printf problems with Chisel 7.0.0-RC3:

[oharboe]

I'm having problems with printf and Chisel 7.0.0-RC3:

<stdin>:249895:39: error: unknown printf substitution 'HierarchicalModuleName' (did you misspell it?)

    printf(cf"Multiplier $SimulationTime $HierarchicalModuleName ...\n")

Some silly thing I'm doing, surely?

SimulationTime works:

    printf(cf"Multiplier $SimulationTime ...\n")

[seldridge]

This is probably a firtool version issue. What version are you using?

firtool 1.111.0 supports only $SimulationTime. firtool 1.111.1 supports both.

With your bazel flow, you're choosing the Chisel and firtool versions separately, right? I have a bunch of CI/CD work in place that is guaranteeing that a given commit of Chisel will work with some version of firtool. This eventually gets enshrined in etc/circt.json once a new firtool is deployed. What you may want to do is to setup something which will, for the version of Chisel you are using, will check that you are using the same version of firtool that that version of Chisel was tested with.

[jackkoenig]

You can see which version of firtool Chisel was published against on the website: https://www.chisel-lang.org/docs/appendix/versioning (check Pre-releases to see 7.0.0-RC3).

There's also a neat way with scala-cli where you can depend on Chisel and run a little one liner that prints firtoolVersion from the included BuildInfo:

$ scala-cli run -S 2.13 --dep org.chipsalliance::chisel:7.0.0-RC3 -e 'println(chisel3.BuildInfo.firtoolVersion)'
Compiling project (Scala 2.13.16, JVM (21))
Compiled project (Scala 2.13.16, JVM (21))
Some(1.125.0)

[jackkoenig]

I have considered adding a main function to Chisel to just print the firtool version, then it would be even easier than that scala-cli one-liner to figure out the version programmatically.

[oharboe]

Twice in a row now :-) I need to think more about firtool. We need to upgrade to the latest, but we need to do some adaptations to our Bazel scripts, I think.