I have install postgresql 7.3.4. I want to use C++ program to update my
database.

I link my program with this link option L/usr/local/pgsql/lib.

The program is linked, but when I run it.

I have this problem

My_program: error while loading shared libraries: libpq.so.3: cannot open
shared object file: No such file or directory.

The link libpq.so.3 is the right directory /usr/local/pgsql/lib and its
linked to libpq.so.3.0.

What happening?

 

Thanks.

 

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Mon, 20 Oct 2003 10:12:28 +0200
"Fabien DAUMEN" <fdaumen@technodiva.com>
Can't not load libpq.so.3
On Mon, Oct 20, 2003 at 10:12:28AM +0200, Fabien DAUMEN wrote:
> 
> I link my program with this link option ?L/usr/local/pgsql/lib.
 
That's good, but it only deals with the compile-time linking.  The
actual loading of a shared library happens at run-time, and since there's
no special reason to assume that the running system will look like the
one you compiled your code on, this library path is not remembered.

So libpq needs to be in your library *load* path as well as your library
*link* path, which you set correctly.

Two workarounds suggest themselves:

1. Make sure your OS can find the library at load time.  On Linux for
example, you'd do this by setting the environment variable LD_LIBRARY_PATH
to include the path /usr/local/pgsql/lib before running your program.

2. Alternatively, create a link to libpq.so somewhere in your existing 
library load path so your system knows where to find it by default.  You
could call it /usr/local/lib/libpq.so, for instance.


Jeroen


Fri, 24 Oct 2003 18:41:31 +0200
"Jeroen T. Vermeulen" <jtv@xs4all.nl>
Re: Can't not load libpq.so.3