Import Cython.Compiler.Main as recommended by Cython project to impro…

…ve Cython detection. Fixes #1229.
pypa · Feb 4, 2018 · ca71bc2 · ca71bc2
1 parent 5f576fd
commit ca71bc2
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diff --git a/CHANGES.rst b/CHANGES.rst
@@ -1,3 +1,9 @@
+v38.5.0
+-------
+
+* #1229: Expand imports in ``build_ext`` to refine detection of
+  Cython availability.
+
 v38.4.1
 -------
 

diff --git a/setuptools/command/build_ext.py b/setuptools/command/build_ext.py
@@ -15,6 +15,9 @@
 try:
     # Attempt to use Cython for building extensions, if available
     from Cython.Distutils.build_ext import build_ext as _build_ext
+    # Additionally, assert that the compiler module will load
+    # also. Ref #1229.
+    __import__('Cython.Compiler.Main')
 except ImportError:
     _build_ext = _du_build_ext