ReferenceAssemblies.props

<Project>
  <PropertyGroup>
    <IsReferenceAssembly Condition="'$(IsReferenceAssembly)'=='' AND ($(MSBuildProjectFullPath.Contains('\ref\')) OR $(MSBuildProjectFullPath.Contains('/ref/')))">true</IsReferenceAssembly>

    <!-- Create a common root output directory for all reference assemblies -->
    <ReferenceAssemblyOutputPath Condition="'$(ReferenceAssemblyOutputPath)' == ''">$(ArtifactsBinDir)ref/</ReferenceAssemblyOutputPath>
  </PropertyGroup>

  <PropertyGroup Condition="'$(IsReferenceAssembly)'=='true'">
    <OutputPath>$(ReferenceAssemblyOutputPath)$(MSBuildProjectName)/$(Configuration)</OutputPath>
    <IntermediateOutputPath>$(ArtifactsObjDir)ref/$(MSBuildProjectName)/$(Configuration)</IntermediateOutputPath>

    <!-- disable warnings about unused fields -->
    <NoWarn>$(NoWarn);0169;0649</NoWarn>
  </PropertyGroup>

  <ItemGroup Condition="'$(IsReferenceAssembly)'=='true'">
    <!-- All reference assemblies should have the 0x70 flag which prevents them from loading
         and the ReferenceAssemblyAttribute. -->
    <AssemblyInfoLines Include="[assembly:System.Runtime.CompilerServices.ReferenceAssembly]" />
    <AssemblyInfoLines Include="[assembly:System.Reflection.AssemblyFlags((System.Reflection.AssemblyNameFlags)0x70)]" />
  </ItemGroup>
</Project>