updating to the new MPP plugin/Kotlin 1.4.21 is su...

# multiplatform

[robstoll]

updating to the new MPP plugin/Kotlin 1.4.21 is such a pain point, I really hoped it would be smoother 😞 I hope someone can answer me the following questions
1. ✔️ Is it considered normal that a gr build which fails due to failing test succeeds when I re-run it (without changing anything) -> jvmTest is skipped as it is up-to-date (allTest is executed but does nothing besides generating a html report). How can I change this behaviour? => seems like it: https://blog.gradle.org/stop-rerunning-tests
2. ✔️How can I disable the Please initialize at least one Kotlin target in... check? It was not there in 1.3.72 but is in 1.4.21. I have a root project which does not contain any source but several MPP sub-projects
3. ✔️ After the update to 1.4.21 I cannot longer run tests (via gradle), I get The root cause java.lang.UnsupportedOperationException was thrown at: org.jetbrains.kotlin.load.kotlin.TypeSignatureMappingKt.mapType(typeSignatureMapping.kt:99) during compileTestKotlinJvm is this a known problem?
4. ✔️ not really a problem as there is an easy workaround but out of curiosity why do js targets need the extra definition of the dependency to kotlin-stdlib-js?

[ilya.gorbunov]

2. Do you apply kotlin-multiplatform plugin to the root project?
3. Looks similar to https://youtrack.jetbrains.com/issue/KT-43802. Is it your case?
4. Shouldn't be needed in 1.4.x (since 1.4.0) because stdlib dependency is added by default.

[robstoll]

2. yes, I am in a setup where almost all code of the sub-project is of a generative nature, therefore I would like to configure it in the root via subprojects{ ... }
3. Looks like the same problem
4. good to know, thanks

[ilya.gorbunov]

2. Try to declare the plugin dependency, but do not apply it in the root project:
kotlin("multiplatform") version ... apply false

[robstoll]

not ideal as I cannot longer use Kotlin in this case but need to fallback to the untyped api

[robstoll]

for now (as workaround) I declare jvm() as target and will disable all tasks involved with it

[ilya.gorbunov]

You can use

the<org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension>().apply {
    ...
}

instead of kotlin { } in the subprojects { } block.

[robstoll]

perfect, thanks