[Question] How to create separate NuGet packages for OS specific native components

[conniey]

Details about Problem

I am trying to create a NuGet package that is a C# wrapper around ic4c. It has a set of native dlls that need to be compiled for each OS. I don't want to include it into a single NuGet package because the DLLs are 27MB for each OS. I noticed that the .NET team has NuGet packages like:
runtime.ubuntu.14.04-x64.runtime.native.system.io.compression that contain assets only for that OS.

Is there guidance on how to create those packages? I tried to find documentation on docs.microsoft.com and this repository but was unable to.

Thanks,
Connie

[jp2masa]

Maybe create a package that imports build targets, which add package references based on the RID?

[conniey]

@emgarten Could you point me in the right direction?

[rrelyea]

@kzu @ericstj - can one of you help us understand how to improve our docs for this?

[emgarten]

The current guidance is that packages should put all RID specific assemblies in the same package instead of splitting them up.

I don't believe there are docs on how to use runtime.json for this currently. There have been concerns raised about it being used out side of the System.* packages.

@ericstj @davidfowl should runtime.json be documented for splitting up packages?

[davidfowl]

The caveats need to be explained, but we should document it.

@conniey The downside is that the consumer of your package has to specify which RID they want to get assets for at restore time.