Finding .so files without setting LD_LIBRARY_PATH

[Paul Smith]

On Thu, 2016-05-12 at 07:55 +0300, Jussi Piitulainen wrote:
> eryk sun writes:
> 
> > On Wed, May 11, 2016 at 10:39 PM, Paul Smith wrote:
> > > Hi all.  I have a locally-built version of Python (2.7.11) that I'm
> > > copying around to different systems, running all different versions of
> > > GNU/Linux.
> > ...
> > > What I'd like to do is have a way of setting the library path that
> > > Python uses when it tries to load .so files (for example in the ssl
> > > module which loads lib-dynload/_ssl.so which links to libssl.so and
> > > libcrypto.so), WITHOUT setting LD_LIBRARY_PATH in the environment that
> > > Python passes to its children.
> > 
> > An ELF header can contain either an RPATH or a RUNPATH to extend the
> > library search path at load time.

Yes, I'm familiar with rpath.  However I don't know how to set it for
Python .so's that appear in the lib-dynload directory, including site
-packages, which is where it needs to be ... I tried to go through the
Modules/Setup etc. but to no avail :(.

> There's a tool (GPLv3+) called patchelf that can set these in an ELF
> binary:

Aha!  That's excellent!  The only one I was aware of was chrpath which
doesn't allow you to add an rpath if one doesn't exist, or add an rpath
which is longer than the one that already exists.

This will make things much simpler.

Cheers!