Automatically disable C extensions on PyPy

[thedrow]

Using a CPython extension on PyPy will slow this module down.

[tobgu]

Yes, for sure. Do you have an example where the C extension is built when installing pyrsistent under PyPy? It's meant not to.

[thedrow]

What you need to do is just modify https://github.com/tobgu/pyrsistent/blob/master/setup.py#L46 to check if running on PyPy like this.

[tobgu]

Do you mean that https://github.com/tobgu/pyrsistent/blob/master/setup.py#L17 is not working for you?

[thedrow]

Oh I did not notice that.