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 :-)

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