FSharp assemblies are not reported as prebuilts yet get added to the prebuilts tarball

[MichaelSimons]

Looking at a recent CI build (internal Microsoft link), the following prebuilts are reported:

  /tarball/repos/Directory.Build.targets(811,5): warning : 7 new packages used not in baseline! See report at /tarball/artifacts/prebuilt-report/baseline-comparison.xml for more information. Package IDs are: [/tarball/repos/known-good.proj]
/tarball/repos/Directory.Build.targets(811,5): warning : Microsoft.AspNetCore.App.Ref.6.0.8 [/tarball/repos/known-good.proj]
/tarball/repos/Directory.Build.targets(811,5): warning : Microsoft.DotNet.Common.ItemTemplates.7.0.100-rc.1.22409.4 [/tarball/repos/known-good.proj]
/tarball/repos/Directory.Build.targets(811,5): warning : Microsoft.DotNet.Common.ProjectTemplates.7.0.7.0.100-rc.1.22409.4 [/tarball/repos/known-good.proj]
/tarball/repos/Directory.Build.targets(811,5): warning : Microsoft.NETCore.App.Host.linux-x64.6.0.8 [/tarball/repos/known-good.proj]
/tarball/repos/Directory.Build.targets(811,5): warning : Microsoft.NETCore.App.Ref.6.0.8 [/tarball/repos/known-good.proj]
/tarball/repos/Directory.Build.targets(811,5): warning : runtime.placeholder-rid.Microsoft.NETCore.Runtime.ObjWriter.1.0.0-alpha.1.22364.1 [/tarball/repos/known-good.proj]

If you look at the generated Private.SourceBuilt.Prebuilts.7.0.100.x64.tar.gz, you will find additional fsharp packages.

$ tar -tf artifacts/x64/Release/Private.SourceBuilt.Prebuilts.7.0.100.x64.tar.gz 
./
./FSharp.Compiler.Service.41.0.6-preview.22409.11.nupkg
./FSharp.Core.6.0.6-beta.22409.11.nupkg
./FSharp.Core.6.0.6.nupkg
./FSharp.Compiler.Service.41.0.6.nupkg
./microsoft.netcore.app.ref.6.0.8.nupkg
./microsoft.netcore.app.host.linux-x64.6.0.8.nupkg
./microsoft.aspnetcore.app.ref.6.0.8.nupkg
./runtime.linux-x64.microsoft.netcore.runtime.objwriter.1.0.0-alpha.1.22364.1.nupkg

Investigation should be done to see which is correct (either the report or the generated tarball) and then fix the other.

[crummel]

@KevinRansom I tested this offline and none of these F# packages are required to actually build the product. Any idea where I should start looking for why they're being restored?

[crummel]

These packages are still in the online prebuilts but now with a 7.0 version number, so this wasn't just a 6.0 -> 7.0 transition problem. The offline build also has the F# packages included in the prebuilt tarball but not the prebuilt report. I'm still looking into how exactly this is happening, but we know that we can build offline without the F# packages so it's not a prebuilt leakage.

[crummel]

Things that I tried:

• Rearranging the build order - we thought that this might be runtime using the F# packages before they were built.
• Patching all F# projects to net7.
• Patching all F# projects to <LangVersion>latest</LangVersion>.
• Patching F# projects with these packages in assets.json to the new versions (build failure).
• Fiddling with F# PVP properties - tried environment variables and command-line variables.