[Numpy-discussion] Current status of 64 bit windows support.

[Peter]

On Fri, Jul 1, 2011 at 7:23 PM, Sturla Molden <sturla at molden.no> wrote:
>
> Den 01.07.2011 19:22, skrev Charles R Harris:
>> Just curious as to what folks know about the current status of the
>> free windows 64 bit compilers. I know things were dicey with gcc and
>> gfortran some two years ago, but... well, two years have passed. This
>
> Windows 7 SDK is free (as in beer). It is the C compiler used to build
> Python on Windows 64. Here is the download:
>
> http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=3138
>
> A newer version of the Windows SDK will use a C compiler that links with
> a different CRT than Python uses. Use version 3.5. When using this
> compiler, remember to set the environment variable DISTUTILS_USE_SDK.
>
> This should be sufficient to build NumPy. AFAIK only SciPy requires a
> Fortran compiler.
>
> Mingw is still not stabile on Windows 64. There are supposedly
> compatibility issues between the MinGW runtime used by libgfortran and
> Python's CRT.  While there are experimental MinGW builds for Windows 64
> (e.g. TDM-GCC), we will probably need to build libgfortran against
> another C runtime for SciPy. A commercial Fortran compiler compatible
> with MSVC is recommended for SciPy, e.g. Intel, Absoft or Portland.
>
>
> Sturla

So it sounds like we're getting closer to having official NumPy 1.6.x
binaries for 64 bit Windows (using the Windows 7 SDK), but not quite
there yet? What is the roadblock? I would guess from the comments
on Christoph Gohlke's page the issue is having something that will
work with SciPy... see http://www.lfd.uci.edu/~gohlke/pythonlibs/

I'm interested from the point of view of third party libraries using
NumPy, where we have had users asking for 64bit installers. We
need an official NumPy installer to build against.

Regards,

Peter