AdditionalFiles do not show up in CompilationStartAnalysisContext.Options.AdditionalFiles

[torgabor]

Version Used:
Microsoft.CodeAnalysis.Analyzers version=1.1.0
others: 1.2.1
Steps to Reproduce:

1. Create example analyzer project, modify it to include a CompilationStartAction
2. Add text file to project, set its type to "AdditionalFiles"
3. The CompilationStartAnalysisContext' Options.AdditionalFiles array reports as empty.
   This is consistently reproducible between two installations.

I've tried following the instructions on adding additional files:
https://github.com/dotnet/roslyn/blob/master/docs/analyzers/Using%20Additional%20Files.md
I'm really thinking I'm missing something here, however the whole process seems pretty straightforward.
I can send an example project if it helps.
Expected Behavior:
Included text file appears in context.Options.AdditionalFiles
Actual Behavior:
context.Options.AdditionalFiles is empty

[Pilchie]

Also tagging @srivatsn - does this all seem right to you?

[srivatsn]

Ya the instructions in that doc should work. @torgabor, do you see the same behavior if you add some other item type to as well?

[torgabor]

Hi! I'm not sure what you mean by adding other item type.
I've tried specifying Contentin the AdditionalFileItemNames tag also(as described in the document), then setting the type of an item to Content. Same results, file does not show up.
Also, sorry, forgot to mention, I'm using Visual Studio 2015 Update 3

[jaybarden]

I've just encountered the same issue when running VS2017 15.7.1 for a .Net Standard project (using the https://github.com/dotnet/roslyn/blob/master/docs/analyzers/Using%20Additional%20Files.md example) so it still seems to be an issue :-(

[jasonmalinowski]

Hmm, @Pilchie any chance that's something to move to the project system for new stuff?

[Pilchie]

@jaybarden If you:

1. Start a Developer command prompt
2. Run set PROJECTSYSTEM_PROJECTOUTPUTPANEENABLED=1
3. Start VS from the command prompt with devenv
4. Open your solution

There should be an extra output window pane that logs what the project system passes to the language service. Can you share that, and we can see if the project system is telling Roslyn about the file?

[jaybarden]

ProjectOutputForTermsTesting.txt

Analyzer1.zip
@Pilchie - I've attached both the output and a zip of the solution I was using to try this out. Please let me know if you need anything else and many thanks for the speedy response!
Jay

[Pilchie]

Thanks - @jasonmalinowski in the log, I do see:

        Adding additional file 'C:\JB\Analyzer1\Analyzer1\Analyzer1\terms.txt'

So it looks like project system is passing this through to Roslyn.

[Pilchie]

Note however, that from this comment, I see that dotnet/project-system#2160 is still an issue.

[CyrusNajmabadi]

Closing out due to lack of feedback on this in 5+ years.