[.NET 10] missing Mono and Emscripten manifests for downlevel .NET 9 targeting

[jonathanpeppers]

Description

Looking here:

• https://dev.azure.com/dnceng/public/_artifacts/feed/dotnet10

We are missing packs like:

• Microsoft.NET.Workload.Mono.ToolChain.net9.Manifest-10.0.100-alpha.1
• Microsoft.NET.Workload.Emscripten.net9.Manifest-10.0.100-alpha.1

Note that we have the Current, net6, net7, and net8 manifest packs here.

Missing net9 manifests prevents us from building net9.0-* projects with a .NET 10 SDK, at:

• [main] Update dependencies from dotnet/sdk android#9395

This is blocking us from getting a build of .NET MAUI on .NET 10.

Reproduction Steps

dotnet workload install android --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10/nuget/v3/index.json with a .NET 10 SDK.

Expected behavior

These manifest packs exist on the dotnet10 feed:

• Microsoft.NET.Workload.Mono.ToolChain.net9.Manifest-10.0.100-alpha.1
• Microsoft.NET.Workload.Emscripten.net9.Manifest-10.0.100-alpha.1

Actual behavior

These manifest packs do not exist on the dotnet10 feed:

• Microsoft.NET.Workload.Mono.ToolChain.net9.Manifest-10.0.100-alpha.1
• Microsoft.NET.Workload.Emscripten.net9.Manifest-10.0.100-alpha.1

Regression?

Yes, .NET 10 should support building net9.0-* projects.

Known Workarounds

None

Configuration

• .NET SDK 10.0.100-alpha.1.24573.1
• .NET runtime 10.0.0-alpha.1.24570.9

Other information

No response

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[jonathanpeppers]

/cc @steveisok @lewing

[lewing]

yup, we're waiting for some sdk changes before adding it

[marcpopMSFT]

yup, we're waiting for some sdk changes before adding it

@lewing what changes are you still waiting on for this? I thought that all net10 changes I was tracking were in other than unwinding some test disablements.