VMS Help CC, Messages, NOMAINUFLO  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        No main function encountered within module.
                /IEEE_MODE=UNDERFLOW_TO_ZERO is ignored.

 Description    Use of the /IEEE_MODE=UNDERFLOW_TO_ZERO is only
                meaningful for compilation units that contain a main
                program.  The compiler will ignore the qualifier.

 User Action    Remove the qualifier from the command line.