Build.proj

<Project Sdk="Microsoft.Build.Traversal">

  <ItemGroup>
    <!-- Subsets are already imported by Directory.Build.props. -->
    <ProjectReference Include="@(ProjectToBuild)" />
    <!-- Only include tasks.proj during restore and build incrementally via a target. -->
    <ProjectReference Include="$(RepoTasksDir)tasks.proj" Condition="'$(MSBuildRestoreSessionId)' != ''" />
  </ItemGroup>

  <Import Project="$(RepositoryEngineeringDir)SubsetValidation.targets" />
  <Import Project="$(RepositoryEngineeringDir)restore\optimizationData.targets" Condition="'$(DotNetBuildSourceOnly)' != 'true'" />

  <Target Name="BuildLocalTasks"
          BeforeTargets="Build">
    <MSBuild Projects="$(RepoTasksDir)tasks.proj"
             Targets="BuildIncrementally" />
  </Target>

  <Target Name="SetupBootstrapLayout"
          AfterTargets="Build"
          Condition="'$(Subset)' == 'bootstrap'">
    <ItemGroup>
      <AotSdkFile
        Include="$(CoreCLRAotSdkDir)/*"
        Condition="'$(UseNativeAotForComponents)' == 'true'" />
      <AppHostFile
        Include="$([MSBuild]::NormalizePath('$(DotNetHostBinDir)', 'apphost$(ExeSuffix)'))" />
      <AppHostFile
        Include="$([MSBuild]::NormalizePath('$(CoreCLRArtifactsPath)', 'corehost', 'singlefilehost$(ExeSuffix)'))"
        Condition="'$(UseNativeAotForComponents)' != 'true'" />
      <RefPackFile Include="$(MicrosoftNetCoreAppRefPackDir)/**/*" />
      <RuntimePackFile Include="$(MicrosoftNetCoreAppRuntimePackDir)/**/*" />
      <RidGraphFile Include="$(ArtifactsBinDir)Microsoft.NETCore.Platforms/*.json" />

      <AotSdkFile
        DestinationPath="$(BootstrapAotSdkDir)/%(Filename)%(Extension)" />
      <AppHostFile
        DestinationPath="$(BootstrapHostDir)/%(Filename)%(Extension)" />
      <RefPackFile
        DestinationPath="$(BootstrapRefPackDir)/%(RecursiveDir)%(Filename)%(Extension)" />
      <RuntimePackFile
        DestinationPath="$(BootstrapRuntimePackDir)/%(RecursiveDir)%(Filename)%(Extension)" />
      <RidGraphFile
        DestinationPath="$(BootstrapRidGraphDir)/%(RecursiveDir)%(Filename)%(Extension)" />
      <BootstrapFile Include="@(AotSdkFile);@(AppHostFile);@(RefPackFile);@(RuntimePackFile);@(RidGraphFile)" />
    </ItemGroup>

    <Copy
      SourceFiles="@(BootstrapFile)"
      DestinationFiles="@(BootstrapFile->Metadata('DestinationPath'))"
      SkipUnchangedFiles="true" />
    <Message Importance="high" Text="Bootstrap files copied to $(ArtifactsDir)bootstrap" />
  </Target>
</Project>