在Iinux OS（定制板）上运行的应用程序不会从导出的LD_LIBRARY_PATH中读取共享库

Question

I am trying to run an application ( a.out ), very small application contains only one print statement) on Linux OS custom board which is not having the shared libs in /lib or /usr/lib .

So I am exporting the shared libs path using LD_LIBRARY_PATH

export LD_LIBRARY_PATH=/media/opensourcelib/toolchainLib/ramfslib

I made sure, shared libraries are in this path /media/opensourcelib/toolchainLib/ramfslib

Still, after this, when I execute a.out I get the error

/bin/sh: ./../usr/lib/a.out: not found

If I copy my shared libs to /lib , the application works fine.

But I need to make it work without copying the shared libs. Please help me, what could be the issue in exporting LD_LIBRARY_PATH .

Answer 1

I would do the following things:

1. Check that the path is correct. Maybe an uppercase or lowercase letter or any other misspelling mistake. Try ls /media/opensourcelib/toolchainLib/ramfslib , before any other thing, and check that the library is there.
2. Check that the necessary soft links exist into the path for the LD_LIBRARY_PATH. This is one of the things that do ldconfig . Maybe for your libmylib.so.1.5.8 you will find the links libmylib.so.1.5 , libmylib.so.1 and libmylib.so .
3. Check the library dependencies with ldd a.out .
4. If you have strace installed into the system (if not, I recommend to compile it for your board and copy it to your board), try to launch it exporting previously LD_LIBRARY_PATH and verify the paths are tried to read (and a many other things).

I hope it could be helpful.