[zeromq-dev] pyzmq: using libzmq functions from cython

[MinRK]

On Fri, Aug 9, 2013 at 12:00 PM, Michael Haberler <mail17 at mah.priv.at>wrote:

> Tom,
>
> Am 09.08.2013 um 20:34 schrieb Tom Farnbauer <tom.farnbauer at gmail.com>:
>
> > I'm pretty certain that I'm importing zmq first and it loads just fine.
> Then once I try to import my stuff, it fails and tells me that:
> >
> > ImportError: libzmq.so: cannot open shared object file: No such file or
> directory
> >
> > One interesting thing I noticed is that when I run `ldd <any one of
> pyzmq backend extensions>` libzmq.so is not in the output. It is however
> listed when I run it on my own extension module. This happens even if I
> link specifically against the libzmq instance that is bundled with zmq.
> I've tried playing around with different dlopen settings to no avail (based
> on this old info here:
> http://muttley.hates-software.com/2006/01/25/c37456e6.html). It appears
> that python doesn't use RTLD_GLOBAL by default, but trying to force it
> (through sys.setdlopenflags) didn't help...
> >
> > If I add the zmq package directory to LD_LIBRARY_PATH, it works just
> fine. I'm trying not to have to gdb it but I just may have to.
>
> you might want to look into the rpath linker option - in essence it gives
> you a way to bundle a library path with a binary
>

Ah yes, I forgot that I do this in pyzmq when I ship libzmq with it.  The
distutils setting is `runtime_library_dirs`, and can include relative paths
(relative to the compiled extension, if I recall).

-MinRK


>
> - Michael
>
>
> >
> > The code in question is here:
> https://github.com/SleepingPills/splice.io/blob/master/splice/receiver.pyx(warning: it is fairly hacky at the moment)
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