dlopen() returns undefined symbol for library w/ RTLD_LAZY

[Davidzeu <davidzeu at gmail dot com>]

Hi all,

I have been facing this issue, when I try to use the 'dlopen()'  to
load a library (libtest.so) in my exe, I get an "undefined symbol"
error. I use the "dlopen" with the flag 'RTLD_LAZY'.

I have been using the same source code(both for the main exe and the
library 'libtest.so') in another machine. There was no issue in that
machine. I think it might be something to do with the 'g++' flags I
use to get the library file ('libtest.so'). But I am not sure.

The GCC and linux versions of the new machine in which I faced the
issue are,
---------------------------------------------------------------------------------------------------------------------------
$ lsb_release -a
LSB Version:    1.3
Distributor ID: RedHatEnterpriseAS
Description:    Red Hat Enterprise Linux AS release 3 (Taroon Update
6)
Release:        3
Codename:       TaroonUpdate6

$gcc --version
gcc (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-53)

-----------------------------------------------------------------------------------------------------------
the makefile entry for the main program linking is..
g++ -o ../run/main main.o -Wl,--export-dynamic  -L/usr/local/lib
-L/home/user/lib -ldl -lnsl -lpthread -lrt

the makefile entry for the library file (libtest.so) is,
libtool --mode=link g++ -shared -o ../run/libtest.so test.o config.o


I dint change the makefile entries that were from the old machine,
since it compiled successfully. For your information, my old machine's
linux and GCC version details are,
-------------------------------------------------------------------------------------------------------------

$ lsb_release -a
LSB Version:    1.3
Distributor ID: RedHat
Description:    Red Hat Linux release 9 (Shrike)
Release:        9
Codename:       Shrike

$ gcc --version
gcc (GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)

---------------------------------------------------------------------------------------------------------------


thanks for any kind of help or pointers!


--david
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