Why does my C++/WinRT project get errors of the form “Unresolved external symbol void* __cdecl winrt_make_YourNamespace_YourClass(void)“?

So your C++/WinRT project gets build failures of the form unresolved external symbol "void * __cdecl winrt_make_YourNamespace_YourClass(void)" (?winrt_make_YourNamespace_YourClass@YAPAXXZ) referenced in function void * __stdcall winrt_get_activation_factory(class std::basic_string_view<wchar_t, struct std::char_traits<wchar_t> > const &)" (?winrt_get_activation_factory@@YGPAXABV?$basic_string_view@_WU?$char_traits@_W@std@@@std@@@Z) What’s going on, and how do you fix it? The post Why does my C+...

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