dynamic_cast an interface from a shared library which was loaded by lt_dlopen(libtool) doesn't work

Question

This is about plugin features in my program. I need a C++ class(and object) in a plugin could be used by main module through an interface. The interface inheritance like this:

Answer 1

You're problem may be the private inheritance:

_rwd_autocomplete_plugin_base_t : _rwd_plugin_base_t

Also I think because you have virtual functions your types are already polymorphic, but wouldn't hurt to add virtual destructors.

Edit: Sorry just realized you're using struct there so the default inheritance is public. But probably best to be explicit, especially since you're seeing differences between compilers.

Answer 2

you might try building with -Wl,--export-dynamic linker argument. I recall needing this argument when encountering similar behavior.