I'm getting a linker error after declaring a funct...

# kotlin-native

[Jeff Lockhart]

I'm getting a linker error after declaring a function in my .def file and using it in Kotlin:

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_CBLC4Document", referenced from:
      objc-class-ref in result.o
  "_c4db_getDoc", referenced from:
      _cocoapods_CouchbaseLite_c4db_getDoc_wrapper0 in result.o
ld: symbol(s) not found for architecture x86_64

The function c4db_getDoc() is implemented in the library here. Its declaration just isn't in the framework's public headers, which is why I added it as a custom definition. Its internal declaration is in this .h file. I've declared it this same way in the .def (along with the struct parameter types):

C4Document* c4doc_get(C4Database *database, C4String docID, bool mustExist, C4Error* outError);

Would the issue be that the implementation is in a .cc C++ file and Kotlin doesn't support C++ interop? If so, is there some way I could access this function?

[Jeff Lockhart]

Also, oddly the _OBJC_CLASS_$_CBLC4Document error also only happens after adding this function to the .def. That class isn't used at all in this function though. The custom declaration I added which does use it works perfectly fine before adding this other function though.

[Jeff Lockhart]

I ended up finding an ObjC API to use for this, with a round-about workaround to add it to the interop (https://youtrack.jetbrains.com/issue/KT-53285/Cant-add-ObjC-init-constructor-in-a-category-declaration-in-def), but still curious about the reason for this linker error.