how to build plugin dll separately in linux ENV

edit

I have built wireshark and all plugins with source code according to official guide, and it works well in window 10.

Now I have two question:

1. I add a folder foo in epan and add some implementation in it. Could I just build it to foo.dll without building whole wireshark project, it seems with some necessary dependency headers(some are generated in the first time when building whole wireshark project), it should be possible to build separately, could anyone provide this separate sub-project? some build advice?

2. could it be built to foo.dll separately(with some necessary headers) with cross-compiler in linux env? how to build it? and then when replacing it in windows 10, it could run normally.

Thanks for your help and comment in advance.