enable new scala 3.4 feature -Ybackend-parallelism:16

scala/scala3#15392 before: ``` [success] Total time: 102 s (01:42), completed Mar 15, 2024, 8:03:47 AM ./lila 'clean;compile' 677.02s user 24.42s system 607% cpu 1:55.56 total ``` after: ``` [success] Total time: 99 s (01:39), completed Mar 15, 2024, 8:08:23 AM ./lila 'clean;compile' 652.09s user 23.96s system 628% cpu 1:47.53 total ```
lichess-org · Mar 15, 2024 · 7673668 · 7673668
1 parent 5c5ea4a
commit 7673668
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/project/BuildSettings.scala b/project/BuildSettings.scala
@@ -45,6 +45,7 @@ object BuildSettings {
       )
 
   val compilerOptions = Seq(
+    "-Ybackend-parallelism:16", // https://github.com/scala/scala3/pull/15392
     // "-nowarn", // during migration
     // "-rewrite",
     // "-source:3.4-migration",