Robust.Trimming.targets

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="12.0">
  <!--
  Stuff for using ILLink trimming without self-contained deployments.
  This is not something officially supported by the .NET SDK currently, but we can simply run ILLink ourselves.
  -->

  <!--
  A lot of stuff taken from Microsoft.NET.ILLink.targets in the SDK files.
  -->

  <ItemDefinitionGroup>
    <RobustLinkRoots>
      <Visible>false</Visible>
    </RobustLinkRoots>
    <RobustLinkAssemblies>
      <Visible>false</Visible>
    </RobustLinkAssemblies>
  </ItemDefinitionGroup>

  <Target Name="RobustILLink"
          BeforeTargets="ILLink"
          Condition="'$(PublishTrimmed)' != 'true' And
                       '$(RobustILLink)' == 'true'"
          DependsOnTargets="_ComputeAssembliesToPostprocessOnPublish">

    <ComputeManagedAssemblies Assemblies="@(ResolvedFileToPublish)">
      <Output TaskParameter="ManagedAssemblies" ItemName="_ResolvedFileToPublishFiltered" />
    </ComputeManagedAssemblies>

    <JoinItems Left="@(_ResolvedFileToPublishFiltered)" LeftKey="FileName" LeftMetadata="*"
               Right="@(RobustLinkRoots)"
               ItemSpecToUse="Left">
      <Output TaskParameter="JoinResult" ItemName="_RobustLinkRootsJoined" />
    </JoinItems>

    <JoinItems Left="@(_ResolvedFileToPublishFiltered)" LeftKey="FileName" LeftMetadata="*"
               Right="@(RobustLinkAssemblies)"
               ItemSpecToUse="Left">
      <Output TaskParameter="JoinResult" ItemName="_RobustLinkAssembliesJoined" />
    </JoinItems>

    <PropertyGroup>
      <TrimMode Condition=" '$(TrimMode)' == '' ">link</TrimMode>
      <TrimmerDefaultAction Condition=" '$(TrimmerDefaultAction)' == '' ">copy</TrimmerDefaultAction>
      <_ExtraTrimmerArgs>--skip-unresolved true $(_ExtraTrimmerArgs)</_ExtraTrimmerArgs>
      <ILLinkTreatWarningsAsErrors Condition=" '$(ILLinkTreatWarningsAsErrors)' == '' ">$(TreatWarningsAsErrors)</ILLinkTreatWarningsAsErrors>
      <TrimmerSingleWarn Condition=" '$(TrimmerSingleWarn)' == '' ">true</TrimmerSingleWarn>
    </PropertyGroup>

    <ItemGroup>
      <RobustAssemblyToLink Include="@(_RobustLinkRootsJoined)">
        <TrimMode>Copy</TrimMode>
      </RobustAssemblyToLink>
      <RobustAssemblyToLink Include="@(_RobustLinkAssembliesJoined)">
        <TrimMode>Link</TrimMode>
      </RobustAssemblyToLink>
    </ItemGroup>

    <ItemGroup>
      <!-- The linker implicitly picks up PDBs next to input assemblies. We will filter these out of the publish set. -->
      <__PDBToLink Include="@(ResolvedFileToPublish)" Exclude="@(RobustAssemblyToLink->'%(RelativeDir)%(Filename).pdb')" />
      <_PDBToLink Include="@(ResolvedFileToPublish)" Exclude="@(__PDBToLink)" />
    </ItemGroup>

    <ItemGroup>
      <_LinkedResolvedFileToPublishCandidate Include="@(RobustAssemblyToLink->'$(IntermediateLinkDir)%(Filename)%(Extension)')" />
      <_LinkedResolvedFileToPublishCandidate Include="@(_PDBToLink->'$(IntermediateLinkDir)%(Filename)%(Extension)')" />
    </ItemGroup>

    <!--<Message Text="@(ResolvedFileToPublish)" Importance="high" />-->

    <ItemGroup>
      <_TrimmerFeatureSettings Include="@(RuntimeHostConfigurationOption)"
                               Condition="'%(RuntimeHostConfigurationOption.Trim)' == 'true'" />
    </ItemGroup>

    <Delete Files="@(_LinkedResolvedFileToPublishCandidate)" />
    <ILLink AssemblyPaths="@(RobustAssemblyToLink)"
            ReferenceAssemblyPaths="@(ReferencePath)"
            RootAssemblyNames="@(RobustLinkRoots)"
            TrimMode="Skip"
            DefaultAction="$(TrimmerDefaultAction)"
            RemoveSymbols="false"
            FeatureSettings="@(_TrimmerFeatureSettings)"
            CustomData="@(_TrimmerCustomData)"

            BeforeFieldInit="$(_TrimmerBeforeFieldInit)"
            OverrideRemoval="$(_TrimmerOverrideRemoval)"
            UnreachableBodies="$(_TrimmerUnreachableBodies)"
            UnusedInterfaces="$(_TrimmerUnusedInterfaces)"
            IPConstProp="$(_TrimmerIPConstProp)"
            Sealer="$(_TrimmerSealer)"

            Warn="$(ILLinkWarningLevel)"
            NoWarn="$(NoWarn)"
            TreatWarningsAsErrors="$(ILLinkTreatWarningsAsErrors)"
            WarningsAsErrors="$(WarningsAsErrors)"
            WarningsNotAsErrors="$(WarningsNotAsErrors)"
            SingleWarn="$(TrimmerSingleWarn)"

            CustomSteps="@(_TrimmerCustomSteps)"
            RootDescriptorFiles="@(TrimmerRootDescriptor)"
            OutputDirectory="$(IntermediateLinkDir)"
            DumpDependencies="$(_TrimmerDumpDependencies)"
            ExtraArgs="$(_ExtraTrimmerArgs)"
            ToolExe="$(_DotNetHostFileName)"
            ToolPath="$(_DotNetHostDirectory)"
            ContinueOnError="ErrorAndContinue">
      <Output TaskParameter="ExitCode" PropertyName="_ILLinkExitCode" />
    </ILLink>

    <Touch Files="$(_LinkSemaphore)" AlwaysCreate="true" Condition=" '$(_ILLinkExitCode)' == '0' " />

    <ItemGroup>
      <_LinkedResolvedFileToPublish Include="@(_LinkedResolvedFileToPublishCandidate)" Condition="Exists('%(Identity)')" />
      <ResolvedFileToPublish Remove="@(RobustAssemblyToLink)" />
      <ResolvedFileToPublish Remove="@(_PDBToLink)" />
      <ResolvedFileToPublish Include="@(_LinkedResolvedFileToPublish)" />
    </ItemGroup>
  </Target>

</Project>