aspnetcore/eng/targets/ReferenceAssembly.targets

<Project>

  <Target Name="GenerateReferenceSource" Condition=" $(HasReferenceAssembly) ">
    <PropertyGroup>
      <_RefSourceOutputPath>$([System.IO.Directory]::GetParent('$(MSBuildProjectDirectory)'))/ref/</_RefSourceOutputPath>
      <_RefProjectFileOutputPath>$(_RefSourceOutputPath)$(AssemblyName).csproj</_RefProjectFileOutputPath>
    </PropertyGroup>

    <ItemGroup>
      <_AllTargetFrameworks Remove="@(_AllTargetFrameworks)" />
      <_AllTargetFrameworks Include="$(TargetFrameworks);$(TargetFramework)" />
      <_DeduplicatedTargetFramework Include="%(_AllTargetFrameworks.Identity)" />
    </ItemGroup>

    <MSBuild Projects="$(MSBuildProjectFullPath)"
        Targets="_GenerateProjectSourceInner"
        Properties="TargetFramework=%(_DeduplicatedTargetFramework.Identity);CompileUsingReferenceAssemblies=false">
      <Output TaskParameter="TargetOutputs" ItemName="ProjectListContentItem" />
    </MSBuild>

    <ItemGroup>
      <_ResultTargetFramework Include="%(ProjectListContentItem.TargetFramework)" />
    </ItemGroup>

    <PropertyGroup>
      <_TargetFrameworkOverride />
      <_TargetFrameworkOverride
          Condition=" @(_ResultTargetFramework->Count()) > 1 ">%0A    &lt;TargetFrameworks Condition="'%24(DotNetBuildFromSource)' == 'true'"&gt;%24(DefaultNetCoreTargetFramework)&lt;/TargetFrameworks&gt;</_TargetFrameworkOverride>
      <_NullableProperty Condition="'$(Nullable)' != ''">%0A    &lt;Nullable&gt;annotations&lt;/Nullable&gt;</_NullableProperty>
      <ProjectListContentLines><![CDATA[
<!-- This file is automatically generated. -->
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFrameworks>@(_ResultTargetFramework)</TargetFrameworks>$(_TargetFrameworkOverride)$(_NullableProperty)
  </PropertyGroup>
  @(ProjectListContentItem->'%(Identity)', '%0A')
</Project>
]]></ProjectListContentLines>
    </PropertyGroup>

    <WriteLinesToFile File="$(_RefProjectFileOutputPath)"
        Lines="$([MSBuild]::Escape($(ProjectListContentLines)))"
        Overwrite="true" />

    <Message Importance="High" Text="Generated $(_RefProjectFileOutputPath)" />
  </Target>

  <Target Name="_GenerateProjectSourceInner"
      Returns="@(ProjectListContent)"
      DependsOnTargets="Build"
      Condition=" '$(TargetFrameworkIdentifier)' != '.NETFramework' ">
    <PropertyGroup>
      <_RefSourceFileTFM>$(TargetFramework)</_RefSourceFileTFM>
      <_RefSourceFileTFM Condition="'$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND
          $([MSBuild]::VersionGreaterThanOrEquals($(TargetFrameworkVersion), '5.0'))">netcoreapp</_RefSourceFileTFM>
      <_RefProjectFileTFM>$(TargetFramework)</_RefProjectFileTFM>
      <_RefProjectFileTFM Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">%24(DefaultNetCoreTargetFramework)</_RefProjectFileTFM>

      <_RefSourceOutputPath>$([System.IO.Directory]::GetParent('$(MSBuildProjectDirectory)'))/ref/</_RefSourceOutputPath>
      <_RefSourceFileName>$(AssemblyName).$(_RefSourceFileTFM).cs</_RefSourceFileName>
      <_ManualRefSourceFileName>$(AssemblyName).Manual.cs</_ManualRefSourceFileName>
      <_PerTFMManualRefSourceFileName>$(AssemblyName).$(_RefSourceFileTFM).Manual.cs</_PerTFMManualRefSourceFileName>
      <_RefSourceFileOutputPath>$(_RefSourceOutputPath)$(_RefSourceFileName)</_RefSourceFileOutputPath>
    </PropertyGroup>

    <ItemGroup>
      <_ReferenceDirectoriesWithDuplicates Include="@(ReferencePath->'%(RootDir)%(Directory)'->TrimEnd('\'))" />
      <_ReferencePathDirectories Include="%(_ReferenceDirectoriesWithDuplicates.Identity)" />
    </ItemGroup>

    <PropertyGroup>
      <_GenApiFile>$([MSBuild]::NormalizePath('$(ArtifactsDir)', 'log', 'GenAPI.rsp'))</_GenApiFile>
      <_GenAPICommand
          Condition="'$(MSBuildRuntimeType)' == 'core'">"$(DotNetTool)" --roll-forward-on-no-candidate-fx 2 "$(_GenAPIPath)"</_GenAPICommand>
      <_GenAPICmd>$(_GenAPICommand) @"$(_GenApiFile)"</_GenAPICmd>
      <_GenAPICmd
          Condition=" '$(AdditionalGenApiCmdOptions)' != '' ">$(_GenAPICmd) $(AdditionalGenApiCmdOptions)</_GenAPICmd>
      <_GenApiArguments><![CDATA[
"$(TargetPath)"
--lib-path "@(_ReferencePathDirectories, '%3B')"
--out "$(_RefSourceFileOutputPath)"
--header-file "$(RepoRoot)/eng/LicenseHeader.txt"
--exclude-api-list "$(RepoRoot)/eng/GenAPI.exclusions.txt"
]]>
      </_GenApiArguments>
    </PropertyGroup>

    <WriteLinesToFile File="$(_GenApiFile)" Lines="$(_GenApiArguments)" Overwrite="true" />

    <MakeDir Directories="$(_RefSourceOutputPath)" />
    <Message Importance="High" Text="Generating $(_RefSourceFileOutputPath)" />
    <Exec Command="$(_GenAPICmd)" />

    <ItemGroup>
      <_ReferenceAssemblyCompileItems Include="$(_RefSourceFileName)" />
      <_ReferenceAssemblyCompileItems Include="$(_ManualRefSourceFileName)"
          Condition="Exists('$(_RefSourceOutputPath)$(_ManualRefSourceFileName)')" />
      <_ReferenceAssemblyCompileItems Include="$(_PerTFMManualRefSourceFileName)"
          Condition="Exists('$(_RefSourceOutputPath)$(_PerTFMManualRefSourceFileName)')" />
      <_ReferenceAssemblyCompileItems Include="../src/AssemblyInfo.cs"
          Condition="Exists('$(MSBuildProjectDirectory)/AssemblyInfo.cs')" />
      <_ReferenceAssemblyCompileItems Include="../src/Properties/AssemblyInfo.cs"
          Condition="Exists('$(MSBuildProjectDirectory)/Properties/AssemblyInfo.cs')" />
      <FilteredOriginalReferences Include="%(_OriginalReferences.Identity)"
          Condition="'%(_OriginalReferences.NuGetPackageId)' == '' AND '%(_OriginalReferences.PrivateAssets)' != 'All'" />

      <_ReferenceAssemblyItems
          Include="@(_ReferenceAssemblyCompileItems->'&lt;Compile Include=&quot;%(Identity)&quot; /&gt;')" />
      <_ReferenceAssemblyItems
          Include="@(FilteredOriginalReferences->'&lt;Reference Include=&quot;%(Identity)&quot; /&gt;')"
          Condition=" '@(FilteredOriginalReferences)' != '' " />
      <!-- Some src/ projects use Arcade SDK feature to generate InternalsVisibleTo attributes. -->
      <_ReferenceAssemblyItems
          Include="@(InternalsVisibleTo->'&lt;InternalsVisibleTo Include=&quot;%(Identity)&quot; Key=&quot;%(Key)&quot; /&gt;')"
          Condition=" '@(InternalsVisibleTo)' != '' " />
    </ItemGroup>

    <PropertyGroup>
      <ReferencesContent>
      <![CDATA[
  <ItemGroup Condition="'%24(TargetFramework)' == '$(_RefProjectFileTFM)'">
    @(_ReferenceAssemblyItems, '%0A    ')
  </ItemGroup>
]]>
      </ReferencesContent>
    </PropertyGroup>

    <ItemGroup>
      <ProjectListContent Include="$(ReferencesContent)" TargetFramework="$(_RefProjectFileTFM)" />
    </ItemGroup>
  </Target>

</Project>