Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     The compiler defines six identifiers that are useful in writing
     portable programs. You can use these identifiers to compile code
     sections conditionally, depending on the processor and operating
     system being used. The predefined identifiers and their functions
     are listed below:
 
     Identifier         Function
 
     MSDOS              Always defined. Identifies target operating
                        system as MS-DOS.
 
     M_I86              Always defined. Identifies target machine as a
                        member of the I86 family.
 
     M_I86mM            Always defined. Identifies memory model, where
                        'm' is either S (small model), C (compact
                        model), M (medium model), L (large model), or
                        H (huge model). If huge model is used, both
                        M_I86LM and M_I86HM are defined. Small model
                        is the default.
 
     NO_EXT_KEYS        Defined only when the /Za option is given, thus
                        disabling Microsoft-specific language
                        extensions and extended keywords.
 
     _CHAR_UNSIGNED     Defined only when the /J option is given to
                        make the char type unsigned by default.
                                    -♦-