IsExternalInit not generated correctly in multitargeting projects

[Lordfirespeed]

Reproduction Steps

Make a project that targets netstandard2.1 and net8.0

<TargetFrameworks>netstandard2.1;net8.0</TargetFrameworks>

and add a record class to it with some members, or alternatively a class with required init properties.

Expected Behavior

IsExternalInits type should be included in the compiled assembly targeting netstandard2.1.

Actual Behavior

Compilation succeeds, but IsExternalInits type is not included in the compiled assembly targeting netstandard2.1.

System info

This section should contain useful info such as:

• PolySharp NuGet version 1.14..1
• Operating system version Pop!_OS (Ubuntu) 22.04
• .NET SDK version 8.0.100
• Runtime is Unity 2022.3.9f1 (implements net48 and netstandard2.1)

[AArnott]

IsExternalInit must be emitted all the time, for all frameworks. Even if the framework already declares it.
The explanation of why is here: manuelroemer/IsExternalInit#5

[Sergio0694]

"IsExternalInit must be emitted all the time, for all frameworks."

This is not accurate. PolySharp generates the correct [TypeForwardedTo] in that case, instead of the polyfill. Not generating the polyfill is only a binary breaking changes if you don't generate the correct forwards, but PolySharp does that, so that's fine.

"Compilation succeeds, but IsExternalInits type is not included in the compiled assembly targeting netstandard2.1."

@Lordfirespeed I need more info from your end. First, I can't repro this:

Second, how is your project even compiling at all, if you're saying the .NET Standard 2.1 target doesn't have that polyfill?

Are you sure you're not looking at the wrong place or perhaps it was just VS not showing all generated files correctly?

[AArnott]

@Sergio0694 You are quite right. Brilliant solution that I hadn't thought of so didn't check for. My apologies for spreading FUD.

[Sergio0694]

All good, no worries! Just wanted to make sure there were no misunderstandings! 😊