Making progress in building my Scala projects, but I’ve got a unique setup that I’m not sure how to get working with Pants TL;DR: Is it possible to have a target depend on another target that uses a different

resolve

? I’m getting a

NoCompatibleResolve

error In sbt I have a project called

predef

that defines an object with the full package path

example.Predef

. Every other project then gets an additional scalac arg:

-Yimports:java.lang,scala,scala.Predef,example.Predef

This makes it so that everything defined in

example.Predef

is available without needing any imports I’m trying to mirror this in my Pants config. In

pants.toml

I have:

[jvm.resolves]
jvm-default = "3rdparty/jvm/deps.lock"
uses-predef = "3rdparty/jvm/deps.lock"

[scala.version_for_resolve]
jvm-default = "3.7.3"
uses-predef = "3.7.3"

[scalac]
args = ["-deprecation", "-encoding", "utf8"]

[scalac.args_for_resolve]
uses-predef = ["-Yimports:java.lang,scala,scala.Predef,example.Predef"]

In

3rdparty/jvm/BUILD

I have:

jvm_artifact(
  name = "jvm-default-org.scala-lang_scala3-library_3",
  group = "org.scala-lang",
  artifact = "scala3-library_3",
  version = "3.7.3",
  resolve = "jvm-default",
)

jvm_artifact(
  name = "uses-predef-org.scala-lang_scala3-library_3",
  # ...same group, artifact, and version as above...
  resolve = "uses-predef",
)

And in a target (

shared/src/main/scala/example/BUILD

) that should get the extra scalac arg I have:

scala_sources(
  resolve = "uses-predef",
  dependencies = ["predef/src/main/scala/example"],
)

When I run

pants check ::

I get this error:

NoCompatibleResolve: The selected targets did not have a resolve in common:

jvm-default:
  * 3rdparty/jvm:jvm-default-org.scala-lang_scala3-library_3
  * predef/src/main/scala/example/Predef.scala

uses-predef:
  * 3rdparty/jvm:uses-predef-org.scala-lang_scala3-library_3
  * shared/src/main/scala/example/Example.scala

Targets which will be merged onto the same classpath must share a resolve (from the [resolve](<https://www.pantsbuild.org/2.29/reference/targets/deploy_jar#resolve>) field).

To clarify, a "resolve" just means a lockfile. Why would you need two different resolves pointing to the same underlying lockfile, which looks like what you're trying to do?

That’s the only way I could see to have a separate set of scalac args. Is there a different way?

Ah, I see. Hmmm, that is a tricky one. The "args_for_resolve" mechanism abuses resolves to provide functionality that is not strictly dependent on them. And your use case is running afoul of this. Let me think about this one.

Sounds good, thanks for taking a look!

If you don't hear back in a couple of days, ping me here to remind me 🙂

No worries and will do 👍

Unfortunately I don't see a clean solution here. I'm assuming that adding

-Yimports:java.lang,scala,scala.Predef,example.Predef

when compiling Predef itself leads to error?

Yeah unfortunately it does

error: bad preamble import example.Predef

Yeah, I would expect it to