Hey everyone! I'm interested to learn how the Kotl...

# kontributors

[Pim]

Hey everyone! I'm interested to learn how the Kotlin compiler works and eventually in contributing to the project. Right now I'm trying to read and learn as much as possible. I have cloned the repo and followed the steps described in https://github.com/JetBrains/kotlin/tree/master#building. I run openjdk 17.0.9 and set kotlin.build.isObsoleteJdkOverrideEnabled=true in my local.properties.
I tried running one of the important gradle tasks as follow: ./gradlew -Porg.gradle.java.installations.auto-detect=false compilerTest this fails with reason:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':kotlin-stdlib-jdk8:compileModuleTestKotlin'.
> Inconsistent JVM-target compatibility detected for tasks 'compileModuleTestJava' (9) and 'compileModuleTestKotlin' (11).

I am not sure what's going wrong as I have not made any changes to the repo, and I followed the steps from the README. Could someone perhaps help me out?
Thanks!

[Pim]

Could it be that I need JDK6 of JDK7 because the task seems to hit kotlin-stdlib ?

[dmitriy.novozhilov]

Compilation of stdlib depends on jdk 8 and 9
Just run dist task without any additional gradle properties, and gradle automatically download all required jdks using toolchains

[dmitriy.novozhilov]

I also don't recommend to run compilerTest task as it will run for a very long time

Instead it's better to open the project in ide and run specific tests you are interested in

[Pim]

Thank you very much! I'll try to run the dist task and figure things out from within the IDE.

[Pim]

Hmm now something with the toolchain seems to fail when running: ./gradlew dist :

Invalid Java installation found at '/home/xxx/.gradle/jdks/zing20/zing20.09.1.0-1-jdk7.0.272-linux_x64' (provisioned toolchain). It will be re-checked in the next build. This might have performance impact if it keeps failing. Run the 'javaToolchains' task for more details.

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':kotlin-stdlib:compileMainJdk7KotlinJvm'.
> Unable to download toolchain matching the requirements ({languageVersion=7, vendor=any, implementation=vendor-specific}) from '<https://api.foojay.io/disco/v3.0/ids/45dfb704e8dcceab434285501d74cd33/redirect>'.
   > Provisioned toolchain '/home/xxx/.gradle/jdks/zing20/zing20.09.1.0-1-jdk7.0.272-linux_x64' could not be probed: Command returned unexpected result code: 139

I see that specific jdk downloaded to my ~/.gradle/jdks folder, but it's not extracted from the .tar.gz.

Also ran the javaToolchains task, this also shows no jdk7 installation found.

[Pim]

Given that toolchains are something provided by Gradle, would this be something to report/ask to Gradle?

[dmitriy.novozhilov]

Actually it's very strange, because kotlin.build.isObsoleteJdkOverrideEnabled=true should disable downloading of JDK 7 (together with JDK 6)
Where did you locate your local.properties file?
It should be in the root of the project, near gradle.properties

[Pim]

My bad @dmitriy.novozhilov. I removed my local.properties when I tried to run dist task. Because of https://kotlinlang.slack.com/archives/C0BUHC9HD/p1703191129233299?thread_ts=1703189917.604479&cid=C0BUHC9HD:

Just run dist task without any additional gradle properties

I thought you meant to also run without the local.properties . I will give it a try when putting back my properties file. Thanks again for the help, and happy holidays!