fixing issue #2

Author: Jinhuafei

src/Packages/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/build/Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props

@@ -4,19 +4,26 @@
       <Link>roslyn\%(RecursiveDir)%(Filename)%(Extension)</Link>
     </RoslyCompilerFiles>
   </ItemGroup>
-  <Target Name="IncludeRoslynCompilerFilesToItemGroup" AfterTargets="ResolveAssemblyReferences" >
+ <Target Name="RoslynCompilerFilesToPublish">
     <ItemGroup>
-      <None Include="@(RoslyCompilerFiles)" Condition="">
-        <Link>%(RoslyCompilerFiles.Link)</Link>
-        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-      </None>
+      <_RoslynFiles Include="@(RoslyCompilerFiles)" />
+      <FilesForPackagingFromProject Include="%(_RoslynFiles.Identity)">
+        <DestinationRelativePath>bin\roslyn\%(RecursiveDir)%(Filename)%(Extension)</DestinationRelativePath>
+      </FilesForPackagingFromProject>
     </ItemGroup>
   </Target>
+  <PropertyGroup>
+    <CopyAllFilesToSingleFolderForPackageDependsOn>
+      RoslynCompilerFilesToPublish;
+      $(CopyAllFilesToSingleFolderForPackageDependsOn);
+    </CopyAllFilesToSingleFolderForPackageDependsOn>
+  </PropertyGroup>
   <Target Name="CopyRoslynCompilerFilesToOutputDirectory" AfterTargets="CopyFilesToOutputDirectory">
-    <Copy SourceFiles="@(RoslyCompilerFiles)" DestinationFolder="$(OutDir)roslyn" ContinueOnError="true" SkipUnchangedFiles="true" />
+    <Copy SourceFiles="@(RoslyCompilerFiles)" DestinationFolder="$(WebProjectOutputDir)\bin\roslyn" ContinueOnError="true" SkipUnchangedFiles="true" Retries="0" />
   </Target>
-  <Target Name = "KillVBCSCompiler" BeforeTargets="_CopyOutOfDateSourceItemsToOutputDirectory">
-    <KillProcess ProcessName="VBCSCompiler" ImagePath="$(MSBuildProjectDirectory)" />
+  <Target Name = "KillVBCSCompilerAndRetryCopy" AfterTargets="CopyRoslynCompilerFilesToOutputDirectory" Condition="'$(MSBuildLastTaskResult)' == 'False'" >
+    <KillProcess ProcessName="VBCSCompiler" ImagePath="$(WebProjectOutputDir)" />
+    <Copy SourceFiles="@(RoslyCompilerFiles)" DestinationFolder="$(WebProjectOutputDir)\bin\roslyn" ContinueOnError="true" SkipUnchangedFiles="true" />
   </Target>
   <UsingTask TaskName="KillProcess" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
     <ParameterGroup>