'warning: unused parameter'

I've succeeded in setting up a MinGW64 environment. It's quite nice once
you get past the tools install issues. I have not committed
INSTALL_windows_mingw64.txt yet; soon.

I'm getting lots of 'warning: unused parameter' messages from g++:

../monotone/src/simplestring_xform.hh:51:61: warning: unused parameter 'thing' [-Wunused-parameter]
 origin::type get_made_from<std::string>(std::string const & thing)
                                                             ^

The code that generates this is in simplestring_xform.hh:

template<> inline
origin::type get_made_from<std::string>(std::string const & thing)
{
  return origin::internal;
}

Is there a way to mark 'thing' as unused? or do we have to disable that
warning with -Wno-unused-parameter?

-- 
-- Stephe