我有下面的sbt文件

lazy val root = (project in file(".")).
  settings(
    inThisBuild(List(
      sbtPlugin := true, 
      organization := "com.foo",
      crossScalaVersions := Seq("2.11.2", "2.12.0"),
      version      := "1.0.0"
    )),
    name := "myplugin",
    libraryDependencies ++= Seq(
      "org.scala-lang.modules" %% "scala-xml" % "1.0.6",
      "com.typesafe" % "config" % "1.3.3"
    )
  )

现在，我可以轻松地执行sbt publishLocal，并看到它在.ivy2/local/com.foo/myplugin/scala_2.12/sbt_1.0/1.0.0/jars/中生成了一个jar文件
但如果我

sbt +publishLocal

我得到一个错误

[error] Modules were resolved with conflicting cross-version suffixes in ProjectRef(uri("file:/Users/user/myplugin/"), "root"):
[error]    org.scala-lang.modules:scala-xml _2.11, _2.12
[error]    org.scala-lang.modules:scala-parser-combinators _2.11, _2.12
[error] java.lang.RuntimeException: Conflicting cross-version suffixes in: org.scala-lang.modules:scala-xml, org.scala-lang.modules:scala-parser-combinators
[error]         at scala.sys.package$.error(package.scala:27)
[error]         at sbt.librarymanagement.ConflictWarning$.processCrossVersioned(ConflictWarning.scala:39)
[error]         at sbt.librarymanagement.ConflictWarning$.apply(ConflictWarning.scala:19)
[error]         at sbt.Classpaths$.$anonfun$ivyBaseSettings$64(Defaults.scala:1995)
[error]         at scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error]         at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:39)
[error]         at sbt.std.Transform$$anon$4.work(System.scala:66)
[error]         at sbt.Execute.$anonfun$submit$2(Execute.scala:262)

我的期望是SBT会做两次编译和发布，每次它都会为正确的Scala版本选择正确的jar。
我的最终目标是让SBT发布多个jar文件，每个jar文件对应我的crossScalaVersions列表中的每个scala版本。