Better trimming support + trimming fix

- Allow for trimming to be set in SourceBuild.props. This enables use in repo SB legs. Includes a default set which is all netcoreapps + netstandards.
- Disable trimming for top level projects in Arcade, so that we don't accidentally skip things like publishing.

Author: mmitche

src/Microsoft.DotNet.Arcade.Sdk/tools/AfterSigning.proj

@@ -1,5 +1,8 @@
 <!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. -->
 <Project>
+  <PropertyGroup>
+    <NoTargetFrameworkFiltering>true</NoTargetFrameworkFiltering>
+  </PropertyGroup>
   <Import Project="BuildStep.props" />
 
   <Target Name="Rebuild" DependsOnTargets="Clean;Build" />

src/Microsoft.DotNet.Arcade.Sdk/tools/AfterSolutionBuild.proj

@@ -1,5 +1,10 @@
 <!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. -->
 <Project>
+  <PropertyGroup>
+    <!-- Disable target framework filtering for top level projects -->
+    <NoTargetFrameworkFiltering>true</NoTargetFrameworkFiltering>
+  </PropertyGroup>
+
   <Import Project="BuildStep.props" />
 
   <Target Name="Rebuild" DependsOnTargets="Clean;Build" />

src/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj

@@ -34,6 +34,8 @@
 
   <PropertyGroup>
     <_OriginalProjectsValue>$(Projects)</_OriginalProjectsValue>
+    <!-- Disable target framework filtering for top level projects -->
+    <NoTargetFrameworkFiltering>true</NoTargetFrameworkFiltering>
   </PropertyGroup>
 
   <ItemDefinitionGroup>

src/Microsoft.DotNet.Arcade.Sdk/tools/Publish.proj

@@ -1,5 +1,11 @@
 <!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. -->
 <Project DefaultTargets="Publish">
+
+  <PropertyGroup>
+    <!-- Disable target framework filtering for top level projects -->
+    <NoTargetFrameworkFiltering>true</NoTargetFrameworkFiltering>
+  </PropertyGroup>
+
   <!--
     Documentation for publishing is available here:
       - https://github.com/dotnet/arcade/blob/master/Documentation/CorePackages/Publishing.md

src/Microsoft.DotNet.Arcade.Sdk/tools/RepositoryValidation.proj

@@ -2,6 +2,11 @@
 <!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. -->
 <Project DefaultTargets="Validate">
 
+  <PropertyGroup>
+    <!-- Disable target framework filtering for top level projects -->
+    <NoTargetFrameworkFiltering>true</NoTargetFrameworkFiltering>
+  </PropertyGroup>
+  
   <Import Project="BuildTasks.props" />
 
   <UsingTask TaskName="Microsoft.DotNet.Arcade.Sdk.ValidateLicense" AssemblyFile="$(ArcadeSdkBuildTasksAssembly)" />

src/Microsoft.DotNet.Arcade.Sdk/tools/Sign.proj

@@ -1,5 +1,11 @@
 <!-- Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. -->
 <Project DefaultTargets="Sign">
+
+  <PropertyGroup>
+    <!-- Disable target framework filtering for top level projects -->
+    <NoTargetFrameworkFiltering>true</NoTargetFrameworkFiltering>
+  </PropertyGroup>
+
   <Import Project="BuildStep.props" />
 
   <Import Project="$(NuGetPackageRoot)microsoft.dotnet.signtool\$(MicrosoftDotNetSignToolVersion)\build\Microsoft.DotNet.SignTool.props" />

src/Microsoft.DotNet.Arcade.Sdk/tools/SourceBuild/SourceBuildArcade.targets

@@ -28,6 +28,11 @@
     <DetectSourceBuildIntermediateNupkgLicense Condition="'$(DetectSourceBuildIntermediateNupkgLicense)' == ''">true</DetectSourceBuildIntermediateNupkgLicense>
 
     <EnableDefaultSourceBuildIntermediateItems Condition="'$(EnableDefaultSourceBuildIntermediateItems)' == ''">true</EnableDefaultSourceBuildIntermediateItems>
+
+    <!-- This is fed into the inner source build as an environment variable (DotNetTargetFrameworkFilter) to enable filtering.
+         The default target framework filter includes all recent netcoreapps in SBRP, as well as 8.0 (latest) and 7.0 (working to get rid of it -->
+    <_DefaultNetFrameworkFilter>netstandard2.0%3bnetstandard2.1%3bnetcoreapp2.1%3bnet5.0%3bnet6.0%3bnet7.0%3bnet8.0</_DefaultNetFrameworkFilter>
+    <SourceBuildTargetFrameworkFilter Condition="'$(SourceBuildTrimNetFrameworkTargets)' == 'true' and '$(SourceBuildTargetFrameworkFilter)' == ''">$(_DefaultNetFrameworkFilter)</SourceBuildTargetFrameworkFilter>
   </PropertyGroup>
 
   <Target Name="GetSourceBuildIntermediateNupkgNameConvention">

src/Microsoft.DotNet.Arcade.Sdk/tools/SourceBuild/SourceBuildArcadeBuild.targets

@@ -92,6 +92,7 @@
     <ItemGroup>
       <!-- Override package cache to separate source-built packages from upstream. -->
       <InnerBuildEnv Include="NUGET_PACKAGES=$(CurrentRepoSourceBuildPackageCache)" />
+      <InnerBuildEnv Include="DotNetTargetFrameworkFilter=$(SourceBuildTargetFrameworkFilter)" />
     </ItemGroup>
   </Target>