Linux Error While Loading Shared Libraries: Cannot Open Shared Object File: No Such File or Directory

Question

Program is part of the Xenomai test suite, cross-compiled from Linux PC into Linux+Xenomai ARM toolchain.

# echo $LD_LIBRARY_PATH                                                                                                                                          
/lib                                                                                                                                                             
# ls /lib                                                                                                                                                        
ld-2.3.3.so         libdl-2.3.3.so      libpthread-0.10.so                                                                                                       
ld-linux.so.2       libdl.so.2          libpthread.so.0                                                                                                          
libc-2.3.3.so       libgcc_s.so         libpthread_rt.so                                                                                                         
libc.so.6           libgcc_s.so.1       libstdc++.so.6                                                                                                           
libcrypt-2.3.3.so   libm-2.3.3.so       libstdc++.so.6.0.9                                                                                                       
libcrypt.so.1       libm.so.6                                                                                                                                    
# ./clocktest                                                                                                                                                    
./clocktest: error while loading shared libraries: libpthread_rt.so.1: cannot open shared object file: No such file or directory

Edit: OK I didn't notice the .1 at the end was part of the filename. What does that mean anyway?

Accepted Answer

Your library is a dynamic library. You need to tell the operating system where it can locate it at runtime.

To do so, we will need to do those easy steps:

Find where the library is placed if you don't know it.
```
sudo find / -name the_name_of_the_file.so
```
Check for the existence of the dynamic library path environment variable(LD_LIBRARY_PATH)
```
echo $LD_LIBRARY_PATH
```
If there is nothing to be displayed, add a default path value (or not if you wish to)
```
LD_LIBRARY_PATH=/usr/local/lib
```
We add the desired path, export it and try the application.

Note that the path should be the directory where the path.so.something is. So if path.so.something is in /my_library/path.so.something, it should be:
```
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/my_library/
export LD_LIBRARY_PATH
./my_app
```

Reference to source

Answer 2

Here are a few solutions you can try:

Must Read

ldconfig

As AbiusX pointed out: If you have just now installed the library, you may simply need to run ldconfig.

sudo ldconfig

ldconfig creates the necessary links and cache to the most recent shared libraries found in the directories specified on the command line, in the file /etc/ld.so.conf, and in the trusted directories (/lib and /usr/lib).

Usually your package manager will take care of this when you install a new library, but not always, and it won't hurt to run ldconfig even if that is not your issue.

Linux Error While Loading Shared Libraries: Cannot Open Shared Object File: No Such File or Directory

21 Answers

Must Read

ldconfig

Chloe Bennett