Avoid segfault due to a bug in g++ 4.4.7 when the -Os setting for the module...

Avoid segfault due to a bug in g++ 4.4.7 when the -Os setting for the module init function is enabled.
Closes #2235.

CHANGES.rst

@@ -16,6 +16,9 @@ Bugs fixed
 * ``UnicodeEncodeError`` in Py2 when ``%s`` formatting is optimised for
   unicode strings.  (Github issue #2276)
 
+* Work around a crash bug in g++ 4.4.x by disabling the size reduction setting
+  of the module init function in this version.  (Github issue #2235)
+
 
 0.28.2 (2018-04-13)
 ===================

Cython/Utility/ModuleSetupCode.c

@@ -669,7 +669,8 @@ static CYTHON_INLINE void * PyThread_tss_get(Py_tss_t *key) {
 #ifndef CYTHON_SMALL_CODE
 #if defined(__clang__)
     #define CYTHON_SMALL_CODE
-#elif defined(__GNUC__)
+#elif defined(__GNUC__) && (!(defined(__cplusplus)) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 4)))
+    // At least g++ 4.4.7 can generate crashing code with this option. (GH #2235)
     #define CYTHON_SMALL_CODE __attribute__((optimize("Os")))
 #else
     #define CYTHON_SMALL_CODE