Merge remote-tracking branch 'upstream/main' into HEAD

1 files changed, 36 insertions, 0 deletions

diff --git a/Directory.Build.targets b/Directory.Build.targets
index c46b686c543..3aa6ad169b1 100644
--- a/Directory.Build.targets
+++ b/Directory.Build.targets
@@ -55,6 +55,7 @@
     <PackageDescription Condition="'$(PackageDescription)' == '' and '$(UseRuntimePackageDisclaimer)' == 'true'">$(RuntimePackageDisclaimer)</PackageDescription>
     <!-- Keep in sync as required by the Packaging SDK in Arcade. -->
     <Description>$(PackageDescription)</Description>
+    <BeforePack>$(BeforePack);AddNETStandardCompatErrorFileForPackaging</BeforePack>
   </PropertyGroup>
 
   <!-- Remove when https://github.com/NuGet/Home/issues/10405 is implemented and consumed. -->
@@ -71,4 +72,39 @@
       <PackDependsOn />
     </PropertyGroup>
   </Target>
+
+  <!-- Add targets file that marks a .NETStandard applicable tfm as unsupported. -->
+  <Target Name="AddNETStandardCompatErrorFileForPackaging"
+          Condition="'@(NETStandardCompatError)' != ''"
+          Inputs="%(NETStandardCompatError.Identity)"
+          Outputs="unused"
+          BeforeTargets="GetFiles">
+    <PropertyGroup>
+      <_NETStandardCompatErrorFilePath>$(BaseIntermediateOutputPath)netstandardcompaterrors\%(NETStandardCompatError.Identity)\$(PackageId).targets</_NETStandardCompatErrorFilePath>
+      <_NETStandardCompatErrorFileTarget>NETStandardCompatError_$(PackageId.Replace('.', '_'))_$([System.String]::new('%(NETStandardCompatError.Supported)').Replace('.', '_'))</_NETStandardCompatErrorFileTarget>
+      <_NETStandardCompatErrorFileContent>
+<![CDATA[<Project InitialTargets="$(_NETStandardCompatErrorFileTarget)">
+  <Target Name="$(_NETStandardCompatErrorFileTarget)"
+          Condition="'%24(SuppressTfmSupportBuildWarnings)' == ''">
+    <Error Text="$(PackageId) doesn't support %24(TargetFramework). Consider updating your TargetFramework to %(NETStandardCompatError.Supported) or later." />
+  </Target>
+</Project>]]>
+      </_NETStandardCompatErrorFileContent>
+    </PropertyGroup>
+
+    <WriteLinesToFile File="$(_NETStandardCompatErrorFilePath)"
+                      Lines="$(_NETStandardCompatErrorFileContent)"
+                      Overwrite="true"
+                      WriteOnlyWhenDifferent="true" />
+
+    <ItemGroup>
+      <None Include="$(_NETStandardCompatErrorFilePath)"
+            PackagePath="buildTransitive\%(NETStandardCompatError.Identity)"
+            Pack="true" />
+      <None Include="$(PlaceholderFile)"
+            PackagePath="buildTransitive\%(NETStandardCompatError.Supported)"
+            Pack="true" />
+      <FileWrites Include="$(_NETStandardCompatErrorFilePath)" />
+    </ItemGroup>
+  </Target>
 </Project>