2008 Jan 27 - Sun
Symbol Clash Between VC++ oledb.h and Berkeley DB db.h
When attempting to use Berkeley DB4 in a Microsoft Visual Studio 2005 C++ project, the
symbol DBTYPE is found in both Microsoft's oledb.h and Berkeley DB4's db.h. It is really
hard to get rid of oledb.h as it is buried somewhere in the depths of the stdafx.h
precompiled header file.
In one of the forums, a suggestion was made to wrap the Berkely DB4 header file db_cxx.h
in a namespace. That worked somewhat to remove the name clash, but it resulted in a link
error of not being able to find the namespaced symbol in the dll file. I wasn't sure what
was needed to resolve that bit of a naming/link-resolution problem.
Elsewhere, in another forum posting, there was a suggestion of using an #undef DBTYPE.
That didn't appear to work either. I think this is because DBTYPE is a 'typedef' rather
than a simple #define. I suppose I could have tried to change the typedef to a #define.
Instead, I made a copy of oledb.h as oledb.original.h, and modified the oledb.h file. I
changed all references of DBTYPE to MS_DBTYPE and rebuilt the project. The project compiled
and linked fine.
Of course, if I need to use oledb.h in the future, something I doubt very much, but one
never knows, I'll have to figure something out to maintain code compatibility.
I'm sure there is a more elegant solution. If someone has encountered it, please email a
solution to me and I'll post it.
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