
> 
> You need to tell gcc where to find libpq.so.  You do that with the -L 
> option.  So find libpq.so (I don't know where it is in the compile tree) 
> and then add -L/path/to/libpq to the command.
> 
> So you might end up with something like:
> 
> gcc -I../../../src/interfaces/libpq -I../../../src/include 
> -L../../../src/lib testlibpq.c -o testlibpq -lpq
> 
> Again, I don't really know where libpq.so is, so find it and substitute 
> the real path for the one above.
> 
> --Jeremy
> 
> 
> 
> 
>