support scala-native Scala 3 build

Author: xuwei-k

.circleci/config.yml

@@ -157,3 +157,6 @@ workflows:
       - scalanative_job:
           name: native0.4_2.13
           scala_version: 2.13.8
+      - scalanative_job:
+          name: native0.4_3
+          scala_version: 3.1.0

build.sbt

@@ -140,26 +140,66 @@ lazy val xml = crossProject(JSPlatform, JVMPlatform, NativePlatform)
   )
   .jsEnablePlugins(ScalaJSJUnitPlugin)
   .nativeSettings(
-    crossScalaVersions := Seq("2.13.8", "2.12.15"),
+    crossScalaVersions := Seq("2.13.8", "2.12.15", "3.1.0"),
+    mimaPreviousArtifacts := {
+      // TODO remove this setting whien 2.0.2 released
+      if (scalaBinaryVersion.value == "3") {
+        mimaPreviousArtifacts.value.filterNot(_.revision == "2.0.1")
+      } else {
+        mimaPreviousArtifacts.value
+      }
+    },
     // Scala Native cannot run forked tests
     Test / fork := false,
-    libraryDependencies += "org.scala-native" %%% "junit-runtime" % nativeVersion % Test,
-    Test / scalacOptions += {
-      val log = streams.value.log
-      val retrieveDir = baseDirectory.value / "scala-native-junit-plugin-jars"
-      val lm = dependencyResolution.value
-      val cp = lm
-        .retrieve(
-          "org.scala-native" % s"junit-plugin_${scalaVersion.value}" % nativeVersion,
-          scalaModuleInfo = None,
-          retrieveDir,
-          log
-        )
-        .fold(w => throw w.resolveException, identity(_))
-      val jarPath = cp
-        .find(_.toString.contains("junit-plugin"))
-        .getOrElse(throw new Exception("Can't find Scala Native junit-plugin jar"))
-      s"-Xplugin:$jarPath"
+    Seq(Compile, Test).map { s =>
+      s / sources := {
+        CrossVersion.partialVersion(scalaVersion.value) match {
+          case Some((3, 0)) =>
+            Nil
+          case _ =>
+            (s / sources).value
+        }
+      }
+    },
+    libraryDependencies := {
+      CrossVersion.partialVersion(scalaVersion.value) match {
+        case Some((3, 0)) =>
+          // scala-native does not support Scala 3.0.x
+          Nil
+        case _ =>
+          libraryDependencies.value ++ Seq("org.scala-native" %%% "junit-runtime" % nativeVersion % Test)
+      }
+    },
+    Compile / doc / scalacOptions --= {
+      // TODO remove this workaround
+      // https://github.com/scala-native/scala-native/issues/2503
+      if (scalaBinaryVersion.value == "3") {
+        (Compile / doc / scalacOptions).value.filter(_.contains("-Xplugin"))
+      } else {
+        Nil
+      }
+    },
+    publish / skip := CrossVersion.partialVersion(scalaVersion.value) == Some((3, 0)),
+    Test / scalacOptions ++= {
+      if (CrossVersion.partialVersion(scalaVersion.value) != Some((3, 0))) {
+        val log = streams.value.log
+        val retrieveDir = baseDirectory.value / "scala-native-junit-plugin-jars"
+        val lm = dependencyResolution.value
+        val cp = lm
+          .retrieve(
+            "org.scala-native" % s"junit-plugin_${scalaVersion.value}" % nativeVersion,
+            scalaModuleInfo = None,
+            retrieveDir,
+            log
+          )
+          .fold(w => throw w.resolveException, identity(_))
+        val jarPath = cp
+          .find(_.toString.contains("junit-plugin"))
+          .getOrElse(throw new Exception("Can't find Scala Native junit-plugin jar"))
+        Seq(s"-Xplugin:$jarPath")
+      } else {
+        Nil
+      }
     },
     Test / testOptions += Tests.Argument(TestFrameworks.JUnit, "-a", "-s", "-v")
   )