From 293d47286161827ecc0d6e96f9eb7b82dafe8307 Mon Sep 17 00:00:00 2001
From: Viktor Hofer <viktor.hofer@microsoft.com>
Date: Wed, 26 May 2021 12:09:00 +0200
Subject: Generate targets files that throws for unsupported netstandard
 applicable tfms (#53244)

* Generate targets files that throw for unsupported NS tfm

For S.D.Common, S.Speech and S.Sec.Crypto.Pkcs we manually added a
targets file to mark the .NETStandard asset as not applicable.
This was done to allow defining a minimum supported .NETCoreApp
version, even though a compatible .NETStandard asset is available.
This commit automatically generates that targets file based on
items.
---
 Directory.Build.targets | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'Directory.Build.targets')

diff --git a/Directory.Build.targets b/Directory.Build.targets
index e6457e6111c..0460647e6de 100644
--- a/Directory.Build.targets
+++ b/Directory.Build.targets
@@ -54,6 +54,7 @@
     <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. -->
@@ -70,4 +71,39 @@
       <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>
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