errors.hlp (Topic list)
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Error Message
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     Compiler warning (level 1) C4005
 
     'identifier' : macro redefinition
 
     The given identifier was defined twice. The compiler assumed the
     new macro definition.
 
     To eliminate the warning, either remove one of the definitions or
     use an #undef directive before the second definition.
 
     This warning is caused in situations where a macro is defined both
     on the command line and in the code with a #define directive.
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