Error linking non elf libraries into a single one

Question

I'm trying to build a valid Android library to be used with a game engine called ShiVa, here it is the problem too: engine forum, photon cloud forum, but I think I've reached the point to ask in stackoverflow, because the main error now is this:

 [exec] jni/prebuilt/plugins/armeabi-v7a/PhotonCloudAPI.a(Plugin.o):Plugin.cpp:function _GLOBAL__sub_I_Plugin.cpp: error: undefined reference to 'std::ios_base::Init::Init()'

I found this error in here, but I'm not using any string.h, only string and similar libs, well, this is the Shiva plugin Makefile:

#################################################################
#   ShiVa Extension Plugin Makefile for Android
#################################################################

ANDROID_NDK_ROOT    = C:/Games/sdks/android-ndk-r12b
TEMP_DIR            = ../../Temp/Android
TEMP_DIR_ARM5       = $(TEMP_DIR)/arm5
TEMP_DIR_ARM7       = $(TEMP_DIR)/arm7
TEMP_DIR_X86        = $(TEMP_DIR)/x86
SRCROOT             = ../../Sources
S3DXROOT            = ../../Sources/S3DX
BUILT_PRODUCTS_DIR  = ../../Contents/Android
PHOTON_DIR          = ../../Libs/Photon-AndroidNDK-Sdk_v4-1-3-3
PRODUCT_NAME_ARM5   = PhotonCloudAPI_Android.a
PRODUCT_NAME_ARM7   = PhotonCloudAPI_Android_arm_v7a.a
PRODUCT_NAME_X86    = PhotonCloudAPI_Android_x86_32.a

#################################################################
#  User data
#
USER_INCLUDE_PATH   = -L"$(PHOTON_DIR)/Common-cpp/lib/common-cpp-prebuilt" -L"$(PHOTON_DIR)/Photon-cpp/lib/photon-cpp-prebuilt" -L"$(PHOTON_DIR)/LoadBalancing-cpp/lib/loadbalancing-cpp-prebuilt"
USER_LIBRARIES_ARM5 = -lphoton-cpp-static_debug_android_armeabi -lcommon-cpp-static_debug_android_armeabi -lloadbalancing-cpp-static_debug_android_armeabi
USER_LIBRARIES_ARM7 = -lphoton-cpp-static_debug_android_armeabi-v7a -lcommon-cpp-static_debug_android_armeabi-v7a -lloadbalancing-cpp-static_debug_android_armeabi-v7a
USER_LIBRARIES_ARX86= -lphoton-cpp-static_debug_android_x86 -lcommon-cpp-static_debug_android_x86 -lloadbalancing-cpp-static_debug_android_armeabi_x86
USER_FLAGS          = 

#################################################################
SOURCES             = Plugin.cpp PhotonCloudAPI.cpp NetworkLogic.cpp Console.cpp

#################################################################
#  Compiler executables
#
CC_ARM5             = "$(ANDROID_NDK_ROOT)/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc" 
CPP_ARM5            = "$(ANDROID_NDK_ROOT)/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-g++"
AR_ARM5             = "$(ANDROID_NDK_ROOT)/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-ar"

CC_ARM7             = $(CC_ARM5)
CPP_ARM7            = $(CPP_ARM5)
AR_ARM7             = $(AR_ARM5)

CC_X86              = "$(ANDROID_NDK_ROOT)/toolchains/x86-4.9/prebuilt/windows-x86_64/bin/i686-linux-android-gcc"
CPP_X86             = "$(ANDROID_NDK_ROOT)/toolchains/x86-4.9/prebuilt/windows-x86_64/bin/i686-linux-android-g++"
AR_X86              = "$(ANDROID_NDK_ROOT)/toolchains/x86-4.9/prebuilt/windows-x86_64/bin/i686-linux-android-ar"

####################################################################"
#  Includes
#
SYSROOT_ARM5        = $(ANDROID_NDK_ROOT)/platforms/android-9/arch-arm
SYSROOT_ARM7        = $(ANDROID_NDK_ROOT)/platforms/android-16/arch-arm
SYSROOT_X86         = $(ANDROID_NDK_ROOT)/platforms/android-19/arch-x86
SYSTEM_INCLUDES     = -I"$(ANDROID_NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/include"
PHOTON_INCLUDES     = -I"../../Libs/Photon-AndroidNDK-Sdk_v4-1-3-3/" 

####################################################################"
#  Compiler flags
#
CFLAGS_Arch_ARM5    = -march=armv5te -msoft-float -I"$(ANDROID_NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi/include"
CFLAGS_Arch_ARM7    = -march=armv7-a -mfloat-abi=softfp -mfpu=vfp -I"$(ANDROID_NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include"
CFLAGS_Arch_X86     = -I"$(ANDROID_NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/include"
CFLAGS_Common       = -Os -Wno-unknown-pragmas -fPIC -fsigned-char -fno-strict-aliasing -fno-short-enums -fno-exceptions -D__ANDROID__ -DANDROID_NDK -DANDROID -DRELEASE -D_GNU_SOURCE -DHAVE_STDINT_H
CFLAGS_ARM5         = --sysroot="$(SYSROOT_ARM5)" $(CFLAGS_Arch_ARM5) $(CFLAGS_Common) $(SYSTEM_INCLUDES) -I"$(SRCROOT)" -I$(SRCROOT)/Android -I$(S3DXROOT) -I"$(SYSROOT_ARM5)/usr/bin" $(PHOTON_INCLUDES) $(USER_INCLUDE_PATH) $(USER_LIBRARIES_ARM5)
CFLAGS_ARM7         = --sysroot="$(SYSROOT_ARM7)" $(CFLAGS_Arch_ARM7) $(CFLAGS_Common) $(SYSTEM_INCLUDES) -I"$(SRCROOT)" -I$(SRCROOT)/Android -I$(S3DXROOT) -I"$(SYSROOT_ARM7)/usr/bin" $(PHOTON_INCLUDES) $(USER_INCLUDE_PATH) $(USER_LIBRARIES_ARM7)
CFLAGS_X86          = --sysroot="$(SYSROOT_X86)"  $(CFLAGS_Arch_X86)  $(CFLAGS_Common) $(SYSTEM_INCLUDES) -I"$(SRCROOT)" -I$(SRCROOT)/Android -I$(S3DXROOT) -I"$(SYSROOT_X86)/usr/bin" $(PHOTON_INCLUDES) $(USER_INCLUDE_PATH) $(USER_LIBRARIES_ARX86)
CPPFLAGS            = -fno-rtti -lc++_static -lsupc++ -lhosted -lxsde -std=c++11 -lstdc++ 


####################################################################"
#  Objects
#
OBJECTS             = \
    $(patsubst %.c,%.o,$(filter %.c,$(SOURCES))) \
    $(patsubst %.cc,%.o,$(filter %.cc,$(SOURCES))) \
    $(patsubst %.cpp,%.o,$(filter %.cpp,$(SOURCES)))

OBJECTS_ABS_ARM5    = $(addprefix $(TEMP_DIR_ARM5)/,$(OBJECTS))
OBJECTS_ABS_ARM7    = $(addprefix $(TEMP_DIR_ARM7)/,$(OBJECTS))
OBJECTS_ABS_X86     = $(addprefix $(TEMP_DIR_X86)/,$(OBJECTS))
PRODUCT_ABS_ARM5    = $(BUILT_PRODUCTS_DIR)/$(PRODUCT_NAME_ARM5)
PRODUCT_ABS_ARM7    = $(BUILT_PRODUCTS_DIR)/$(PRODUCT_NAME_ARM7)
PRODUCT_ABS_X86     = $(BUILT_PRODUCTS_DIR)/$(PRODUCT_NAME_X86)

####################################################################"
#  Rules
#

$(TEMP_DIR_ARM5)/%.o: $(SRCROOT)/%.c
    @mkdir -p `dirname $@`
    @echo Compiling $<
    @$(CC_ARM5) $(CFLAGS_ARM5) -c $< -o $@

$(TEMP_DIR_ARM5)/%.o: $(SRCROOT)/%.cpp
    @mkdir -p `dirname $@`
    @echo Compiling $<
    @$(CPP_ARM5) $(CFLAGS_ARM5) $(CPPFLAGS) -c $< -o $@

$(TEMP_DIR_ARM7)/%.o: $(SRCROOT)/%.c
    @mkdir -p `dirname $@`
    @echo Compiling $<
    $(CC_ARM7) $(CFLAGS_ARM7) -c $< -o $@

$(TEMP_DIR_ARM7)/%.o: $(SRCROOT)/%.cpp
    @mkdir -p `dirname $@`
    @echo Compiling $<
    $(CPP_ARM7) $(CFLAGS_ARM7) $(CPPFLAGS) -c $< -o $@

$(TEMP_DIR_X86)/%.o: $(SRCROOT)/%.c
    @mkdir -p `dirname $@`
    @echo Compiling $<
    @$(CC_X86) $(CFLAGS_X86) -c $< -o $@

$(TEMP_DIR_X86)/%.o: $(SRCROOT)/%.cpp
    @mkdir -p `dirname $@`
    @echo Compiling $<
    @$(CPP_X86) $(CFLAGS_X86) $(CPPFLAGS) -c $< -o $@

####################################################################"
#  Targets
#
all: $(PRODUCT_ABS_ARM5) $(PRODUCT_ABS_ARM7) $(PRODUCT_ABS_X86) 

$(PRODUCT_ABS_ARM5): $(OBJECTS_ABS_ARM5)
    @echo Creating ARM5 archive
    @mkdir -p $(BUILT_PRODUCTS_DIR)
    @$(AR_ARM5) rcs $(PRODUCT_ABS_ARM5) $(OBJECTS_ABS_ARM5)  
#./obj/*.o

$(PRODUCT_ABS_ARM7): $(OBJECTS_ABS_ARM7)
    @echo Creating ARM7 archive
    @mkdir -p $(BUILT_PRODUCTS_DIR)
    $(AR_ARM7) rcs $(PRODUCT_ABS_ARM7) $(OBJECTS_ABS_ARM7) ./obj/*.o

$(PRODUCT_ABS_X86): $(OBJECTS_ABS_X86)
    @echo Creating X86 archive
    @mkdir -p $(BUILT_PRODUCTS_DIR)
    @$(AR_X86) rcs $(PRODUCT_ABS_X86) $(OBJECTS_ABS_X86) 
#./obj/*.o

clean:
    @echo Cleaning
    @rm -f $(PRODUCT_ABS_ARM5) $(OBJECTS_ABS_ARM5) $(PRODUCT_ABS_ARM7) $(OBJECTS_ABS_ARM7) $(PRODUCT_ABS_X86) $(OBJECTS_ABS_X86)

####################################################################"

That produces me the game engine libraries (.a) for android app projects. Ah, you can see the Makefile uses obj/*.o files, these are extracted from the compiled photon libraries (.a) using the AR -x because the rcs method is not compatible, as the libs are not elf.

This is the Game Project Android.mk, that uses PhotonCloudAPI_Android*.a files generated by the previous makefile build process (yeah, it compiles).

LOCAL_PATH             := $(call my-dir)
ANDROID_NDK_ROOT       := C:/Games/sdks/android-ndk-r12b

include $(CLEAR_VARS)
INC_PATH := $(ANDROID_NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/include/
LOCAL_C_INCLUDES += $(ANDROID_NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/include/

include $(CLEAR_VARS)
LOCAL_MODULE           := S3DClient_Android
LOCAL_SRC_FILES        := prebuilt/engine/$(TARGET_ARCH_ABI)/libS3DClient_Android.a

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE           := openal
LOCAL_SRC_FILES        := prebuilt/thirdparty/$(TARGET_ARCH_ABI)/libopenal.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE           := ssl
LOCAL_SRC_FILES        := prebuilt/thirdparty/$(TARGET_ARCH_ABI)/libssl.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE           := crypto
LOCAL_SRC_FILES        := prebuilt/thirdparty/$(TARGET_ARCH_ABI)/libcrypto.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE           := PhotonCloudAPI
LOCAL_SRC_FILES        := prebuilt/plugins/$(TARGET_ARCH_ABI)/PhotonCloudAPI.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
NDK_DEBUG_IMPORTS      := 1
NDK_DEBUG_MODULES      := 1
LOCAL_CFLAGS           :=  -DANDROID_NDK -Wno-psabi -fno-rtti  -lc++_static -lsupc++ -DEG_DEBUGGER -D__STDINT_LIMITS -D_EG_ANDROID_PLATFORM 
LOCAL_ARM_MODE         := arm
LOCAL_MODULE           := S3DClient
LOCAL_MODULE_FILENAME  := libS3DClient
LOCAL_SRC_FILES        := S3DClient.cpp
LOCAL_STATIC_LIBRARIES := S3DClient_Android
LOCAL_SHARED_LIBRARIES := openal ssl crypto
LOCAL_WHOLE_STATIC_LIBRARIES += PhotonCloudAPI photon-cpp-static-prebuilt libcommon-cpp-static-prebuilt loadbalancing-cpp-static    
LOCAL_LDLIBS += -lGLESv2 -lEGL -ldl -llog -latomic -I"$(ANDROID_NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/include"
include $(BUILD_SHARED_LIBRARY)

Game Project Application.mk

APP_OPTIM        := debug
APP_CFLAGS       += -O3
APP_ABI          := armeabi-v7a
APP_PLATFORM     := android-14
APP_MODULES      := S3DClient
APP_PROJECT_PATH := 
APP_STL          := c++_static

I have tried everything, I think the Shiva plugin Makefile is wrong, maybe I need to add the std libs in the linking too? it compiles, but then it's the game that uses the compiled .a the one that fails to compile.

please post an SSCCE : first isolate your problem, then post it here — Mark Galeck, Sep 04 '16 at 22:50

score 0 · Accepted Answer · answered Sep 13 '16 at 16:40

I found the error, the objects extracted from the static libs contains references to the missing c++ libraries. I used the static libs directly as .a and compile the first plugin.a as static and then I used this, linking the same libs again with the new plugin.a as static for a dynamic library for the game.

Error linking non elf libraries into a single one

1 Answers1