How can I convert libstdc++.a to libstdc++.dll?

I have tried Paul Sokolovsky a2dll script ( http://sourceforge.net/projects/mingwrep/ )but when linking my code I get a huge mountain of unresolved symbols.

Paul says that I've got to find all the symbols in the *.h files and prepend "dllimport". Is that true? I can't believe it!

Any help?