Re: Linking in libpgm

[Paul Pluzhnikov]

"Dave Rudolf" <nuclearwhippingboy@hotmail.com> writes:

> I am trying to use libpgm and libpbm into a C++ program, but I get the
> following at link time:
> 
>   : undefined reference to `pm_freearray(char**, int)'

The C++ name mangling has got you. 
The prototypes for the pm_openr() etc. are missing the 'extern "C"' prefix.

> So is there some reason why the linker gets confused on these libs?

The linker is not confused. It is simply looking for
"pm_freearray__FPPci" or "_Z12pm_freearrayPPci" instead of
"pm_freearray" that it should be looking for (use "nm" to verify
that).

The problem is in your source (or in libpbm header file).

> I should be able to use raw C libraries in my C++ code, should I not?

Yes, that works just fine.

> If so, then can anyone tell me what is going on here?

Since /usr/include/pbm.h (on my system, and probably on yours)
doesn't have 'extern "C"' guards, you must include it like this:

extern "C" {
#include <pbm.h>
}

Cheers,
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