Re: Fast versions of scipy.io.mmread/write

On Fri, Apr 14, 2023 at 5:56 PM Stefan van der Walt <[email protected]>
wrote:

> Hi Ralf,
>
> On Fri, Apr 14, 2023, at 08:57, Ralf Gommers wrote:
>
> - you have to (unfortunately) also still deal with the setup.py-based
> build in one way or the other. We're going to throw it out soon, so you can
> either ignore it and keep the slow `_mmio.py` implementation for that, or
> integrate the C++ code in `scipy/io/setup.py`. The latter is a little
> nicer, but in case it's tricky to get to work then keeping the slow code is
> also okay. The only reason we will still keep it around for the 1.11.0
> release (probably) is conda-forge on Windows, so that's a limited number of
> users who'd get the slow code.
>
>
> I'd be curious to learn more about the build issues on conda-forge; is
> there a related issue? skimage just did a cross-compiled conda-forge
> release using the new meson machinery, but of course it's a significantly
> simpler setup than SciPy.
>

Oh that's the usual "there is no suitable Fortran compiler on Windows". See
https://github.com/conda-forge/scipy-feedstock/issues/213 for details. We
have a custom Mingw-w64 based toolchain for our own wheels, but that
doesn't translate too well to any other packaging ecosystem where the
compiler itself is distributed as a package and things have to be built in
as uniform a way as possible.

Cheers,
Ralf

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