[android help] Android NDK C++ Class undefined Reference

Android NDK C++ Class undefined Reference

You have multiple options here assuming that you have a first.cpp file that you implemented the Test class correctly. Without being able to see your Android.mk, I will go through all options:

Build First.cpp as a static or shared library and add this library to your module which compiles Second.cpp. Your Android.mk should look like:

LOCAL_PATH:= $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := libtwolib-first

LOCAL_SRC_FILES := first.c

include $(BUILD_STATIC_LIBRARY)

If you would like First to be a shared library instead of a static library, change include $(BUILD_STATIC_LIBRARY) line to:

include $(BUILD_SHARED_LIBRARY)

Now, your second lib is compiled as follows:

   include $(CLEAR_VARS)

   LOCAL_MODULE    := libtwolib-second
   LOCAL_C_INCLUDES := path/to/first.h
   LOCAL_C_INCLUDES += path/to/second.h
   LOCAL_SRC_FILES := second.cpp

   LOCAL_STATIC_LIBRARIES := libtwolib-first

   include $(BUILD_SHARED_LIBRARY)

As a second solution, you can build first.cpp as a part of the second lib and this way you don't have to worry about linking against the first library. This is more like a design choice and how you would like to shape up your libraries:

include $(CLEAR_VARS
LOCAL_MODULE    := libtwolib-second
include $(CLEAR_VARS)

LOCAL_MODULE    := libtwolib-second
LOCAL_C_INCLUDES := path/to/first.h
LOCAL_C_INCLUDES += path/to/second.h
LOCAL_SRC_FILES := first.cpp
LOCAL_SRC_FILES += second.cpp

include $(BUILD_SHARED_LIBRARY)

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