My team has a shared kotlin library between an android and an iOS app called

presentation

. We are migrating usage of it from the xcode buildscripts method to instead use cocoapods. We’re getting an unclear gradle error when building from xcode, and aren’t sure how to fix it. Any help would be appreciated:

* What went wrong:
Task 'Debug' not found in project ':presentation'.

i have a set of ported C testcases for linux which have been built as gradle

binaries{executable {...}}

and I found the legend in the Multiplatform doc that says

binaries{test{...}}

will perform a "test executable". Has anyone used this? That seems to be where the documentation trail drops off a steep cliff. so what i did was to

mv

said kt files from

LinuxX86Main

to

LinuxX86Test

, though i've noticed the results are not supported in intellij gradle dialog to say the very least. When gradle runs testallLinuxX64 it doesn't appear to know or mind not knowing where the native test executables are and how to run them, but it completes successfully. when a given entry of the test executables is linked, they link do consume some cpu fan and cycles. How does one run "test executables" from gradle?

How do I use cinterop on windows?

headers = Python.h
package = python
compilerOpts.windows = /I 'C:\\Program Files\\Python39\\Include'

# ignore this one, it's autogenerated from python sysconfig
compilerOpts.linux = -I'C:\\Program Files\\Python39\\Include'
linkerOpts.linux = -L/usr/lib -l python3

---

struct KtPyObject {
    PyObject base;
    void* ktObject;
};

I tried this but I get

Exception in thread "main" java.lang.Error: C:\Users\martm\AppData\Local\Temp\1630593588999760275.c:1:10: fatal error: 'Python.h' file not found
	at org.jetbrains.kotlin.native.interop.indexer.UtilsKt.ensureNoCompileErrors(Utils.kt:192)
	at org.jetbrains.kotlin.native.interop.indexer.IndexerKt.indexDeclarations(Indexer.kt:1189)
	at org.jetbrains.kotlin.native.interop.indexer.IndexerKt.buildNativeIndexImpl(Indexer.kt:1178)
	at org.jetbrains.kotlin.native.interop.indexer.IndexerKt.buildNativeIndexImpl(Indexer.kt:1174)
	at org.jetbrains.kotlin.native.interop.gen.jvm.DefaultPlugin.buildNativeIndex(Plugins.kt:31)
	at org.jetbrains.kotlin.native.interop.gen.jvm.MainKt.processCLib(main.kt:272)
	at org.jetbrains.kotlin.native.interop.gen.jvm.MainKt.interop(main.kt:76)
	at org.jetbrains.kotlin.cli.utilities.InteropCompilerKt.invokeInterop(InteropCompiler.kt:45)
	at org.jetbrains.kotlin.cli.utilities.MainKt.mainImpl(main.kt:38)
	at org.jetbrains.kotlin.cli.utilities.MainKt.main(main.kt:60)

Hi! I'm following this tutorial for beginner: https://kotlinlang.org/docs/native-get-started.html#count-the-unique-letters-in-your-name Everything works exactly as mentioned in that but one thing bothers me -- it doens't run automatically when I run

./gradlew runDebugExecutableNative

or

./gradlew runReleaseExecutableNative

. My IntelliJ just make a build binaries and said its job done. On the contrary, in the guide, it looks like the program is running when that commands initiated. So I wonder why my program doesn't work like that. I'm using macOS m1 (aarch64) v12.0.1, Kotlin v1.6.10 and Intellij v2021.3

Is there any kotlin code generation solution for native? KotlinPoet does not seem to support native target.

Hi 👋 has anyone tried this new linker https://github.com/rui314/mold? It might maybe solve the linker speed problems (because the compilation is now quite fast, however the linking is terribly slow 🐢).

Can anyone please help with the following issue coming with sqldelight

Execution failed for task ':compileSqlDriverNativeMainKotlinMetadata'
w: library included more than once: /Users/rahulrawat/.konan/kotlin-native-prebuilt-macos-x86_64-1.5.31/klib/common/stdlib
w: Could not find "co.touchlab:sqliter-driver-cinterop-sqlite3" in [/Users/rahulrawat/Desktop/Projects/kmp/AddressLibrary, /Users/rahulrawat/.konan/klib, /Users/rahulrawat/.konan/kotlin-native-prebuilt-macos-x86_64-1.5.31/klib/common, /Users/rahulrawat/.konan/kotlin-native-prebuilt-macos-x86_64-1.5.31/klib/platform/ios_arm64]

Tried reverting to 1.5.2 of sqlDelight and kotlin 1.5 but nothing seems to be working.

got a couple steps further (see PR comments); now

/usr/lib/x86_64-linux-gnu/libtinfo.so: error: undefined reference to 'stat', version 'GLIBC_2.33'

is there a list of system dependencies that need to be installed anywhere?

Is there any difference between a .lib file msvc expects and a .a file generated by kotlin/native?

Has someone already the new memory model in production use? From the introduction I was kind of blown off to use it (report if performance is >5x worse) I did a benchmark on one of our data intensive flows and actually its faster with the new memory model (6seconds -> 4seconds). Is there info on which code paths are expected to be slower?

Noticed one case where the new MM has some problems, string allocation. In one of my projects I am developing an Embedded GUI application. It was discovered that if

lv_dropdown_set_options

( https://docs.lvgl.io/8.0/widgets/core/dropdown.html?highlight=lv_dropdown_set_options#_CPPv423lv_dropdown_set_optionsP8lv_obj_tPKc ) is used instead of the

lv_dropdown_set_options_static

( https://docs.lvgl.io/8.0/widgets/core/dropdown.html?highlight=lv_dropdown_set_options_static#_CPPv430lv_dropdown_set_options_staticP8lv_obj_tPKc ) function then the reserved memory usage increases by about 400 KB, ouch! 🩹 . This is the string literal that is passed through to the function:

"Male\nFemale\nOther"

Would be very cool 🐕 to run K/N code in Kotlin Playground ( https://play.kotlinlang.org/ ) if that feature was available.

Hey I’m wondering what it would mean for a multi-module project where one of the modules has

kotlin.native.binary.memoryModel=experimental

and not the other ones? Would that even make any sense?

Is there an example somewhere of how to add integration tests to a simple Kotlin/Native project targeting a single platform? The various Gradle incantations I've found won't compile and I don't know how to adapt them. • Seemingly almost applicable example for JVM: https://kotlinlang.org/docs/mpp-configure-compilations.html#create-a-custom-compilation • Another seemingly almost applicable example for JVM: https://docs.gradle.org/current/userguide/java_testing.html#sec:configuring_java_integration_tests

[Fixed] I’m trying to use the mobile-ffmpeg-full pod in a Kotlin/Native project, but it always says that it can’t find the mobile_ffmpeg_full module. I saw the YouTrak ticket saying that K/N replaces dashes with underscores, but looking at the podspec for this library, the author didn’t override the name with one using underscores.

Hi Can you help me? I have this code in common

expect class ContextRef

then I try implement this code for linux_x64:

actual typealias ContextRef = LLVMContextRef

in this case i got error because

LLVMContextRef

is alias:

public typealias LLVMContextRef = kotlinx.cinterop.CPointer<cnames.structs.LLVMOpaqueContext>

okey, it is fine, I forgot about that thing. I try to change my code to

actual typealias ContextRef = kotlinx.cinterop.CPointer<cnames.structs.LLVMOpaqueContext>

And i got suddenly error:

Type arguments in the right-hand side of actual type alias should be its type parameters in the same order, e.g. 'actual typealias Foo<A, B> = Bar<A, B>'

Why it happend? Why it work fine without

expect

and

actual

? How I can fix it?

This may be a stupid question, but I noticed in one of my projects that when I added cinterop to my targets like below, the run tasks for native disappeared. I’m having to run the link task to build the executable and run it manually. Is there something I’m doing wrong? Here is how I’m configuring my target

binaries {
    executable()
}
val mainCompile = compilations["main"]
mainCompile.cinterops {
    val gtk3 by creating
    val ffmpeg by creating
}
mainCompile.enableEndorsedLibs = true

Is it possible to hook into an objc observer using Kotlin? I need to observe the % of a download task and route it’s current value to a Flow. Can’t seem to find out how to do it.

hi there 👋 i’m playing around kotlin-native compilation for a kts (script), but getting weird exceptions from kotlinc-native so far:

# docker run --rm -it --volume $(pwd):/tool --workdir="/tool" --entrypoint sh adoptopenjdk/openjdk11

# get the kotlin-native cli pack
apt-get update && apt-get install wget 
wget <https://github.com/JetBrains/kotlin/releases/download/v1.6.10/kotlin-native-linux-x86_64-1.6.10.tar.gz> && \
tar -xvzf kotlin-native-*.tar.gz && \
rm *.tar.gz && \
mv kotlin-native-* kotlin-native

# test.main.kts only has one line:
# println("Hello from script!")

# compile with kotlinc-native
kotlin-native/bin/kotlinc-native -script test.main.kts -o test

results:

* Source files: test.main.kts
 * Compiler version info: Konan: 1.6.10 / Kotlin: 1.6.10
 * Output kind: PROGRAM

exception: org.jetbrains.kotlin.util.KotlinFrontEndException: Front-end Internal error: Failed to analyze declaration Test_main
File being compiled: (1,1) in /tool/test.main.kts
The root cause org.jetbrains.kotlin.resolve.lazy.NoDescriptorForDeclarationException was thrown at: org.jetbrains.kotlin.resolve.lazy.BasicAbsentDescriptorHandler.diagnoseDescriptorNotFound(AbsentDescriptorHandler.kt:18)

...
Caused by: org.jetbrains.kotlin.resolve.lazy.NoDescriptorForDeclarationException: Descriptor wasn't found for declaration SCRIPT

it should be possible to compile script to native, right? Thanks in advance for any feedback!

I just moved my old project to the new 

embedAndSignAppleFrameworkForXcode

approach, and now code completion isn’t working for us in xcode for any code from our framework. Where should I be looking to fix this?

Silly question, for people with KMM/iOS experience here. What is the best way to switch over kotlin sealed classes on iOS (if at all)?

data class Payload(val name: String)

sealed class Event {
   
    class Inserted(val payload: Payload) : Event()
    
    class Updated(val payload: Payload) : Event()
    
    class UpdatedAll(val payloads: List<Payload>, val flag: Boolean) :
        Event()
}

What is the best way to dig into OOM crashes with Kotlin/native?

Out Of Memory: The app was likely terminated by the operating system while in the foreground

0 unknown file unknown method

I’m seeing the following error after running a video player in production for only an hour or so.

I guess the incremental compilation doesn’t work for native builds. If I change any single source file, then Android Studio takes very short time to

build

the app. However, the

run

button currently takes about 3 minutes after any single change, and about 3 seconds if no changes were made. Executing this:

./gradlew compileKotlinIosX64 --parallel --build-cache -i

Shows that there is a call to:

Run tool: "konanc" with args: -g -ea -target ios_x64 -p library -o <...>

with tens of source files as arguments (every source file, not just modified one) Is there any possibility to prevent rebuilding

shared.klib

from scratch every time?

Does anyone know how to use

CGDisplayMode

from macos CoreGraphics in Kotlin (1.6.10)? In particular, I can’t make the following code work:

fun main() {
    val displayModes = CGDisplayCopyAllDisplayModes(1, null)!!.toNsArray()
    val displayMode = displayModes.objectAtIndex(0)
    println(displayMode) // prints <CGDisplayMode 0x600003648840> [{ BitsPerPixel = 32; ... }]
    println(displayMode as? CGDisplayMode) // compilation error: java.lang.IllegalStateException: class CGDisplayMode... long stacktrace
    println(displayMode as? CGDisplayModeRef) // prints null
    println((displayMode as? NSObject)?.className) // prints __NSCFType
}

private fun CFArrayRef.toNsArray() = CFBridgingRelease(this) as NSArray

Are there plans for a built-in function to handle Objective-C selectors from K/N? I spent longer than I’d like to admit setting up a class and getting the string exactly right for NSSelectorFromString.

Encountering a strange issue where the CPU on the target device (Raspberry Pi 4) is maxed out when the button is tapped on rapidly (wondering if an issue has been encountered with the new K/N memory model):

Hi, I'm new to kotlin-native and trying to understand if I'm able to interact with a DLL on a windows environment. To understand if it is possible (it seems so) I've built curl from source (to get a sample DLL, I'm going to work with a different one on the actual project) and linked it in my project following what is done on ktor-client-curl. Something seems to work as I am able to build the project and some klibs (e.g. http-client-cinterop-libcurl.klib) are generated. Build starts failing when i try to call some method from the DLL, for example in my main method I call:

curl_easy_init()

When this line is added I get this error on build:

The C:\Users\Francesco\.konan\dependencies\llvm-11.1.0-windows-x64-essentials/bin/clang++ command returned non-zero exit code: 1.
output:
lld: error: unable to find library -lcurl
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

This is my libcurl.def:

package = libcurl
headers = curl.h
headerFilter = *
linkerOpts.mingw_x64 = -LC:/msys64/mingw64/lib -LC:/Tools/msys64/mingw64/lib -lcurl -L/opt/homebrew/opt/curl/include/curl
compilerOpts.mingw_x64 = -IC:/msys64/mingw64/include/curl -IC:/Tools/msys64/mingw64/include/curl

Please let me know if someone has some clues on how to get it working or if I can provide more information. Thanks. This is a repo with my current project: https://github.com/francescopedronomnys/kotlin-native-libcurl-dll Something that I find strange is that this is part of libcurl.def as defined on ktor-client-curl:

linkerOpts.mingw_x64 = -LC:/msys64/mingw64/lib -LC:/Tools/msys64/mingw64/lib -LC:/Tools/msys2/mingw64/lib -lcurl -L/opt/homebrew/opt/curl/include/curl
compilerOpts.mingw_x64 = -I/usr/include/curl -I/usr/include/x86_64-linux-gnu/curl -I/opt/homebrew/opt/curl/include/curl

I do not understand if those paths on

compilerOpts.mingw_x64

are correct or just a copy/paste error, to me they don't look like Windows paths and so on my libcurl.def I've set the path where curl's dll, lib and headers are (

C:/Tools/msys64/mingw64

)

Hi can I have the same variable name in a class and its sub-inner class, and be able to call it in that inner class?

class A {
   var x = 5
   
   inner class B {
       val x = "upper-class".x 
   }
}

I have a Kotlin Native application. It compiles to

mingwX64

and

macosX64

. It also uses a library via cinterop that works with Mac and Windows, and shares the same header files. The problem is that in my project, the library ONLY seems accessible in the mingwX64 or the macosX64 source set. Creating expect/actuals for every single type would be extremely cumbersome. I have

kotlin.mpp.enableGranularSourceSetsMetadata=true

. Something tells me this is supposed to work, but I’ve just done something wrong. Should this be working?

Hi everyone! Please can anyone recommend a good kotlin course? That covers key concepts like concurrency, data structures and algorithms, etc