short-circuit setup_requires for egg_info in pip context

aholmberg · aholmberg · commit d8fff4628631 · 2015-12-02T15:56:14.000-06:00
PYTHON-448
diff --git a/setup.py b/setup.py
@@ -189,6 +189,7 @@ def __init__(self, ext):
 try_murmur3 = try_extensions and "--no-murmur3" not in sys.argv
 try_libev = try_extensions and "--no-libev" not in sys.argv and not is_pypy and not is_windows
 try_cython = try_extensions and "--no-cython" not in sys.argv and not is_pypy and not os.environ.get('CASS_DRIVER_NO_CYTHON')
+try_cython &= 'egg_info' not in sys.argv  # bypass setup_requires for pip egg_info calls, which will never have --install-option"--no-cython" coming fomr pip
 
 sys.argv = [a for a in sys.argv if a not in ("--no-murmur3", "--no-libev", "--no-cython", "--no-extensions")]
 
