HP-UX Linker and Libraries User's Guide
In the above example, if you type:
$ ld main.o -L. -lbar -lc
$ mv libme.so /var/tmp
instead of:
$ mv libme.so /var/tmp
$ ld main.o -L. -lbar -lc
the linker finds libme.so in ./ at link time, and the dynamic loader finds libme.so in
/var/tmp at run time. At run time, the dynamic loader searches paths to resolve external references
made by main in the following order:
1. ./libc.so not found /usr/lib/hpux32/libc.so found
2. SHLIB_PATH to find libbar.so not found
3. ./libbar.so (./libbar.so) found
4. LD_LIBRARY_PATH to find libme.so not found
5. SHLIB_PATH to find libme.so not found
6. /var/tmp/libme.so found
7. LD_LIBRARY_PATH to find libc.so not found
8. SHLIB_PATH to find libc.so not found
9. LD_LIBRARY_PATH to find libbar.so not found
Library Example: Linking to Libraries with +b path_list in PA-32 Mode
This example is the same as “Library Example: Linking to Libraries with +b path_list in IPF/PA-64
Mode” (page 134), but this time the program is compiled in PA-32 mode.
$ cc -c +DD32 me.c bar.c main.c
$ ld -b me.o -o libme.so
$ ld +compat -b bar.o -o libbar.so -L. -lme +b /var/tmp \PA-32 mode library created
$ ld main.o -L. -lbar -lc
$ mv libme.so /var/tmp
When linking main.o, the link order is:
1. ./libbar.so found
2. ./libme.so found
3. ./libc.so not found
4. /usr/lib/libc.so found
In the above example, if you type:
$ mv libme.so /var/tmp
$ ld main.o -L. -lbar -lc
instead of:
$ ld main.o -L. -lbar -lc
$ mv libme.so /var/tmp
the linker issues the following error message:
ld: Can't find dependent library ./libme.so
Fatal Error
The linker does not look in /var/tmp to find shared libraries because in PA-32 mode the directories
specified by +b pathname are only searched at run time. Because libme.so is specified with
the -l option, it is subject to dynamic path searching. At run time, the dynamic loader looks for
shared libraries used by main in the following order:
1. ./libbar.so found
2. /var/tmp/libme.so found
3. /libc.so not found
4. /usr/lib/libc.so found
Using Shared Libraries in Default Mode 135