This is using:
**Unity 6000.2.7f - latest ARKit etc Xcode 26.1 **
This is going to iPad/iPhone/iOS and I have succesfully built to the iPad before, but updates to the software seem to have added these errors in.
Basically all updated as much as possible.
Originally I got 5 errors, but updates brought it down.
On build I now get 3 undefined symbols:
Undefined symbol: _swift_FORCE_LOAD$_swiftCompatibility51
Undefined symbol: _swift_FORCE_LOAD$_swiftCompatibility56
Undefined symbol: _swift_FORCE_LOAD$_swiftCompatibilityConcurrency
This appears to be a bug, or issue, that is in some way known, but I'm not sure how best to get past it.
ld: warning: search path '/var/run/com.apple.security.cryptexd/mnt/com.apple.MobileAsset.MetalToolchain-v17.1.324.0.kGuqPt/Metal.xctoolchain/usr/lib/swift/iphoneos' not found ld: warning: search path '/var/run/com.apple.security.cryptexd/mnt/com.apple.MobileAsset.MetalToolchain-v17.1.324.0.kGuqPt/Metal.xctoolchain/usr/lib/swift-5.0/iphoneos' not found ld: warning: Could not find or use auto-linked library 'swiftCompatibility51': library 'swiftCompatibility51' not found ld: warning: Could not find or use auto-linked library 'swiftCompatibility56': library 'swiftCompatibility56' not found ld: warning: Could not find or use auto-linked library 'swiftCompatibilityConcurrency': library 'swiftCompatibilityConcurrency' not found ld: warning: Could not find or use auto-linked library 'swiftCompatibilityPacks': library 'swiftCompatibilityPacks' not found ld: warning: Could not find or use auto-linked framework 'CoreAudioTypes': framework 'CoreAudioTypes' not found ld: warning: Could not find or use auto-linked framework 'UIUtilities': framework 'UIUtilities' not found ld: warning: Could not parse or use implicit file '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/SwiftUICore.framework/SwiftUICore.tbd': cannot link directly with 'SwiftUICore' because product being built is not an allowed client of it Undefined symbols for architecture arm64: "_swift_FORCE_LOAD$_swiftCompatibility51", referenced from: _swift_FORCE_LOAD$swiftCompatibility51$_UnityARKit in libUnityARKit.a[49](RoomCaptureSessionWrapper. o) "_swift_FORCE_LOAD$_swiftCompatibility56", referenced from: _swift_FORCE_LOAD$swiftCompatibility56$_UnityARKit in libUnityARKit.a[49](RoomCaptureSessionWrapper. o) "_swift_FORCE_LOAD$_swiftCompatibilityConcurrency", referenced from: _swift_FORCE_LOAD$swiftCompatibilityConcurrency$_UnityARKit in libUnityARKit.a[49](RoomCaptureSessionWrapper. o) ld: symbol(s) not found for architecture arm64 clang++: error: linker command failed with exit code 1 (use -v to see invocation)