HP-UX Reference (11i v2 07/12) - 5 Miscellaneous (vol 9)

d
dld.sl(5)
PA-RISC Systems Only
dld.sl(5)
The path list is a list of one or more path names separated by colons (
:). The dynamic path list will work
only for libraries specified with the
-l or -l: options to ld. However, it can be enabled for libraries
specified with a full path name using the
-l option to chatr (see chatr(1)). If both +s and +b are used,
their relative order on the command line indicates which path list will be searched first in compatibility
mode.
See the
+help option to ld(1) or the HP-UX Linker and Libraries User’s Guide manual for more details.
PA-RISC 64-bit Dynamic Path List
For standard mode libraries (libraries built or linked with
ld +std), the dynamic loader will use dynamic
path searching to find shared libraries whose names appear in the shared library list of the program or
loaded shared libraries with no embedded
/ character. Dynamic path searching is enabled by default for
these standard mode libraries or executables.
If
ld +noenvvar is specified, the dynamic loader will not look at any dynamic path environment vari-
ables to find dependent shared libraries. This limits the dynamic path searching to the value of
rpath and
the default directories
/usr/lib/pa20_64
and /usr/ccs/lib/pa20_64
.
For compatibility mode libraries (libraries built or linked with
ld +compat
), the dynamic loader will only
do dynamic path searching for these libraries if they were linked with
-l or -l: and one of these were
specified:
•
ld +s
• ld +b
• chatr +s enable
There are several ways to specify a dynamic path list :
• By storing a directory path list in the executable using the +b path_list option to
ld.
• By not specifying
ld +b and letting the linker set the rpath value to a concatenation of the
ld -L
path_list followed by the value of the environment variable LPATH followed by the default directories
/usr/lib/pa20_64 and
/usr/ccs/lib/pa20_64. This is for standard mode shared libraries
only.
• By storing a directory path list in the environment variables
LD_LIBRARY_PATH
and/or
SHLIB_PATH . For compatibility mode shared libraries and executables, the directory path_list should
only be put in the
SHLIB_PATH environment variable.
The path list is a list of one or more path names separated by colons (
:). The dynamic path list will work
only for libraries specified with the
-l or -l: options to ld. However, it can be enabled for libraries
specified with a full path name using the
-l option to chatr (see chatr(1)). If both
+s and +b are used,
their relative order on the command line indicates which path list will be searched first in compatibility
mode.
See the
+help option to ld(1) or the HP-UX Linker and Libraries User’s Guide manual for more details.
The dynamic loader will use these rules when determining which dynamic path list to use:
• If
ld +noenvvar was specified and ld +b and ld +compat were not specified, then the only
dynamic path searching that can be done is to look at the path list in
rpath
followed by the default
directories
/usr/lib/pa20_64 and /usr/ccs/lib/pa20_64
.
• If
ld +compat was specified and ld +b and ld +s were not specified, no shared library is subject
to dynamic path searching.
• If the ld +compat and ld +b options are not specified, then the path_list in the
LD_LIBRARY_PATH environment variable is searched, followed by the path_list in the SHLIB_PATH
environment variable, followed by the path_list in rpath, followed by the default directories
/usr/lib/pa20_64 and /usr/ccs/lib/pa20_64
.
• If the
ld +compat, ld +b, and ld +s are specified, then use the relative ordering of ld +b and
ld +s to determine if the dynamic loader should use the path_list in rpath before SHLIB_PATH fol-
lowed by the library as specified in the shared library list. If ld +b is specified first, use the path_list
in rpath first.
The rules change slightly when looking for dependent shared libraries.
• For standard mode libraries, the path_list in the LD_LIBRARY_PATH environment variable is
searched first, followed by the path_list in the SHLIB_PATH environment variable, followed by the
value in the parent shared library’s rpath, followed by the default directories /usr/lib/pa20_64
112 Hewlett-Packard Company − 2 − HP-UX 11i Version 2: December 2007 Update