Project dependency is "not compatible" even when not a reference

[mhutch]

The attached example contains two projects, ConsoleApp1, which references net40, and netstandardlib, which references netstandard1.6. They are both in one solution, and ConsoleApp1 is set to depend on netstandardlib but not reference it.

If I build it in VS, the build succeeds.

If I build on commandline, it fails with the following error:

"C:\Users\Mikayla\Projects\netstandardlib\netstandardlib.sln" (default target) (1) ->
"C:\Users\Mikayla\Projects\netstandardlib\ConsoleApp1\ConsoleApp1.csproj.metaproj" (default target) (3) ->
"C:\Users\Mikayla\Projects\netstandardlib\ConsoleApp1\ConsoleApp1.csproj" (default target) (4) ->
"C:\Users\Mikayla\Projects\netstandardlib\netstandardlib\netstandardlib.csproj" (GetTargetFrameworkProperties target) (2:3) ->
(GetTargetFrameworkProperties target) ->
  C:\Program Files\dotnet\sdk\1.1.0\Sdks\Microsoft.NET.Sdk\build\Microsoft.NET.Sdk.Common.targets(73,5): error : Project 'C:\Users\Mikayla\Projects\netstandardlib\netstandardlib\netstandardlib.csproj' targe ts '.NETStandard,Version=v1.6'. It cannot be referenced by a project that targets '.NETFramework,Version=v4.0'. [C:\Users\Mikayla\Projects\netstandardlib\netstandardlib\netstandardlib.csproj]

VS2017 15.3 Preview 2. Can also repro if I install .NET Core SDK 2.0 preview 2.

netstandardlib.zip

[mhutch]

I was able to work around this with the following target in the netstandard project

<!-- workaround for https://github.com/Microsoft/msbuild/issues/2399 -->
<Target Name="WorkaroundMSBuildIssue2399" BeforeTargets="GetTargetFrameworkProperties">
  <PropertyGroup>
    <ReferringTargetFramework>$(TargetFramework)</ReferringTargetFramework>
  </PropertyGroup>
</Target>

[rainersigwald]

We've been tracking this in the Sdk repo, so I'm going to close this as a duplicate of dotnet/sdk#939.

Your workaround is really nice, so I copied it over there.