[Numpy-discussion] 64bit infrastructure

David Cournapeau cournape@gmail....
Wed Aug 22 09:28:38 CDT 2012


On Wed, Aug 22, 2012 at 3:25 PM, Travis Oliphant <travis@continuum.io> wrote:
>
> On Aug 22, 2012, at 3:59 AM, Ralf Gommers wrote:
>
>
>
> On Tue, Aug 21, 2012 at 12:51 AM, Travis Oliphant <travis@continuum.io>
> wrote:
>>
>> I'm actually not sure, why.   I think the issue is making sure that the
>> release manager can actually "build" NumPy without having to buy a
>> particular compiler.
>
>
> That would help, yes. MS Express doesn't work under Wine last time I checked
> by the way.
>
> However, the issue is more than just one license. There's a large number of
> packages that depend on numpy and provide binaries. If they can't make those
> compatible with numpy ones, that's a problem. Users will first install numpy
> 64-bit, and then later find out that part of the scientific Python stack
> isn't available to them anymore.
>
>
>
> As far as I understand, you don't *have* to build all downstream
> dependencies with the same compiler that NumPy was built with unless your
> extension relies on the way C-functions pass structures on the stack (not
> pointers to them, but structures as a whole) or if it relies on the
> representation of FILE*.      At one time all structures were passed as
> pointers specifically for this reason.   The FILE* situation is a problem,
> but most extensions don't use NumPy C-API calls that have a FILE* argument.

It is much more pervasive than that, unfortunately. And for fortran,
it is much worse, because if we build scipy or numpy with Intel
Fortran, I think we pretty much force everyone to use intel fortran
for *any* binary on top of them.

David


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