Removed need for Binding entry_point

1 files changed, 18 insertions, 10 deletions

diff --git a/setup.py b/setup.py
index 30146b71..6a7642ff 100644
--- a/setup.py
+++ b/setup.py
@@ -14,6 +14,7 @@
 from __future__ import absolute_import, division, print_function
 
 import os
+import platform
 import subprocess
 import sys
 from distutils.command.build import build
@@ -57,6 +58,21 @@ if not os.path.exists(os.path.join(base_dir, "vectors/setup.py")):
     test_requirements.append(VECTORS_DEPENDENCY)
 
 
+def cc_is_available():
+    return sys.platform == "darwin" and list(map(
+        int, platform.mac_ver()[0].split("."))) >= [10, 8, 0]
+
+
+backends = [
+    "openssl = cryptography.hazmat.backends.openssl:backend"
+]
+
+if cc_is_available():
+    backends.append(
+        "commoncrypto = cryptography.hazmat.backends.commoncrypto:backend",
+    )
+
+
 def get_ext_modules():
     from cryptography.hazmat.bindings.commoncrypto.binding import (
         Binding as CommonCryptoBinding
@@ -71,7 +87,7 @@ def get_ext_modules():
         constant_time._ffi.verifier.get_extension(),
         padding._ffi.verifier.get_extension()
     ]
-    if CommonCryptoBinding.is_available():
+    if cc_is_available():
         ext_modules.append(CommonCryptoBinding().ffi.verifier.get_extension())
     return ext_modules
 
@@ -178,14 +194,6 @@ setup(
     },
 
     entry_points={
-        "cryptography.hazmat.backends": [
-            "commoncrypto = cryptography.hazmat.backends.commoncrypto:backend",
-            "openssl = cryptography.hazmat.backends.openssl:backend"
-        ],
-
-        "cryptography.hazmat.is_backend_available": [
-            "commoncrypto = cryptography.hazmat.bindings.commoncrypto."
-            "binding:Binding.is_available"
-        ]
+        "cryptography.backends": backends,
     }
 )