我正在尝试构建一个可执行文件，该可执行文件依赖于 C 中用于 android 的共享库。我想在 android shell 上运行可执行文件。我首先使用 android ndk 构建可执行文件（我使用的是 android-ndk-r16b），然后使用adb push将 ndk 生成的文件放在我的 android 设备上，然后使用adb shell我尝试运行可执行文件。
我在 Ubuntu 14.04 上构建。我使用以下方法安装了 android arm 工具链apt-get：
sudo apt-get install gcc-arm-linux-androideabi
这是我的文件：
共享库：libcal.so
计算：
#include "cal.h"
int add(int a , int b)
{
return (a + b);
}
int sub(int a, int b)
{
return (a - b);
}
卡路里：
int add(int a , int b);
int sub(int a, int b);
生成文件：
CXX=arm-linux-androideabi-gcc
CXXFLAGS=-fPIC -Wall -I. -c
LDFLAGS=-shared
SOURCES=./cal.c
OBJECTS=$(SOURCES:.c=.o)
TARGET_LIB=libcal.so
all: $(SOURCES) $(TARGET_LIB)
$(TARGET_LIB): $(OBJECTS)
$(CXX) -o $@ $(OBJECTS) $(LDFLAGS)
.c.o:
$(CXX) $(CXXFLAGS) $< -o $@
.PHONY: clean
clean:
@rm -f $(TARGET_LIB) $(OBJECTS)
所以这就是我生成共享库的方式。然后在一个名为 jni 的文件夹中，我有以下文件：
测试.c：
#include <stdio.h>
#include "cal.h"
int main()
{
int sum = 0, diff = 0;
sum = add(3,2);
diff = sub(2,2);
printf("sum = %d\ndiff = %d\n",sum, diff);
return 0;
}
安卓.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := cal
LOCAL_SRC_FILES := $(LOCAL_PATH)/../../library/libcal.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/../../library/
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test.c
LOCAL_SHARED_LIBRARIES := cal
include $(BUILD_EXECUTABLE)
应用程序.mk
APP_ABI := armeabi-v7a
APP_PLATFORM := android-19
然后运行$ndk-build这是我的输出
rohith@rohith-Lenovo-G50-80:~/example2/hello/jni$ ndk-build
[armeabi-v7a] Prebuilt : libcal.so <= jni/../../library/
[armeabi-v7a] Install : libcal.so => libs/armeabi-v7a/libcal.so
[armeabi-v7a] Compile thumb : test <= test.c
[armeabi-v7a] Executable : test
[armeabi-v7a] Install : test => libs/armeabi-v7a/test
rohith@rohith-Lenovo-G50-80:~/example2/hello/jni$ cd ../libs/armeabi-v7a/
rohith@rohith-Lenovo-G50-80:~/example2/hello/libs/armeabi-v7a$ ls
libcal.so test
rohith@rohith-Lenovo-G50-80:~/example2/hello/libs/armeabi-v7a$
因此，我的 android 兼容文件位于 libs 文件夹中
注意：如果我不使用 Application.mk，则构建失败并显示以下输出
rohith@rohith-Lenovo-G50-80:~/example/hello/jni$ ndk-build
Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-14.
[arm64-v8a] Prebuilt : libcal.so <= jni/../../library/
[arm64-v8a] Install : libcal.so => libs/arm64-v8a/libcal.so
[arm64-v8a] Compile : test <= test.c
[arm64-v8a] Executable : test
/home/rohith/example/hello/obj/local/arm64-v8a/libcal.so: error adding symbols: File in wrong format
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [/home/rohith/example/hello/obj/local/arm64-v8a/test] Error 1
无论如何，现在我将共享库和可执行文件放在 android 设备上并运行可执行文件后，我收到以下错误：
rohith@rohith-Lenovo-G50-80:~/example2/hello/libs/armeabi-v7a$ ls
libcal.so test
rohith@rohith-Lenovo-G50-80:~/example2/hello/libs/armeabi-v7a$ cd ..
rohith@rohith-Lenovo-G50-80:~/example2/hello/libs$ adb push armeabi-v7a /data/local/rohith
push: armeabi-v7a/libcal.so -> /data/local/rohith/libcal.so
push: armeabi-v7a/test -> /data/local/rohith/test
2 files pushed. 0 files skipped.
134 KB/s (11088 bytes in 0.080s)
rohitht@rohith-Lenovo-G50-80:~/example2/hello/libs$ adb shell
root@tcc897x:/ # cd /data/local/rohith
root@tcc897x:/data/local/rohith # ls
libcal.so
test
root@tcc897x:/data/local/rohith # export LD_LIBRARY_PATH=.
root@tcc897x:/data/local/rohith # ./test
CANNOT LINK EXECUTABLE: could not load library "/home/rohith/example2/hello/obj/local/armeabi-v7a/libcal.so" needed by "./test"; caused by library "/home/rohith/example2/hello/obj/local/armeabi-v7a/libcal.so" not found
1|root@tcc897x:/data/local/rohith #
为什么它链接到关于我的笔记本电脑的路径？
如果有人能告诉我我做错了什么或就他们如何做类似的事情给我建议，我将不胜感激。
我的实际任务需要我链接更复杂的共享库并在 android shell 上运行可执行文件。如果我能得到一个简单的 .so 工作，我不知道该怎么做。