我正在尝试编译来自http://developer.nvidia.com/tegra-resources的nvfile库，在Android NDK示例中的libs文件夹中。然而，由于我实际上并不需要整套库，因此我提取了一个我需要的库，以及其依赖项。以下是用于编译它们的Android.mk文件。
include $(CLEAR_VARS)
LOCAL_MODULE := nvthread
LOCAL_CFLAGS := -Wall -g
LOCAL_LDFLAGS := -Wl,-Map,xxx.map
LOCAL_SRC_FILES := nv/nv_thread/nv_thread.c
LOCAL_C_INCLUDES := nv
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := nvfile
LOCAL_CFLAGS := -Wall -g
LOCAL_LDFLAGS := -Wl,-Map,xxx.map
LOCAL_SRC_FILES := nv/nv_file/nv_file.c
LOCAL_C_INCLUDES := nv
LOCAL_STATIC_LIBRARIES := nvthread nvapkfile
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := nvapkfile
LOCAL_CFLAGS := -Wall -g
LOCAL_LDFLAGS := -Wl,-Map,xxx.map
LOCAL_SRC_FILES := nv/nv_apk_file/nv_apk_file.c
LOCAL_C_INCLUDES := nv
LOCAL_STATIC_LIBRARIES := nvthread
include $(BUILD_STATIC_LIBRARY)
nvapkfile库似乎可以与nvthread正常链接，但nvfile库似乎根本不想链接到nvapkfile库。源代码中的包含文件正常工作，只是每当我尝试编译它时，我会得到一个未定义的引用。以下是输出示例：
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFInit':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:49: undefined reference to `NvAPKInit'
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFOpen':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:77: undefined reference to `NvAPKOpen'
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:82: undefined reference to `NvAPKOpen'
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFClose':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:97: undefined reference to `NvAPKClose'
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFGetc':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:118: undefined reference to `NvAPKGetc'
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFGets':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:133: undefined reference to `NvAPKGets'
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFSize':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:148: undefined reference to `NvAPKSize'
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFSeek':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:171: undefined reference to `NvAPKSeek'
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFTell':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:186: undefined reference to `NvAPKTell'
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFRead':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:201: undefined reference to `NvAPKRead'
/home/leif/MarbleMachine/android/obj/local/armeabi/libnvfile.a(nv_file.o): In function `NvFEOF':
/home/leif/MarbleMachine/android/jni/nv/nv_file/nv_file.c:216: undefined reference to `NvAPKEOF'
我并没有实际修改c或h文件。但是为了参考，这里是相关C文件的一部分：
#include "nv_file.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef ANDROID
#include "../nv_apk_file/nv_apk_file.h"
#define SUPPORT_APK 1
#include <unistd.h>
#endif
//...
void NvFInit()
{
#ifdef SUPPORT_APK
NvAPKInit();
#endif
}
这是nv_file.c的22-32行和46-51行。
可以看到，头文件被包含进来了，但是没有链接。这里缺少什么东西吗？谢谢。