Question

Thank you guys answering my previous problem on undefined reference to function. As you suggested, the reason under the problem is not linking the libraries. Now I have generated the executable file with: (the version of my g++ and gcc is 4.4.5. I am using Ubuntu 10.10.)

g++ -o ex_addinst  ./ex_addinst.o -L/home/li/work/tools/lindo/lindoapi/bin/linux64 -m64 -llindo64  -lmosek64 -lconsub3 -lc -ldl -lm -lguide -lpthread -lsvml -limf -lirc

But there comes another problem, when I run the executable file with

./ex_addinst

errors appear: (I am not sure I should start a new problem or not currently….)

./ex_addinst: error while loading shared libraries: liblindo64.so.6.0: cannot open shared object file: No such file or directory

But liblindo64.so.6.0 exists in the folder of the lib ~/lindoapi/bin/linux64 which contains following files:

libconsub3.so  libirc.so          liblindojni.so        libmosek64.so.5.0  lindo.par
libguide.so    liblindo64.so      liblindojni.so.6.0.3  libsvml.so         placeholder
libimf.so      liblindo64.so.6.0  libmosek64.so         lindoapivars.sh    runlindo

I have created a symbolic link between liblindo.so.6.0 and liblindo.so:

ln -sf liblindo64.so.6.0 liblindo64.so

There is ‘-llindo64’ is the g++ command, so I thought liblindo64.so.6.0 should have been linked.
I have tried to change -L to -Llib, but doesn’t help.

Can anyone tell me what is wrong here? Thanks!

Answer 1

You need to have the directory where the .so files live in in runtime linker’s search path.

You can do that by changing the LD_LIBRARY_PATH environment variable like this:

export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:$HOME/lindoapi/bin/linux64

before starting your executable.