Make (or use) .NET Framework ref assemblies as a nuget package

[natemcmaster]

Reduce the number of external things that have to be installed in order to compile.
Also, it will reduce the things that are downloaded on Linux builds where .NET Framework isn't actually used.

[davidfowl]

Is this something we'd really want to own? There's an issue for this on corefx.

[natemcmaster]

This would be just for us. We've asked netfx to make these a few times, but after a few years of waiting, I think it's safe to say it's not coming.

[natemcmaster]

We may be able to punt this: dotnet/sdk#335

[Eilon]

Previous related issue: aspnet/KoreBuild#211

[natemcmaster]

Note to a potential future implementer: in linux, we acquire netfx assemblies with the "get-netfx.sh" script. If we move to nuget, that piece of the bootstrapper can be deleted.

[dasMulli]

What about the ones at https://dotnet.myget.org/feed/dotnet-core/package/nuget/Microsoft.TargetingPack.NETFramework.v4.5.2 ?

[natemcmaster]

That is one possibility. We're looking into it.

[natemcmaster]

Roslyn has some packages too that may provide this. https://github.com/dotnet/roslyn/blob/9a71fb677a8fa4bdab82ef9a49ae0358e1c9f578/build/Targets/Settings.props#L68

[hubuk]

@dasMulli
Microsoft.TargetingPack.NETFramework.v* packages lack some important directories described in this issue: https://github.com/dotnet/corefx/issues/25012
With this change they could be a replacement for https://aspnetcore.blob.core.windows.net/buildtools/netfx/4.6.1/netfx.4.6.1.tar.gz used currently.

[natemcmaster]

Good to know. Thanks for the heads up @hubuk .

[natemcmaster]

@tmat do you happen to know if roslyn's reference assembly nuget packages are (1) open source and (2) reference-able as a PackageReference?

[tmat]

@natemcmaster @jaredpar Builds the package from here: https://github.com/jaredpar/xcopy-msbuild/blob/master/build-reference-assemblies.ps1. The package is available in roslyn-tools feed:
https://dotnet.myget.org/feed/roslyn-tools/package/nuget/RoslynTools.ReferenceAssemblies