[Interest] unresolved WinMain on porting to Qt 6

[Hamish Moffatt]

I'm porting my applications to Qt6, from 5.15. Still using qmake. My 
console applications build and run fine, but my widgets applications 
fail to link with an error (Windows, VS 2022):

1>MSVCRTD.lib(exe_winmain.obj) : error LNK2019: unresolved external 
symbol WinMain referenced in function "int __cdecl invoke_main(void)" 
(?invoke_main@@YAHXZ)

I have a traditional entrypoint: int main(int argc, char* argv[]).


I see in Qt 5 there was a magic helper library qtmain, but this does not 
exist in Qt 6.

If I add the linker flag /ENTRY:mainCRTStartup then it builds. What's 
the correct Qt solution for this though?


Thanks

Hamish