use abi3 extension if Extension().is_abi3

1 files changed, 4 insertions, 0 deletions

diff --git a/setuptools/extension.py b/setuptools/extension.py
index 5ea72c06..a6cc0915 100644
--- a/setuptools/extension.py
+++ b/setuptools/extension.py
@@ -36,6 +36,10 @@ have_pyrex = _have_cython
 class Extension(_Extension):
     """Extension that uses '.c' files in place of '.pyx' files"""
 
+    def __init__(self, name, sources, is_abi3=False, **kw):
+        self.is_abi3 = is_abi3
+        _Extension.__init__(self, name, sources, **kw)
+
     def _convert_pyx_sources_to_lang(self):
         """
         Replace sources with .pyx extensions to sources with the target