Is there a current guide to creating a Kotlin native library with gradle anywhere? https://kotlinlang.org/docs/reference/native/gradle_plugin.html makes reference to things like:

components.main {
    // Compile the component into an executable and a Kotlin/Native library.
    outputKinds = [EXECUTABLE, KLIBRARY]
}

Which we all know doesn't work,

components.main

is completely invalid syntax. I tried creating an empty Kotlin/Native library using Intellij's new project wizard did not add anything like

outputKinds = KLIBRARY

.

I would like to read/write to a text file in windows. How do I do that?

Here are some good questions for today: 1. Are C Libraries targeting ARM11 ( https://en.wikipedia.org/wiki/ARM11 ) compatible with Kotlin Native? 2. If the C libraries are compatible would they work with the linuxArm32Hfp (ARMv7), and linuxArm64 (ARMv8) targets? This is the C library I intend to use in a prototype type project: https://github.com/eclipse/paho.mqtt.c

Will 1.4.20 be tagged in the Kotlin/Native GitHub repository?

What does "Uncaught Kotlin exception: kotlin.IllegalStateException: Illegal transfer state" in the context of using concurrency workers mean and how do I avoid it?

Can anyone make sense of this

Event

class? https://github.com/JetBrains/kotlin-native/blob/master/samples/weather_function/function/src/main/kotlin/org/example/weather_func/events.kt ? I'm trying to understand how the libcurl examples from the Kotlin native samples code work. It only seems to work for short HTTP responses; when libcurl starts chunking larger responses I lose most of it.

After updating the KMQTT Client library ( https://gitlab.com/napperley/kmqtt-client ) to use Kotlin 1.4.0 the callback handling breaks. What changes were made to CFunction in Kotlin 1.4.0?

Hello! I'm playing with SQLDelight + Kotlin Multiplatform + iOS, and trying to create a test in-memory database for unit tests. I'm using the following code:

TodoDatabase(
        NativeSqliteDriver(
            DatabaseConfiguration(
                name = "",
                version = 1,
                create = { wrapConnection(it, TodoDatabase.Schema::create) },
                inMemory = true
            )
        )
    )

I added some logs and it seems that it actually executes Schema.create. However all queries to this database in tests are failing with errors like

no such table

. Also I see the following message in the logs: Invalid connection:

com.apple.coresymbolicationd

. Not sure if it is related actually. Could somebody give me some advice?

I have updated my intellij to 2020.2.4. My Kotlin plugin is updated too. I am using Kotlin 1.4.20. I'm trying to create a new multiplatform library. But everytime I try to create an "actual" implementation of an "expected" class, I get this this error: - Cannot perform operation. Too complex, sorry. Anyone had this issue also?

More questions about SQLDelight + iOS from my side 🙂 1. I am creating a new in-memory database instance for every test case. But on iOS it may contain data from previous test cases. On Android it is always clean. Is it expected behaviour? 2. Looks like last_insert_rowid() does not work on iOS, but works on Android. Is it just not implemented yet?

In a callback a kotlin.native.IncorrectDereferenceException is thrown after fetching a Stable Reference. Below is the stack trace:

Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException: illegal attempt to access non-shared org.digieng.kmqtt.client.MqttClient@add4d8 from other thread
    at kfun:kotlin.Throwable#<init>(kotlin.String?){} (0x2a7e09)
    at kfun:kotlin.Exception#<init>(kotlin.String?){} (0x2a1a07)
    at kfun:kotlin.RuntimeException#<init>(kotlin.String?){} (0x2a1bb7)
    at kfun:kotlin.native.IncorrectDereferenceException#<init>(kotlin.String){} (0x2cb1c7)
    at ThrowIllegalObjectSharingException (0x2cd977)
    at  (0x3e4acb)
    at _ZNK16KRefSharedHolder3refIL11ErrorPolicy2EEEP9ObjHeaderv (0x3e48f3)
    at Kotlin_Interop_derefStablePointer (0x3e488e)
    at kfun:kotlinx.cinterop.StableRef#get(){}1:0 (0x2692e6)
    at kfun:org.digieng.kmqtt.client.onDeliveryComplete#internal (0x37522e)
    at _6f72672e64696769656e673a6b6d7174742d636c69656e74_knbridge46 (0x37602b)
    at MQTTClient_cycle (0x410d46)
    at MQTTClient_run (0x40c4dd)
    at  (0x7f7a508b56db)
    at clone (0x7f7a503c6a3f)
    at  ((nil))
Aborted (core dumped)

What is the way to resolve this issue? Note that the Linux platform is used as the target, which does allow for multi-threading. However the synchronous version of the Paho MQTT library is used which is single threaded.

Creating a mutable variable in a singleton results in the following warning:

object MySingleton {
    private var testingVar = false
}

Variable in singleton without @ThreadLocal can't be changed after initialization.

On annotating with @ThreadLocal results in error:

@ThreadLocal is applicable only to top level declarations

I had been a bit frustrated with the lack of proper date/time support in Kotlin/Native, especially for my chosen platform,

linuxArm32Hfp

for the Raspberry Pi. So I checked out the kotlinx-datetime code, and took a look - perhaps I could make it work? After all, what's the different between

linuxX64

and

linuxArm32Hfp

- both are POSIX, both are likely to include the same core libraries. It turns out, there isn't a difference - I took kotlinx-datetime, added a single line to

build.gradle.kts

- I added

target("linuxArm32Hfp")

, compiled, deployed to maven local, and it worked. I was able to use kotlinx-datetime in my Raspberry Pi code just fine. I haven't fully tested it, but for my simple use case, it seems to be working just fine. So I'm beginning to wonder, what other Kotlin/Native libraries will 'just work' on "unsupported" platforms with just a small change to the build configuration?

message has been deleted

Intellij is unable to resolve any of the references for classes that come from cinterop. All of the code is in

iosMain

source set. This used to work correctly but has not for awhile. I've tried invalidating my cache, doing a full build, but the warnings will not go away. I'm using 2020.3 community edition. Kotlin plugin 203-1.4.10-relase-IJ5981.133 Kotlin 1.4.10 Is this a known problem or just something broken with me

I'm trying to work with Kotlin Native, Kotlin Multiplatform, and KMM, on Apple Silicon...anyone else here got that working?

under a native JVM (Azul Systems) it complains about compatible dylibs, I'm guessing it's downloading the x64 ones or can't differentiat between processors with macOS?

Seems as though the issue I am running into is a severe bug with Kotlin Native's memory model when Kotlin Coroutines are used, and C callbacks are involved. Below is the stack trace:

Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException: illegal attempt to access non-shared org.digieng.kmqtt.client.MqttClient@66c4d8 from other thread
    at kfun:kotlin.Throwable#<init>(kotlin.String?){} (0x2a7e09)
    at kfun:kotlin.Exception#<init>(kotlin.String?){} (0x2a1a07)
    at kfun:kotlin.RuntimeException#<init>(kotlin.String?){} (0x2a1bb7)
    at kfun:kotlin.native.IncorrectDereferenceException#<init>(kotlin.String){} (0x2cb1c7)
    at ThrowIllegalObjectSharingException (0x2cd977)
    at  (0x3e4b1b)
    at _ZNK16KRefSharedHolder3refIL11ErrorPolicy2EEEP9ObjHeaderv (0x3e4943)
    at Kotlin_Interop_derefStablePointer (0x3e48de)
    at kfun:kotlinx.cinterop.StableRef#get(){}1:0 (0x2692e6)
    at kfun:org.digieng.kmqtt.client.onDeliveryComplete#internal (0x37529e)
    at _6f72672e64696769656e673a6b6d7174742d636c69656e74_knbridge46 (0x37609b)
    at MQTTClient_cycle (0x410d96)
    at MQTTClient_run (0x40c52d)
    at  (0x7f4eb1b756db)
    at clone (0x7f4eb1686a3f)
    at  ((nil))
Aborted (core dumped)

After examining the libcurl ( https://github.com/JetBrains/kotlin-native/tree/master/samples/libcurl ) and curl ( https://github.com/JetBrains/kotlin-native/tree/master/samples/curl ) Kotlin Native samples there are two major differences (stuff not present). First difference is that the initRuntimeIfNeeded function isn't called inside the event handlers (C callbacks), and the second difference is that Kotlin Coroutines aren't used. Is the issue that is being encountered one of the corner cases mentioned in the article ( https://blog.jetbrains.com/kotlin/2020/07/kotlin-native-memory-management-roadmap/ )? Would highly appreciate some guidance from the Kotlin Native team on using Kotlin Coroutines with Kotlin Native's memory model (guides, key things to avoid, best practices etc).

Is yielding (yield) from a

memScoped{}

block safe/ok?

Does anyone know how to get frameworks to be found when running unit tests. I have a module that depends on another module which is using cinterops to talk to an iOS framework. I was able to get the test app to build by adding this.

kotlin {
    ios {
        val frameworkLocation = File(rootDir, "native/TestApp/Pods/Mapbox-iOS-SDK/dynamic/").absolutePath
        val frameworks = "-F$frameworkLocation"

        binaries.configureEach {
            linkerOpts(frameworks)
        }
    }
}

I get the following error when it runs the tests.

dyld: Library not loaded: @rpath/Mapbox.framework/Mapbox
  Referenced from: /Users/mkrussel/pangea/pangea-android/test-app-shared/build/bin/iosX64/debugTest/test.kexe
  Reason: image not found

How to include a header whose definition may be present or absent the host machine? I want to check that on runtime, and if was absent I wanna use a fallback. By the way if you wanted to know the use case, I wanted to do this for X11 header, as some linux may have a desktop and some don't...

I'm not able to generate Kotlin bindings for C headers on WSL using the gradlew, the task runs and in under 3 seconds build gets successful and no bindings are getting generated. Anybody encountered the issue, and any solutions?

Hello, does anybody know how to specify KMM module in iOS project? I have core data model ("Order" for example) and have Order in my KMM Module, so xcode can't resolve from which module model is.

Are polymorphic calls in Kotlin/Native static or dynamic?

Can I debug it further, I don't see where could a worker be leaked?

Unfinished workers detected, 1 workers leaked!
Use `Platform.isMemoryLeakCheckerActive = false` to avoid this check.

Here's a small repro:

object Testing {
    val event = MutableSharedFlow<Int>(extraBufferCapacity = 8)

    init {
        event.subscriptionCount
                // .onEach { println("Subscription Count: $it") }  // Stub, For seeing the behavior
                .launchIn(CoroutineScope(Dispatchers.Unconfined))
    }
}

fun main() = runBlocking {
    Testing
}

Edit: Sometimes the following error is generated as well:

Memory leaks detected, 76 objects leaked!
Use `Platform.isMemoryLeakCheckerActive = false` to avoid this check.

Is there way to create CPointer of Kotlin Objects?

Is there way to create sth like

commonNativeMain

module for all native modules? If yes how, and how to access kotlin.native packages there. I tried using

val commonNativeMain by creating { ... }

But that doesn't seem to access kotlin.native packages...

Are enums always 'frozen' after creation? Is there any way around that?

How do you include some cinterop headers in a library? I've added the headers like this

linuxX64 {
    val main by compilations.getting
    main.cinterops.create("x11") {
        defFile("src/linuxX64Main/cinterop/x11.def")
        compilerOpts.add("-I" + rootDir.resolve("include"))
    }
}

library compiles fine, and published to mavenLocal fine, but when some other project add it as a dependency and runs the linker, it produces the following

> Task :linkReleaseExecutableLinuxX64
e: C:\Users\Animesh\.konan\dependencies\msys2-mingw-w64-x86_64-clang-llvm-lld-compiler_rt-8.0.1/bin/ld.lld invocation reported errors

The C:\Users\Animesh\.konan\dependencies\msys2-mingw-w64-x86_64-clang-llvm-lld-compiler_rt-8.0.1/bin/ld.lld command returned non-zero exit code: 1.
output:
ld.lld: error: undefined symbol: XOpenDisplay
>>> referenced by out
>>>               C:\Users\Animesh\AppData\Local\Temp\konan_temp3813013133705122841\result.o:(kfun:com.github.animeshz.keyboard.X11KeyboardHandler#prepare(){})

ld.lld: error: undefined symbol: XPeekEvent
>>> referenced by out
>>>               C:\Users\Animesh\AppData\Local\Temp\konan_temp3813013133705122841\result.o:(kfun:com.github.animeshz.keyboard.X11KeyboardHandler#readEvents(){})

ld.lld: error: undefined symbol: XCloseDisplay
>>> referenced by out
>>>               C:\Users\Animesh\AppData\Local\Temp\konan_temp3813013133705122841\result.o:(kfun:com.github.animeshz.keyboard.X11KeyboardHandler#cleanup(){})

> Task :linkReleaseExecutableLinuxX64 FAILED

Don't the c-interop symbols get shipped with the artifact?