From c8da4c3399dd564c24a42171e7043d43e0b01659 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Mon, 10 Mar 2014 08:22:09 -0400
Subject: self.language could be None (and is None by default)

---
 setuptools/extension.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'setuptools/extension.py')

diff --git a/setuptools/extension.py b/setuptools/extension.py
index 06ec1cec..d8516092 100644
--- a/setuptools/extension.py
+++ b/setuptools/extension.py
@@ -38,7 +38,8 @@ class Extension(_Extension):
             # the build has Cython, so allow it to compile the .pyx files
             return
         def pyx_to_target(source):
-            target_ext = '.cpp' if self.language.lower() == 'c++' else '.c'
+            lang = self.language or ''
+            target_ext = '.cpp' if lang.lower() == 'c++' else '.c'
             if source.endswith('.pyx'):
                 source = source[:-4] + target_ext
             return source
-- 
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