Net5.0 RC2: When building a solution with a target runtime ID an error is given

[zontreck]

In previous versions of dotnet core, you could build a solution with the runtime flag -r and it would build for that target (ex. dotnet build -c Release -r win-x64. Now however with RC2 it appears to echo out the error:

error NETSDK1134: Building a solution with a specific RuntimeIdentifier is not supported. If you would like to publish for a single RID, specifiy the RID at the individual project level instead. 

If this is the new normal, is there a replacement method for cross-compiling an entire solution for multiple platforms?

[marcpopMSFT]

Here's the history on why we ended up blocking this: #863

Agree, the same issue with release build of .net 5

[norgie]

So how do we compile for e.g. both win10-x64 and linux-x64 in the same build process?

[svdHero]

Same question here. I need to compile a Solution for both Windows and Linux. How would I do that?

[svdHero]

Interestingly enough a
dotnet test MySolution.sln -c Release -r win-x64
works fine without any error. It also builds the whole solution with the specified runtime before executing all unit tests. How is that different from
dotnet build MySolution.sln -c Release -r win-x64??? 😕

Both should be possible.