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?

Answer 1

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:

1. Find where the library is placed if you don't know it.

sudo find / -name the_name_of_the_file.so 

2. 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 

3. 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