dotnet · sbomer · Jul 31, 2025 · Jul 29, 2025 · Jul 29, 2025
diff --git a/src/libraries/Directory.Build.props b/src/libraries/Directory.Build.props
@@ -48,8 +48,8 @@
     <!-- Nullability is enabled by default except for test projects, which instead default to annotations. -->
     <Nullable Condition="'$(Nullable)' == '' and '$(IsTestProject)' != 'true'">enable</Nullable>
     <Nullable Condition="'$(Nullable)' == '' and '$(IsTestProject)' == 'true'">annotations</Nullable>
-    <!-- AOT compatibility is enabled by default for src projects. -->
-    <IsAotCompatible Condition="'$(IsAotCompatible)' == '' and '$(IsSourceProject)' == 'true'">true</IsAotCompatible>
+    <!-- AOT compatibility is enabled by default for src/ref projects. -->
+    <IsAotCompatible Condition="'$(IsAotCompatible)' == '' and ('$(IsSourceProject)' == 'true' or '$(IsReferenceAssemblyProject)' == 'true')">true</IsAotCompatible>
   </PropertyGroup>
 
   <!-- Set up common paths -->

diff --git a/src/libraries/System.ComponentModel.Composition/Directory.Build.props b/src/libraries/System.ComponentModel.Composition/Directory.Build.props
@@ -3,5 +3,6 @@
   <PropertyGroup>
     <StrongNameKeyId>ECMA</StrongNameKeyId>
     <IsTrimmable>false</IsTrimmable>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/src/libraries/System.ComponentModel.Composition/src/System.ComponentModel.Composition.csproj b/src/libraries/System.ComponentModel.Composition/src/System.ComponentModel.Composition.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0</TargetFrameworks>
-    <IsAotCompatible>false</IsAotCompatible>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>
     <AddNETFrameworkPlaceholderFileToPackage>true</AddNETFrameworkPlaceholderFileToPackage>

diff --git a/src/libraries/System.Configuration.ConfigurationManager/Directory.Build.props b/src/libraries/System.Configuration.ConfigurationManager/Directory.Build.props
@@ -5,5 +5,6 @@
     <UnsupportedOSPlatforms>browser;wasi</UnsupportedOSPlatforms>
     <!-- opt-out of trimming until it works https://github.com/dotnet/runtime/issues/49062 -->
     <IsTrimmable>false</IsTrimmable>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/...m.Configuration.ConfigurationManager/src/System.Configuration.ConfigurationManager.csproj b/...m.Configuration.ConfigurationManager/src/System.Configuration.ConfigurationManager.csproj
@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
     <NoWarn>$(NoWarn);CA2249</NoWarn>
-    <IsAotCompatible>false</IsAotCompatible>
     <IncludeInternalObsoleteAttribute>true</IncludeInternalObsoleteAttribute>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>

diff --git a/src/libraries/System.Data.Odbc/Directory.Build.props b/src/libraries/System.Data.Odbc/Directory.Build.props
@@ -3,5 +3,6 @@
   <PropertyGroup>
     <IncludePlatformAttributes>true</IncludePlatformAttributes>
     <UnsupportedOSPlatforms>browser;wasi</UnsupportedOSPlatforms>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/src/libraries/System.Data.Odbc/src/System.Data.Odbc.csproj b/src/libraries/System.Data.Odbc/src/System.Data.Odbc.csproj
@@ -5,7 +5,6 @@
     <TargetFrameworks Condition="'$(NetCoreAppPrevious)' != ''">$(TargetFrameworks);$(NetCoreAppPrevious)-windows;$(NetCoreAppPrevious)-unix;$(NetCoreAppPrevious)</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <NoWarn>$(NoWarn);CA2249;CA1838</NoWarn>
-    <IsAotCompatible>false</IsAotCompatible>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>
     <PackageDescription>Provides a collection of classes used to access an ODBC data source in the managed space

diff --git a/src/libraries/System.Data.OleDb/Directory.Build.props b/src/libraries/System.Data.OleDb/Directory.Build.props
@@ -2,5 +2,6 @@
   <Import Project="..\Directory.Build.props" />
   <PropertyGroup>
     <SupportedOSPlatforms>windows</SupportedOSPlatforms>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/src/libraries/System.Data.OleDb/src/System.Data.OleDb.csproj b/src/libraries/System.Data.OleDb/src/System.Data.OleDb.csproj
@@ -8,7 +8,6 @@
     <NoWarn>$(NoWarn);CA2249</NoWarn>
     <!-- Suppress SYSLIB0004: 'RuntimeHelpers.PrepareConstrainedRegions()' is obsolete to avoid ifdefs. -->
     <NoWarn>$(NoWarn);SYSLIB0004</NoWarn>
-    <IsAotCompatible>false</IsAotCompatible>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>
     <PackageDescription>Provides a collection of classes for OLEDB.

diff --git a/src/libraries/System.DirectoryServices.AccountManagement/Directory.Build.props b/src/libraries/System.DirectoryServices.AccountManagement/Directory.Build.props
@@ -3,5 +3,6 @@
   <PropertyGroup>
     <StrongNameKeyId>ECMA</StrongNameKeyId>
     <SupportedOSPlatforms>windows</SupportedOSPlatforms>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/...DirectoryServices.AccountManagement/src/System.DirectoryServices.AccountManagement.csproj b/...DirectoryServices.AccountManagement/src/System.DirectoryServices.AccountManagement.csproj
@@ -7,7 +7,6 @@
     <IncludeDllSafeSearchPathAttribute>true</IncludeDllSafeSearchPathAttribute>
     <NoWarn>$(NoWarn);CA2249</NoWarn>
     <NoWarn>$(NoWarn);IDE0059;IDE0060;CA1822;CA1859</NoWarn>
-    <IsAotCompatible>false</IsAotCompatible>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>
     <AddNETFrameworkPlaceholderFileToPackage>true</AddNETFrameworkPlaceholderFileToPackage>

diff --git a/src/libraries/System.DirectoryServices.Protocols/Directory.Build.props b/src/libraries/System.DirectoryServices.Protocols/Directory.Build.props
@@ -4,5 +4,6 @@
     <StrongNameKeyId>Microsoft</StrongNameKeyId>
     <IncludePlatformAttributes>true</IncludePlatformAttributes>
     <UnsupportedOSPlatforms>browser;android;ios;tvos</UnsupportedOSPlatforms>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/...ibraries/System.DirectoryServices.Protocols/src/System.DirectoryServices.Protocols.csproj b/...ibraries/System.DirectoryServices.Protocols/src/System.DirectoryServices.Protocols.csproj
@@ -12,7 +12,6 @@
     <PackageDescription>Provides the methods defined in the Lightweight Directory Access Protocol (LDAP) version 3 (V3) and Directory Services Markup Language (DSML) version 2.0 (V2) standards.</PackageDescription>
     <!-- CS3016: Arrays as attribute arguments is not CLS-compliant -->
     <NoWarn>$(NoWarn);CS3016</NoWarn>
-    <IsAotCompatible>false</IsAotCompatible>
 
     <!-- TODO https://github.com/dotnet/runtime/issues/90400: Annotate for nullable reference types -->
     <Nullable>disable</Nullable>

diff --git a/src/libraries/System.DirectoryServices/Directory.Build.props b/src/libraries/System.DirectoryServices/Directory.Build.props
@@ -3,5 +3,6 @@
   <PropertyGroup>
     <StrongNameKeyId>Microsoft</StrongNameKeyId>
     <SupportedOSPlatforms>windows</SupportedOSPlatforms>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/src/libraries/System.DirectoryServices/src/System.DirectoryServices.csproj b/src/libraries/System.DirectoryServices/src/System.DirectoryServices.csproj
@@ -6,7 +6,6 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <IncludeInternalObsoleteAttribute>true</IncludeInternalObsoleteAttribute>
     <NoWarn>$(NoWarn);IDE0059;IDE0060;CA1822;CA1865</NoWarn>
-    <IsAotCompatible>false</IsAotCompatible>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>
     <AddNETFrameworkPlaceholderFileToPackage>true</AddNETFrameworkPlaceholderFileToPackage>

diff --git a/src/libraries/System.Reflection.Context/Directory.Build.props b/src/libraries/System.Reflection.Context/Directory.Build.props
@@ -2,5 +2,6 @@
   <Import Project="..\Directory.Build.props" />
   <PropertyGroup>
     <StrongNameKeyId>ECMA</StrongNameKeyId>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/src/libraries/System.Reflection.Context/src/System.Reflection.Context.csproj b/src/libraries/System.Reflection.Context/src/System.Reflection.Context.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.1;netstandard2.0</TargetFrameworks>
-    <IsAotCompatible>false</IsAotCompatible>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>
     <AddNETFrameworkPlaceholderFileToPackage>true</AddNETFrameworkPlaceholderFileToPackage>

diff --git a/src/libraries/System.Reflection.MetadataLoadContext/Directory.Build.props b/src/libraries/System.Reflection.MetadataLoadContext/Directory.Build.props
@@ -0,0 +1,6 @@
+<Project>
+  <Import Project="..\Directory.Build.props" />
+  <PropertyGroup>
+    <IsAotCompatible>false</IsAotCompatible>
+  </PropertyGroup>
+</Project>
diff --git a/...es/System.Reflection.MetadataLoadContext/src/System.Reflection.MetadataLoadContext.csproj b/...es/System.Reflection.MetadataLoadContext/src/System.Reflection.MetadataLoadContext.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
     <RootNamespace>System.Reflection</RootNamespace>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <IsAotCompatible>false</IsAotCompatible>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>
     <NoWarn>$(NoWarn);CA1865</NoWarn>

diff --git a/src/libraries/System.Resources.Extensions/Directory.Build.props b/src/libraries/System.Resources.Extensions/Directory.Build.props
@@ -0,0 +1,6 @@
+<Project>
+  <Import Project="..\Directory.Build.props" />
+  <PropertyGroup>
+    <IsAotCompatible>false</IsAotCompatible>
+  </PropertyGroup>
+</Project>
diff --git a/src/libraries/System.Resources.Extensions/src/System.Resources.Extensions.csproj b/src/libraries/System.Resources.Extensions/src/System.Resources.Extensions.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <DefineConstants>$(DefineConstants);RESOURCES_EXTENSIONS</DefineConstants>
-    <IsAotCompatible>false</IsAotCompatible>
     <IncludeInternalObsoleteAttribute>true</IncludeInternalObsoleteAttribute>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>

@@ -3,5 +3,6 @@
   <PropertyGroup>
     <StrongNameKeyId>Microsoft</StrongNameKeyId>
     <IncludePlatformAttributes>true</IncludePlatformAttributes>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/src/libraries/System.Runtime.Serialization.Schema/Directory.Build.props b/src/libraries/System.Runtime.Serialization.Schema/Directory.Build.props
@@ -5,5 +5,6 @@
     <IncludePlatformAttributes>true</IncludePlatformAttributes>
     <!-- This exclusion list matches System.CodeDom. -->
     <UnsupportedOSPlatforms>browser;wasi;ios;tvos;maccatalyst</UnsupportedOSPlatforms>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/...raries/System.Runtime.Serialization.Schema/src/System.Runtime.Serialization.Schema.csproj b/...raries/System.Runtime.Serialization.Schema/src/System.Runtime.Serialization.Schema.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum)</TargetFrameworks>
-    <IsAotCompatible>false</IsAotCompatible>
     <IsPackable>true</IsPackable>
     <PackageDescription>Provides support for importing and exporting xsd schemas for DataContractSerializer.
 

diff --git a/src/libraries/System.ServiceModel.Syndication/Directory.Build.props b/src/libraries/System.ServiceModel.Syndication/Directory.Build.props
@@ -0,0 +1,6 @@
+<Project>
+  <Import Project="..\Directory.Build.props" />
+  <PropertyGroup>
+    <IsAotCompatible>false</IsAotCompatible>
+  </PropertyGroup>
+</Project>
diff --git a/src/libraries/System.ServiceModel.Syndication/src/System.ServiceModel.Syndication.csproj b/src/libraries/System.ServiceModel.Syndication/src/System.ServiceModel.Syndication.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppPrevious);$(NetCoreAppMinimum);netstandard2.0;$(NetFrameworkMinimum)</TargetFrameworks>
-    <IsAotCompatible>false</IsAotCompatible>
     <IncludePlatformAttributes>true</IncludePlatformAttributes>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>

diff --git a/src/libraries/System.Windows.Extensions/Directory.Build.props b/src/libraries/System.Windows.Extensions/Directory.Build.props
@@ -3,5 +3,6 @@
   <PropertyGroup>
     <StrongNameKeyId>Open</StrongNameKeyId>
     <SupportedOSPlatforms>windows</SupportedOSPlatforms>
+    <IsAotCompatible>false</IsAotCompatible>
   </PropertyGroup>
 </Project>
diff --git a/src/libraries/System.Windows.Extensions/src/System.Windows.Extensions.csproj b/src/libraries/System.Windows.Extensions/src/System.Windows.Extensions.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent);$(NetCoreAppMinimum)-windows;$(NetCoreAppMinimum)</TargetFrameworks>
     <TargetFrameworks Condition="'$(NetCoreAppPrevious)' != ''">$(TargetFrameworks);$(NetCoreAppPrevious)-windows;$(NetCoreAppPrevious)</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <IsAotCompatible>false</IsAotCompatible>
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
     <IsPackable>true</IsPackable>
     <PackageDescription>Provides miscellaneous Windows-specific types