CMAKE_MFC_FLAG

Tell cmake to use MFC for an executable or dll.

This can be set in a CMakeLists.txt file and will enable MFC in the application. It should be set to 1 for the static MFC library, and 2 for the shared MFC library. This is used in Visual Studio 6 and 7 project files. The CMakeSetup dialog used MFC and the CMakeLists.txt looks like this:

add_definitions(-D_AFXDLL)
set(CMAKE_MFC_FLAG 2)
add_executable(CMakeSetup WIN32 ${SRCS})

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https://cmake.org/cmake/help/v3.5/variable/CMAKE_MFC_FLAG.html