Build an executable with a WinMain entry point on windows.
When this property is set to true the executable when linked on Windows will be created with a WinMain() entry point instead of just main(). This makes it a GUI executable instead of a console application. See the CMAKE_MFC_FLAG variable documentation to configure use of MFC for WinMain executables. This property is initialized by the value of the variable CMAKE_WIN32_EXECUTABLE if it is set when a target is created.
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https://cmake.org/cmake/help/v3.7/prop_tgt/WIN32_EXECUTABLE.html