cross building against multiple versions of some library in SBT

cross-build.sbt

name := s"my-artifact_lib${System.getProperty("cross.build.lib.version")}"

libraryDependencies += "com.some.group" % "some-artifact" % System.getProperty("cross.build.lib.version")

val changeVer = inputKey[Unit]("change system property cross.build.lib.version")

val buildAndPublish = taskKey[Unit]("your custom build task...")

changeVer := {
  import complete.DefaultParsers._
  val ver = (Space ~> NotSpace).parsed
  System.setProperty("cross.build.lib.version",ver)
}

buildAndPublish := println(name.value) //you might want to do some actual building here ;)

val crossBuildCommand = Command.command("crossBuild") { state =>
  val libVersions = Seq("1.0","1.23","3.14")
  (state /: libVersions) { case (currState,ver) =>
    s"changeVer $ver" :: reload :: buildAndPublish :: currState
  }
}

commands += crossBuildCommand