I wonder what is the difference between the two here:
addCompilerPlugin("org.typelevel" %% "kind-projector" % "0.11.3" cross CrossVersion.full)
// if your project uses multiple Scala versions, use this for cross building
addCompilerPlugin("org.typelevel" % "kind-projector" % "0.11.3" cross CrossVersion.full)
My understanding was that cross CrossVersion.full
add the full Scala version to the library e.g.
kind-project_2.13.4:0.11.3
and that %%
adds the Scala Binary version e.g.
kind-project_2.13:0.11.3
Hence I do not understand why we need cross CrossVersion.full
with both %
and %%
. What's the difference?
I am pretty sure they are the same.
From Overriding the publishing convention:
crossVersion setting can override the publishing convention:
CrossVersion.disabled
(no suffix)CrossVersion.binary
(_)CrossVersion.full
(_)The default is either
CrossVersion.binary
orCrossVersion.diabled
depending on the value of crossPaths.
From More about using cross-built libraries:
These are equivalent:
"a" %% "b" % "1.0" ("a" % "b" % "1.0").cross(CrossVersion.binary)
So eventually all it matters is the value of crossVersion
.
In order to test the crossVersion
, I created a simple task in my build.sbt
:
lazy val getVersion = taskKey[Unit]("A simple task")
getVersion := {
List(dep1, dep2, dep3, dep4).foreach { d =>
val att = Seq(d.organization ,d.name ,d.revision ,d.configurations ,d.isChanging ,d.isTransitive ,d.isForce ,d.explicitArtifacts ,d.inclusions ,d.exclusions ,d.extraAttributes ,d.crossVersion ,d.branchName)
println(att)
}
}
lazy val dep1 = "org.typelevel" % "kind-projector" % "0.11.3" cross CrossVersion.full
lazy val dep2 = "org.typelevel" %% "kind-projector" % "0.11.3" cross CrossVersion.full
lazy val dep3 = "org.typelevel" % "kind-projector" % "0.11.3"
lazy val dep4 = "org.typelevel" %% "kind-projector" % "0.11.3"
The output of sbt getVersion
is:
List(org.typelevel, kind-projector, 0.11.3, None, false, true, false, Vector(), Vector(), Vector(), Map(), Full(, ), None)
List(org.typelevel, kind-projector, 0.11.3, None, false, true, false, Vector(), Vector(), Vector(), Map(), Full(, ), None)
List(org.typelevel, kind-projector, 0.11.3, None, false, true, false, Vector(), Vector(), Vector(), Map(), Disabled(), None)
List(org.typelevel, kind-projector, 0.11.3, None, false, true, false, Vector(), Vector(), Vector(), Map(), Binary(, ), None)
As we can see, all of the modules are equivalent, except for crossVersion
, which in both dep1
, and dep2
is Full(, )
. Unlike the two others which are Disabled()
and Binary(, )
.