kotlinlang #kotlin-native

java.lang.NoSuchMethodError: org.jetbrains.kotlin.konan.target.HostManager.<init>(Lorg/jetbrains/kotlin/konan/target/SubTargetProvider;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
        at org.jetbrains.kotlin.gradle.plugin.mpp.KotlinMultiplatformPlugin.setupDefaultPresets(KotlinMultiplatformPlugin.kt:149)
        at org.jetbrains.kotlin.gradle.plugin.mpp.KotlinMultiplatformPlugin.apply(KotlinMultiplatformPlugin.kt:81)
        at org.jetbrains.kotlin.gradle.plugin.mpp.KotlinMultiplatformPlugin.apply(KotlinMultiplatformPlugin.kt:38)
        at org.jetbrains.kotlin.gradle.plugin.KotlinBasePluginWrapper.apply(KotlinPluginWrapper.kt:77)
        at org.jetbrains.kotlin.gradle.plugin.KotlinBasePluginWrapper.apply(KotlinPluginWrapper.kt:39)
        at org.gradle.api.internal.plugins.ImperativeOnlyPluginTarget.applyImperative(ImperativeOnlyPluginTarget.java:42)

Does somebody know how to fix such exception, when using new MPP plugin and adding native "linuxX64" target on linux host?

11 replies · 3 participants

jkbbwr

10/30/2018, 10:18 PM

How can one enable kotlin coroutines in all the glory with the mpp plugin

👍 1

7 replies · 2 participants

groostav

10/30/2018, 10:38 PM

I'm looking to replace a couple of chunk of native code with kotlin native, and am wondering if I get any wins on my current mess of

dllexport

and

extern "C"

and

Native.loadLibrary

business

1 reply · 2 participants

orangy

10/30/2018, 10:40 PM

there is no documented interop between K/N and K/JVM other than standard JVM tools, like JNI

😢 2

3 replies · 3 participants

Nikky

10/30/2018, 11:17 PM

So, I want to get into microcontrollers, which ones can I use with kotlin?

13 replies · 3 participants

gaetan

10/31/2018, 9:16 AM

I’m trying to build the template idea project Kotlin (Mobile Android/iOS). When I launch the gradle build I have this error:

> Task :app:compileKotlinIos
xcrun: error: SDK "iphonesimulator" cannot be located
xcrun: error: SDK "iphonesimulator" cannot be located
xcrun: error: unable to lookup item 'Path' in SDK 'iphonesimulator'
exception: org.jetbrains.kotlin.konan.KonanExternalToolFailure: The /usr/bin/xcrun command returned non-zero exit code: 1.
        at org.jetbrains.kotlin.konan.exec.Command.handleExitCode(ExecuteCommand.kt:100)
        at org.jetbrains.kotlin.konan.exec.Command.getOutputLines(ExecuteCommand.kt:91)

XCode is installed and I can run the simulators from there. I don’t understand why the paths are not correct. Any idea?

5 replies · 2 participants

Dominaezzz

10/31/2018, 1:27 PM

Where is

MPPTools.defaultHostPreset

defined? (used in the `build.gradle`s of the samples).

2 replies · 2 participants

se1by

10/31/2018, 3:35 PM

Hey guys, I have a few issues with my project setup using IntellJ 2018.2.5 with the gradle plugin: 1) I don't have any autocompletion for 1.3 methods. e.g.

1.toByte()

does autocomplete,

1.toUInt()

does not. 2) My source directory (src/main/kotlin) is not marked as a source directory, which is a bit inconvenient. Already tried adding it explicitly by adding

main.kotlin.srcDirs += 'src/main/kotlin/'

to sourceSets 3) IntelliJ seems to think my package declaration should be

package kotlin.normal.package.name

instead of

package normal.package.name

Any ideas?

1 reply · 2 participants

Jurriaan Mous

10/31/2018, 5:01 PM

In what cases are objects like MutableList automatically frozen? I have a frozen array inside a mutable list but I cannot find the cause. Is there an easy way to debug it?

10 replies · 3 participants

Hamza

11/01/2018, 4:58 AM

hi, is kotlin native with arduino possible? I’m participating in a competition next week and i want to use arduinos. I want to try using arduino with kotlin/native!

8 replies · 3 participants

agrosner

11/01/2018, 1:03 PM

if its android-jvm then yes

4 replies · 3 participants

Ellen Shapiro

11/01/2018, 1:36 PM

I’ve been banging my head on this for a minute and could use some help: I’m trying to use

ktor

in an MPP iOS/Android project. As far as I can tell, you have to be able to use Coroutines to do this. I can get coroutines importing on gradle 4.10.2 to Android and the core thing, but they don’t work on iOS. I’m seeing some stuff about needing 4.7, but that’s not working either. Anyone got suggestions for how/if I can actually get this to work?

10 replies · 2 participants

bootstraponline

11/01/2018, 1:39 PM

I have a simple ktor example that works on iOS https://github.com/bootstraponline/run_blocking

4 replies · 3 participants

Ellen Shapiro

11/01/2018, 3:22 PM

I think part of it is that K/N doesn’t support coroutines off the main thread - does anyone know if there’s some place where an explanation of why is posted?

15 replies · 3 participants

olonho

11/02/2018, 3:03 PM

(repost of https://discuss.kotlinlang.org/t/clion-and-kotlin-native-1-3/10141) To ensure people who are focusing on pure native development feel good, along with the native support for MPP in Kotlin 1.3 we are happy to release Kotlin/Native support in the CLion IDE . Plugin can be installed into CLion 2018.3 EAP (183.4139), and allows to work with projects described using multiplatform Gradle DSL. Kotlin/Native samples were converted to MPP format, and can be opened in the CLion. Unfortunately, Groovy support is not included in CLion, so editing Gradle build files with the proper highlighting is not yet possible, but we are working on improving the situation here.

👍 9

🎉 10

6 replies · 4 participants

budioktaviyan

11/02/2018, 4:46 PM

Guys, Is there anyway to read a json file in the common code ? let say, I want to read a dummy json file to be parsed later using kotlin serialization

8 replies · 4 participants

Matej Kormuth

11/03/2018, 3:08 PM

Are there any plans to add support for viewing source code in IntelliJ (or others JB IDEs) for std library functions / langauge features? Because when I ctrl-click to

"".cstr

I only get to see function header with no body (only

/* compiled code */

comment).

➕ 5

5 replies · 3 participants

Quang Luong

11/03/2018, 3:14 PM

the doc seem oudated, what is the correct way to do kotlinString.cstr.getPointer(nativeHeap /*require autoFreeScope*/) (without writing a C function)

4 replies · 2 participants

elifarley

11/03/2018, 4:11 PM

Hi, are there any plans to provide an opt-in memory management based on ownership, similar to Rust ? I guess this could be important for high-performance systems programming, am I right?

57 replies · 6 participants

Hunter Breathat

11/03/2018, 4:40 PM

Hey so I was directed here as I'm currently have issues setting up kotlin native via Intellij ultimate. My issue is that it is not grabbing the dependencies from the pre-generated urls. Sorry if this seems stupid but I'm new to kotlin native

6 replies · 3 participants

Hunter Breathat

11/04/2018, 3:51 PM

Hey are we able to return more than 1 value or does that still require the Pair work around

6 replies · 4 participants

nestserau

11/05/2018, 9:47 AM

Good day! I’ve created an MPP project in IntelliJ CE and these are the warnings that I get in build.gradle for every property actually. What does it mean and how do I fix it?

7 replies · 3 participants

mersan

11/05/2018, 2:08 PM

Hi, which IDE do you use for Kotlin Native?

6 replies · 5 participants

Hunter Breathat

11/05/2018, 3:08 PM

Hey guys so I'm working on a project(personal) and I'm new to kotlin native I understand that it can Interop with C and when I'm using getenv and printing it to console it's stating CPointer then giving me the address of the pointer how to I have that returned as a String for example. I know that CPointer s are not nullable unless using null safes. What should I do

3 replies · 3 participants

Sangeet

11/05/2018, 5:02 PM

I getting Illegal State Exception when I am invoking higher order function from

dispatch_async_f(...)

25 replies · 3 participants

czuckie

11/05/2018, 6:42 PM

hey guys, is CLion the best way to develop kotlin native still? or we on intellij these days?

7 replies · 5 participants

katokay

11/05/2018, 8:13 PM

Even though I’m sure kotlin-native within the context iOS development is mostly focused around the native side. Has there been any thoughts or considerations around leveraging kotlin-js & kotlin-native together? There’s a compelling reason to use js for the runtime like react-native to ease the deployment for bugfixes, etc. ala CodePush / over-the-air updates. That said, a seamless interop exchange between the native layer and the JS layer would be very interesting. Is this already possible with multi-platform projects? Is this crazy?

6 replies · 4 participants

Title

katokay

11/05/2018, 8:13 PM

louiscad

11/05/2018, 8:26 PM

Makes me think about this: https://gist.github.com/sdeleuze/0da8c3d6a43c659977a16e017020503b

russhwolf

11/05/2018, 8:29 PM

Multiplatform doesn't give you anything new for communication between platforms. It's just for compile-time code-sharing.

katokay

11/05/2018, 8:32 PM

@louiscad I agree, it’s in the same spirit of those thoughts. It feels like Kotlin is extremely well positioned to do something very interesting (more so than already).

@russhwolf It could though in theory. If a js dependency could be fulfilled via a kotlin-native library for example. So using an example. The core app targeting both iOS and Android could “expect” to call an api to return the step count for the device. On Android the “actual” implementation would be a JVM implementation and return to the JS layer in the same way it does today with react-native sans “native modules” setup. On iOS the “actual” implementation would be the iOS SDK’s also avoiding the native interop concerns, or at least hides it away. I realize I’m probably naive in some of my thoughts, but it doesn’t seem a far stretch.

russhwolf

11/05/2018, 8:56 PM

You can't plug-and-play between different platforms the way you're describing. There's no way to "fulfill a js dependency with a kotlin-native library" because they're different platforms that compile to different formats. And when you want your JVM layer to "return to the JS layer in the same way it does today with react-native", now you're losing your seamless interop because you've added a JS bridging layer. That said, there's still a lot of potential around code-sharing. You just shouldn't assume it gives you any ability to move between platforms at runtime other than what already exists.

uli

11/05/2018, 9:23 PM

You could teach the compiler to generate a js/ios bridge layer

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