Bug UNITY_XR_ARKIT_LOADER_ENABLED removing itself from scriptingDefineSymbols

This issue just appeared this week. The scriptingDefineSymbol UNITY_XR_ARKIT_LOADER_ENABLED, which is necessary for ARKIT to work, somehow gets removed from the Scripting Define Symbols list in player settings. I add it, and a few builds later it has disappeared again. This is very frustrating. Anyone knows what might be causing it?

 

Did some further probing: UNITY_XR_ARKIT_LOADER_ENABLED gets removed when switching from iOS to Desktop build target. This change is then included when changes are pushed to Collaborate, reflecting it on all other users.

Still very annoying but now we know how to avoid it.

 

Can confirm - just discovered the same bug and used half a day debugging until I compared player settings with a previous project to find this issue. Why is this define needed?!

 

It doesn't always return though, quite often I need to manually put it back after switching to iOS.

 

Same here. It doesn't work when switching the platform via scripting, e.g. on automated builds. It feels like Unity is hacking its own Build Pipeline, but doesn't do it properly.

l don't really understand why the define needs to be removed anyway when switching between platforms. Each platform has its own defines. Why remove a define for iOS when I switch to Android where the define is already not set?

 

@TreyK-47 Is it possible to get any update on this matter?

 

Yeah, no, this doesn't work properly at all. I've wasted the whole day on this issue. ARKitBuildProcessor doesn't correctly re-add the symbol if switching to a branch where this wasn't on and looking at the code it seems really rather fragile. UpdateARKitDefines() really should be done in OnPreprocessBuild and instead that doesn't even run if UNITY_XR_ARKIT_LOADER_ENABLED is not already enabled.

 

Please vote for this bug report:
https://issuetracker.unity3d.com/is...ed-and-unity-editor-build-target-is-not-set-t