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new d7e1cc58 Add -Yfuture-lazy-vals for Scala 3.3.x builds (#546)
d7e1cc58 is described below
commit d7e1cc58b030be203256e87233d70ffa334b19ec
Author: He-Pin(kerr) <[email protected]>
AuthorDate: Sun Jun 14 19:16:33 2026 +0800
Add -Yfuture-lazy-vals for Scala 3.3.x builds (#546)
* feat: Add -Yfuture-lazy-vals for Scala 3.3.x builds
Motivation:
The Scala 3.3.8 compiler introduced the -Yfuture-lazy-vals flag to
optionally use VarHandle instead of sun.misc.Unsafe for lazy val
implementation. This prepares libraries for upcoming JDK releases
that restrict sun.misc.Unsafe access.
Modification:
Add -Yfuture-lazy-vals to scalacOptions, conditionally applied only
for Scala 3.3.x via CrossVersion.partialVersion or scalaBinaryVersion.
Result:
Scala 3.3.x build uses the future-proof VarHandle-based lazy val
implementation, compatible with all JDK 9+ versions including future
releases that restrict sun.misc.Unsafe.
References:
Refs scala/scala3-lts#637
Refs apache/pekko#3059
* fix: Add -release:17 required by -Yfuture-lazy-vals
The -Yfuture-lazy-vals flag requires explicit -java-output-version
set to minimum version 9 or higher. Add -release:17 to satisfy
this requirement for Scala 3.3.x builds.
---
project/ProjectSettings.scala | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/project/ProjectSettings.scala b/project/ProjectSettings.scala
index 6c20373b..37d8e38e 100644
--- a/project/ProjectSettings.scala
+++ b/project/ProjectSettings.scala
@@ -93,6 +93,10 @@ object ProjectSettings extends AutoPlugin {
if (insideCI.value && !Nightly && scalaVersion.value.startsWith("2."))
Seq("-Werror")
else Seq.empty
},
+ scalacOptions ++= {
+ if (scalaBinaryVersion.value == "3") Seq("-Yfuture-lazy-vals",
"-release:17")
+ else Seq.empty
+ },
Compile / doc / scalacOptions := scalacOptions.value ++ Seq(
"-Wconf:cat=scaladoc:i",
"-doc-title",
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