Hey there wave I m trying to pack the classes of a `cinterop

Question

Hey there wave I m trying to pack the classes of a `cinterop multiplatform dependency` into the `shared framework` for my iOS app to make them available The dependency uses `cinterop` as it s wrapping a C library I m already trying to `export` it via the Gradle setup see setup in the thread Though when building in either Xcode or AppCode I get an error about `missing symbols for architecture x86 64` and a warning that the `dependency can t be exported` see error log in the thread I tried fixing this by including the ` def` file of the wrapping dependency and the `include` folder of the C library itself and making the export `transitive` But this didn t help I m using Kotlin 1 5 31

Bastian · Answer

setup omitted android setup and rest of file for brevity ```kotlin ios binaries framework baseName = shared export io github matrixkt client $matrixKtVersion export io github matrixkt olm $matrixKtVersion compilations getByName main val libolm by cinterops creating defFile project file libolm def includeDirs projectDir resolve include sourceSets val commonMain by getting dependencies implementation org jetbrains kotlin kotlin stdlib common implementation org jetbrains kotlinx kotlinx coroutines core $coroutineVersion implementation org jetbrains kotlinx kotlinx serialization json 1 2 2 implementation io ktor ktor client core $ktorVersion api io github matrixkt client $matrixKtVersion api io github matrixkt olm $matrixKtVersion android target will pick up aar version instead see androidMain exclude group= net java dev jna module= jna implementation org matrix gitlab matrix org olm 3 2 4 val iosMain by getting dependencies implementation io ktor ktor client ios $ktorVersion implementation org jetbrains kotlinx kotlinx coroutines core $coroutineVersion version strictly coroutineVersion still got to enforce ```

Bastian · Answer

error when building both in AppCode and Xcode omitted some olm missing references for brevity ``` gt Task shared cinteropLibolmIosX64 UP TO DATE gt Task shared compileKotlinIosX64 UP TO DATE gt Task shared linkDebugFrameworkIosX64 w Interop library Users bc gradle caches modules 2 files 2 1 io github matrixkt olm iosx64 0 1 5 7175481a6a0031fc9611b550bbcf7658d69c6d4f olm cinterop libolm can t be exported with Xexport library e Applications Xcode 12 5 1 app Contents Developer Toolchains XcodeDefault xctoolchain usr bin ld invocation reported errors The Applications Xcode 12 5 1 app Contents Developer Toolchains XcodeDefault xctoolchain usr bin ld command returned non zero exit code 1 output Undefined symbols for architecture x86 64 olm sas set their key referenced from colm internal olm sas set their key wrapper130 in result o olm outbound group session message index referenced from colm internal olm outbound group session message index wrapper30 in result o ld symbol s not found for architecture x86 64 gt Task shared linkDebugFrameworkIosX64 FAILED FAILURE Build failed with an exception What went wrong Execution failed for task shared linkDebugFrameworkIosX64 gt Compilation finished with errors```

Bastian · Answer

So I was able to solve it All I had to do was white check mark make sure the Kotlin Multiplatform dependency had C Bindings for iOS Architectures white check mark compile the C dependency of my dependency for iOS myself as there were no prebuilts Found an iOS wrapper project which luckily had a `Package swift` defining a target for only the C dependency So I could use `xcodebuild` to compile the lib white check mark put the built library into my KM project white check mark link it in my `binaries framework `