kotlinlang #kotlin-native

class Repository {
    companion object Data {
        var lastUpdate: String? = null
        var countriesListWithSummary: List<CountrySummary> = emptyList()
    }
}

when I compile it for iOS, I get these warnings:

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

and on runtime I actually get this crash:

kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen mypackage.Repository.Data@3310e88

How should I handle this situation?

Elka

09/16/2020, 8:30 AM

Hello any idea on how I can print the value of a global variable/method when debugging in native:

// In Constant.kt

val x: Int = 0
fun doSomething(): String

Daniele B

09/16/2020, 5:10 PM

I have a question about

StateFlow

on Kotlin/Native. Let’s say StateFlow is holding/passing an immutable data object, and it’s collected on the iOS side on

Dispatchers.Main

, to be used with SwiftUI. On the Application Logic side, I’m processing/setting the new StateFlow values (by using the Kotlin

copy

function), inside a coroutine. My question is: according to the current Kotlin/Native multithreading system, should such coroutine where I am processing/setting the new StateFlow values run on

Dispatchers.Main

or it can also use a background thread (e.g. Dispatchers.Default)? Being the value immutable, I wonder if

StateFlow

is able to provide thread safety under the hood, without having to care what is the thread where the new value is set.

alex_vinz

09/17/2020, 8:49 AM

Guys, can anyone help with adding iOS library to shared KMM module? Struggling for 3 days already and cannot make it working... The latest error I get when building app in xcode:

Undefined symbols for architecture x86_64:

"_OBJC_CLASS_$_FIROptions", referenced from:

objc-class-ref in shared(result.o)

"_OBJC_CLASS_$_FIRApp", referenced from:

objc-class-ref in shared(result.o)

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Martin Gagnon

09/17/2020, 1:21 PM

Since I have enabled Bitcode in my app, I cannot figure out how to get a clean call stack in Crashlytics. • Kotlin 1.4 • Bitcode enabled • Dsyms downloaded from the App Store Connect (Crashlytics does not complains of missing Dsyms) • Static Framework • CrasKIos (with latest version of Crashlytics) Any hints would be appreciated: Details in :thread-please:

Daniele B

09/17/2020, 2:19 PM

ld: warning: ignoring file myApp/shared/build/xcode-frameworks/shared.framework/shared, building for iOS Simulator-arm64 but attempting to link with file built for iOS Simulator-x86_64

Diego

09/17/2020, 2:22 PM

Hello guys. In my common library I have two iOS targets

iosArm64

and

iosX64

. I have configured them to generate a

.framework

with the following code:

iosArm64() {
    binaries {
        framework {
            baseName = "KiplingCommonArm64"
        }
    }
}
iosX64() {
    binaries {
        framework {
            baseName = "KiplingCommonX64"
        }
    }
}

Like with any other third party iOS framework, I would like to have a single one that can run in the simulator and the real devices. Is that possible? If so, how can I do it?

ribesg

09/17/2020, 3:23 PM

How do you, from a coroutine A, run something on another thread (a Ktor request or any coroutine B) and suspend while waiting for the result, without freezing coroutine A, using 1.3.9-native-mt?

👀 1

dazza5000

09/17/2020, 6:24 PM

I am trying to call a function that is parented to a sealed class - when I try to access the method in iOS I get the following (is this a known issue):

Application Specific Backtrace 1:
0   CoreFoundation                      0x00007fff23e3de6e __exceptionPreprocess + 350
1   libobjc.A.dylib                     0x00007fff512a19b2 objc_exception_throw + 48
2   CoreFoundation                      0x00007fff23e5eb94 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3   CoreFoundation                      0x00007fff23e4286c ___forwarding___ + 1436
4   CoreFoundation                      0x00007fff23e44b58 _CF_forwarding_prep_0 + 120
5   FivestarsPay                        0x000000010be83ae7 $s12FivestarsPay0aB8ListenerC02onaB5Event09fivestarsbE0ySo06SharedabE0C_tF + 1655
6   FivestarsPay                        0x000000010be83cc4 $s12FivestarsPay0aB8ListenerC02onaB5Event09fivestarsbE0ySo06SharedabE0C_tFTo + 68
7   shared                              0x000000010beed242 objc2kotlin.278 + 802
8   shared                              0x000000010bed2c48 kfun:fivestars.okpayplugin.OkPayPlugin#handleAction(com.fivestars.integration.okpayplugin.model.Action;kotlin.String?;kotlin.String?){} + 3688
9   shared                              0x000000010bed14b7 kfun:fivestars.Plugin.object-1.userContentController#internal + 1495
10  shared                              0x000000010bed19dc _496e746567726174696f6e3a706f696e746f6673616c65_knbridge20 + 300
11  WebKit                              0x00007fff2d44f4b1 _ZN28ScriptMessageHandlerDelegate14didPostMessageERN6WebKit12WebPageProxyEONS0_13FrameInfoDataERN7WebCore21SerializedScriptValueE + 217
12  WebKit                              0x00007fff2d5febf3 _ZN6WebKit29WebUserContentControllerProxy14didPostMessageERN3IPC10ConnectionEN3WTF16ObjectIdentifierINS_26WebPageProxyIdentifierTypeEEEONS_13FrameInfoDataEyRKNS1_13DataReferenceE + 175
13  WebKit                              0x00007fff2d809f16 _ZN6WebKit29WebUserContentControllerProxy17didReceiveMessageERN3IPC10ConnectionERNS1_7DecoderE + 146
14  WebKit                              0x00007fff2d2bae6a _ZN3IPC18MessageReceiverMap15dispatchMessageERNS_10ConnectionERNS_7DecoderE + 114
15  WebKit                              0x00007fff2d53599a _ZN6WebKit15WebProcessProxy17didReceiveMessageERN3IPC10ConnectionERNS1_7DecoderE + 24
16  WebKit                              0x00007fff2d2a993c _ZN3IPC10Connection15dispatchMessageENSt3__110unique_ptrINS_7DecoderENS1_14default_deleteIS3_EEEE + 158
17  WebKit                              0x00007fff2d2a8f71 _ZN3IPC10Connection24dispatchIncomingMessagesEv + 377
18  JavaScriptCore                      0x00007fff26aaaa15 _ZN3WTF7RunLoop11performWorkEv + 549
19  JavaScriptCore                      0x00007fff26aaab82 _ZN3WTF7RunLoop11performWorkEPv + 34
20  CoreFoundation                      0x00007fff23da1c91 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
21  CoreFoundation                      0x00007fff23da1bbc __CFRunLoopDoSource0 + 76
22  CoreFoundation                      0x00007fff23da1394 __CFRunLoopDoSources0 + 180
23  CoreFoundation                      0x00007fff23d9bf8e __CFRunLoopRun + 974
24  CoreFoundation                      0x00007fff23d9b8a4 CFRunLoopRunSpecific + 404
25  GraphicsServices                    0x00007fff38c05bbe GSEventRunModal + 139
26  UIKitCore                           0x00007fff49372964 UIApplicationMain + 1605
27  FivestarsPayHyperloop               0x000000010b81eb25 main + 1173
28  libdyld.dylib                       0x00007fff5211c1fd start + 1
29  ???                                 0x0000000000000001 0x0 + 1

natario1

09/18/2020, 4:53 PM

Can anyone explain why cinterop tasks depend on the project dependencies? 😕 what's the use case here? https://github.com/JetBrains/kotlin/blob/a766369e7283d7b89a5ca2960460dc20365f919a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/KotlinNativeTargetConfigurator.kt#L389-L405 My project

depends on

project(":Y")

and on some cinterop libraries. Because of how cinterop tasks are configured by the Kotlin plugin, anytime

changes, all the interops are executed again, slowing down the build.

napperley

09/20/2020, 9:13 PM

Keep on seeing a buffer overflow type effect occurring when writing messages to a log file. Some of the written messages have the timestamp included twice. What could cause a buffer overflow to occur?

Sourabh Rawat

09/21/2020, 3:05 AM

Getting

C:\Users\srawa\.konan\dependencies\msys2-mingw-w64-x86_64-clang-llvm-lld-compiler_rt-8.0.1\bin\ld: cannot find -lcurl

I installed libcurl following https://github.com/JetBrains/kotlin-native/blob/master/samples/libcurl/README.md. Not sure what the problem is.

Kroppeb

09/22/2020, 12:48 PM

I'm trying to figure out if it's possible to start an executeable and wait for it to close. I have found https://stackoverflow.com/questions/51460921/kotlin-native-execute-an-executable, but that uses the "exec" family which won't return after the process is finished it seems?

Kroppeb

09/22/2020, 1:30 PM

I'm trying to make a simple ui with "libui" on windows but I can't get my code to start. After some tweaking it seems it wants a file at

<KONAN_DATA_DIR or user dir>/.konan/dependencies/msys2-mingw-w64-x86_64-clang-llvm-lld-compiler_rt-8.0.1/bin/windres

But I have no idea what's supposed to be there

EvaS

09/22/2020, 3:31 PM

Hi, Does anyone know how to use

kotlin.native.internal

with Kotlin 1.4 ? It says "unresolved reference" but I see a lot of message mentioning it. Did it change ?

eenriquelopez

09/23/2020, 9:23 AM

Hi folks. I am trying to compile some Kotlin code to Swift, and particularly some enums. The enums in Swift are compiled as a class instead of a struct. Later on, I want this compiled class to extend from Decodable, but I receive a message "`Implementation of 'Decodable' cannot be automatically synthesized in an extension in a different file to the type`", since they would need to be on the same file. I wonder if any of you have hit this problem. Is it possible to specify in K/N that a enum should compile to a struct instead of an enum?

James Smith

09/23/2020, 10:43 AM

Hi, I'm trying to add Swift-only pod to K/N by adding a Swift wrapper with @objc on top. I created a separate project, created a pod out of it, but the build fails with ambiguous message

xcodebuild failed with error 65

. If I try to add the @objc wrapper directly to the pod in question, the build fails with

Undefined symbols for architecture x86_64:

"_OBJC_CLASS_$__TtC11CryptoSwift9CryptoAES", referenced from:

objc-class-ref in result.o

Which references exactly the wrapper that I created. What am I missing?

Nikky

09/23/2020, 11:33 AM

so..i have a hobby project that would be nice to put on a raspi, but i might need it to expose a website for configuring it live (just editing a file) is any of the webserver libraries around suitable to be compiled for arm on raspberry pi ? so far in my googling all of those just mentioned graalvm and similar.. which i don't really want to deal with i just need very simple basic http functionality of PUT or POST to set different variables and GET routes to server static html and js

alex_vinz

09/24/2020, 3:25 PM

When developing in commonModule I lint issue that says "Expected class 'SomeClass' has no actual declaration in module shared_iosArm64Main for Native. Though code compiles and works on emulator & real device

James Smith

09/25/2020, 12:12 PM

Any idea how to make native library without cocoapod work? I'm following these instructions: https://kotlinlang.org/docs/mobile/add-dependencies.html#add-a-library-without-cocoapods But I get the following error when I try to run the tests:

dyld: Library not loaded: @rpath/MyFramework.framework/MyFrameworkMyFramework

Referenced from: /redacted/path/build/bin/ios/debugTest/test.kexe

Reason: image not found

My gradle setup is exactly as in the article, there are no warnings from the linker. I've checked several resources about xcode problems like this, tried settings from these answers: https://stackoverflow.com/questions/27174371/ios-8-dynamic-framework-library-not-loaded https://stackoverflow.com/questions/45542928/load-custom-dynamic-library-dylib-in-ios-application

Arnaud Vallat

09/26/2020, 5:30 PM

Hi, I'm able to leverage kotlin native to target different platform and ABIs. Right now I'm trying to target arm32 but not hard float. I can't use android arm32 because the target device is not android. Looking up in Slack I see questions about arm32 soft float too but I haven't found anyone managing to target this specific abi. Is there a way to pass a compiler options to clang while building via konanc so that mfloat-abi can be pass as soft? Is the only solution to build kotlin-native locally and change konan.properties? Thank you a lot for your help.

Roger Kreienbühl

09/27/2020, 1:46 PM

Hi I’m really new to Kotlin Native. I’m trying to develop with Kotlin Nativ for Raspberry Pi. I successfully added the pigpio library and can use it, but sometimes I have the problem, that the program exits with:

sigHandler: Unhandled signal 11, terminating

My code looks like this:

package ch.lichtwellenreiter.omrr

import kotlinx.cinterop.staticCFunction
import pigpio.*

const val GPIO_BUTTON = 6
var lastChange: UInt = 0u

fun main() {
    initGPIO()
    setupButton()

    while (true) {}
}

private fun initGPIO() {
    if (gpioInitialise() < 0) {
        println("GPIO Error initialising")
        return
    }
}

private fun setupButton() {
    val buttonPort = GPIO_BUTTON.toUInt()
    initPortWithMode(buttonPort, PI_INPUT)

    gpioSetAlertFunc(buttonPort, flankChangeDetected)
}

private fun initPortWithMode(port: UInt, mode: Int) {
    if (gpioSetMode(port, mode.toUInt()) < 0) {
        println("Could not set mode for GPIO$port")
        return
    }
}

val flankChangeDetected = staticCFunction<Int, Int, UInt, Unit> { gpio, level, tick ->
    val ticker = tick
    val pin = gpio
    val lvl = level


    when (lvl) {
        0 -> {
            val time = ticker - lastChange
            lastChange = ticker
            println(tick)
            if ((time > 55u && time < 61u) || (time > 113u && time < 119u)) println(time)
            println("Button Pressed down, level 0")
        }
        1 -> {
            val time = ticker - lastChange
            lastChange = ticker
            println(tick)
            if ((time > 55u && time < 61u) || (time > 113u && time < 119u)) println(time)
            println("Button released, level 1")
        }
        2 -> println("Button GPIO timeout, no level change")
    }
}

The error occurs not every time, I could not identify the exact place in code where it happens, but I think it is the access to

lastChange

inside the when expression. Has anyone some experience with such errors? Is there a way to copy the value from a C Int or UInt?

SrSouza

09/27/2020, 11:10 PM

Hi folks, newbe here in Kotlin Native and WASM, just for curiosity, there is someway to call a Rust function compiled to WASM from Kotlin Native that will target WASM as well?

myrronth

09/28/2020, 4:47 AM

As this should also be a Kotlin/Native problem, maybe this channel could help me out? 🙂

👀 1

Sam Garfinkel

09/28/2020, 5:04 PM

Will klibs ever enable embedding C source code to support JIT or at least portable dependencies? This would be really nice to have at least with Gradle, where pulling down say a libcurl wrapper also builds the C source on demand. Would make shipping wrappers far easier.

➕ 1

Martin Gagnon

09/28/2020, 9:28 PM

Just in case someone stumble on the same issue, I am investigating a crash that all our application that are updating to Kotlin 1.4 runs into: /Users/teamcity/buildAgent/work/cae0e6559deed4c4/runtime/src/main/cpp/Memory.cpp:1605: runtime assert: Recursive GC is disallowed The 4 applications were running fine under 1.3.60 and 1.3.70. They are about 1 year old each. I am trying to product a simple app to reproduce the issue but I cannot figure the setup to make that happen. The common denominator is this: • Swift class deinit gets call • The deinit

cancellableManager.cancel()

that cancel and frees a list of object. • The list inside the

cancellableManager

is replaced by a frozen new list (Stored inside an AtomicReference) • Assert happens I would really like some support from @cschramm here 😉 In any case, I’ll continue trying to understand this issue. Could it be possible that the GC can be triggered by the common code and simultaneously by Swift ? (Common Code triggers the GC -> this has an impact on the swift Code, swift code triggers the GC)?

ribesg

09/29/2020, 9:52 AM

I am also encountering a lot of various crashes in

Memory.cpp

. Looks like every time I relaunch my app it ends up crashing in a different place after a few seconds. It’s a big app, no way I can make a reproducer for these errors.

ribesg

09/29/2020, 1:58 PM

I don’t know if this one is different than the others, I get it 100% of the time on startup currently... Weird

Title

ribesg

09/29/2020, 1:58 PM

I don’t know if this one is different than the others, I get it 100% of the time on startup currently... Weird

svyatoslav.scherbina

10/07/2020, 12:43 PM

Might be fixed in 1.4.20. Not clear without full stacktrace. Please enable it: on the bottom right corner of debug navigator there is a toggle “Show only stack frames with debug symbols and between libraries”, it should be switched off.

ribesg

10/07/2020, 12:47 PM

Thanks for the tip, I switched it off and will try to keep it off in the future when reporting issues this way

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