kotlinlang #kotlin-native

:android:app:transformClassesWithDexForDebug
Dex: Error converting bytecode to dex:
Cause: Dex cannot parse version 52 byte code.
This is caused by library dependencies that have been compiled using Java 8 or above.
If you are using the 'java' gradle plugin in a library submodule add
targetCompatibility = '1.7'
sourceCompatibility = '1.7'
to that submodule's build.gradle file.
    UNEXPECTED TOP-LEVEL EXCEPTION:
    java.lang.RuntimeException: Exception parsing classes
        at com.android.dx.command.dexer.Main.processClass(Main.java:781)
        at com.android.dx.command.dexer.Main.processFileBytes(Main.java:747)
        at com.android.dx.command.dexer.Main.access$1200(Main.java:88)
        at com.android.dx.command.dexer.Main$FileBytesConsumer.processFileBytes(Main.java:1689)
        at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:284)
        at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:166)
        at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
        at com.android.dx.command.dexer.Main.processOne(Main.java:695)
        at com.android.dx.command.dexer.Main.processAllFiles(Main.java:592)
        at com.android.dx.command.dexer.Main.runMonoDex(Main.java:321)
        at com.android.dx.command.dexer.Main.run(Main.java:292)
        at com.android.builder.internal.compiler.DexWrapper.run(DexWrapper.java:54)
        at com.android.builder.core.DexByteCodeConverter.lambda$dexInProcess$0(DexByteCodeConverter.java:174)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
    Caused by: com.android.dx.cf.iface.ParseException: bad class file magic (cafebabe) or version (0034.0000)
        at com.android.dx.cf.direct.DirectClassFile.parse0(DirectClassFile.java:476)
        at com.android.dx.cf.direct.DirectClassFile.parse(DirectClassFile.java:406)
        at com.android.dx.cf.direct.DirectClassFile.parseToInterfacesIfNecessary(DirectClassFile.java:388)
        at com.android.dx.cf.direct.DirectClassFile.getMagic(DirectClassFile.java:251)
        at com.android.dx.command.dexer.Main.parseClass(Main.java:793)
        at com.android.dx.command.dexer.Main.access$1600(Main.java:88)
        at com.android.dx.command.dexer.Main$ClassParserTask.call(Main.java:1728)
        at com.android.dx.command.dexer.Main.processClass(Main.java:779)

levcom

01/21/2018, 7:50 PM

What can replace KFunction.call(...) without reflection in Kotlin.Native?

jmullin

01/22/2018, 4:46 PM

So presently we can’t get a function pointer to a function that returns a struct by value. Two questions: is there a known workaround to this, and where does this feature sit on the priorities list (if anywhere currently)?

nyxcharon

01/22/2018, 6:16 PM

Is there a standard api for kotlin native listed online anywhere?

clifton

01/22/2018, 7:21 PM

Newbie here… I’m taking another stab at learning Kotlin native and I need help understanding how bindings work. When you run the cinterop tool it generates a .klib from the headers defined in the given .def file. Does the klib link to the native library dynamically or statically? I don’t understand when/how the native library is resolved. Does it need to be in a special LD_LIBRARY path when running the final binary produced by kotlinc? Or does it somehow get compiled into the binary when running the kotlinc cmd?

clifton

01/22/2018, 7:42 PM

still for the dynamic libs how does the system know where to link at runtime? Do I set a LD_LIBRARY env var before running or is there a predetermined search path for each OS or…?

alexanderUV

01/23/2018, 6:17 AM

is there any plan to write a build system+package mgr for kotlin native like swiftPM?

wakingrufus

01/23/2018, 4:35 PM

has anyone looked at making QT apps with kotlin/Native?

kikitux

01/24/2018, 1:50 PM

not trying to take shorcuts, but in case someone can RTFM in the right direction:

alec

01/24/2018, 3:49 PM

are there any plans to generated

.swiftmodule

and

.switftdoc

as an alternative to the currently generated objc headers?

spierce7

01/25/2018, 5:28 AM

It's been a little while since I've looked at kotlin-native, and was wondering at the status: 1. Does debugging work now? 2. If so does debugging from an iOS device work?

➕ 2

spierce7

01/25/2018, 4:53 PM

Is there any ETA for when kotlin-native will work with multi-platform projects, and when kotlin-native will be supported in the multi-platform libraries that kotlin has like

kotlinx.serialization

clifton

01/25/2018, 6:27 PM

I’m a little further in my tinkering/understanding. I’m now trying to create a small Kotlin example using libcurl but I’m getting a runtime error:

Copy code

SFO1212474815A:easycurl 212474815$ kotlinc curl.kt -library curlklib -o kurl
KtFile: curl.kt
ld: warning: directory not found for option '-L/opt/local/lib'
ld: warning: could not create compact unwind for _ffi_call_unix64: does not use RBP or RSP based frame
SFO1212474815A:easycurl 212474815$ ./kurl.kexe
Download from URL
Error performing CURL download: CPointer(raw=0x10e711808)

jkbbwr

01/26/2018, 3:58 AM

Anyone know why this line is not working

Copy code

val serverAddr = alloc<sockaddr_in>()

Czar

01/26/2018, 10:57 AM

Quick question. Is Kotlin Native CLion-only or IntelliJ IU supports it (will support it at some point) too?

draciel

01/26/2018, 11:58 PM

Did someone compiled properly a code with vulkan api? cinterop properly generated bindings (IDE prompts vulkan methods, I am able to create vulkan structs etc) but during final compilation I get many undefined references errors.

gildor

01/30/2018, 12:45 AM

You should build against both platforms. But K/N doesn't support multiplatform projects yet.

albertgao

01/30/2018, 4:48 AM

I want to declare a function type that returns nothing like

var successCallback: (result: String) -> Unit

, However the generated ObjC code is

@property NativeLibsStdlibUnit*(^errorCallback)(NSString*);

, I want to have a declaration at the swift side using something like this:

var successCallback: (_ result: String) -> Void

. Anything I did wrong? The official example are all return

Any

can’t find an example of returning

Unit

at the kotlin side which could be translated to

Void

in Swift side.

kikitux

01/30/2018, 10:35 AM

is there any kotlin/native example for suspended functions?

albertgao

01/30/2018, 10:09 PM

Are there any conditional compile strategies? Something like

If (android) {a=andA} else if (ios) {a=iosA}

. I want to use interfaces to separate some platform-specific logic, then compile them according to different platform

albertgao

01/31/2018, 1:47 AM

How to setup the project dependencies for platform specific code? When I

import platform.Foundation.*

, IDEA said

cant resolve platform

. I think maybe it’s because I have not setup the

dependencies

in the

build.gradle

? But can’t find them in the

kotlin-conf

and KN

samples

either, I can’t get the auto-completion there, but at least they seem to resolve the kotlin native libs without problem. Basically the same

build.gradle

. Anything I missed here?

gildor

02/01/2018, 5:49 AM

There is a problem that CLion doesn’t work with Gradle, so you cannot build Android application from CLion

kikitux

02/02/2018, 10:40 AM

any pointer to get KN parsing json into data class ?

rootandy

02/02/2018, 2:09 PM

or if there is not alerady a possibility, maybe some plans?

rCorbellini

02/05/2018, 2:40 PM

Someone know where i can found a example of project for IOS, with a simple tutorial of how can compile and deploy?

ianbrandt

02/06/2018, 7:19 AM

Out of curiosity, how are unsigned types handled by Kotlin/Native? The docs just say, "All supported C types have corresponding representations in Kotlin: Signed, unsigned integral and floating point types are mapped to their Kotlin counterpart with the same width." (https://github.com/JetBrains/kotlin-native/blob/master/INTEROP.md) What happens if a native API returns an unsigned type with a value that is out of range for the corresponding signed type in Kotlin (e.g. an unsigned short with a value of 65535)?

svyatoslav.scherbina

02/07/2018, 9:07 AM

@rootandy @Jacob It is partially possible, because Objective-C supports “lightweight generics”. But only for classes, not protocols. So we consider mapping type parameters of Kotlin classes to Objective-C generics as a possible feature, but are not working on it right now.

👍 6