How to set javac options?

[kubukoz]

In sbt (for example), one can compile their Scala to a specific version of JVM bytecode by specifying javacOptions:

javacOptions ++= Seq("-source", "8", "-target", "8")

I was unable to do that in scala-cli. I couldn't find docs on how to do it via directives, but found some about CLI parameters, so I tried:

scala-cli package .  -f --javac-option -source --javac-option 1.8 --javac-option -target --javac-option 1.8

with this app:

//> using scala "3.1.3"

object Main {
  def main(args: Array[String]) = args.zipWithIndex.foreach(println)
}

My JVM (Zulu openjdk11) didn't like this:

./Main

Unrecognized option: -source
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

What am I doing wrong? Is there a directive that'd allow me to pass all these flags inside the source file?

[lwronski]

@kubukoz
Thanks for reporting, it seems there is some regression in scala-cli, I created issue to fix this bug - #1326

If you use scala-cli 0.1.9 it should works:

scala-cli --cli-version 0.1.9 package .  -f --javac-option -source --javac-option 1.8 --javac-option -target --javac-option 1.8

[kubukoz]

How would you configure these options via directives?

[lwronski]

@kubukoz Sorry for the long answer, you can try to use javacOpt using the directive that was added in the last release of 0.1.16 - https://scala-cli.virtuslab.org/docs/commands/compile/#jvm-options.