[BUG] ReactiveUI.Events - Linker error with Android 10

[EmilienDup]

Describe the bug
Impossible to link ReactiveUI.Events assembly on Android, with Android Target SDK 10.0

Steps To Reproduce

1. Create a new xamarin android app
2. Open project preferences
3. Build > General > Compile using Android version: Android 10.0 (Q)
4. Build > Android Build > Linker > Linker Options > Linker behaviour: Link SDK assemblies Only
5. Add ReactiveUI.Events nuget package v 11.2.3
6. Build the project

Expected behavior
The project builds successfully

Actual behavior
Build fails

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(5,5): Error XALNK7000: Mono.Linker.MarkException: Error processing method: 'System.Void Android.Media.RxAudioRecordEvents::<get_RoutingChanged>b__7_1(System.EventHandler`1<Android.Media.AudioRecord/RoutingChangedEventArgs>)' in assembly: 'ReactiveUI.Events.dll' ---> Mono.Cecil.ResolutionException: Failed to resolve System.Void Android.Media.AudioRecord::add_RoutingChanged(System.EventHandler`1<Android.Media.AudioRecord/RoutingChangedEventArgs>)
  at Mono.Linker.Steps.MarkStep.HandleUnresolvedMethod (Mono.Cecil.MethodReference reference) [0x00013] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Steps.MarkStep.MarkMethod (Mono.Cecil.MethodReference reference) [0x00049] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Steps.MarkStep.MarkInstruction (Mono.Cecil.Cil.Instruction instruction) [0x00040] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Steps.MarkStep.MarkMethodBody (Mono.Cecil.Cil.MethodBody body) [0x000c2] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Steps.MarkStep.ProcessMethod (Mono.Cecil.MethodDefinition method) [0x001b1] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Steps.MarkStep.ProcessQueue () [0x0001b] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
   --- End of inner exception stack trace ---
  at Mono.Linker.Steps.MarkStep.ProcessQueue () [0x00047] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Steps.MarkStep.ProcessPrimaryQueue () [0x0000a] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Steps.MarkStep.Process () [0x000f6] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Steps.MarkStep.Process (Mono.Linker.LinkContext context) [0x0000d] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at MonoDroid.Tuner.MonoDroidMarkStep.Process (Mono.Linker.LinkContext context) [0x0000b] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Pipeline.ProcessStep (Mono.Linker.LinkContext context, Mono.Linker.Steps.IStep step) [0x0000d] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Mono.Linker.Pipeline.Process (Mono.Linker.LinkContext context) [0x0000f] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at MonoDroid.Tuner.Linker.Run (Mono.Linker.Pipeline pipeline, Mono.Linker.LinkContext context) [0x00000] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at MonoDroid.Tuner.Linker.Process (MonoDroid.Tuner.LinkerOptions options, Mono.Linker.ILogger logger, Mono.Linker.LinkContext& context) [0x00071] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Xamarin.Android.Tasks.LinkAssemblies.Execute (Java.Interop.Tools.Cecil.DirectoryAssemblyResolver res) [0x001dd] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Xamarin.Android.Tasks.LinkAssemblies.RunTask () [0x0001b] in <93105d8439ce45cf8f29caa4b3c699f9>:0 
  at Xamarin.Android.Tasks.AndroidTask.Execute () [0x00000] in <93105d8439ce45cf8f29caa4b3c699f9>:0  (XALNK7000) (Support)

Screenshots

Environment

=== Visual Studio Community 2019 for Mac (Preview) ===

Version 8.6 Preview (8.6 build 3437)
Installation UUID: a3b7188a-f47e-48f8-98e5-182f30462934
	GTK+ 2.24.23 (Raleigh theme)
	Xamarin.Mac 6.18.0.21 (d16-6 / a87d63c06)

	Package version: 610000095

=== Mono Framework MDK ===

Runtime:
	Mono 6.10.0.95 (2019-12/f2379f2d665) (64-bit)
	Package version: 610000095

=== Roslyn (Language Service) ===

3.6.0-2.20164.4+923b4bdbbd33307456464f4c90222a61af278972

=== NuGet ===

Version: 5.4.0.6315

=== .NET Core SDK ===

SDK: /usr/local/share/dotnet/sdk/3.1.200/Sdks
SDK Versions:
	3.1.200
	3.1.102
	3.1.100
	3.1.100-preview3-014645
	3.1.100-preview2-014569
	3.0.100
	3.0.100-rc1-014190
	3.0.100-preview9-014004
	3.0.100-preview7-012821
	2.1.701
	2.1.700
	2.1.505
	2.1.202
	2.0.3
MSBuild SDKs: /Library/Frameworks/Mono.framework/Versions/6.10.0/lib/mono/msbuild/Current/bin/Sdks

=== .NET Core Runtime ===

Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
	3.1.2
	3.1.0
	3.1.0-preview3.19553.2
	3.1.0-preview2.19525.6
	3.0.0
	3.0.0-rc1-19456-20
	3.0.0-preview9-19423-09
	3.0.0-preview7-27912-14
	2.1.16
	2.1.14
	2.1.13
	2.1.12
	2.1.11
	2.1.9
	2.0.9
	2.0.3

=== Xamarin.Profiler ===

Version: 1.6.13.11
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Xamarin Designer ===

Version: 16.6.0.267
Hash: fa27dc7ce
Branch: remotes/origin/d16-6
Build date: 2020-03-19 20:26:14 UTC

=== Xamarin.Android ===

Version: 10.3.0.33 (Visual Studio Community)
Commit: xamarin-android/d16-6/e9fa8c4
Android SDK: /Users/emilien/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		8.1 (API level 27)

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 29.0.6
SDK Build Tools Version: 29.0.2

Build Information: 
Mono: d90665a
Java.Interop: xamarin/java.interop/d16-6@2cab35c
ProGuard: xamarin/proguard/master@905836d
SQLite: xamarin/sqlite/3.31.1@49232bc
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-6@bfb66f3

=== Microsoft Mobile OpenJDK ===

Java SDK: /Users/emilien/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Android SDK Manager ===

Version: 16.6.0.46
Hash: f6bfa7b
Branch: remotes/origin/d16-6
Build date: 2020-03-13 00:13:30 UTC

=== Android Device Manager ===

Version: 16.6.0.75
Hash: 4509c53
Branch: remotes/origin/d16-6
Build date: 2020-03-13 00:13:52 UTC

=== Apple Developer Tools ===

Xcode 11.3.1 (15715)
Build 11C504

=== Xamarin.Mac ===

Version: 6.18.0.21 (Visual Studio Community)
Hash: a87d63c06
Branch: d16-6
Build date: 2020-03-02 11:17:04-0500

=== Xamarin.iOS ===

Version: 13.18.0.21 (Visual Studio Community)
Hash: a87d63c06
Branch: d16-6
Build date: 2020-03-02 11:17:05-0500

=== Xamarin Inspector ===

Version: 1.4.3
Hash: db27525
Branch: 1.4-release
Build date: Mon, 09 Jul 2018 21:20:18 GMT
Client compatibility: 1

=== Build Information ===

Release ID: 806003437
Git revision: b6e23a27c18a3e6f8eb620ff1814fb76b3f47921
Build date: 2020-03-20 11:39:40-04
Build branch: release-8.6
Xamarin extensions: b6e23a27c18a3e6f8eb620ff1814fb76b3f47921

=== Operating System ===

Mac OS X 10.15.3
Darwin 19.3.0 Darwin Kernel Version 19.3.0
    Thu Jan  9 20:58:23 PST 2020
    root:xnu-6153.81.5~1/RELEASE_X86_64 x86_64

Related to #2083.
Does Reactive.Events supports only Android 9.0 and below?

[open-collective-bot]

Hey @EmilienDup 👋,

Thank you for opening an issue. We will get back to you as soon as we can. Also, check out our Open Collective and consider contributing financially.

https://opencollective.com/reactiveui

PS.: We offer priority support for all financial contributors. Don't forget to add priority label once you start contributing 😄

ReactiveUI - Open Collective

An advanced, composable, functional reactive model-view-viewmodel framework for all .NET platforms!

[glennawatson]

Thanks @EmilienDup I have an idea what this one be, but won't be fixed for a week or so.

[EmilienDup]

Hi @glennawatson, noted!
Thanks for you quick response.

[lwschan]

@EmilienDup do you know which is the latest version for Reactive.Events that doesn't have this bug?

[glennawatson]

It would still be an issue. I just been bogged down in real life to fix. All our stuff is set to android 9 at the moment

[lwschan]

Oh cool, thank you for the info!

[lwschan]

Any news on this bug? This is a bit annoying, because we have to disable linker in our app for the app to compile. So the app size is much bigger than it needs to be. :(

[glennawatson]

Consider using Source Generator Events. It will only generate the code to the events you deliberately use so will reduce your linking size.

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.