commit 9cead06076f890d4951b3ea2571408efe76f8b2c
author Neil Schemenauer <nas-github@arctrix.com> Thu Jun 15 19:12:46 2017 -0700
committer Mariatta <Mariatta@users.noreply.github.com> Thu Jun 15 19:12:46 2017 -0700
tree 9f4a816fa83e49a46f35c8c7d968dc8f329f8db2
parent 6a90a124706b73824aebf5c2bd7b27daf82b2342

Check that Python is 64-bit before enabling BLAKE2_USE_SSE. (GH-1332) (GH-2042)

(cherry picked from commit 6c991bdee7ec4bedd8c1b8d3812dc884b654b57c)

setup.py

diff --git a/setup.py b/setup.py
index f04bf22..fe47797 100644
--- a/setup.py
+++ b/setup.py
@@ -897,8 +897,11 @@
         blake2_deps.append('hashlib.h')
 
         blake2_macros = []
-        if not cross_compiling and os.uname().machine == "x86_64":
-            # Every x86_64 machine has at least SSE2.
+        if (not cross_compiling and
+                os.uname().machine == "x86_64" and
+                sys.maxsize >  2**32):
+            # Every x86_64 machine has at least SSE2.  Check for sys.maxsize
+            # in case that kernel is 64-bit but userspace is 32-bit.
             blake2_macros.append(('BLAKE2_USE_SSE', '1'))
 
         exts.append( Extension('_blake2',