8

我编写了一个 c++ 程序并尝试使用 curlpp 通过SSL. 问题是,我无法链接该程序。

操作系统:Ubuntu 15.10

错误:

/usr/bin/cmake -E cmake_link_script CMakeFiles/prtg_probe.dir/link.txt --verbose=1 Wird gelinkt prtg_probe (c++) CMakeFiles/prtg_probe.dir/probe.cpp.o: 在函数 curlpp::internal::OptionContainer , std::allocator >, std::allocator, std::allocator > > >

::OptionContainer(std::__cxx11::list, std::allocator >, std::allocator, std::allocator > > > const&)': /usr/include/curlpp/internal/OptionContainer.inl:38: 未定义引用 curlpp::internal::SList::SList(std::__cxx11::list, std::allocator >, std::allocator, std::allocator > > > const&)' CMakeFiles/prtg_probe.dir/probe。 cpp.o: 在函数 curlpp::internal::OptionContainer, std::allocator >, std::allocator, std::allocator > > ::setValue(std::__cxx11::list, std::allocator >, std::allocator, std::allocator > > > const&)': /usr/include/curlpp/internal/OptionContainer.inl:52: 未定义引用`curlpp::internal::SList::operator=(std:: __cxx11::list, std::allocator >, std::allocator, std::allocator > > >const&)' ....

这是产生错误的代码:

#include <iostream>
#include <sstream>
#include <string>
#include <cstring>
#include <cctype>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <cerrno>
#include <boost/bind.hpp>
#include <curlpp/cURLpp.hpp>
#include <curlpp/Easy.hpp>
#include <curlpp/Options.hpp>
#include <curlpp/Exception.hpp>

....

class myclass
{

....

try
{
    curlpp::Cleanup cleaner;
    curlpp::Easy request;
    ostringstream os;

    request.setOpt(new curlpp::options::Url(&url_announce[0]));
    request.setOpt(new curlpp::options::SslEngineDefault());
    list<string> header;
    header.push_back("Content-Type: text/*");
    request.setOpt(new curlpp::options::HttpHeader(header));
    request.setOpt(new curlpp::options::PostFields(data_announce));
    request.setOpt(new curlpp::options::PostFieldSize((long)data_announce.length()));
    request.setOpt(new curlpp::options::WriteStream(&os));
    request.perform();
    request_announce = os.str();
}
catch (curlpp::LogicError & e)
{
    syslog(LOG_DAEMON, "Error accessing PRTG server: %s", e.what());
}
catch (curlpp::RuntimeError & e)
{
    syslog(LOG_DAEMON, "Error accessing PRTG server: %s", e.what());
}

每一行在curlpp::options::...链接时都会产生一个错误。我已经环顾四周并搜索了几个小时,但我发现的只是将 libcurl 与 libcurl 链接在一起。我这样做了,但仍然得到这个错误。

这是完整的链接行:

/usr/bin/c++   -g    CMakeFiles/prtg_probe.dir/sensors.cpp.o 
CMakeFiles/prtg_probe.dir/mini_probe.cpp.o CMakeFiles/prtg_probe.dir/probe.cpp.o
CMakeFiles/prtg_probe.dir/helper.cpp.o 
CMakeFiles/prtg_probe.dir/config.cpp.o CMakeFiles/prtg_probe.dir/main.cpp.o
-o prtg_probe -rdynamic -lm -lpthread -lcrypto -lssl -lcurlpp -lcurl -lboost_system -lboost_filesystem -ljsoncpp -luuid

有人知道我错过了什么吗?我是否必须再添加一个库,如果是,是哪一个?


我尝试使用以下命令编译example00.cpp :

g++ -o example00 example00.cpp -lm -lcurl -lcurlpp

结果:

/tmp/cc3pcvDc.o: In Funktion `curlpp::OptionTrait<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, (CURLoption)10002>::updateHandleToMe(curlpp::internal::CurlHandle*) const':
example00.cpp: (.text._ZNK6curlpp11OptionTraitINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEL10CURLoption10002EE16updateHandleToMeEPNS_8internal10CurlHandleE[_ZNK6curlpp11OptionTraitINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEL10CURLoption10002EE16updateHandleToMeEPNS_8internal10CurlHandleE]+0x68):
Nicht definierter Verweis auf `curlpp::UnsetOption::UnsetOption(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/tmp/cc3pcvDc.o: In Funktion `curlpp::Option<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::getValue() const':
example00.cpp: (.text._ZNK6curlpp6OptionINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEE8getValueEv[_ZNK6curlpp6OptionINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEE8getValueEv]+0x68):
Nicht definierter Verweis auf `curlpp::UnsetOption::UnsetOption(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
collect2: error: ld returned 1 exit status

这对我来说似乎是同样的问题。

4

3 回答 3

9

问题是二进制文件ccurlcpp::UnsetOption::UnsetOption 中的链接存在部分缺陷。lipcurlcpp.so

链接器的投诉:

g++ -o example00 example00.cpp -lm -lcurl -lcurlpp

是:

undefined reference to `curlpp::UnsetOption::UnsetOption(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'

但是,如果我将构造函数签名分解为libcurlpp.so

nm -D -C libcurlpp.so | grep UnsetOption::UnsetOption

我懂了:

0000000000021776 T curlpp::UnsetOption::UnsetOption(char const*)
000000000002173e T curlpp::UnsetOption::UnsetOption(std::string const&)

由于std::string某种原因,没有正确地去类型定义。curlpp 0.7.3如果我从源包中获得定义此构造函数的源文件 ,请Exception.cpp编译它:

curlpp-0.7.3/src/curlpp$ g++ -I../../include -I. -c Exception.cpp

然后从目标文件中解构构造函数签名:

nm -C Exception.o | grep UnsetOption::UnsetOption

我得到:

00000000000003f4 T curlpp::UnsetOption::UnsetOption(char const*)
00000000000003c2 T curlpp::UnsetOption::UnsetOption(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)

所以:

curlpp::UnsetOption::UnsetOption(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)

是编译器告诉链接器要查找的签名,但这不是库中的签名。错误的简短解释是:库已损坏。

但是,我们看到这种不一致不会影响构造函数的其他重载:

curlpp::UnsetOption::UnsetOption(char const*)

也不可能,因为 thechar const *是内置类型。

这可以进行黑客修复。编译 undefined-reference 调用的文件是 (as installed) /usr/include/curlpp/Option.inl,位于以下行:

throw UnsetOption(std::string("You are trying to set an unset option to a handle"));

以 root 身份编辑此文件,您会看到它(不一致地)包含以下两个实例:

throw UnsetOption(std::string("blah blah"));

和一个实例:

throw UnsetOption("blah blah");

将 的出现更改UnsetOption(std::string("blah blah"))UnsetOption("blah blah")。然后在这个文件中只调用好的构造函数example00,并且至少会编译和链接。

如果您不喜欢 hack,或者发现问题在其他地方重新出现,那么您可以下载 ubuntu 源包curlpp_0.7.3.orig.tar.gz 并自己构建和安装。这是正确的补救措施。

于 2015-11-03T18:18:59.850 回答
5

您可以尝试使用旧 ABI 编译您的项目:
g++ -o example00 example00.cpp -D_GLIBCXX_USE_CXX11_ABI=0 -lm -lcurl -lcurlpp

于 2017-06-01T11:47:55.193 回答
0

对我来说,以下适用于 Ubuntu 18.04:

apt-get install libcurl4-openssl-dev
apt-get install libcurlpp-dev

制作:

...
add_executable(HTTPPostTest HTTPPostTest.cpp)
TARGET_LINK_LIBRARIES(HTTPPostTest -lcurl -lcurlpp stdc++fs )
...

HTTPPostTest.cpp:

#include <curlpp/cURLpp.hpp>
#include <curlpp/Easy.hpp>
#include <curlpp/Options.hpp>
#include <curlpp/Exception.hpp>

int main(int argc, char *argv[]) {
    try {
        curlpp::Cleanup cleaner;
        curlpp::Easy request;
        request.setOpt(new curlpp::options::Url("https://postman-echo.com/post"));
        request.setOpt(new curlpp::options::Verbose(true));
        std::list<std::string> header;
        header.push_back("Content-Type: application/octet-stream");
        request.setOpt(new curlpp::options::HttpHeader(header));
        request.setOpt(new curlpp::options::PostFields("abcd"));
        request.setOpt(new curlpp::options::PostFieldSize(5));
        request.perform();
    } catch ( curlpp::LogicError & e ) {
        std::cout << e.what() << std::endl;
    } catch ( curlpp::RuntimeError & e ) {
        std::cout << e.what() << std::endl;
    }
    return EXIT_SUCCESS;
}
于 2019-10-30T09:35:02.513 回答