未定义的引用链接Android中的预构建共享库与NDK

Question

我有一个预建的共享库，名为“tshark.so”，我试图链接每当我建立另一个共享库（libwireshark_helper.so）。 libtshark.so位于$（LOCAL_PATH）中。这里是我的Android.mk

LOCAL_PATH:= $(call my-dir)                                                               
include $(CLEAR_VARS)                                                                
NDK_MODULE_PATH := $(LOCAL_PATH)                                                             
LOCAL_SRC_FILES:= wireshark_helper.c                                                         
LOCAL_MODULE := libwireshark_helper                                                             
LOCAL_PREBUILT_LIBS := libtshark.so                                                             
LOCAL_C_INCLUDES += jni/libusb-compat/libusb jni/wispy jni/libpcap jni/libwireshark jni/libglib jni/libglib/glib jni/libglib/android jni/libwireshark/epan jni/libwireshark/epan/dissectors                       
LOCAL_SHARED_LIBRARIES := libc libusb libusb-compat libwispy libpcap libglib-2.0 libgmodule-2.0 libnl libtshark                                          
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -L$(LOCAL_PATH) -llog -ltshark -lgcc -lz                                                  
include $(BUILD_SHARED_LIBRARY) 

例如，“tshark的”库包含了该方法的tshark_log_handler“这里所示：

$ arm-eabi-nm libtshark.so | grep tshark_log_handler 
005d298c t tshark_log_handler 

然而，当我试图打造，我得到的错误：

SharedLibrary : libwireshark_helper.so 
/Users/gnychis/Documents/android-ndk-r5b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/darwin-x86/bin/arm-linux-androideabi-g++ -Wl,-soname,libwireshark_helper.so -shared --sysroot=/Users/gnychis/Documents/android-ndk-r5b/platforms/android-9/arch-arm /Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/objs-debug/wireshark_helper/wireshark_helper.o /Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/libusb.so /Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/libusb-compat.so /Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/libwispy.so /Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/libpcap.so /Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/libglib-2.0.so /Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/libgmodule-2.0.so /Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/libnl.so /Users/gnychis/Documents/android-ndk-r5b/platforms/android-9/arch-arm/usr/lib/libc.so /Users/gnychis/Documents/android-ndk-r5b/platforms/android-9/arch-arm/usr/lib/libstdc++.so /Users/gnychis/Documents/android-ndk-r5b/platforms/android-9/arch-arm/usr/lib/libm.so -Wl,--no-undefined -Wl,-z,noexecstack -L/Users/gnychis/Documents/android-ndk-r5b/platforms/android-9/arch-arm/usr/lib -L/Users/gnychis/Documents/android-ndk-r5b/platforms/android-9/arch-arm/usr/lib -L/Users/gnychis/Documents/workspace/CoexiSyst/jni/libwireshark -llog -ltshark -lgcc -lz -Wl,-rpath-link=/Users/gnychis/Documents/android-ndk-r5b/platforms/android-9/arch-arm/usr/lib -lsupc++ -o /Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/libwireshark_helper.so 
/Users/gnychis/Documents/workspace/CoexiSyst/obj/local/armeabi/objs-debug/wireshark_helper/wireshark_helper.o: In function `Java_com_gnychis_coexisyst_CoexiSyst_wiresharkHello': 
/Users/gnychis/Documents/workspace/CoexiSyst/jni/libwireshark/wireshark_helper.c:124: undefined reference to `tshark_log_handler' 

为什么我应该得到一个未定义的参考？它在我的共享库中，并且在我的gcc命令中有一个“-ltshark”。我没有得到一个错误，它无法找到这个库。

Answer 1

nm中的符号类型“t”表示符号位于库中，但不是全局符号。全局函数显示为符号类型“T”。换句话说，这个函数是用“static”关键字声明的，并且你不能在你的代码中使用它。