[source-build] Bootstrapping the F# compiler fails with a "no entrypoint" warning

[crummel]

In the complete source-built SDK, our Linux partners will follow this procedure:

1. Source-build the SDK using the Microsoft-built SDK, producing the "stage 1 SDK".
2. Source-build the SDK again using the stage 1 SDK, producing the "stage 2 SDK", which is completely free of prebuilts and was not built using any prebuilt binaries.

In this process, we are seeing an issue in F#. The stage 1 SDK is produced as normal, but when attempting to compile the stage 2 SDK, the F# Proto build fails with warning: no entrypoint specified in executable binary. This warning was removed temporarily in dotnet/installer#14564 and dotnet/installer#14565.

[vzarytovskii]

@crummel what would be the easiest way of reproducing it? We also build Proto compiler with rc1 and then build product with Proto, and don't have this issue.

[crummel]

This was fixed by #13963, thanks!

[MichaelSimons]

What is the recommended solution for source-build in .NET 7.0? @KevinRansom

[vzarytovskii]

What is the recommended solution for source-build in .NET 7.0? @KevinRansom

If it's not fixed by the #13963, then it's fine to suppress it (or have a patch in place). It's only affecting (some of the) ref assemblies, so shouldn't be affecting the product, since we aren't shipping refassemblies.

[MichaelSimons]

Is #13963 going to flow into .NET 7.0?

[vzarytovskii]

Is #13963 going to flow into .NET 7.0?

Yes, iirc, it is a part of dotnet/sdk#28137 insertion and should be a part of rc2.