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

     /NOCROSS_REFERENCE (D)

  Specifies whether the compiler generates cross-references.  If you
  specify /CROSS_REFERENCE, the compiler lists, for each variable
  referenced in the procedure, the line numbers of the lines on which
  the variable is referenced.  You must use the /CROSS_REFERENCE
  qualifier with either the /SHOW=SYMBOLS or the /SHOW=BRIEF
  qualifiers.  To obtain any type of listing, you must specify /LIST.