Add flag to exclude MSBuild runtime libraries (#327)

Directory.Build.targets

@@ -13,7 +13,13 @@
     <Compile Include="$(MSBuildThisFileDirectory)/shared/**/*.cs" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'!='netstandard2.0'">
+  <PropertyGroup>
+    <ExcludeMSBuildRuntime Condition=" '$(ExcludeMSBuildRuntime)' =='' ">false</ExcludeMSBuildRuntime>
+  </PropertyGroup>
+
+  <!-- This forces the MSBuild runtime assets to be excluded from build. We have this opt-in because
+       otherwise it will add these as dependencies to all projects. -->
+  <ItemGroup Condition="$(ExcludeMSBuildRuntime)">
     <!-- Exclude MSBuild runtime assets from both src and test projects
          as they shouldn't be present in this solution's output paths.
          Instead, these dependencies should be loaded from the selected

src/cli/Microsoft.DotNet.UpgradeAssistant.Cli/Microsoft.DotNet.UpgradeAssistant.Cli.csproj

@@ -10,6 +10,7 @@
     <PackageId>upgrade-assistant</PackageId>
     <PackageIcon>icon.png</PackageIcon>
     <InstallTools>true</InstallTools>
+    <ExcludeMSBuildRuntime>true</ExcludeMSBuildRuntime>
   </PropertyGroup>
   <ItemGroup>
     <Content Include="appsettings.json">

src/components/Microsoft.DotNet.UpgradeAssistant.MSBuild/Microsoft.DotNet.UpgradeAssistant.MSBuild.csproj

@@ -5,6 +5,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Build" ExcludeAssets="runtime" />
     <PackageReference Include="NuGet.ProjectModel" ExcludeAssets="runtime" />
+    <PackageReference Include="NuGet.Frameworks" ExcludeAssets="runtime" />
     <PackageReference Include="Microsoft.Build.Locator" />
     <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" />
     <PackageReference Include="Microsoft.Extensions.Options" />
@@ -13,7 +14,6 @@
       <!-- This package is mostly COM definitions which can be loaded in .NET 5 runtime just fine -->
       <NoWarn>NU1701</NoWarn>
     </PackageReference>
-    <PackageReference Include="NuGet.Frameworks" ExcludeAssets="runtime" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\common\Microsoft.DotNet.UpgradeAssistant.Abstractions\Microsoft.DotNet.UpgradeAssistant.Abstractions.csproj" />

tests/extensions/default/analyzers/Microsoft.DotNet.UpgradeAssistant.Extensions.Default.Analyzers.Test/Microsoft.DotNet.UpgradeAssistant.Extensions.Default.Analyzers.Test.csproj

@@ -4,6 +4,7 @@
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
     <IsTestProject>true</IsTestProject>
+    <ExcludeMSBuildRuntime>true</ExcludeMSBuildRuntime>
   </PropertyGroup>
   <ItemGroup>
     <Compile Remove="assets\**" />

tests/tool/Integration.Tests/Integration.Tests.csproj

@@ -4,6 +4,7 @@
     <IsPackable>false</IsPackable>
     <IsUnitTestProject>true</IsUnitTestProject>
     <InstallTools>true</InstallTools>
+    <ExcludeMSBuildRuntime>true</ExcludeMSBuildRuntime>
   </PropertyGroup>
   <ItemGroup>
     <Compile Remove="IntegrationScenarios\**" />