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

 Message        The level set by a #pragma optimize directive must be
                between 0 and 5.  Pragma is ignored.

 Description    A #pragma optimize has tried to set the optimization
                level to a value outside the valid range.  The
                compiler will ignore the directive.

 User Action    Set the optimization level to a number from 0 to 5.