-P:semanticdb:targetroot is not used

[eed3si9n]

steps

project/build.properties

sbt.version=1.2.3

project/plugins.scala

addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.8.0-RC1")

build.sbt

ThisBuild / organization := "com.example"
ThisBuild / version      := "0.1.0-SNAPSHOT"
ThisBuild / scalaVersion := "2.12.6"

// Scalafix plugin
ThisBuild / scalafixDependencies +=
  "com.eed3si9n.fix" %% "scalafix-noinfer" % "0.1.0-M1"

lazy val root = (project in file(".")).
  settings(
    name := "hello",
    addCompilerPlugin(scalafixSemanticdb),
    scalacOptions ++= List(
      "-Yrangepos",
      "-P:semanticdb:synthetics:on",
    ),
    Compile / scalacOptions += {
      val t = crossTarget.value / "meta"
      s"-P:semanticdb:targetroot:$t"
    },
  )

Main.scala

package example

case class Animal()

object Main extends App {
  List(Animal()).contains("1")
  Option(1) + "what"

}

> scalafix

problem

[error] SemanticDB not found: META-INF/semanticdb/Main.scala.semanticdb
[error] (Compile / scalafix) scalafix.sbt.ScalafixFailed: MissingSemanticdbError

expectation

I can move semanticdb out of classes directory, and still use Scalafix.

notes

https://github.com/scalacenter/scalafix/blob/v0.8.0-RC1/scalafix-core/src/main/scala/scalafix/v1/SemanticDocument.scala#L57-L58

[olafurpg]

Thanks for reporting! I agree Scalafix should respect -P:semanticdb:targetroot if it's defined. We already know scalacOptions so this should not be difficult to fix.

[olafurpg]

Pending fix in #882

[eed3si9n]

Nice. Thanks for the quick fix.