bundle libzmq as an Extension if it isn't found

[minrk]

The code to do this is largely from pyzmq-static, but with some important differences:

• libzmq as an extension is optional
• libzmq/uuid sources are downloaded as-needed
• platform.hpp is attempted by ./configure before falling back on
  shipped versions (also from pyzmq-static)

This should make pyzmq pip-installable without libzmq present, and remove the need for the pyzmq-static project to exist separately from pyzmq itself.

closes #128

[minrk]

The buildutils.py script is split into modules in buildutils, and largely unchanged. New code is almost entirely in the configure command object, and buildutils/bundle.py

[minrk]

If anyone wants to test this out, you can run:

pip install --upgrade https://github.com/minrk/pyzmq/tarball/bundle

Which should build on just about any system (only requirement is Cython, since it's from git rather than an sdist). I also made an sdist, which I will leave up for a bit of testing, so you can try:

pip install --upgrade http://ptsg.berkeley.edu/~minrk/pyzmq-2.2dev.tar.gz

while that file exists, which should genuinely have zero build dependencies, and fallback on bundling libzmq as an Extension if libzmq is unavailable.

[ellisonbg]

Does this cover the Windows case as well? If so, what are the build requirements on that platform?

[minrk]

Yes, it should work on Windows. The minimum build requirements on any platform should be: the ability to build Python C extensions.

[minrk]

I've done a few tests, and have successfully run pip install http://ptsg.berkeley.edu/~minrk/pyzmq-2.2dev.tar.gz on the following systems, without libzmq available, and confirmed that all cases result in a usable pyzmq:

• Windows 7 (x64):
  • py27-win32
  • py27-amd64
  • py32-win32
  • py32-amd64
• OS X 10.7:
  • System Python 2.6.7 (32+64b fat intel)
  • System Python 2.7.1 (32+64b fat intel)
  • Python.org 3.2.3 (32+64b fat intel)
• Ubuntu 12.04 (amd64):
  • Python 2.7.3
  • Python 3.2.3

The only disadvantage I can see relative to pyzmq-static is that the fallback position requires a network connection. But if you are already using pip, this seems a safe assumption.

[ellisonbg]

Great work! This is fantastic coverage and should really help make pyzmq even easier to install.

[minrk]

confirmed on freebsd9-i386 (py27) as well

[gtaylor]

This looks excellent. Hoping to see it land in master soon!