Backport add default scaladoc settings to scaladoc artifact publishing (#16776)

Author: szymon-rd

project/Build.scala

@@ -843,6 +843,7 @@ object Build {
       "-sourcepath", (Compile / sourceDirectories).value.map(_.getAbsolutePath).distinct.mkString(File.pathSeparator),
       "-Yexplicit-nulls",
     ),
+    (Compile / doc / scalacOptions) ++= ScaladocConfigs.DefaultGenerationSettings.value.settings
   )
 
   lazy val `scala3-library` = project.in(file("library")).asDottyLibrary(NonBootstrapped)
@@ -1892,8 +1893,7 @@ object ScaladocConfigs {
     )
   }
 
-  lazy val DefaultGenerationConfig = Def.task {
-    def distLocation = (dist / pack).value
+  lazy val DefaultGenerationSettings = Def.task {
     def projectVersion = version.value
     def socialLinks = SocialLinks(List(
       "github::https://github.com/lampepfl/dotty",
@@ -1934,6 +1934,11 @@ object ScaladocConfigs {
     )
   }
 
+  lazy val DefaultGenerationConfig = Def.task {
+    def distLocation = (dist / pack).value
+    DefaultGenerationSettings.value
+  }
+
   lazy val Scaladoc = Def.task {
     DefaultGenerationConfig.value
       .add(UseJavacp(true))

project/ScaladocGeneration.scala

@@ -141,6 +141,7 @@ object ScaladocGeneration {
     def remove[T <: Arg[_]: ClassTag]: GenerationConfig
     def withTargets(targets: Seq[String]): GenerationConfig
     def serialize: String
+    def settings: Seq[String]
   }
 
   object GenerationConfig {
@@ -173,6 +174,9 @@ object ScaladocGeneration {
          ++ targets
       ).mkString(" ")
 
+      override def settings: Seq[String] =
+        args.map(_.serialize) ++ targets
+
       private def argsWithout[T <: Arg[_]](
         implicit tag: ClassTag[T]
       ): (Option[T], Seq[Arg[_]]) = args.foldLeft[(Option[T], Seq[Arg[_]])]((None, Seq.empty)) {