diff --git a/.gitmodules b/.gitmodules
index 7f698f8eaf..81e8e6813e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -63,3 +63,6 @@
 [submodule "src/roslyn-tools"]
 	path = src/roslyn-tools
 	url = https://github.com/dotnet/roslyn-tools
+[submodule "src/linker"]
+	path = src/linker
+	url = https://github.com/mono/linker.git
diff --git a/dependencies.props b/dependencies.props
index 2e33eb7f62..239654d0ed 100644
--- a/dependencies.props
+++ b/dependencies.props
@@ -17,12 +17,6 @@
     <CurrentRefXmlPath>$(MSBuildThisFileFullPath)</CurrentRefXmlPath>
   </PropertyGroup>
 
-  <!-- ILLink.Tasks package version -->
-  <PropertyGroup>
-    <ILLinkTasksPackage>ILLink.Tasks</ILLinkTasksPackage>
-    <ILLinkTasksPackageVersion>0.1.5-preview-1461378</ILLinkTasksPackageVersion>
-  </PropertyGroup>
-
   <!--
     Packages built by ProdCon, but not source-build. These are included as prebuilts, or embedded in
     the product as version strings to be used by the SDK to fetch extra content.
diff --git a/init-tools.msbuild b/init-tools.msbuild
index 3d2c5d055a..1d7a7eb1e7 100644
--- a/init-tools.msbuild
+++ b/init-tools.msbuild
@@ -11,6 +11,5 @@
                       Condition="'$(BuildToolsPackageVersion)' != ''"
                       Version="$(BuildToolsPackageVersion)" />
     <PackageReference Include="Microsoft.DotNet.BuildTools.Coreclr" Version="1.0.4-prerelease" />
-    <PackageReference Include="$(ILLinkTasksPackage)" Version="$(ILLinkTasksPackageVersion)" />
   </ItemGroup>
 </Project>
diff --git a/patches/linker/0001-Add-an-option-to-use-reflection-heuristics-during-ma.patch b/patches/linker/0001-Add-an-option-to-use-reflection-heuristics-during-ma.patch
new file mode 100644
index 0000000000..799cc981dd
--- /dev/null
+++ b/patches/linker/0001-Add-an-option-to-use-reflection-heuristics-during-ma.patch
@@ -0,0 +1,197 @@
+From d438b2ff6ae4b90424267f8c46f72d25349af76d Mon Sep 17 00:00:00 2001
+From: Eugene Rozenfeld <erozen@microsoft.com>
+Date: Tue, 4 Apr 2017 23:27:47 -0700
+Subject: [PATCH] Add an option to use reflection heuristics during marking
+ step.
+
+This change adds a -h option that can specify heuristics for keeping
+types/methods/fields that may be needed for reflection. Three simple
+and coarse-grained heuristic options are added initially (all are off by default):
+
+1. "LdtokenTypeMethods": mark all methods of types whose token is used
+in an ldtoken instruction.
+2. "LdtokenTypeFields": mark all fields of types whose token is used
+in an ldtoken instruction.
+3. "InstanceConstructors": mark all instance constructors in types
+where an instance member has been marked but none of the instance
+constructors have been marked. (The type is likely to be instantiated via CreateInstance).
+
+When -h is specified MarkStep is replaced with MarkStepWithReflectionHeuristics that
+derives from MarkStep. The names of heuristics are specified in a comma-separated list.
+More heuristics will be added over time and any subset of them can be used for a particular
+linker invocation.
+
+https://github.com/dotnet/source-build/issues/777 tracks removing this patch.
+---
+ .../MarkStepWithReflectionHeuristics.cs       | 98 +++++++++++++++++++
+ linker/Linker/Driver.cs                       | 22 +++++
+ linker/Mono.Linker.csproj                     |  1 +
+ 3 files changed, 121 insertions(+)
+ create mode 100644 linker/Linker.Steps/MarkStepWithReflectionHeuristics.cs
+
+diff --git a/linker/Linker.Steps/MarkStepWithReflectionHeuristics.cs b/linker/Linker.Steps/MarkStepWithReflectionHeuristics.cs
+new file mode 100644
+index 0000000..3cb98b1
+--- /dev/null
++++ b/linker/Linker.Steps/MarkStepWithReflectionHeuristics.cs
+@@ -0,0 +1,98 @@
++using System;
++using System.Collections;
++using System.Collections.Generic;
++
++using Mono.Cecil;
++using Mono.Cecil.Cil;
++
++namespace Mono.Linker.Steps {
++
++	public class MarkStepWithReflectionHeuristics : MarkStep {
++
++		protected ICollection<string> _reflectionHeuristics;
++
++		public MarkStepWithReflectionHeuristics (ICollection<string> reflectionHeuristics)
++		{
++			_reflectionHeuristics = reflectionHeuristics;
++		}
++
++		protected override void MarkInstruction (Instruction instruction)
++		{
++			base.MarkInstruction (instruction);
++
++			if (instruction.OpCode == OpCodes.Ldtoken) {
++				object token = instruction.Operand;
++				if (token is TypeReference) {
++					TypeDefinition type = ResolveTypeDefinition (GetOriginalType (((TypeReference) token)));
++					if (type != null) {
++						if (_reflectionHeuristics.Contains ("LdtokenTypeMethods")) {
++							MarkMethods (type);
++						}
++						if (_reflectionHeuristics.Contains  ("LdtokenTypeFields")) {
++							MarkFields (type, includeStatic: true);
++						}
++					}
++				}
++			}
++		}
++
++		protected override void DoAdditionalProcessing()
++		{
++			if (_reflectionHeuristics.Contains ("InstanceConstructors")) {
++				ProcessConstructors ();
++			}
++		}
++
++		void ProcessConstructors()
++		{
++			foreach (AssemblyDefinition assembly in _context.GetAssemblies ()) {
++				foreach (TypeDefinition type in assembly.MainModule.Types) {
++					ProcessConstructors (type);
++				}
++			}
++		}
++
++		void ProcessConstructors(TypeDefinition type)
++		{
++			if (Annotations.IsMarked (type)) {
++
++				bool hasMarkedConstructors = false;
++				bool hasMarkedInstanceMember = false;
++				foreach (var method in type.Methods) {
++					if (Annotations.IsMarked (method)) {
++						if (!method.IsStatic) {
++							hasMarkedInstanceMember = true;
++						}
++
++						if (IsInstanceConstructor (method)) {
++							hasMarkedConstructors = true;
++						}
++
++						if (hasMarkedInstanceMember && hasMarkedConstructors) {
++							break;
++						}
++					}
++				}
++
++				if (!hasMarkedConstructors) {
++					if (!hasMarkedInstanceMember) {
++						foreach (var field in type.Fields) {
++							if (!field.IsStatic && Annotations.IsMarked (field)) {
++								hasMarkedInstanceMember = true;
++								break;
++							}
++						}
++					}
++
++					if (hasMarkedInstanceMember) {
++						MarkMethodsIf (type.Methods, IsInstanceConstructor);
++					}
++				}
++
++				foreach (var nestedType in type.NestedTypes) {
++					ProcessConstructors (nestedType);
++				}
++			}
++		}
++	}
++}
+diff --git a/linker/Linker/Driver.cs b/linker/Linker/Driver.cs
+index 8a380db..0d6a9f6 100644
+--- a/linker/Linker/Driver.cs
++++ b/linker/Linker/Driver.cs
+@@ -232,6 +232,10 @@ namespace Mono.Linker {
+ 					case 'v':
+ 						context.KeepMembersForDebugger = bool.Parse (GetParam ());
+ 						break;
++					case 'h':
++						ICollection<string> reflectionHeuristics = ParseReflectionHeuristics (GetParam ());
++						p.ReplaceStep (typeof (MarkStep), new MarkStepWithReflectionHeuristics (reflectionHeuristics));
++						break;
+ 					default:
+ 						Usage ("Unknown option: `" + token [1] + "'");
+ 						break;
+@@ -340,6 +344,15 @@ namespace Mono.Linker {
+ 			return assemblies;
+ 		}
+ 
++		protected static ICollection<string> ParseReflectionHeuristics(string str)
++		{
++			HashSet<string> heuristics = new HashSet<string> (StringComparer.OrdinalIgnoreCase);
++			string[] parts = str.Split (',');
++			foreach (string part in parts)
++				heuristics.Add (part);
++
++			return heuristics;
++		}
+ 
+ 		AssemblyAction ParseAssemblyAction (string s)
+ 		{
+@@ -399,6 +412,15 @@ namespace Mono.Linker {
+ 			Console.WriteLine ("   -b                  Generate debug symbols for each linked module (true or false)");
+ 			Console.WriteLine ("   -g                  Generate a new unique guid for each linked module (true or false)");
+ 			Console.WriteLine ("   -v                  Keep members needed by debugger (true or false)");
++			Console.WriteLine ("   -h                  List of reflection heuristics separated with a comma.");
++			Console.WriteLine ("                       Supported heuristics:");
++			Console.WriteLine ("                         LdtokenTypeMethods:   mark all methods of types whose token is used");
++			Console.WriteLine ("                                               in an ldtoken instruction");
++			Console.WriteLine ("                         LdtokenTypeFields:    mark all fields of types whose token is used");
++			Console.WriteLine ("                                               in an ldtoken instruction");
++			Console.WriteLine ("                         InstanceConstructors: mark all instance constructors in types");
++			Console.WriteLine ("                                               where an instance member has been marked but");
++			Console.WriteLine ("                                               none of the instance constructors have been marked");
+ 			Console.WriteLine ("   -l                  List of i18n assemblies to copy to the output directory");
+ 			Console.WriteLine ("                         separated with a comma: none,all,cjk,mideast,other,rare,west");
+ 			Console.WriteLine ("                         default is all");
+diff --git a/linker/Mono.Linker.csproj b/linker/Mono.Linker.csproj
+index d328491..4e8f143 100644
+--- a/linker/Mono.Linker.csproj
++++ b/linker/Mono.Linker.csproj
+@@ -70,6 +70,7 @@
+     <Compile Include="Linker.Steps\IStep.cs" />
+     <Compile Include="Linker.Steps\LoadReferencesStep.cs" />
+     <Compile Include="Linker.Steps\MarkStep.cs" />
++    <Compile Include="Linker.Steps\MarkStepWithReflectionHeuristics.cs" />
+     <Compile Include="Linker.Steps\OutputStep.cs" />
+     <Compile Include="Linker.Steps\ResolveFromXApiStep.cs" />
+     <Compile Include="Linker.Steps\ResolveFromAssemblyStep.cs" />
+-- 
+2.17.1.windows.2
+
diff --git a/repos/coreclr.proj b/repos/coreclr.proj
index e6fa46fe13..ad122f7d3f 100644
--- a/repos/coreclr.proj
+++ b/repos/coreclr.proj
@@ -17,6 +17,10 @@
     <OfficialBuildId>20180814-03</OfficialBuildId>
   </PropertyGroup>
 
+  <ItemGroup>
+    <RepositoryReference Include="linker" />
+  </ItemGroup>
+
   <ItemGroup>
     <EnvironmentVariables Include="OfficialBuildId=$(OfficialBuildId)" />
   </ItemGroup>
diff --git a/repos/corefx.proj b/repos/corefx.proj
index b776499d0b..a0942825cf 100644
--- a/repos/corefx.proj
+++ b/repos/corefx.proj
@@ -9,7 +9,7 @@
     <OverrideTargetRid Condition="'$(TargetOS)' == 'OSX'">osx-x64</OverrideTargetRid>
 
     <BuildArguments>-$(Configuration) -buildArch=$(Platform) -portable=$(OverridePortableBuild) -BuildTests=false -PackageRid=$(OverrideTargetRid)</BuildArguments>
-    <BuildCommand>$(ProjectDirectory)/build$(ShellExtension) $(BuildArguments) -- /p:ILLinkTrimAssembly=false /bl</BuildCommand>
+    <BuildCommand>$(ProjectDirectory)/build$(ShellExtension) $(BuildArguments) -- /bl</BuildCommand>
     <BuildCommand Condition="$(Platform.Contains('arm'))">$(ArmEnvironmentVariables) $(BuildCommand)</BuildCommand>
     <PackagesOutput>$(ProjectDirectory)/bin/packages/$(Configuration)</PackagesOutput>
     <CleanCommand>$(ProjectDirectory)/clean$(ShellExtension)</CleanCommand>
@@ -17,6 +17,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <RepositoryReference Include="linker" />
     <RepositoryReference Include="coreclr" />
     <RepositoryReference Include="standard" />
   </ItemGroup>
diff --git a/repos/linker.proj b/repos/linker.proj
new file mode 100644
index 0000000000..a7da012101
--- /dev/null
+++ b/repos/linker.proj
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))/dir.props" />
+  <PropertyGroup>
+    <!-- Package version is pinned to what CoreFX expects because CoreFX doesn't take an override property. -->
+    <ILLinkTasksPackageId>ILLink.Tasks</ILLinkTasksPackageId>
+    <ILLinkTasksPackageVersion>0.1.5-preview-1461378</ILLinkTasksPackageVersion>
+
+    <BuildCommandArgs>restore /bl:restore.binlog</BuildCommandArgs>
+    <BuildCommandArgs>$(BuildCommandArgs) $(ProjectDirectory)corebuild/integration/linker.sln</BuildCommandArgs>
+
+    <!-- These are intended to be auto-detected via NuGetRestoreTargets, but it doesn't seem to work. -->
+    <BuildCommandArgs>$(BuildCommandArgs) /p:ILLinkBuild=true</BuildCommandArgs>
+    <BuildCommandArgs>$(BuildCommandArgs) /p:NetStandard=true</BuildCommandArgs>
+
+    <BuildCommand>$(DotnetToolCommand) $(BuildCommandArgs)</BuildCommand>
+
+    <BuildPackagesCommandArgs>pack /bl:pack.binlog</BuildPackagesCommandArgs>
+    <BuildPackagesCommandArgs>$(BuildPackagesCommandArgs) /p:Version=$(ILLinkTasksPackageVersion)</BuildPackagesCommandArgs>
+    <BuildPackagesCommandArgs>$(BuildPackagesCommandArgs) $(ProjectDirectory)corebuild/integration/ILLink.Tasks/ILLink.Tasks.csproj</BuildPackagesCommandArgs>
+    <BuildPackagesCommand>$(DotnetToolCommand) $(BuildPackagesCommandArgs)</BuildPackagesCommand>
+
+    <PackagesOutput>$(ProjectDirectory)corebuild/integration/bin/nupkgs</PackagesOutput>
+
+    <RepoApiImplemented>false</RepoApiImplemented>
+    <OrchestratedManifestBuildName>N/A</OrchestratedManifestBuildName>
+  </PropertyGroup>
+
+  <!-- Extract this package into packages dir, because repos assume it's restored as a tool. -->
+  <Target Name="ExtractLinkerPackageToCache"
+          AfterTargets="Package">
+    <PropertyGroup>
+      <ILLinkTasksPackageFile>$(PackagesOutput)/$(ILLinkTasksPackageId).$(ILLinkTasksPackageVersion).nupkg</ILLinkTasksPackageFile>
+      <ILLinkTasksPackageIdToLower>$(ILLinkTasksPackageId.ToLowerInvariant())</ILLinkTasksPackageIdToLower>
+    </PropertyGroup>
+
+    <Message Importance="high" Text="Extracting $(ILLinkTasksPackageFile) to package cache..." />
+
+    <ZipFileExtractToDirectory SourceArchive="$(ILLinkTasksPackageFile)"
+                               DestinationDirectory="$(PackagesDir)$(ILLinkTasksPackageIdToLower)/$(ILLinkTasksPackageVersion)/"
+                               OverwriteDestination="true" />
+  </Target>
+
+  <!-- Replace file includes in nuspec as recommended in the linker repo's ./corebuild/README.md -->
+  <Target Name="ReplaceNuspecDllIncludeLines" BeforeTargets="Build">
+    <PropertyGroup>
+      <LinkerTasksNuspecFile>$(ProjectDirectory)corebuild/integration/ILLink.Tasks/ILLink.Tasks.nuspec</LinkerTasksNuspecFile>
+      <NuspecFileContents>
+        <![CDATA[<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+  <metadata>
+    <id>$id$</id>
+    <version>$version$</version>
+    <authors>$authors$</authors>
+    <description>$description$</description>
+  </metadata>
+  <files>
+    <file src="ILLink.Tasks.targets" target="build" />
+    <file src="ILLink.CrossGen.targets" target="build" />
+    <file src="netcoreapp2.0/**/*.dll" target="tools/netcoreapp2.0" />
+  </files>
+</package>
+]]>
+      </NuspecFileContents>
+    </PropertyGroup>
+
+    <WriteLinesToFile File="$(LinkerTasksNuspecFile)"
+                      Lines="$(NuspecFileContents)"
+                      Overwrite="true" />
+  </Target>
+
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))/dir.targets" />
+</Project>
diff --git a/src/linker b/src/linker
new file mode 160000
index 0000000000..9e8bcb4075
--- /dev/null
+++ b/src/linker
@@ -0,0 +1 @@
+Subproject commit 9e8bcb40755c4ec007b6ca89618968b7c5f6fe58
diff --git a/tools-local/prebuilt-baseline-offline.xml b/tools-local/prebuilt-baseline-offline.xml
index 45e39913cf..0431ac1876 100644
--- a/tools-local/prebuilt-baseline-offline.xml
+++ b/tools-local/prebuilt-baseline-offline.xml
@@ -11,6 +11,7 @@
     <Dir>src/corefx/</Dir>
     <Dir>src/fsharp/</Dir>
     <Dir>src/known-good/</Dir>
+    <Dir>src/linker/</Dir>
     <Dir>src/msbuild/</Dir>
     <Dir>src/netcorecli-fsc/</Dir>
     <Dir>src/newtonsoft-json/</Dir>
@@ -49,7 +50,6 @@
     <Usage Id="fmdev.xlftool" Version="0.1.3" />
     <Usage Id="fmdev.XliffParser" Version="0.5.3" />
     <Usage Id="FSharp.Core" Version="4.3.4" />
-    <Usage Id="ILLink.Tasks" Version="0.1.5-preview-1461378" />
     <Usage Id="Libuv" Version="1.9.1" />
     <Usage Id="MicroBuild.Core" Version="0.2.0" />
     <Usage Id="Microsoft.3rdpartytools.MarkdownLog" Version="0.10.0-alpha-experimental" />
@@ -136,6 +136,7 @@
     <Usage Id="Microsoft.NETCore.App" Version="1.0.5" />
     <Usage Id="Microsoft.NETCore.App" Version="1.1.1" />
     <Usage Id="Microsoft.NETCore.App" Version="1.1.2" />
+    <Usage Id="Microsoft.NETCore.App" Version="2.0.0-beta-001509-00" />
     <Usage Id="Microsoft.NETCore.App" Version="2.0.0" />
     <Usage Id="Microsoft.NETCore.App" Version="2.1.0-preview1-26116-04" />
     <Usage Id="Microsoft.NETCore.App" Version="2.1.0-preview2-26406-04" />
@@ -170,6 +171,7 @@
     <Usage Id="Microsoft.NETCore.Platforms" Version="1.0.2-beta-24224-02" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="1.0.2" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="1.1.0" />
+    <Usage Id="Microsoft.NETCore.Platforms" Version="2.0.0-beta-25006-01" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="2.0.0" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="2.1.0-preview1-26116-01" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="2.1.0-preview2-26406-04" />
@@ -216,6 +218,7 @@
     <Usage Id="Microsoft.xunit.netcore.extensions" Version="2.1.0-rc1-03006-01" />
     <Usage Id="NETStandard.Library" Version="1.6.0" />
     <Usage Id="NETStandard.Library" Version="1.6.1" />
+    <Usage Id="NETStandard.Library" Version="2.0.0-beta-25006-01" />
     <Usage Id="NETStandard.Library" Version="2.0.0" />
     <Usage Id="NETStandard.Library" Version="2.0.1" />
     <Usage Id="NETStandard.Library.NETFramework" Version="2.0.1-servicing-26011-01" />
@@ -225,32 +228,42 @@
     <Usage Id="NuGet.CommandLine" Version="3.4.3" />
     <Usage Id="NuGet.Commands" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
     <Usage Id="NuGet.Common" Version="4.0.0-rtm-2283" />
+    <Usage Id="NuGet.Common" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Common" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Common" Version="4.3.0" />
     <Usage Id="NuGet.Common" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
+    <Usage Id="NuGet.Configuration" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Configuration" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Configuration" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
     <Usage Id="NuGet.Credentials" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
+    <Usage Id="NuGet.DependencyResolver.Core" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.DependencyResolver.Core" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.DependencyResolver.Core" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
     <Usage Id="NuGet.Frameworks" Version="4.0.0-rtm-2283" />
+    <Usage Id="NuGet.Frameworks" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Frameworks" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Frameworks" Version="4.3.0" />
     <Usage Id="NuGet.Frameworks" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
+    <Usage Id="NuGet.LibraryModel" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.LibraryModel" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.LibraryModel" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
     <Usage Id="NuGet.Packaging" Version="4.0.0-rtm-2283" />
+    <Usage Id="NuGet.Packaging" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Packaging" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Packaging" Version="4.3.0" />
     <Usage Id="NuGet.Packaging" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
+    <Usage Id="NuGet.Packaging.Core" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Packaging.Core" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Packaging.Core" Version="4.3.0" />
     <Usage Id="NuGet.Packaging.Core" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
+    <Usage Id="NuGet.ProjectModel" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.ProjectModel" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.ProjectModel" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
+    <Usage Id="NuGet.Protocol" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Protocol" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Protocol" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
     <Usage Id="NuGet.Versioning" Version="4.0.0-rtm-2283" />
+    <Usage Id="NuGet.Versioning" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Versioning" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Versioning" Version="4.3.0" />
     <Usage Id="NuGet.Versioning" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
diff --git a/tools-local/prebuilt-baseline-online.xml b/tools-local/prebuilt-baseline-online.xml
index eb89ae0737..5791fe52aa 100644
--- a/tools-local/prebuilt-baseline-online.xml
+++ b/tools-local/prebuilt-baseline-online.xml
@@ -11,6 +11,7 @@
     <Dir>src/corefx/</Dir>
     <Dir>src/fsharp/</Dir>
     <Dir>src/known-good/</Dir>
+    <Dir>src/linker/</Dir>
     <Dir>src/msbuild/</Dir>
     <Dir>src/netcorecli-fsc/</Dir>
     <Dir>src/newtonsoft-json/</Dir>
@@ -37,7 +38,6 @@
     <Usage Id="fmdev.xlftool" Version="0.1.3" />
     <Usage Id="fmdev.XliffParser" Version="0.5.3" />
     <Usage Id="FSharp.Core" Version="4.3.4" />
-    <Usage Id="ILLink.Tasks" Version="0.1.5-preview-1461378" />
     <Usage Id="Libuv" Version="1.9.1" />
     <Usage Id="MicroBuild.Core" Version="0.2.0" />
     <Usage Id="Microsoft.3rdpartytools.MarkdownLog" Version="0.10.0-alpha-experimental" />
@@ -125,6 +125,7 @@
     <Usage Id="Microsoft.NETCore.App" Version="1.0.5" />
     <Usage Id="Microsoft.NETCore.App" Version="1.1.1" />
     <Usage Id="Microsoft.NETCore.App" Version="1.1.2" />
+    <Usage Id="Microsoft.NETCore.App" Version="2.0.0-beta-001509-00" />
     <Usage Id="Microsoft.NETCore.App" Version="2.0.0" />
     <Usage Id="Microsoft.NETCore.App" Version="2.1.0-preview1-26116-04" />
     <Usage Id="Microsoft.NETCore.App" Version="2.1.0-preview2-26406-04" />
@@ -162,6 +163,7 @@
     <Usage Id="Microsoft.NETCore.Platforms" Version="1.0.2-beta-24224-02" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="1.0.2" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="1.1.0" />
+    <Usage Id="Microsoft.NETCore.Platforms" Version="2.0.0-beta-25006-01" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="2.0.0" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="2.1.0-preview1-26116-01" />
     <Usage Id="Microsoft.NETCore.Platforms" Version="2.1.0-preview2-26406-04" />
@@ -209,6 +211,7 @@
     <Usage Id="Microsoft.xunit.netcore.extensions" Version="2.1.0-rc1-03006-01" />
     <Usage Id="NETStandard.Library" Version="1.6.0" />
     <Usage Id="NETStandard.Library" Version="1.6.1" />
+    <Usage Id="NETStandard.Library" Version="2.0.0-beta-25006-01" />
     <Usage Id="NETStandard.Library" Version="2.0.0" />
     <Usage Id="NETStandard.Library" Version="2.0.1" />
     <Usage Id="NETStandard.Library.NETFramework" Version="2.0.1-servicing-26011-01" />
@@ -218,32 +221,42 @@
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     <Usage Id="NuGet.Common" Version="4.0.0-rtm-2283" />
+    <Usage Id="NuGet.Common" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Common" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Common" Version="4.3.0" />
     <Usage Id="NuGet.Common" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
+    <Usage Id="NuGet.Configuration" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Configuration" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Configuration" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
     <Usage Id="NuGet.Credentials" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
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     <Usage Id="NuGet.DependencyResolver.Core" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.DependencyResolver.Core" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
     <Usage Id="NuGet.Frameworks" Version="4.0.0-rtm-2283" />
+    <Usage Id="NuGet.Frameworks" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Frameworks" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Frameworks" Version="4.3.0" />
     <Usage Id="NuGet.Frameworks" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
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     <Usage Id="NuGet.LibraryModel" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.LibraryModel" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
     <Usage Id="NuGet.Packaging" Version="4.0.0-rtm-2283" />
+    <Usage Id="NuGet.Packaging" Version="4.3.0-preview1-2500" />
     <Usage Id="NuGet.Packaging" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Packaging" Version="4.3.0" />
     <Usage Id="NuGet.Packaging" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
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     <Usage Id="NuGet.Packaging.Core" Version="4.3.0" />
     <Usage Id="NuGet.Packaging.Core" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
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     <Usage Id="NuGet.ProjectModel" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.ProjectModel" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
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     <Usage Id="NuGet.Protocol" Version="4.3.0-preview2-4095" />
     <Usage Id="NuGet.Protocol" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />
     <Usage Id="NuGet.Versioning" Version="4.0.0-rtm-2283" />
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     <Usage Id="NuGet.Versioning" Version="4.3.0" />
     <Usage Id="NuGet.Versioning" Version="4.7.0-rtm.5148+9245481f357ae542f92e6bc5e504fc898cfe5fc0" />