cannot open shared object file: No such file or directory error while there is file

Question

I try to create shared library and compile my main.c with this library

I follow this web site : http://www.yolinux.com/TUTORIALS/LibraryArchives-StaticAndDynamic.html

I give these commands :

gcc -fPIC -c *.c
gcc -shared -Wl,-rpath,/opt/lib -Wl,-soname,libctest.so.1 -o libctest.so.1.0   *.o
sudo mv libctest.so.1.0 /opt/lib
sudo ln -sf /opt/lib/libctest.so.1.0 /opt/lib/libctest.so
sudo ln -sf /opt/lib/libctest.so.1.0 /opt/lib/libctest.so.1
gcc -Wall -L/opt/lib main.c -lctest -o prog

Commands gave no error. When I execute binary file ./prog it gives ./prog: error while loading shared libraries: libctest.so.1: cannot open shared object file: No such file or directory

but libctest.so.1 is in /opt/lib

lrwxrwxrwx 1 root  root    24 Aug 18 17:06 libctest.so -> /opt/lib/libctest.so.1.0
lrwxrwxrwx 1 root  root    24 Aug 18 17:06 libctest.so.1 -> /opt/lib/libctest.so.1.0
-rwxr-xr-x 1 user  user  7064 Aug 18 17:05 libctest.so.1.0

Also ldd prog is

linux-vdso.so.1 (0x00007ffe0f559000)
libctest.so.1 => not found
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fcd27fc6000)
/lib64/ld-linux-x86-64.so.2 (0x00007fcd28371000)

so what is wrong ?

I used debian 8.5 and gcc 4.9.2

You could use the linker -rpath option to specify additional places where the executable is to search for libraries, rather than moving them around.... — gilez
– gilez, Commented Aug 18, 2016 at 14:44
Thank you @gilez rpath solved my problem. If you post ypur comment as an answer, I will accept. — utarid
– utarid, Commented Aug 23, 2016 at 15:05
I expanded my comment into an answer, but as I said, I'm a bit confused now. Are you still having problems, or is this all working? — gilez
– gilez, Commented Aug 24, 2016 at 17:58
I edited my answer a bit, hoping I'm not actually confused any more :-) — gilez
– gilez, Commented Aug 24, 2016 at 18:10

gilez · Accepted Answer · 2016-08-24 18:09:34Z

5

GCC's ld command has an --rpath option that may solve your problems:

-rpath=dir
       Add a directory to the runtime library search path.

You should add the location of your compiled library to GCC's command line when you compile prog, via the -wl option:

-Wl,option
       Pass option as an option to the linker. If option contains commas,
       it is split into multiple options at the commas.

So your search path already includes /opt/lib because of the original creation of the library:

-Wl,-rpath,/opt/lib

For the second compile, add the location of libctest.so.1.0 as another rpath, and it should be found without your needing to move files around:

gcc -Wall -L/opt/lib main.c -lctest -Wl,-rpath,/you/dir/name -o prog

I think your original effort is failing as the linker has included a hard path to your original outout dir, and then you moved the library from under it.

edited Aug 24, 2016 at 18:09

answered Aug 24, 2016 at 17:56

gilez

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Mustafa DOGRU · Accepted Answer · 2016-08-18 14:25:12Z

2

Try adding /opt/lib to LD_LIBRARY_PATH as below;

LD_LIBRARY_PATH=/opt/lib

answered Aug 18, 2016 at 14:25

Mustafa DOGRU

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1 Comment

Employed Russian Over a year ago

Setting LD_LIBRARY_PATH has distinct drawback of "polluting" all child processes. When you are in control of the final link, a much better solution is to add -Wl,-rpath=/opt/lib to the link command instead.

Hung · Accepted Answer · 2017-03-08 09:53:55Z

1

I have a same proplem with iccxml

iccToXml profile.icc profile.xml

When i convert *.icc to *.xml by above code, i recived same message: cannot open shared object file: No such file or directory, Detail:

iccToXml: error while loading shared libraries: libIccXML.so.2: cannot open shared object file: No such file or directory

I resolved by use this command before convert

export LD_LIBRARY_PATH="/usr/local/lib"

You can replace "/usr/local/lib" by path of application file that you want.

Wish that is should helpfull for you.

answered Mar 8, 2017 at 9:53

Hung

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