"Optimizing assemblies for size failed" - Core 9 Latest Maui iOS Build

[mnxamdev]

Description

Same as #104945

Reproduction Steps

/usr/local/share/dotnet/dotnet publish /Users/me/myproject/myapp.csproj --framework net9.0-ios --configuration InternalBuild --runtime ios-arm64 /p:ArchiveOnBuild=true

Expected behavior

Builds on iOS.

Actual behavior

Error output during build (note: trying to build iOS IPA which always worked before updating to MAUI 9, works on development macs)

Fatal error in IL Linker
14:21:42                Unhandled exception. Mono.Linker.LinkerFatalErrorException: ILLink: error IL1011: Failed to write 'obj/QABuild/net9.0-ios/ios-arm64/linked/Microsoft.iOS.dll'.
14:21:42                 ---> System.ArgumentException: Member 'System.Boolean owns' is declared in another module and needs to be imported
14:21:42                   at Mono.Cecil.MetadataBuilder.LookupToken(IMetadataTokenProvider provider)
14:21:42                   at Mono.Cecil.Cil.CodeWriter.WriteOperand(Instruction instruction)
14:21:42                   at Mono.Cecil.Cil.CodeWriter.WriteInstructions()
14:21:42                   at Mono.Cecil.Cil.CodeWriter.WriteResolvedMethodBody(MethodDefinition method)
14:21:42                   at Mono.Cecil.MetadataBuilder.AddMethod(MethodDefinition method)
14:21:42                   at Mono.Cecil.MetadataBuilder.AddType(TypeDefinition type)
14:21:42                   at Mono.Cecil.MetadataBuilder.AddTypes()
14:21:42                   at Mono.Cecil.MetadataBuilder.BuildTypes()
14:21:42                   at Mono.Cecil.MetadataBuilder.BuildModule()
14:21:42                   at Mono.Cecil.MetadataBuilder.BuildMetadata()
14:21:42                   at Mono.Cecil.ModuleWriter.<>c.<BuildMetadata>b__2_0(MetadataBuilder builder, MetadataReader _)
14:21:42                   at Mono.Cecil.ModuleDefinition.Read[TItem,TRet](TItem item, Func`3 read)
14:21:42                   at Mono.Cecil.ModuleWriter.BuildMetadata(ModuleDefinition module, MetadataBuilder metadata)
14:21:42                   at Mono.Cecil.ModuleWriter.Write(ModuleDefinition module, Disposable`1 stream, WriterParameters parameters)
14:21:42                   at Mono.Cecil.ModuleWriter.WriteModule(ModuleDefinition module, Disposable`1 stream, WriterParameters parameters)
14:21:42                   at Mono.Cecil.ModuleDefinition.Write(String fileName, WriterParameters parameters)
14:21:42                   at Mono.Cecil.AssemblyDefinition.Write(String fileName, WriterParameters parameters)
14:21:42                   at Mono.Linker.Steps.OutputStep.WriteAssembly(AssemblyDefinition assembly, String directory, WriterParameters writerParameters)
14:21:42                   --- End of inner exception stack trace ---
14:21:42                   at Mono.Linker.Steps.OutputStep.WriteAssembly(AssemblyDefinition assembly, String directory, WriterParameters writerParameters)
14:21:42                   at Mono.Linker.Steps.OutputStep.WriteAssembly(AssemblyDefinition assembly, String directory)
14:21:42                   at Mono.Linker.Steps.OutputStep.OutputAssembly(AssemblyDefinition assembly)
14:21:42                   at Mono.Linker.Steps.OutputStep.ProcessAssembly(AssemblyDefinition assembly)
14:21:42                   at Mono.Linker.Steps.BaseStep.Process(LinkContext context)
14:21:42                   at Mono.Linker.Pipeline.ProcessStep(LinkContext context, IStep step)
14:21:42                   at Mono.Linker.Pipeline.Process(LinkContext context)
14:21:42                   at Mono.Linker.Driver.Run(ILogger customLogger)
14:21:42                   at Mono.Linker.Driver.Main(String[] args)
14:21:42                Build continuing because "ContinueOnError" on the task "ILLink" is set to "ErrorAndContinue".
14:21:42            1>Done Building Project "/Users/macbuild/buildAgent/work/6715574de90c19a4/myproject/myapp.csproj" (Publish target(s)) -- FAILED.
14:21:42       
14:21:43          1>ILLink : error IL1011: Failed to write 'obj/InternalBuild/net9.0-ios/ios-arm64/linked/Microsoft.iOS.dll'.
14:21:43          1>/Users/macbuild/.nuget/packages/microsoft.net.illink.tasks/9.0.3/build/Microsoft.NET.ILLink.targets(96,5): error NETSDK1144: Optimizing assemblies for size failed.

Regression?

Yes. Worked fine with .Net MAUI 8

Known Workarounds

None. Tried this but didn't work:
<_AggressiveAttributeTrimming>false</_AggressiveAttributeTrimming>

Configuration

macOS Sequoia 15.3.2
Intel Mac

<PropertyGroup Condition="$(TargetFramework.Contains('-ios')) and '$(Configuration)' == 'InternalBuild'">
		<DefineConstants>__IOS__;__INTERNALBUILD__;</DefineConstants>
		<Optimize>True</Optimize>
		<DebugType>portable</DebugType>
		<CreatePackage>false</CreatePackage>
		<CodesignProvision>Automatic:AdHoc</CodesignProvision>
		<CodesignKey>iPhone Distribution</CodesignKey>
		<MtouchEnableSGenConc>true</MtouchEnableSGenConc>
		<BuildIpa>true</BuildIpa>
		<CodesignEntitlements>Platforms\iOS\Entitlements.plist</CodesignEntitlements>
		<MtouchLink>SdkOnly</MtouchLink>
		<UseInterpreter>true</UseInterpreter>
	</PropertyGroup>

.NET SDK:
 Version:           9.0.202
 Commit:            3a53853c30
 Workload version:  9.0.200-manifests.5c4e24dc
 MSBuild version:   17.13.13+1c2026462

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  15.3
 OS Platform: Darwin
 RID:         osx-x64
 Base Path:   /usr/local/share/dotnet/sdk/9.0.202/

.NET workloads installed:
 [maui-maccatalyst]
   Installation Source: SDK 9.0.200
   Manifest Version:    9.0.14/9.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/9.0.100/microsoft.net.sdk.maui/9.0.14/WorkloadManifest.json
   Install Type:        FileBased

 [maui-ios]
   Installation Source: SDK 9.0.200
   Manifest Version:    9.0.14/9.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/9.0.100/microsoft.net.sdk.maui/9.0.14/WorkloadManifest.json
   Install Type:        FileBased

 [maui-android]
   Installation Source: SDK 9.0.200
   Manifest Version:    9.0.14/9.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/9.0.100/microsoft.net.sdk.maui/9.0.14/WorkloadManifest.json
   Install Type:        FileBased

 [ios]
   Installation Source: SDK 9.0.200
   Manifest Version:    18.2.9180/9.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/9.0.100/microsoft.net.sdk.ios/18.2.9180/WorkloadManifest.json
   Install Type:        FileBased

 [maui-mobile]
   Installation Source: SDK 9.0.200
   Manifest Version:    9.0.14/9.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/9.0.100/microsoft.net.sdk.maui/9.0.14/WorkloadManifest.json
   Install Type:        FileBased

 [maui]
   Installation Source: SDK 9.0.200
   Manifest Version:    9.0.14/9.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/9.0.100/microsoft.net.sdk.maui/9.0.14/WorkloadManifest.json
   Install Type:        FileBased

 [android]
   Installation Source: SDK 9.0.200
   Manifest Version:    35.0.50/9.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/9.0.100/microsoft.net.sdk.android/35.0.50/WorkloadManifest.json
   Install Type:        FileBased

Configured to use loose manifests when installing new manifests.

Host:
  Version:      9.0.3
  Architecture: x64
  Commit:       831d23e561

Other information

Please fix soon or provide a workaround please. Thank you.

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[mnxamdev]

I just tried this on my M1 mac and this also failed when trying create iOS release/adhoc build:

.NET SDK:
 Version:           9.0.102
 Commit:            cb83cd4923
 Workload version:  9.0.100-manifests.693890c1
 MSBuild version:   17.12.18+ed8c6aec5

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  14.6
 OS Platform: Darwin
 RID:         osx-arm64
 Base Path:   /usr/local/share/dotnet/sdk/9.0.102/

.NET workloads installed:
 [maui]
   Installation Source: SDK 9.0.100
   Manifest Version:    9.0.14/9.0.100
   Manifest Path:       /usr/local/share/dotnet/sdk-manifests/9.0.100/microsoft.net.sdk.maui/9.0.14/WorkloadManifest.json
   Install Type:        FileBased

Configured to use loose manifests when installing new manifests.

Host:
  Version:      9.0.1
  Architecture: arm64
  Commit:       c8acea2262

[mnxamdev]

I found the code that was causing the problem. Like the linked issue above, perhaps the error is not representative of what's broken. I had to rewrite some code so it wasn't using AUGraph. I commented out all the code and merely having this in the code broke the build as reported:

private AUGraph _graph;

[jenyangk]

Running into this issue too. Not exactly sure what changed. The error doesn't occur when building for iOS Simulators.