BUG: C2374 in OLECTLID.H When Rebuilding DBDAO3.DLL for VC 4.2

• The DAO SDK, included with: - Microsoft Visual C++, 32-bit Edition, version 4.2

SYMPTOMS

When rebuilding the DAO SDK that ships with Visual C++ 4.2, you will receive numerous C2374 errors compiling the DBDAO.CPP file:

   C:\MSDEV\INCLUDE\OLECTLID.H(17) : error C2374:
   '<Interface>' : redefinition; multiple initialization

CAUSE

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.

RESOLUTION

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 )

STATUS