LDCONFIG(8)                         Linux Programmer's Manual                         LDCONFIG(8)



NAME
       /sbin/ldconfig - configure dynamic linker run time bindings

SYNOPSIS
       /sbin/ldconfig [ -nNvXV ] [ -f conf ] [ -C cache ] [ -r root ] directory ...
       /sbin/ldconfig -l [ -v ] library ...
       /sbin/ldconfig -p

DESCRIPTION
       ldconfig  creates  the necessary links and cache to the most recent shared libraries found
       in the directories specified on the command line, in the file /etc/ld.so.conf, and in  the
       trusted  directories (/lib and /usr/lib).  The cache is used by the run-time linker, ld.so
       or ld-linux.so.  ldconfig checks the header and file names of the libraries it  encounters
       when determining which versions should have their links updated.

       ldconfig  will  attempt to deduce the type of ELF libs (ie. libc5 or libc6/glibc) based on
       what C libs, if any, the library  was  linked  against.  Therefore,  when  making  dynamic
       libraries, it is wise to explicitly link against libc (use -lc).

       Some existing libs do not contain enough information to allow the deduction of their type.
       Therefore, the /etc/ld.so.conf file format allows the specification of an  expected  type.
       This  is  only  used  for  those  ELF  libs  which  we  can  not  work  out. The format is
       "dirname=TYPE", where TYPE can be libc4, libc5, or libc6.  (This syntax also works on  the
       command line.)  Spaces are not allowed.  Also see the -p option.  ldconfig should normally
       be run by the super-user as it may require write permission on some root owned directories
       and files.

OPTIONS
       -v     Verbose  mode.   Print  current version number, the name of each directory as it is
              scanned, and any links that are created.  Overrides quiet mode.

       -n     Only process directories specified on the command line.  Don't process the  trusted
              directories  (/lib  and  /usr/lib) nor those specified in /etc/ld.so.conf.  Implies
              -N.

       -N     Don't rebuild the cache.  Unless -X is also specified, links are still updated.

       -X     Don't update links.  Unless -N is also specified, the cache is still rebuilt.

       -f conf
              Use conf instead of /etc/ld.so.conf.

       -C cache
              Use cache instead of /etc/ld.so.cache.

       -r root
              Change to and use root as the root directory.

       -l     Library mode. Manually link individual libraries. Intended for use by experts only.

       -p     Print the lists of directories and candidate libraries stored in the current cache.


FILES
       /lib/ld.so          run-time linker/loader
       /etc/ld.so.conf     File containing a  list  of  colon,  space,  tab,  newline,  or  comma
                           spearated directories in which to search for libraries.
       /etc/ld.so.cache    File  containing an ordered list of libraries found in the directories
                           specified in /etc/ld.so.conf.



GNU C Library                               2002-05-06                                LDCONFIG(8)