'MFC header afxwin.h in a dynamic library generating link error

I'm trying to use MFC headers, such as #include <afxwin.h>, in a dynamic library project.

The structure looks like this:

Project Solution
|
|- DynamicLib
     |
     |- main.cc

main.cc contains the header.

I have the /MD compiler flag on, but the solution won't compile.

In the generated exports.def file, there's a __ DATA field that's causing the issue.

When I remove it manually, the solution compiles.

Here's the (useless) linker error:

1>exports.def : warning LNK4022: cannot find unique match for symbol '__'
1>exports.def : warning LNK4002: __@@_PchSym_@00@UwvevolknvmgUlhhprmUxnzpvUlhhprmRyfrowUlhhprmOwriUwvyftUhgwzucOlyq@4B2008FD98C1DD4 defined in MyDir.dir\Debug\stdafx.obj
1>exports.def : warning LNK4002: __@@_PchSym_@00@UzABUPdlipUDUhUrmgvinvwrzgvUexgllohUzgohOmzgrevkilqPBACIAJCBDBUlyqiUznwGEUhgwzucOlyq@4B2008FD98C1DD4 defined in d:\a01\_work\3\s\Intermediate\vctools\atls.nativeproj_1028092131\objr\amd64\stdafx.obj
1>exports.def : error LNK2001: unresolved external symbol __

Is there anything else that should be added to the compiler flags for this to be corrected?

c++visual-studiodllmfc


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