ILLink : error IL1011: Failed to write 'obj/Release/net9.0-ios/ios-arm64/linked/Microsoft.iOS.dll'

[desunit]

Apple platform

iOS

Framework version

net10.0-*

Affected platform version

.NET 10.0.102, .NET 9.0.300

Description

I'm trying to build IPA but always getting the error:

    ILLink : error IL1011: Failed to write 'obj/Release/net9.0-ios/ios-arm64/linked/Microsoft.iOS.dll'.
    /Users/sergeybogdanov/.nuget/packages/microsoft.net.illink.tasks/9.0.12/build/Microsoft.NET.ILLink.targets(96,5): error NETSDK1144: Optimizing assemblies for size failed.

command line:

dotnet publish "$CSPROJ" \
  -f net10.0-ios \
  -c Release \
  -p:ArchiveOnBuild=true \
  -p:BuildIpa=true \
  -p:CodesignKey="Apple Distribution: ...." \
  -p:CodesignProvision="Apps" \
  /bl:msbuild.binlog

Tried 9.0 and 10.0, still the same problem.

Steps to Reproduce

Change csproj to <MtouchLink>SdkOnly</MtouchLink>

Did you find any workaround?

<MtouchLink>none</MtouchLink> fixes the problem, but the binary becomes huge.

Build logs

msbuild.binlog.zip

[rolfbjarne]

This is the actual exception that happens:

Unhandled exception. Mono.Linker.LinkerFatalErrorException: ILLink: error IL1011: Failed to write 'obj/Release/net9.0-ios/ios-arm64/linked/Microsoft.iOS.dll'.
 ---> System.ArgumentException: Member 'System.Boolean owns' is declared in another module and needs to be imported
   at Mono.Cecil.MetadataBuilder.LookupToken(IMetadataTokenProvider provider)
   at Mono.Cecil.Cil.CodeWriter.WriteOperand(Instruction instruction)
   at Mono.Cecil.Cil.CodeWriter.WriteInstructions()
   at Mono.Cecil.Cil.CodeWriter.WriteResolvedMethodBody(MethodDefinition method)
   at Mono.Cecil.MetadataBuilder.AddMethod(MethodDefinition method)
   at Mono.Cecil.MetadataBuilder.AddType(TypeDefinition type)
   at Mono.Cecil.MetadataBuilder.AddTypes()
   at Mono.Cecil.MetadataBuilder.BuildTypes()
   at Mono.Cecil.MetadataBuilder.BuildModule()
   at Mono.Cecil.MetadataBuilder.BuildMetadata()
   at Mono.Cecil.ModuleWriter.<>c.<BuildMetadata>b__2_0(MetadataBuilder builder, MetadataReader _)
   at Mono.Cecil.ModuleDefinition.Read[TItem,TRet](TItem item, Func`3 read)
   at Mono.Cecil.ModuleWriter.BuildMetadata(ModuleDefinition module, MetadataBuilder metadata)
   at Mono.Cecil.ModuleWriter.Write(ModuleDefinition module, Disposable`1 stream, WriterParameters parameters)
   at Mono.Cecil.ModuleWriter.WriteModule(ModuleDefinition module, Disposable`1 stream, WriterParameters parameters)
   at Mono.Cecil.ModuleDefinition.Write(String fileName, WriterParameters parameters)
   at Mono.Cecil.AssemblyDefinition.Write(String fileName, WriterParameters parameters)
   at Mono.Linker.Steps.OutputStep.WriteAssembly(AssemblyDefinition assembly, String directory, WriterParameters writerParameters)
   --- End of inner exception stack trace ---
   at Mono.Linker.Steps.OutputStep.WriteAssembly(AssemblyDefinition assembly, String directory, WriterParameters writerParameters)
   at Mono.Linker.Steps.OutputStep.WriteAssembly(AssemblyDefinition assembly, String directory)
   at Mono.Linker.Steps.OutputStep.OutputAssembly(AssemblyDefinition assembly)
   at Mono.Linker.Steps.OutputStep.ProcessAssembly(AssemblyDefinition assembly)
   at Mono.Linker.Steps.BaseStep.Process(LinkContext context)
   at Mono.Linker.Pipeline.ProcessStep(LinkContext context, IStep step)
   at Mono.Linker.Pipeline.Process(LinkContext context)
   at Mono.Linker.Driver.Run(ILogger customLogger)
   at Mono.Linker.Driver.Main(String[] args)

Would it be possible to get access to your project so that we can reproduce this ourselves? Or could you create a test project we can use?

[desunit]

I was able to workaround the issue by adding:

<_ExtraTrimmerArgs>--action copy -a Microsoft.iOS</_ExtraTrimmerArgs>

I'm trying to create a reproducible example but no luck for now since the project is quite large and trying to find the module that causes that.

[desunit]

@rolfbjarne that was tough but I've nailed it - it's somehow related to AUGraph:
MauiApp2.zip

[rolfbjarne]

Thanks a lot!

I can reproduce and a fix is on the way.