AOT mode Hybrid does not CIL strip the assemblies that end up in the APK

[EDMIStephen]

Steps to Reproduce

1. Attempt to build/deploy Android app with the following csproj

<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'InternalRelease|AnyCPU'">
    <DebugSymbols>false</DebugSymbols> 
    <DebugType>none</DebugType> 
    <Optimize>true</Optimize> 
    <AssemblyName>Projectname.Mobile.Droid.Internal</AssemblyName>
    <OutputPath>bin\InternalRelease\</OutputPath>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
    <AndroidUseSharedRuntime>False</AndroidUseSharedRuntime>
    <EmbedAssembliesIntoApk>True</EmbedAssembliesIntoApk>
    <Debugger>Xamarin</Debugger>
    <RunCodeAnalysis>false</RunCodeAnalysis>
    <AndroidSupportedAbis>armeabi-v7a</AndroidSupportedAbis>
    <AndroidEnableMultiDex>true</AndroidEnableMultiDex>
    <AotAssemblies>true</AotAssemblies>
    <EnableLLVM>true</EnableLLVM>
    <AndroidAotMode>Hybrid</AndroidAotMode>
    <AndroidEnableProfiledAot>false</AndroidEnableProfiledAot>
    <AndroidAotAdditionalArguments>no-write-symbols,nodebug</AndroidAotAdditionalArguments> 
    <AndroidDexTool>d8</AndroidDexTool>
    <AndroidLinkTool>r8</AndroidLinkTool>
    <AndroidEnableSGenConcurrent>true</AndroidEnableSGenConcurrent>
    <AndroidLinkMode>SdkOnly</AndroidLinkMode>
  </PropertyGroup>

Expected Behavior

.dll in the assemblies dir of the apk are stripped. App runs correctly.

Xamarin.Android.common.targets has a block that should do this when AOT and Hybrid is enabled.

   <CilStrip
	Condition=" '$(AndroidAotMode)' == 'Hybrid' And '$(AotAssemblies)' == 'True' "
	AndroidAotMode="$(AndroidAotMode)"
	ToolPath="$(_MonoAndroidToolsDirectory)"
	ApkOutputPath="$(_BuildApkEmbedOutputs)"
	ResolvedAssemblies="@(_ResolvedAssemblies)">
  </CilStrip> 

Actual Behavior

.dll in the assemblies dir of the apk are completely intact. App crashes

obj\InternalRelease\100\android\assets\shrunk has the method bodies stripped out but these don't make it into the final apk.

Partial work around

I changed Xamarin.Android.common.targets to use ResolvedAssemblies="@(_ShrunkAssemblies)".

   <CilStrip
	Condition=" '$(AndroidAotMode)' == 'Hybrid' And '$(AotAssemblies)' == 'True' "
	AndroidAotMode="$(AndroidAotMode)"
	ToolPath="$(_MonoAndroidToolsDirectory)"
	ApkOutputPath="$(_BuildApkEmbedOutputs)"
	ResolvedAssemblies="@(_ShrunkAssemblies)">
  </CilStrip> 

The stripped assemblies now end up in the apk but when I connect the debugger the app is crashing on launch due to:

06-11 16:19:08.557 E/AndroidRuntime(18806): java.lang.UnsatisfiedLinkError: No implementation found for void mono.android.TypeManager.n_activate(java.lang.String, java.lang.String, java.lang.Object, java.lang.Object[]) (tried Java_mono_android_TypeManager_n_1activate and Java_mono_android_TypeManager_n_1activate__Ljava_lang_String_2Ljava_lang_String_2Ljava_lang_Object_2_3Ljava_lang_Object_2)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at mono.android.TypeManager.n_activate(Native Method)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at mono.android.TypeManager.Activate(:7)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at crc64446c24ccf511bf5f.SplashScreenActivity.<init>(:25)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at java.lang.Class.newInstance(Native Method)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at android.app.Instrumentation.newActivity(Instrumentation.java:1086)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2809)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at android.app.ActivityThread.-wrap14(ActivityThread.java)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at android.os.Handler.dispatchMessage(Handler.java:102)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at android.os.Looper.loop(Looper.java:154)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at android.app.ActivityThread.main(ActivityThread.java:6682)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at java.lang.reflect.Method.invoke(Native Method)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
06-11 16:19:08.557 E/AndroidRuntime(18806): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)

Version Information

Microsoft Visual Studio Enterprise 2019 (2)
Version 16.6.1
VisualStudio.16.Release/16.6.1+30128.74
Microsoft .NET Framework
Version 4.8.03761

Installed Version: Enterprise

Azure App Service Tools v3.0.0 16.6.936.3669
Azure App Service Tools v3.0.0

C# Tools 3.6.0-4.20251.5+910223b64f108fcf039012e0849befb46ace6e66
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools 1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Extensibility Message Bus 1.2.0 (d16-2@8b56e20)
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.

IntelliCode Extension 1.0
IntelliCode Visual Studio Extension Detailed Info

JetBrains ReSharper Ultimate 2020.1.3 Build 201.0.20200515.122017
JetBrains ReSharper Ultimate package for Microsoft Visual Studio. For more information about ReSharper Ultimate, visit http://www.jetbrains.com/resharper. Copyright © 2020 JetBrains, Inc.

Microsoft JVM Debugger 1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft MI-Based Debugger 1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Mono Debugging for Visual Studio 16.6.17 (9692114)
Support for debugging Mono processes with Visual Studio.

NuGet Package Manager 5.6.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/

ProjectServicesPackage Extension 1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

Visual Basic Tools 3.6.0-4.20251.5+910223b64f108fcf039012e0849befb46ace6e66
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual F# Tools 10.9.1.0 for F# 4.7 16.6.0-beta.20217.4+1c969cac25e2d38d71872efe6c8226029e42bb59
Microsoft Visual F# Tools 10.9.1.0 for F# 4.7

Visual Studio Code Debug Adapter Host Package 1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

VisualStudio.DeviceLog 1.0
Information about my package

VisualStudio.Foo 1.0
Information about my package

VisualStudio.Mac 1.0
Mac Extension for Visual Studio

Xamarin 16.6.000.1061 (d16-6@8e68aa8)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer 16.6.0.318 (remotes/origin/d16-6@66afc5421)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.

Xamarin Templates 16.6.40 (1f1466f)
Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms.

Xamarin.Android SDK 10.3.1.4 (d16-6/3a10de9)
Xamarin.Android Reference Assemblies and MSBuild support.
Mono: 165f4b0
Java.Interop: xamarin/java.interop/d16-6@2cab35c
ProGuard: xamarin/proguard@905836d
SQLite: xamarin/sqlite@49232bc
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-6@bfb66f3

Xamarin.iOS and Xamarin.Mac SDK 13.18.2.1 (29c4ea7)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

Log File

BuildLogTargetsWorkAround.zip
BuildlogOriginalTargets.zip

[EDMIStephen]

obj\InternalRelease\100\android\assets\shrunk
and
obj\InternalRelease\100\android\assets\non-stripped
both have unstripped assemblies. I would have expected the \shrunk dir to have them stripped.

obj\InternalRelease\100\android\assets has the stripped versions.

[EDMIStephen]

Same issue with Enterprise 16.7.0 Preview 2.0. The shrunk assemblies do not make it into the apk. If we manually unpack the app and put the stripped versions back in we get

E/AndroidRuntime(18806): java.lang.UnsatisfiedLinkError: No implementation found for void mono.android.TypeManager.n_activate

[EDMIStephen]

Looks like others are having this issue too. https://forums.xamarin.com/discussion/182826/hybrid-aot
I urgently need a work around. Is there anything I can do to help try solve this. We have devs available. We just need to be given direction.

[EDMIStephen]

Visual Studio 16.3.10 and MSBuild 16.3.2+e481bbf88 builds an APK with the correctly shrunk .dll.
So somewhere between Nov 2019 and now Hybrid AOT has been broken.

Microsoft Visual Studio Enterprise 2019 (3)
Version 16.3.10
VisualStudio.16.Release/16.3.10+29519.87
Microsoft .NET Framework
Version 4.8.03761

Installed Version: Enterprise

Azure App Service Tools v3.0.0 16.3.286.43615
Azure App Service Tools v3.0.0

C# Tools 3.3.1-beta3-19461-02+2fd12c210e22f7d6245805c60340f6a34af6875b
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools 1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Extensibility Message Bus 1.2.0 (d16-2@8b56e20)
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.

IntelliCode Extension 1.0
IntelliCode Visual Studio Extension Detailed Info

Microsoft JVM Debugger 1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft MI-Based Debugger 1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Mono Debugging for Visual Studio 16.3.7 (9d260c5)
Support for debugging Mono processes with Visual Studio.

NuGet Package Manager 5.3.1
NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/

ProjectServicesPackage Extension 1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

Visual Basic Tools 3.3.1-beta3-19461-02+2fd12c210e22f7d6245805c60340f6a34af6875b
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual F# Tools 10.4 for F# 4.6 16.3.0-beta.19455.1+0422ff293bb2cc722fe5021b85ef50378a9af823
Microsoft Visual F# Tools 10.4 for F# 4.6

Visual Studio Code Debug Adapter Host Package 1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

VisualStudio.Mac 1.0
Mac Extension for Visual Studio

Xamarin 16.3.0.281 (d16-3@859f726)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer 16.3.0.256 (remotes/origin/d16-3@8a223bfd7)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.

Xamarin Templates 16.3.565 (27e9746)
Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms.

Xamarin.Android SDK 10.0.6.2 (d16-3/c407838)
Xamarin.Android Reference Assemblies and MSBuild support.
Mono: mono/mono@476d72b9e32
Java.Interop: xamarin/java.interop/d16-3@5836f58
LibZipSharp: grendello/LibZipSharp/d16-3@71f4a94
LibZip: nih-at/libzip@b95cf3fd
ProGuard: xamarin/proguard@905836d
SQLite: xamarin/sqlite@8212a2d
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-3@cb41333

Xamarin.iOS and Xamarin.Mac SDK 13.6.0.12 (e3c2b40)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

[EDMIStephen]

Maybe this is the culprit???
#3950