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Re: LD_LIBRARY_PATH ; to set or not to set....



On Wed, 2006-05-17 at 10:16 -0400, James Pifer wrote:
> I'm wrote a small java app that I will run in a jsp. The vendor supplied
> jars also come with shared libraries that are required. Their
> documentation says to set LD_LIBRARY_PATH to the directory where you put
> the libraries. 
> 
> This works fine when running the app from a terminal environment after
> setting LD_LIBRARY_PATH. The problem is that when I run the jsp it's run
> from an application that runs as a service, so LD_LIBRARY_PATH is not
> set in that environment. 
> 
> In searching on this issue I found MANY people saying it's bad to set
> LD_LIBRARY_PATH.
These people are mislead. Setting LD_LIBRARY_PATH adds complexity and
can be error-prone to use, but that's basically all.

A similarily, semi-portable, alternative would be to apply -rpath (c.f.
info ld).

> I've tried running ldconfig -n and the directory but it hasn't seemed to
> work. 
> 
> So what is the proper way to do this?
LD_LIBRARY_PATH, -rpath both are proper ways.

A third and mostly glibc proprietary alternative would be to apply
ld.so.conf rsp. /etc/ld.so.conf.d/ (c.f. man ld.so). It's the way Linux
vendors (e.g. RH) prefer for their packages, but they are problematic
otherwise (e.g. when installing a shared library and not having root
privileges) 

>  I want to set these libraries and
> have them set after a system restart, etc.
For system-wide installation under Linux, ld.so.conf / ldconfig is the
probably is simplest approach.

Ralf



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