Make native-image generation work with any Scala version (#13)

plugin/src/main/scala/sbtnativeimage/NativeImagePlugin.scala

@@ -17,6 +17,7 @@ import sbt._
 import sbt.plugins.JvmPlugin
 import sbt.complete.DefaultParsers._
 import java.nio.file.Paths
+import scala.util.Try
 
 object NativeImagePlugin extends AutoPlugin {
   override def requires = JvmPlugin
@@ -79,10 +80,7 @@ object NativeImagePlugin extends AutoPlugin {
     out.toFile
   }
   override lazy val projectSettings: Seq[Def.Setting[_]] = List(
-    libraryDependencies ++= {
-      if (scalaVersion.value.startsWith("2.11")) Nil
-      else List("org.scalameta" %% "svm-subs" % nativeImageVersion.value)
-    },
+    libraryDependencies += "org.scalameta" % "svm-subs" % "101.0.0",
     target.in(NativeImage) :=
       target.in(Compile).value / "native-image",
     target.in(NativeImageInternal) :=

plugin/src/sbt-test/sbt-native-image/cross-build/Prog.scala

@@ -0,0 +1,3 @@
+object Prog {
+  def main(args: Array[String]): Unit = println(List(1, 2, 3).toString)
+}

plugin/src/sbt-test/sbt-native-image/cross-build/build.sbt

@@ -0,0 +1,15 @@
+enablePlugins(NativeImagePlugin)
+nativeImageOptions += "--no-fallback"
+crossScalaVersions := List(
+  "2.11.10",
+  "2.12.10",
+  "2.12.12",
+  "2.13.1",
+  "2.13.3"
+)
+mainClass.in(Compile) := Some("Prog")
+TaskKey[Unit]("check") := {
+  val binary = nativeImage.value
+  val output = scala.sys.process.Process(List(binary.toString)).!!.trim
+  assert(output == "List(1, 2, 3)", s"obtained: $output")
+}

plugin/src/sbt-test/sbt-native-image/cross-build/example/src/main/scala/example/Hello2.scala

@@ -0,0 +1,15 @@
+package example
+
+import java.nio.file.Files
+import java.nio.file.Paths
+import java.nio.charset.StandardCharsets
+
+object Hello2 {
+  def main(args: Array[String]): Unit = {
+    val text = List(1, 2, 3).toString() + "\n"
+    Files.write(
+      Paths.get("hello2.obtained"),
+      text.getBytes(StandardCharsets.UTF_8)
+    )
+  }
+}

plugin/src/sbt-test/sbt-native-image/cross-build/project/build.properties

@@ -0,0 +1 @@
+sbt.version=1.3.13

plugin/src/sbt-test/sbt-native-image/cross-build/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("org.scalameta" % "sbt-native-image" % sys.props("plugin.version"))

plugin/src/sbt-test/sbt-native-image/cross-build/test

@@ -0,0 +1 @@
+> +check