kotlinlang #kotlin-native

lib => therefore all Fetchers are frozen • To tell a Fetcher which storage he needs to store the date into, I pass the Storage object in constructor. • PROBLEM: since Storage is then in the same object graph as the Fetcher, Storage becomes frozen. But it's counter-goal for a storage object. There should be a pattern for that, isn't it?

ribesg

05/23/2019, 12:43 PM

I need to pass a

kotlinx.cinterop.CPointer<kotlinx.cinterop.ObjCObjectVar<platform.Foundation.NSError?>>?

to an ObjC function, is it how you do it?

var error: NSError? = null
    val errorPtr = ObjCObjectVar<NSError?>(error.objcPtr()).ptr

👍 1

Ivan

05/23/2019, 4:24 PM

Hi guys, have a question here. I have few kn modules 1. knmoduleOne 2. knModuleTwo 3. knMain and main have first two as libs inside like this sourceSets { commonMain { dependencies { api project(":knmoduleOne") api project(":knModuleTwo") }}} when Im building it into ios lib, the classes from modules 1 and 2 have prefix in their names like KNMODULEONESomeClassName. Its kinda triggering, how to avoid that? just rename module during build or there is another way?

basher

05/23/2019, 4:32 PM

When you call

allocArray

, does it zero your memory, or do you have to use

memset

napperley

05/24/2019, 6:13 AM

What is required to get code completion to work in IntelliJ for a C library?

Paul Idstein

05/24/2019, 6:28 AM

I see the following error, when using on iOS simd_float4x4 references: type CValue<simd_float4x4> of return value is not supported here: not a structure or too complex. Any idea how to use accelerate types? Also simd_float2 or simd_float3 are not visible at all. Should map to a float*

Tukor Ferenc

05/24/2019, 12:48 PM

Hi, I have a question about memory management In the source of the Kotlin Runtime, inside Memory.cpp (https://github.com/JetBrains/kotlin-native/blob/20d3e12e7cdc60af02d7e7c4620f4b577b1141c8/runtime/src/main/cpp/Memory.cpp) I found this:

// If garbage collection algorithm for cyclic garbage to be used.
// We are using the Bacon's algorithm for GC, see
// <http://researcher.watson.ibm.com/researcher/files/us-bacon/Bacon03Pure.pdf>.
#define USE_GC 1

Does this define control all GC behaviour? If I set it to zero have I achieved manual memory management in all cases? Is there an easy to control option for this in any IDE that supports Kotlin or do I have to build my own runtime with the option set the way I want and then manually bind that runtime to my project?

Dominaezzz

05/25/2019, 3:39 PM

How likely is debugging in IntelliJ Ultimate? Are there any soon-ish plans for this?

napperley

05/26/2019, 1:12 AM

Spotted some mistakes in the 2nd code sample inside the Kotlin/Native as a Dynamic Library ( https://kotlinlang.org/docs/tutorials/native/dynamic-libraries.html ) article. The Linux version uses macosX64 as the target, and the MacOS version uses linuxX64 as the target. The targets should be reversed.

😮ctocat: 1

napperley

05/26/2019, 4:00 AM

Does the Kotlin Native version of the Kotlin Standard lib have functionality to intercept process interrupts/signals (eg when a user presses Ctrl+C)? Want to intercept a keyboard interrupt event, and cleanup resources before exiting the program.

Rohan Maity

05/26/2019, 10:19 AM

is there a way to run generated kexe file from IntelliJ Idea?

fun main() {
    val numbers = readLine()?.split(',')?.map {
        it.toInt()
    }
    println(numbers?.sum()?:"No Numbers")
}

I have written this code that takes input. When I run from terminal

./file.kexe

it works fine. But I want to create run configuration for running generated kexe file

which would take input also

like it does with

./file.kexe

Marc Knaup

05/26/2019, 10:45 AM

I'm trying to run tests on the iOS simulator. iOS test code is common test code only. It crashes in
Memory.cpp
and I have no hint what is causing this 😕 Does anybody have an idea? Found the cause. See comments. Sources: https://github.com/fluidsonic/fluid-time/tree/native-testing Output:

$ xcrun simctl spawn "iPhone 8" "/Users/marc/Documents/fluid-time/build/bin/iosX64/testDebugExecutable/test.kexe"
/Users/teamcity/buildAgent/work/4d622a065c544371/runtime/src/main/cpp/Memory.cpp:1216: runtime assert: memory state must be clear
Child process terminated with signal 6: Abort trap

Rohan Maity

05/26/2019, 2:10 PM

While I was doing

cinterop

for

stack

header file in c++. I encountered

Exception in thread "main" java.lang.Error: /usr/include/c++/7/bits/functexcept.h:42:1: error: unknown type name 'namespace'.

Is kotlin/native unable to determine

namespace

kpgalligan

05/26/2019, 3:51 PM

See ‘producer’ section here: https://medium.com/@kpgalligan/kotlin-native-stranger-threads-ep-1-1ccccdfe0c99

Marc Knaup

05/26/2019, 5:05 PM

What's the easiest way to debug the native compiler (in a multiplatform project)?

mansonheart

05/26/2019, 7:17 PM

@kpgalligan Sorry for strange question about test 🙂 I undestand your example about the User factory. But I 'm not finding usecase for detach object feature and can't undestand this feature fully. My naive thoughts is below in code 🙂. I had provided some comments about that. Looks like I need to write some production code to see concurrent patterns in Kotlin.

-.kt

jeremy

05/26/2019, 11:45 PM

How to unit test exceptions in KN? @Test(expected = Exception::class) results in error Cannot find a parameter with this name: expected

Timothy Wong

05/27/2019, 7:40 AM

Good day all, I was wondering if someone can link me some resources with using dynamic libraries with Kotlin Native -- Looking online gives me a surplus of articles of making an executable a dynamic library, and I am not the most familiar with the Kotlin Native ecosystem at the mment Edit: I looked through the available sample code at https://github.com/JetBrains/kotlin-native/blob/master/samples/curl/build.gradle, and I'll see how much success I have 🙂

jeremy

05/27/2019, 4:00 PM

Are any additional dependencies required to use Worker class outside of stdlib?

McEna

05/28/2019, 3:42 AM

Hey folks, is it possible to use OpenJDK for kotlin-native, or is Oracle's JDK still required?

Tukor Ferenc

05/28/2019, 12:17 PM

hi is it possible to turn off all automated memory management for Kotlin/Native? if yes, how? is there a convenient way to do it?

Ken Gilmer

05/28/2019, 4:41 PM

hello 🙂 . I wish to package a kotlin native program as a Debian source package. From my searches it doesn't appear that kotlin-native is a supported toolchain by Debian. Is this simply something that needs to be contributed by someone or is there more to the story?

McEna

05/28/2019, 7:23 PM

Hello to everyone. I have a tricky question. I have a multiplatform library project and I intend to consume it in non-kotlin projects (IE: regular java, macOs, javascript). How do I publish the artifacts outside of Maven? I know I can just open the jar files and get the binaries, but I want to see if there's a more structured solution, like publishing the javascript module to npm, or in a ready to be deployed to npm format, for example.

Marc Knaup

05/28/2019, 8:52 PM

How is an

inline class

represented in ObjC when it's boxed to

Any

let value: Any = someMap[…]
print(type(of: value)) // kobjcc3
print(value) // UiColor(argb=-570425344) - a wrapped Int (i.e. Int32 in ObjC)

as! Int32

doesn't work

as! KotlinInt

doesn't work

as! NSNumber

doesn' work In all non-generic contexts the value is represented as

Int32

. I also can't cast it to a protocol in case it implements an interface 😕

Timothy Wong

05/29/2019, 5:53 AM

Hi all, can someone point me in the right direction for compiling for Raspberry Pi from other Linux Distributions? Thank you. Edit: I am hoping to do it via the gradle multiplatform kotlin native build architecture

Timothy Wong

05/29/2019, 6:52 AM

I am using the echoserver raspberry pi example for reference, and grade is living me an error that 'MPPTools' doesnt exist

victor herasme perez

05/29/2019, 10:15 AM

Hello. I have recently bought a book on NDK and I found that most of it teaches you to use JNI with your Java/ Kotlin code. I wonder if a better approach would be to use Kotlin native

Timothy Wong

05/29/2019, 11:23 AM

Hi all once more, my apologies for the abudance of questions, I am quite new to this technology, and as a project I am hoping to port a few simple things I made in C into Kotlin/Native. The biggest problem is that it is not easy to compile Kotlin Native on a raspberry pi, it took me a really long time to compile a simple hello world application! I do though, want to access the WiringPi library, which allows you to work with the GPIO pins on raspberry pi's. The library is already installed on Raspberry Pi's, and unfortunately the creator does not distribute static files, and only the .so files which can be only installed on a raspberry pi, from what i've been able to research. My question is, if I want to use the library's functionality within a Kotlin Native project, I know that I would have to use it as a dynamic library, but how would I go about linking it to my project? Would that be possible, or would I have to stick to waiting for a long time while it compiles on the raspberry pi. I also thought of the idea of copying the .so files from the raspberry pi into my workspace on my mac computer, and linking it through that way. I'm not sure whether this would work or not, and I would like to know what is the best course of action I should take, or just stick to C and not attempt this

tylerwilson

05/29/2019, 2:07 PM

I need a smidge of help. I am porting some ObjC code to Kotlin Native. It is just a few lines that call into CoreCrypto. Fortunately, I see everything wrapped already, which is great. The original code is like so:

CCHmacContext context;
CCHmacInit(&context, algorithm, keyCString, strlen(keyCString));

I am unclear on how to create the context and pass in the Kotlin version. The first context param is declared as CValuesRef<CCHmacContext>? So how do I construct this CValuesRef type? Thank you. Any similar code would be cool too.

caffeine

05/29/2019, 3:23 PM

Hello. I have gradle multimodule project. I have the project

:ssl

, and he needs

-lssl

for linking. This project builds normally with linkOpts

-lssl

Also, I have

:httpServer

project. Then I add

:ssl

as a dependency to

:httpServer

and after I try to build it. On linking I catching errors they say that argument

-lssl

is not added tp linkOpts. What I must do to fix this error. For example, I can add

-lssl

:httpServer

but I don't want to do this, because I already added this arg to

:ssl

. I don't want to add

-lssl

to each project who using

:ssl

and

:httpServer

Title

caffeine

05/29/2019, 3:23 PM

Hello. I have gradle multimodule project. I have the project

:ssl

, and he needs

-lssl

for linking. This project builds normally with linkOpts

-lssl

Also, I have

:httpServer

project. Then I add

:ssl

as a dependency to

:httpServer

and after I try to build it. On linking I catching errors they say that argument

-lssl

is not added tp linkOpts. What I must do to fix this error. For example, I can add

-lssl

:httpServer

but I don't want to do this, because I already added this arg to

:ssl

. I don't want to add

-lssl

to each project who using

:ssl

and

:httpServer

Dominaezzz

05/29/2019, 3:53 PM

Did you add that in the def file or via gradle?

You'll have to do it via the def file if you want your dependencies to not have to add it.

caffeine

05/29/2019, 6:39 PM

I added -lssl into gradle. Now I try to move this to def file and build my

:httpServer

. As result

httpServer

can't find

*.a

files because this

*.a

not a part of embedded mingw. When I build

:ssl

I added custom path to

*.a

files

Dominaezzz

05/29/2019, 6:40 PM

Did you add the custom path via gradle? Or the def file.

You could always just bundle the

*.a

files and forget about linking altogether.

caffeine

05/29/2019, 6:41 PM

This custom path in project directory. I can't define relative path in def file.

You could always just bundle the
*.a
files and forget about linking altogether.

how?

Dominaezzz

05/29/2019, 6:42 PM

https://github.com/JetBrains/kotlin-native/blob/master/INTEROP.md#including-static-library-in-your-klib

Although you'll have the same relative path issue.

You can specify a path relative to your project directory. That's what the def file uses by default (....ish).

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