From a50f1ff7b73fe5d89d643d8c6d50cf1b3a1a89f1 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 16 Mar 2026 18:38:19 +0000
Subject: [PATCH 1/3] Initial plan


From 7ed1e6e07fabfe0b1dae8f9ca64b268a09ac7be4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 16 Mar 2026 18:43:52 +0000
Subject: [PATCH 2/3] Replace complex TrimmerSingleWarn intersection pattern
 with simpler Update approach

Co-authored-by: sbomer <787361+sbomer@users.noreply.github.com>
---
 .../build/Microsoft.NET.ILLink.targets           | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets b/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
index 25b31b223fe16f..b3e626b2ba3a39 100644
--- a/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
+++ b/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
@@ -227,19 +227,9 @@ Copyright (c) .NET Foundation. All rights reserved.
     <ItemGroup>
       <!-- Don't collapse to a single warning for the intermediate assembly.
            This sets metadata on the items in ResolvedFileToPublish that came from IntermediateAssembly. -->
-      <!-- Find ResolvedFileToPublish _except_ IntermediateAssembly -->
-      <__SingleWarnIntermediateAssembly Include="@(ResolvedFileToPublish)" />
-      <__SingleWarnIntermediateAssembly Remove="@(IntermediateAssembly)" />
-      <!-- Subtract these from ResolvedFileToPublish, to get the intersection. -->
-      <_SingleWarnIntermediateAssembly Include="@(ResolvedFileToPublish)" />
-      <_SingleWarnIntermediateAssembly Remove="@(__SingleWarnIntermediateAssembly)" />
-      <!-- Set metadata on the intersection. -->
-      <_SingleWarnIntermediateAssembly>
-        <TrimmerSingleWarn Condition=" '%(_SingleWarnIntermediateAssembly.TrimmerSingleWarn)' == '' ">false</TrimmerSingleWarn>
-      </_SingleWarnIntermediateAssembly>
-      <!-- Replace these items in ResolvedFileToPublish. -->
-      <ResolvedFileToPublish Remove="@(_SingleWarnIntermediateAssembly)" />
-      <ResolvedFileToPublish Include="@(_SingleWarnIntermediateAssembly)" />
+      <ResolvedFileToPublish Update="@(IntermediateAssembly)">
+        <TrimmerSingleWarn Condition=" '%(TrimmerSingleWarn)' == '' ">false</TrimmerSingleWarn>
+      </ResolvedFileToPublish>
 
       <!-- Don't collapse to a single warning for project references -->
       <ResolvedFileToPublish Condition=" '%(ResolvedFileToPublish.ProjectReferenceOriginalItemSpec)' != '' ">

From 1cb9ce214bac59caf8a0775bf96db0ad0c9c5a42 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 16 Mar 2026 20:42:16 +0000
Subject: [PATCH 3/3] Fix MSB4096: qualify TrimmerSingleWarn metadata reference
 in Update condition

Co-authored-by: sbomer <787361+sbomer@users.noreply.github.com>
---
 .../illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets b/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
index b3e626b2ba3a39..56da8c086a825d 100644
--- a/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
+++ b/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
@@ -228,7 +228,7 @@ Copyright (c) .NET Foundation. All rights reserved.
       <!-- Don't collapse to a single warning for the intermediate assembly.
            This sets metadata on the items in ResolvedFileToPublish that came from IntermediateAssembly. -->
       <ResolvedFileToPublish Update="@(IntermediateAssembly)">
-        <TrimmerSingleWarn Condition=" '%(TrimmerSingleWarn)' == '' ">false</TrimmerSingleWarn>
+        <TrimmerSingleWarn Condition=" '%(ResolvedFileToPublish.TrimmerSingleWarn)' == '' ">false</TrimmerSingleWarn>
       </ResolvedFileToPublish>
 
       <!-- Don't collapse to a single warning for project references -->