From 7f81a6cf84eec69dfb0ae1b242c869ed2b17e2ba Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 17 Feb 2026 20:32:50 +0000
Subject: [PATCH 1/2] Initial plan


From 3bd04607b4c1829d7c194a9badb09d51d381449d Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 17 Feb 2026 21:25:37 +0000
Subject: [PATCH 2/2] Fix NativeAOT Android app crash with UnsatisfiedLinkError

Set _UseNativeLibPrefix=true so the NativeAOT SDK produces the
native binary with the "lib" prefix from the start (e.g. libMyApp.so).
Android requires native libraries to have this prefix.

Also update soname to use $(NativeBinaryPrefix) for consistency and
make _AndroidFixNativeLibraryFileName handle both cases (with and
without NativeBinaryPrefix) for backward compatibility.

Fixes #10822

Co-authored-by: jonathanpeppers <840039+jonathanpeppers@users.noreply.github.com>
---
 .../targets/Microsoft.Android.Sdk.NativeAOT.targets      | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.NativeAOT.targets b/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.NativeAOT.targets
index 8fcdee6c961..b6ab19c3b48 100644
--- a/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.NativeAOT.targets
+++ b/src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.NativeAOT.targets
@@ -25,6 +25,9 @@ This file contains the NativeAOT-specific MSBuild logic for .NET for Android.
     <!-- ResolvedFileToPublish is not populated until _AndroidComputeIlcCompileInputs, so
          proguard generation must run after that target instead of after ILLink. -->
     <_GenerateProguardAfterTargets>_AndroidComputeIlcCompileInputs</_GenerateProguardAfterTargets>
+    <!-- Android requires native libraries to have the "lib" prefix (e.g. libMyApp.so).
+         Tell the NativeAOT SDK to produce the binary with this prefix from the start. -->
+    <_UseNativeLibPrefix Condition=" '$(_UseNativeLibPrefix)' == '' ">true</_UseNativeLibPrefix>
   </PropertyGroup>
 
   <!-- Default property values for NativeAOT Debug configuration -->
@@ -100,7 +103,7 @@ This file contains the NativeAOT-specific MSBuild logic for .NET for Android.
     </PropertyGroup>
     <ItemGroup>
       <!-- Android needs a proper soname property or it will refuse to load the library -->
-      <LinkerArg Include="&quot;-Wl,-soname,lib$(TargetName)$(NativeBinaryExt)&quot;" />
+      <LinkerArg Include="&quot;-Wl,-soname,$(NativeBinaryPrefix)$(TargetName)$(NativeBinaryExt)&quot;" />
       <LinkerArg Include="-Wl,--error-unresolved-symbols" />
       <LinkerArg Include="-Wl,--no-undefined" />
 
@@ -211,8 +214,10 @@ This file contains the NativeAOT-specific MSBuild logic for .NET for Android.
 
   <Target Name="_AndroidFixNativeLibraryFileName" AfterTargets="ComputeFilesToPublish">
     <ItemGroup>
-      <!-- Fix paths to contain lib-prefix -->
+      <!-- When the runtime produces the binary without the "lib" prefix, add it -->
       <ResolvedFileToPublish Update="@(ResolvedFileToPublish)" ArchiveFileName="lib%(FileName)%(Extension)" Condition=" '%(Filename)%(Extension)' == '$(TargetName)$(NativeBinaryExt)' " />
+      <!-- When the runtime already adds the "lib" prefix via $(NativeBinaryPrefix), set ArchiveFileName explicitly -->
+      <ResolvedFileToPublish Update="@(ResolvedFileToPublish)" ArchiveFileName="%(FileName)%(Extension)" Condition=" '$(NativeBinaryPrefix)' != '' and '%(Filename)%(Extension)' == '$(NativeBinaryPrefix)$(TargetName)$(NativeBinaryExt)' " />
     </ItemGroup>
   </Target>