Sdk: XML documentation isn't generated

[bradygaster-zz]

Steps to reproduce

1. Create a .NET project, and add /// comments throughout the code on any public member.
2. (If in VS) go to the project properties and check the XML Documentation File box.
3. (If building from command line) run dotnet build in the root of the project tree
4. Note that the XML documentation file isn't generated
   

   Expected behavior

Step 4 from above would generate the XML documentation file

Actual behavior

No documentation file exists

Environment data

Product Information:
Version: 1.0.0-preview2-003121
Commit SHA-1 hash: 1e9d529bc5

Runtime Environment:
OS Name: Windows
OS Version: 10.0.10586
OS Platform: Windows
RID: win10-x64

[livarcocc]

I am not sure what VS is doing for that, but in a project.json, if you specify

"buildOptions": {
    "xmlDoc": true
}

The xml file is generated correctly. Also, if you set

<GenerateDocumentationFile>true</GenerateDocumentationFile>
<DocumentationFile>$(OutputPath)\$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>

in your csproj, we will also generate the xml file.