C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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Predefined Identifiers
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   The following identifiers may be predefined by the compiler for
   testing and other uses in preprocessor statements:
 
 __cplusplus        _M_I86      _M_I386     _QC
  _CHAR_UNSIGNED    _M_I86mM    _MSC_VER    __STDC__
  _DLL              _M_I8086    _MSDOS      _WINDLL
  _FAST             _M_I286     _PCODE_     _WINDOWS
 
   The following predefined identifiers are supported for compatibility
   with previous versions of Microsoft C:
 
   M_I86       M_I8086     M_I386
   M_I86mM     M_I286      MSDOS
 
   See also: ◄Predefined ANSI Macros►
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