I am trying to upgrade my Qt-project settings from Visual Studio 2013 to 2015. It almost done but I get some errors with qtmaind.lib.
1>qtmaind.lib(qtmain_winrt.obj) : error LNK2019: unresolved external symbol imp__RoInitialize@4 referenced in function _WinMain@16 1>qtmaind.lib(qtmain_winrt.obj) : error LNK2019: unresolved external symbol __imp__RoGetActivationFactory@12 referenced in function "public: __thiscall AppContainer::AppContainer(void)" (??0AppContainer@@QAE@XZ) 1>qtmaind.lib(qtmain_winrt.obj) : error LNK2019: unresolved external symbol _WindowsCreateStringReference@16 referenced in function "private: void __thiscall Microsoft::WRL::Wrappers::HStringReference::CreateReference(wchar_t const *,unsigned int,unsigned int)" (?CreateReference@HStringReference@Wrappers@WRL@Microsoft@@AAEXPB_WII@Z) 1>qtmaind.lib(qtmain_winrt.obj) : error LNK2019: unresolved external symbol _WindowsDeleteString@4 referenced in function "public: void __thiscall Microsoft::WRL::Wrappers::HString::Release(void)" (?Release@HString@Wrappers@WRL@Microsoft@@QAEXXZ) 1>qtmaind.lib(qtmain_winrt.obj) : error LNK2019: unresolved external symbol _WindowsGetStringRawBuffer@8 referenced in function "public: wchar_t const * __thiscall Microsoft::WRL::Wrappers::HString::GetRawBuffer(unsigned int *)const " (?GetRawBuffer@HString@Wrappers@WRL@Microsoft@@QBEPB_WPAI@Z) 1>qtmaind.lib(qtmain_winrt.obj) : error LNK2019: unresolved external symbol _RoOriginateError@8 referenced in function "public: static void __cdecl Microsoft::WRL::ErrorHelper<0>::OriginateError(long,struct HSTRING *)" (?OriginateError@?$ErrorHelper@$0A@@WRL@Microsoft@@SAXJPAUHSTRING__@@@Z)
Qt 5.6-rc (22-Feb-2016 15:11)
link to WindowsApp.lib. That should resolve your issues.