Linker Tasks

Using Linker commands

Specifying a Path List with +b

The syntax of the +b option is

+b path_list

where path_list is the list of directories you want the dynamic loader to search at run time. For example, the following linker command causes the path .:/app/lib:: to be stored in the executable. At run time, the dynamic loader would search for libfoo.sl, libm.sl, and libc.sl in the current working directory (.), the directory /app/lib, and lastly in the location in which the libraries were found at link time (::):

$ ld /opt/langtools/lib/crt0.o +b .:/app/lib:: prog.o -lfoo \ -lm -lc

If path_list is only a single colon, the linker constructs a path list consisting of all the directories specified by -L, followed by all the directories specified by the LPATH environment variable. For instance, the following linker command records the path list as /app/lib:/tmp:

$ LPATH=/tmp ; export LPATH

$ ld /opt/langtools/lib/crt0.o +b : -L/app/lib prog.o -lfoo \ -lm -lc

The Path List

Whether specified as a parameter to +b or set as the value of the SHLIB_PATH environment variable, the path list is simply one or more path names separated by colons (:), just like the syntax of the PATH environment variable. An optional colon can appear at the start and end of the list.

Absolute and relative path names are allowed. Relative paths are searched relative to the program's current working directory at run time.

Remember that a shared library's full path name is stored in the executable. When searching for a library in an absolute or relative path at run time, the dynamic loader uses only the basename of the library path name stored in the executable. For instance, if a program is linked with /usr/local/lib/libfoo.sl, and the directory path list contains /apps/lib:xyz, the dynamic loader searches for /apps/lib/libfoo.sl, then ./xyz/libfoo.sl.

The full library path name stored in the executable is referred to as the default library path. To cause the dynamic loader to search for the library in the default location, use a null directory path (). When the loader comes to a null directory path, it uses the default shared library path stored in the executable. For instance, if the directory path list in

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Kenwood HP 9000 manual Specifying a Path List with +b

HP 9000 specifications

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