Linux 错误：ld.so：无法预加载对象 LD_PRELOAD：忽略
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ERROR: ld.so: object LD_PRELOAD cannot be preloaded: ignored
提问by lulyon
I am using ubuntu 12.04. Every time I start my bash terminal and every time when I finish typing a command(and press enter) , I get this message:
我正在使用 ubuntu 12.04。每次我启动我的 bash 终端以及每次我完成输入命令（并按 Enter）时，我都会收到以下消息：
ERROR: ld.so: object '/usr/lib/liblunar-calendar-preload.so' from LD_PRELOAD cannot be preloaded: ignored.
错误：ld.so：无法预加载来自 LD_PRELOAD 的对象“/usr/lib/liblunar-calendar-preload.so”：忽略。
It is weird. So what is the environment variable LD_PRELOAD used for? And what is the going on behind the scene?
真奇怪。那么环境变量 LD_PRELOAD 是干什么用的呢？幕后发生了什么？
Thanks.
谢谢。
采纳答案by hetepeperfan
The linker takes some environment variables into account. one is LD_PRELOAD
链接器考虑了一些环境变量。一个是LD_PRELOAD
from man 8 ld-linux:
来自man 8 ld-linux：
LD_PRELOAD
A whitespace-separated list of additional, user-specified, ELF
shared libraries to be loaded before all others. This can be
used to selectively override functions in other shared
libraries. For setuid/setgid ELF binaries, only libraries in
the standard search directories that are also setgid will be
loaded.
Therefore the linker will try to load libraries listed in the LD_PRELOADvariable before others are loaded.
因此，链接器将尝试在加载其他库LD_PRELOAD之前加载变量中列出的库。
What could be the case that inside the variable is listed a library that can't be pre-loaded. look inside your .bashrcor .bash_profileenvironment where the LD_PRELOADis set and remove that library from the variable.
可能是在变量内部列出了一个无法预加载的库的情况。查看您的.bashrc或设置的.bash_profile环境LD_PRELOAD并从变量中删除该库。
回答by lulyon
Thanks for the responses. I think I've solved the problem just now.
感谢您的回复。我想我已经解决了刚才的问题。
Since LD_PRELOAD is for setting some library proloaded, I check the library that ld preloads with LD_PRELOAD, one of which is "liblunar-calendar-preload.so", that is not existing in the path "/usr/lib/liblunar-calendar-preload.so", but I find a similar library "liblunar-calendar-preload-2.0.so", which is a difference version of the former one.
由于 LD_PRELOAD 是为了设置一些预加载的库，我检查了 ld 用 LD_PRELOAD 预加载的库，其中之一是“liblunar-calendar-preload.so”，它不存在于路径“/usr/lib/liblunar-calendar- preload.so”，但我找到了一个类似的库“liblunar-calendar-preload-2.0.so”，它是前者的不同版本。
Then I guess maybe liblunar-calendar-preload.so was updated to a 2.0 version when the system updated, leaving LD_PRELOAD remain to be "/usr/lib/liblunar-calendar-preload.so". Thus the preload library name was not updated to the newest version.
然后我想也许 liblunar-calendar-preload.so 在系统更新时更新为 2.0 版本，而 LD_PRELOAD 仍然是“/usr/lib/liblunar-calendar-preload.so”。因此，预加载库名称未更新为最新版本。
To avoid changing environment variable, I create a symbolic link under the path "/usr/lib"
为了避免改变环境变量，我在路径“/usr/lib”下创建了一个符号链接
sudo ln -s liblunar-calendar-preload-2.0.so liblunar-calendar-preload.so
Then I restart bash, the error is gone.
然后我重新启动bash，错误消失了。
回答by Einar
If you want to make sure that the library is loaded if and only ifthe program lunar-calendar-gtkis launched, you can apply this:
如果您想确保当且仅当程序lunar-calendar-gtk启动时才加载库，您可以应用：
You set the environment variable per command by prefixing the command with it:
您可以通过为命令添加前缀来设置每个命令的环境变量：
$ LD_PRELOAD="liblunar-calendar-preload.so" printenv "LD_PRELOAD"
liblunar-calendar-preload.so
$ printenv "LD_PRELOAD"
$
You can then choose to put this in a shell script and make lunar-calendar-gtka symlink to this shell script, replaceing the original referencee. This effectively makes sure that the library is loaded everytime the original application is executed.
然后你可以选择把它放在一个 shell 脚本中，并创建lunar-calendar-gtk一个到这个 shell 脚本的符号链接，替换原来的引用。这有效地确保每次执行原始应用程序时都加载库。
You will have to rename the original lunar-calendar-gtkto something else, which might not be too intriguing as it possibly may cause issues with uninstallation and upgrading. However, I found it useful with a former version of Skype.
您必须将原始文件重命名为lunar-calendar-gtk其他名称，这可能不会太吸引人，因为它可能会导致卸载和升级问题。但是，我发现它对以前版本的 Skype 很有用。
回答by purplesky
It means the path you input caused an error. In your LD_PRELOADcommand, modify the path like the error tips:
这意味着您输入的路径导致错误。在您的LD_PRELOAD命令中，像错误提示一样修改路径：
/usr/lib/liblunar-calendar-preload.so
回答by DaSqy Stc
You can check /etc/ld.so.preloadfile content
您可以检查/etc/ld.so.preload文件内容
I fix it by:
我通过以下方式修复它：
echo "" > /etc/ld.so.preload
echo "" > /etc/ld.so.preload
