The syntax is wrong. You should do g++ -Wall -o test test.o -L /usr/local/lib -lboost_program_options -L for the location, -l for the library file's name (dropping the lib at the beginning and the .so at the end), and preferably without space between -l and the library's name. assuming "/usr/local/lib/libboost_program_options.so" is a link to the library file. Tamas Hegedus wrote:

Hi,

I am newbie to c/cpp and I have linking and/or loading shared library problem.

I can not link with dynamic libraries.

Thanks for your help in advance, Tamas

*** 1 *** [violin]$ ldconfig -p | grep libboost_program_options libboost_program_options.so.1 (libc6) => /usr/lib/libboost_program_options.so.1

*** 2 *** As I do not have the file /usr/lib/libboost_program_options.so.1 I created a link: libboost_program_options.so.1 -> libboost_program_options-gcc-1_33_1.so.1.33.1

*** 3 *** Compiling my src file [violin]$ g++ -Wall -I /usr/local/include/boost-1_33_1 -c test.cpp

*** 4A *** [violin]$ g++ -Wall -o test test.o /usr/local/lib/libboost_program_options-gcc-1_33_1.so.1.33.1

[violin]$ ./test ./test: error while loading shared libraries: libboost_program_options-gcc-1_33_1.so.1.33.1: cannot open shared object file: No such file or directory

*** 4B *** [violin]$ g++ -Wall -o test test.o /usr/local/lib/libboost_program_options.so.1

[violin]$ ./test

./test: error while loading shared libraries: libboost_program_options-gcc-1_33_1.so.1.33.1: cannot open shared object file: No such file or directory

*** 4C *** [violin]$ g++ -Wall -o test test.o /usr/local/lib/libboost_program_options-gcc-1_33_1.a

[violin]$ ./test Compression level was not set.