Using an Environment Variable
You can also use the environment
variable LD_LIBRARY_PATH
to add to
the link-editor's library search path. Typically,
LD_LIBRARY_PATH
takes a
colon-separated list of directories. In its most
general form, LD_LIBRARY_PATH
can
also take two directory lists separated by a
semicolon. These lists are searched before and after
the -Y
lists supplied on the command
line.
The following example shows the combined effect of
setting LD_LIBRARY_PATH
and calling
the link-editor with several -L
occurrences.
$ LD_LIBRARY_PATH=dir1:dir2;dir3 $ export LD_LIBRARY_PATH $ cc -o prog main.c -Lpath1 .... -Lpath2 .... -Lpathn -lfoo
The effective search path is
dir1:dir2:path1:path2:....:pathn:dir3:/lib:/usr/lib
.
If no semicolon is specified as part of the
LD_LIBRARY_PATH
definition, the
specified directory list is interpreted
after any -L
options. In the following example, the effective
search path is
path1:path2:....:pathn:dir1:dir2:/lib:/usr/lib
.
$ LD_LIBRARY_PATH=dir1:dir2 $ export LD_LIBRARY_PATH $ cc -o prog main.c -Lpath1 .... -Lpath2 .... -Lpathn -lfoo
Note:
This environment variable can also be used to augment the search path of the runtime linker. See Directories Searched by the Runtime Linker. To prevent this environment variable from influencing the link-editor, use the-i
option.