cffi leaves __pycache__ around in the *source* directory, so when we build

64-bit after 32-bit (or vice versa), the modules already exist, but are of the

wrong ELF class. Ideally, the entire build would happen outside the source

directory, but for the time being, this patch at least makes sure distutils'

build_base directory (plus an extraneous directory structure) is used for the

object files and shared objects.

There's probably a better way, but it will likely involve deep distutils magic

and maybe some patches to cffi.

--- xattr-0.7.4/setup.py Mon Mar 3 10:13:29 2014

+++ xattr-0.7.4/setup.py Mon Apr 14 14:09:58 2014

@@ -12,6 +12,8 @@

setup_requires hasn't run yet.

"""

def finalize_options(self):

+ import cffi.verifier

+ cffi.verifier.set_tmpdir(self.build_base)

from xattr.lib import ffi

self.distribution.ext_modules = [ffi.verifier.get_extension()]

build.finalize_options(self)