Hi Volker,
On 2016-08-07, Volker Braun <vbraun.n...@gmail.com> wrote:
> On Sunday, August 7, 2016 at 3:04:18 PM UTC+2, Simon King wrote:
>>
>> OK, then I'll open a ticket to let the meataxe package provide a shared
>> library. My to-be-newstylified cohomology package relies on C library
>> that is created with -lmtx.
>
>
> That would work, but its probably a better design to only have
> sage.libs.meataxe provide a Python/Cython wrapper and be the only one to
> link against libmtx; Your cohomology package would then only use it
> via sage.libs.meataxe.
My cohomology package relies on another C library - I am upstream and will
call it "modres", as it computes resolutions of modular group algebras
of p-groups.
Thus, the full story currently is:
- My cohomology code (Python/Cython) cimports from sage.libs.modres,
sage.libs.meataxe and sage.matrix.matrix_gfpn_dense.
I build all these extension modules with
libraries = ['mtx', 'modres']
in module_list.py. Is that a mistake, i.e., can I drop mtx from the
list?
- sage.matrix.matrix_gfpn_dense cimports from sage.libs.modres
- sage.libs.meataxe is a pxd file wrapping meataxe.h
- sage.libs.modres is a pxd file cimporting from sage.libs.meataxe and
wrapping the headers of libmodres.
- modres is a C library libmodres plus some executables, all linked against
libmtx
- meataxe is a static (by upstream's choice) C library libmtx plus some
executables linked with -lmtx. In the executables, the correct value
of MtxLibDir is determined by an environment variable. I am patching
meataxe anyway and wouldn't mind to add another patch.
>From your and Leif's hints, I see the following ways out:
1. Drop upstream's choice and build libmtx as a shared library.
2. Keep libmtx static, but add a function to meataxe that allows to
define MtxLibDir, and use that function separately in all modules
that are built with -lmtx.
Is there a third way? Is one of them clearly better?
Best regards,
Simon
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