我試圖使用JNI爲Android上運行一些本機C++程序構建Botan(用於加密算法的庫)的一個版本。
我已經設法創建一個libbotan.so使用NDK工具鏈(NDK R5b)沒有任何錯誤。 但是,當我從我的Android項目(例)我收到以下錯誤編譯我的源文件(exampleError.cpp):當使用JNI訪問我的共享庫時出現「未定義的引用」
Android NDK: WARNING: Unsupported source file extensions in /home/fensta/workspace
/Example/jni/Android.mk for module botan
Android NDK: sources
Android NDK: WARNING: Unsupported source file extensions in /home/fensta/workspace
/Example/jni/Android.mk for module botan
Android NDK: sources
Install : libbotan.so => libs/armeabi/libbotan.so
Compile++ thumb : fooBar <= exampleError.cpp
SharedLibrary : libfooBar.so
/home/fensta/workspace/Example/obj/local/armeabi/objs/fooBar/exampleError.o: In
function `LibraryInitializer':
/home/fensta/workspace/Example/jni/botan/botan_all.h:5593: undefined reference to `
Botan::LibraryInitializer::initialize(std::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&)'
/home/fensta/workspace/Example/obj/local/armeabi/objs/fooBar/exampleError.o: In
function `~LibraryInitializer':
/home/fensta/workspace/Example/jni/botan/botan_all.h:5595: undefined reference to `
Botan::LibraryInitializer::deinitialize()'
/home/fensta/workspace/Example/jni/botan/botan_all.h:5595: undefined reference to `
Botan::LibraryInitializer::deinitialize()'
/home/fensta/workspace/Example/obj/local/armeabi/objs/fooBar/exampleError.o: In
function `~LibraryInitializer':
/home/fensta/Programs/android-ndk-r5b/sources/cxx-stl/stlport/stlport
/stl/_string_base.h:156: undefined reference to `
Botan::LibraryInitializer::deinitialize()'
collect2: ld returned 1 exit status
make: *** [/home/fensta/workspace/Example/obj/local/armeabi/libfooBar.so] Error 1
這裏是我的exampletError.cpp:
#include <jni.h>
#include <string>
#include <botan/botan_all.h>
using namespace Botan;
JNIEXPORT void JNICALL Java_test_example_example_simpleTestCall (JNIEnv *env, jobject
object){
LibraryInitializer init;// <- calling a random type from Botan fails
}
這裏是相應的Java類createError.java: private native void simpleTestCall();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
...
simpleTestCall();
}
在這裏你可以看到Android.mk:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libbotan
LOCAL_CPPFLAGS += -fexceptions
LOCAL_SRC_FILES := sources
LOCAL_C_INCLUDES := includes
include $(BUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := fooBar
LOCAL_SRC_FILES := exampleError.cpp
LOCAL_SHARED_LIBRARIES:=
libbotan
LOCAL_CPPFLAGS += -fexceptions
include $(BUILD_SHARED_LIBRARY)
最後,但並非最不重要的Application.mk:
APP_ABI := armeabi armeabi-v7a
APP_PROJECT_PATH := /home/fensta/workspace/Example
APP_STL := stlport_shared
注:JNI文件夾的結構如下所示: Android.mk Application.mk botan/botan_all.h sources/botan_all.cpp exa mpleError.cpp
我還檢查是如下libbotan.so的內容:
/workspace/Example/obj/local/armeabi$ nm libbotan.so
000a _DYNAMIC
000012bc a _GLOBAL_OFFSET_TABLE_
000012c8 A __bss_end__
000012c8 A __bss_start
000012c8 A __bss_start__
000012c8 D __data_start
000012c8 A __end__
00000233 A __exidx_end
00000233 A __exidx_start
000012c8 A _bss_end__
000012c8 A _edata
000012c8 A _end
但我不知道是否有可能在這個輸出中看到任何錯誤。 此外,我也在網上搜索這個錯誤,例如here。 不幸的是,我還沒有能夠解決我的問題呢。
所以我的問題是:我做錯了什麼?
你有什麼進展嗎? – 2011-03-05 20:03:55
Ups,沒有看到您的評論。現在一切都很好,再次感謝:) – Stefan 2011-03-06 11:55:57