/NODEBUG

  Controls whether the compiler generates information for  use  by
  the  VMS  Debugger  and  the run-time error traceback mechanism.
  The available options are:

     ALL
       Specifies that the compiler should include symbol and traceback
       information in the object module.

     NONE
       Symbol and traceback information will not be included in the
       object module.

     [NO]SYMBOLS
       Specifies that the compiler should include in the object module
       symbol definitions for all identifiers in the compilation.

     [NO]TRACEBACK
       Specifies that the compiler should include in the object module
       traceback information permitting virtual addresses to be
       translated into source program routine names and compiler-
       generated line numbers.

  When  you  specify  SYMBOLS  without  TRACEBACK,  the  table  of
  compiler-generated  line  numbers  is  omitted from the debugger
  symbol file.

  You should consider using /NOOPTIMIZE when you are using /DEBUG.
  Allowing  optimizations  to occur might make debugging difficult
  and might obsucre some sections of the compilation unit that you
  want to debug.

  /DEBUG=TRACEBACK is enabled by default.   The  /DEBUG  qualifier
  without  options  is  equivalent  to  /DEBUG=ALL.   The /NODEBUG
  qualifier is equivalent to /DEBUG=NONE.