Update to greenlet 0.4.14. Fixes #1260.

CHANGES.rst

@@ -7,7 +7,10 @@
 1.3.6 (unreleased)
 ==================
 
-- Nothing changed yet.
+- gevent now depends on greenlet 0.4.14 or above. gevent binary wheels
+  for 1.3.5 and below must have greenlet 0.4.13 installed on Python
+  3.7 or they will crash. Reported by Alexey Stepanov in :issue:`1260`
+  and pkittenis in :issue:`1261`.
 
 
 1.3.5 (2018-07-16)

ci-requirements.txt

@@ -7,8 +7,8 @@ wheel
 # at the same time.
 Cython >= 0.28.1
 
-# Python 3.7b1 requires this.
-greenlet>=0.4.13 ; platform_python_implementation == "CPython"
+# Python 3.7 requires at least 0.4.14, which is ABI incompatible with earlier
+greenlet>=0.4.14 ; platform_python_implementation == "CPython"
 pylint>=1.8.0 ; python_version < "3.4"
 pylint >= 2.0.0.dev2 ; python_version >= "3.4"
 # pylint 2 needs astroid 2; unfortunately, it uses `typed_ast`

deps/greenlet/greenlet.h

@@ -11,7 +11,11 @@
 extern "C" {
 #endif
 
-#define GREENLET_VERSION "0.4.13"
+#define GREENLET_VERSION "0.4.14"
+
+#if PY_VERSION_HEX >= 0x030700A3
+#  define GREENLET_USE_EXC_INFO
+#endif
 
 typedef struct _greenlet {
 	PyObject_HEAD
@@ -25,9 +29,14 @@ typedef struct _greenlet {
 	struct _frame* top_frame;
 	int recursion_depth;
 	PyObject* weakreflist;
+#ifdef GREENLET_USE_EXC_INFO
+	_PyErr_StackItem* exc_info;
+	_PyErr_StackItem exc_state;
+#else
 	PyObject* exc_type;
 	PyObject* exc_value;
 	PyObject* exc_traceback;
+#endif
 	PyObject* dict;
 } PyGreenlet;
 

setup.py

@@ -193,7 +193,8 @@
     # We need to watch our greenlet version fairly carefully,
     # since we compile cython code that extends the greenlet object.
     # Binary compatibility would break if the greenlet struct changes.
-    'greenlet >= 0.4.13; platform_python_implementation=="CPython"',
+    # (Which it did in 0.4.14 for Python 3.7)
+    'greenlet >= 0.4.14; platform_python_implementation=="CPython"',
 ]
 
 # Note that we don't add cffi to install_requires, it's