[Numpy-discussion] Should we drop support for "one file" compilation mode?

[David Cournapeau]

On Tue, Oct 6, 2015 at 5:58 PM, Nathaniel Smith <njs at pobox.com> wrote:

> On Tue, Oct 6, 2015 at 9:51 AM, David Cournapeau <cournape at gmail.com>
> wrote:
> >
> > On Tue, Oct 6, 2015 at 5:44 PM, Nathaniel Smith <njs at pobox.com> wrote:
> >>
> >> On Tue, Oct 6, 2015 at 4:46 AM, David Cournapeau <cournape at gmail.com>
> >> wrote:
> >> > The npy_ functions in npymath were designed to be exported. Those
> would
> >> > stay
> >> > that way.
> >>
> >> If we want to export these then I vote that we either:
> >> - use the usual API export mechanism, or else
> >> - provide a static library for people to link to, instead of trying to
> >> do runtime binding. (I.e. drop it in some known place, and then
> >> provide some functions for extension modules to find it at build time
> >> -- similar to how np.get_include() works.)
> >
> > Unless something changed, that's more or less how it works already
> (npymath
> > is used in scipy, for example, which was one of the rationale for
> writing it
> > in the first place !).
>
> Okay... in fact multiarray.so right now *does* export tons and tons of
> random junk into the global symbol namespace (on systems like Linux
> that do have a global symbol namespace), so it isn't obvious whether
> people are asking for that to continue :-). I'm just specifically
> saying that we should try to get this back down to the 1 exported
> symbol.
>
> (Try:
>    objdump -T $(python -c 'import numpy;
> print(numpy.core.multiarray.__file__)')
> This *should* print 1 line... I currently get ~700. numpy.core.umath
> is similar.)
>
>
I think this overestimates the amount by quite a bit, since you see GLIBC
symbols, etc... I am using nm -Dg --defined-only $(python -c 'import numpy;
print(numpy.core.multiarray.__file__)')    instead.

I see around 290 symboles: the npy_ from npymath don't bother me, but the
ones from npysort do. We should at least prefix those with npy_ (I don't
think npysort API has ever been publisher in our header like npymath was ?)

David

-n
>
> --
> Nathaniel J. Smith -- http://vorpus.org
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