Question

我安装了mongocxx驱动程序，如http://mongodb.github.io/mongo-cxx-driver/mongocxx-v3/installation/所示，当我测试驱动程序时，一切看起来都很好，但是如果更改一点代码，则在加载共享库时出现错误：libbsoncxx.so._noabi：无法打开共享对象文件：没有这样的文件或目录。

代码：

CMakeLists.txt

cmake_minimum_required(VERSION 3.10)

if(POLICY CMP0025)
    cmake_policy(SET CMP0025 NEW)
endif()

project(test_mongodb LANGUAGES C CXX)

if(NOT DEFINED CMAKE_CXX_STANDARD)
    set(CMAKE_CXX_STANDARD 11)
endif()

set(CMAKE_PREFIX_PATH CMAKE_PREFIX_PATH "~/opt/mongo-cxx-driver/install")
set(CMAKE_CXX_EXTENSIONS OFF)

if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Werror")
endif()


add_executable(test_mongodb main.cpp)

find_package(libmongocxx REQUIRED)

target_include_directories(test_mongodb
        PRIVATE ${LIBMONGOCXX_INCLUDE_DIRS}
        )

target_link_libraries(test_mongodb
        PRIVATE ${LIBMONGOCXX_LIBRARIES}
        )

target_compile_definitions(test_mongodb
        PRIVATE ${LIBMONGOCXX_DEFINITIONS}
        )

add_custom_target(run
        COMMAND test_mongodb
        DEPENDS test_mongodb
        WORKING_DIRECTORY ${CMAKE_PROJECT_DIR}
        )

list(FIND LIBMONGOCXX_DEFINITIONS "BSONCXX_STATIC" LIST_IDX)
if (${LIST_IDX} GREATER -1)
    message(FATAL_ERROR "Expected BSONCXX_STATIC to not be defined")
endif()
list(FIND LIBMONGOCXX_DEFINITIONS "MONGOCXX_STATIC" LIST_IDX)
if (${LIST_IDX} GREATER -1)
    message(FATAL_ERROR "Expected MONGOCXX_STATIC to not be defined")
endif()

main.cpp

#include <iostream>

#include <bsoncxx/builder/stream/document.hpp>
#include <bsoncxx/json.hpp>

#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>
#include <mongocxx/cursor.hpp>


int main(int argc, char* argv[]) {
    using bsoncxx::builder::basic::kvp;
    using bsoncxx::builder::basic::make_document;

    mongocxx::instance inst;

    try {
        const auto uri = mongocxx::uri{(argc >= 2) ? argv[1] : mongocxx::uri::k_default_uri};

        auto client = mongocxx::client{uri};
        auto admin = client["admin"];
        auto result = admin.run_command(make_document(kvp("isMaster", 1)));
        std::cout << bsoncxx::to_json(result) << std::endl;

        return EXIT_SUCCESS;
    } catch (const std::exception& xcp) {
        std::cout << "connection failed: " << xcp.what() << std::endl;
        return EXIT_FAILURE;
    }
}

如果我从代码中删除auto result = admin.run_command(make_document(kvp("isMaster", 1)));，则在加载共享库libbsoncxx.so._noabi 时出现错误，如果不能正常工作。知道为什么它会那样吗？

Ubuntu 18.04 cc 7.3.0， C ++ 7.3.0， CMake 3.11.3

Answer 1

您正在以太低的级别进入CMake find子系统：Mongo C ++驱动程序提供了与CMake find_package子系统的集成，该子系统为您完成了许多工作。您应该只需说出find_package(libmongocxx REQUIRED)，然后使用预先填充的变量LIBMONGOCXX_{INCLUDE_DIRS,LIBRARIES,DEFINITIONS}。

对于许多示例项目，请参见源代码中的顶级examples/projects目录，这些示例项目说明如何通过CMake的{mongo,bson}cxx和find_package与pkgconfig进行集成。

我认为，鉴于您在上面针对的用途，您应该从目录examples/projects/mongocxx/cmake/shared开始。

Answer 2

当我使用readelf时，我收到了：

File: libmongocxx.so

(NEEDED) Shared library: [libbsoncxx.so._noabi]
(NEEDED) Shared library: [libmongoc-1.0.so.0]
(NEEDED) Shared library: [libbson-1.0.so.0]
(NEEDED) Shared library: [libstdc++.so.6]
(NEEDED) Shared library: [libgcc_s.so.1]
(NEEDED) Shared library: [libc.so.6]
(SONAME) Library soname: [libmongocxx.so._noabi]
(RUNPATH) Library runpath: [/home/adam/opt/mongo-c-driver/install/lib]

File: test_mongodb ( with error )
(NEEDED) Shared library: [libmongocxx.so._noabi]
(NEEDED) Shared library: [libstdc++.so.6]
(NEEDED) Shared library: [libc.so.6]
(RUNPATH) Library runpath: [/home/adam/opt/mongo-cxx-driver/install/lib]

File: test_mongodb ( without error )
(NEEDED) Shared library: [libmongocxx.so._noabi]
(NEEDED) Shared library: [libbsoncxx.so._noabi]
(NEEDED) Shared library: [libstdc++.so.6]
(NEEDED) Shared library: [libgcc_s.so.1]
(NEEDED) Shared library: [libc.so.6]
(RUNPATH) Library runpath: [/home/adam/opt/mongo-cxx-driver/install/lib]

Answer 3

https://www.cnblogs.com/pluse/p/5491300.html 对于erros而言，reson是关于库链接的。只需重新链接库，如下所示就可以解决问题


    sudo ln -s /usr/local/lib/libmogocxx.so.3.4.0 libmongocxx.so._noabi
    sudo ln -s /usr/local/lib/libmongocxx.so._noabi /usr/local/lib/libmongocxx.so

加载共享库时出错：libbsoncxx.so._noabi：无法打开共享库文件：没有这样的文件或目录

3 个答案: