On Tue, Jul 21, 2015 at 9:38 AM, Oscar Benjamin <oscar.j.benja...@gmail.com> wrote:
> > I think it would be great to just package these up as wheels and put them > on PyPI. > that's the point -- there is no way with the current spec to specify a wheel dependency as opposed to a package dependency. i.e this particular binary numpy wheel depends on this other wheel, whereas the numpy source pacakge does not have that dependency -- and, indeed, a wheel for one platform may have different dependencies that\n other platforms. > So numpy could depend on "blas" and there could be a few different > distributions on PyPI that provide "blas" representing the different > underlying libraries. If I want to install numpy with a particular one I > can just do: > > pip install gotoblas # Installs the BLAS library within Python dirs > pip install numpy > well,different implementations of BLAS are theoretically ABI compatible, but as I understand it, it's not actually that simple, so this is particularly challenging. But if it were, this would be a particular trick, because then that numpy wheel would depend on _some_ BLAS wheel, but there may be more than one option -- how would you express that???? -Chris > You could have a BLAS distribution that is just a shim for a system BLAS > that was installed some other way. > > pip install --install-option='--blaslib=/usr/lib/libblas' systemblas > pip install numpy > > That would give linux distros a way to provide the BLAS library that > python/pip understands without everything being statically linked and > without pip needing to understand the distro package manager. Also python > packages that want BLAS can use the Python import system to locate the BLAS > library making it particularly simple for them and allowing distros to move > things around as desired. > > I would like it if this were possible even without wheels. I'd be happy > just that the commands to download a BLAS library, compile it, install it > non-globally, and configure numpy to use it would be that simple. If it > worked with wheels then that'd be a massive win. > > -- > Oscar > -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov
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