I'm getting a crash in my iOS app, but I have no idea what it means. No stack trace. It's coming from Kotlin native. Anyone seen this?

OS Version:         iOS 14.6

(anonymous namespace)::ExceptionObjHolderImpl: 

0 unknown file unknown method

Question about cinterop. Can this be used to produce bindings in a shared module across many native targets? I have made a little example where I compiled a static library test.a in mingwx64 and then used cinterop in gradle to link the static file and create bindings from the header. That all works. Now let's say I have a sourceSet named nativeMain that other sourceSets like mingwX64Main depend on. How do I reference the generated bindings in that shared sourceSet? Currently I have a kotlin block in my build.gradle.kts configured like so:

mingwX64 {
    this.compilations["main"].cinterops {
        create("test") {
            packageName = "github.fatalcatharsis.test"
            includeDirs.allHeaders(project.rootDir.resolve("headers"))
            extraOpts("-libraryPath", "${project.rootDir}/src/mingwX64Main/resources/", "-staticLibrary", "test.a")
        }
    }
}

sourceSets {
    val commonMain by getting {
        dependencies {
            implementation(kotlin("stdlib-common"))
        }
    }
    val commonTest by getting {
        dependencies {
            implementation(kotlin("test-common"))
            implementation(kotlin("test-annotations-common"))
        }
    }

    val nativeMain by creating {
        dependsOn(commonMain)
    }

    val mingwX64Main by getting {
        dependsOn(nativeMain)
    }
}

Code that I put in src/mingwX64Main/kotlin gets highlighted properly and builds using the definitions in my c header. But nativeMain obviously does not. Is there any way to have the header bindings available to a shared source set?

I’m getting a report in crashlytics with this stacktrace. Crashlytics points

kotlin::FormatToSpan(kotlin::std_support::span<char, 18446744073709551615ul>, char const*, ...) + 4354272500

to be the culprit. I have no Idea how to find what causes this, how should I proceed?

can kotlin-native give me the name of the binary as part of the args in main.. ? i want to use clikt and give the main command the name of the binary so that error and help messages will be correct no matter what the executable was renamed to..

by default, it gives me the following build

val hostOs = System.getProperty("os.name")
    val isMingwX64 = hostOs.startsWith("Windows")
    val nativeTarget = when {
        hostOs == "Mac OS X" -> macosX64("native")
        hostOs == "Linux" -> linuxX64("native")
        isMingwX64 -> mingwX64("native")
        else -> throw GradleException("Host OS is not supported in Kotlin/Native.")
    }
    nativeTarget.apply {
        binaries {
            executable {
                entryPoint = "main"
            }
        }
    }

which works and generates a windows ".exe" file I can also change the first line to a literal

"Linux"

(to pretend I am on a linux) and it works and generates a linux ".kexe" file but I can't figure out how to make it generate both a linux ánd a windows executable

Install the curl library

however, I am a bit confused and annoyed by this step as 1, this shouldnt be necessary, developers shouldnt download and install arbitrary things just to make their machine able to build a project, this is literally what tools like gradle are meant for, why is this not handled by gradle?! 2, the link is just a download page, which gives absolutely no information as to how to "install" (pretending that even makes sense) the package 3, I have curl already "installed"

Hello, When compiling for mac (using

./gradlew linkNative

) I get an error when I return

null

in a function, such as:

// commonMain
interface GetManufacturerUseCase {
    operator fun invoke(): String?
}

// nativeMain
class GetManufacturerUseCaseImpl : GetManufacturerUseCase {
    override fun invoke() = null
}

It produces this error

/var/folders/v4/tsnbm2mj12qcqd5mzx022z0m0000gp/T/konan_temp15915856283221827637/api.cpp:482:21: error: unknown type name 'libNative_kref_kotlin_Nothing'; did you mean 'libNative_kref_kotlin_Long'?
                    libNative_kref_kotlin_Nothing (*invoke)(libNative_kref_com_me_myproject_deviceInfo_domain_usecase_GetManufacturerUseCaseImpl thiz);
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                    libNative_kref_kotlin_Long

To fix it, I return an empty string 😕 But that’s not really what I want. Is this a bug, or a limitation?

Hello everyone, how should I interoperate with C++ in kotlin native? I need to call a library whose header file is C++, the library is a bit huge, so it is unrealistic to manually change it to a C header. In addition, I am a newbie to C/C++, so this question may be a bit stupid.

Hello, Is there a possibility to generate a .dylib (or .so), which uses a header file but don’t include the library? I would like to compile a .dylib that will be used by Unity Engine. So I’ll be using the header file, but not it’s implementation, which will be provided by Unity.

Hi, It is any possibility to do Parameterized Tests in kotlin-test?

I have a Kotlin app with some cocoapods dependencies, I have a

cocoapods

block in my gradle build file. It generates a podspec file. I then reference this podspec file from the Podfile of an XCode project. Now, in a Swift file in the XCode project, I seem to be able to import the dependencies of my app defined in my

cocoapods

block, but not my own Kotlin code. Anyone knows how this is supposed to work?

did anyone manage to compile a Kotlin Native project for linux in a docker container? in my case, the build just keeps failing currently, the error looks like "idunno, something didnt work" to me, so I have no idea how to even approach this

Is there a simple way to pass a Swift

[String]

to a Kotlin function taking an

Array<String>

(exposed to Swift as

KotlinArray<NSString>

)?

Hello, I created a

sourceSet

called

desktopMain

like in this example The problem I'm facing, is that

platform.posix.popen

and

platform.posix.pclose

are not available in the shared

sourceSet

. Any idea why it is not resolved?

Hello, I'm proceeding with my tests using kotlin/native to interact with a DLL on Windows (see thread https://kotlinlang.slack.com/archives/C3SGXARS6/p1642088820036200 and repo https://github.com/francescopedronomnys/kotlin-native-libcurl-dll). I was able to get it working with curl (as libcurl.dll) and I'm now trying to communicate with a different DLL (named libusbtocan.dll), so I've done what it looks like the same configuration on a new project (see the repo https://github.com/francescopedronomnys/kotlin-native-usb2can-dll ) but I cannot get it to compile, this is the error I get:

The C:\Users\Francesco\.konan\dependencies\llvm-11.1.0-windows-x64-essentials/bin/clang++ command returned non-zero exit code: 1.
output:
lld-link: error: undefined symbol: CanalGetDllVersion
>>> referenced by Z:\BuildAgent\work\6326934d18cfe24e\kotlin\libraries\stdlib\src\kotlin\util\Result.kt:0
>>>               C:\Users\FRANCE~1\AppData\Local\Temp\konan_temp5544792713254776830\result.o:(libusbtocan_CanalGetDllVersion_wrapper14)
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

FAILURE: Build failed with an exception.

Idea is able to resolve libusbtocan methods, so it looks like the linker (?) should be able to resolve that symbol. Do you have any hint? Thanks.

For a project I was evaluating starting in Kotlin/Native, I need to compile for targets outside of what K/N currently supports (currently freestanding with no OS). I can handle the LLVM args and cinterop myself, but I was wondering if there's a problem with setting the target to linuxX64 and overriding the clang-args. It looks like K/N needs a cxxabi binary, so I'll have to compile one freestanding and link that. Has anyone else tried this? If I expand to other architectures, such as RISC-V, can I keep the target linuxX64 and override the arch with clang-args?

Encountering an issue where there are some dependency conflicts after running the linkCounterDebugExecutableLinuxX64 Gradle task. Below is the truncated version of the build log:

e: Module "io.gitlab.embed-soft:lvglkt-sdl2 (io.gitlab.embed-soft:lvglkt-sdl2-linuxx64)" has a reference to symbol lvgl/lv_tick_inc|-852571541272050155[100]. Neither the module itself nor its dependencies contain such declaration.

This could happen if the required dependency is missing in the project. Or if there is a dependency of "io.gitlab.embed-soft:lvglkt-sdl2 (io.gitlab.embed-soft:lvglkt-sdl2-linuxx64)" that has a different version in the project than the version that "io.gitlab.embed-soft:lvglkt-sdl2 (io.gitlab.embed-soft:lvglkt-sdl2-linuxx64): 0.3.0" was initially compiled with. Please check that the project configuration is correct and has consistent versions of all required dependencies.

The list of "io.gitlab.embed-soft:lvglkt-sdl2 (io.gitlab.embed-soft:lvglkt-sdl2-linuxx64): 0.3.0" dependencies that may lead to conflicts:
1. "io.gitlab.embed-soft:lvglkt-core (io.gitlab.embed-soft:lvglkt-core-linuxx64): 0.3.0" (was initially compiled with "io.gitlab.embed-soft:lvglkt-core (io.gitlab.embed-soft:lvglkt-core-linuxx64): 0.2.0")
2. "io.gitlab.embed-soft:lvglkt-drivers (io.gitlab.embed-soft:lvglkt-drivers-linuxx64): 0.3.0" (was initially compiled with "io.gitlab.embed-soft:lvglkt-drivers (io.gitlab.embed-soft:lvglkt-drivers-linuxx64): 0.2.0")

Tried to resolve the issue by clearing out the local Maven repository cache (in ~/.m2/repository), republishing the libraries, and rebuilding the Linux X64 binary however the same issue occurs. I'm wondering if the sample project referencing two Maven repositories (Maven Central & Maven Local) could cause this issue. @Artyom Degtyarev [JB]

Hey all, I’m using

./gradlew :shared:embedAndSignAppleFrameworkForXcode

in a run script build phase in Xcode. Is there a way to change the output format of the errors from kotlin compiler (or gradle?) so that they show up as errors in Xcode? Currently I’m using sed like this:

./gradlew :shared:embedAndSignAppleFrameworkForXcode 2> >(sed 's_^e: \([^:]*\): (\([0-9]*\), \([0-9]*\)): \(.*\)_&\n\1:\2:\3: error: \4_g' >&1)

which is a bit ugly but works. It seems like there should be a way to tell the kotlin compiler/gradle directly what format to use?

Has anyone had success running k/n code from python? Trying to find the right approach between CPython extension, ctypes or something else. Curious if anyone has some experiences to share

Rookie here 👋

readln

fails in IDE but works in terminal. Any idea how I can fix this? 🤔

I’m currently trying to use Storyboards with KMM. I’m aware that I can’t attach my Kotlin ViewController to the storyboard, so I’m trying to load the storyboard using

UIStoryboard.storyboardWithName(storyboardName, null).instantiateInitialViewController()

and calling view.addSubview on the main view of the resulting ViewController in my Kotlin ViewController. This works fine, and I’ve set up nice extension functions for this, but I’m seeing that the Safe Area is ignored. I set up rotation lately, reloading the storyboard on device rotation, and I noticed that the Safe Area works this time. Has anyone tried something similar and run into the same issues?

Hi how can I annotate the class used in an Extension function and not the returned type of this function e.g.

@ColorRes, @ColorInt
fun Int.doSomthing(): Int {
return getColor(this)
}

so the extension function is for @ColorRes Int, and the return type is @ColorInt if I annotate the function with @ColorRes it will take it as a return type annotation but I can’t seem to find how to annotate the main class the extension is made of

Is anyone else experiencing the Xcode 13.3 debugger just hanging when hitting a breakpoint? My setup is a Swift app -> Kotlin (1.5.31) Framework using the

embedAndSignAppleFrameworkForXcode

task. I’m trying to break on a line in a Swift file. It’s always a little slow to initialize the debugger when hitting a breakpoint in a Swift file. In the newest Xcode it just spins forever. Loading up a copy of Xcode 13.1 still works.

I updated a C library I’m using with a K/N project, and a few variables now have the following when I check the type using IDEA:

CPointer<[ERROR : Unknown type parameter 0. Please try recompiling module containing "[container not found]"]>

. I know that the types are AVStream, and that AVStream is recognized by Kotlin. This seems to occur when using the get(index) extension provided by the cinterop package. Has anyone run into this issue before? [Fixed by downgrading Kotlin from 1.6.20-RC to 1.6.10]

Does anyone use the cocoapods plugin with groovy gradle scripts? I'm trying to check the compatibility of some other code with groovy scripts, and realizing that I can't even get the cocoapods plugin working. When I call the

framework

block like

kotlin {
  cocoapods {
    framework {
      ...
    }
  }
}

I get an ambiguous method overload error. Looking at the tests in the kotlin native repo, I don't see anything that calls

framework

so maybe it's a bug.

is there currently any solution/approach to bundle files/binary data into kotlin-native executables so i can avoid having to distribute them in a zip file or such ?

Where can I find the documentation for the

.def

files used for

cinterop

? I can find examples but nothing that lists all the properties and what they can have as values.

We need to implement a funtion in kotlin with the following signature

fun foo(args: List<*>)

the args list contains many different types of arguments (Strings, Int, Bool, Callbacks). This function foo is called from Native code on ios. If a Callback(function pointer in native code) is part of the args list, kotlin converts it to a Double and we don't know how to call it in kotlin. The args parameter is very generic, because this is part of a framework integration project, which also uses code generation and so we have to handle the dynamic list of parameters at runtime.

If I return from inside a memScoped lambda, does that leak anything I’ve allocated? I would assume that return@memScoped would work fine, but I’m not sure about returning from the function.