warning: C:\cb_svn\trunk\src\include/sdk.h.gch: not used because `wxPG_USE_WXMODULE' not defined
You can ignore this warning the errors and warning on CB startup you need to fix.
What version of the Code::Blocks SDK are you using?
What version of Code::Blocks are you trying to use the Plug-In with?
The above two version not being the same causes the message you linked to pop up.
The wx library link issue has multiple fixes depending on what you are trying to do.
Tim S.