#20356 Scalac fails when using plugins that emit additional compilation results Issue created by alonsodomin Describe the bug Some Scala compiler plugins emit additional compilation results from the typical output that comes out of

scalac

. Some of those plugins are

semanticdb

,

scalajs

,

scalanative

and others. The scenario workspace is as follows: `3rdparty/jvm/BUILD`:

jvm_artifact(
  name="scala-library",
  group="org.scala-lang",
  artifact="scala-library",
  version="2.13.12",
)

scala_artifact(
  name="semanticdb-jar",
  group="org.scalameta",
  artifact="semanticdb-scalac",
  version="4.8.15",
  crossversion="full"
)

scalac_plugin(
  name="semanticdb",
  artifact=":semanticdb-jar"
)

`pants.toml`:

[GLOBAL]
pants_version = "2.18.1"
backend_packages = [
  "pants.backend.experimental.scala",
]

[source]
root_patterns = [
  '/src/scala',
]

[jvm]
jdk = "temurin:1.11"
tool_jdk = "temurin:1.11"

[scala.version_for_resolve]
jvm-default = "2.13.12"

[scalac]
args = ["-Yrangepos"]

[scalac.plugins_for_resolve]
jvm-default = "semanticdb"

`src/scala/example/BUILD`:

scala_sources()

`src/scala/example/SimpleApp.scala`:

package example

object SimpleApp {
  def main(args: Array[String]) {
    println("Hello World")
  }
}

When running

pants check ::

the following error is shown:

2:34:01.06 [ERROR] Completed: pants.backend.scala.compile.scalac.compile_scala_source - src/scala/example/SimpleApp.scala failed (exit code 1).
error: src.scala.example.SimpleApp.scala.scalac.jar (Is a directory)
1 error

12:34:01.06 [ERROR] Completed: Check compilation for Scala - scalac - scalac failed (exit code 1).

Pants version 2.18.1 OS Both Additional info The error comes from the process running

scalac

as Pants expect it to output a JAR file but the additional output from the

scalac

plugin changes its behavior as it now produces a directory. pantsbuild/pants