[Python-Dev] PEP 0404 and VS 2010 (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Thu Nov 21 05:09:38 CET 2013

On 21 Nov 2013 10:33, "Antoine Pitrou" <solipsis at pitrou.net> wrote:

On Wed, 20 Nov 2013 17:30:44 -0500 Barry Warsaw <barry at python.org> wrote: > On Nov 20, 2013, at 09:52 PM, Christian Tismer wrote: > > >Many customers are forced to stick with Python 2.X because of other products, > >but they require a Python 2.X version which can be compiled using Visual > >Studio 2010 or better. This is considered an improvement and not a bug fix, > >where I disagree. > > I'm not so sure about that. Python 2.7 can still get patches to help extend > its useful life by allowing it to be built with newer compiler suites. I > believe this has already been done for various Linux compilers. I see no > non-technical reason why Python 2.7 can't be taught how to build with VS 2010 > or newer. Details are subject to RM approval, IMHO. I think it isn't only about teaching it to build with VS 2010, but providing binaries compatible with the VS 2010 runtime. Otherwise, AFAIU, if extensions are built with VS 2010 but loader with a VS 2008-compiled Python, there will be ABI problems.

Right, this is the problem - building with newer compilers isn't an issue, changing the Windows ABI is (which is the reason Christian is proposing a version bump to denote the ABI incompatibility).

If Visual Studio Express 2010 and later can be told to build against the VS2008 C runtime, then that is something that can (and probably should) be enabled in the next CPython 2.7 maintenance release (for both the main build process and for distutils extension building).

Doing a 2.8 release just to change the Windows ABI to a new version of the MS C runtime, on the other hand, seems impossible to do without thoroughly confusing people (regardless of whether it's CPython or Stackless making such a change).

I'd certainly want to explore all our alternatives with the Microsoft folks for getting our preferred option (new compiler, old C runtime) working in an open source friendly way before we went down the path of a 2.x ABI bump.

I've cc'ed Steve Dower directly, as he's the best person I know to ask about this kind of problem.

Cheers, Nick.

Regards Antoine.

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