FreeTDS Development Group

["Lowden, James K" <james.k.lowden AT alliancebernstein.com>]

> From: Carlos García
> Sent: Tuesday, November 07, 2006 3:50 PM
> 
> Can you help? These are the results for both commands you suggested.
> (rdd and readlf). /libsybdb /path is there.
> 
> [root@qonos php-5.1.6]# *ldd* /wwwroot/modules/libphp5.so
...
>    *  libsybdb.so.5 => /usr/local/freetds/lib/libsybdb.so.5 (0xf6ae1000)*
...
> [root@qonos php-5.1.6]# *readelf *-d /wwwroot/modules/libphp5.so
> | grep -i rpath
>  0x0000000f (RPATH)                      Library rpath:
> [/usr/local/freetds/lib]

Sorry, I can't help.  I don't know what's wrong.  

The ldd & readelf output tells you:

1.  ldd: the runtime linker finds libsybdb.  
2.  because (says readelf) the RPATH tells it to look in the right place.

That's good; it means you don't have to correct PHP's RPATH or otherwise help 
your linker find its libraries.  Unfortunately, though, it doesn't answer 
your question, and we're way beyond what I know about PHP.  

Someone else surely knows more.  

> Where is RPATH defined? 

The RPATH is added to the ELF binary (executable or shared library) by the 
linker.  Much like a PATH in your shell, it tells the binary where to look 
for shared objects.  When that library is an unusual place (like, say, 
/usr/local/freetds/lib), the RPATH becomes a very useful hint.  

http://netbsd.org/Documentation/elf.html
http://www-128.ibm.com/developerworks/linux/library/l-shlibs.html (by the 
ever-helpful Peter Seebach)

and, for the real deal, cf. page 46:

http://flint.cs.yale.edu/cs422/doc/ELF_Format.pdf

HTH.  

--jkl

P.S. (If I could make a small suggestion, though, please don't use asterisks 
and slashes for emphasis in your email when you're showing input and output.  
For me, at least, it's harder to read and a little bit misleading.)


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