Failed to publish C# solution for android export using linux bionic on newer .NET due do deprecation

[HKunogi]

Tested versions

• Reproducible in 4.5 d89f4ab

System information

Windows 11 - Godot 4.5 built from source

Issue description

Seems godot android C# support relies on monovm from microsoft, but those packages were deprecated as of .NET 9 (current release), and they didnt publish any .NET 9 version past preview 7 (due to deprecation), this makes impossible to export for android with c# support enabled using latest feature sets of .net (which includes all future releases)

Steps to reproduce

Simply try using newer .NET and exporting for android using linux bionic option

Minimal reproduction project (MRP)

Any project with a simple C# hello world would suffice

[shadowfox87]

Agreed, we would like to continue using Godot and hope that this compatibility can be added so we can build android apps using C#.

[raulsntos]

Thanks for reaching out! It seems there are a few misunderstandings.

First of all, Microsoft is not deprecating all MonoVM runtime packages, only the packages for desktop platforms (Windows, Linux, macOS). You can see the full list of the packages that were deprecated in the link you posted.

Like the Microsoft announcement says, the desktop MonoVM runtime packages are not the default configuration for .NET publish scenarios. You would've only been using the MonoVM runtime on these platforms if you enabled an undocumented SDK switch. This is also the case for Godot on these platforms. The default runtime, CoreCLR, tends to perform better on these platforms so there's no reason to use MonoVM.

To reiterate, this breaking change does not impact MonoVM's support for its primary shipping scenario: iOS, Android, WASM, etc. ¹

Second, linux-bionic is not the default nor the recommended runtime for exporting to Android using Godot. This was added in #97908 as an advanced option for users to export using NativeAOT. There is no real support for NativeAOT on Android yet², so the only way to get it is using the linux-bionic runtime, and some advanced users wanted to do that.

However, I must reiterate that this is not the recommended runtime. It's not enabled by default, and you shouldn't use it if you don't know what you are doing. The linux-bionic runtime has a number of limitations and is most likely not what you want to use. If you enable it, be aware that there are a lot of things that may not work and it's only intended to be used for NativeAOT, not MonoVM.

I hope that clears all the misunderstandings. In short, Godot is unaffected by these deprecations.

Footnotes

1. https://github.com/dotnet/docs/issues/41366#issuecomment-2210713569 ↩

2. https://github.com/dotnet/runtime/issues/106748 ↩

[HKunogi]

I see, thanks for your answer, so the problem were actually using NativeAOT, which isn't supported without the linux-bionic. Is there any other way to use NativeAOT without it? Or is it planned at anytime to have such option?
Also, even disabling both the NativeAOT and linux-bionic options, when running on android, it seems to throw SSL errors when trying to hit HTTPS endpoints, is there any workaround on it?
E 0:00:02:936 :0 @ --- End of inner exception stack trace ---(): System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception. ---> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception. ---> Interop+AndroidCrypto+SslException: Exception of type 'Interop+AndroidCrypto+SslException' was thrown. <C++ Error> System.Net.Http.HttpRequestException <C++ Source> :0 @ --- End of inner exception stack trace ---() <Stack Trace> :0 @ --- End of inner exception stack trace ---() :0 @ void System.Net.Security.SslStream+<ForceAuthenticationAsync>d__1571[[System.Net.AsyncReadWriteAdapter, System.Net.Security, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ void System.Net.Http.ConnectHelper+<EstablishSslConnectionAsync>d__2.MoveNext() :0 @ --- End of inner exception stack trace ---()

[raulsntos]

I see, thanks for your answer, so the problem were actually using NativeAOT, which isn't supported without the linux-bionic. Is there any other way to use NativeAOT without it?

No, for Android linux-bionic is the only way to use NativeAOT at the moment. Be aware of its limitations.

I'll reiterate that MonoVM has nothing to do with NativeAOT, so if you are seeing errors regarding MonoVM then your project is likely not configured to use NativeAOT properly. You'll have to share your .csproj if you want us to be able to provide more help, but the most likely scenario is you forgot <PublishAot>true</PublishAot> or it's under a condition that doesn't match.

Or is it planned at anytime to have such option?

When NativeAOT is supported on Android upstream, it will likely work on Godot too. See issue upstream:

• NativeAOT status for Android dotnet/runtime#106748

Also, even disabling both the NativeAOT and linux-bionic options, when running on android, it seems to throw SSL errors when trying to hit HTTPS endpoints, is there any workaround on it?

You'll have to provide more details about this. What is the endpoint? Does it work on a C# console application? Does it work on a web browser (i.e.: Google Chrome)?

But it's most likely not an issue on Godot's side, since you are getting a proper exception and not a crash. It may be a bug on your code or upstream on the .NET runtime.

[HKunogi]

Thanks for the info, here is an MRP with the SSL issue I've experienced, the URL on this example is a simple JSON file hosted here on github itself.
MRPSharp.zip
Simply running it using the remote deploy / debug from editor to android will then proceed to trigger the error below, it does not error and works 100% fine when running on desktop platform, be on editor or exported build:
E 0:00:03:265 :0 @ --- End of inner exception stack trace ---(): System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception. ---> System.Security.Authentication.AuthenticationException: Authentication failed, see inner exception. ---> Interop+AndroidCrypto+SslException: Exception of type 'Interop+AndroidCrypto+SslException' was thrown. <C++ Error> System.Net.Http.HttpRequestException <C++ Source> :0 @ --- End of inner exception stack trace ---() <Stack Trace> :0 @ --- End of inner exception stack trace ---() :0 @ void System.Net.Security.SslStream+<ForceAuthenticationAsync>d__1571[[System.Net.AsyncReadWriteAdapter, System.Net.Security, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ void System.Net.Http.ConnectHelper+<EstablishSslConnectionAsync>d__2.MoveNext() :0 @ --- End of inner exception stack trace ---() :0 @ void System.Net.Http.ConnectHelper+<EstablishSslConnectionAsync>d__2.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ void System.Net.Http.HttpConnectionPool+<ConnectAsync>d__50.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ void System.Net.Http.HttpConnectionPool+<CreateHttp11ConnectionAsync>d__78.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ void System.Net.Http.HttpConnectionPool+<InjectNewHttp11ConnectionAsync>d__77.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ System.Net.Http.HttpConnection System.Runtime.CompilerServices.ConfiguredTaskAwaitable1+ConfiguredTaskAwaiter[[System.Net.Http.HttpConnection, System.Net.Http, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].GetResult() :0 @ void System.Threading.Tasks.TaskCompletionSourceWithCancellation1+<WaitWithCancellationAsync>d__1[[System.Net.Http.HttpConnection, System.Net.Http, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ void System.Net.Http.HttpConnectionPool+<SendWithVersionDetectionAndRetryAsync>d__49.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ void System.Net.Http.RedirectHandler+<SendAsync>d__4.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ System.Net.Http.HttpResponseMessage System.Runtime.CompilerServices.ConfiguredTaskAwaitable1+ConfiguredTaskAwaiter[[System.Net.Http.HttpResponseMessage, System.Net.Http, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].GetResult() :0 @ void System.Net.Http.SocketsHttpHandler+<<SendAsync>g__CreateHandlerAndSendAsync|115_0>d.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ System.Net.Http.HttpResponseMessage System.Runtime.CompilerServices.ConfiguredTaskAwaitable1+ConfiguredTaskAwaiter[[System.Net.Http.HttpResponseMessage, System.Net.Http, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].GetResult() :0 @ void System.Net.Http.HttpClient+<<SendAsync>g__Core|83_0>d.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ System.Net.Http.HttpResponseMessage System.Runtime.CompilerServices.TaskAwaiter1[[System.Net.Http.HttpResponseMessage, System.Net.Http, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].GetResult() :0 @ void Test.Helloworld+<GetResponseAsync>d__5.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ System.Net.Http.HttpResponseMessage System.Runtime.CompilerServices.TaskAwaiter1[[System.Net.Http.HttpResponseMessage, System.Net.Http, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].GetResult() :0 @ void Test.Helloworld+<GetResponseAsync>d__41[[Test.Test, MRPSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ Test.Test System.Runtime.CompilerServices.TaskAwaiter1[[Test.Test, MRPSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].GetResult() :0 @ void Test.Helloworld+<GetResponseAsync>d__31[[Test.Test, MRPSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(System.Threading.Tasks.Task) :0 @ void System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(System.Threading.Tasks.Task, System.Threading.Tasks.ConfigureAwaitOptions) :0 @ Test.Test System.Runtime.CompilerServices.TaskAwaiter1[[Test.Test, MRPSharp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].GetResult() :0 @ void Test.Helloworld+<_Ready>d__2.MoveNext() :0 @ void System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() :0 @ void System.Threading.Tasks.Task+<>c.<ThrowAsync>b__124_0(object) :0 @ void Godot.GodotSynchronizationContext.ExecutePendingContinuations() :0 @ void Godot.GodotTaskScheduler.Activate() :0 @ void Godot.Bridge.ScriptManagerBridge.FrameCallback()

[raulsntos]

Looks like you are targeting .NET 10 which is still in preview, using .NET 9 your MRP works fine for me. Since .NET 10 is still in preview, there may still be bugs. As mentioned earlier, it's most likely not an issue on Godot's side. It looks like it may be a bug upstream on .NET.

[HKunogi]

Looks like you are targeting .NET 10 which is still in preview, using .NET 9 your MRP works fine for me. Since .NET 10 is still in preview, there may still be bugs. As mentioned earlier, it's most likely not an issue on Godot's side. It looks like it may be a bug upstream on .NET.

That would explain it not launching properly, thank you very much.