VMS Help UIL, /WARNINGS[=(msg_type,...)]  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Negative form:  /NOWARNINGS

  Controls  whether  the  compiler  prints  messages  for   diagnostic
  warnings.

    You can specify one or both of the following for msg_type:

    NOINFORMATIONALS  Do not print informational messages
    NOWARNINGS        Do not print warning messages

  The default is to print  both  informational  and  warning  messages
  (/WARNINGS).