^compile does not resolve correct version of sbt plugin dependency (using addSbtPlugin)

steps

Given a build.sbt for an sbt plugin that needs to include another sbt plugin as a library dependency (e.g. we are creating an AutoPlugin which requires this other sbt plugin):

sbtPlugin := true

crossSbtVersions := Seq("0.13.16", "1.0.0-RC3")

addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.7.0")

problem

When attempting to cross-build (^compile) this plugin for the given versions of sbt, the resolution for the plugin used as a dependency fails:

> ^compile
[info] Setting `sbtVersion in pluginCrossBuild` to 0.13.16
[info] Set current project to sbt-issue (in build file:/Users/jeffo/Projects/jvm/sbt-issue/)
[success] Total time: 2 s, completed Jul 31, 2017 10:09:42 AM
[info] Setting `sbtVersion in pluginCrossBuild` to 1.0.0-RC3
[info] Set current project to sbt-issue (in build file:/Users/jeffo/Projects/jvm/sbt-issue/)
[info] Resolving com.eed3si9n#sbt-buildinfo;0.7.0 ...
[warn] 	module not found: com.eed3si9n#sbt-buildinfo;0.7.0
[logging elided] ...
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn] 	::          UNRESOLVED DEPENDENCIES         ::
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn] 	:: com.eed3si9n#sbt-buildinfo;0.7.0: not found
[warn] 	::::::::::::::::::::::::::::::::::::::::::::::
[warn] 
[warn] 	Note: Some unresolved dependencies have extra attributes.  Check that these dependencies exist with the requested attributes.
[warn] 		com.eed3si9n:sbt-buildinfo:0.7.0 (scalaVersion=2.12, sbtVersion=0.13)
[warn] 
[warn] 	Note: Unresolved dependencies path:
[warn] 		com.eed3si9n:sbt-buildinfo:0.7.0 (scalaVersion=2.12, sbtVersion=0.13) (/Users/jeffo/Projects/jvm/sbt-issue-1/build.sbt#L5-6)
[warn] 		  +- default:sbt-issue-1:0.1-SNAPSHOT (scalaVersion=2.12, sbtVersion=1.0)
[trace] Stack trace suppressed: run last *:update for the full output.
[error] (*:update) sbt.ResolveException: unresolved dependency: com.eed3si9n#sbt-buildinfo;0.7.0: not found

expectation

I would expect addSbtPlugin to use the correct version of Scala, conditionally, for each version of sbt that it is attempting to compile against.

notes

This can be worked around by replacing addSbtPlugin with the following:

libraryDependencies += {
  val currentSbtVersion = (sbtBinaryVersion in pluginCrossBuild).value
  Defaults.sbtPluginExtra("com.eed3si9n" % "sbt-buildinfo" % "0.7.0", currentSbtVersion, scalaBinaryVersion.value)
}

sbt version: 0.13.16, cross building for 0.13.16 and 1.0.0-RC3

[jroper]

For those too impatient to wait for a new release:

https://github.com/sbt/sbt-web-build-base/blob/9503fa2cb8cea57cdd859e140941514766a9aebd/src/main/scala/SbtWebBuildBase.scala#L16-L25

[eed3si9n]

Fix was merged to 0.13 branch - https://github.com/sbt/sbt/pull/3397 Still needs forward porting to 1.x branch