Bump to Scala 2.12.12 (#1847)

Also fix mill build to include new BuildInfo
Leave Scala 2.13.2 alone, there are problems when bumping

2 files changed, 20 insertions, 8 deletions

diff --git a/build.sbt b/build.sbt
index 1a0352b7..f329808a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -21,8 +21,8 @@ lazy val commonSettings = Seq(
   organization := "edu.berkeley.cs",
   name := "firrtl",
   version := "1.4-SNAPSHOT",
-  scalaVersion := "2.12.11",
-  crossScalaVersions := Seq("2.13.2", "2.12.11", "2.11.12"),
+  scalaVersion := "2.12.12",
+  crossScalaVersions := Seq("2.13.2", "2.12.12", "2.11.12"),
   addCompilerPlugin(scalafixSemanticdb),
   scalacOptions := Seq(
     "-deprecation",
diff --git a/build.sc b/build.sc
index 11bb5eff..78b03cea 100644
--- a/build.sc
+++ b/build.sc
@@ -3,17 +3,19 @@ import mill._
 import mill.scalalib._
 import mill.scalalib.publish._
 import mill.modules.Util
+import $ivy.`com.lihaoyi::mill-contrib-buildinfo:$MILL_VERSION`
+import mill.contrib.buildinfo.BuildInfo
 
-object firrtl extends mill.Cross[firrtlCrossModule]("2.11.12", "2.12.11")
+object firrtl extends mill.Cross[firrtlCrossModule]("2.11.12", "2.12.12")
 
-class firrtlCrossModule(crossVersion: String) extends ScalaModule with SbtModule with PublishModule {
+class firrtlCrossModule(crossVersion: String) extends ScalaModule with SbtModule with PublishModule with BuildInfo {
   // different scala version shares same sources
-  // mill use foo/2.11.12 foo/2.12.11 as millSourcePath by default
+  // mill use foo/2.11.12 foo/2.12.12 as millSourcePath by default
   override def millSourcePath = super.millSourcePath / os.up / os.up
 
   def scalaVersion = crossVersion
 
-  // 2.12.11 -> Array("2", "12", "10") -> "12" -> 12
+  // 2.12.12 -> Array("2", "12", "12") -> "12" -> 12
   private def majorVersion = crossVersion.split('.')(1).toInt
 
   def publishVersion = "1.4-SNAPSHOT"
@@ -66,14 +68,24 @@ class firrtlCrossModule(crossVersion: String) extends ScalaModule with SbtModule
     def testFrameworks = Seq("org.scalatest.tools.Framework")
 
     // a sbt-like testOnly command.
-    // for example, mill -i "firrtl[2.12.11].test.testOnly" "firrtlTests.AsyncResetSpec"
+    // for example, mill -i "firrtl[2.12.12].test.testOnly" "firrtlTests.AsyncResetSpec"
     def testOnly(args: String*) = T.command {
       super.runMain("org.scalatest.run", args: _*)
     }
   }
 
+  override def buildInfoPackageName = Some("firrtl")
+
+  override def buildInfoMembers: T[Map[String, String]] = T {
+    Map(
+      "buildInfoPackage" -> artifactName(),
+      "version" -> publishVersion(),
+      "scalaVersion" -> scalaVersion()
+    )
+  }
+
   override def generatedSources = T {
-    generatedAntlr4Source() ++ generatedProtoSources()
+    generatedAntlr4Source() ++ generatedProtoSources() :+ generatedBuildInfo()._2
   }
 
   /** antlr4 */