Add CompilerLoweringPreserveAttribute (#117729)

sbomer · web-flow · commit 757fb9de52ba · 2025-07-18T11:29:14.000-07:00
* Add CompilerLoweringPreserveAttribute

And apply it to DynamicallyAccessedMembersAttribute.
This ensures that DAM flows to compiler-generated code.
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/ref/Microsoft.Extensions.Configuration.Binder.csproj b/src/libraries/Microsoft.Extensions.Configuration.Binder/ref/Microsoft.Extensions.Configuration.Binder.csproj
@@ -13,6 +13,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/src/Microsoft.Extensions.Configuration.Binder.csproj b/src/libraries/Microsoft.Extensions.Configuration.Binder/src/Microsoft.Extensions.Configuration.Binder.csproj
@@ -29,6 +29,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.DependencyInjection.Abstractions/ref/Microsoft.Extensions.DependencyInjection.Abstractions.csproj b/src/libraries/Microsoft.Extensions.DependencyInjection.Abstractions/ref/Microsoft.Extensions.DependencyInjection.Abstractions.csproj
@@ -12,6 +12,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'netstandard2.1'))">
diff --git a/src/libraries/Microsoft.Extensions.DependencyInjection.Abstractions/src/Microsoft.Extensions.DependencyInjection.Abstractions.csproj b/src/libraries/Microsoft.Extensions.DependencyInjection.Abstractions/src/Microsoft.Extensions.DependencyInjection.Abstractions.csproj
@@ -28,6 +28,7 @@ Microsoft.Extensions.DependencyInjection.IServiceCollection</PackageDescription>
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'netstandard2.1'))">
diff --git a/src/libraries/Microsoft.Extensions.DependencyInjection/src/Microsoft.Extensions.DependencyInjection.csproj b/src/libraries/Microsoft.Extensions.DependencyInjection/src/Microsoft.Extensions.DependencyInjection.csproj
@@ -41,6 +41,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp' or $([MSBuild]::VersionLessThan('$(TargetFrameworkVersion)', '9.0'))">
diff --git a/src/libraries/Microsoft.Extensions.DependencyInjection/tests/DI.Tests/Microsoft.Extensions.DependencyInjection.Tests.csproj b/src/libraries/Microsoft.Extensions.DependencyInjection/tests/DI.Tests/Microsoft.Extensions.DependencyInjection.Tests.csproj
@@ -18,6 +18,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/ref/Microsoft.Extensions.Diagnostics.Abstractions.csproj b/src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/ref/Microsoft.Extensions.Diagnostics.Abstractions.csproj
@@ -11,6 +11,7 @@
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/src/Microsoft.Extensions.Diagnostics.Abstractions.csproj b/src/libraries/Microsoft.Extensions.Diagnostics.Abstractions/src/Microsoft.Extensions.Diagnostics.Abstractions.csproj
@@ -26,6 +26,7 @@ Microsoft.Extensions.Diagnostics.Metrics.MetricsOptions</PackageDescription>
     <PackageReference Include="System.Memory" Version="$(SystemMemoryVersion)" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' != '$(NetCoreAppCurrent)'">
diff --git a/src/libraries/Microsoft.Extensions.Hosting.Abstractions/ref/Microsoft.Extensions.Hosting.Abstractions.csproj b/src/libraries/Microsoft.Extensions.Hosting.Abstractions/ref/Microsoft.Extensions.Hosting.Abstractions.csproj
@@ -12,6 +12,7 @@
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
   
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Hosting.Abstractions/src/Microsoft.Extensions.Hosting.Abstractions.csproj b/src/libraries/Microsoft.Extensions.Hosting.Abstractions/src/Microsoft.Extensions.Hosting.Abstractions.csproj
@@ -15,6 +15,7 @@
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Hosting/ref/Microsoft.Extensions.Hosting.csproj b/src/libraries/Microsoft.Extensions.Hosting/ref/Microsoft.Extensions.Hosting.csproj
@@ -11,6 +11,7 @@
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Hosting/src/Microsoft.Extensions.Hosting.csproj b/src/libraries/Microsoft.Extensions.Hosting/src/Microsoft.Extensions.Hosting.csproj
@@ -18,6 +18,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Http/ref/Microsoft.Extensions.Http.csproj b/src/libraries/Microsoft.Extensions.Http/ref/Microsoft.Extensions.Http.csproj
@@ -10,6 +10,7 @@
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Http/src/Microsoft.Extensions.Http.csproj b/src/libraries/Microsoft.Extensions.Http/src/Microsoft.Extensions.Http.csproj
@@ -23,6 +23,7 @@ System.Net.Http.IHttpClientFactory</PackageDescription>
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Logging.Configuration/ref/Microsoft.Extensions.Logging.Configuration.csproj b/src/libraries/Microsoft.Extensions.Logging.Configuration/ref/Microsoft.Extensions.Logging.Configuration.csproj
@@ -13,6 +13,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Logging.Configuration/src/Microsoft.Extensions.Logging.Configuration.csproj b/src/libraries/Microsoft.Extensions.Logging.Configuration/src/Microsoft.Extensions.Logging.Configuration.csproj
@@ -21,6 +21,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Logging.Console/ref/Microsoft.Extensions.Logging.Console.csproj b/src/libraries/Microsoft.Extensions.Logging.Console/ref/Microsoft.Extensions.Logging.Console.csproj
@@ -15,6 +15,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\StringSyntaxAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Logging.Console/src/Microsoft.Extensions.Logging.Console.csproj b/src/libraries/Microsoft.Extensions.Logging.Console/src/Microsoft.Extensions.Logging.Console.csproj
@@ -37,6 +37,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\StringSyntaxAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Options.ConfigurationExtensions/ref/Microsoft.Extensions.Options.ConfigurationExtensions.csproj b/src/libraries/Microsoft.Extensions.Options.ConfigurationExtensions/ref/Microsoft.Extensions.Options.ConfigurationExtensions.csproj
@@ -13,6 +13,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Options.ConfigurationExtensions/src/Microsoft.Extensions.Options.ConfigurationExtensions.csproj b/src/libraries/Microsoft.Extensions.Options.ConfigurationExtensions/src/Microsoft.Extensions.Options.ConfigurationExtensions.csproj
@@ -13,6 +13,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Options.DataAnnotations/ref/Microsoft.Extensions.Options.DataAnnotations.csproj b/src/libraries/Microsoft.Extensions.Options.DataAnnotations/ref/Microsoft.Extensions.Options.DataAnnotations.csproj
@@ -11,6 +11,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Options.DataAnnotations/src/Microsoft.Extensions.Options.DataAnnotations.csproj b/src/libraries/Microsoft.Extensions.Options.DataAnnotations/src/Microsoft.Extensions.Options.DataAnnotations.csproj
@@ -13,6 +13,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Options/ref/Microsoft.Extensions.Options.csproj b/src/libraries/Microsoft.Extensions.Options/ref/Microsoft.Extensions.Options.csproj
@@ -10,6 +10,7 @@
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.Options/src/Microsoft.Extensions.Options.csproj b/src/libraries/Microsoft.Extensions.Options/src/Microsoft.Extensions.Options.csproj
@@ -11,6 +11,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSource.csproj
@@ -15,6 +15,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs"  />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\IsExternalInit.cs" />
   </ItemGroup>
 
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
@@ -129,6 +129,7 @@ System.Diagnostics.DiagnosticSource</PackageDescription>
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\IsExternalInit.cs" />
   </ItemGroup>
 
diff --git a/src/libraries/System.Diagnostics.EventLog/src/System.Diagnostics.EventLog.csproj b/src/libraries/System.Diagnostics.EventLog/src/System.Diagnostics.EventLog.csproj
@@ -126,6 +126,7 @@ System.Diagnostics.EventLog</PackageDescription>
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMembersAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
diff --git a/src/libraries/System.Net.Http.Json/ref/System.Net.Http.Json.csproj b/src/libraries/System.Net.Http.Json/ref/System.Net.Http.Json.csproj
@@ -15,6 +15,7 @@
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\StringSyntaxAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/libraries/System.Net.Http.Json/src/System.Net.Http.Json.csproj b/src/libraries/System.Net.Http.Json/src/System.Net.Http.Json.csproj
@@ -39,6 +39,7 @@ System.Net.Http.Json.JsonContent</PackageDescription>
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresUnreferencedCodeAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\StringSyntaxAttribute.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\UnconditionalSuppressMessageAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
     <Compile Include="System\ArraySegmentExtensions.netstandard.cs" />
     <Compile Include="System\Net\Http\Json\HttpClientJsonExtensions.netstandard.cs" />
     <Compile Include="System\Net\Http\Json\HttpContentJsonExtensions.netstandard.cs" />
diff --git a/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems b/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems
@@ -834,6 +834,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\CompilationRelaxationsAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\CompilerFeatureRequiredAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\CompilerGeneratedAttribute.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\CompilerGlobalScopeAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\ConditionalWeakTable.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\ConfiguredAsyncDisposable.cs" />
diff --git a/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/DynamicallyAccessedMembersAttribute.cs b/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/DynamicallyAccessedMembersAttribute.cs
@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Runtime.CompilerServices;
+
 namespace System.Diagnostics.CodeAnalysis
 {
     /// <summary>
@@ -25,6 +27,7 @@ namespace System.Diagnostics.CodeAnalysis
     /// should only be used on instance methods of types assignable to System.Type (or string, but no methods
     /// will use it there).
     /// </remarks>
+    [CompilerLoweringPreserve]
     [AttributeUsage(
         AttributeTargets.Field | AttributeTargets.ReturnValue | AttributeTargets.GenericParameter |
         AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.Method |
diff --git a/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/CompilerLoweringPreserveAttribute.cs b/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/CompilerLoweringPreserveAttribute.cs
@@ -0,0 +1,16 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace System.Runtime.CompilerServices
+{
+    [AttributeUsage(AttributeTargets.Class, Inherited = false)]
+#if SYSTEM_PRIVATE_CORELIB
+    public
+#else
+    internal
+#endif
+    sealed class CompilerLoweringPreserveAttribute : Attribute
+    {
+        public CompilerLoweringPreserveAttribute() { }
+    }
+}
diff --git a/src/libraries/System.Resources.Extensions/src/System.Resources.Extensions.csproj b/src/libraries/System.Resources.Extensions/src/System.Resources.Extensions.csproj
@@ -81,6 +81,8 @@ System.Resources.Extensions.PreserializedResourceWriter</PackageDescription>
              Link="System\Diagnostics\CodeAnalysis\DynamicallyAccessedMemberTypes.cs" />
     <Compile Include="$(CoreLibSharedDir)System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs"
              Link="System\Diagnostics\CodeAnalysis\RequiresDynamicCodeAttribute.cs" />
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs"
+             Link="System\Runtime\CompilerServices\CompilerLoweringPreserveAttribute.cs" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
diff --git a/src/libraries/System.Runtime/ref/System.Runtime.cs b/src/libraries/System.Runtime/ref/System.Runtime.cs
@@ -8889,7 +8889,8 @@ public sealed partial class DoesNotReturnIfAttribute : System.Attribute
         public DoesNotReturnIfAttribute(bool parameterValue) { }
         public bool ParameterValue { get { throw null; } }
     }
-    [System.AttributeUsageAttribute(System.AttributeTargets.Class | System.AttributeTargets.Field | System.AttributeTargets.GenericParameter | System.AttributeTargets.Interface | System.AttributeTargets.Method | System.AttributeTargets.Parameter | System.AttributeTargets.Property | System.AttributeTargets.ReturnValue | System.AttributeTargets.Struct, Inherited=false)]
+    [System.Runtime.CompilerServices.CompilerLoweringPreserveAttribute]
+    [System.AttributeUsageAttribute(System.AttributeTargets.Class | System.AttributeTargets.Field | System.AttributeTargets.GenericParameter | System.AttributeTargets.Interface | System.AttributeTargets.Method | System.AttributeTargets.Parameter | System.AttributeTargets.Property | System.AttributeTargets.ReturnValue | System.AttributeTargets.Struct, Inherited = false)]
     public sealed partial class DynamicallyAccessedMembersAttribute : System.Attribute
     {
         public DynamicallyAccessedMembersAttribute(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes memberTypes) { }
@@ -13270,6 +13271,11 @@ public enum CompilationRelaxations
     {
         NoStringInterning = 8,
     }
+    [System.AttributeUsageAttribute(System.AttributeTargets.Class, Inherited = false)]
+    public sealed class CompilerLoweringPreserveAttribute : System.Attribute
+    {
+        public CompilerLoweringPreserveAttribute() { }
+    }
     [System.AttributeUsageAttribute(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Method | System.AttributeTargets.Module)]
     public partial class CompilationRelaxationsAttribute : System.Attribute
     {
diff --git a/src/libraries/System.Text.Json/ref/System.Text.Json.csproj b/src/libraries/System.Text.Json/ref/System.Text.Json.csproj
diff --git a/src/libraries/System.Text.Json/src/System.Text.Json.csproj b/src/libraries/System.Text.Json/src/System.Text.Json.csproj
