workaround gcc's unused-but-set-variable warnings.
workaround gcc's unused-but-set-variable warnings.

nanodbc/nanodbc,mcg1969/nanodbc,nanodbc/nanodbc,norsync/nanodbc,ChrisBFX/nanodbc,norsync/nanodbc,ChrisBFX/nanodbc,mcg1969/nanodbc