[python] set rpath in setup.cfg

[Thomas Schwinge]

Hi!

On Wed, 12 Oct 2011 23:34:28 -0700, Jameson Graef Rollins <jrollins at finestructure.net> wrote:
> On Thu, 13 Oct 2011 08:12:03 +0200, dtk <dtk at gmx.de> wrote:
> > in my experience, it tends to cause awkward side effects that are hard to
> > debug, the main problem being that it overrides all default paths and is
> > hard to target at a single problematic application.
> 
> I think it's fairly straightforward to prepend a library path to the ld
> library path without overriding all defaults with something like this
> (for bash):
> 
> LD_LIBRARY_PATH=/new/ld/path:$LD_LIBRARY_PATH

This is in fact not safe, and may cause subtle issues: if LD_LIBRARY_PATH
is empty initally, it'll evaluate to:

    LD_LIBRARY_PATH=/new/ld/path:

Of this one, the last element is empty, and ld.so will thus look into the
current directory for libc.so, for example.  Now you cd /tmp/ and enter
ls...  :-)

Or, as it once bit me, you're on a system with such an LD_LIBRARY_PATH
set (without me knowing about it).  You do glibc development, and wonder
why some commands begin acting strangely when you're in the glibc build
directory...

Thus:

    LD_LIBRARY_PATH=/new/ld/path${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}


Grüße,
 Thomas
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