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Posted to notifications@pekko.apache.org by "He-Pin (via GitHub)" <gi...@apache.org> on 2026/06/13 08:44:07 UTC
[PR] Add -Yfuture-lazy-vals for Scala 3.3.x builds [pekko]
He-Pin opened a new pull request, #3059:
URL: https://github.com/apache/pekko/pull/3059
### Motivation
The Scala 3.3.8 compiler introduced the `-Yfuture-lazy-vals` flag ([scala/scala3-lts#637](https://github.com/scala/scala3-lts/pull/637)) 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 `DefaultScalacOptions` in `project/PekkoBuild.scala`, conditionally applied only for Scala 3.3.x via `CrossVersion.partialVersion`:
```scala
(CrossVersion.partialVersion(scalaVersion.value) match {
case Some((3, 3)) => Seq("-Yfuture-lazy-vals")
case _ => Nil
})
```
### Result
Pekko's 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`.
### Tests
- `sbt "++3.3.8; actor/compile"` — passed (exit 0, only pre-existing `@SerialVersionUID` and Java unchecked warnings)
### References
Refs scala/scala3-lts#637
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Re: [PR] Add -Yfuture-lazy-vals for Scala 3.3.x builds [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin merged PR #3059:
URL: https://github.com/apache/pekko/pull/3059
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Re: [PR] Add -Yfuture-lazy-vals for Scala 3.3.x builds [pekko]
Posted by "pjfanning (via GitHub)" <gi...@apache.org>.
pjfanning commented on code in PR #3059:
URL: https://github.com/apache/pekko/pull/3059#discussion_r3407922047
##########
project/PekkoBuild.scala:
##########
@@ -97,7 +97,11 @@ object PekkoBuild {
"-feature",
"-unchecked",
// 'blessed' since 2.13.1
- "-language:higherKinds")
+ "-language:higherKinds") ++
+ (CrossVersion.partialVersion(scalaVersion.value) match {
+ case Some((3, 3)) => Seq("-Yfuture-lazy-vals")
Review Comment:
we don't need this to be so complicated - just add it the Seq starting on line 94
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Re: [PR] Add -Yfuture-lazy-vals for Scala 3.3.x builds [pekko]
Posted by "He-Pin (via GitHub)" <gi...@apache.org>.
He-Pin commented on code in PR #3059:
URL: https://github.com/apache/pekko/pull/3059#discussion_r3408162841
##########
project/PekkoBuild.scala:
##########
@@ -97,7 +97,11 @@ object PekkoBuild {
"-feature",
"-unchecked",
// 'blessed' since 2.13.1
- "-language:higherKinds")
+ "-language:higherKinds") ++
+ (CrossVersion.partialVersion(scalaVersion.value) match {
+ case Some((3, 3)) => Seq("-Yfuture-lazy-vals")
Review Comment:
Yes! will do it.
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