Hello! I’m using the <kotlin-compile-testing> libr...

# ksp

[Guilherme Delgado]

Hello! I’m using the kotlin-compile-testing library by @Zac Sweers to test my Processor with Kotlin 2.1.0-RC and KSP2. However, I’m facing compilation issues related to the generated files. Although the files are correct, the compiler throws an Unresolved reference error for the following imports:

import androidx.compose.ui.window.ComposeUIViewController
import platform.UIKit.UIViewController

I’ve tried specifying the required .jar files and plugins containing these references using the classpaths and pluginClasspaths variables from KotlinCompilation, but the issue persists. Here’s the packages I’m referencing:
JARs:
• org.jetbrains.compose.runtime
• org.jetbrains.compose.ui
Gradle Plugins:
• org.jetbrains.compose
• org.jetbrains.kotlin.multiplatform
• org.jetbrains.kotlin.plugin.compose
I managed to resolve all other missing references, but these two remain problematic. Interestingly, if I don’t use useKsp2() and set the languageVersion to 1.9, the tests pass without any Unresolved reference issues.
Could you help me understand why this happens and how to fix it? Thanks!

[ralf]

Maybe a little far fetched, but could it be related to this: https://kotlinlang.slack.com/archives/C013BA8EQSE/p1729726539158869 I assume this happens to you on a Mac?

[Guilherme Delgado]

I’m using a mac but my output error is different:

Expected :OK
Actual   :COMPILATION_ERROR

Because of a few, ex: Unresolved reference 'ComposeUIViewController'.
I use this configuration:

return KotlinCompilation().apply {
    useKsp2()
    usesKsp2 = precursorTools.contains("ksp2")
    languageVersion = if (!usesKsp2) "1.9" else languageVersion
...
}

and if I comment useKsp2() it works. The references are found or they aren’t checked, I don’t know. 🤷‍♂️
I’m migrating from tschuchortdev/kotlin-compile-testing to ZacSweers/kotlin-compile-testing/issues because I could not use Kotlin 2.1.0 with tschuchortdev , and also I’m starting to realize tschuchortdev ’s didn’t offer the capability of testing with KSP2. I thought using ksp.useKSP2=true in the project’s root gradle.properties would be enough but guess not.
When running the apps it works correctly (both for 2.1.0-RC2 and 2.1.0-RC2-1.0.28, KSP1 or KSP2) . It only fails with KSP2 in Tests because of the references, the code is always generated correctly.

[Guilherme Delgado]

I’ve been doing some investigation and it seams that not using KSP2 would make kspWithCompilation = false .
So that’s why when using tschuchortdev/kotlin-compile-testing this was working (it wasn’t compiling).
I’ve tested using tschuchortdev with kspWithCompilation = true and also ZacSweers without useKsp2() with languageVersion = 1.9 and kspWithCompilation = true and both equally fail, as expected.

[Guilherme Delgado]

So in the end, I guess both libs are working as expected, I just have to understand how to add to the classpath both:

import androidx.compose.ui.window.ComposeUIViewController
import platform.UIKit.UIViewController

Which I believe they are inside .klib files 😕

[Guilherme Delgado]

File("~/.konan/kotlin-native-prebuilt-macos-aarch64-2.1.0-RC2/klib/platform/ios_simulator_arm64/org.jetbrains.kotlin.native.platform.UIKit/default/linkdata/package_platform.UIKit/04_UIKit.knm")

File("~/.gradle/caches/modules-2/files-2.1/org.jetbrains.compose.ui/ui-uikitsimarm64/1.7.1/6314e65b9b0f9dc7e0a5fdd70256def5ffb4377c/ui.klib!/default/linkdata/package_androidx.compose.ui.window/1_window.knm")

Can’t find a way to add them in the classpath 🤔

[Guilherme Delgado]

I tried adding the plugins and dependencies in the module’s build.gradle:

alias(libs.plugins.kotlin.compose)
alias(libs.plugins.kotlin.compose.compiler)
implementation(compose.runtime)
implementation(compose.ui)

but continues to fail 🤷‍♂️

[Guilherme Delgado]

Created:
https://github.com/ZacSweers/kotlin-compile-testing/issues/304
https://youtrack.jetbrains.com/issue/KT-73424/How-to-add-.klib-as-classpath-dependencies

[ralf]

The compile testing library runs on the JVM, it’s not a multiplatform project and therefore cannot reference code from other platforms. I think this may be the issue. Try to reference iOS code on Android, it doesn’t work.

[Guilherme Delgado]

That’s a good point

[Guilherme Delgado]

@ralf so I found a workaround 😅

private val dummySourceA = """
    package androidx.compose.ui.window

    import androidx.compose.runtime.Composable
    import platform.UIKit.UIViewController

    fun ComposeUIViewController(content: @Composable () -> Unit): UIViewController = UIViewController()
""".trimIndent()

private val dummySourceB = """
    package platform.UIKit
    open class UIViewController
""".trimIndent()

val compilation = prepareCompilation(kotlin("Screen.kt", code), kotlin("ComposeUIViewController.kt", dummySourceA), kotlin("UIViewController.kt", dummySourceB))

will compile.

So, I have 2 options until the library supports KMP, either comment

assertEquals(KotlinCompilation.ExitCode.OK, result.exitCode)

or use this dummy data 😅