From 567988186cbe704255aefdc6bc970cff7d01be00 Mon Sep 17 00:00:00 2001
From: Anton Sviridov <keynmol@gmail.com>
Date: Wed, 18 Dec 2024 09:48:04 +0000
Subject: [PATCH] Cross-build sbt-metals for sbt2

---
 build.sbt       | 13 +++++++++++++
 project/V.scala |  1 +
 2 files changed, 14 insertions(+)

diff --git a/build.sbt b/build.sbt
index 8e922a8287a..f06322f9f6f 100644
--- a/build.sbt
+++ b/build.sbt
@@ -526,7 +526,20 @@ lazy val `sbt-metals` = project
       "lastSupportedSemanticdb" -> SemanticDbSupport.last,
     ),
     scalaVersion := V.scala212,
+    crossScalaVersions := Seq(V.scala212, V.scala3ForSBT2),
     scriptedLaunchOpts ++= Seq(s"-Dplugin.version=${version.value}"),
+    (pluginCrossBuild / sbtVersion) := {
+      scalaBinaryVersion.value match {
+        case "2.12" => "1.5.8"
+        case _ => "2.0.0-M3"
+      }
+    },
+    scalacOptions ++= {
+      scalaBinaryVersion.value match {
+        case "2.12" => "-Xsource:3" :: Nil
+        case _ => Nil
+      }
+    },
   )
   .settings(sharedScalacOptions)
   .enablePlugins(BuildInfoPlugin, SbtPlugin)
diff --git a/project/V.scala b/project/V.scala
index 41bd538236f..cb6f5a7e3ed 100644
--- a/project/V.scala
+++ b/project/V.scala
@@ -7,6 +7,7 @@ object V {
   val scala213 = "2.13.15"
   val lastPublishedScala3 = "3.3.3"
   val scala3 = "3.3.4"
+  val scala3ForSBT2 = "3.6.2"
 
   // When you can add to removedScalaVersions in MtagsResolver.scala with the last released version
   val sbtScala = "2.12.18"