Deprecate support for Scala 2.11 (#1551)

Leverages chiselRuntimeDeprecated infrastructure. As such it is not
currently suppressible.

2 files changed, 22 insertions, 6 deletions

diff --git a/build.sbt b/build.sbt
index 74406b2b..77ebe90b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -180,6 +180,12 @@ lazy val macros = (project in file("macros")).
 
 lazy val core = (project in file("core")).
   settings(commonSettings: _*).
+  enablePlugins(BuildInfoPlugin).
+  settings(
+    buildInfoPackage := "chisel3",
+    buildInfoUsePackageAsPath := true,
+    buildInfoKeys := Seq[BuildInfoKey](buildInfoPackage, version, scalaVersion, sbtVersion)
+  ).
   settings(publishSettings: _*).
   settings(
     name := "chisel3-core",
@@ -200,13 +206,7 @@ lazy val core = (project in file("core")).
 lazy val root = RootProject(file("."))
 
 lazy val chisel = (project in file(".")).
-  enablePlugins(BuildInfoPlugin).
   enablePlugins(ScalaUnidocPlugin).
-  settings(
-    buildInfoPackage := name.value,
-    buildInfoUsePackageAsPath := true,
-    buildInfoKeys := Seq[BuildInfoKey](buildInfoPackage, version, scalaVersion, sbtVersion)
-  ).
   settings(commonSettings: _*).
   settings(chiselSettings: _*).
   settings(publishSettings: _*).
diff --git a/core/src/main/scala/chisel3/internal/Builder.scala b/core/src/main/scala/chisel3/internal/Builder.scala
index d05a69f7..e55f1af7 100644
--- a/core/src/main/scala/chisel3/internal/Builder.scala
+++ b/core/src/main/scala/chisel3/internal/Builder.scala
@@ -603,8 +603,24 @@ private[chisel3] object Builder {
     throwException(m)
   }
 
+  def getScalaMajorVersion: Int = {
+    val "2" :: major :: _ :: Nil = chisel3.BuildInfo.scalaVersion.split("\\.").toList
+    major.toInt
+  }
+
+  def checkScalaVersion(): Unit = {
+    if (getScalaMajorVersion == 11) {
+      val url = _root_.firrtl.stage.transforms.CheckScalaVersion.migrationDocumentLink
+      val msg = s"Chisel 3.4 is the last version that will support Scala 2.11. " +
+                s"Please upgrade to Scala 2.12. See $url"
+      deprecated(msg, Some(""))
+    }
+  }
+
+
   def build[T <: RawModule](f: => T): (Circuit, T) = {
     dynamicContextVar.withValue(Some(new DynamicContext())) {
+      checkScalaVersion()
       errors.info("Elaborating design...")
       val mod = f
       mod.forceName(None, mod.name, globalNamespace)