ld.so.conf does not get loaded by ldconfig

Question

So I've edited my /etc/ld.so.conf file and now it looks like this:

include /opt/intel/mkl/lib/intel64_lin
include /etc/ld.so.conf.d/*.conf
include /usr/local/lib

I've tried running sudo ldconfig -v , but in the output it does not seem to even attempt to load the MKL library directory. When I try to run a program using MKL it fails. However, if I add a symbolic link to the correct library in /usr/local/lib which gets added from /etc/ld.so.conf.d/libc.conf it works. Obviously this is an easy solution, but I'm trying to understand why my ldconfig fails?

Answer 1

You have to add library or directory itself:

/full/Path/to/library.so/or/directory to /etc/ld.so.conf file

You must remove include word before directory in your config file.

From man ldconfig :

The ldconfig utility is used to prepare a set of ``hints'' for use by the dynamic linker to facilitate quick lookup of shared libraries available in multiple directories.
<...>

Files named on the command line are expected to contain directories to scan for shared libraries. Each directory's pathname must start on a new line. Blank lines and lines starting with the comment character `#' are ignored. Filenames must conform to the lib*.so.[0-9] pattern in order to be added to the hints file.