Adding missing SDK assets for Publish (dotnet#67765)

* Adding missing SDK assets for Publish

* FB

* build break fix

* case senstive dir fix

* adding comments to the targets file

src/coreclr/nativeaot/BuildIntegration/Microsoft.DotNet.ILCompiler.targets

@@ -36,18 +36,30 @@
     <ImportRuntimeIlcPackageTargetDependsOn>RunResolvePackageDependencies</ImportRuntimeIlcPackageTargetDependsOn>
     <IlcSetupPropertiesDependsOn>ImportRuntimeIlcPackageTarget</IlcSetupPropertiesDependsOn>
     <IlcDynamicBuildPropertyDependencies>SetupProperties</IlcDynamicBuildPropertyDependencies>
-
+        
   </PropertyGroup>
 
   <!-- Locate the runtime package according to the current target runtime -->
   <Target Name="ImportRuntimeIlcPackageTarget" Condition="'$(BuildingFrameworkLibrary)' != 'true' AND $(IlcCalledViaPackage) == 'true'" DependsOnTargets="$(ImportRuntimeIlcPackageTargetDependsOn)" BeforeTargets="Publish">
+    <!-- This targets file is imported by the SDK when the PublishAot property is set. SDK resolves runtime package paths differently-->
+    <Error Condition="'@(ResolvedILCompilerPack)' == '' AND '$(PublishAot)' == 'true'" Text="The PackageDefinitions ItemGroup is required for target ImportRuntimeIlcPackageTarget" />
     <!-- CoreRT SDK and Framework Assemblies need to be defined to avoid CoreCLR implementations being set as compiler inputs -->
-    <Error Condition="'@(PackageDefinitions)' == ''" Text="The PackageDefinitions ItemGroup is required for target ImportRuntimeIlcPackageTarget" />
+    <Error Condition="'@(PackageDefinitions)' == '' AND '$(PublishAot)' != 'true'" Text="The PackageDefinitions ItemGroup is required for target ImportRuntimeIlcPackageTarget" />
+
 
-    <PropertyGroup>
+    <!-- This targets file is imported by the SDK when the PublishAot property is set. Use the SDK runtime package resolve property to set  down stream properties -->
+    <PropertyGroup Condition="'$(PublishAot)' == 'true'">
+      <RuntimePackagePath>@(ResolvedILCompilerPack->'%(PackageDirectory)')</RuntimePackagePath>
+      <IlcHostPackagePath>@(ResolvedILCompilerPack->'%(PackageDirectory)')</IlcHostPackagePath>
+      <IlcPath>>@(ResolvedILCompilerPack->'%(PackageDirectory)')</IlcPath>
+    </PropertyGroup>
+
+    <!-- Use the non-SDK runtime package resolve property to set down stream properties if SDK is not involved -->
+    <PropertyGroup Condition="'$(PublishAot)' != 'true'">
       <RuntimePackagePath Condition="'%(PackageDefinitions.Name)' == '$(RuntimeIlcPackageName)'">%(PackageDefinitions.ResolvedPath)</RuntimePackagePath>
       <IlcHostPackagePath Condition="'%(PackageDefinitions.Name)' == '$(IlcHostPackageName)'">%(PackageDefinitions.ResolvedPath)</IlcHostPackagePath>
     </PropertyGroup>
+
   </Target>
 
   <Import Project="$(MSBuildThisFileDirectory)\Microsoft.NETCore.Native.targets" />

src/installer/pkg/projects/Microsoft.DotNet.ILCompiler/Microsoft.DotNet.ILCompiler.pkgproj

@@ -20,6 +20,7 @@
     <ItemGroup>
       <File Include="$(CoreCLRBuildIntegrationDir)*" TargetPath="build" />
       <File Include="$(CoreCLRILCompilerDir)netstandard\*" TargetPath="tools/netstandard" />
+      <File Include="sdk\Sdk.targets" TargetPath="sdk" />
     </ItemGroup>
   </Target>
 

src/installer/pkg/projects/Microsoft.DotNet.ILCompiler/sdk/Sdk.targets

@@ -0,0 +1,17 @@
+<!--
+***********************************************************************************************
+Sdk.props
+
+WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and have
+          created a backup copy.  Incorrect changes to this file will make it
+          impossible to load or build your projects from the command-line or the IDE.
+
+Copyright (c) .NET Foundation. All rights reserved.
+***********************************************************************************************
+-->
+<Project>
+
+  <!-- Only import the build props if the ILLink.Tasks package isn't referenced via NuGet. -->
+  <Import Project="$(MSBuildThisFileDirectory)..\build\Microsoft.DotNet.ILCompiler.targets" Condition="'$(PublishAot)' == 'true'"/>
+
+</Project>