Cannot publish android project with ReadyToRun

[MaxwellDAssistek]

Description

When I attempt to publish an Android project (with or without MAUI) using ReadyToRun, I get an exception while building.

Reproduction Steps

1. Create a new Android app project.
2. Add the following to the csproj file:

    <RunAOTCompilation>false</RunAOTCompilation>
    <PublishTrimmed>false</PublishTrimmed>
    <PublishReadyToRun>true</PublishReadyToRun>

3. Run the following command: dotnet publish -f net8.0-android -c Release -p:RuntimeIdentifier=android-arm64

Expected behavior

Publish should complete successfully.

Actual behavior

MSBuild version 17.9.8+b34f75857 for .NET
  Determining projects to restore...
  Restored <snip>\AndroidApp1\AndroidApp1\AndroidApp1.csproj (in 279 ms).
  AndroidApp1 -> <snip>\AndroidApp1\AndroidApp1\bin\Release\net8.0-android\android-arm64\  AndroidApp1.dll
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(470,5): error : Error: Object reference not set to an instance of an object. [<snip>\AndroidApp1\AndroidApp 1\AndroidApp1.csproj]
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(470,5): error : System.NullReferenceException: Object reference not set to an instance of an object. [<snip>\AndroidApp1\AndroidApp1\AndroidApp1.csproj]
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(470,5): error :     at ILCompiler.ProcessLinkerXmlBase.ProcessXml(Boolean) + 0xd9 [<snip>\AndroidApp1\AndroidApp1\AndroidApp1.csproj]
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(470,5): error :     at ILCompiler.Compilation..ctor(DependencyAnalyzerBase`1, NodeFactory, IEnumerable`1, ILProvider, DevirtualizationManager, IEnumerable`1, Logger, InstructionSetSupport) + 0x143 [<snip>\AndroidApp1\AndroidApp1\AndroidApp1.csproj]
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(470,5): error :     at ILCompiler.ReadyToRunCodegenCompilation..ctor(DependencyAnalyzerBase`1, NodeFactory, IEnumerable`1, ILProvider, Logger, DevirtualizationManager, IEnumerable`1, String, InstructionSetSupport, Boolean, Boolean, Boolean, Boolean, Func`2, String, Boolean, String, Int32, Boolean, Int32, ProfileDataManager, ReadyToRunMethodLayoutAlgorithm, ReadyToRunFileLayoutAlgorithm, Int32, Boolean) + 0x1b5 [<snip>\AndroidApp1\AndroidApp1\AndroidApp 
1.csproj]
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(470,5): error :     at ILCompiler.ReadyToRunCodegenCompilationBuilder.ToCompilation() + 0x6ac [<snip>\AndroidApp1\AndroidApp1\AndroidApp1.csproj]
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(470,5): error :     at ILCompiler.Program.RunSingleCompilation(Dictionary`2, InstructionSetSupport, String, Dictionary`2, HashSet`1, ReadyToRunCompilerContext, Logger) + 0x1d23 [<snip>\AndroidApp1\AndroidApp1\AndroidApp1.csproj]
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(470,5): error :     at ILCompiler.Program.Run() + 0x11c6 [<snip>\AndroidApp1\AndroidApp1\AndroidApp1.csproj] 
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(470,5): error :     at ILCompiler.Crossgen2RootCommand.<>c__DisplayClass205_0.<.ctor>b__0(ParseResult result) + 0x3e9 [<snip>\AndroidApp1\AndroidApp1\AndroidApp1.csproj]
C:\Program Files\dotnet\sdk\8.0.204\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.CrossGen.targets(358,5): error NETSDK1096: Optimizing assemblies for performance failed. You can either exclude the failing assemblies from being optimized, or set the PublishReadyToRun property to false. [<snip>\AndroidApp1\AndroidApp1\AndroidApp1.csproj]

Regression?

No response

Known Workarounds

No response

Configuration

.NET version 8.0.204
Windows 10

Other information

No response

[dotnet-policy-service]

Tagging subscribers to 'arch-android': @vitek-karas, @simonrozsival, @steveisok, @akoeplinger
See info in area-owners.md if you want to be subscribed.

[filipnavara]

.NET on Android uses the MonoVM runtime. R2R is only available with CoreCLR runtime and it's thus NOT available on Android.

However, MonoVM does support ahead of time compilation and profiled AOT.

[MaxwellDAssistek]

@filipnavara I am looking to dynamically load some plugins during runtime, which prevents using AOT, so I was attempting to use Ready To Run to optimize the first-load performance of these plugins.

[filipnavara]

@filipnavara I am looking to dynamically load some plugins during runtime, which prevents using AOT, so I was attempting to use Ready To Run to optimize the first-load performance of these plugins.

MonoVM AOT is technically closer to how CoreCLR ReadyToRun works. It still allows dynamic code. It's NOT the same as NativeAOT that has the restrictions you are mentioning.