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

  /[NO]DEBUG[=(option[,...])]     D=/DEBUG=(PARAM=USED,NOSYMBOLS,TRACEBACK)

  Controls whether the compiler makes local symbol table and
  traceback information available to the debugger and the run-time
  error traceback mechanism, and whether the debugger is given
  information about all PARAMETER constants defined in the program
  unit or only those that are actually used.

  By default, if you omit the /DEBUG qualifier, the compiler produces
  only an address correlation table (equivalent to
  /DEBUG=(PARAMETERS=USED,NOSYMBOLS,TRACEBACK)).  If you specify
  /DEBUG without any options, the default is
  /DEBUG=(PARAMETERS=USED,SYMBOLS,TRACEBACK).  /DEBUG=ALL is
  equivalent to /DEBUG=(PARAMETERS=ALL,SYMBOLS,TRACEBACK.)

  Compaq recommends that /NOOPTIMIZE also be used when debugging
  Fortran programs.  Optimizations performed by the compiler can
  cause several different kinds of unexpected behavior when using the
  OpenVMS Debugger.  See your performance guide for more information
  on this subject.

  The compiler will issue an informational message recommending
  /NOOPTIMIZE if /DEBUG is used without the /NOOPTIMIZE qualifier.
  To disable this message, specify /OPTIMIZE explicitly.

  For details on how to debug a Compaq Fortran 77 program with the
  OpenVMS Symbolic Debugger, see your user manual.

  /NODEBUG is equivalent to /DEBUG=NONE.

  Additional Information (explode) :

• PARAMETERS
• SYMBOLS
• TRACEBACK
• ALL
• NONE