[Interest] unresolved WinMain on porting to Qt 6

[Henry Skoglund]

On 2023-06-23 07:15, Hamish Moffatt via Interest wrote:
> 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?
>

The fact that adding /ENTRY:mainCRTStartup helped implies that you're 
linking with /SUBSYSTEM:CONSOLE and not /SUBSYSTEM:WINDOWS, i.e. 
defaulting to console flavor.
Maybe you forgot "QT += widgets" in the .pro file (just guessing :-)