fix: OpenXR is not available on iOS

[leanmendoza]

What?

Add OpenXR to exclusion list when it's building for iOS

Why?

gdext is not being able to load on iOS because is trying to load OpenXR which is not available there.

2024-03-01 15:22:11.208723-0800 GodotProject[5232:98778] USER ERROR: Parameter "mb" is null.
2024-03-01 15:22:11.208772-0800 GodotProject[5232:98778]    at: gdextension_classdb_get_method_bind (core/extension/gdextension_interface.cpp:1347)
USER ERROR: Parameter "mb" is null.
   at: gdextension_classdb_get_method_bind (core/extension/gdextension_interface.cpp:1347)
2024-03-01 15:22:11.210251-0800 GodotProject[5232:98778] USER ERROR: Rust function panicked in file /Users/user/.cargo/git/checkouts/gdext-76630c89719e160c/5e18af8/godot-ffi/src/toolbox.rs at line 249. Context: failed to initialize GDExtension level `Scene`
2024-03-01 15:22:11.210272-0800 GodotProject[5232:98778]    at: <function unset> (/Users/user/.cargo/git/checkouts/gdext-76630c89719e160c/5e18af8/godot-core/src/lib.rs:161)
USER ERROR: Rust function panicked in file /Users/user/.cargo/git/checkouts/gdext-76630c89719e160c/5e18af8/godot-ffi/src/toolbox.rs at line 249. Context: failed to initialize GDExtension level `Scene`
   at: <function unset> (/Users/user/.cargo/git/checkouts/gdext-76630c89719e160c/5e18af8/godot-core/src/lib.rs:161)
2024-03-01 15:22:11.210291-0800 GodotProject[5232:98778] USER ERROR: Panic msg:
  Failed to load class method OpenXRAPIExtension::get_instance (hash 2455072627).
  Make sure gdext and Godot are compatible: https://godot-rust.github.io/book/gdext/advanced/compatibility.html
2024-03-01 15:22:11.210300-0800 GodotProject[5232:98778]    at: <function unset> (/Users/user/.cargo/git/checkouts/gdext-76630c89719e160c/5e18af8/godot-core/src/lib.rs:107)
USER ERROR: Panic msg:
  Failed to load class method OpenXRAPIExtension::get_instance (hash 2455072627).
  Make sure gdext and Godot are compatible: https://godot-rust.github.io/book/gdext/advanced/compatibility.html
   at: <function unset> (/Users/user/.cargo/git/checkouts/gdext-76630c89719e160c/5e18af8/godot-core/src/lib.rs:107)

[GodotRust]

API docs are being generated and will be shortly available at: https://godot-rust.github.io/docs/gdext/pr-639

[Bromeon]

Thanks a lot!

Btw, did you take any extra steps to make gdext work on iOS? If yes, a short comment on #498 would be appreciated! 🙂

[jeyum2]

When building on macOS with godot crate, the target_os is still recognized as ‘macos’.
( ‘cargo build –target=aarch64-apple-ios’ )
I suspect it is on the [build-dependencies] in the toolchain.
If so, we need to find an alternative solution.

[Bromeon]

Thanks for reporting!

As I don't have macOS hardware myself, would it be possible for you to adjust the condition to something that detects it correctly, and maybe submit a PR? 🙂

[jeyum2]

With #781, I can run iOS project with export_template on iPhone device

[Bromeon]

Awesome, thanks a lot ❤️