Cannot publish self-contained worker project referencing another

When trying to publish single file exe for worker projects get error runtime identifier is required, but it was!

This happens when referencing another core 3 console project.

$ dotnet publish -r linux-x64 -c Release --self-contained true
Microsoft (R) Build Engine version 16.3.0+0f4c62fea for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 102.79 ms for C:\Dev\magnet-filewatcher\src\watcher\watcher.csproj.
  Restore completed in 102.79 ms for C:\Dev\magnet-filewatcher\src\worker\worker.csproj.
C:\Program Files\dotnet\sdk\3.0.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(127,5): error NETSDK1031: It is not supported to build or publish a self-contained application without specifying a RuntimeIdentifier.  Please either specify a RuntimeIdentifier or set SelfContained to false. [C:\Dev\magnet-filewatcher\src\watcher\watcher.csproj]

Steps to reproduce

• Create new worker project with dotnet new worker
• Add reference to your another core 3.0 console project with dotnet add reference
• .NET Core SDK (3.0.100)
• Windows 10 X64 es).

[darkguy2008]

This is still happening in .NET 5. Any fixes? Specifying the RuntimeIdentifier in the .csproj file is NOT a solution because if you develop on Windows, then deploy for Linux, you’ll need to have two .csproj files for each OS, NOT GOOD.

[gimmi]

I had the same problem with NetCore 3.1

This was not working:

dotnet publish .\src\MyProj\MyProj.csproj `
  --configuration Release `
  --runtime win-x64 `
  --self-contained true

Fixed by removing --self-contained true (that is the default anyway)

dotnet publish .\src\MyProj\MyProj.csproj `
  --configuration Release `
  --runtime win-x64