makefile - Android NDK - Including prebuilt static libraries gives undefined reference errors -

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i trying build shared library using prebuilt static library. reason, building fails giving undefined reference errors. if add local_allow_undefined_symbols := true, building succeeds shared library few kilobytes while static library 3 megabytes... seems went wrong in linking static library. have no idea be. using c++ code.

android.mk:

local_path := $(call my-dir)  include $(clear_vars)  local_module    := kes local_export_c_includes := $(local_path)/include local_src_files := libkes.a  include $(prebuilt_static_library)  include $(clear_vars)  local_module    := portakes local_src_files := portakes.cpp local_static_libaries := kes  include $(build_shared_library)

application.mk:

app_abi := app_stl := stlport_static

jni directory structure:

jni folder structure

output:

./obj/local/arm64-v8a/objs/portakes/portakes.o: in function `java_com_kurzweil_portakes_kesfile_createpolefile': c:\users\niels.mylle\documents\kurzweil mobile android\portakes/jni/portakes.cpp:18: undefined reference `cpolefile::cpolefile(char const*, bool, bool, cencrypter*)' ./obj/local/arm64-v8a/objs/portakes/portakes.o: in function `java_com_kurzweil_portakes_kesfile_createksection': c:\users\niels.mylle\documents\kurzweil mobile android\portakes/jni/portakes.cpp:33: undefined reference `cksection::cksection(char const*, cpolefile*, cpoleleaf*)' ./obj/local/arm64-v8a/objs/portakes/portakes.o: in function `java_com_kurzweil_portakes_polefile_destroy': c:\users\niels.mylle\documents\kurzweil mobile android\portakes/jni/portakes.cpp:48: undefined reference `cpolefile::~cpolefile()' ./obj/local/arm64-v8a/objs/portakes/portakes.o: in function `java_com_kurzweil_portakes_polefile_exists': c:\users\niels.mylle\documents\kurzweil mobile android\portakes/jni/portakes.cpp:100: undefined reference `cpolefile::exists(char const*)' collect2.exe: error: ld returned 1 exit status make.exe: *** [obj/local/arm64-v8a/libportakes.so] error 1

maybe it's part of problem, @ least reference wrong: 

local_src_files := libkes.a

you're building ndk compatible architectures, referencing same static prebuilt each of them, cannot work.

you should have different .a each architecture you're targeting, ie ./armeabi/libkes.a, ./x86/libkes.a, ./armeabi-v7a/libkes.a, etc. in case you'll able reference .a using target_arch_abi variable, so:

local_src_files := $(target_arch_abi)/libkes.a

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