dld.sl.5 (2010 09)

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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 pro-

gram or loaded shared libraries with no embedded

/ character. Dynamic path searching is enabled by

default for these standard mode libraries or executables.

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

followed 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

2 Hewlett-Packard Company − 2 − HP-UX 11i Version 3: September 2010