Ionide-vscode-fsharp: Project load failed - fsc.exe is missing

Created on 3 Mar 2021 · 11Comments · Source: ionide/ionide-vscode-fsharp

Describe the bug**

I updated to dotnet sdk 5.0.200 today and now when I open vscode, all my F# projects fail to load. If I then click on Project loading failed in the status bar, at the end I see this:

Using "Fsc" task from assembly "/usr/share/dotnet/sdk/5.0.200/FSharp/FSharp.Build.dll". Task "Fsc" The specified task executable location "/usr/share/dotnet/sdk/5.0.200/FSharp/fsc.exe" is invalid. Done executing task "Fsc" -- FAILED. Done building target "CoreCompile" in project "App.Client.fsproj" -- FAILED. Done building project "App.Client.fsproj" -- FAILED.

I checked and /usr/share/dotnet/sdk/5.0.200/FSharp/fsc.exe is missing from the directory.

Steps to reproduce

Open a workspace containing F# projects that contain:

<TargetFramework>net5.0</TargetFramework>

Link to sample reproduction

Expected behaviour

Projects should load successfully.

Screenshots

Machine info

OS: Pop!_OS 20.10
.NET SDK version: 5.0.200
Ionide version: 5.3.2

Additional context

Add any other context about the problem here.

Source

Bananas-Are-Yellow

👍1

Most helpful comment

A happy update: we believe that https://github.com/ionide/proj-info/pull/100 should fix this issue (and the _many_ other issues reported recently with the same root cause), and we'll be looking to incorporate that into FSAC and push an update of ionide soon.

baronfel on 3 Mar 2021

👍5

All 11 comments

Hey @Bananas-Are-Yellow :wave:,

Thank you for opening an issue. We will get back to you as
soon as we can. Also, check out our OpenCollective and consider
backing us.

https://opencollective.com/ionide

PS.: We offer backer support for all backers. Don't forget to add backer label when you start backing us :smile:

open-collective-bot[bot] on 3 Mar 2021

came here to say the same thing. Seems like between 5.0.103 and 5.0.200 it was renamed from fsc.exe to fsc.dll:

$ ls /usr/local/share/dotnet/sdk/5.0.103/FSharp/
cs        default.win32manifest                     Microsoft.Build.Utilities.Core.dll
de        fsc.deps.json                             Microsoft.DotNet.DependencyManager.dll
es        fsc.exe                                   Microsoft.FSharp.NetSdk.props
fr        fsc.runtimeconfig.json                    Microsoft.FSharp.NetSdk.targets
it        FSharp.Build.dll                          Microsoft.FSharp.Overrides.NetSdk.targets
ja        FSharp.Compiler.Interactive.Settings.dll  Microsoft.FSharp.Targets
ko        FSharp.Compiler.Private.dll               Microsoft.Portable.FSharp.Targets
pl        FSharp.Core.dll                           Microsoft.Win32.SystemEvents.dll
pt-BR     FSharp.DependencyManager.Nuget.dll        System.CodeDom.dll
ru        fsi.deps.json                             System.Drawing.Common.dll
runtimes  fsi.exe                                   System.Resources.Extensions.dll
tr        fsi.runtimeconfig.json                    System.Security.Permissions.dll
zh-Hans   Microsoft.Build.Framework.dll             System.Windows.Extensions.dll
zh-Hant   Microsoft.Build.Tasks.Core.dll

$ ls /usr/local/share/dotnet/sdk/5.0.200/FSharp/
cs        default.win32manifest                     Microsoft.Build.Tasks.Core.dll
de        fsc.deps.json                             Microsoft.Build.Utilities.Core.dll
es        fsc.dll                                   Microsoft.DotNet.DependencyManager.dll
fr        fsc.runtimeconfig.json                    Microsoft.FSharp.NetSdk.props
it        FSharp.Build.dll                          Microsoft.FSharp.NetSdk.targets
ja        FSharp.Compiler.Interactive.Settings.dll  Microsoft.FSharp.Overrides.NetSdk.targets
ko        FSharp.Compiler.Private.dll               Microsoft.FSharp.Targets
pl        FSharp.Core.dll                           Microsoft.Portable.FSharp.Targets
pt-BR     FSharp.Core.xml                           Microsoft.Win32.SystemEvents.dll
ru        FSharp.DependencyManager.Nuget.dll        System.CodeDom.dll
runtimes  fsi.deps.json                             System.Drawing.Common.dll
tr        fsi.dll                                   System.Resources.Extensions.dll
zh-Hans   fsi.runtimeconfig.json                    System.Security.Permissions.dll
zh-Hant   Microsoft.Build.Framework.dll             System.Windows.Extensions.dl

2mol on 3 Mar 2021

👍1

It seems that this change breaks our project-cracking (the first step in typechecking) which is provided by #ionide/proj-info, where we already are tracking this issue, just with less of an idea of what the root cause was.

baronfel on 3 Mar 2021

As a temporary workaround I downgraded dotnet using

apt install dotnet-sdk-5.0=5.0.103-1

pkese on 3 Mar 2021

❤2

From chat with @baronfel, some possibilities:

Calling msbuild's design-time build APIs with a minimal set of targets may be wrong here now
There may be something wrong in the F# targets

Will need to track down the cause of moving to fsc.dll instead of fsc.exe, but the same layout is also present in .NET 6 preview SDK, so my suspicion is there was some work in the SDK to move stuff around and "unify" across trains. I'm not aware of any intentional factoring on the F# side to move to fsc.dll, but I could also be wrong

cartermp on 3 Mar 2021

Should/can Ionide fall-back to fsc.dll when fsc.exe is not available, or is this to be left to upstream to resolve?

Is there an estimate of how long will it take to fix upstream?
In the meanwhile Ionide is broken and people will be complaining here.

pkese on 3 Mar 2021

We're actively working this, in the meantime I can only suggest staying on 5.0.1xx. Please note that this is a free product so you should manage your support expectations accordingly.

baronfel on 3 Mar 2021