Cross build to sbt 2.0.0-M2

build.sbt

@@ -14,7 +14,11 @@ licenses += (
 
 homepage := Some(url("https://github.com/sbt/sbt-jdi-tools"))
 
-scalaVersion := "2.12.20"
+val scala212 = "2.12.20"
+val scala3 = "3.3.4"
+
+scalaVersion := scala212
+crossScalaVersions := Seq(scala212, scala3)
 pluginCrossBuild / sbtVersion := {
   scalaBinaryVersion.value match {
     case "2.12" =>
@@ -25,11 +29,11 @@ pluginCrossBuild / sbtVersion := {
 }
 
 scalacOptions ++= Seq(
-  "-encoding", "UTF-8", "-target:jvm-1.8",
+  "-encoding", "UTF-8",
   "-deprecation", "-unchecked", "-feature",
   "-Xfatal-warnings"
 ) ++ (CrossVersion.partialVersion(scalaVersion.value) match {
-  case Some((2, scalaMajor)) if scalaMajor == 10 => Seq("-Ywarn-all")
+  case Some((2, _)) => Seq("-target:jvm-1.8")
   case _ => Nil
 })
 

src/main/scala-2.12/org/scaladebugger/Compat.scala

@@ -0,0 +1,7 @@
+package org.scaladebugger
+
+import sbt._
+
+private[scaladebugger] object Compat {
+  def toClassEntry(file: File): Attributed[File] = Attributed.blank(file)
+}

src/main/scala-3/org/scaladebugger/Compat.scala

@@ -0,0 +1,8 @@
+package org.scaladebugger
+
+import sbt.*
+
+private[scaladebugger] object Compat:
+  inline def toClassEntry(file: File): Attributed[HashedVirtualFileRef] =
+    val fc = Keys.fileConverter.value
+    Attributed.blank(fc.toVirtualFile(file.toPath))

src/main/scala/org/scaladebugger/SbtJdiTools.scala

@@ -26,7 +26,7 @@ object SbtJdiTools extends AutoPlugin {
       Seq(
         // JDK Dependency (just for sbt, must exist on classpath for execution,
         // cannot be redistributed)
-        unmanagedJars += { Attributed.blank(JavaTools) }
+        unmanagedJars += Compat.toClassEntry(JavaTools)
       )
     else
       // on Java 9+, we don't need to do anything at all