[Bug] iOS project builds/runs OK, but outputs several duplicate class/multiple implementation warnings

[tellypresence]

First wanted to thank the team for all the work that's gone into supporting easier integration between kotlin flows and swift async code (and add that there's a good chance the problem I'm having is due to something silly in my environment, so apologies in advance if that's the case)

I followed the instructions in section Option 1: Configure KMP-NativeCoroutines. Installed dependencies for swift Core and Async products via this project using "exact version" of 1.0.0-ALPHA-44.

The iOS app builds and runs OK but leaves a lot of objc warnings in the log e.g.

objc[19614]: Class CMPViewController is implemented in both 
    /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132f810) 
and 
    /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b5073c0). 
This may cause spurious casting failures and mysterious crashes. 
One of the duplicates must be removed or renamed.

The following classes show as duplicates:

CMPViewController
CMPScreenEdgePanGestureRecognizer
CMPMetalDrawablesHandler
CMPPanGestureRecognizer
CMPEditMenuView
CMPInteropWrappingView
CMPDragInteractionProxy
CMPOSLogger
CMPHoverGestureRecognizer
CMPHoverGestureHandler
CMPGestureRecognizer
CMPAccessibilityElement
CMPOSLoggerInterval
CMPDropInteractionProxy

Click to expand "implemented in both" errors

objc[19614]: Class CMPViewController is implemented in both 
    /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132f810) 
and 
    /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b5073c0). 
This may cause spurious casting failures and mysterious crashes. 
One of the duplicates must be removed or renamed.

objc[19614]: Class CMPScreenEdgePanGestureRecognizer is implemented in both 
    /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132f860) 
and 
    /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b507410). 
This may cause spurious casting failures and mysterious crashes. 
One of the duplicates must be removed or renamed.

objc[19614]: Class CMPMetalDrawablesHandler is implemented in both 
    /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132f8b0) 
and 
    /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b507460). 
This may cause spurious casting failures and mysterious crashes. 
One of the duplicates must be removed or renamed.

objc[19614]: Class CMPPanGestureRecognizer is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132f900) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b5074b0). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPEditMenuView is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132f978) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b507528). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPInteropWrappingView is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132f9c8) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b507578). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPDragInteractionProxy is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132fa18) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b5075c8). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPOSLogger is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132fa40) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b5075f0). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPHoverGestureRecognizer is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132fa90) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b507640). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPHoverGestureHandler is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132fae0) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b507690). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPGestureRecognizer is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132fb30) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b5076e0). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPAccessibilityElement is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132fb80) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b507730). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPOSLoggerInterval is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132fbd0) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b5077d0). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

objc[19614]: Class CMPDropInteractionProxy is implemented in both /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule1.framework/myOtherModule1 (0x11132fc48) and /private/var/containers/Bundle/Application/2AEE2084-6528-4230-A230-26751FD6DBE1/myIosApp.app/Frameworks/myOtherModule2.framework/myOtherModule2 (0x10b507848). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed.

Also seeing 4 "has multiple implementations" warnings:

Class SkikoUIView has multiple implementations. Which one will be used is undefined.
Class AccessibilityRoot has multiple implementations. Which one will be used is undefined.
Class AccessibilityElement has multiple implementations. Which one will be used is undefined.
Class ComposeHostingViewController has multiple implementations. Which one will be used is undefined.

Any insight or suggestions appreciated, thank you

[rickclephas]

Hey! It sounds like your iOS app depends on multiple shared Kotlin modules using Compose Multiplatform.
Could you share some more information about your project setup?