Quote Originally Posted by jwintz
To add in the application project file instead of the plugin project file as I tried before.
Yes, of course I forgot to mention that. It is the main application which has to export the symbols so that plugins can resolve them.

Unfortunately, solutions like those mentioned in this thread are not available on Windows.

Another way to achieve the same (a way which should work on all platforms) is to export all the functionality the plugins use to an external library and link (dynamically) both plugins and the main application with it. This way all symbols will be resolved from the shared object without any special tricks.