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

 Message        The _FASTMATH version of this function has been
                specified, but _FASTMATH routines do not support the
                IEEE behaviors requested and will simply trap and
                terminate when given arguments or computing values
                outside the normal range.

 Description    The compiler has recognized a math intrinsic function
                that has a _FASTMATH version and the compilation has
                defined the macro _FASTMATH, but command line options
                have also specified IEEE trapping behaviors other
                than the default of flushing underflow to zero and
                aborting on all others.

 User Action    If the body of your code relies on IEEE denormals,
                infinities, or nans, but is careful to condition the
                arguments to math library functions to avoid passing
                or computing these values, you may ignore or suppress
                this warning.  Otherwise, you should either remove
                the options specifying non-default IEEE behavior or
                else undefine the _FASTMATH macro.