Scalac can't generate 55(jvm11) bytecode version

[chucheng92]

Reproduction steps

I try to use scalac compile (environment bounding jdk is jdk11) scala source code, but the generate bytecode version always be 52(jdk8). My scala version is 2.12.15. I notice that scalac help show target:

-target:<target> Target platform for object files. All JVM 1.5 - 1.7 targets are deprecated. (jvm-1.5,jvm-1.6,jvm-1.7,[jvm-1.8])

so, my question is scala-2.12 now whether didnot support generate jvm-11(55) or higher bytecode ? whether user must use 2.13 or higher version?

Problem

didnot support generate jvm-11 (55) or higher bytecode.

[som-snytt]

I don't know, I thought the getting started page had guidance on platform support, but now I can't find it again, so I'm just frustrated again with the docs.

The output of scalac -help is definitive.

There is a newer PR that says to prefer -release scala/scala#9982 which they will hopefully merge in 2.13.9. That says that if you're targeting platform N you probably also intend to target its API.

[SethTisue]

scala/scala#9916 and scala/scala#10000 will be released in Scala 2.12.16, which we may publish as soon as this week.

[SethTisue]

If you want to test this support now, you could try a nightly build: https://stackoverflow.com/questions/40622878/how-do-i-tell-sbt-or-scala-cli-to-use-a-nightly-build-of-scala-2-12-or-2-13

[chucheng92]

@SethTisue OK, Thanks.

[chucheng92]

@SethTisue Hi, the background is that apache flink community discuss upgrade their scala version to 2.12.x. I suggested 2.12.16 because 2.12.16 backport jvm11,jvm17 target jvm functionality, and the flink need this functionality. So i wonder what's the timeline of 2.12.16 released version? I have just noticed a v2.12.16 tag.

[SethTisue]

You can track progress at https://contributors.scala-lang.org/t/scala-2-12-16-release-planning/5692