Dotnet build hangs at CoreCompile when specific NuGet package referenced

[Forgind]

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Issue moved from dotnet/sdk#45036

• Please respond to @fabianoliver.

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From @fabianoliver on Friday, November 22, 2024 10:10:28 AM

Describe the bug

When using SDK 9.0.100, building any project that references "ReactiveUI.SourceGenerations" version 1.1.31 hangs forever at the "CoreCompile" stage. Building the same project using SDK 8.0.100 works well.

Please feel free to close this issue if you reckon the package itself is at fault of course. I'm raising this here though as I would think that building this with a different SDK version "should" not be able to break the referenced package / source generator in any way?

To Reproduce

Build an empty project with the following csproj

<PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
</PropertyGroup>

<ItemGroup>
    <PackageReference Include="ReactiveUI.SourceGenerators" Version="1.1.31" PrivateAssets="all" />
</ItemGroup>

[Forgind]

I'm not 100% sure what's going on here, as I don't understand how adding a PackageReference could possibly make something hang, but I don't see how it's connected to the SDK, so since it's hanging in the CoreCompile stage, I'm tentatively moving it to roslyn for a first look.

[CyrusNajmabadi]

Presumably an SG is running and has an infinite loop or something (or just takes a really really long time). Best is to open this in a profiler or debugger and see what stacks it is in when it appears to not be making progress.

[Youssef1313]

That's very likely an issue on https://github.com/reactiveui/ReactiveUI.SourceGenerators

@fabianoliver I can't repro by simply adding the package reference to a blank console app.