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How to identify a diagnostic


When the compiler runs with the correct combination of options, any
  message it issues beginning with the words Fatal, Error, or Warning
  are diagnostics in the sense that ANSI specifies. The options needed
  to insure this interpretation are in the following table. The options are
  listed as hot keys you use in the IDE. For example, the first option
  corresponds to Options|Compiler|Source, and in the Source Options
  dialog box you'd choose ANSI for the Keyword option.

  -----------------------------------------------------------------------------
  Option       Action
  -----------------------------------------------------------------------------
  O|C|S|A      Enable only ANSI keywords.
  O|C|S|N      No nested comments allowed.
  O|C|E|C      Use C calling conventions.
  O|C|S|I      At least 32 significant characters in identifiers.
  O|C|M|D|S    Turn off all warnings except selected ones.
  O|C|M|A|I    Turn on warning about inappropriate initializers.
  O|C|M|P|C    Turn on warning about non-portable pointer comparisons.
  O|C|M|A|R    Turn on warning about duplicate non-identical definitions.
  O|C|M|A|S    Turn on warning about suspicious pointer conversion.
  O|C|P|N      Turn on warning about non-portable pointer conversion.
  O|C|M|A|V    Turn on warning about void functions returning a value.
  O|C|M|A|H    Turn on warning about hexadecimal values containg more than
               3 digits.
  O|C|M|P|M    Turn on warning about mixing pointers to signed and unsigned
               char.
  O|C|M|A|U    Turn on warning about undefined structures.
  O|C|M|A|X    Turn on warning about variables declared both as external and
               as static.
  -----------------------------------------------------------------------------
  Choose Options|Compiler|Code Generation and specify Never under SS = DS.
  Also don't change the default values in the Segment Names dialog box under
  Options|Compiler|Names; each text box should contain an asterisk (*).

  Other options not specifically mentioned here can be set to whatever
  you desire.
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