[Python-Dev] Moving Python 3.5 on Windows to a new compiler

M.-A. Lemburg mal at egenix.com
Fri Jun 6 20:52:49 CEST 2014

On 06.06.2014 20:49, Brian Curtin wrote:
> On Fri, Jun 6, 2014 at 10:41 PM, M.-A. Lemburg <mal at egenix.com> wrote:
>> On 06.06.2014 20:25, Brian Curtin wrote:
>>> On Fri, Jun 6, 2014 at 10:19 PM, Chris Angelico <rosuav at gmail.com> wrote:
>>>> On Sat, Jun 7, 2014 at 4:12 AM, Steve Dower <Steve.Dower at microsoft.com> wrote:
>>>>> Chris Angelico wrote:
>>>>>> On Sat, Jun 7, 2014 at 1:41 AM, Steve Dower <Steve.Dower at microsoft.com> wrote:
>>>>>>> What this means for Python is that C extensions for Python 3.5 and later can be built using any version of MSVC from 14.0 and later.
>>>>>> Oh, if only this had been available for 2.7!! Actually... this means that 14.0 would be a good target for a compiler change for 2.7.x, if such a change is ever acceptable.
>>>>> Maybe, but I doubt it will ever be acceptable :)
>>>> Well, there were discussions. Since Python 2.7's support is far
>>>> exceeding the Microsoft promise of support for the compiler it was
>>>> built on, there's going to be a problem, one way or the other. I don't
>>>> know how that's going to end up being resolved.
>>> We're going to have to change it at some point, otherwise we're going
>>> to have people in 2018 scrambling to find VS2008, which will be 35
>>> versions too old by then. No matter what we do here, we're going to
>>> have a tough PR situation, but we have to make something workable. I'd
>>> rather cause a hassle than outright kill extensions.
>>> I would probably prefer we aim for VS 14 for 3.5, and then explore
>>> making the same change for the 2.7.x release that comes after 3.5.0
>>> comes out. Lessons learned and all that.
>> Are you sure that's an option ? Changing the compiler the stock
>> Python from python.org is built with will most likely render
>> existing Python extensions built for 2.7.x with x < (release that comes
>> after 3.5.0) broken, so users and installation tools will end up
>> having to pay close attention to the patch level version of Python
>> they are using... which is something we wanted to avoid after
>> we ran into this situation with 1.5.1 and 1.5.2 a few years ago.
> None of the options are particularly good, but yes, I think that's an
> option we have to consider. We're supporting 2.7.x for 6 more years on
> a compiler that is already 6 years old. Something less than awesome
> for everyone involved is going to have to happen to make that
> possible.

Perhaps we could combine this with the breakage that a Python 2.7.10
would introduce due to the two digit patch level release version ;-)

Marc-Andre Lemburg

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