Changing executable dependency

Linux and Unix-Like Emergency UNIX and Linux Support
1

hello,

can anyone help in changing the executable dependency on a certain shared library. eg, .. say i am having an executable by name utest. when i run UNIX ldd command on it then it shows the libraries on which it depends as follows:

ldd release/utest
release/utest needs:
         /usr/lib/libxnet.a(shr_64.o)
         /usr/lib/libpthread.a(shr_xpg5_64.o)
         /usr/lib/libdl.a(shr_64.o)
         /usr/lib/libC.a(shr_64.o)
         /usr/java6//jre/bin/classic//libjvm.so

Clearly it shows dependency on /usr/java6//jre/bin/classic//libjvm.so

WHat i want is that instead of depending on libjvm.so present in path /usr/java6//jre/bin/classic// , the exe utest should depend of libjvm.so present in any other path. I want to do this on the fly .... Can anyone suggest. Also, the ldd should show dependeny on new libjvm.so after modification.

Any suggestions?

2

Which "any other path" would you like it to depend on? It has to depend on something. Usually it's the path itself that's generic, a symbolic link that just points to the latest JRE.

What's your system?

3

Hello,
the path can be anything ..right?

let's say its /root/abc/def/mng/hjf/libjvm.so

I am on AIX 5.3 64 bit ....

---------- Post updated 02-17-12 at 06:53 AM ---------- Previous update was 02-16-12 at 09:28 PM ----------

There are couple of instances that there is no reply to my posts through this forum which i always look up as an expert forum. its strange that even problems which have simpler solutions dont get response within time. I had been observing this for the past 3-4 posts of mine. are the experts not looking frequently at the posts? or have the experts left this forum?

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btw the above problem gets resolved when you add "appropriate" path to the environment variable "LIBPATH" on AIX.
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4

define the environment variable LD_PRELOAD to point to a valid .so, probably in /etc/profile, or in some init script that is relevant to your problem.

export LD_PRELOAD=/path/to/another/libjvm.so

This will NOT work with setuid exectuable programs.

Okay - now please tell us what problem you are trying to fix, before you do this and break something else. We already know you believe this solves a problem.

5

actually using LIBPATH on aix solved my problem. how actually LD_PRELOAD maked the difference? is this supported on all platforms?