Set an explicit version when registering compiler plugin

[3flex]

When the version isn't set the Kotlin Gradle plugin will attempt to resolve detekt-compiler-plugin using the version of the Kotlin Gradle plugin that is in use e.g. if Kotlin version is 1.4.31 the plugin will attempt to download detekt-compiler-plugin-1.4.31.pom from registered repositories.

[cortinico]

When the version isn't set

I'm missing why this could be the case. How can you not set the version?

[3flex]

The artifact coordinates returned by getPluginArtifact() are used here to create a dependency and put it on the Kotlin compiler plugin classpath:

https://github.com/JetBrains/kotlin/blob/v1.4.31/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/SubpluginEnvironment.kt#L69-L71

When the version isn't explicitly set the version used will be the version of the Kotlin Gradle plugin. I assume this is mostly to support other Kotlin plugins which default to the same version as declared by the Kotlin Gradle plugin itself and therefore don't need a version explicitly set.

I'm not sure why this issue wasn't exposed in previous testing but it might have something to do with the specific configuration of my build, though I didn't dig to find out.

[chao2zhang]

The actual culprit is on line 108 https://github.com/JetBrains/kotlin/blob/v1.4.31/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/SubpluginEnvironment.kt#L108