Question

我正在尝试使用NDK 9C在Android上构建Boost 1.55 Log v2库。我已经使用了补丁并使用build-android.sh构建了boost，包括线程，iostreams，随机和日志选项。我已经使用了Boost的其他功能，他们已经工作了。但似乎存在与Log V2的链接问题，我无法用现有解决方案解决。我一直得到相同的“未定义引用”错误。在网络上，人们解决了这个问题，包括“#define BOOST_ALL_DYN_LINK”，但它对我不起作用。你知道可能是什么问题吗？提前谢谢。

控制台输出：

10:35:45 **** Build of configuration Default for project BoostLogLib ****
/home/guven/Desktop/IDP/adt/android-ndk-r9c/ndk-build all 
Android NDK: WARNING: APP_PLATFORM android-9 is larger than android:minSdkVersion 8 in ./AndroidManifest.xml    
Android NDK: WARNING:jni/Android.mk:BoostLogLib: non-system libraries in linker flags: /home/guven/Desktop/IDP/adt/android-ndk-r9c/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi-v7a/libgnustl_static.a -lboost_system-gcc-mt-1_55 -lboost_filesystem-gcc-mt-1_55 -lboost_thread-gcc-mt-1_55 -lboost_iostreams-gcc-mt-1_55 -lboost_date_time-gcc-mt-1_55 -lboost_random-gcc-mt-1_55 -lboost_log-gcc-mt-1_55 -lboost_log_setup-gcc-mt-1_55 -lboost_program_options-gcc-mt-1_55 -lboost_regex-gcc-mt-1_55 -lboost_chrono-gcc-mt-1_55    
Android NDK:     This is likely to result in incorrect builds. Try using LOCAL_STATIC_LIBRARIES    
Android NDK:     or LOCAL_SHARED_LIBRARIES instead to list the library dependencies of the    
Android NDK:     current module    
[armeabi-v7a] Compile++ thumb: BoostLogLib <= BoostLogLib.cpp
[armeabi-v7a] SharedLibrary  : libBoostLogLib.so
jni/BoostLogLib.cpp:20: error: undefined reference to 'boost::log::v2_mt_posix::core::get()'
/home/guven/Desktop/IDP/workspace/3rdparty/Boost-for-Android/boost_1_55_0/boost/log/attributes/attribute_name.hpp:80: error: undefined reference to 'boost::log::v2_mt_posix::attribute_name::get_id_from_string(char const*)'
jni/BoostLogLib.cpp:20: error: undefined reference to 'boost::log::v2_mt_posix::core::set_filter(boost::log::v2_mt_posix::filter const&)'
/home/guven/Desktop/IDP/workspace/3rdparty/Boost-for-Android/boost_1_55_0/boost/log/attributes/value_extraction.hpp:232: error: undefined reference to 'boost::log::v2_mt_posix::attribute_value_set::find(boost::log::v2_mt_posix::attribute_name) const'
/home/guven/Desktop/IDP/workspace/3rdparty/Boost-for-Android/boost_1_55_0/boost/log/attributes/value_extraction.hpp:233: error: undefined reference to 'boost::log::v2_mt_posix::attribute_value_set::end() const'
/home/guven/Desktop/IDP/workspace/3rdparty/Boost-for-Android/boost_1_55_0/boost/log/attributes/value_extraction.hpp:241: error: undefined reference to 'boost::log::v2_mt_posix::aux::attach_attribute_name_info(boost::exception&, boost::log::v2_mt_posix::attribute_name const&)'
collect2: error: ld returned 1 exit status
make: *** [obj/local/armeabi-v7a/libBoostLogLib.so] Error 1

10:35:50 Build Finished (took 4s.138ms)

示例“helloworld”项目代码如下。 BoostLogLib.h文件

#ifndef BOOSTLOGLIB_H_
#define BOOSTLOGLIB_H_

#include <jni.h>

#include <iostream>

#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     HelloWorld
 * Method:    print
 * Signature: ()V
 */
JNIEXPORT jstring JNICALL Java_com_example_boostloglib_BoostLogLib_print
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif

#endif /* BOOSTLOGLIB_H_ */

BoostLogLib.cpp文件

#define BOOST_LOG_USE_CHAR
#define BOOST_ALL_DYN_LINK

#include "BoostLogLib.h"


#include <boost/log/core.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/expressions.hpp>

namespace logging = boost::log;

//[ example_tutorial_trivial_with_filtering
void init()
{
    logging::core::get()->set_filter
    (
        logging::trivial::severity >= logging::trivial::info
    );
}

int start_logging()
{
    init();

    return 0;
}

JNIEXPORT jstring JNICALL Java_com_example_boostloglib_BoostLogLib_print(JNIEnv * env, jobject obj){

    start_logging();
    jstring result = env->NewStringUTF("Hello world!!!"); // C style string to Java String
    return result;
}

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := BoostLogLib
LOCAL_SRC_FILES := BoostLogLib.cpp
LOCAL_CPP_EXTENSION := .cpp

LOCAL_CPPFLAGS += -std=c++0x

LOCAL_LDLIBS += $(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi-v7a/libgnustl_static.a

LOCAL_CFLAGS += -lpthread
LOCAL_CFLAGS += -I$(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.8/include
LOCAL_CFLAGS += -I$(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi-v7a/include

LOCAL_CFLAGS += -I/home/guven/Desktop/IDP/workspace/3rdparty/Boost-for-Android/boost_1_55_0
LOCAL_LDLIBS += -L/home/guven/Desktop/IDP/workspace/3rdparty/Boost-for-Android/build/lib -lboost_system-gcc-mt-1_55 -lboost_filesystem-gcc-mt-1_55 -lboost_thread-gcc-mt-1_55 -lboost_iostreams-gcc-mt-1_55 -lboost_date_time-gcc-mt-1_55 -lboost_random-gcc-mt-1_55 -lboost_log-gcc-mt-1_55 -lboost_log_setup-gcc-mt-1_55 -lboost_program_options-gcc-mt-1_55 -lboost_regex-gcc-mt-1_55 -lboost_chrono-gcc-mt-1_55

LOCAL_CPPFLAGS += -fexceptions
LOCAL_CPPFLAGS += -frtti

include $(BUILD_SHARED_LIBRARY)

Application.mk

APP_MODULES := BoostLogLib
APP_ABI := armeabi-v7a
APP_STL := gnustl_static
APP_PLATFORM := android-9
NDK_TOOLCHAIN_VERSION := 4.8
APP_CPPFLAGS += -std=c++0x

Answer 1

似乎问题是由于静态库链接引起的问题是它寻找这样的符号：

boost::log::v2_mt_posix::core::set_filter

但相反，图书馆有符号：

boost::log::v2s_mt_posix::core::set_filter

如果删除了#define BOOST_ALL_DYN_LINK，则将Application.mk中的APP_STL从gnustl_static更改为gnustl_shared。然后问题就消失了。但它不应该这样。

请注意，它仅适用于如下构建库

./build-android.sh --boost=1.55.0 --with-libraries=date_time,filesystem,program_options,regex,signals,system,thread,iostreams,random,log,serialization,graph $PATH_TO_NDK

Boost Log V2库Android链接

1 个答案: