在linux中链接错误 [英] Linking error in linux

问题描述

我是ubuntu 14.04 32位的新用户来做我的leddar项目。我还安装了所有必需的软件包（Qt，其他库）但是当我catkin_make所有内容时，有很多链接错误。直到现在我面临一些链接问题，而不是如何解决它。



以下是错误显示给我：



/home/darwin/catkin_ws/src/leddar/lib/libLeddar.so：未定义引用`QString :: toLocal8Bit_helper（QChar const *，int）'

/home/darwin/catkin_ws/src/leddar/lib/libLeddarC.so:对`QString :: toUtf8_helper（QString const&）的未定义引用'

collect2：错误：ld返回1退出状态

make [2]：*** [/ home / darwin / catkin_ws / devel / lib / leddartech / leddartech_node]错误1

make [1]：*** [ leddar / CMakeFiles / leddartech_node.dir / all]错误2

make：*** [all]错误2

调用make -j4 -l4失败





有没有人遇到过这种问题并分享你的解决方法？谢谢！



我尝试了什么：



这是网站我用来下载leddar软件包：https：//github.com/jpmerc/leddartech

解决方案

你好！



我知道它已经晚了，但我有完全相同的问题并且反过来解决了一点。



问题在于Qt的版本 - 5.2.0。

你应该以最困难的方式卸载previos Qt（我自己在linux上不好用，我使用了这个） [ ^ ]。



然后安装qt-opensource-linux-x64 -5.4.0.run来自

[ ^ ]



这一般都是。之后，符号链接有几个简单的问题，很容易修复。



我整天花在这个问题上，希望有一天能帮助））

您在链接器部分中缺少库引用。检查 QString :: toLocal8Bit_helper 和 QString :: toUtf8_helper 的文档，看看哪个是必需的。

我解决了我的问题。我只是重新安装我的Linux系统到64位然后下载这些Leddar SDK包和Leddar ROS包和Qt5然后一切都很好！我相信在32位系统中有一些包不可靠因此导致这么多问题。



谢谢大家的帮助！

I'm a new user in ubuntu 14.04 32 bit to do my leddar project.I have also installed all necessary packages (Qt, other libraries) but there are many linking errors when I catkin_make everything. And until to now I'm facing some linking problem and don't how to solve it.

follow is the error shows to me:

/home/darwin/catkin_ws/src/leddar/lib/libLeddar.so: undefined reference to `QString::toLocal8Bit_helper(QChar const*, int)'
/home/darwin/catkin_ws/src/leddar/lib/libLeddarC.so: undefined reference to `QString::toUtf8_helper(QString const&)'
collect2: error: ld returned 1 exit status
make[2]: *** [/home/darwin/catkin_ws/devel/lib/leddartech/leddartech_node] Error 1
make[1]: *** [leddar/CMakeFiles/leddartech_node.dir/all] Error 2
make: *** [all] Error 2
Invoking "make -j4 -l4" failed


Got anyone meet this kind of problem before and share your solving way? Thank you!

What I have tried:

this is the website i usd to download the leddar package:https://github.com/jpmerc/leddartech

解决方案

Hello!

I know it is late, but I've got exactly the same problem and solved it a little bit the other way.

The problem was in version of Qt - 5.2.0.
You shoul uninstall the previos Qt by the most hardest way (i am by myself not good in linux, i used this )[^].

And then installed qt-opensource-linux-x64-5.4.0.run from
[^]

That is all in general. After that there was several easy problems with symlink, which were repaired easily.

I spent on that problem a whole day, hope that helps one day))

You are missing a library reference in your linker section. Check the documentation for QString::toLocal8Bit_helper and QString::toUtf8_helper to see which one is required.

I had solve my problem. I just reinstall my linux system to 64bit then download these Leddar SDK package and Leddar ROS package and Qt5 then everything was fine! I believe there have some of the package was not reliable in 32bit system so cause so many problem.

And thank you for everyone's help!

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