kotlinlang #kotlin-native

Cannot compile to wasm32 on win10/64 -compiler crashes: Exception occurred executing command line. Cannot run program "C:\Develop\kotlin-native-windows-0.4\bin\konanc" (in directory "C:\Develop\kotlin-native-windows-0.4\bin"): CreateProcess error=193, %1 ist keine zulässige Win32-Anwendung

1 reply · 2 participants

Attila Nyers

11/19/2017, 6:48 PM

Is it possible to build shared object for iOS and Android platform?

☝️ 1

1 reply · 2 participants

Simone Civetta

11/20/2017, 11:50 AM

Hi, I’ve successfully worked on supporting the iOS simulator for Kotlin Native. Should I submit a PR or maybe it’s not a priority?

👍 6

6 replies · 2 participants

Sergey Rubanov

11/20/2017, 6:11 PM

How big is kotlin-native wasm runtime? IIUC reference count should be in runtime, right?

2 replies · 2 participants

dsgryazin

11/21/2017, 3:39 PM

I'm digging into ios samples (upd: i read all the samples, kotlinconf app too), want to understand how they work we have

AppDelegate.h

AppDelegate.m

files with stub implementation in

@implementation AppDelegate

we also have AppDelegate.kt:

class AppDelegate : UIResponder(), UIApplicationDelegateProtocol
override fun init() = initBy(AppDelegate())

Please, correct my understandings in thread >

6 replies · 3 participants

Andrew

11/21/2017, 5:19 PM

Hi! Can I compile kotlin/native code from linux to windows?

2 replies · 2 participants

Andrew

11/21/2017, 5:54 PM

@Gronek Thanks for link

1 reply · 2 participants

ktw

11/22/2017, 8:25 AM

How can I create an NSDictionary with Kotlin Native? I want to write this code in KN NSDictionary *options = @{(id)kAXTrustedCheckOptionPrompt: @YES};

1 reply · 2 participants

elizarov

11/22/2017, 3:13 PM

@dsgryazin It will be available eventually everywhere, but the short-term goal is to provide it on JS. Moreover, the plan is to have a common subset of

kotlinx-coroutines-core

APIs that is available for all the platforms and can be used from the common code (the code that is shared between platforms)

👌 6

1 reply · 2 participants

Gronek

11/22/2017, 4:43 PM

I need to run tests with cli (I'm using CI system), how can I do that?

2 replies · 2 participants

Gronek

11/22/2017, 5:54 PM

one more thing, how can I connect to local database (postgresql/sqlite/mysql/mariadb) with kotlin native? I know, that I can do it with requery, but then i need to use JVM version. Do I have to use C-lang libraries?

2 replies · 2 participants

uliluckas

11/23/2017, 8:00 PM

Hi all, i recently played around with workers. I created a fixed set of wokers, scheduled some work and wanted these work loads to schedule new work to a worker out of this fixed set.

1 reply · 2 participants

uliluckas

11/23/2017, 8:02 PM

As a guess, I also tried passing the worker id, creating a new worker with this id which did not work either.

1 reply · 2 participants

snowe

11/24/2017, 12:51 AM

I'm new to native, ios, mac development etc. so I'm not sure what I've got to do here.

8 replies · 2 participants

goncalossilva

11/26/2017, 12:30 AM

I’m a bit lost with my K/N setup. My goal: to create a tiny project that targets JVM, JS, iOS, macOS and Windows, but shares the vast majority of the code (ie. a cross-platform library). I’m particularly stuck on iOS / macOS / Windows as none of the samples I have found actually reuse code from a

common

module. I’m also assuming that the whole

expect

actual

workflow wouldn’t work here, and that

stdlib

wouldn’t be available. Is this possible?

3 replies · 2 participants

sdeleuze

11/26/2017, 11:03 AM

Hey, I wanted to start playing with the WASM support I have been hoping since last year, but I was not able to go very far:

Target WASM32 is not available on the LINUX host

. Any chance to support Linux in next release ?

11 replies · 5 participants

sdeleuze

11/26/2017, 11:28 AM

I also would be interested to understand what part of Kotlin/Native, Konan etc. will be open source and what part will require closed source or commercial feature. Behind this question I would like to understand if Kotlin/Native will be a viable platform to develop Open Source native frontend/backend libraries and applications.

3 replies · 3 participants

kenkyee

11/26/2017, 12:05 PM

I don't think K/N includes cross compilation. It's probably translating kotlin too C or C++ and compiling that.

🇳🇴 1

5 replies · 3 participants

Gronek

11/26/2017, 6:51 PM

how can I compile program for windows on linux host?

3 replies · 3 participants

Simone Civetta

11/27/2017, 10:33 AM

In case somebody is interested on running a K/N native app in the iOS simulator, here is a tutorial I wrote => http://viteinfinite.com/2017/11/running-a-kotlinnative-ios-app-in-the-simulator/

👍🏻 5

👍 3

1 reply · 1 participant

kevin.cianfarini

11/27/2017, 5:25 PM

can I get a quick explanation of how this works?

1 reply · 2 participants

kevin.cianfarini

11/27/2017, 7:45 PM

or if anyone knows where I can read about this let me know

1 reply · 2 participants

11/27/2017, 7:53 PM

all, I'm looping through a loop and reading a variable value which doesn't change in the loop. Getting "*** Error in `./HelloWorld.kexe': free(): invalid next size (fast): 0x0000000002521930 ***"

6 replies · 2 participants

GauthierPLM

11/28/2017, 6:26 AM

Hi ! Little question, what is the best way to do IO that works on Linux & Windows using Kotlin native ?

7 replies · 3 participants

11/28/2017, 3:14 PM

All, I can reliably core dump kotlin-native with this code: https://gist.github.com/anonymous/273e1a4e01daece84e48523da9dc82a8

4 replies · 3 participants

GauthierPLM

11/28/2017, 3:21 PM

Is there a good way to know which are the sections of my code which take a lot of time ? I do some I/O reading, and guess is what take most of the time, but I would like to confirm it. (I do a lot of fgets(), around 1000 times, then split, filter and add this to a graph)

1 reply · 1 participant

louiscad

11/28/2017, 7:28 PM

Hi, I dowloaded Kotlin/Native to my computer using GitHub Desktop, and I'm trying to open the samples directory in CLion EAP (which has the Kotlin/Native plugin), but when I press "open" and select the "samples" directory, nothing happens. When I try "import from sources", it asks me to select files for a CMake project, and I don't know what to do since the samples seem to be built by gradle, and I don't know anything in CMake (I'm a true beginner in the native ecosystem). Could anyone help me in getting the samples open properly in CLion please?

55 replies · 2 participants

GauthierPLM

11/29/2017, 4:19 AM

Rewrote my Ruby program in Kotlin native, ended up with a 100 time slower program ... 😕 The parts which make is slower : - spliting a file of 1000 lines, and then spliting each line in 1000 elements - for each on each splited line - trim each string (won 10s by removing that) - getting a value in a collection seems slow too

12 replies · 2 participants

apatrida

11/29/2017, 4:05 PM

Is there an existing conversation somewhere on the plans for code sharing between native and JVM/Javascript as the other two can do? I'm not sure how that'll reconcile across memory management models but not all logic will care as much about what the container is doing. Any links?

6 replies · 2 participants

r4zzz4k

11/29/2017, 4:11 PM

Here's small question. I'm trying to consume libclang from K/N code. There is a function called

clang_visitChildren

which expects callback having C structs passed by values as parameters. When trying to use it as is, I'm getting the following error:

type CValue<CXCursor> is not supported in callback signature

. Do I understand correctly that the following workaround is the only way to go for now?

2 replies · 2 participants

Title

r4zzz4k

11/29/2017, 4:11 PM

Here's small question. I'm trying to consume libclang from K/N code. There is a function called

clang_visitChildren

which expects callback having C structs passed by values as parameters. When trying to use it as is, I'm getting the following error:

type CValue<CXCursor> is not supported in callback signature

. Do I understand correctly that the following workaround is the only way to go for now?

svyatoslav.scherbina

11/30/2017, 7:18 AM

Unfortunately, yes, in this case you need to add callback wrapper. You can add C code at the end of

.def

file after `---`: https://github.com/JetBrains/kotlin-native/blob/master/INTEROP.md#adding-custom-declarations Also you can make

CallbackWithPtrs

receive some user data using the following:

...
// [C++] My wrapper
typedef void (*CallbackWithPtrs) (Input*, void* userData);

struct WrapperCallbackUserData {
    CallbackWithPtrs callback;
    void* userData;
}

void WrapperCallback(Input input, void* userData) {
    WrapperCallbackUserData* data = (WrapperCallbackUserData*) userData;
    CallbackWithPtrs actualCallback = data->callback;
    actualCallback(&input, data->userData);
}

void wrapperVisitor(CallbackWithPtrs callback, void* userData) {
    struct WrapperCallbackUserData data;
    data.callback = callback;
    data.userData = userData;
    visitor(WrapperCallback, (void*) &data);
}         

// [Kotlin/Native] Wrapper usage
wrapperVisitor(staticCFunction({ input: CPointer<Input>, userData: COpaquePointer ->
    // use input.pointed
}))

r4zzz4k

11/30/2017, 12:08 PM

Oh, I forgot about the feature with C code in

.def

file. Yeah, I've decided to skip

userData

from example for simplicity. I'm going to use it with

StableObjPtr

in my own code, of course. Thank you very much!

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