From c3fdc1d699b2d6475d18affdd7f2e44c7aea4a68 Mon Sep 17 00:00:00 2001
From: Vatsan Madhavan <vatsan.madhavan@microsoft.com>
Date: Sat, 13 Apr 2019 00:47:33 -0700
Subject: [PATCH 1/2] Add [assembly:AssemblyMetadata(Language, C++)] attribute
 to aid CrossGen

---
 .../tools/ExtendedAssemblyInfo.targets         | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/eng/WpfArcadeSdk/tools/ExtendedAssemblyInfo.targets b/eng/WpfArcadeSdk/tools/ExtendedAssemblyInfo.targets
index 691438dfd8a..d834dbe8852 100644
--- a/eng/WpfArcadeSdk/tools/ExtendedAssemblyInfo.targets
+++ b/eng/WpfArcadeSdk/tools/ExtendedAssemblyInfo.targets
@@ -40,6 +40,24 @@
       <AssemblyMetadata Include="Commit" Condition="'$(SourceRevisionId)'!=''">
         <Value>$(SourceRevisionId)</Value>
       </AssemblyMetadata>
+
+      <!-- 
+        Crossgen wants to detect when an assembly is built from C++/CLI sources, 
+        since it is unable to function correctly today (ostensibly due to bugs). Since
+        /clr:pure is deprecated and WPF will eventually switch over to /clr (i.e., IJW),
+        Crossgen will eventually (i.e., in the near-term) fail to work on C++/CLI 
+        assemblies anyway. 
+
+        Crossgen will detect [assembly: AssemblyMetadta("Language", "C++")] and
+        skip those assemblies. WPF will add this attribute to assemblies that are
+        compiled from C++/CLI sources. 
+
+        WPF will also add [assembly: AssemblyMetadata("Language, "C#")] to C#
+        assemblies.
+      --> 
+      <AssemblyMetadata Include="Language" Condition="'$(Language)'!=''">
+        <Value>$(Language)</Value>
+      </AssemblyMetadata>
     </ItemGroup>
   </Target>
   

From 3d19bceb7a351fdb7cd976d5857582bafc279bee Mon Sep 17 00:00:00 2001
From: Vatsan Madhavan <vatsan.madhavan@microsoft.com>
Date: Tue, 16 Apr 2019 10:24:55 -0700
Subject: [PATCH 2/2] Add link to GitHub issue

---
 eng/WpfArcadeSdk/tools/ExtendedAssemblyInfo.targets | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/eng/WpfArcadeSdk/tools/ExtendedAssemblyInfo.targets b/eng/WpfArcadeSdk/tools/ExtendedAssemblyInfo.targets
index d834dbe8852..466425168a2 100644
--- a/eng/WpfArcadeSdk/tools/ExtendedAssemblyInfo.targets
+++ b/eng/WpfArcadeSdk/tools/ExtendedAssemblyInfo.targets
@@ -54,6 +54,8 @@
 
         WPF will also add [assembly: AssemblyMetadata("Language, "C#")] to C#
         assemblies.
+        
+        https://github.com/dotnet/wpf/issues/587
       --> 
       <AssemblyMetadata Include="Language" Condition="'$(Language)'!=''">
         <Value>$(Language)</Value>