Eliminate usages of pre-built packages during source-build

* Don't build MSBuild tasks for netfx during source-build
* Don't build Microsoft.Windows.Compatibility during source-build
* Don't build test projects during source-build
* Don't restore Microsoft.DiaSymReader.Native
* Don't build source generators that target older Roslyn versions
* Don't build ILStripTask since it uses a Mono.Cecil "sources" NuGet package that isn't part of source-build

Author: eerhardt

Directory.Build.props

@@ -62,6 +62,8 @@
 
     <NetFrameworkMinimum>net462</NetFrameworkMinimum>
     <NetFrameworkToolCurrent>net472</NetFrameworkToolCurrent>
+    <!-- Don't build for NETFramework during source-build. -->
+    <NetFrameworkToolCurrent Condition="'$(DotNetBuildFromSource)' == 'true'" />
   </PropertyGroup>
 
   <PropertyGroup>

eng/Subsets.props

@@ -72,7 +72,7 @@
     <DefaultHostSubsets Condition="'$(RuntimeFlavor)' != '$(PrimaryRuntimeFlavor)' and '$(TargetsMobile)' != 'true'">host.native</DefaultHostSubsets>
 
     <DefaultPacksSubsets>packs.product</DefaultPacksSubsets>
-    <DefaultPacksSubsets Condition="'$(BuildMonoAOTCrossCompilerOnly)' != 'true'">$(DefaultPacksSubsets)+packs.tests</DefaultPacksSubsets>
+    <DefaultPacksSubsets Condition="'$(BuildMonoAOTCrossCompilerOnly)' != 'true' and '$(DotNetBuildFromSource)' != 'true'">$(DefaultPacksSubsets)+packs.tests</DefaultPacksSubsets>
     <DefaultPacksSubsets Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultPacksSubsets)+packs.installers</DefaultPacksSubsets>
   </PropertyGroup>
 

src/installer/pkg/sfx/Microsoft.NETCore.App/Directory.Build.props

@@ -237,7 +237,7 @@
     <ExcludeFromClosure Include="@(NetFxReference)" />
  </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="'$(DotNetBuildFromSource)' != 'true'">
     <!-- Add a reference to Microsoft.DiaSymReader.Native if one does not already exist. -->
     <PackageReference Include="Microsoft.DiaSymReader.Native"
                       Exclude="@(PackageReference)"

src/libraries/Microsoft.Extensions.Logging.Abstractions/src/Microsoft.Extensions.Logging.Abstractions.csproj

@@ -36,7 +36,8 @@ Microsoft.Extensions.Logging.Abstractions.NullLogger</PackageDescription>
   </ItemGroup>
 
   <ItemGroup>
-    <AnalyzerReference Include="..\gen\Microsoft.Extensions.Logging.Generators.Roslyn3.11.csproj" />
+    <AnalyzerReference Include="..\gen\Microsoft.Extensions.Logging.Generators.Roslyn3.11.csproj"
+                       Condition="'$(DotNetBuildFromSource)' != 'true'" />
     <AnalyzerReference Include="..\gen\Microsoft.Extensions.Logging.Generators.Roslyn4.0.csproj" />
   </ItemGroup>
 

src/libraries/System.Text.Json/src/System.Text.Json.csproj

@@ -350,7 +350,8 @@ System.Text.Json.Utf8JsonReader</PackageDescription>
     <ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Bcl.AsyncInterfaces\src\Microsoft.Bcl.AsyncInterfaces.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <AnalyzerReference Include="..\gen\System.Text.Json.SourceGeneration.Roslyn3.11.csproj" />
+    <AnalyzerReference Include="..\gen\System.Text.Json.SourceGeneration.Roslyn3.11.csproj"
+                       Condition="'$(DotNetBuildFromSource)' != 'true'" />
     <AnalyzerReference Include="..\gen\System.Text.Json.SourceGeneration.Roslyn4.0.csproj" />
   </ItemGroup>
 </Project>

src/libraries/src.proj

@@ -14,6 +14,11 @@
                      Microsoft.Windows.Compatibility\src\Microsoft.Windows.Compatibility.csproj"
              Condition="'$(BuildAllConfigurations)' != 'true'" />
 
+    <!-- These projects do not need to be built during source-build. -->
+    <_allSrc Remove="Microsoft.Extensions.DependencyInjection.Specification.Tests\src\Microsoft.Extensions.DependencyInjection.Specification.Tests.csproj;
+                     Microsoft.Windows.Compatibility\src\Microsoft.Windows.Compatibility.csproj"
+             Condition="'$(DotNetBuildFromSource)' == 'true'" />
+
     <NonNetCoreAppProject Include="@(_allSrc)"
                           Exclude="@(NetCoreAppLibrary->'%(Identity)\src\%(Identity).csproj');
                                    $(MSBuildThisFileDirectory)Microsoft.VisualBasic.Core\src\Microsoft.VisualBasic.Core.vbproj;

src/tasks/Directory.Build.props

@@ -3,6 +3,9 @@
 
   <PropertyGroup>
     <TargetFrameworkForNETFrameworkTasks>net472</TargetFrameworkForNETFrameworkTasks>
+    <!-- Don't build for NETFramework during source-build. -->
+    <TargetFrameworkForNETFrameworkTasks Condition="'$(DotNetBuildFromSource)' == 'true'" />
+
     <TargetFrameworkForNETCoreTasks>net6.0</TargetFrameworkForNETCoreTasks>
   </PropertyGroup>
 </Project>

src/tasks/tasks.proj

@@ -1,6 +1,11 @@
 <Project Sdk="Microsoft.Build.Traversal">
   <ItemGroup>
     <ProjectReference Include="$(MSBuildThisFileDirectory)**\*.csproj" />
+
+    <!-- These projects do not need to be built during source-build. -->
+    <!-- For example, they may take dependencies on pre-built packages that aren't build-from-source. e.g. 'Microsoft.DotNet.CilStrip.Sources' -->
+    <ProjectReference Remove="MonoTargetsTasks\MonoTargetsTasks.csproj"
+                      Condition="'$(DotNetBuildFromSource)' == 'true'" />
   </ItemGroup>
 
   <!--