Split jvm-specific settings into scalaModuleSettingsJVM

Move jvm-specific settings from scalaModuleSettings to a new
scalaModuleSettingsJVM setting. This means that JVM projects in
scala modules now have to add bot `scalaModuleSettings` and
`scalaModuleSettingsJVM`.

Adding sbt-osgi settings in a scala-js project caused the published
jar to be empty (scala/scala-parser-combinators#119).

build.sbt

@@ -24,10 +24,6 @@ bintrayRepository := "sbt-plugins"
 
 bintrayOrganization := None
 
-// this plugin depends on the sbt-osgi plugin -- 2-for-1!
-// TODO update to 0.8.0
-//      this might require us to modify the downstream project to enable the AutoPlugin
-//      See code changes and docs: https://github.com/sbt/sbt-osgi/commit/e3625e685b8d1784938ec66067d629251811a9d1
-addSbtPlugin("com.typesafe.sbt" % "sbt-osgi" % "0.7.0")
+addSbtPlugin("com.typesafe.sbt" % "sbt-osgi" % "0.9.1")
 
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.1.14")

src/main/scala/ScalaModulePlugin.scala

@@ -1,17 +1,17 @@
-import sbt._
-import Keys._
 import com.typesafe.sbt.osgi.{OsgiKeys, SbtOsgi}
-import com.typesafe.tools.mima.plugin.{MimaPlugin, MimaKeys}, MimaKeys._
+import com.typesafe.tools.mima.plugin.MimaKeys._
+import com.typesafe.tools.mima.plugin.MimaPlugin
+import sbt.Keys._
+import sbt.{Def, _}
 
 object ScalaModulePlugin extends AutoPlugin {
   val repoName            = settingKey[String]("The name of the repository under github.com/scala/.")
   val mimaPreviousVersion = settingKey[Option[String]]("The version of this module to compare against when running MiMa.")
   val scalaVersionsByJvm  = settingKey[Map[Int, List[(String, Boolean)]]]("For a Java major version (6, 8, 9), a list of a Scala version and a flag indicating whether to use this combination for publishing.")
 
-  // Settings applied to the entire build when the plugin is loaded.
-
   // See https://github.com/sbt/sbt/issues/2082
   override def requires = plugins.JvmPlugin
+
   override def trigger = allRequirements
 
   // Settings in here are implicitly `in ThisBuild`
@@ -54,11 +54,15 @@ object ScalaModulePlugin extends AutoPlugin {
   )
 
   /**
-   * Enable `-opt:l:classpath` or `-optimize`, depending on the scala version.
+   * Enable `-opt:l:inline`, `-opt:l:classpath` or `-optimize`, depending on the scala version.
    */
-  lazy val enableOptimizer: Setting[_] = scalacOptions in (Compile, compile) += {
-    val Some((2, maj)) = CrossVersion.partialVersion(scalaVersion.value)
-    if (maj >= 12) "-opt:l:classpath" else "-optimize"
+  lazy val enableOptimizer: Setting[_] = scalacOptions in (Compile, compile) ++= {
+    val v = scalaVersion.value
+    val Some((2, maj)) = CrossVersion.partialVersion(v)
+    if (maj >= 12) {
+      if (v.startsWith("2.12.3")) Seq("-opt:l:inline", "-opt-inline-from", "scala.**")
+      else Seq("-opt:l:classpath")
+    } else Seq("-optimize")
   }
 
   /**
@@ -78,8 +82,6 @@ object ScalaModulePlugin extends AutoPlugin {
   lazy val scalaModuleSettings: Seq[Setting[_]] = Seq(
     repoName := name.value,
 
-    mimaPreviousVersion := None,
-
     organization := "org.scala-lang.modules",
 
     // don't use for doc scope, scaladoc warnings are not to be reckoned with
@@ -140,6 +142,10 @@ object ScalaModulePlugin extends AutoPlugin {
         </developer>
       </developers>
     )
+  )
+
+  lazy val scalaModuleSettingsJVM: Seq[Setting[_]] = Seq(
+    mimaPreviousVersion := None
   ) ++ mimaSettings ++ scalaModuleOsgiSettings
 
   // adapted from https://github.com/typesafehub/migration-manager/blob/0.1.6/sbtplugin/src/main/scala/com/typesafe/tools/mima/plugin/SbtMima.scala#L69
@@ -200,7 +206,7 @@ object ScalaModulePlugin extends AutoPlugin {
   // a setting-transform to turn the regular version into something osgi can deal with
   private val osgiVersion = version(_.replace('-', '.'))
 
-  private lazy val scalaModuleOsgiSettings = SbtOsgi.osgiSettings ++ Seq(
+  private lazy val scalaModuleOsgiSettings = SbtOsgi.projectSettings ++ SbtOsgi.autoImport.osgiSettings ++ Seq(
     OsgiKeys.bundleSymbolicName  := s"${organization.value}.${name.value}",
     OsgiKeys.bundleVersion       := osgiVersion.value,