[mingw] Exception thrown when closing app

[RichardLuo0]

I am trying to build https://github.com/driver1998/WinUI-MinGW. However, I get an exception when closing the app (e.g., clicking the close button at the top right). I have no idea how to fix this, it looks like it is thrown from system dll. Other than this everything works fine.
The compiled result: bin.zip

[DarranRowe]

If you look at the function, it is quite clearly stating RtlValidateHeap. Now, consider all of the ways your application can corrupt the heap. In other words, the system isn't necessarily responsible for a bug just because it is reported from a system library. In fact I would guess that the screenshot containing the text

"HEAP: Free Heap block 00000263F55E5380 modified at 00000263F55E5488 after it was freed"

would indicate that this is a use after free bug.

The code linked also works in Visual C++ without failing. So I would suggest checking the GCC command line, especially opting into thread safe initialisation if it doesn't do that already.

[RichardLuo0]

I am using the makefile from that project with little modifications to fit my environment (header path etc). I am using clang and mingw from msys2. I don't think I have set anything related to thread safety.

[DarranRowe]

One of the biggest difficulties here is that the only supported way of creating Xaml applications is through the templates that come as part of Visual Studio, and Visual C++ is the only supported compiler. This means that if you wish to use tooling or templates outside of the supported ones, then you need to support yourself.

That being said, besides the use after free, the templates provided by Visual Studio don't produce the RPC_E_WRONG_THREAD error either. So maybe that sample is doing something problematic and it results in a crash. Either way, you should be contacting the author of the sample for support first.