Generating shared objects with gpc

Hi gpc crew, Is there a way to generate a shared object (.so) under unix with gpc? I found nothing about this in GPC documentation. I tried "gpc --automake -o foo.so foo.pas" on the command line (foo.pas being a module) This does not work: I get an error about an undefined reference to 'main' Is it possible at all to generate a shared object with gpc? Does someone have any clue? Regards Pascal Viandier