Is there a way to pass a kotlin vararg to a variadic C function? I'm trying to pass through a printf-style log callback to

snprintf

to do the actual formatting but I've been unable to find a way to do it. At this point I'm thinking of trying a convoluted approach of writing a C method that I can pass as the initial callback that will do the snprintf in C code, then callback into my kotlin code with the final string.

Hi. I have a project with multiple modules in my project. I have a ‘core’ module, and ‘feature’ modules. The core module initializes a Singleton ‘object’ that is later being consumed by the ‘feature’ module(works as expected for Android) .However,I have noticed that the singleton object is being instantiated twice in iOS. when I looked deeper into this, I noticed that because both of the pods (core, and feature) were added to the iOS app, the ‘core’ module is being added twice(?) - once by the pod itself, and once again by the ‘feature’ module that is dependent on the ‘core’ module in KMM. Is there a way of dealing with this? How can I share information between modules if this is indeed a limitation? I can try to share data by writing to a db of some sort, but is this really the only option?

why can’t we add a constructor to a object class{}?

I noticed that all entries in

timespec

are of type

<http://kotlin.Int|kotlin.Int>

for

watchosArm64

target,

__darwin_time_t

is also defined as

<http://kotlin.Int|kotlin.Int>

. Is it by design? Shouldn't it be

kotlin.Long

?

Hey guys, I'm trying to run the example iOS websocket code from Kotlin docs' example in my

iosTest

(unit tests), but everything is just stuck. I saw this comment in a very old thread, and I'm thinking maybe it's the same "queue is not run" problem. Is there anyway for me to run this queue within an iOS unit test? I'm writing a multiplatform library so I don't have an iOS app project. It looks like I don't have access to

NSApplication

there.

Would be nice if there was a way to solve the problem of doing Kotlin Native development in an isolated environment without affecting the host's system environment 😄. Recently I have run into that problem when trying to use the EFL library ( https://en.wikipedia.org/wiki/Enlightenment_Foundation_Libraries ) in a Kotlin Native project ( https://gitlab.com/napperley/efl-hello ). I want to use the latest stable version of EFL (the libefl-all-dev Debian Package is missing key header/library files that should be present), however that is very likely to screw up the host system environment 😦. Building EFL from source for a Linux host requires satisfying a gazillion different dependencies 😱. Sadly a Kotlin Native developer, "cannot make their cake and eat it", this is why we can't have nice things 😦. From the suggestions made from some Kotlin team members in the past ( https://youtrack.jetbrains.com/issue/KT-43501 ) on linking C libraries I don't think any of them use a Linux PC on a regular basis for Software Development; "It takes one to walk in ones shoes" in order to understand the issues they face, and how they do things.

How do you get more details from failing K2Native compiler, eg by providing arguments to the compiler (with gradle)? I am getting this error message and would like to find the root cause/file:

e: Compilation failed: Symbol for public platform.Foundation/NSCopyingProtocol|null[100] is unbound

 * Source files: 
 * Compiler version info: Konan: 1.5.30 / Kotlin: 1.5.30
 * Output kind: FRAMEWORK

Have the Kotlin team looked at setting up a Linux Device Lab for testing Kotlin Native on a wide range of different Linux/Embedded Linux based devices?

Hey friends! Is anyone using the Cocoapods Gradle plugin for debugging/iteration, but then a versioned/hosted private pod for "normal" iOS development? If so, how do you toggle between the two? Any tricky bits to watch out for? Context: We're currently only publishing our KMP XCFramework as a private pod, which we've automated through Gradle, but is still slow for iterative work. Our iOS devs are interested in being able to debug faster with the cocoapods gradle plugin when they're iterating in KMP code, but they're also hesitant to link the iOS and KMP projects for everyday work because their build times are already slow enough as it is.

Hey everybody, is there a way to pass a nullable primitive pointer to a Kotlin function? Context: I'm trying to pass a Kotlin function to a C library as a callback and it needs to accept a nullable primitive pointer as an argument. More info in thread.

Running into a cinterop issue.

typedef struct

produces a kotlin definition with package

cnames.structs

. I don't think it's possible to change the package used, or I can't find a way in the docs. It works OK on linux, but we have a name collision with a darwin platform struct. It doesn't make a lot of sense to me. They have the same name, but when I navigate to the type in the IDE, the darwin platform type has a different package. In our code, we import `import cnames.structs.JSContext`and that works for target

linuxX64

but not for

iosX64

(

macosX64

, etc). Any quick thoughts before I start deep diving? Thanks in advance...

I’m trying to bridge a C++ library to Kotlin/Native by creating a C intermediary. The c++ project is compiled using gradle’s 

cpp-library

. Unfortunately it seems that this grade plugin doesn’t support mixed C/C++ sourcesets for compilation. So, does Kotlin cintertop work when a header file doesn’t use any C++ features, but the implementation is in C++? Is it even possible to implement a C header files with C++? I’m a total C++ noob. Any help is appreciated 🙂

Found something that was a very alarming, and hopefully a member of the Kotlin Team can provide a good explanation why the RAM usage is high. I have two different versions of a Kotlin Native program, one targeting linuxX64, and the other targeting linuxArm32Hfp. The linuxX64 version uses significantly less RAM (at 6.9 MB) than the linuxArm32Hfp version (at 23 MB) 😱. The linuxArm32Hfp version uses over three times the amount of RAM that the linuxX64 version uses which is cause for huge concern. Originally when I saw something similar occurring (with a different Kotlin Native program) I thought I must have made some major mistakes when developing the Kotlin Native program, however the pattern that is emerging suggests otherwise.

Hi, i have a small problem when using objectivec interop def files. When i include

#import <Foundation/NSBundle.h>

im getting the following error

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator15.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSBundle.h:91:143: error: function does not return NSString

i couldn't find anything that would explain this error. The error is also happening when i include

#import <Foundation/Foundation.h>

or

#import <UIKit/UIView.h>

since that all includes all foundation headers internally.

Hi! I have this error when trying to compile my program. My program uses a bigger self-made multiplatform project which uses Ktor and Korio. Mabye there is a problem. Error:

C:\Users\jan\.konan\dependencies\msys2-mingw-w64-x86_64-clang-llvm-lld-compiler_rt-8.0.1\bin\ld: cannot find -lcurl

The cinterop tool isn't generating the proper mappings for the String Share APIs ( https://www.enlightenment.org/develop/guides/c/eina/strings.md ) that are part of the EFL library. For example the

eina_stringshare_replace

function should accept a CPointer<Eina_StringshareVar>? as the first parameter. Instead the function only accepts a CValuesRef<CPointerVar<Eina_StringshareVar>>? as the first parameter.

How do I free a piece of memory which has it’s own custom free function written in C and its lifetime is tied to the lifetime of a K/N object? I don’t think

memScope

would work for this, but I’m unsure

Can someone point me in the right direction in debugging issues like this while compiling:

e: Compilation failed: Symbol for public com.example/Example.stuff.<get-stuff>|-6269057140886526916[0] is unbound

Has anyone shared a module that uses kotlinx.serialization to iOS? Even if I use implementation() in my build.gradle, it still exposes Decoder on my header file, like so:

__attribute__((swift_name("Decoder")))
@protocol CommonDecoder
 (BOOL)decodeBoolean __attribute__((swift_name("decodeBoolean()")));
- (int8_t)decodeByte __attribute__((swift_name("decodeByte()")));
- (unichar)decodeChar __attribute__((swift_name("decodeChar()")));
- (double)decodeDouble __attribute__((swift_name("decodeDouble()")));
...
@end;

this causes import issues with Swift.Decoder and Swift.Encoder. How can I change the swift_name of this class that I dont own?

Has anyone had a crash on iOS of type terminateWithIllegalSharingException? I’m trying to insert a simple object from main thread to sqldelight using native-mt.

Is there anything theoretically preventing someone from writing KN <-> Objective-C bindings to Skia and using them to render UI's on iOS? It seems like someone could do this and finish off the "Kotlin UI everywhere" story -- write once using a single UI toolkit and render on Desktop/Web/Mobile.

What is the reason that

typedef struct Foo Foo;

winds up as

cnames.structs.Foo

whereas

typedef struct Foo { ... } Foo;

goes into

my.package.Foo

? I'm running into simple name collisions in

cnames.structs

which are causing compilation failures only on some native targets.

Trying 1.6.0-M1. It looks like windows is being built on mac now? At least I see the mingwX64 folder. I may have missed that.

How do I use a git repository (kotlin-native) as a dependency?

And how would I go about using a library like Skia, which is awful to set up in gradle?

For the latter I looked at skiko, but the only native bindings available seem to be for macOS and not common native code.

I wonder if anyone has any clue as to why androidNative executables don't work. I have a hello world executable that segfaults. Android logcat shows

2021-10-04 21:47:44.065 0-0/? I/playground2.so[20392]: segfault at 0 ip 00000000f52ce047 sp 00000000ffe03130 error 6 in playground2.so[f52ce000+143000]
2021-10-04 21:47:44.068 0-0/? I/Code: 00 00 00 d8 3e 2d 00 00 00 00 00 34 00 20 00 08 00 28 00 28 00 27 00 06 00 00 00 34 00 00 00 34 00 00 00 34 00 00 00 00 01 00 <00> 00 01 00 00 04 00 00 00 04 00 00 00 01 00 00 00 00 00 00 00 00

I'm not experienced in native development, but none of my attempts led anywhere - addr2line gives ??, malloc debugging (here) does nothing. I managed to get a linux core dump and fed it to lldb, but I'm not able to get any information from it. The same code works perfectly when compiled as a shared library. Any clue on how to dig deeper before filing an issue?

I’m getting an error when Kotlin cocoa pods is using cinterop.

An operation is not implemented: support enum forward declarations: enum AEPLogLevel

. What can we do?

When my tests fail in a background thread, it doesn't show the exception message, just

Test running process exited unexpectedly.

and the stacktrace. Is it possible to install an uncaught exception handler in a native thread?