C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
Output-File Restrictions
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─────C/C++ Compiler─────────────────────────────────────────────────────────
 
     The compiler reserves certain naming conventions for its internal
     use. Avoid the following:
 
        ■ Names that begin with more than one underscore, for example,
          __chkstk
 
        ■ Global names that begin with two underscores, for example,
          __open
 
        ■ Names that end with the suffix QQ
                                    -♦-