C/C++ Compiler (cl.hlp) (Table of Contents; Topic list)
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C4507
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     Compiler warning (level 4) C4507
 
     explicit linkage specified after default linkage was used
 
     After an identifier was declared with the default C++ linkage,
     it was explicitly declared as having C++ linkage.
 
     The following code generates this warning:
 
          void   WhereProhibited( void );
          extern "C++" { void   WhereProhibited( void ); };  //Warning
                                    -♦-