Rosyln.SDK missing from Visual Studio layout

Question

I'm creating an offline network installer for VS2019, combined with VS config export/import to mirror my VS install between two machines. I've selected specific workflows to reduce the layout from 50->15ish GB but when trying to install I get:

I cannot for the life of me see where this comes from.

• It is not listed in https://docs.microsoft.com/en-us/visualstudio/install/workload-component-id-vs-professional?view=vs-2019

• It is not included in my exported vsconfig file:

{ "version": "1.0", "components": [ "Microsoft.VisualStudio.Component.CoreEditor", "Microsoft.VisualStudio.Workload.CoreEditor", "Microsoft.NetCore.Component.Runtime.5.0", "Microsoft.NetCore.Component.Runtime.3.1", "Microsoft.NetCore.Component.SDK", "Microsoft.VisualStudio.Component.NuGet", "Microsoft.Net.Component.4.6.1.TargetingPack", "Microsoft.VisualStudio.Component.Roslyn.Compiler", "Microsoft.VisualStudio.Component.Roslyn.LanguageServices", "Microsoft.VisualStudio.Component.FSharp", "Microsoft.ComponentGroup.ClickOnce.Publish", "Microsoft.NetCore.Component.DevelopmentTools", "Microsoft.VisualStudio.Component.FSharp.WebTemplates", "Microsoft.VisualStudio.ComponentGroup.WebToolsExtensions", "Microsoft.VisualStudio.Component.DockerTools", "Microsoft.NetCore.Component.Web", "Microsoft.Net.Component.4.8.SDK", "Microsoft.Net.Component.4.7.2.TargetingPack", "Microsoft.Net.ComponentGroup.DevelopmentPrerequisites", "Microsoft.VisualStudio.Component.TypeScript.4.3", "Microsoft.VisualStudio.Component.JavaScript.TypeScript", "Microsoft.VisualStudio.Component.JavaScript.Diagnostics", "Microsoft.Component.MSBuild", "Microsoft.VisualStudio.Component.TextTemplating", "Component.Microsoft.VisualStudio.RazorExtension", "Microsoft.VisualStudio.Component.IISExpress", "Microsoft.VisualStudio.Component.SQL.ADAL", "Microsoft.VisualStudio.Component.SQL.LocalDB.Runtime", "Microsoft.VisualStudio.Component.Common.Azure.Tools", "Microsoft.VisualStudio.Component.SQL.CLR", "Microsoft.VisualStudio.Component.MSODBC.SQL", "Microsoft.VisualStudio.Component.MSSQL.CMDLnUtils", "Microsoft.VisualStudio.Component.ManagedDesktop.Core", "Microsoft.Net.Component.4.5.2.TargetingPack", "Microsoft.Net.Component.4.5.TargetingPack", "Microsoft.VisualStudio.Component.SQL.SSDT", "Microsoft.VisualStudio.Component.SQL.DataSources", "Component.Microsoft.Web.LibraryManager", "Component.Microsoft.WebTools.BrowserLink.WebLivePreview", "Microsoft.VisualStudio.ComponentGroup.Web", "Microsoft.VisualStudio.Component.Web", "Microsoft.Net.Component.4.TargetingPack", "Microsoft.Net.Component.4.5.1.TargetingPack", "Microsoft.Net.Component.4.6.TargetingPack", "Microsoft.Net.ComponentGroup.TargetingPacks.Common", "Component.Microsoft.VisualStudio.Web.AzureFunctions", "Microsoft.VisualStudio.ComponentGroup.AzureFunctions", "Microsoft.VisualStudio.Component.Azure.Compute.Emulator", "Microsoft.VisualStudio.Component.Azure.Storage.Emulator", "Microsoft.VisualStudio.Component.Azure.ClientLibs", "Microsoft.VisualStudio.Component.Azure.AuthoringTools", "Microsoft.VisualStudio.Component.CloudExplorer", "Microsoft.VisualStudio.ComponentGroup.Web.CloudTools", "Microsoft.VisualStudio.Component.DiagnosticTools", "Microsoft.VisualStudio.Component.EntityFramework", "Microsoft.VisualStudio.Component.AppInsights.Tools", "Microsoft.VisualStudio.Component.WebDeploy", "Microsoft.VisualStudio.Component.Debugger.JustInTime", "Component.Microsoft.VisualStudio.LiveShare", "Microsoft.VisualStudio.Component.WslDebugging", "Microsoft.VisualStudio.Component.IntelliCode", "Microsoft.Net.Core.Component.SDK.2.1", "Microsoft.Component.PythonTools", "Microsoft.VisualStudio.Component.VC.CoreIde", "Microsoft.VisualStudio.Component.Windows10SDK", "Microsoft.VisualStudio.Component.VC.Tools.x86.x64", "Microsoft.VisualStudio.Component.Graphics.Tools", "Microsoft.VisualStudio.Component.VC.DiagnosticTools", "Microsoft.VisualStudio.Component.Windows10SDK.19041", "Microsoft.ComponentGroup.PythonTools.NativeDevelopment", "Microsoft.Component.PythonTools.Miniconda", "Microsoft.Component.PythonTools.Web", "Component.CPython39.x64", "Microsoft.VisualStudio.Workload.Python", "Microsoft.VisualStudio.Component.Node.Tools", "Microsoft.VisualStudio.Workload.Node", "Microsoft.VisualStudio.Component.ManagedDesktop.Prerequisites", "Microsoft.ComponentGroup.Blend", "Microsoft.VisualStudio.ComponentGroup.MSIX.Packaging", "Microsoft.VisualStudio.Workload.ManagedDesktop", "Microsoft.VisualStudio.Component.VC.Redist.14.Latest", "Microsoft.VisualStudio.ComponentGroup.NativeDesktop.Core", "Microsoft.VisualStudio.ComponentGroup.WebToolsExtensions.CMake", "Microsoft.VisualStudio.Component.VC.CMake.Project", "Microsoft.VisualStudio.Component.VC.ATL", "Microsoft.VisualStudio.Component.VC.TestAdapterForBoostTest", "Microsoft.VisualStudio.Component.VC.TestAdapterForGoogleTest", "Microsoft.VisualStudio.Component.VC.ATLMFC", "Microsoft.VisualStudio.Component.VC.ASAN", "Microsoft.VisualStudio.Component.Windows10SDK.18362", "Microsoft.VisualStudio.Workload.NativeDesktop", "Microsoft.Component.NetFX.Native", "Microsoft.VisualStudio.ComponentGroup.UWP.NetCoreAndStandard", "Microsoft.VisualStudio.Component.Graphics", "Microsoft.VisualStudio.ComponentGroup.UWP.Xamarin", "Microsoft.VisualStudio.ComponentGroup.UWP.Support", "Microsoft.VisualStudio.Workload.Universal", "Microsoft.Component.CodeAnalysis.SDK", "Microsoft.VisualStudio.Workload.NetCoreTools", "Microsoft.VisualStudio.Component.Git", "Microsoft.NetCore.ComponentGroup.DevelopmentTools.2.1", "Microsoft.NetCore.ComponentGroup.Web.2.1" ] }

• I can see it exists in a full layout and doesn't in my custom layout but not which workflow it comes from. Or why it hasn't automatically been added, isn't this a core component?

• When I try to --add Roslyn.SDK to my layout using the VS installer I get the error Error: The package 'Roslyn.SDK' is not recognized.

So where does it come from and how can I get it in a custom layout? Can I even hack it into my layout somehow?

How can I find which workflow/component to add to get this included?

Answer 1

I eventually found that Rosyln.SDK is used by several workloads, as a non-documented dependency. Such as:

Visual Studio extension development ID: Microsoft.VisualStudio.Workload.VisualStudioExtension Description: Create add-ons and extensions for Visual Studio, including new commands, code analyzers and tool windows.

ADding this resolves the issues I have but leaves me thinking it should have been there already for C#/.Net development.