Merge pull request #9120 from soltanmm-google/if-you-run-away-from-things-it-just-means-you're-going-to-see-them-again-when-you-wrap-around-the-universe

Fix Python setup-time diagnostics

setup.py

@@ -218,6 +218,9 @@ SETUP_REQUIRES = INSTALL_REQUIRES + (
     'six>=1.10',
   ) if ENABLE_DOCUMENTATION_BUILD else ()
 
+try:
+  import Cython
+except ImportError:
   if BUILD_WITH_CYTHON:
     sys.stderr.write(
       "You requested a Cython build via GRPC_PYTHON_BUILD_WITH_CYTHON, "

src/python/grpcio/support.py

@@ -100,9 +100,15 @@ def diagnose_compile_error(build_ext, error):
             .format(source)
           )
 
+def diagnose_attribute_error(build_ext, error):
+  if any('_needs_stub' in arg for arg in error.args):
+    raise commands.CommandError(
+        "We expect a missing `_needs_stub` attribute from older versions of "
+        "setuptools. Consider upgrading setuptools.")
 
 _ERROR_DIAGNOSES = {
-    errors.CompileError: diagnose_compile_error
+    errors.CompileError: diagnose_compile_error,
+    AttributeError: diagnose_attribute_error
 }
 
 def diagnose_build_ext_error(build_ext, error, formatted):