[pypy-dev] distutils configuration

Maciej Fijalkowski fijall at gmail.com
Wed Oct 4 10:45:43 EDT 2017


Hi David

As far as I remember, there are two implementations of sysconfig,
because CPython one parser Makefile or something like that which we
don't even really have, or more precisely didn't really have at the
time.

Overwriting CC and LDFLAGS can be definitely consider a bug, I would
accept the patch that changes it to accept it only conditionally.

PS. If you're using PyPy to compile C extensions using distutils (as
opposed to say cffi), while it's generally supported, the resulting
extensions are quite slow.

Best regards,
Maciej Fijalkowski

On Wed, Oct 4, 2017 at 2:52 PM, David Callahan <dcallahan at fb.com> wrote:
> I need to adjust the default configuration used by “distutils” for
> compilation.
>
>
>
> In my default build of branch release-pypy3.5-5.x, the toplevel
> “distutils.sysconfig” dispatches as follows:
>
>
>
> if '__pypy__' in sys.builtin_module_names:
>
>     from distutils.sysconfig_pypy import *
>
>     from distutils.sysconfig_pypy import _config_vars # needed by setuptools
>
>
>
> and sysconfig_pypy.py unconditionally sets some configuration variables such
> as “CC” and “LDSHARED”.
>
>
>
> CPython reads from a configuration file which can be change with an
> environment variable and it is this technique we use.  This does not yet
> seem supported in PyPy’s alternate implementation
> “distutils.sysconfig_cpython.py”
>
>
>
> Two questions:
>
> Generally, why are there are two implementations of sysconfig and what
> motivates the default choice?
>
> What changes are recommended to allow a configuration file here?
>
>
>
> Thanks
>
> david
>
>
>
>
>
>
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