Cython errors when building p_group_cohomology

[Marc Culler]

I am not able to build the optional package p_group_cohomology in 10.2.rc2 due to cython errors.

The first error looks like:

[p_group_cohomology-3.3.3.p1]   Error compiling Cython file:
[p_group_cohomology-3.3.3.p1]   -------------------------------------------
-----------------
[p_group_cohomology-3.3.3.p1]   ...
[p_group_cohomology-3.3.3.p1]   from sage.structure.element cimport Element
[p_group_cohomology-3.3.3.p1]   from .map cimport Map
[p_group_cohomology-3.3.3.p1]   ^
[p_group_cohomology-3.3.3.p1]   -------------------------------------------
-----------------
[p_group_cohomology-3.3.3.p1]
[p_group_cohomology-3.3.3.p1]   /XXX/local/var/lib/sage/venv-python3.11.1/lib/python3.11/site-packages/sage/categories/morphism.pxd:2:0: 'sage/categories/map.pxd' not found

In fact, the file map.pxd does exist in the same directory as morphism.pxd, which is the file containing the failing cimport line.  But the missing path reported by cython is not an absolute path: sage/categories/map.pxd.  I don't know to which base directory that relative path is meant to be applied, but evidently it is wrong.

I will attach the log file.

- Marc

[Matthias Koeppe]

This will need an adjustment for namespace packages, see

https://groups.google.com/g/sage-devel/c/efuM_ruoOEk/m/UZ1QTohVEQAJ

[Dima Pasechnik]

This package produces mathematically incorrect results, as was shown on a trac ticket a couple of years ago, and no movement then. Demote to experimental?

[Michael Orlitzky]

On 2023-11-16 00:51:12, Dima Pasechnik wrote:
> This package produces mathematically incorrect results, as was shown
> on a trac ticket a couple of years ago, and no movement then. Demote
> to experimental?

There's not much distinction at this point, but if we're going by the
"builds on supported platforms" criteria, then it makes sense.

What would make even more sense is to give it a meson.build file (to
locate singular and gap), stick it on pypi, and then delete it from
the sage repo because at that point it could be installed with pip.

[Edgar Costa]

Marc, you should try something like this: https://github.com/edgarcosta/pyfib/commit/f30cd702f5b8610a284b1b1f425ef22b2a2a11fa

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[Marc Culler]

Thank you, Edgar!  That worked.

- Marc