👋 Since using KMM to compile a shared module, my XCFramework size has ballooned from 13 to 99 MB. I know that on the Android side we have R8 and progaurd to minify and remove unused code from dependencies. Does anything like that exist on the iOS/Mac side? Or what tools are available to prune the size of the KMM objc frameworks?

Does String.hashCode return the same value on JVM and native? It seems that both use the same polynomial hash implementation. Maybe it was a conscious design decision and one could rely on it?

Hello guys, i am calling suspend function on ios, and is getting the following error,

*Calling Kotlin suspend functions from Swift/Objective-C is currently supported only on main thread*

any clue

Which performance metrics would be relevant to a K/N program (that targets Linux for example) that uses the new K/N memory model?

Hey guys! 😊 Do you know how I can compile a

kotlinx

library like

kotlinx-datetime

for LinuxArm64 and use it in my project? 🤔

On the off-chance that someone has used directx 11 with kotlin native and mingw for windows, can anyone spot any specific reason to why the following code would not run, given that the ID3D11Device is setup correctly:

pacman -S mingw-w64-x86_64-headers-git

directx.def
=======================
package = directx
headers = windows.h windowsx.h stdint.h d3dcommon.h d3d11.h winuser.h dxgi.h
headerFilter = windows.h windowsx.h stdint.h d3dcommon.h d3d11.h winuser.h dxgi.h
libraryPaths = C:/msys64/mingw64/x86_64-w64-mingw32/lib C:/msys64/mingw64/lib
linkerOpts =  -LC:/msys64/mingw64/lib -LC:/msys64/mingw64/x86_64-w64-mingw32/lib -ldxguid -ld3d11 -ldxgi -lstdc++ -DUNICODE
compilerOpts = -LC:/msys64/mingw64/lib -LC:/msys64/mingw64/x86_64-w64-mingw32/lib -ldxguid -ld3d11 -ldxgi -lstdc++ -DUNICODE
---

Problematic code:
        val dxgiDevice: IDXGIDevice = alloc()
        println("Device instance: ${D3DDevice.ptr}")
        val vtable = D3DDevice.lpVtbl?.pointed
        println("Trying to make use of virtual table... P: $vtable")
        hr = vtable?.QueryInterface?.invoke(D3DDevice.ptr, IID_IDXGIDevice.ptr, dxgiDevice.ptr.pointed.reinterpret()) ?: 0
        println("3")
        if(FAILED(hr)){
            MessageBoxA(null ,"D3DDevice->QueryInterface failed", null, 0)
        }else{
            println("D3DDevice->QueryInterface success!")
        }

We never reach println("3"), and I'm not getting any exception reasons or missing imports

Any one worked here on kotlin-native kotlin bindings for C/C++ calls? we are seeing return value from C/C++ as null.

Are there any examples Kotlin native drawing a simple UI in windows or Mac? I was contemplating using Kotlin native as an app that downloads the rest of the app which is much larger. I just need to display some text and a progress bar in Mac and windows UI.

Does anyone know where I can find the source code or documentation about platform libraries, e.g. platform.Foundation.*? I downloaded Kotlin toolchain on Mac, and it seems klib/platform/$target folder contains lots of platform libraries, however I only found

cstubs.bc

file insider, can not find any kotlin bindings, does anyone know how to get kotlin bindings for those platform libraries?

Like any programmer, I’m too lazy to go check the charging status of my car, so I’d like to spend time programming a microcontroller to send data it gets from CANBus over LoRa to my desktop, where it can be processed and sent to my phone. Normally, I’d reach for a RasPi pico and Rust, but I’d like to use Kotlin this time. Is zephyr support good enough that I could buy a disco board, or should I go for a RasPi zero and run Kotlin on embedded Linux? I’m a bit concerned about power consumption if I go full embedded Linux.

How can I get the offset of a variable of a struct in Kotlin? In objective C there is a offsetof(struct, elem) function. Can I access that from Kotlin?

Hi all! I'm sorry if this questions have already been asked, but I might not use the right search terms... I don't know what I am configuring wrongly but I am failing to have to get filenames and line numbers in my Kotlin/Native stacktraces. (I give an example stacktrace in the thread.) Also, when executing tests with Kotest (might be an issue with Kotest though). You can also see this in CI builds (e.g. https://github.com/ptitjes/kzmq/runs/7826776961?check_suite_focus=true#step:6:418) where filenames are

null

and line numbers are `-1`:

DealerRouterTests.base (cio, cio) FAILED
    kotlinx.coroutines.TimeoutCancellationException at null:-1

The said stacktrace is produced while running native tests of Kzmq. Note that this project consists of multiple sub-projects (

:kzmq-core

,

:kzmq-cio

, ...) and the tests are located in their own sub-project (

:kzmq-tests

).

i tried to enable libbacktrace via

kotlin.native.binary.sourceInfoType=libbacktrace

and it seems to work locally fine on

macosArm64

, but when crosscompiling to

mingw64

as usual.. stuff starts to break down, both on my macbook and ubuntu CI runner i get

e: /Users/nikky/.konan/dependencies/apple-llvm-20200714-macos-aarch64-essentials/bin/clang++ invocation reported errors

The /Users/nikky/.konan/dependencies/apple-llvm-20200714-macos-aarch64-essentials/bin/clang++ command returned non-zero exit code: 1.
output:
lld-link: error: undefined symbol: Kotlin_getSourceInfo_libbacktrace
>>> referenced by /var/folders/wp/xphwwgsj3zg4w61bkrh4sdvm0000gn/T/konan_temp18158004099953611372/result.o:(Kotlin_getSourceInfo_Function)
clang-11: error: linker command failed with exit code 1 (use -v to see invocation)

FAILURE: Build failed with an exception.

does anyone know what package i might need to install ? or how to configure libbacktrace only for linux and macos targets ?

We’re running into a strange issue in release iOS builds with the new memory model. Doesn’t happen in debug builds. When a user opens/closes a particular screen multiple times, on the ~12th try, we trigger the GC, and it crashes the app. The stracktrace looks something like:

Crashed: GC thread
0  QuizletSharedKotlin            0x919294 std::__1::invoke_result<kotlin::gc::ConcurrentMarkAndSweep::ConcurrentMarkAndSweep(kotlin::mm::ObjectFactory<kotlin::gc::ConcurrentMarkAndSweep>&, kotlin::gc::GCScheduler&)::$_2>::type kotlin::ScopedThread::Run<kotlin::gc::ConcurrentMarkAndSweep::ConcurrentMarkAndSweep(kotlin::mm::ObjectFactory<kotlin::gc::ConcurrentMarkAndSweep>&, kotlin::gc::GCScheduler&)::$_2>(kotlin::ScopedThread::attributes, kotlin::gc::ConcurrentMarkAndSweep::ConcurrentMarkAndSweep(kotlin::mm::ObjectFactory<kotlin::gc::ConcurrentMarkAndSweep>&, kotlin::gc::GCScheduler&)::$_2&&) + 1292
1  QuizletSharedKotlin            0x91a214 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(kotlin::ScopedThread::attributes, kotlin::gc::ConcurrentMarkAndSweep::ConcurrentMarkAndSweep(kotlin::mm::ObjectFactory<kotlin::gc::ConcurrentMarkAndSweep>&, kotlin::gc::GCScheduler&)::$_2&&), kotlin::ScopedThread::attributes, kotlin::gc::ConcurrentMarkAndSweep::ConcurrentMarkAndSweep(kotlin::mm::ObjectFactory<kotlin::gc::ConcurrentMarkAndSweep>&, kotlin::gc::GCScheduler&)::$_2> >(void*) + 112
2  libsystem_pthread.dylib        0x19ac _pthread_start + 148
3  libsystem_pthread.dylib        0xe68 thread_start + 8

It’s super hard for us to create a minimal reproduction of this, but in case it’s relevant, we’ve been able to repro this with: • Kotlin 1.7.10 and 1.7.20-Beta • SqlDelight 1.5.3 and 2.0.0-alpha03 • kotlinx.coroutines 1.6.4 (without the

-native-mt

suffix) • KMP-NativeCoroutines 0.12.6-new-mm Any tips on how to narrow this down?

On the topic of KMP builds that output a static framework, I have been having a heck of a time when combining the static output with a pulled in pod.

framework {
            baseName = "RedShirt"
            isStatic = true
            embedBitcode(BITCODE)
        }

        pod("xxxxx") {
            moduleName = "xxxx"
        }
        useLibraries()

Using Kotlin

1.7.10

currently, the build goes swimmingly, and it very much seems that everything is in place, removing the pod, drastically impacts the output file size. I am running my output via

podPublishReleaseXCFramework

incase that has any bearing. The issue comes in when importing in XCode. It imports and references everything as expected, but when trying to build it will rarely, and intermittently work. The most common experience is the build failing with

arm64

errors around:

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_UIDevice", referenced from:
      objc-class-ref in RedShirt(result.o)


Showing Recent Messages
Undefined symbol: _OBJC_CLASS_$_UIDevice

This error is not specific to arm, based on the build target. I haven't been able to track down any source on this kind of issue, everything is a brand new empty, and simple project. I don't believe I am missing anything, but this inconsistency is making things difficult.e

Hello, does Kotlin native supports unsigned values? Currently running

Compiler version info: Konan: 1.7.0 / Kotlin: 1.7.20

I am getting these kind of errors

api.cpp:14475:871: error: unknown type name 'libnative_kref_kotlin_UInt'; did you mean 'libnative_kref_kotlin_Int'?
api.cpp:14412:1533: error: unknown type name 'libnative_kref_kotlin_ULong'; did you mean 'libnative_kref_kotlin_Long'?

The documentation seems to say it should be supported.

I want to know how to put the warning of 'magic number' in the ItellJ IDE and what should put in the @suppress() annotation to suppress it

I have an issue with using coroutines on kotlin native. I need to suspend my coroutine until a call to an api is done. However, the call to the api internally executes the code on another thread. Therefore, the following error is thrown:

Uncaught Kotlin exception: kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen kotlinx.coroutines.internal.DispatchedContinuation

runBlocking {
    withContext(Dispatchers.Main) {
        suspendCoroutine { c ->
            //handler is called from another thread.
            val handler = { x -> c.resume(x) }

            //Internally, schedules the work on another thread.
            //Therefore, c.resume() fails, as c is frozen.
            some_api_that_schedules_another_thread(handler)
        }
    }
}

Is there any way around of this. Changing the internal API is not possible.

Greetings! I am trying to call some functions of a Swift only library from Kotlin. I am aware that the only way to do this is to define some wrappers available in Objective-C and then compile it via Kotlin/Native. I started experimenting by creating a static library via Xcode, defining a Gradle task that runs

xcodebuild -workspace MyLibInterop.xcworkspace -scheme MyLibInterop -sdk $sdk -configuration Release build SYMROOT=$PWD/build OBJROOT=$PWD/build

, and finally creating a cinterop configuration via Gradle and a .def file. It works quite well. My setup is very similar to the one explained here: https://medium.com/kodein-koders/create-a-kotlin-multiplatform-library-with-swift-1a818b2dc1b0 (the ChachaPoly one). However I encounter a problem as soon as I start to add dependencies to this static library: I don’t know how to tell cinterop where to look for the dependency frameworks used by the static library. I used Cocoapods (without Gradle) to define the dependencies. The previous

xcodebuild

command then outputs several .framework directories that represent the dependencies in addition to the existing .h and .a files. My exact issue is ``ld: warning: Could not find or use auto-linked framework 'Amplify'` which is one of the .framework directories when running the task

shared:linkPodDebugFrameworkIosArm64

. I suppose that I have to define a recursive framework search path within my Kotlin cinterop configuration (i.e., the .def file). I came across the

-F

and

-framework

linker & compiler options but used them without any success. Thank you in anticipation for any kind of help you will be able to provide me with. I can provide any info or piece of code you need.

I'm trying to use the integrated

embedAndSignAppleFrameworkForXcode

task, but I don't think the task is getting executed from xcode. I've added a run script to the build phases to run the task for my module, but when i build the xcode project, it's failing when trying to link the framework - the path doesn't exist. I can confirm that there's no build folder for the xcode framework in my kmp module. not sure what I'm doing wrong

I'm gettin a '*dyld[20011]: Library not loaded'* error when running my ios app - the framework isn't being found on the rpath. i think the only things i changed since my last successful run as that i added a new framework and added a swift package. I ended up explicitly adding the framework to the 'Frameworks, Libraries, and Embedded Content' section, which works, but is this actually what i want to do? in the kmm-basic-sample the 'shared' framework isn't added in this section, and thing seemed to be working before without adding my framework like this, so i feel like something got messed up. any insight is welcome.

I've managed to get K/N to segfault. How do I print debug info to report this issue?

Hi all! I am trying to use a CI (Github workflows) to build my project Kzmq on macOS and Windows, in addition to the current Linux build. However, I am having problems with my cinterop in one of my modules (kzmq-libzmq). As I don't have any macOS or Windows computer at hand, I can't figure out the correct mix of: • installing the right dependencies (with their 'devel' version, i.e. header files), and • specifying the right include directories. I would be very grateful if some of you could bring me their cinterop wisdom, and even more grateful if they can try to run the build on a macOS or a Windows machine... The variables: • The project's module using cinterop: https://github.com/ptitjes/kzmq/tree/main/kzmq-libzmq/ • The cinterop def file: https://github.com/ptitjes/kzmq/blob/main/kzmq-libzmq/src/nativeInterop/cinterop/libzmq.def • The build file location where I am tweaking the headers' location further: https://github.com/ptitjes/kzmq/blob/main/kzmq-libzmq/build.gradle.kts#L21 • The two places where the cinterop fails by missing `zmq.h`: ◦ macosArm64: https://github.com/ptitjes/kzmq/runs/7962593655?check_suite_focus=true#step:6:713 ◦ mingw64: https://github.com/ptitjes/kzmq/runs/7962593817?check_suite_focus=true#step:6:407 • The packages that I install: ◦ on macos via brew: https://github.com/ptitjes/kzmq/pull/53/files#diff-9a1e47827bb935b60d2d4592090115539aa536c1a1229a6952ddd8384cb02a4c ◦ on windows via pacman: https://github.com/ptitjes/kzmq/pull/53/files#diff-72a5c9cf2c4b3e57d39405e7aa05c07ed44b8d21b0b8fc2a5aa539f56fd41c16 In advance, thanks a lot for your help!! Didier.

Hi all! I’m trying to introduce a rust library to KMP, but I don’t know how to configure ios cinterops, I’ve tried to build an xcode project to verify that the

.h

.a

is working, but currently in KMP it prompts:

Undefined symbols for architecture x86_64:
  "_CTFontGetXHeight", referenced from:
      SkScalerContext_Mac::generateFontMetrics(SkFontMetrics*) in libskia.a(fontmgr_mac_ct.SkScalerContext_mac_ct.o)
  "_CTFontGetUnderlineThickness", referenced from:
      SkScalerContext_Mac::generateFontMetrics(SkFontMetrics*) in libskia.a(fontmgr_mac_ct.SkScalerContext_mac_ct.o)
  "_CTFontGetUnderlinePosition", referenced from:
      SkScalerContext_Mac::generateFontMetrics(SkFontMetrics*) in libskia.a(fontmgr_mac_ct.SkScalerContext_mac_ct.o)
  "_CTFontGetAdvancesForGlyphs", referenced from:
      SkScalerContext_Mac::generateMetrics(SkGlyph*, SkArenaAlloc*) in libskia.a(fontmgr_mac_ct.SkScalerContext_mac_ct.o)
  "_CTFontCreatePathForGlyph", referenced from:
      SkScalerContext_Mac::generateMetrics(SkGlyph*, SkArenaAlloc*) in libskia.a(fontmgr_mac_ct.SkScalerContext_mac_ct.o)
      SkScalerContext_Mac::generatePath(SkGlyph const&, SkPath*) in libskia.a(fontmgr_mac_ct.SkScalerContext_mac_ct.o)
  "_CTFontDrawGlyphs", referenced from:
      SkCTFontGetSmoothBehavior() in libskia.a(libskia.SkCTFont.o)
      SkScalerContext_Mac::Offscreen::getCG(SkScalerContext_Mac const&, SkGlyph const&, unsigned short, unsigned long*, bool) in libskia.a(fontmgr_mac_ct.SkScalerContext_mac_ct.o)
  "_kCTFontVariationAxisMinimumValueKey", referenced from:
      SkCTVariationFromSkFontArguments(__CTFont const*, SkFontArguments const&) in libskia.a(fontmgr_mac_ct.SkTypeface_mac_ct.o)
      SkTypeface_Mac::onGetVariationDesignParameters(SkFontParameters::Variation::Axis*, int) const in libskia.a(fontmgr_mac_ct.SkTypeface_mac_ct.o)
  "_CTFontGetSize", referenced from:
      ...
  "_CTFontGetSymbolicTraits", referenced from:
      create_from_name(char const*, SkFontStyle const&) in libskia.a(fontmgr_mac_ct.SkFontMgr_mac_ct.o)
      SkTypeface_Mac::Make(std::__1::unique_ptr<__CTFont const, SkFunctionWrapper<void (void const*), &(CFRelease)> >, OpszVariation, std::__1::unique_ptr<SkStreamAsset, std::__1::default_delete<SkStreamAsset> >)::$_0::operator()() const in libskia.a(fontmgr_mac_ct.SkTypeface_mac_ct.o)
      SkTypeface_Mac::onGetAdvancedMetrics() const in libskia.a(fontmgr_mac_ct.SkTypeface_mac_ct.o)
  "_kCTFontFamilyNameKey", referenced from:
      SkTypeface_Mac::onCreateFamilyNameIterator() const in libskia.a(fontmgr_mac_ct.SkTypeface_mac_ct.o)
  "_CTFontCollectionCreateMatchingFontDescriptors", referenced from:
      (anonymous namespace)::SkCopyAvailableFontFamilyNames(__CTFontCollection const*) in libskia.a(fontmgr_mac_ct.SkFontMgr_mac_ct.o)
  "_CTFontCopyAttribute", referenced from:
      SkCTFontCreateExactCopy(__CTFont const*, double, OpszVariation) in libskia.a(fontmgr_mac_ct.SkTypeface_mac_ct.o)
      SkTypeface_Mac::onOpenStream(int*) const in libskia.a(fontmgr_mac_ct.SkTypeface_mac_ct.o)
  "_CTFontCreateForString", referenced from:
      SkFontMgr_Mac::onMatchFamilyStyleCharacter(char const*, SkFontStyle const&, char const**, int, int) const in libskia.a(fontmgr_mac_ct.SkFontMgr_mac_ct.o)
ld: symbol(s) not found for architecture x86_64

demo: https://github.com/qdsfdhvh/compose-hellorust

Is it possible to “statically link” cocoapods dependencies? My team wants to avoid introducing a cocoapods build step, but we want to implement some functionality on top of a cocoapods library in KMM. As far as I can tell in the docs, using cocoapods in KMM bubbles up a cocoapods build requirement to the associated iOS build.

When applied, the CocoaPods plugin does the following:

• Creates a

podspec

task which generates a Podspec file for the project.

Without the support of swift package manager as part of the gradle build process, we’re left to use cocoapods or manually install the SDK. We’d prefer not to do this manually if we can avoid it.

Hello, can someone provide me an example of how to configure a project that compiles for multiple architecture? I can’t make sense of the documentation 😅 Inside of

/common

I have

nativeMain

, so

/common/nativeMain

and I’d like this folder to be use for macosX64 and linuxX64. I tried something like this, but it does seem to be it (I am getting KotlinSourceSet not found)

val nativeMain by creating {
            dependsOn(commonMain)
            dependencies {
                implementation(Deps.Ktor.clientCurl)
            }
        }
        val nativeTest by creating {
            dependsOn(commonTest)
        }
        val macosX64 by getting {
            dependsOn(nativeMain)
        }

Hi friends :) I am hoping to make a lifecycle manager for a C library, as I have done before in C++. Is there a clean way to get code to run on scope exit, even if an exception is thrown? I have discovered the

try ... finally

pattern, but I would prefer to not have to create an additional scope to accomplish what I am trying to do.

I'm also wondering: I've had an easy time using `ByteArray`s for C functions which want to accept a

char **

to write to, but what would be the best way to pass, say, an

int *

or any other primitive pointer? I can use

alloc

within

memScoped

, but is there any way to use a variable on the stack rather than the heap?

Hello. Is it known bug in recent versions that when compiling for

mingw

target and using extra precompiled libs from MSYS2 distribution - adding

-Ldir -lfoo

does not work, but adding

dir/libfoo.a

(full path to .a file) - works?