ILStrip failed when trying to publish net9.0-ios with Google.Maps.Utils.iOS.dll

[tklptbs]

Apple platform

iOS

Framework version

net9.0-ios

Affected platform version

.NET 9.0

Description

We are now in the middle of moving from .Net 8 to .Net 9 with MAUI app.
There is a problem with one of the packages that contains Google.Maps.Utils.iOS.dll and it doesn't matter if we are using Nuget like this: https://www.nuget.org/packages/Onion.Maui.GoogleMaps.Clustering/ or our own binding.

There is an error when publishing:
/usr/local/share/dotnet/packs/Microsoft.iOS.Sdk.net9.0_18.4/18.4.9289/targets/Xamarin.Shared.Sdk.targets(917,3): error : ILStrip failed for obj/Release/net9.0-ios/ios-arm64/linked/Google.Maps.Utils.iOS.dll: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')

No trimmer settings i helping here as it looks like trimming process is quite ok. The error can be fixed only by setting <EnableAssemblyILStripping>false</EnableAssemblyILStripping> which we do not want.

This behavriour is only observed on .Net 9 while it was fine on previous version.

Steps to Reproduce

clone https://github.com/tklptbs/mapsilstriprepro/tree/main
Run dotnet publish -f "net9.0-ios" -c "Release" on attached repo

Did you find any workaround?

<EnableAssemblyILStripping>false</EnableAssemblyILStripping>

Build logs

No response

[rolfbjarne]

I can reproduce, this is the output from the ILStrip task:

IL stripping assemblies
Task "MobileILStrip" requested 6 cores, acquired 6 cores, and now holds 6 cores total.
[ILStrip] obj/Release/net9.0-ios/ios-arm64/linked/Google.Maps.dll to obj/Release/net9.0-ios/ios-arm64/stripped/Google.Maps.dll
[ILStrip] obj/Release/net9.0-ios/ios-arm64/linked/Microsoft.iOS.dll to obj/Release/net9.0-ios/ios-arm64/stripped/Microsoft.iOS.dll
[ILStrip] obj/Release/net9.0-ios/ios-arm64/linked/System.Runtime.dll to obj/Release/net9.0-ios/ios-arm64/stripped/System.Runtime.dll
[ILStrip] obj/Release/net9.0-ios/ios-arm64/linked/MapsILStripRepro.dll to obj/Release/net9.0-ios/ios-arm64/stripped/MapsILStripRepro.dll
[ILStrip] obj/Release/net9.0-ios/ios-arm64/linked/System.Private.CoreLib.dll to obj/Release/net9.0-ios/ios-arm64/stripped/System.Private.CoreLib.dll
[ILStrip] obj/Release/net9.0-ios/ios-arm64/linked/Google.Maps.Utils.iOS.dll to obj/Release/net9.0-ios/ios-arm64/stripped/Google.Maps.Utils.iOS.dll
Assembly loaded during TaskRun (Xamarin.MacDev.Tasks.MobileILStrip): System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 (location: /usr/local/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/System.dll, MVID: 2c5438a3-dd6e-470f-96ec-e68dc7786cac, AppDomain: Default)
Assembly loaded during TaskRun (Xamarin.MacDev.Tasks.MobileILStrip): System.Diagnostics.StackTrace, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a (location: /usr/local/share/dotnet/shared/Microsoft.NETCore.App/9.0.4/System.Diagnostics.StackTrace.dll, MVID: 739e67ee-24e4-416a-b66b-8690b14f1bf5, AppDomain: Default)
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'index')
   at System.Collections.CollectionBase.System.Collections.IList.get_Item(Int32 index)
   at CilStrip.Mono.Cecil.AssemblyNameReferenceCollection.get_Item(Int32 index)
   at CilStrip.Mono.Cecil.ReflectionReader.AddTypeRef(TypeRefTable typesRef, Int32 i)
   at CilStrip.Mono.Cecil.ReflectionReader.VisitTypeDefinitionCollection(TypeDefinitionCollection types)
   at CilStrip.Mono.Cecil.AggressiveReflectionReader.VisitTypeDefinitionCollection(TypeDefinitionCollection types)
   at CilStrip.Mono.Cecil.ReflectionReader.VisitModuleDefinition(ModuleDefinition mod)
   at CilStrip.Mono.Cecil.StructureReader.TerminateAssemblyDefinition(AssemblyDefinition asm)
   at CilStrip.Mono.Cecil.AssemblyDefinition.Accept(IReflectionStructureVisitor visitor)
   at CilStrip.Mono.Cecil.AssemblyFactory.GetAssembly(ImageReader irv, Boolean manifestOnly)
   at CilStrip.Mono.Cecil.AssemblyFactory.GetAssembly(ImageReader reader)
   at CilStrip.Mono.Cecil.AssemblyFactory.GetAssembly(String file)
   at AssemblyStripper.AssemblyStripper.StripAssembly(String assemblyFile, String outputPath)
   at AssemblyStripper.AssemblyStripper.TryStripAssembly(String assemblyFile, String outputPath)
   at ILStrip.StripAssembly(ITaskItem assemblyItem)

Binlog: msbuild.binlog.zip

The ILStrip code is in the dotnet/runtime repository, so moving the issue there.

[dotnet-policy-service]

Tagging subscribers to 'os-ios': @vitek-karas, @kotlarmilos, @ivanpovazan, @steveisok, @akoeplinger
See info in area-owners.md if you want to be subscribed.

[steveisok]

Wonder if something is getting linked out that shouldn't?

[tklptbs]

Most probably. But we have tried every techniqe to block linking we know. Anything specific we can try?

[jtexter3]

I am also facing this same issue. Any updates?