When rebuilding the DAO SDK that ships with Visual C++ 4.2, you will receive numerous C2374 errors compiling the DBDAO.CPP file: where <Interface> is a number of OLE interfaces defined within OLECTLID.H.

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The \MSDEV\DAOSDK\SRC\STDAFX.H file that ships with the DAO SDK is incorrect. When rebuilding the DAO SDK DLL's, DBDAO.CPP includes its own STDAFX.H, which also includes AFXDISP.H and OLECTLID.H. However, AFXDISP.H has already included OLECTLID.H, creating the redefinition.

NOTE: This issue only occurs when recompiling the DAO SDK, and not when using the DAO SDK in a separate application. DBDAO.CPP is the only file that would include \MSDEV\DAOSDK\SRC\STDAFX.H that has the multiple include in it.

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Edit the \MSDEV\DAOSDK\SRC\STDAFX.H file to remove the explicit reference to OLECTLID.H. The final version of the file should look like this:

  // stdafx.h : include file for standard system include files,
   //  or project specific include files that are used frequently, but
   //      are changed infrequently
   // 
   #define INITGUID TRUE
   #include <afxdisp.h>        // MFC OLE automation classes
   #include <CGUID.H>

   #define DLLEXPORT   __declspec( dllexport )
				

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Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

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