Intellij "cannot resolve symbol" errors

[kazutomo]

The "Cannot resolve symbol" error in IntelliJ when working with Chisel may be caused by IntelliJ’s default Scala error highlighting.

It does not look like this has been discussed here (apologies if this is overlapping).

You can fix it by changing the highlighting mode:

1. Open Settings
2. Go to Languages & Frameworks > Scala > Editor
3. Find Error highlighting
4. Change it from Built-in to Compiler

After switching to Compiler, the false errors should disappear.

I currently change this setting manually for each new project. Is there a way to make "Compiler" the default for all new projects?

[Emin017]

Which version of Chisel are you using? I think this might be similar to the issue we discussed earlier in #4929.

[kazutomo]

This is about Chisel 7.x. Thank you for pointing out! Yes, it is discussed in #4929.
Looks like you have already mentioned about "Error highlighting".

[jackkoenig]

What minor version are you using? It should be fixed if you're on Chisel 7.1.1 or newer

[kazutomo]

I'm using Chisel 7.9.0.

SyncReadMem's methods (e.g., read, write) are marked as 'cannot resolve symbol' if 'Error highlighting' is set to 'Built-in'.

[jackkoenig]

I'm guessing this is the same basic issue in IntelliJ that if you have $ in the name of traits, IntelliJ incorrectly ignores them in looking for public methods. Such a pain, but I think we can work around IntelliJ's bug by renaming the interface traits.

[jackkoenig]

This should be fixed by Chisel v7.11.0 (just released, artifacts should be available in a couple of hours).

For future similar issues, please file issues against IntelliJ itself (https://youtrack.jetbrains.com/issues/IDEA) as these are their bugs, not ours, and working around them takes non-trivial effort.