CLR hosting

CLR-Host-Notes.md

@@ -0,0 +1,14 @@
+# Notes
+
+## Potential optimizations
+
+  * https://github.com/dotnet/runtime/blob/9b24fb60a19f62620ca1fc5e4eb2e3ae0b3b086d/src/coreclr/binder/assemblybindercommon.cpp#L844-L889
+    * Managed C++ assemblies aren't available on Unix, no point in looking for them
+    * `candidates[]` is `WCHAR*`, while `ProbeAppBundle` takes UTF-8 - no point in doing the
+      conversion here
+  * Host contract
+    * It might make sense to pass strings as Unicode to host and back, to avoid conversions.
+      p/invoke names for instance, can be Unicode. So can be the assembly names. Native library
+      names should be UTF-8, but we can generate lookup tables for those at application build time
+      (e.g. indexed by an xxHash of the Unicode version of the name) - no conversion at run time.
+    * We need declarations of all he possible HRESULT errors (`S_OK` etc)

Configuration.props

@@ -56,16 +56,18 @@
     <MicrosoftAndroidSdkPackName Condition="$([MSBuild]::IsOSPlatform('osx'))">Microsoft.Android.Sdk.Darwin</MicrosoftAndroidSdkPackName>
   </PropertyGroup>
   <PropertyGroup>
+    <MicrosoftAndroidPacksRootDir>$(BuildOutputDirectory)lib\packs\</MicrosoftAndroidPacksRootDir>
     <AutoProvision Condition=" '$(AutoProvision)' == '' ">False</AutoProvision>
     <AutoProvisionUsesSudo Condition=" '$(AutoProvisionUsesSudo)' == '' ">False</AutoProvisionUsesSudo>
     <_XABinRelativeInstallPrefix>lib\xamarin.android</_XABinRelativeInstallPrefix>
     <XAInstallPrefix Condition=" '$(XAInstallPrefix)' == '' ">$(MSBuildThisFileDirectory)bin\$(Configuration)\$(_XABinRelativeInstallPrefix)\</XAInstallPrefix>
     <_MonoAndroidNETOutputRoot>$(XAInstallPrefix)xbuild-frameworks\Microsoft.Android\</_MonoAndroidNETOutputRoot>
     <_MonoAndroidNETDefaultOutDir>$(_MonoAndroidNETOutputRoot)$(AndroidApiLevel)\</_MonoAndroidNETDefaultOutDir>
-    <MicrosoftAndroidRefPackDir>$(BuildOutputDirectory)lib\packs\Microsoft.Android.Ref.$(AndroidApiLevel)\$(AndroidPackVersion)\ref\$(DotNetTargetFramework)\</MicrosoftAndroidRefPackDir>
-    <MicrosoftAndroidSdkPackDir>$(BuildOutputDirectory)lib\packs\$(MicrosoftAndroidSdkPackName)\$(AndroidPackVersion)\</MicrosoftAndroidSdkPackDir>
+    <NativeRuntimeOutputRootDir>$(BuildOutputDirectory)lib\runtimes\</NativeRuntimeOutputRootDir>
+    <MicrosoftAndroidRefPackDir>$(MicrosoftAndroidPacksRootDir)Microsoft.Android.Ref.$(AndroidApiLevel)\$(AndroidPackVersion)\ref\$(DotNetTargetFramework)\</MicrosoftAndroidRefPackDir>
+    <MicrosoftAndroidSdkPackDir>$(MicrosoftAndroidPacksRootDir)$(MicrosoftAndroidSdkPackName)\$(AndroidPackVersion)\</MicrosoftAndroidSdkPackDir>
     <MicrosoftAndroidSdkOutDir>$(MicrosoftAndroidSdkPackDir)\tools\</MicrosoftAndroidSdkOutDir>
-    <MicrosoftAndroidSdkAnalysisOutDir>$(BuildOutputDirectory)lib\packs\Microsoft.Android.Ref.$(AndroidLatestStableApiLevel)\$(AndroidPackVersion)\analyzers\dotnet\cs\</MicrosoftAndroidSdkAnalysisOutDir>
+    <MicrosoftAndroidSdkAnalysisOutDir>$(MicrosoftAndroidPacksRootDir)Microsoft.Android.Ref.$(AndroidLatestStableApiLevel)\$(AndroidPackVersion)\analyzers\dotnet\cs\</MicrosoftAndroidSdkAnalysisOutDir>
     <MakeConcurrency Condition=" '$(MakeConcurrency)' == '' And '$(HostCpuCount)' != '' ">-j$(HostCpuCount)</MakeConcurrency>
     <ManagedRuntime Condition=" '$(ManagedRuntime)' == '' And '$(OS)' != 'Windows_NT' ">mono</ManagedRuntime>
     <ManagedRuntimeArgs Condition=" '$(ManagedRuntimeArgs)' == '' And '$(ManagedRuntime)' == 'mono' ">--debug=casts</ManagedRuntimeArgs>
@@ -216,5 +218,11 @@
   <ItemGroup>
     <AndroidAbiAndRuntimeFlavor Include="@(AndroidSupportedTargetJitAbi)" AndroidRuntime="Mono" />
     <AndroidAbiAndRuntimeFlavor Include="@(AndroidSupportedTargetJitAbi)" AndroidRuntime="NativeAOT" />
+    <AndroidAbiAndRuntimeFlavor Include="@(AndroidSupportedTargetJitAbi)" AndroidRuntime="CoreCLR" />
   </ItemGroup>
+
+   <!-- TEMPORARY: to be removed once this PR is ready to be merged -->
+  <PropertyGroup>
+    <_LocalClrDirectory Condition=" Exists('$(AndroidToolchainDirectory)\clr') ">$(AndroidToolchainDirectory)\clr</_LocalClrDirectory>
+  </PropertyGroup>
 </Project>

Makefile

@@ -15,6 +15,7 @@ PREPARE_SCENARIO =
 PREPARE_CI_PR ?= 0
 PREPARE_CI ?= 0
 PREPARE_AUTOPROVISION ?= 0
+LOCAL_CLR ?=
 
 _PREPARE_CI_MODE_PR_ARGS = --no-emoji --run-mode=CI
 _PREPARE_CI_MODE_ARGS = $(_PREPARE_CI_MODE_PR_ARGS) -a
@@ -65,6 +66,10 @@ ifeq ($(XA_FORCE_COMPONENT_REFRESH),true)
 _PREPARE_ARGS += -refresh
 endif
 
+ifneq ($(LOCAL_CLR),)
+_PREPARE_ARGS += -p:_LocalClrDirectory="$(LOCAL_CLR)"
+endif
+
 _PREPARE_ARGS += $(PREPARE_ARGS)
 
 include build-tools/scripts/msbuild.mk

Xamarin.Android.sln

@@ -45,7 +45,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Java.Interop.Tools.Diagnost
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Java.Interop.Tools.Cecil", "external\Java.Interop\src\Java.Interop.Tools.Cecil\Java.Interop.Tools.Cecil.csproj", "{D48EE8D0-0A0A-4493-AEF5-DAF5F8CF86AD}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "native", "src\native\native.csproj", "{53EE4C57-1C03-405A-8243-8DA539546C88}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "native", "src\native\native-mono.csproj", "{53EE4C57-1C03-405A-8243-8DA539546C88}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Tests", "Tests", "{CAB438D8-B0F5-4AF0-BEBD-9E2ADBD7B483}"
 EndProject
@@ -125,6 +125,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.Android.Sdk.Analy
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "proguard-android", "src\proguard-android\proguard-android.csproj", "{5FD0133B-69E5-4474-9B67-9FD1D0150C70}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "native-clr", "src\native\native-clr.csproj", "{39F49484-872A-489D-8E6B-3BC532DD571D}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|AnyCPU = Debug|AnyCPU
@@ -347,6 +349,10 @@ Global
 		{5FD0133B-69E5-4474-9B67-9FD1D0150C70}.Debug|AnyCPU.Build.0 = Debug|Any CPU
 		{5FD0133B-69E5-4474-9B67-9FD1D0150C70}.Release|AnyCPU.ActiveCfg = Release|Any CPU
 		{5FD0133B-69E5-4474-9B67-9FD1D0150C70}.Release|AnyCPU.Build.0 = Release|Any CPU
+		{39F49484-872A-489D-8E6B-3BC532DD571D}.Debug|AnyCPU.ActiveCfg = Debug|Any CPU
+		{39F49484-872A-489D-8E6B-3BC532DD571D}.Debug|AnyCPU.Build.0 = Debug|Any CPU
+		{39F49484-872A-489D-8E6B-3BC532DD571D}.Release|AnyCPU.ActiveCfg = Release|Any CPU
+		{39F49484-872A-489D-8E6B-3BC532DD571D}.Release|AnyCPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -406,6 +412,7 @@ Global
 		{A39B6D7C-6616-40D6-8AE4-C6CEE93D2708} = {CAB438D8-B0F5-4AF0-BEBD-9E2ADBD7B483}
 		{5E806C9F-1B67-4B6B-A6AB-258834250DBB} = {FFCF518F-2A4A-40A2-9174-2EE13B76C723}
 		{5FD0133B-69E5-4474-9B67-9FD1D0150C70} = {FFCF518F-2A4A-40A2-9174-2EE13B76C723}
+		{39F49484-872A-489D-8E6B-3BC532DD571D} = {FFCF518F-2A4A-40A2-9174-2EE13B76C723}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {53A1F287-EFB2-4D97-A4BB-4A5E145613F6}

build-tools/create-packs/Microsoft.Android.Runtime.proj

@@ -31,6 +31,8 @@ projects that use the Microsoft.Android framework in .NET 6+.
       DependsOnTargets="_GetLicense">
     <PropertyGroup>
       <FrameworkListFile Condition="'$(FrameworkListFile)' == ''">$(IntermediateOutputPath)$(AndroidRID)\RuntimeList.xml</FrameworkListFile>
+      <_RuntimeFlavorDirName Condition=" '$(AndroidRuntime)' == 'CoreCLR' ">clr</_RuntimeFlavorDirName>
+      <_RuntimeFlavorDirName Condition=" '$(AndroidRuntime)' == 'Mono' Or '$(AndroidRuntime)' == '' ">mono</_RuntimeFlavorDirName>
     </PropertyGroup>
 
     <ItemGroup>
@@ -41,12 +43,27 @@ projects that use the Microsoft.Android framework in .NET 6+.
       <_AndroidRuntimePackAssemblies Include="$(_MonoAndroidNETOutputRoot)$(AndroidLatestStableApiLevel)\Mono.Android.Export.dll" />
     </ItemGroup>
 
+    <ItemGroup Condition=" '$(AndroidRuntime)' == 'CoreCLR' ">
+      <_AndroidRuntimePackAssets Condition=" Exists('$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libnet-android.debug.so') " Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libnet-android.debug.so" />
+      <_AndroidRuntimePackAssets Condition=" Exists('$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libnet-android.release.so') " Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libnet-android.release.so" />
+    </ItemGroup>
+
     <ItemGroup Condition=" '$(AndroidRuntime)' == 'Mono' ">
-      <_AndroidRuntimePackAssets Include="$(MicrosoftAndroidSdkOutDir)lib\$(AndroidRID)\libmono-android.debug.so" />
-      <_AndroidRuntimePackAssets Include="$(MicrosoftAndroidSdkOutDir)lib\$(AndroidRID)\libmono-android.release.so" />
-      <_AndroidRuntimePackAssets Include="$(MicrosoftAndroidSdkOutDir)lib\$(AndroidRID)\libxamarin-debug-app-helper.so" />
-      <_AndroidRuntimePackAssets Include="$(MicrosoftAndroidSdkOutDir)lib\$(AndroidRID)\libxamarin-native-tracing.so" />
-      <_AndroidRuntimePackAssets Include="$(MicrosoftAndroidSdkOutDir)lib\$(AndroidRID)\libunwind_xamarin.a" />
+      <_AndroidRuntimePackAssets Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libmono-android.debug.so" />
+      <_AndroidRuntimePackAssets Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libmono-android.release.so" />
+      <_AndroidRuntimePackAssets Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libxamarin-debug-app-helper.so" />
+      <_AndroidRuntimePackAssets Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libxamarin-native-tracing.so" />
+      <_AndroidRuntimePackAssets Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libunwind_xamarin.a" />
+    </ItemGroup>
+
+    <ItemGroup Condition=" '$(AndroidRuntime)' != 'NativeAOT' ">
+      <!-- TODO: the Exists() checks must go away once we build CoreCLR host for all the targets -->
+      <_AndroidRuntimePackAssets Condition=" Exists('$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libc.so') " Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libc.so" />
+      <_AndroidRuntimePackAssets Condition=" Exists('$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libdl.so') " Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libdl.so" />
+      <_AndroidRuntimePackAssets Condition=" Exists('$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\liblog.so') " Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\liblog.so" />
+      <_AndroidRuntimePackAssets Condition=" Exists('$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libm.so') " Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libm.so" />
+      <_AndroidRuntimePackAssets Condition=" Exists('$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libz.so') " Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libz.so" />
+      <_AndroidRuntimePackAssets Condition=" Exists('$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libarchive-dso-stub.so') " Include="$(NativeRuntimeOutputRootDir)$(_RuntimeFlavorDirName)\$(AndroidRID)\libarchive-dso-stub.so" />
     </ItemGroup>
 
     <ItemGroup>

build-tools/installers/create-installers.targets

@@ -134,6 +134,10 @@
     <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)java_runtime_fastdev_net6.jar" ExcludeFromLegacy="true" />
     <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)java_runtime_net6.dex" ExcludeFromLegacy="true" />
     <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)java_runtime_fastdev_net6.dex" ExcludeFromLegacy="true" />
+    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)java_runtime_clr.jar" ExcludeFromLegacy="true" />
+    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)java_runtime_fastdev_clr.jar" ExcludeFromLegacy="true" />
+    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)java_runtime_clr.dex" ExcludeFromLegacy="true" />
+    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)java_runtime_fastdev_clr.dex" ExcludeFromLegacy="true" />
     <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)manifestmerger.jar" />
     <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)proguard-android.txt" />
     <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)protobuf-net.dll" />
@@ -176,18 +180,6 @@
     <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)K4os.Compression.LZ4.dll" />
     <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)ELFSharp.dll" />
     <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)ManifestOverlays\Timing.xml" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)libstubs\android-arm64\libc.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)libstubs\android-arm64\libm.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)libstubs\android-arm\libc.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)libstubs\android-arm\libm.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)libstubs\android-x64\libc.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)libstubs\android-x64\libm.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)libstubs\android-x86\libc.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)libstubs\android-x86\libm.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)dsostubs\android-arm64\libarchive-dso-stub.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)dsostubs\android-arm\libarchive-dso-stub.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)dsostubs\android-x64\libarchive-dso-stub.so" />
-    <_MSBuildFiles Include="$(MicrosoftAndroidSdkOutDir)dsostubs\android-x86\libarchive-dso-stub.so" />
   </ItemGroup>
   <ItemGroup>
     <_MSBuildTargetsSrcFiles Include="$(MSBuildTargetsSrcDir)\Xamarin.Android.AvailableItems.targets" />

build-tools/scripts/xa_build_configuration.cmake.in

@@ -2,3 +2,8 @@ set(NETCORE_APP_RUNTIME_DIR_ARM "@NETCORE_APP_RUNTIME_ANDROID_ARM@")
 set(NETCORE_APP_RUNTIME_DIR_ARM64 "@NETCORE_APP_RUNTIME_ANDROID_ARM64@")
 set(NETCORE_APP_RUNTIME_DIR_X86 "@NETCORE_APP_RUNTIME_ANDROID_X86@")
 set(NETCORE_APP_RUNTIME_DIR_X86_64 "@NETCORE_APP_RUNTIME_ANDROID_X86_64@")
+
+set(CORECLR_APP_RUNTIME_DIR_ARM "@CORECLR_APP_RUNTIME_ANDROID_ARM@")
+set(CORECLR_APP_RUNTIME_DIR_ARM64 "@CORECLR_APP_RUNTIME_ANDROID_ARM64@")
+set(CORECLR_APP_RUNTIME_DIR_X86 "@CORECLR_APP_RUNTIME_ANDROID_X86@")
+set(CORECLR_APP_RUNTIME_DIR_X86_64 "@CORECLR_APP_RUNTIME_ANDROID_X86_64@")

build-tools/xaprepare/xaprepare/Application/KnownProperties.cs

@@ -39,6 +39,7 @@ static class KnownProperties
 		public const string JavaSdkDirectory                    = "JavaSdkDirectory";
 		public const string JdkIncludePath                      = "JdkIncludePath";
 		public const string LibZipSourceFullPath                = "LibZipSourceFullPath";
+		public const string LocalClrDirectory                   = "_LocalClrDirectory";
 		public const string ManagedRuntime                      = "ManagedRuntime";
 		public const string MicrosoftAndroidSdkOutDir           = "MicrosoftAndroidSdkOutDir";
 		public const string MonoCecilVersion                    = "MonoCecilVersion";

build-tools/xaprepare/xaprepare/Application/Properties.Defaults.cs.in

@@ -43,6 +43,7 @@ namespace Xamarin.Android.Prepare
 			properties.Add (KnownProperties.JavaSdkDirectory,                    StripQuotes (@"@JavaSdkDirectory@"));
 			properties.Add (KnownProperties.JdkIncludePath,                      StripQuotes (@"@JdkIncludePath@"));
 			properties.Add (KnownProperties.LibZipSourceFullPath,                StripQuotes (@"@LibZipSourceFullPath@"));
+            properties.Add (KnownProperties.LocalClrDirectory,                   StripQuotes (@"@_LocalClrDirectory@"));
 			properties.Add (KnownProperties.ManagedRuntime,                      StripQuotes (@"@ManagedRuntime@"));
 			properties.Add (KnownProperties.MicrosoftAndroidSdkOutDir,           StripQuotes (@"@MicrosoftAndroidSdkOutDir@"));
 			properties.Add (KnownProperties.MonoCecilVersion,                    StripQuotes ("@MonoCecilVersion@"));

build-tools/xaprepare/xaprepare/ConfigAndData/Configurables.cs

@@ -191,12 +191,18 @@ public static partial class Paths
 			public static string OpenJDKInstallDir                   => GetCachedPath (ref openJDKInstallDir, ()                   => Path.Combine (ctx.Properties.GetRequiredValue (KnownProperties.AndroidToolchainDirectory), Defaults.JdkFolder));
 			public static string OpenJDKCacheDir                     => GetCachedPath (ref openJDKCacheDir, ()                     => ctx.Properties.GetRequiredValue (KnownProperties.AndroidToolchainCacheDirectory));
 
-			// .NET 6
+			// .NET 6+
 			public static string NetcoreAppRuntimeAndroidARM         => GetCachedPath (ref netcoreAppRuntimeAndroidARM, () => GetNetcoreAppRuntimePath (ctx, "arm"));
 			public static string NetcoreAppRuntimeAndroidARM64       => GetCachedPath (ref netcoreAppRuntimeAndroidARM64, () => GetNetcoreAppRuntimePath (ctx, "arm64"));
 			public static string NetcoreAppRuntimeAndroidX86         => GetCachedPath (ref netcoreAppRuntimeAndroidX86, () => GetNetcoreAppRuntimePath (ctx, "x86"));
 			public static string NetcoreAppRuntimeAndroidX86_64      => GetCachedPath (ref netcoreAppRuntimeAndroidX86_64, () => GetNetcoreAppRuntimePath (ctx, "x64"));
 
+			// CoreCLR
+			public static string CoreClrAppRuntimeAndroidARM         => GetCachedPath (ref coreclrAppRuntimeAndroidARM, () => GetCoreClrAppRuntimePath (ctx, "arm"));
+			public static string CoreClrAppRuntimeAndroidARM64       => GetCachedPath (ref coreclrAppRuntimeAndroidARM64, () => GetCoreClrAppRuntimePath (ctx, "arm64"));
+			public static string CoreClrAppRuntimeAndroidX86         => GetCachedPath (ref coreclrAppRuntimeAndroidX86, () => GetCoreClrAppRuntimePath (ctx, "x86"));
+			public static string CoreClrAppRuntimeAndroidX86_64      => GetCachedPath (ref coreclrAppRuntimeAndroidX86_64, () => GetCoreClrAppRuntimePath (ctx, "x64"));
+
 			public static string MicrosoftNETWorkloadMonoPackageDir => Path.Combine (
 				XAPackagesDir,
 				$"microsoft.net.workload.mono.toolchain.{{0}}.manifest-{ctx.Properties.GetRequiredValue (KnownProperties.DotNetMonoManifestVersionBand)}",
@@ -242,6 +248,24 @@ static string GetNetcoreAppRuntimePath (Context ctx, string androidTarget)
 				);
 			}
 
+			static string GetCoreClrAppRuntimePath (Context ctx, string androidTarget)
+			{
+				string? localClrDir = ctx.Properties.GetValue (KnownProperties.LocalClrDirectory);
+				if (!String.IsNullOrEmpty (localClrDir)) {
+					return Path.Combine (localClrDir, "runtimes", $"android-{androidTarget}");
+				}
+
+				// TODO: The nuget id and the ref package version are guesses atm, since the CoreCLR packages don't exist yet
+				Log.Instance.Todo ("The nuget id and the ref package version are guesses atm, since the CoreCLR packages don't exist yet");
+				return Path.Combine (
+					XAPackagesDir,
+					$"microsoft.netcore.app.runtime.coreclr.android-{androidTarget}",
+					ctx.Properties.GetRequiredValue (KnownProperties.MicrosoftNETCoreAppRefPackageVersion),
+					"runtimes",
+					$"android-{androidTarget}"
+				);
+			}
+
 			static string EnsureAndroidToolchainBinDirectories ()
 			{
 				if (androidToolchainBinDirectory != null)
@@ -278,6 +302,10 @@ static string GetCachedPath (ref string? variable, Func<string> creator)
 			static string? netcoreAppRuntimeAndroidARM64;
 			static string? netcoreAppRuntimeAndroidX86;
 			static string? netcoreAppRuntimeAndroidX86_64;
+			static string? coreclrAppRuntimeAndroidARM;
+			static string? coreclrAppRuntimeAndroidARM64;
+			static string? coreclrAppRuntimeAndroidX86;
+			static string? coreclrAppRuntimeAndroidX86_64;
 		}
 	}
 }