c++ ubuntu平台中的Poco库链接错误

kgsdhlau 于 2022-12-27 发布在其他

关注(0)|答案(4)|浏览(316)

我已经下载了最新的Poco库poco-1.7.3.tar。配置了一些属性并安装了。尝试了下面的helloworld示例程序。

#include <iostream>
#include <Poco/Util/Application.h>

class HelloPocoApplication : public Poco::Util::Application
{
protected:
    virtual int main(const std::vector<std::string> &args)
    {
            std::cout << "Hello, POCO C++ Libraries!" << std::endl;

            return EXIT_OK;
    }
};
POCO_APP_MAIN(HelloPocoApplication);

编译时使用
g++ -I poco-1.7.3/实用程序/包含-I poco-1.7.3/XML/包含-I poco-1.7.3/JSON/包含-I poco-1.7.3/基础/包含-L poco-1.7.3/库/Linux/x86_64 -L poco实用程序-L poco基础-L poco XML-L poco JSON helloworld.cpp -o程序
但它抛出以下错误

/tmp/ccFvl4ll.o: In function `main':
 helloworld.cpp:(.text+0x4f): undefined reference to     `Poco::Util::Application::init(int, char**)'
      helloworld.cpp:(.text+0xd9): undefined reference to    `Poco::Logger::log(Poco::Exception const&)'
    /tmp/ccFvl4ll.o: In function `Poco::RefCountedObject::release() const':
    helloworld.cpp:(.text._ZNK4Poco16RefCountedObject7releaseEv[_ZNK4Poco16RefCountedObject7releaseEv]+0x6e): undefined reference to `Poco::Bugcheck::unexpected(char const*, int)'
    /tmp/ccFvl4ll.o: In function `Poco::Util::Application::logger() const':
    helloworld.cpp:(.text._ZNK4Poco4Util11Application6loggerEv[_ZNK4Poco4Util11Application6loggerEv]+0x2c): undefined reference to `Poco::Bugcheck::nullPointer(char const*, char const*, int)'
    /tmp/ccFvl4ll.o: In function `HelloPocoApplication::HelloPocoApplication()':
    helloworld.cpp:(.text._ZN20HelloPocoApplicationC2Ev[_ZN20HelloPocoApplicationC5Ev]+0x14): undefined reference to `Poco::Util::Application::Application()'
    /tmp/ccFvl4ll.o:(.gcc_except_table+0x2c): undefined reference to `typeinfo for Poco::Exception'
    /tmp/ccFvl4ll.o: In function `Poco::AutoPtr<HelloPocoApplication>::operator->()':
    helloworld.cpp:(.text._ZN4Poco7AutoPtrI20HelloPocoApplicationEptEv[_ZN4Poco7AutoPtrI20HelloPocoApplicationEptEv]+0x3a): undefined reference to `Poco::NullPointerException::NullPointerException(int)'
    helloworld.cpp:(.text._ZN4Poco7AutoPtrI20HelloPocoApplicationEptEv[_ZN4Poco7AutoPtrI20HelloPocoApplicationEptEv]+0x3f): undefined reference to `Poco::NullPointerException::~NullPointerException()'
    helloworld.cpp:(.text._ZN4Poco7AutoPtrI20HelloPocoApplicationEptEv[_ZN4Poco7AutoPtrI20HelloPocoApplicationEptEv]+0x44): undefined reference to `typeinfo for Poco::NullPointerException'
    /tmp/ccFvl4ll.o:(.rodata._ZTV20HelloPocoApplication[_ZTV20HelloPocoApplication]+0x20): undefined reference to `Poco::Util::Application::name() const'
    /tmp/ccFvl4ll.o:(.rodata._ZTV20HelloPocoApplication[_ZTV20HelloPocoApplication]+0x28): undefined reference to `Poco::Util::Application::initialize(Poco::Util::Application&)'
    /tmp/ccFvl4ll.o:(.rodata._ZTV20HelloPocoApplication[_ZTV20HelloPocoApplication]+0x30): undefined reference to `Poco::Util::Application::uninitialize()'
    /tmp/ccFvl4ll.o:(.rodata._ZTV20HelloPocoApplication[_ZTV20HelloPocoApplication]+0x38): undefined reference to `Poco::Util::Application::reinitialize(Poco::Util::Application&)'
    /tmp/ccFvl4ll.o:(.rodata._ZTV20HelloPocoApplication[_ZTV20HelloPocoApplication]+0x40): undefined reference to `Poco::Util::Application::defineOptions(Poco::Util::OptionSet&)'
    /tmp/ccFvl4ll.o:(.rodata._ZTV20HelloPocoApplication[_ZTV20HelloPocoApplication]+0x48): undefined reference to `Poco::Util::Application::run()'
    /tmp/ccFvl4ll.o:(.rodata._ZTV20HelloPocoApplication[_ZTV20HelloPocoApplication]+0x50): undefined reference to `Poco::Util::Application::handleOption(std::string const&, std::string const&)'
    /tmp/ccFvl4ll.o: In function `HelloPocoApplication::~HelloPocoApplication()':
    helloworld.cpp:(.text._ZN20HelloPocoApplicationD2Ev[_ZN20HelloPocoApplicationD5Ev]+0x1f): undefined reference to `Poco::Util::Application::~Application()'
    /tmp/ccFvl4ll.o:(.rodata._ZTI20HelloPocoApplication[_ZTI20HelloPocoApplication]+0x10): undefined reference to `typeinfo for Poco::Util::Application'
    collect2: error: ld returned 1 exit status

你能帮帮我吗？

c++

来源：https://stackoverflow.com/questions/37345130/poco-library-linking-errors-in-ubuntu-platform

4条答案

按热度按时间

62lalag41#

我设法运行了完全相同的代码，但使用的是Cmake而不是Makefile，它工作了。你只需要根据你的机器更改路径。
下面是我的CMakeLists.txt：

cmake_minimum_required(VERSION 2.8.3)
project(tutocpp14)

set(Poco_DIR "/usr/local/lib/cmake/Poco/") 
set(Poco_INCLUDE_DIRS "/usr/include/Poco/")

find_package(Poco REQUIRED COMPONENTS Foundation Net XML Util) # add other components here

# check c++11 / c++0x
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11 " COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
if(COMPILER_SUPPORTS_CXX11)
    set(CMAKE_CXX_FLAGS "-std=c++11")
elseif(COMPILER_SUPPORTS_CXX0X)
    set(CMAKE_CXX_FLAGS "-std=c++0x")
else()
    message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
endif()

include_directories( ${Poco_INCLUDE_DIRS}) 

add_executable(publisher src/publisher.cpp)
target_link_libraries(publisher ${Poco_LIBRARIES})

干杯，

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z4bn682m2#

检查Poco文档，它似乎应该工作。查看示例here及其makefile，我怀疑您的库的顺序颠倒了。假设路径正确（因为ld没有报告），我会说链接顺序不正确。See here为什么。所以我建议您将命令更改为
第一个月
万一这些例子在将来不知何故超出了范围，这里是复制的代码和makefile。

#include <iostream>
#include <Poco/Util/Application.h>

class HelloPocoApplication : public Poco::Util::Application
{
protected:
    virtual int main(const std::vector<std::string> &args)
    {
        std::cout << "Hello, POCO C++ Libraries!" << std::endl;

        return EXIT_OK;
    }
};

POCO_APP_MAIN(HelloPocoApplication);

- 注意：**记住在makefile代码中恢复制表符而不是空格!

POCO_LIBS=-lPocoFoundation -lPocoUtil

all: hello-poco

clean:
    rm -f hello-poco

hello-poco: hello-poco.cpp
    $(CXX) $(POCO_LIBS) -o hello-poco hello-poco.cpp

- 更新日期：**

综上所述，我必须注意你的错误的奇怪之处，特别是在foundation库中发现的Poco：：Logger。所以看起来库没有得到链接。我建议两件事：1.检查它是否已损坏。您可以通过清理和重新编译来做到这一点2.尝试在标准路径中安装，以避免链接路径
我知道所有这些都不是确定的（猜测最好），但将有助于为您提供问题所在的提示。

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chy5wohz3#

你最初的库链接顺序是正确的，但是你缺少了XML和JSON（Util依赖于这些库）。尽管如此，你得到的链接错误表明你可能缺少了Foundation库或者混合了库的版本。

$ echo $POCO_BASE
/tmp/poco
$ pwd
/tmp/poco/test
$ g++ -I $POCO_BASE/Util/include -I $POCO_BASE/Foundation/include -L $POCO_BASE/lib/Linux/x86_64 -lPocoUtil -lPocoXML -lPocoJSON -lPocoFoundation helloworld.cpp -o prog

赞(0）回复(0）举报 2022-12-27

nx7onnlm4#

尝试这个命令编译。
g++<src_file>.cpp -lPoco基础-lPocoJSON -lPoco实用程序-lPocoJWT -o<binary_name>

赞(0）回复(0）举报 2022-12-27