XCode linker cannot find WebRTC symbols

Question

I'm trying to link WebRTC's framework_objc compiled from source code to existing C++ project.

When I try to pass the native video encoder or decoder factory, exactly as it done in the example:

media_deps.video_encoder_factory = webrtc::ObjCToNativeVideoEncoderFactory(
         [[RTC_OBJC_TYPE(RTCDefaultVideoEncoderFactory) alloc] init]);

I'm getting this error on linking stage:

Undefined symbol: webrtc::ObjCToNativeVideoEncoderFactory(id<RTCVideoEncoderFactory>)

rtc_enable_objc_symbol_export=true argument is set, so all the ObjC symbols are exported and here there are not any errors