kotlinlang #kotlin-native

This shows up in auto-complete. And IntelliJ doesn't complain. But the compiler ends up crashing. Also, auto-complete finds some functions which do work, like :

val tempPath = GetTempPath?.invoke(nBufferLength, buffer)

.. I'm a bit lost as to what I can expect to work? What's a good place to find a correct definition of what works?

Prateek Grover

01/08/2020, 10:04 AM

can Kotlin Native access swift classes and understand them somehow?

Big Chungus

01/08/2020, 1:17 PM

Is there a way to set

linkerOpts

either in gradle config or

*.def

file to be output of

pkg-config --libs <LIB>

ribesg

01/08/2020, 1:55 PM

I have a problem with

val

companion object

having incorrect value on iOS, anyone saw anything about that? For example I have this in a subclass of

UICollectionViewCell

(hence the object superclass):

companion object : UICollectionViewCellMeta() {
        const val HEIGHT = 100.0
    }

But when I print the value of

HEIGHT

anywhere it has a nonsense value, maybe returning a pointer or reading random memory, it returns something like 6e-310. It also does not return the same value every time its read from different instances of the subclass of

UICollectionViewCell

. Wtf? Note: Removing

const

doesn’t change anything. No problem if the

val

is global, local to the class or a getter (

val HEIGHT: Double get() = 100.0

)

Big Chungus

01/08/2020, 2:37 PM

Does anyone know why when I build K/N GTK3 app on windows, the normal execution of .exe opens a terminal window as well?

gonzooin

01/08/2020, 2:44 PM

message has been deleted

Big Chungus

01/08/2020, 5:19 PM

I'm getting

ld.lld: error: unable to find library -lglib-2.0

when linking for linux.

-lglib-2.0

is one of the linkerOpts. Any suggestions on what's wrong?

Big Chungus

01/08/2020, 8:47 PM

From K/N CInterop guide on kotlin webpage:

We use the staticCFunction{..} helper function from Kotlin/Native to wrap a Kotlin lambda function into a C function pointer. It only allows having unbound and non-capturing lambda functions.

Could someone elaborate on what it means by

unbound and non-capturing lambda functions

. Does it mean that for instance if you want to register callbacks from c they cannot be in a kotlin class, but rather only top-level function?

napperley

01/08/2020, 9:31 PM

Will there be a separate Kotlin Native survey for non mobile developers (aka all the other Kotliners using Kotlin Native, which is a very LARGE group)? According to the Kotlin 2019 survey ( https://www.jetbrains.com/lp/devecosystem-2019/kotlin/ ) by JB with the Which platforms do you target? question (in the Kotlin Native section), the top target is Linux at 74% (large), Android at 48%, MacOS at 47%, and Windows at 45%. The iOS answer is significantly smaller at 28% (not very large).

🤔 1

Lei Wu

01/09/2020, 8:30 AM

How to export a “static method” in kotlin to a “class method” in objective-c? I have a object class like this in kotlin:

object LogUtil {

  fun log(message: String) {
    
  }
}

but export to ios framework, the class defined like this:

*__attribute__*((objc_subclassing_restricted))

*__attribute__*((swift_name("LogUtil")))

*@interface* CommonLogUtil : KotlinBase

+ (

*instancetype*)alloc *__attribute__*((unavailable));

+ (

*instancetype*)allocWithZone:(*struct* _NSZone *)zone *__attribute__*((unavailable));

+ (

*instancetype*)logUtil *__attribute__*((swift_name("init()")));

- (

*void*)logMessage:(NSString *)message *__attribute__*((swift_name("log(message:)")));

*@end*;

As code shows that “logMessage” method is not a “class method”, the expected result maybe like this:

+ (*void*)logMessage:(NSString *)message *__attribute__*((swift_name("log(message:)")));

Kavan

01/09/2020, 4:18 PM

Why it crash with this

dispatch("Hello") {
        println("Printing $it from Thread Started \n")
    }

and not with this ?

dispatch("Hello") {
        println(it)
        println("Printing from Thread Started \n")
    }

Code:

fun <P, T> dispatch(param: P, block: (P) -> T) {
    val ref = StableRef.create(param to block)
    pthread_create(nativeHeap.alloc<pthread_tVar>().ptr, null, staticCFunction { data: COpaquePointer? ->
        data?.asStableRef<Pair<P, (P) -> T>>()?.get()?.let { it.second.invoke(it.first.freeze()) }
        NULL
    }.reinterpret(), ref.asCPointer())
    ref.dispose()
}

Big Chungus

01/09/2020, 4:34 PM

Has anyone encountered this error when linking with gradle plugin?

Exception in thread "main" org.jetbrains.kotlin.konan.KonanExternalToolFailure:             The /home/mpetuska/.konan/dependencies/clang-llvm-8.0.0-linux-x86-64/bin/clang command returned non-zero exit code: 1.
            output: clang-8: error: no such file or directory: '
'

I'm on manjaro linux

jdiaz

01/10/2020, 2:49 PM

Has anyone used Linux target with glibc 2.12? I'm having trouble as it's looking for 2.14 and not finding it

jmillner_

01/10/2020, 3:10 PM

I’ve made it to step 4 in this guide, but for some reason my Kotlin code is unable to recognise the

libcurl.*

import? Even though I have the libcurl.def in the correct nativeInterop sub folder under

src

Patrick

01/10/2020, 3:22 PM

Is there a way to integrate some .dll files or .exe files into a KN windows binary? Right now I have to include the libraries in the same folder.

Kris Wong

01/10/2020, 6:45 PM

are atomicfu classes mutable by any thread?

Kavan

01/11/2020, 1:00 PM

Kotlin WorkerPool Implementation Just sharing code so others can use https://redfox.js.org/worker-pool.html

ftomassetti

01/12/2020, 8:41 AM

(It is a library for building languages: I use it with ANTLR and the Java target, I would like to use it also with ANTLR and the C++ target)

Big Chungus

01/12/2020, 11:13 AM

How can i get something similar to

private val dispatcher= Executors.newSingleThreadExecutor().asCoroutineDispatcher()

on native?

Big Chungus

01/12/2020, 3:52 PM

How can i go around constant

kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen

for any top-level object I declare?

jk2018

01/12/2020, 7:24 PM

Got a question about "

kotlinx.cinterop.staticCFunction

" when called as a callback from C . (Thread/SO link)

StefMa

01/13/2020, 7:06 AM

Does have dependencies have to compile with the same version as the Kotlin version in my project?

:yes: 4

Kavan

01/13/2020, 9:20 AM

Here are most of developers. Asking one silly question. 😅 I need one thing to improve. I'm totally bad in variable naming. Is there any way to improve it ?

Mateusz Konieczny

01/13/2020, 9:39 AM

Is it possible to implement a cross-platform GUI using Kotlin/Native? In my case I want to draw some rectangles, nothing more. (at least on Linux on Android, maybe also Windows and iOS) https://cantina.co/kotlin-native-naughty-or-nice/ has "no true cross-platform Kotlin GUI. Without those capabilities, I had to make some compromises. I decided to replace all the UI code with a character-based user interface instead." But maybe it is outdated nowadays?

Big Chungus

01/13/2020, 10:21 AM

How can i create an object on worker thread and then reference it again on another worker execution? Trying to implement redux pattern on background worker...

andreasmattsson

01/13/2020, 10:23 AM

Could anyone please provide an example of how to call a c-function that takes a va_list argument from Kotlin Native? e.g.

vsnprintf

Thomas

01/13/2020, 10:43 AM

Does anyone know what the following error means? I tried compiling my Kotlin code as a watchOS framework but I keep getting the following error when running from Xcode.

Kris Wong

01/13/2020, 4:44 PM

any guidance on how we should use @ThreadLocal with an object that should be closed?

Kris Wong

01/13/2020, 5:05 PM

oi, running into this error in my iOS tests https://github.com/JetBrains/kotlin-native/issues/3219

Holger Steinhauer [Mod]

01/13/2020, 8:23 PM

Hey folks. I am playing around with Kotlin Native and hit the wall very early on. Running

./gradlew build

produces a weired error (see stacktrace)

Unbenannt

Title

Holger Steinhauer [Mod]

01/13/2020, 8:23 PM

Hey folks. I am playing around with Kotlin Native and hit the wall very early on. Running

./gradlew build

produces a weired error (see stacktrace)

Unbenannt

My build.gradle looks like that:

plugins {
    id 'org.jetbrains.kotlin.multiplatform' version '1.3.61'
}

repositories {
    mavenCentral()
}

kotlin {
  macosX64("macos") {
    binaries {
      executable{}
    }
  }
  mingwX64("windows") {
    binaries {
      executable{}
    }
  }
}

wrapper {
  gradleVersion = "6.0.1"
  distributionType = "ALL"
}

It doesn’t matter whether I use Java 8 (Oracle) or 11 (OpenJDK)

Yes. I will need a Windows build host for the minwx64. But it doesn’t seem to matter whether it is defined or not

Dico

01/14/2020, 12:53 AM

The problem is during compiling macos build, it says invalid argument.

Artyom Degtyarev [JB]

01/14/2020, 7:07 AM

We got the same issue reported recently(https://github.com/JetBrains/kotlin-native/issues/3725). Can you try to use different Gradle version? IIRC, there was some problem with 6.0.1, maybe something is wrong there. Also it would be nice if you can extend the report with

--info

output.

Holger Steinhauer [Mod]

01/14/2020, 9:39 AM

I'll have a look and will comment on the GitHub oder, thanks @Artyom Degtyarev [JB]

🙏 1

Also, thanks for the clarification, @Dico

@Artyom Degtyarev [JB] So I tried Gradle 6.0.1, 6.0 and 5.6.4. All sho the same issue

Same for version 5.5.1

Artyom Degtyarev [JB]

01/14/2020, 2:03 PM

Okay, thanks! And what about

./gradlew compileKotlinMacos --info

? This flag can also help to extract arguments sent to

konanc

, for CLI use - as I mentioned in the issue.

Holger Steinhauer [Mod]

01/14/2020, 2:05 PM

Will try in a minute. In the meantime, I commented on the issue and attached the

--info

output from

build

🙏 1

👀 1

Here we go:

> Task :compileKotlinMacos FAILED
Caching disabled for task ':compileKotlinMacos' because:
  Build cache is disabled
Task ':compileKotlinMacos' is not up-to-date because:
  Task has failed previously.
file or directory '/Users/holger/projects/customers/Customer 01/20200110 - CSV/repo/src/commonMain/kotlin', not found
file or directory '/Users/holger/projects/customers/Customer 01/20200110 - CSV/repo/src/commonMain/kotlin', not found
Run tool: konanc with args: -g -ea -target macos_x64 -p library -o /Users/holger/projects/customers/Customer 01/20200110 - CSV/repo/build/classes/kotlin/macos/main/repo.klib -Xmulti-platform -no-endorsed-libs /Users/holger/projects/customers/Customer 01/20200110 - CSV/repo/src/macosMain/kotlin/hello.kt
Starting process 'command '/Users/holger/.asdf/installs/java/openjdk-11.0.1/bin/java''. Working directory: /Users/holger/projects/customers/Customer 01/20200110 - CSV/repo Command: /Users/holger/.asdf/installs/java/openjdk-11.0.1/bin/java -Dawt.toolkit=sun.lwawt.macosx.LWCToolkit -Dfile.separator=/ -Dftp.nonProxyHosts=local|*.local|169.254/16|*.169.254/16 -DgopherProxySet=false -Dhttp.nonProxyHosts=local|*.local|169.254/16|*.169.254/16 -Djava.awt.graphicsenv=sun.awt.CGraphicsEnvironment -Djava.awt.printerjob=sun.lwawt.macosx.CPrinterJob -Djava.class.path=/Users/holger/.gradle/wrapper/dists/gradle-5.5.1-bin/cfsov38hb3r1zj4ic9bbjcc7n/gradle-5.5.1/lib/gradle-launcher-5.5.1.jar -Djava.class.version=55.0 -Djava.home=/Users/holger/.asdf/installs/java/openjdk-11.0.1 -Djava.library.path=/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/nativelib -Djava.runtime.name=OpenJDK Runtime Environment -Djava.runtime.version=11.0.1+13 -Djava.specification.name=Java Platform API Specification -Djava.specification.vendor=Oracle Corporation -Djava.specification.version=11 -Djava.vendor=Oracle Corporation -Djava.vendor.url=<http://java.oracle.com/> -Djava.vendor.url.bug=<http://bugreport.java.com/bugreport/> -Djava.vendor.version=18.9 -Djava.version=11.0.1 -Djava.version.date=2018-10-16 -Djava.vm.compressedOopsMode=Zero based -<http://Djava.vm.info|Djava.vm.info>=mixed mode -Djava.vm.name=OpenJDK 64-Bit Server VM -Djava.vm.specification.name=Java Virtual Machine Specification -Djava.vm.specification.vendor=Oracle Corporation -Djava.vm.specification.version=11 -Djava.vm.vendor=Oracle Corporation -Djava.vm.version=11.0.1+13 -Djdk.debug=release -Dkonan.home=/Users/holger/.konan/kotlin-native-macos-1.3.61 -Dkotlin.environment.keepalive=true -Dlibrary.jansi.path=/Users/holger/.gradle/native/jansi/1.17.1/osx -Dline.separator=
 -Dorg.gradle.appname=gradlew -Dorg.jetbrains.kotlin.cliMessageRenderer=GradleStyle -Dos.arch=x86_64 -Dos.name=Mac OS X -Dos.version=10.15.2 -Dpath.separator=: -DsocksNonProxyHosts=local|*.local|169.254/16|*.169.254/16 -Dsun.arch.data.model=64 -Dsun.boot.library.path=/Users/holger/.asdf/installs/java/openjdk-11.0.1/lib -Dsun.cpu.endian=little -Dsun.cpu.isalist -<http://Dsun.io|Dsun.io>.unicode.encoding=UnicodeBig -Dsun.java.command=org.gradle.launcher.daemon.bootstrap.GradleDaemon 5.5.1 -Dsun.java.launcher=SUN_STANDARD -Dsun.jnu.encoding=UTF-8 -Dsun.management.compiler=HotSpot 64-Bit Tiered Compilers -Dsun.os.patch.level=unknown -Duser.dir=/Users/holger/projects/customers/Customer 01/20200110 - CSV/repo -Duser.home=/Users/holger -Duser.name=holger -Duser.timezone -Xmx3G -Dfile.encoding=UTF-8 -<http://Djava.io|Djava.io>.tmpdir=/var/folders/5c/2z1wrqmd00jf2wqgd8c4ytzh0000gn/T/ -Duser.country=GB -Duser.language=en -Duser.variant -ea -cp /Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/kotlin-stdlib.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/klib.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/Runtime.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/protobuf-java-2.6.1.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/shared.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/kotlin-util-io.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/kotlin-script-runtime.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/kotlin-compiler.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/kotlin-reflect.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/konan.metadata.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/kotlin-util-klib.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/utilities.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/backend.native.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/trove4j.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/StubGenerator.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/konan.serializer.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/kotlinx.cli-jvm.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/kotlin-native-utils.jar:/Users/holger/.konan/kotlin-native-macos-1.3.61/konan/lib/Indexer.jar org.jetbrains.kotlin.cli.utilities.MainKt konanc @/var/folders/5c/2z1wrqmd00jf2wqgd8c4ytzh0000gn/T/konancArgs1107009468518817141.lst
Successfully started process 'command '/Users/holger/.asdf/installs/java/openjdk-11.0.1/bin/java''
e: Invalid argument: -
i: Use -help for more information
:compileKotlinMacos (Thread[Execution worker for ':',5,main]) completed. Took 1.559 secs.

FAILURE: Build failed with an exception.

Hope it helps

Artyom Degtyarev [JB]

01/14/2020, 2:11 PM

Yep, I see. The problem is just about whitespace-dash-whitespace in the path. There is

GSM Treuhand/20200110 - CSV/repo/

fragment, compiler supposes that as some kind of empty flag and breaks up. I think it can be fixed with the next release, but for now the quickest solution will be the directory rename. Can you give it a try?

Holger Steinhauer [Mod]

01/14/2020, 2:33 PM

Will do

sksk

01/14/2020, 3:27 PM

@Holger Steinhauer [Mod] you might want to filter the customer name in your comments, never good idea to publicly show that stuff

Holger Steinhauer [Mod]

01/14/2020, 4:19 PM

Good point. Forgot about that, wanted to get this out of the way

Yep, it is due to the spaces and the - in the path

🎉 1

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