Impossible to install shared library with .so file

Question

I'm not able to install this library on Ubuntu, or at least to compile a .cpp linking the library to it. I have finish all Google and StackOverflow answers.

So ok, first of all I run cmake and after I run make (and make install to be sure). Still, if I run g++ xxx.cpp -lcrb -o test I get this error: fatal error: CRNB.h: No such file or directory. The library doesn't like to be installed yet, so I copy the libcrn.so file to /usr/lib and I run sudo ldconfig to load it. Now...

• sudo ldconfig -n -v /usr/lib/ says it's properly installed (not before copying the .so file).
• g++ -lcrn says it's properly installed because returns undefined reference to 'main' and not cannot find -lcrn (as before copying the .so file)
• ldd /bin/ls doesn't list the library, which means it's not installed

Anyways, trying to compile still throws the same error. I have also tried...

• ... to create a .conf file and add it to the folder /etc/ld.so.conf.d/
• ... to creaty a symbolic link of the .so file to /usr/lib
• ... to repeat all this solutions also in /usr/local/lib and in /lib folders
• ... to add all this folders to the /etc/ld.so.conf paths
• ... to export LD_LIBRARY_PATH to the path of the .so file

And many more similar. As you can see all this things are the same, so it's clear that I'm losing something important. Anyone knows what it could be?

Thanks a lot!

Answer 1

You need to specify with "-I" flag the include directories, or import it to your system.

Try:

g++ src_name.cpp -L./your/library -lcrn -I./your/headers -o out_name -std=c++11

Or:

You can copy from libcrn include files ("*.h") to "/usr/local/include/" and the library to "/usr/local/lib/" if doesn't exist, and then:

g++ src_name.cpp -lcrn -o out_name -std=c++11