python-gevent: fix build with Cython 0.26

srcpkgs/python-gevent/patches/4c25c7de7bca39b753e177837fa1bdff0fb7ecf1.patch

@@ -0,0 +1,62 @@
+From 4c25c7de7bca39b753e177837fa1bdff0fb7ecf1 Mon Sep 17 00:00:00 2001
+From: Jason Madden <jamadden@gmail.com>
+Date: Thu, 20 Jul 2017 08:03:06 -0500
+Subject: [PATCH] Disable auto-pickling to work around
+ https://github.com/cython/cython/issues/1786. We don't want to allow that in
+ a point-release of gevent anyway.
+
+---
+ src/gevent/_semaphore.pxd      | 1 +
+ src/gevent/_semaphore.py       | 1 +
+ src/gevent/ares.pyx            | 5 +++++
+ src/gevent/libev/corecext.ppyx | 5 +++--
+ 4 files changed, 10 insertions(+), 2 deletions(-)
+
+diff --git src/gevent/_semaphore.pxd src/gevent/_semaphore.pxd
+index 6382d560..1d66da76 100644
+--- src/gevent/_semaphore.pxd
++++ src/gevent/_semaphore.pxd
+@@ -1,3 +1,4 @@
++# cython: auto_pickle=False
+ cdef class Semaphore:
+     cdef public int counter
+     cdef readonly object _links
+diff --git src/gevent/_semaphore.py src/gevent/_semaphore.py
+index c6e11622..28b7d085 100644
+--- src/gevent/_semaphore.py
++++ src/gevent/_semaphore.py
+@@ -1,3 +1,4 @@
++# cython: auto_pickle=False
+ import sys
+ from gevent.hub import get_hub, getcurrent
+ from gevent.timeout import Timeout
+diff --git src/gevent/ares.pyx src/gevent/ares.pyx
+index 92832cc2..ce675d80 100644
+--- src/gevent/ares.pyx
++++ src/gevent/ares.pyx
+@@ -1,4 +1,9 @@
+ # Copyright (c) 2011-2012 Denis Bilenko. See LICENSE for details.
++# Automatic pickling of cdef classes was added in 0.26. Unfortunately it
++# seems to be buggy (at least for the `result` class) and produces code that
++# can't compile ("local variable 'result' referenced before assignment").
++# See https://github.com/cython/cython/issues/1786
++# cython: auto_pickle=False
+ cimport cares
+ import sys
+ from python cimport *
+diff --git src/gevent/libev/corecext.ppyx src/gevent/libev/corecext.ppyx
+index a474d7e2..f7a6caae 100644
+--- src/gevent/libev/corecext.ppyx
++++ src/gevent/libev/corecext.ppyx
+@@ -1,8 +1,9 @@
+ # Copyright (c) 2009-2012 Denis Bilenko. See LICENSE for details.
+ # This directive, supported in Cython 0.24+, causes sources files to be
+ # much smaller and thus cythonpp.py to be slightly faster. But it does make
+-# debugging more difficult.
+-# cython: emit_code_comments=False
++# debugging more difficult. Auto-pickling was added in 0.26, and that's a new feature
++# that we don't need or want to allow in a gevent point release.
++# cython: emit_code_comments=False, auto_pickle=False
+ cimport cython
+ cimport libev
+ # Note this is not the standard cython 'cpython' (which has a backwards compat alias of 'python')