extra_compile_args in Cython

I want to pass some extra options to the Cython compiler by using extra_compile_args.

My setup.py:

from distutils.core import setup

from Cython.Build import cythonize

setup(
  name = 'Test app',
  ext_modules = cythonize("test.pyx", language="c++", extra_compile_args=["-O3"]),
)

However, when I run python setup.py build_ext --inplace, I get the following warning:

UserWarning: got unknown compilation option, please remove: extra_compile_args

Question: How does one use extra_compile_args correctly?

I use Cython 0.23.4 under Ubuntu 14.04.3.

Use the more traditional way without cythonize to supply extra compiler options:

from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext

setup(
  name = 'Test app',
  ext_modules=[
    Extension('test',
              sources=['test.pyx'],
              extra_compile_args=['-O3'],
              language='c++')
    ],
  cmdclass = {'build_ext': build_ext}
)