Re: c++ compile/link problem

On Thu, 29 Mar 2001, Shane Hansen wrote:

> I am struggling trying to get a connection to my postgres database from a c++ program. I have read the documention and looked at many examples, but when I try to compile the code I get the same type errors every time. They look like:
>
> /tmp/cc38u8Jz.o: In function `main':
> /tmp/cc38u8Jz.o(.text+0x3b): undefined reference to `PgConnection::PgConnection(
> char const *)'
> /tmp/cc38u8Jz.o(.text+0x4e): undefined reference to `PgConnection::~PgConnection
> (void)'
> collect2: ld returned 1 exit status
>
> What am I doing wrong?

I'm assuming you've remembered to link to libpq++ here.

This may be a problem with your C++ compiler. Different compilers, and in some
cases even different versions of the same compiler, mangle C++ identifiers
differently so they won't link to each other's code (and before you ask: yes,
there are good reasons for this--see the C++ FAQ :-).

Have you made sure your version of libpq++ was build with the same compiler?

Jeroen