Gcc linker search path order Post: 302903163

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LEARN ABOUT LINUX

ldconfig

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

NAME

       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 filenames of the libraries it encounters when determining which versions should have their links
       updated.

       ldconfig will attempt to deduce the type of ELF libs (i.e., libc5 or libc6/glibc) based on what C libs, if  any,  the  library  was  linked
       against.

       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 used  only  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 superuser 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  speci-
	      fied 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-separated 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, as well as those
			   found in /lib and /usr/lib.

SEE ALSO

       ldd(1), ld.so(8)

COLOPHON

       This page is part of release 3.55 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2012-05-10							       LDCONFIG(8)