Duplicate symbol error on iOS

[Th3L0x]

/usr/local/share/dotnet/packs/Microsoft.iOS.Sdk.net9.0_18.0/18.0.9617/targets/Xamarin.Shared.Sdk.targets(1663,3): error :
clang++ exited with code 1:
duplicate symbol 'OBJC_IVAR$_Rect2d.native' in:
/Users/martinbozso/.nuget/packages/mediapipetaskscommon.ios/0.10.18/lib/net8.0-ios18.0/MediaPipeTasksCommon.resour
ces/MediaPipeTasksCommon.xcframework/ios-arm64/MediaPipeTasksCommon.framework/MediaPipeTasksCommon1499
/Users/martinbozso/.nuget/packages/opencvsdk.ios/4.10.0.1/lib/net8.0-ios17.5/OpenCvSdk.iOS.resources/opencv2.frame
work/opencv2[arm64]1041
duplicate symbol 'OBJC_IVAR$_MinMaxLocResult._minLoc' in:
/Users/martinbozso/.nuget/packages/mediapipetaskscommon.ios/0.10.18/lib/net8.0-ios18.0/MediaPipeTasksCommon.resour
ces/MediaPipeTasksCommon.xcframework/ios-arm64/MediaPipeTasksCommon.framework/MediaPipeTasksCommon[1491](MinMaxLocResu
lt.o)
/Users/martinbozso/.nuget/packages/opencvsdk.ios/4.10.0.1/lib/net8.0-ios17.5/OpenCvSdk.iOS.resources/opencv2.frame
work/opencv2[arm64]1033
duplicate symbol 'OBJC_CLASS$_Size2i' in:
/Users/martinbozso/.nuget/packages/mediapipetaskscommon.ios/0.10.18/lib/net8.0-ios18.0/MediaPipeTasksCommon.resour
ces/MediaPipeTasksCommon.xcframework/ios-arm64/MediaPipeTasksCommon.framework/MediaPipeTasksCommon1506
/Users/martinbozso/.nuget/packages/opencvsdk.ios/4.10.0.1/lib/net8.0-ios17.5/OpenCvSdk.iOS.resources/opencv2.frame
work/opencv2[arm64]1048
duplicate symbol 'OBJC_CLASS$_Converters' in:
/Users/martinbozso/.nuget/packages/mediapipetaskscommon.ios/0.10.18/lib/net8.0-ios18.0/MediaPipeTasksCommon.resour
ces/MediaPipeTasksCommon.xcframework/ios-arm64/MediaPipeTasksCommon.framework/MediaPipeTasksCommon1461
/Users/martinbozso/.nuget/packages/opencvsdk.ios/4.10.0.1/lib/net8.0-ios17.5/OpenCvSdk.iOS.resources/opencv2.frame
work/opencv2[arm64]1003
duplicate symbol 'OBJC_CLASS$_RotatedRect' in:
/Users/martinbozso/.nuget/packages/mediapipetaskscommon.ios/0.10.18/lib/net8.0-ios18.0/MediaPipeTasksCommon.resour
ces/MediaPipeTasksCommon.xcframework/ios-arm64/MediaPipeTasksCommon.framework/MediaPipeTasksCommon1502
/Users/martinbozso/.nuget/packages/opencvsdk.ios/4.10.0.1/lib/net8.0-ios17.5/OpenCvSdk.iOS.resources/opencv2.frame
work/opencv2[arm64]1044
/Users/martinbozso/.nuget/packages/mediapipetaskscommon.ios/0.10.18/lib/net8.0-ios18.0/MediaPipeTasksCommon.resour
ces/MediaPipeTasksCommon.xcframework/ios-arm64/MediaPipeTasksCommon.framework/MediaPipeTasksCommon1150
/Users/martinbozso/.nuget/packages/opencvsdk.ios/4.10.0.1/lib/net8.0-ios17.5/OpenCvSdk.iOS.resources/opencv2.frame
work/opencv2[arm64]315
duplicate symbol 'OBJC_METACLASS$_MatOfRect2d' in:
/Users/martinbozso/.nuget/packages/mediapipetaskscommon.ios/0.10.18/lib/net8.0-ios18.0/MediaPipeTasksCommon.resour
ces/MediaPipeTasksCommon.xcframework/ios-arm64/MediaPipeTasksCommon.framework/MediaPipeTasksCommon1488
/Users/martinbozso/.nuget/packages/opencvsdk.ios/4.10.0.1/lib/net8.0-ios17.5/OpenCvSdk.iOS.resources/opencv2.frame
work/opencv2[arm64]1030
/Users/martinbozso/.nuget/packages/mediapipetaskscommon.ios/0.10.18/lib/net8.0-ios18.0/MediaPipeTasksCommon.resour
ces/MediaPipeTasksCommon.xcframework/ios-arm64/MediaPipeTasksCommon.framework/MediaPipeTasksCommon1150
/Users/martinbozso/.nuget/packages/opencvsdk.ios/4.10.0.1/lib/net8.0-ios17.5/OpenCvSdk.iOS.resources/opencv2.frame
work/opencv2[arm64]315
/Users/martinbozso/.nuget/packages/mediapipetaskscommon.ios/0.10.18/lib/net8.0-ios18.0/MediaPipeTasksCommon.resour
ces/MediaPipeTasksCommon.xcframework/ios-arm64/MediaPipeTasksCommon.framework/MediaPipeTasksCommon1150
/Users/martinbozso/.nuget/packages/opencvsdk.ios/4.10.0.1/lib/net8.0-ios17.5/OpenCvSdk.iOS.resources/opencv2.frame
work/opencv2[arm64]315
duplicate symbol 'OBJC_CLASS$_MatOfRect2d' in

  This is my csproj:

      
 <ItemGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">
	<PackageReference Include="TensorFlowLite.iOS" Version="2.17.0" />
  	<PackageReference Include="MediaPipeTasksVision.iOS" Version="0.10.18" />
       <PackageReference Include="MediaPipeTasksCommon.iOS" Version="0.10.18" />
	<PackageReference Include="OpenCvSdk.iOS" Version="4.10.0.1" />
  </ItemGroup>

Looks like MediaPipe uses opencv?
If I remove OpenCvSdk.iOS the it builds correctly.

[Th3L0x]

found this on github:
google-ai-edge/mediapipe#5125

[v-hogood]

It seems like MediaPipe is broken in that it includes a partial OpenCV, preventing anyone who needs a full-featured OpenCV from linking it. But if MediaPipe includes enough OpenCV for your project and you don't need to link full OpenCV then great. Feel free to reopen if not thanks.

[Th3L0x]

Thank you, for reopening the issue.
Related problem: #3 (comment)

[Th3L0x]

I tried to play with the linker flag options and smartlinking true/false like:

<LinkerFlags>-ObjC -u _OBJC_CLASS_$_Rect2d -u _OBJC_CLASS_$_Size2i -u _OBJC_CLASS_$_Converters -u _OBJC_CLASS_$_RotatedRect</LinkerFlags>

or

<LinkerFlags>-force_load MediaPipeTasksCommon.framework/MediaPipeTasksCommon</LinkerFlags>

but unfortunately the same result :/

[Th3L0x]

Hi, I was wondering if there have been any recent updates on this. If there’s anything I can do to assist or contribute, please let me know.

[v-hogood]

MediaPipe has a couple of issues: it doesn't support 16 KB page sizes (google-ai-edge/mediapipe#5728) and it can't be used with OpenCV on iOS because symbols conflict (google-ai-edge/mediapipe#5145).
I will look at those next but you might want to stick to TensorFlowLite Tasks for now.

[v-hogood]

Reported the issue here: google-ai-edge/mediapipe#5834