Combine Qt/Qml and bevy into one program and it cannot open bevy's App normally.

[dezbracaty]

Bevy version

in cargo.toml

bevy = { git = "https://github.com/bevyengine/bevy" ,branch= "main"}
And current version is v0.14.0-dev

[Optional] Relevant system information

Macos 15 beta2
rustc 1.79.0 (129f3b996 2024-06-10)

project address

https://github.com/dezbracaty/BevyQml

What you did

I built a program combine Qt/Qml and bevy , and I can run it normally on ubuntu system , but when run it on macos, it output a error, and I think this is a platform related problem. So I hope to know how to solve it.

What went wrong

After running App::new() .add_plugins(DefaultPlugins) .add_systems(Startup, setup) .add_systems(Update, animate_cube) .run();
It crash and output :
2024-07-02T05:56:27.686954Z INFO bevy_diagnostic::system_information_diagnostics_plugin::internal: SystemInfo { os: "MacOS 15.0 ", kernel: "24.0.0", cpu: "Apple M1 Pro", core_count: "10", memory: "16.0 GiB" } thread '<unnamed>' panicked at /Users/allen/.cargo/registry/src/index.crates.io-6f17d22bba15001f/winit-0.30.3/src/platform_impl/macos/event_loop.rs:220:13: winitrequires control over the principal class. You must create the event loop before other parts of your application initialize NSApplication note: run withRUST_BACKTRACE=1 environment variable to display a backtrace fatal runtime error: failed to initiate panic, error 5 [1] 33997 abort /Users/allen/Projects/RustProjects/BevyQml/build/bevyQml/example_qml_minimal

Additional Information

First photo is qml window,and it will call to rust function App::new() .add_plugins(DefaultPlugins) .add_systems(Startup, setup) .add_systems(Update, animate_cube) .run();
while clicking "Say HI!" button.

[alice-i-cecile]

Like the error suggests, you probably want to run Bevy headless, or otherwise without winit involved. Otherwise Qt and Winit will be fighting for control over the windowing layer. Check the custom_runner example for a starting point.