hey all, We are trying to override what version of the kotlin stdlib we are using, with `implementat...

# gradle

[Nathan Tamez]

hey all, We are trying to override what version of the kotlin stdlib we are using, with implementation("org.jetbrains.kotlin:kotlin-stdlib:1.7.21") in out common main and have this set in our kotlin.stdlib.default.dependency=false gradle.properties file but we still get this error /Users/ntamez/git/NatoNathan/math-kmp/build/.transforms/7d524b6b24a9d3827991c9c6de7b0371/transformed/out/jars/classes.jar!/META-INF/math-kmp_debug.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.7.1. we are using 1.9 kotlin plugin and have the languageVersion and apiVersion set to 1.7 via compilerOptions

[Nathan Tamez]

this is a sample project we made to test this

build.gradle.kts.kt

[Nathan Tamez]

settings.gradle.kts.kt

settings.gradle.kts.kt

[spand]

tasks.withType<KotlinJvmCompile>().configureEach {
    compilerOptions {
        apiVersion.set(KotlinVersion.KOTLIN_1_9)
        languageVersion.set(KotlinVersion.KOTLIN_1_9)
        progressiveMode.set(true)
    }
}

Not really an expert but this sticks out. Is this on purpose?

[Nathan Tamez]

yeah, that was, it’s a kmp project, and we wanted to use 1,9 stuff on iOS and JS but need to support older kotlin versions on android

[Nathan Tamez]

but simply setting implementation("org.jetbrains.kotlin:kotlin-stdlib:1.7.21") should force the use of the older stdlib according to the docs,

[Nathan Tamez]

If you declare a standard library dependency explicitly (for example, if you need a different version), the Kotlin Gradle plugin won’t override it or add a second standard library.

https://kotlinlang.org/docs/gradle-configure-project.html#dependency-on-the-standard-library

[mbonnin]

but simply setting implementation("org.jetbrains.kotlin:kotlin-stdlib:1.7.21") should force the use of the older stdlib according to the docs

This will depend on kotlin-stdlib:1.7.21 but your own classes will still contain 1.9 Kotlin metadata

[mbonnin]

Kotlin metadata are (amongst other things) annotations that allows the Kotlin compiler to understand the Kotlin constructs (extension functions, properties, etc...). They are embedded in your lib bytecode and you need a compiler that has version n-1 to understand metadata produced by n (on the JVM)

[Nathan Tamez]

thanks, this works

tasks.withType<KotlinJvmCompile>().configureEach {
    compilerOptions {
        apiVersion.set(KotlinVersion.KOTLIN_1_7)
        languageVersion.set(KotlinVersion.KOTLIN_1_7)
        progressiveMode.set(true)
    }
}

[Nathan Tamez]

only problem now i have uncommented the tests, I get this error /Users/ntamez/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-test-junit/1.9.0/f106f1676ea59098e42e209709064c6e45b2913e/kotlin-test-junit-1.9.0.jar!/META-INF/kotlin-test-junit.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.7.1.
do i need to explicitly version implementation(kotlin("test")) ?

[mbonnin]

Yes, if you don't set the version, it's using the same as the Kotlin Gradle Plugin

[Nathan Tamez]

cool, thanks