I think you need to use Pd's c_externdir method to determine the extern's path. This is basicaly how I opened a .so in an external:

void *my_extern_tilde_new(t_symbol *s, int argc, t_atom *argv)
{
  // creates the object
  t_my_extern *x = (t_my_extern *)pd_new(my_extern_class);

  // using Pd's open_via_path to find myextern, and from there my_other_lib.so
  char *externdir = myextern_class->c_externdir->s_name;
   x->my_other_lib = dlopen(externdir,  RTLD_NOW | RTLD_LOCAL);
...

Joel

On 01/09/2015 03:34 PM, David Medine wrote:
I am writing an extern that uses a 3rd party shared object library. I keep getting a
"cannot open shared object file: No such file or directory"
posted to the Pd console when I load the extern. The library is linking properly in my makefile (as far as I can tell) and the .so file that I want the extern to load is in the same folder as the extern. I have also put the path to the unfound library in Pd's path list.

I have also compiled a different, plain old dylib/shared object/dll using this very same library for use in python and it works perfectly. I've also written C and C++ programs that link to this library at run time and they work perfectly too. Does anybody have any idea why Pd hates it?

I have also done dynamic loading successfully in a Pd extern using the sphinx library. The only difference there was that there the sphinx libraries were installed in a standard library directory (ie /usr/lib or something like that) . I can't try to do this right now because I don't have su rights on the computer I am using. My understanding, though, is that linux should be searching for dynamic libraries in the directory that the parent application is in. So I also tried putting my unfound library in pd-0-whatever/bin. No joy.

I have tried compiling using gcc and g++ on linux. I've also tried to link with those compilers as well as ld (which is called by those compilers if you link with them). I haven't tried any other OSs yet.

Thanks in advance,
David

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