<?xml version="1.0"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
    <!-- We allow a non-C# generator be set by the user, but skip adding outputs to Compile in this case. -->
    <Protobuf_Generator Condition=" '$(Protobuf_Generator)' == '' and '$(Language)' == 'C#' ">CSharp</Protobuf_Generator>
    <!-- Configuration is passing the smoke test. -->
    <Protobuf_ProjectSupported Condition=" '$(Protobuf_Generator)' != '' ">true</Protobuf_ProjectSupported>
    <_Protobuf_MsBuildAssembly Condition=" '$(MSBuildRuntimeType)' == 'Core' ">netstandard1.3\Protobuf.MSBuild.dll</_Protobuf_MsBuildAssembly>
    <_Protobuf_MsBuildAssembly Condition=" '$(MSBuildRuntimeType)' != 'Core' ">net45\Protobuf.MSBuild.dll</_Protobuf_MsBuildAssembly>
  </PropertyGroup>

  <UsingTask AssemblyFile="$(_Protobuf_MsBuildAssembly)" TaskName="Grpc.Tools.ProtoToolsPlatform" />
  <UsingTask AssemblyFile="$(_Protobuf_MsBuildAssembly)" TaskName="Grpc.Tools.ProtoCompilerOutputs" />
  <UsingTask AssemblyFile="$(_Protobuf_MsBuildAssembly)" TaskName="Grpc.Tools.ProtoReadDependencies" />
  <UsingTask AssemblyFile="$(_Protobuf_MsBuildAssembly)" TaskName="Grpc.Tools.ProtoCompile" />

  <PropertyGroup Condition=" '$(Protobuf_ProjectSupported)' == 'true' ">
    <Protobuf_IntermediatePath Condition=" '$(Protobuf_IntermediatePath)' == '' ">$(IntermediateOutputPath)</Protobuf_IntermediatePath>
    <Protobuf_OutputPath Condition=" '$(Protobuf_OutputPath)' == '' ">$(Protobuf_IntermediatePath)</Protobuf_OutputPath>
    <Protobuf_DepFilesPath Condition=" '$(Protobuf_DepFilesPath)' == '' ">$(Protobuf_IntermediatePath)</Protobuf_DepFilesPath>
  </PropertyGroup>

  <ItemDefinitionGroup Condition=" '$(Protobuf_ProjectSupported)' == 'true' and '$(Language)' == 'C#' ">
    <Protobuf>
      <Access Condition="'%(Protobuf.Access)' == '' ">Public</Access>
      <ProtoCompile Condition="'%(Protobuf.ProtoCompile)' == '' ">True</ProtoCompile>
      <ProtoRoot Condition="'%(Protobuf.ProtoRoot)' == '' " />
      <CompileOutputs Condition="'%(Protobuf.CompileOutputs)' == ''">True</CompileOutputs>
      <OutputDir Condition="'%(Protobuf.OutputDir)' == '' ">$(Protobuf_OutputPath)</OutputDir>
      <Generator Condition="'%(Protobuf.Generator)' == '' and '$(DisableProtobufDesignTimeBuild)' != 'true' " >MSBuild:Compile</Generator>
    </Protobuf>
  </ItemDefinitionGroup>

  <ItemGroup Condition=" '$(Protobuf_ProjectSupported)' == 'true' and '$(Language)' == 'C#' ">
    <PropertyPageSchema Include="$(MSBuildThisFileDirectory)Protobuf.CSharp.xml">
      <Context>File;BrowseObject</Context>
    </PropertyPageSchema>
    <AvailableItemName Include="Protobuf" />
  </ItemGroup>

  <PropertyGroup>
    <!-- NET SDK: by default, do not include proto files in the directory.
         Current Microsoft's recommendation is against globbing:
         https://docs.microsoft.com/en-us/dotnet/core/tools/csproj#recommendation -->
    <EnableDefaultProtobufItems Condition=" '$(EnableDefaultProtobufItems)' == '' ">false</EnableDefaultProtobufItems>
  </PropertyGroup>

  <!-- Check configuration sanity before build. -->
  <Target Name="_Protobuf_SanityCheck" BeforeTargets="PrepareForBuild">
    <Error
      Condition=" '$(Protobuf_ProjectSupported)' != 'true' "
      Text="Google.Protobuf.Tools proto compilation is only supported by default in a C# project (extension .csproj)" />
  </Target>

  <!--================================================================================
                                     Tool path resolution
   =================================================================================-->

  <!-- Extension point for plugin packages: use Protobuf_ToolsOs and Protobuf_ToolsCpu
       to resolve executable. Either or both may be blank, however, if resolution
       fails; do check them before using. -->
  <Target Name="Protobuf_ResolvePlatform">
    <ProtoToolsPlatform>
      <Output TaskParameter="Os" PropertyName="_Protobuf_ToolsOs"/>
      <Output TaskParameter="Cpu" PropertyName="_Protobuf_ToolsCpu"/>
    </ProtoToolsPlatform>

    <PropertyGroup>
      <!-- First try environment variable. -->
      <Protobuf_ToolsOs Condition=" '$(Protobuf_ToolsOs)' == '' ">$(PROTOBUF_TOOLS_OS)</Protobuf_ToolsOs>
      <Protobuf_ToolsCpu Condition=" '$(Protobuf_ToolsCpu)' == '' ">$(PROTOBUF_TOOLS_CPU)</Protobuf_ToolsCpu>
      <Protobuf_ProtocFullPath Condition=" '$(Protobuf_ProtocFullPath)' == '' ">$(PROTOBUF_PROTOC)</Protobuf_ProtocFullPath>

      <!-- Next try OS and CPU resolved by ProtoToolsPlatform. -->
      <Protobuf_ToolsOs Condition=" '$(Protobuf_ToolsOs)' == '' ">$(_Protobuf_ToolsOs)</Protobuf_ToolsOs>
      <Protobuf_ToolsCpu Condition=" '$(Protobuf_ToolsCpu)' == '' ">$(_Protobuf_ToolsCpu)</Protobuf_ToolsCpu>
      <Protobuf_ProtocFullPath Condition=" '$(Protobuf_ProtocFullPath)' == '' and '$(Protobuf_ToolsOs)' == 'windows' "
           >$(Protobuf_PackagedToolsPath)\$(Protobuf_ToolsOs)_$(Protobuf_ToolsCpu)\protoc.exe</Protobuf_ProtocFullPath>
      <Protobuf_ProtocFullPath Condition=" '$(Protobuf_ProtocFullPath)' == '' "
           >$(Protobuf_PackagedToolsPath)/$(Protobuf_ToolsOs)_$(Protobuf_ToolsCpu)/protoc</Protobuf_ProtocFullPath>
    </PropertyGroup>

    <Error Condition=" '$(DisableProtobufDesignTimeBuild)' != 'true' and '$(PROTOBUF_PROTOC)' == ''
                        and ( '$(Protobuf_ToolsOs)' == '' or '$(Protobuf_ToolsCpu)' == '' ) "
      Text="Google.Protobuf.Tools cannot determine host OS and CPU.&#10;Use environment variables PROTOBUF_TOOLS_OS={linux|macosx|windows} and PROTOBUF_TOOLS_CPU={x86|x64} to try the closest match to your system.&#10;You may also set PROTOBUF_PROTOC to specify full path to the host-provided compiler (v3.5+ is required)." />
  </Target>

  <!--================================================================================
                                     Proto compilation
   =================================================================================-->

  <!-- Extension points. -->
  <Target Name="Protobuf_BeforeCompile" />
  <Target Name="Protobuf_AfterCompile" />

  <!-- Main compile sequence. Certain steps are gated by the value $(DisableProtobufDesignTimeBuild),
       so the sequence is good for either design time or build time. -->
  <Target Name="Protobuf_Compile"
          Condition=" '@(Protobuf)' != '' "
          DependsOnTargets=" Protobuf_BeforeCompile;
                             Protobuf_ResolvePlatform;
                             _Protobuf_SelectFiles;
                             Protobuf_PrepareCompile;
                             _Protobuf_AugmentLanguageCompile;
                             _Protobuf_CoreCompile;
                             Protobuf_ReconcileOutputs;
                             Protobuf_AfterCompile" />

  <!-- Do proto compilation by default in a C# project. In other types, the user invoke
       Protobuf_Compile directly where required. -->
  <!-- TODO(kkm): Do shared compile in outer multitarget project? -->
  <Target Name="_Protobuf_Compile_BeforeCsCompile"
          BeforeTargets="BeforeCompile"
          DependsOnTargets="Protobuf_Compile"
          Condition=" '$(Language)' == 'C#' " />

  <Target Name="_Protobuf_SetProtoRoot">
    <!-- Guess .proto root for the files. Whenever the root is set for a file explicitly,
         leave it as is. Otherwise, for files under the project directory, set the root
         to "." for the project's directory, as it is the current when compiling; for the
         files outside of project directory, use each .proto file's directory as the root. -->
    <FindUnderPath Path="$(MSBuildProjectDirectory)"
                   Files="@(Protobuf->WithMetadataValue('ProtoRoot',''))">
      <Output TaskParameter="InPath" ItemName="_Protobuf_NoRootInProject"/>
      <Output TaskParameter="OutOfPath" ItemName="_Protobuf_NoRootElsewhere"/>
    </FindUnderPath>
    <ItemGroup>
      <!-- Files with explicit metadata. -->
      <Protobuf_Rooted Include="@(Protobuf->HasMetadata('ProtoRoot'))" />
      <!-- In-project files will have ProtoRoot='.'. -->
      <Protobuf_Rooted Include="@(_Protobuf_NoRootInProject)">
        <ProtoRoot>.</ProtoRoot>
      </Protobuf_Rooted>
      <!-- Out-of-project files will have respective ProtoRoot='%(RelativeDir)'. -->
      <Protobuf_Rooted Include="@(_Protobuf_NoRootElsewhere)">
        <ProtoRoot>%(RelativeDir)</ProtoRoot>
        <ProtoRoot Condition=" '$(Protobuf_ProtoRoot)' != '' ">$(Protobuf_ProtoRoot)</ProtoRoot>
      </Protobuf_Rooted>
    </ItemGroup>
  </Target>

  <!-- Select files that should be compiled. -->
  <Target Name="_Protobuf_SelectFiles"
          DependsOnTargets=" _Protobuf_SetProtoRoot">
    <ItemGroup>
      <!-- Files with explicit metadata. -->
      <Protobuf_Compile Include="@(Protobuf_Rooted)" />
      <!-- Remove files not for compile. -->
      <Protobuf_Compile Remove="@(Protobuf_Compile)" Condition=" '%(ProtoCompile)' != 'true' " />
      <!-- Ensure invariant Source=%(Identity). -->
      <Protobuf_Compile>
        <Source>%(Identity)</Source>
      </Protobuf_Compile>
    </ItemGroup>
  </Target>

  <!-- Extension point for non-C# project. Protobuf_Generator should be supported
       by the ProtoCompile task, but we skip inferring expected outputs. All proto
       files will be always recompiled with a warning, unless you add expectations
       to the Protobuf_ExpectedOutputs collection.

       All inferred ExpectedOutputs will be added to code compile (C#) in a C# project
       by default. This is controlled per-proto by the CompileOutputs metadata. -->
  <Target Name="Protobuf_PrepareCompile" Condition=" '@(Protobuf_Compile)' != '' ">
    <!-- Predict expected names. -->
    <ProtoCompilerOutputs Condition=" '$(Language)' == 'C#' "
                          Protobuf="@(Protobuf_Compile)"
                          Generator="$(Protobuf_Generator)">
      <Output TaskParameter="PossibleOutputs" ItemName="Protobuf_ExpectedOutputs" />
      <Output TaskParameter="PatchedProtobuf" ItemName="_PatchedProtobuf" />
    </ProtoCompilerOutputs>
    <!-- Replace Protobuf_Compile with PatchedProtobuf. -->
    <ItemGroup>
       <Protobuf_Compile Remove="@(_PatchedProtobuf)"/>
       <Protobuf_Compile Include ="@(_PatchedProtobuf)"/>
    </ItemGroup>
    <!-- Read any dependency files from previous compiles. -->
    <ProtoReadDependencies Condition=" '$(Protobuf_DepFilesPath)' != '' and '$(DisableProtobufDesignTimeBuild)' != 'true' "
                           Protobuf="@(Protobuf_Compile)"
                           ProtoDepDir="$(Protobuf_DepFilesPath)" >
      <Output TaskParameter="Dependencies" ItemName="Protobuf_Dependencies" />
    </ProtoReadDependencies>
  </Target>

  <!-- Add all expected outputs, and only these, to language compile.  -->
  <Target Name="_Protobuf_AugmentLanguageCompile"
          DependsOnTargets="_Protobuf_EnforceInvariants"
          Condition=" '$(Language)' == 'C#' ">
    <ItemGroup>
      <_Protobuf_CodeCompile Include="@(Protobuf_ExpectedOutputs->Distinct())"
         Condition=" '%(Source)' != '' and '@(Protobuf_Compile->WithMetadataValue('CompileOutputs', 'true'))' != '' " />
      <Compile Include="@(_Protobuf_CodeCompile)" />
    </ItemGroup>
  </Target>

  <!-- These invariants must be kept for compile up-to-date check to work. -->
  <Target Name="_Protobuf_EnforceInvariants">
    <!-- Enforce Source=Identity on proto files. The 'Source' metadata is used as a common
         key to match dependencies/expected outputs in the lists for up-to-date checks. -->
    <ItemGroup>
      <Protobuf_Compile>
        <Source>%(Identity)</Source>
      </Protobuf_Compile>
    </ItemGroup>

    <!-- Remove possible output and dependency declarations that have no Source set, or those
         not matching any proto marked for compilation. -->
    <ItemGroup>
      <Protobuf_ExpectedOutputs Remove="@(Protobuf_ExpectedOutputs)" Condition=" '%(Protobuf_ExpectedOutputs.Source)' == '' " />
      <Protobuf_ExpectedOutputs Remove="@(Protobuf_ExpectedOutputs)" Condition=" '%(Source)' != '' and '@(Protobuf_Compile)' == '' " />
      <Protobuf_Dependencies Remove="@(Protobuf_Dependencies)" Condition=" '%(Protobuf_Dependencies.Source)' == '' " />
      <Protobuf_Dependencies Remove="@(Protobuf_Dependencies)" Condition=" '%(Source)' != '' and '@(Protobuf_Compile)' == '' " />
    </ItemGroup>
  </Target>

  <!-- Gather files with and without known outputs, separately. -->
  <Target Name="_Protobuf_GatherStaleFiles"
          Condition=" '@(Protobuf_Compile)' != '' "
          DependsOnTargets="_Protobuf_EnforceInvariants; _Protobuf_GatherStaleSimple; _Protobuf_GatherStaleBatched">
    <ItemGroup>
      <!-- Drop outputs from MSBuild inference (they won't have the '_Exec' metadata).  -->
      <_Protobuf_OutOfDateProto Remove="@(_Protobuf_OutOfDateProto->WithMetadataValue('_Exec',''))" />
    </ItemGroup>
  </Target>

  <Target Name="_Protobuf_GatherStaleSimple">
    <!-- Simple selection: always compile files that have no declared outputs (but warn below). -->
    <ItemGroup>
      <_Protobuf_OutOfDateProto Include="@(Protobuf_Compile)"
                                Condition = " '%(Source)' != '' and '@(Protobuf_ExpectedOutputs)' == '' ">
        <_Exec>true</_Exec>
      </_Protobuf_OutOfDateProto>
    </ItemGroup>

    <!-- You are seeing this warning because there was no Protobuf_ExpectedOutputs items with
         their Source attribute pointing to the proto files listed in the warning. Such files
         will be recompiled on every build, as there is nothing to run up-to-date check against.
         Set Protobuf_NoOrphanWarning to 'true' to suppress if this is what you want. -->
    <Warning Condition=" '@(_Protobuf_OutOfDateProto)' != '' and '$(Protobuf_NoOrphanWarning)' != 'true' "
             Text="The following files have no known outputs, and will be always recompiled as if out-of-date:&#10;@(_Protobuf_Orphans->'&#10;    %(Identity)', '')" />
  </Target>

  <Target Name="_Protobuf_GatherStaleBatched"
          Inputs="@(Protobuf_Compile);%(Source);@(Protobuf_Dependencies);$(MSBuildAllProjects)"
          Outputs="@(Protobuf_ExpectedOutputs)" >
    <!-- The '_Exec' metadatum is set to distinguish really executed items from those MSBuild so
         "helpfully" infers in a bucketed task. For the same reason, cannot use the intrinsic
         ItemGroup task here. -->
    <CreateItem Include="@(Protobuf_Compile)" AdditionalMetadata="_Exec=true">
      <Output TaskParameter="Include" ItemName="_Protobuf_OutOfDateProto"/>
    </CreateItem>
  </Target>

  <!-- Extension point: Plugins massage metadata into recognized metadata
       values passed to the ProtoCompile task. -->
  <Target Name="Protobuf_PrepareCompileOptions" Condition=" '@(Protobuf_Compile)' != '' ">
    <ItemGroup>
      <Protobuf_Compile>
        <_OutputOptions Condition=" '%(Protobuf_Compile.Access)' == 'Internal' ">%(Protobuf_Compile._OutputOptions);internal_access</_OutputOptions>
      </Protobuf_Compile>
    </ItemGroup>
  </Target>

  <Target Name="_Protobuf_CoreCompile"
          Condition=" '$(DisableProtobufDesignTimeBuild)' != 'true' "
          DependsOnTargets="Protobuf_PrepareCompileOptions;_Protobuf_GatherStaleFiles">
    <!-- Ensure output directories. -->
    <MakeDir Directories="%(_Protobuf_OutOfDateProto.OutputDir)" />
    <MakeDir Directories="%(_Protobuf_OutOfDateProto.GrpcOutputDir)" />
    <MakeDir Directories="$(Protobuf_DepFilesPath)" />

    <!-- Force output to the current directory if the user has set it to empty. -->
    <ItemGroup>
      <_Protobuf_OutOfDateProto>
        <OutputDir Condition=" '%(OutputDir)' == '' ">.</OutputDir>
      </_Protobuf_OutOfDateProto>
    </ItemGroup>

    <ProtoCompile Condition=" '@(_Protobuf_OutOfDateProto)' != '' "
      ToolExe="$(Protobuf_ProtocFullPath)"
      Generator="$(Protobuf_Generator)"
      Protobuf="%(_Protobuf_OutOfDateProto.Source)"
      ProtoPath="%(_Protobuf_OutOfDateProto.AdditionalImportDirs);$(Protobuf_StandardImportsPath);%(_Protobuf_OutOfDateProto.ProtoRoot)"
      ProtoDepDir="$(Protobuf_DepFilesPath)"
      OutputDir="%(_Protobuf_OutOfDateProto.OutputDir)"
      OutputOptions="%(_Protobuf_OutOfDateProto._OutputOptions)"
      GrpcPluginExe="%(_Protobuf_OutOfDateProto.GrpcPluginExe)"
      GrpcOutputDir="%(_Protobuf_OutOfDateProto.GrpcOutputDir)"
      GrpcOutputOptions="%(_Protobuf_OutOfDateProto._GrpcOutputOptions)"
    >
      <Output TaskParameter="GeneratedFiles" ItemName="_Protobuf_GeneratedFiles"/>
    </ProtoCompile>

    <!-- Compute files expected but not in fact produced by protoc. -->
    <ItemGroup Condition=" '@(_Protobuf_OutOfDateProto)' != '' ">
      <Protobuf_ExpectedNotGenerated Include="@(Protobuf_ExpectedOutputs)"
                                     Condition=" '%(Source)' != '' and '@(_Protobuf_OutOfDateProto)' != '' " />
      <Protobuf_ExpectedNotGenerated Remove="@(_Protobuf_GeneratedFiles)" />
    </ItemGroup>
  </Target>

  <!-- Extension point. Plugins and/or unsupported projects may take special care of the
       Protobuf_ExpectedNotGenerated list in BeforeTargets. We just silently create the
       missing outputs so that out-of-date checks work (we do not add them to language
       compile though). You can empty this collection in your Before targets to do nothing.
       The target is not executed if the proto compiler is not executed. -->
  <Target Name="Protobuf_ReconcileOutputs"
          Condition=" '$(DisableProtobufDesignTimeBuild)' != 'true' ">
    <!-- Warn about unexpected/missing files outside object file directory only.
         This should have happened because build was incorrectly customized. -->
    <FindUnderPath Path="$(BaseIntermediateOutputPath)" Files="@(Protobuf_ExpectedNotGenerated)">
      <Output TaskParameter="InPath" ItemName="_Protobuf_ExpectedNotGeneratedInTemp"/>
      <Output TaskParameter="OutOfPath" ItemName="_Protobuf_ExpectedNotGeneratedElsewhere"/>
    </FindUnderPath>

    <!-- Prevent unnecessary recompilation by silently creating empty files. This probably
         has happened because a proto file with an rpc service was processed by the gRPC
         plugin, and the user did not set GrpcOutput to None. When we treat outputs as
         transient, we can do it permissively. -->
    <Touch Files="@(_Protobuf_ExpectedNotGeneratedInTemp)" AlwaysCreate="true" />

    <!-- Also create empty files outside of the intermediate directory, if the user wants so. -->
    <Touch Files="@(_Protobuf_ExpectedNotGeneratedElsewhere)" AlwaysCreate="true"
           Condition=" '$(Protobuf_TouchMissingExpected)' == 'true' "/>

    <!-- You are seeing this warning because there were some Protobuf_ExpectedOutputs items
         (outside of the transient directory under obj/) not in fact produced by protoc. -->
    <Warning Condition=" '@(_Protobuf_ExpectedNotGeneratedElsewhere)' != '' and $(Protobuf_NoWarnMissingExpected) != 'true' "
             Text="Some expected protoc outputs were not generated.&#10;@(_Protobuf_ExpectedNotGeneratedElsewhere->'&#10;    %(Identity)', '')" />
  </Target>

  <!--================================================================================
                                   Proto cleanup
   =================================================================================-->

  <!-- We fully support cleanup only in a C# project. If extending the build for other
       generators/plugins, then mostly roll your own. -->

  <!-- Extension points. -->
  <Target Name="Protobuf_BeforeClean" />
  <Target Name="Protobuf_AfterClean" />

  <!-- Main cleanup sequence. -->
  <Target Name="Protobuf_Clean"
          Condition=" '@(Protobuf)' != '' "
          DependsOnTargets=" Protobuf_BeforeClean;
                             _Protobuf_SetProtoRoot;
                             Protobuf_PrepareClean;
                             _Protobuf_CoreClean;
                             Protobuf_AfterClean" />

  <!-- Do proto cleanup by default in a C# project. In other types, the user should
       invoke Protobuf_Clean directly if required. -->
  <Target Name="_Protobuf_Clean_AfterCsClean"
          AfterTargets="CoreClean"
          DependsOnTargets="Protobuf_Clean"
          Condition=" '$(Protobuf_ProjectSupported)' == 'true' and '$(Language)' == 'C#' " />

  <!-- Extension point for non-C# project. ProtoCompilerOutputs is not invoked for
       non-C# projects, since inferring protoc outputs is required, so this is a
       no-op in other project types. In your extension target populate the
       Protobuf_ExpectedOutputs with all possible output. An option is to include
       all existing outputs using Include with a wildcard, if you know where to look.

       Note this is like Protobuf_PrepareCompile, but uses @(Protobuf_Rooted) regardless
       of the Compile metadata, to remove all possible outputs. Plugins should err
       on the side of overextending the Protobuf_ExpectedOutputs here.

       All ExpectedOutputs will be removed. -->
  <Target Name="Protobuf_PrepareClean" Condition=" '@(Protobuf_Rooted)' != '' ">
    <!-- Predict expected names. -->
    <ProtoCompilerOutputs Condition=" '$(Language)' == 'C#' "
                          Protobuf="@(Protobuf_Rooted)"
                          Generator="$(Protobuf_Generator)">
      <Output TaskParameter="PossibleOutputs" ItemName="Protobuf_ExpectedOutputs" />
    </ProtoCompilerOutputs>
  </Target>

  <Target Name="_Protobuf_CoreClean">
    <ItemGroup>
      <_Protobuf_Protodep Include="$(Protobuf_DepFilesPath)*.protodep" />
    </ItemGroup>
    <Delete Files="@(Protobuf_ExpectedOutputs);@(_Protobuf_Protodep)" TreatErrorsAsWarnings="true" />
  </Target>

  <!--================================================================================
                                  Design-time support
   =================================================================================-->

  <!-- Add all .proto files to the SourceFilesProjectOutputGroupOutput, so that:
       * Visual Studio triggers a build when any of them changed;
       * The Pack target includes .proto files into the source package.  -->
  <Target Name="_Protobuf_SourceFilesProjectOutputGroup"
          BeforeTargets="SourceFilesProjectOutputGroup"
          Condition=" '@(Protobuf)' != '' " >
    <ItemGroup>
      <SourceFilesProjectOutputGroupOutput Include="@(Protobuf->'%(FullPath)')" />
    </ItemGroup>
  </Target>
</Project>
