设置用于在运行时加载共享库的LD_LIBRARY_PATH环境变量（g ++） [英] Setting LD_LIBRARY_PATH environment variable for loading a shared library at runtime (g++)

问题描述

我有两个相同问题的问题：

1. 我有一个共享对象保存在`pwd` / lib，而使用它的可执行文件成功编译（通过使用-l和-L开关），在运行时它给我的悲伤。如果我尝试运行 LD_LIBRARY_PATH = / my / absolute / path / to / library / directory ./test 它工作正常。但是如果我导出LD_LIBRARY_PATH = / my / absolute / path /到/ library /目录，并且执行 ./ test ，它表示它找不到共享库。但是，如果我执行 LD_LIBRARY_PATH = $ LD_LIBRARY_PATH ./test 再次它工作正常！关于我做错什么的任何想法？




2. 第二个问题与导出LD_LIBRARY_PATH env变量有关。如果我打开一个终端，输入导出LD_LIBRARY_PATH = / path / to / stuff 然后键入 echo $ LD_LIBRARY_PATH 变量是正确的。但是，如果我写一个包含导出命令的脚本，只需运行它就不会更新变量，而是需要运行 source install.sh ，以便实际保持变量。这是最好的解决方案？

谢谢你的时间！

解决方案

首先回答第二个问题：

source 执行当前shell中的脚本， ./ install.sh 打开并在不同的shell中执行。
http：/ /www.unix.com/unix-dummies-questions-answers/537-difference-between-source-exec-script.html

现在为您的第一个问题：

LD_LIBRARY_PATH = $ LD_LIBRARY_PATH ./test 在只有一个命令之前设置LD_LIBRARY_PATH变量（ ./ test 命令）。由于上述相同的原因，我相信这没有被转移到任何shell ./ test 创建。要使其持续存在，您可能需要将导出LD_LIBRARY_PATH = ... 放在您的〜/ .bashrc / p>

I'm having two problems related to the same issue:

1. I have a shared object saved in `pwd`/lib and while the executable that uses it compiles successfully (by using -l and -L switches), at runtime, it's giving me grief. If I try to run LD_LIBRARY_PATH=/my/absolute/path/to/library/directory ./test it works fine. But if I export LD_LIBRARY_PATH=/my/absolute/path/to/library/directory and do ./test it says that it can't find the shared library. However, if I do LD_LIBRARY_PATH=$LD_LIBRARY_PATH ./test again it works fine!! Any ideas on what I'm doing wrong?

2. Second issue is related to the exporting of the LD_LIBRARY_PATH env variable. If I open a terminal and type export LD_LIBRARY_PATH=/path/to/stuff and then type echo $LD_LIBRARY_PATH, the variable is correct. However if I write a script containing the export command, simply running it doesn't update the variable, instead I need to run source install.sh in order to actually persist the variable. What's the best solution for this?

Thank you for your time!

解决方案

To answer the second question first:

source executes the script inside the current shell, ./install.sh opens and executes it in a different shell. http://www.unix.com/unix-dummies-questions-answers/537-difference-between-source-exec-script.html

Now for your first question:

LD_LIBRARY_PATH=$LD_LIBRARY_PATH ./test sets the LD_LIBRARY_PATH variable before just one command (the ./test command). For the same reason above, I believe this isn't getting transferred to whatever shell ./test creates. To make it persist, you may need to put the export LD_LIBRARY_PATH=... in your ~/.bashrc

这篇关于设置用于在运行时加载共享库的LD_LIBRARY_PATH环境变量（g ++）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！