Re: How to set LD_LIBRARY_PATH

On May 29, 2010, at 6:24 AM, Paul Johnson wrote:

> On Fri, May 28, 2010 at 11:23:32AM -0700, Marilyn Sander wrote:
>
>> On May 28, 2010, at 9:33 AM, Paul Johnson wrote:
>>
>>> On Fri, May 28, 2010 at 06:14:38AM -0400, John Scoles wrote:
>>>
>>>> You will have to set those values before your modules load.
>>>>
>>>> So you should stick them in the BEGIN and that should work
>>>
>>> ... except where it doesn't, such as on Solaris for example.  Here,
>>> LD_LIBRARY_PATH (at least) really does need to be set before the  
>>> process
>>> starts.  You can do this by writing a shell wrapper, or re-execing  
>>> your
>>> perl script if the value is not already set.
>
>> Have you considered doing a require instead of a use.  With  
>> require, the
>> loading is done at run time, and would be governed by the setting of
>> LD_LIBRARY_PATH, at the time the require statement is executed.   
>> Just set
>> LD_LIBRARY_PATH before doing the require.
>
> I'm afraid that you may have misunderstood what I wrote.  There are
> times when you really do need to set the variable before the process
> starts.
>
I did not misunderstand what you wrote.  My reasoning was that the  
thing being
loaded is a shared object (.so file).  The system loader (ld) has to  
be invoked for loading
a shared object.  That seems to me to require a separate process, with  
an environment
stack inherited from the Perl process that invokes it.  I was also  
assuming that setting
an environment variable at run time would set the environment for the  
Perl process
that is executing the Perl program.  However, I did not test it.  I  
will test it and see what happens.
--Marilyn