From aa1e8c880af0396a56328997b20d1ed81bdfb15a Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 22 Sep 2025 06:47:15 +0000
Subject: [PATCH 1/2] Initial plan


From 31297b1e341cefb9de5a1db81bef5cc8c06d479d Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 22 Sep 2025 06:56:10 +0000
Subject: [PATCH 2/2] Add MSBuild fix to prevent RuntimeIdentifier from being
 passed to class libraries during publish

Co-authored-by: haonanttt <186026394+haonanttt@users.noreply.github.com>
---
 ...Microsoft.WindowsAppSDK.Foundation.targets |  3 +++
 ...Microsoft.WindowsAppSDK.PublishFix.targets | 25 +++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 build/NuSpecs/Microsoft.WindowsAppSDK.PublishFix.targets

diff --git a/build/NuSpecs/Microsoft.WindowsAppSDK.Foundation.targets b/build/NuSpecs/Microsoft.WindowsAppSDK.Foundation.targets
index 925af86b..7c444a72 100644
--- a/build/NuSpecs/Microsoft.WindowsAppSDK.Foundation.targets
+++ b/build/NuSpecs/Microsoft.WindowsAppSDK.Foundation.targets
@@ -15,6 +15,9 @@
 
   <Import Project="$(MSBuildThisFileDirectory)Microsoft.WindowsAppSDK.AutoInitializerCommon.targets" />
   <Import Project="$(MSBuildThisFileDirectory)Microsoft.WindowsAppSDK.AutoInitializer.CS.targets" Condition="'$(WindowsAppSdkAutoInitialize)' == 'true'"/>
+
+  <!-- Fix for RuntimeIdentifier issue during publish of class libraries -->
+  <Import Project="$(MSBuildThisFileDirectory)Microsoft.WindowsAppSDK.PublishFix.targets" />
   
   <ItemGroup>
     <Compile Condition="'$(WindowsAppSDKAggregatePackage)' == 'true' and '$(WindowsAppSdkIncludeVersionInfo)'=='true'" Include="$(MSBuildThisFileDirectory)..\include\WindowsAppSDK-VersionInfo.cs" />
diff --git a/build/NuSpecs/Microsoft.WindowsAppSDK.PublishFix.targets b/build/NuSpecs/Microsoft.WindowsAppSDK.PublishFix.targets
new file mode 100644
index 00000000..8dc4421f
--- /dev/null
+++ b/build/NuSpecs/Microsoft.WindowsAppSDK.PublishFix.targets
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT License. See LICENSE in the project root for license information. -->
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+
+  <!--
+    Fix for issue where RuntimeIdentifier should not be used when determining outputs of referenced class libraries during publish.
+    
+    The problem occurs when publishing a WinUI app with a RuntimeIdentifier specified - the RID gets incorrectly passed
+    to class library projects when MSBuild is determining their outputs. Class libraries should not consider the RID
+    since they are platform-agnostic.
+    
+    This fix uses MSBuild's built-in ProjectReferenceGlobalPropertiesToRemove mechanism to prevent RuntimeIdentifier
+    from being passed to referenced projects during publish operations only.
+  -->
+  
+  <PropertyGroup Condition="'$(RuntimeIdentifier)' != '' and ('$(IsPublishing)' == 'true' or '$(DeployOnBuild)' == 'true' or '$(PublishProfile)' != '')">
+    <!-- 
+      During publish operations, ensure RuntimeIdentifier is not passed to referenced class library projects.
+      This prevents the RID from affecting class library output path resolution during publish.
+    -->
+    <ProjectReferenceGlobalPropertiesToRemove Condition="'$(ProjectReferenceGlobalPropertiesToRemove)' == ''">RuntimeIdentifier</ProjectReferenceGlobalPropertiesToRemove>
+    <ProjectReferenceGlobalPropertiesToRemove Condition="'$(ProjectReferenceGlobalPropertiesToRemove)' != '' and !$(ProjectReferenceGlobalPropertiesToRemove.Contains('RuntimeIdentifier'))">$(ProjectReferenceGlobalPropertiesToRemove);RuntimeIdentifier</ProjectReferenceGlobalPropertiesToRemove>
+  </PropertyGroup>
+
+</Project>
\ No newline at end of file