Add SetRoslynToolPath property to control setting RoslynToolPath automatically Closes #55

Author: CZEMacLeod

src/MSBuild.SDK.SystemWeb.CommonFiles/Sdk/MSBuild.SDK.SystemWeb.Common.DefaultPackages.targets

@@ -9,7 +9,7 @@
 
   <!-- Include compilers unless ExcludeDefaultSDKPackages property is set -->
   <ItemGroup Condition="'$(ExcludeDefaultSDKPackages)'=='false'">
-    <PackageReference Include="Microsoft.Net.Compilers.Toolset" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.Net.Compilers.Toolset" PrivateAssets="All" GeneratePathProperty="true"/>
     <PackageReference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" />
   </ItemGroup>
 

src/MSBuild.SDK.SystemWeb/Sdk/MSBuild.SDK.SystemWeb.DefaultPackages.targets

@@ -1,3 +1,13 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="MSBuild.SDK.SystemWeb.Common.DefaultPackages.props"/>
+
+  <PropertyGroup>
+    <!-- SetRoslynToolPath is true by default unless an explicit RoslynToolPath is already set -->
+    <SetRoslynToolPath Condition="'$(RoslynToolPath)'!=''">false</SetRoslynToolPath>
+    <SetRoslynToolPath Condition="'$(SetRoslynToolPath)'==''">true</SetRoslynToolPath>
+    <!-- This uses the version of Roslyn in Microsoft.Net.Compilers.Toolset to be used in ASP Compilation -->
+    <!-- Unless SetRoslynToolPath is set to false -->
+    <!-- Addresses #55 -->
+    <RoslynToolPath Condition="'$(SetRoslynToolPath)'=='true'">$(PkgMicrosoft_Net_Compilers_Toolset)\tasks\net472</RoslynToolPath>
+  </PropertyGroup>
 </Project>