Linux-bionic (Android libc w/o Android interop) initial implementation (

dotnet#66147)

Implement support for "Linux Bionic", a RID which builds a Linux runtime against an Android libc but without Android OS functions like JNI, Dalvik, Instrumentation, etc. This configuration has been requested by a team working on an IoT scenario.

* The new RID is linux-bionic-arm64/linux-bionic-x64.
* The build reuses the existing Android build dockerfiles and Helix queues
* Since we don't have JNI, we don't have Android Crypto - instead, use an Android build of OpenSSL. As an errata, it is incumbent upon the end user to supply this in their OS environment (we download one ad-hoc for testing purposes, which was compiled by Google)
* Some tests cannot be completed due to SELinux policies affecting the shell user executing tests via adb shell in the world-writable /data/local/tmp directory. We expect those tests would pass if they pass on Android, in a real-world IoT scenario with a custom OS (rather than recycling Google's OS images intended for phones)

Closes: dotnet#66027

Directory.Build.props

@@ -22,6 +22,7 @@
     <TargetOS Condition="'$(TargetOS)' == ''">$(_hostOS)</TargetOS>
     <TargetsMobile Condition="'$(TargetOS)' == 'iOS' or '$(TargetOS)' == 'iOSSimulator' or '$(TargetOS)' == 'MacCatalyst' or '$(TargetOS)' == 'tvOS' or '$(TargetOS)' == 'tvOSSimulator' or '$(TargetOS)' == 'Android' or '$(TargetOS)' == 'Browser'">true</TargetsMobile>
     <TargetsAppleMobile Condition="'$(TargetOS)' == 'iOS' or '$(TargetOS)' == 'iOSSimulator' or '$(TargetOS)' == 'MacCatalyst' or '$(TargetOS)' == 'tvOS' or '$(TargetOS)' == 'tvOSSimulator'">true</TargetsAppleMobile>
+    <TargetsLinuxBionic Condition="$(OutputRid.StartsWith('linux-bionic'))">true</TargetsLinuxBionic>
   </PropertyGroup>
 
   <!-- Platform property is required by RepoLayout.props in Arcade SDK. -->
@@ -145,6 +146,7 @@
 
     <_portableOS>linux</_portableOS>
     <_portableOS Condition="'$(_runtimeOS)' == 'linux-musl'">linux-musl</_portableOS>
+    <_portableOS Condition="'$(_runtimeOS)' == 'linux-bionic'">linux-bionic</_portableOS>
     <_portableOS Condition="'$(_hostOS)' == 'OSX'">osx</_portableOS>
     <_portableOS Condition="'$(_runtimeOS)' == 'win' or '$(TargetOS)' == 'windows'">win</_portableOS>
     <_portableOS Condition="'$(_runtimeOS)' == 'FreeBSD' or '$(TargetOS)' == 'FreeBSD'">freebsd</_portableOS>
@@ -178,9 +180,9 @@
     <_toolsRID Condition="'$(_runtimeOS)' == 'browser' and '$(HostOS)' == 'osx'">osx-x64</_toolsRID>
 
     <!-- There are no Android tools, so use the default ones -->
-    <_toolsRID Condition="'$(_runtimeOS)' == 'android'">linux-x64</_toolsRID>
-    <_toolsRID Condition="'$(_runtimeOS)' == 'android' and '$(HostOS)' == 'windows'">win-x64</_toolsRID>
-    <_toolsRID Condition="'$(_runtimeOS)' == 'android' and '$(HostOS)' == 'osx'">osx-x64</_toolsRID>
+    <_toolsRID Condition="'$(_runtimeOS)' == 'android' or '$(_runtimeOS)' == 'linux-bionic'">linux-x64</_toolsRID>
+    <_toolsRID Condition="('$(_runtimeOS)' == 'android' or '$(_runtimeOS)' == 'linux-bionic') and '$(HostOS)' == 'windows'">win-x64</_toolsRID>
+    <_toolsRID Condition="('$(_runtimeOS)' == 'android' or '$(_runtimeOS)' == 'linux-bionic') and '$(HostOS)' == 'osx'">osx-x64</_toolsRID>
 
     <!-- There are no Mac Catalyst, iOS or tvOS tools and it can be built on OSX only, so use that -->
     <_toolsRID Condition="'$(_runtimeOS)' == 'maccatalyst' or '$(_runtimeOS)' == 'ios' or '$(_runtimeOS)' == 'iOSSimulator' or '$(_runtimeOS)' == 'tvos' or '$(_runtimeOS)' == 'tvOSSimulator'">osx-x64</_toolsRID>

eng/Subsets.props

@@ -27,12 +27,13 @@
        flavor is used to decide when to build the hosts and installers. -->
   <PropertyGroup>
     <PrimaryRuntimeFlavor>CoreCLR</PrimaryRuntimeFlavor>
-    <PrimaryRuntimeFlavor Condition="'$(TargetArchitecture)' == 's390x' or '$(TargetArchitecture)' == 'armv6'">Mono</PrimaryRuntimeFlavor>
+    <PrimaryRuntimeFlavor Condition="'$(TargetArchitecture)' == 's390x' or '$(TargetArchitecture)' == 'armv6' or '$(TargetsLinuxBionic)' == 'true'">Mono</PrimaryRuntimeFlavor>
   </PropertyGroup>
 
   <PropertyGroup>
     <DefaultSubsets>clr+mono+libs+host+packs</DefaultSubsets>
     <DefaultSubsets Condition="'$(TargetsMobile)' == 'true'">mono+libs+packs</DefaultSubsets>
+    <DefaultSubsets Condition="'$(TargetsLinuxBionic)' == 'true'">mono+libs+host+packs</DefaultSubsets>
     <!-- In source build, mono is only supported as primary runtime flavor. On Windows mono is supported for x86/x64 only. -->
     <DefaultSubsets Condition="('$(DotNetBuildFromSource)' == 'true' and '$(PrimaryRuntimeFlavor)' != 'Mono') or ('$(TargetOS)' == 'windows' and '$(TargetArchitecture)' != 'x86' and '$(TargetArchitecture)' != 'x64')">clr+libs+host+packs</DefaultSubsets>
   </PropertyGroup>
@@ -330,7 +331,7 @@
   </ItemGroup>
 
   <!-- Mono sets -->
-  <ItemGroup Condition="$(_subset.Contains('+mono.llvm+')) or $(_subset.Contains('+mono.aotcross+')) or '$(TargetOS)' == 'iOS' or '$(TargetOS)' == 'iOSSimulator' or '$(TargetOS)' == 'tvOS' or '$(TargetOS)' == 'tvOSSimulator' or '$(TargetOS)' == 'MacCatalyst' or '$(TargetOS)' == 'Android' or '$(TargetOS)' == 'Browser'">
+  <ItemGroup Condition="$(_subset.Contains('+mono.llvm+')) or $(_subset.Contains('+mono.aotcross+')) or '$(TargetOS)' == 'iOS' or '$(TargetOS)' == 'iOSSimulator' or '$(TargetOS)' == 'tvOS' or '$(TargetOS)' == 'tvOSSimulator' or '$(TargetOS)' == 'MacCatalyst' or '$(TargetOS)' == 'Android' or '$(TargetOS)' == 'Browser' or '$(TargetsLinuxBionic)' == 'true'">
     <ProjectToBuild Include="$(MonoProjectRoot)llvm\llvm-init.proj" Category="mono" />
   </ItemGroup>
 

eng/Version.Details.xml

@@ -242,17 +242,17 @@
       <Uri>https://github.com/dotnet/linker</Uri>
       <Sha>6aaa900a0b1268fe4a6ce3e8af4678e84ea154fd</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.XHarness.TestRunners.Common" Version="1.0.0-prerelease.22256.2">
+    <Dependency Name="Microsoft.DotNet.XHarness.TestRunners.Common" Version="1.0.0-prerelease.22261.2">
       <Uri>https://github.com/dotnet/xharness</Uri>
-      <Sha>79dc54a9932d26ad0deaf82562b48c4bc8fd525a</Sha>
+      <Sha>9f147c42bc2934a160e51df98e5f4da9b752a7f5</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.XHarness.TestRunners.Xunit" Version="1.0.0-prerelease.22256.2">
+    <Dependency Name="Microsoft.DotNet.XHarness.TestRunners.Xunit" Version="1.0.0-prerelease.22261.2">
       <Uri>https://github.com/dotnet/xharness</Uri>
-      <Sha>79dc54a9932d26ad0deaf82562b48c4bc8fd525a</Sha>
+      <Sha>9f147c42bc2934a160e51df98e5f4da9b752a7f5</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.XHarness.CLI" Version="1.0.0-prerelease.22256.2">
+    <Dependency Name="Microsoft.DotNet.XHarness.CLI" Version="1.0.0-prerelease.22261.2">
       <Uri>https://github.com/dotnet/xharness</Uri>
-      <Sha>79dc54a9932d26ad0deaf82562b48c4bc8fd525a</Sha>
+      <Sha>9f147c42bc2934a160e51df98e5f4da9b752a7f5</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.PackageTesting" Version="7.0.0-beta.22255.2">
       <Uri>https://github.com/dotnet/arcade</Uri>

eng/Versions.props

@@ -150,9 +150,9 @@
     <!-- Testing -->
     <MicrosoftNETCoreCoreDisToolsVersion>1.1.0</MicrosoftNETCoreCoreDisToolsVersion>
     <MicrosoftNETTestSdkVersion>16.9.0-preview-20201201-01</MicrosoftNETTestSdkVersion>
-    <MicrosoftDotNetXHarnessTestRunnersCommonVersion>1.0.0-prerelease.22256.2</MicrosoftDotNetXHarnessTestRunnersCommonVersion>
-    <MicrosoftDotNetXHarnessTestRunnersXunitVersion>1.0.0-prerelease.22256.2</MicrosoftDotNetXHarnessTestRunnersXunitVersion>
-    <MicrosoftDotNetXHarnessCLIVersion>1.0.0-prerelease.22256.2</MicrosoftDotNetXHarnessCLIVersion>
+    <MicrosoftDotNetXHarnessTestRunnersCommonVersion>1.0.0-prerelease.22261.2</MicrosoftDotNetXHarnessTestRunnersCommonVersion>
+    <MicrosoftDotNetXHarnessTestRunnersXunitVersion>1.0.0-prerelease.22261.2</MicrosoftDotNetXHarnessTestRunnersXunitVersion>
+    <MicrosoftDotNetXHarnessCLIVersion>1.0.0-prerelease.22261.2</MicrosoftDotNetXHarnessCLIVersion>
     <MicrosoftDotNetHotReloadUtilsGeneratorBuildToolVersion>1.1.0-alpha.0.22259.2</MicrosoftDotNetHotReloadUtilsGeneratorBuildToolVersion>
     <XUnitVersion>2.4.2-pre.22</XUnitVersion>
     <XUnitAnalyzersVersion>0.12.0-pre.20</XUnitAnalyzersVersion>

eng/native/build-commons.sh

@@ -78,7 +78,7 @@ build_native()
         cmakeArgs="-DCMAKE_SYSTEM_VARIANT=MacCatalyst $cmakeArgs"
     fi
 
-    if [[ "$targetOS" == Android && -z "$ROOTFS_DIR" ]]; then
+    if [[ ( "$targetOS" == Android || "$targetOS" == linux-bionic ) && -z "$ROOTFS_DIR" ]]; then
         if [[ -z "$ANDROID_NDK_ROOT" ]]; then
             echo "Error: You need to set the ANDROID_NDK_ROOT environment variable pointing to the Android NDK root."
             exit 1

eng/native/init-distro-rid.sh

@@ -168,6 +168,8 @@ initDistroRidGlobal()
         if [ -z "${distroRid}" ]; then
             if [ "$targetOs" = "Linux" ]; then
                 distroRid="linux-$buildArch"
+            elif [ "$targetOs" = "linux-bionic" ]; then
+                distroRid="linux-bionic-$buildArch"
             elif [ "$targetOs" = "OSX" ]; then
                 distroRid="osx-$buildArch"
             elif [ "$targetOs" = "MacCatalyst" ]; then

eng/pipelines/common/global-build-job.yml

@@ -79,6 +79,10 @@ jobs:
         - name: _osParameter
           value: /p:RuntimeOS=linux-musl /p:OutputRid=linux-musl-${{ parameters.archType }}
 
+      - ${{ if and(eq(parameters.osGroup, 'Linux'), eq(parameters.osSubGroup, '_bionic')) }}:
+        - name: _osParameter
+          value: /p:RuntimeOS=linux-bionic /p:OutputRid=linux-bionic-${{ parameters.archType }}
+
       # Do not rename as it clashes with MSBuild property in libraries/build-native.proj
       - name: _crossBuildPropertyArg
         value: /p:CrossBuild=${{ parameters.crossBuild }}
@@ -156,7 +160,7 @@ jobs:
 
     # Build
     - ${{ if eq(parameters.buildingOnSourceBuildImage, false) }}:
-      - script: $(_sclEnableCommand) $(Build.SourcesDirectory)$(dir)build$(scriptExt) -ci -arch ${{ parameters.archType }} $(_osParameter) ${{ parameters.buildArgs }} $(_officialBuildParameter) $(_crossBuildPropertyArg) $(_cxx11Parameter) $(_richCodeNavigationParam) $(_buildDarwinFrameworksParameter)
+      - script: $(_sclEnableCommand) $(Build.SourcesDirectory)$(dir)build$(scriptExt) -ci -arch ${{ parameters.archType }} $(_osParameter) ${{ parameters.buildArgs }} $(_officialBuildParameter) $(_crossBuildPropertyArg) $(_cxx11Parameter) $(_richCodeNavigationParam) $(_buildDarwinFrameworksParameter) $(_overrideTestScriptWindowsCmdParameter)
         displayName: Build product
         ${{ if eq(parameters.useContinueOnErrorDuringBuild, true) }}:
           continueOnError: ${{ parameters.shouldContinueOnError }}

eng/pipelines/common/platform-matrix.yml

@@ -185,6 +185,59 @@ jobs:
         crossrootfsDir: '/crossrootfs/arm64'
         ${{ insert }}: ${{ parameters.jobParameters }}
 
+# Linux Bionic arm64
+
+- ${{ if containsValue(parameters.platforms, 'Linux_bionic_arm64') }}:
+  - template: xplat-setup.yml
+    parameters:
+      jobTemplate: ${{ parameters.jobTemplate }}
+      helixQueuesTemplate: ${{ parameters.helixQueuesTemplate }}
+      variables: ${{ parameters.variables }}
+      osGroup: Linux
+      osSubgroup: _bionic
+      archType: arm64
+      targetRid: linux-bionic-arm64
+      platform: Linux_bionic_arm64
+      container:
+        image: ubuntu-18.04-android-20220131172314-3983b4e
+        registry: mcr
+      jobParameters:
+        runtimeFlavor: mono
+        # We build on Linux, but the test queue runs Windows, so
+        # we need to override the test script generation
+        runScriptWindowsCmd: true
+        stagedBuild: ${{ parameters.stagedBuild }}
+        buildConfig: ${{ parameters.buildConfig }}
+        ${{ if eq(parameters.passPlatforms, true) }}:
+          platforms: ${{ parameters.platforms }}
+        helixQueueGroup: ${{ parameters.helixQueueGroup }}
+        ${{ insert }}: ${{ parameters.jobParameters }}
+
+# Linux Bionic x64
+
+- ${{ if containsValue(parameters.platforms, 'Linux_bionic_x64') }}:
+  - template: xplat-setup.yml
+    parameters:
+      jobTemplate: ${{ parameters.jobTemplate }}
+      helixQueuesTemplate: ${{ parameters.helixQueuesTemplate }}
+      variables: ${{ parameters.variables }}
+      osGroup: Linux
+      osSubgroup: _bionic
+      archType: x64
+      targetRid: linux-bionic-x64
+      platform: Linux_bionic_x64
+      container:
+        image: ubuntu-18.04-android-20220131172314-3983b4e
+        registry: mcr
+      jobParameters:
+        runtimeFlavor: mono
+        stagedBuild: ${{ parameters.stagedBuild }}
+        buildConfig: ${{ parameters.buildConfig }}
+        ${{ if eq(parameters.passPlatforms, true) }}:
+          platforms: ${{ parameters.platforms }}
+        helixQueueGroup: ${{ parameters.helixQueueGroup }}
+        ${{ insert }}: ${{ parameters.jobParameters }}
+
 # Linux x64
 
 - ${{ if or(containsValue(parameters.platforms, 'Linux_x64'), containsValue(parameters.platforms, 'CoreClrTestBuildHost'), in(parameters.platformGroup, 'all', 'gcstress')) }}:

eng/pipelines/common/xplat-setup.yml

@@ -46,6 +46,12 @@ jobs:
       - name: _runSmokeTestsOnlyArg
         value: '/p:RunSmokeTestsOnly=$(isRunSmokeTestsOnly)'
 
+      - name: _overrideTestScriptWindowsCmdParameter
+        ${{ if eq(parameters.jobParameters.runScriptWindowsCmd, true) }}:
+          value: '/p:RunScriptWindowsCmd=true'
+        ${{ if ne(parameters.jobParameters.runScriptWindowsCmd, true) }}:
+          value: ''
+
       - name: _hostedOs
         value: ${{ parameters.jobParameters.hostedOs }}
 

eng/pipelines/libraries/helix-queues-setup.yml

@@ -96,9 +96,9 @@ jobs:
       - OSX.1200.Amd64.Open
 
     # Android
-    - ${{ if in(parameters.platform, 'Android_x86', 'Android_x64') }}:
+    - ${{ if in(parameters.platform, 'Android_x86', 'Android_x64', 'Linux_bionic_x64') }}:
       - Ubuntu.1804.Amd64.Android.29.Open
-    - ${{ if in(parameters.platform, 'Android_arm', 'Android_arm64') }}:
+    - ${{ if in(parameters.platform, 'Android_arm', 'Android_arm64', 'Linux_bionic_arm64') }}:
       - Windows.10.Amd64.Android.Open
 
     # iOS Simulator/Mac Catalyst arm64

eng/pipelines/runtime-staging.yml

@@ -173,6 +173,47 @@ jobs:
           creator: dotnet-bot
           testRunNamePrefixSuffix: Mono_$(_BuildConfig)
 
+#
+# Build the whole product using Mono for Android Linux with Bionic libc
+#
+- template: /eng/pipelines/common/platform-matrix.yml
+  parameters:
+    jobTemplate: /eng/pipelines/common/global-build-job.yml
+    helixQueuesTemplate: /eng/pipelines/libraries/helix-queues-setup.yml
+    buildConfig: Release
+    runtimeFlavor: mono
+    platforms:
+      - Linux_bionic_arm64
+      - Linux_bionic_x64
+    variables:
+      - ${{ if and(eq(variables['System.TeamProject'], 'public'), eq(variables['Build.Reason'], 'PullRequest')) }}:
+        - name: _HelixSource
+          value: pr/dotnet/runtime/$(Build.SourceBranch)
+      - ${{ if and(eq(variables['System.TeamProject'], 'public'), ne(variables['Build.Reason'], 'PullRequest')) }}:
+        - name: _HelixSource
+          value: ci/dotnet/runtime/$(Build.SourceBranch)
+      - name: timeoutPerTestInMinutes
+        value: 60
+      - name: timeoutPerTestCollectionInMinutes
+        value: 180
+    jobParameters:
+      testGroup: innerloop
+      targetRid: Linux-bionic-x64
+      nameSuffix: AllSubsets_Mono
+      buildArgs: -s mono+libs+host+packs+libs.tests -c $(_BuildConfig) /p:ArchiveTests=true
+      timeoutInMinutes: 240
+      condition: >-
+        or(
+          eq(dependencies.evaluate_paths.outputs['SetPathVars_libraries.containsChange'], true),
+          eq(dependencies.evaluate_paths.outputs['SetPathVars_mono.containsChange'], true),
+          eq(dependencies.evaluate_paths.outputs['SetPathVars_installer.containsChange'], true),
+          eq(variables['isRollingBuild'], true))
+      # extra steps, run tests
+      extraStepsTemplate: /eng/pipelines/libraries/helix.yml
+      extraStepsParameters:
+        creator: dotnet-bot
+        testRunNamePrefixSuffix: Mono_$(_BuildConfig)_LinuxBionic
+
 #
 # Build the whole product using Mono for Android and run runtime tests with Android devices
 #

eng/targetingpacks.targets

@@ -31,7 +31,7 @@
                              LatestRuntimeFrameworkVersion="$(ProductVersion)"
                              RuntimeFrameworkName="$(LocalFrameworkOverrideName)"
                              RuntimePackNamePatterns="$(LocalFrameworkOverrideName).Runtime.**RID**"
-                             RuntimePackRuntimeIdentifiers="linux-arm;linux-arm64;linux-musl-arm64;linux-loongarch64;linux-musl-x64;linux-x64;osx-x64;rhel.6-x64;tizen.4.0.0-armel;tizen.5.0.0-armel;win-arm;win-arm64;win-x64;win-x86;linux-musl-arm;osx-arm64;maccatalyst-x64;maccatalyst-arm64"
+                             RuntimePackRuntimeIdentifiers="linux-arm;linux-arm64;linux-musl-arm64;linux-bionic-arm64;linux-loongarch64;linux-musl-x64;linux-bionic-x64;linux-x64;osx-x64;rhel.6-x64;tizen.4.0.0-armel;tizen.5.0.0-armel;win-arm;win-arm64;win-x64;win-x86;linux-musl-arm;osx-arm64;maccatalyst-x64;maccatalyst-arm64"
                              TargetFramework="$(NetCoreAppCurrent)"
                              TargetingPackName="$(LocalFrameworkOverrideName).Ref"
                              TargetingPackVersion="$(ProductVersion)"
@@ -41,13 +41,13 @@
                       RuntimeFrameworkName="$(LocalFrameworkOverrideName)"
                       LatestRuntimeFrameworkVersion="$(ProductVersion)"
                       RuntimePackNamePatterns="$(LocalFrameworkOverrideName).Runtime.Mono.**RID**"
-                      RuntimePackRuntimeIdentifiers="linux-arm;linux-armv6;linux-arm64;linux-musl-arm64;linux-loongarch64;linux-musl-x64;linux-x64;osx-x64;rhel.6-x64;win-arm;win-arm64;win-x64;win-x86;linux-musl-arm;osx-arm64;maccatalyst-x64;maccatalyst-arm64;browser-wasm;ios-arm64;ios-arm;iossimulator-arm64;iossimulator-x64;iossimulator-x86;tvos-arm64;tvossimulator-arm64;tvossimulator-x64;android-arm64;android-arm;android-x64;android-x86"
+                      RuntimePackRuntimeIdentifiers="linux-arm;linux-armv6;linux-arm64;linux-musl-arm64;linux-bionic-arm64;linux-loongarch64;linux-musl-x64;linux-bionic-x64;linux-x64;osx-x64;rhel.6-x64;win-arm;win-arm64;win-x64;win-x86;linux-musl-arm;osx-arm64;maccatalyst-x64;maccatalyst-arm64;browser-wasm;ios-arm64;ios-arm;iossimulator-arm64;iossimulator-x64;iossimulator-x86;tvos-arm64;tvossimulator-arm64;tvossimulator-x64;android-arm64;android-arm;android-x64;android-x86"
                       RuntimePackLabels="Mono"
                       Condition="'@(KnownRuntimePack)' == '' or !@(KnownRuntimePack->AnyHaveMetadataValue('TargetFramework', '$(NetCoreAppCurrent)'))"/>
     <KnownAppHostPack Include="$(LocalFrameworkOverrideName)"
                       AppHostPackNamePattern="$(LocalFrameworkOverrideName).Host.**RID**"
                       AppHostPackVersion="$([MSBuild]::ValueOrDefault('$(_AppHostBaselinePackVersion)', '$(ProductVersion)'))"
-                      AppHostRuntimeIdentifiers="linux-arm;linux-armv6;linux-arm64;linux-musl-arm64;linux-loongarch64;linux-musl-x64;linux-x64;osx-x64;rhel.6-x64;tizen.4.0.0-armel;tizen.5.0.0-armel;win-arm;win-arm64;win-x64;win-x86;linux-musl-arm;osx-arm64"
+                      AppHostRuntimeIdentifiers="linux-arm;linux-armv6;linux-arm64;linux-musl-arm64;linux-bionic-arm64;linux-loongarch64;linux-musl-x64;linux-bionic-x64;linux-x64;osx-x64;rhel.6-x64;tizen.4.0.0-armel;tizen.5.0.0-armel;win-arm;win-arm64;win-x64;win-x86;linux-musl-arm;osx-arm64"
                       TargetFramework="$(NetCoreAppCurrent)"
                       Condition="'@(KnownAppHostPack)' == '' or !@(KnownAppHostPack->AnyHaveMetadataValue('TargetFramework', '$(NetCoreAppCurrent)'))" />
     <KnownCrossgen2Pack Include="$(LocalFrameworkOverrideName).Crossgen2"