#20382: Replace is_package_installed with Features
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Reporter: saraedum | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.2
Component: build | Resolution:
Keywords: | Merged in:
Authors: Julian Rüth | Reviewers: Nicolas M. Thiéry,
Report Upstream: N/A | ...
Branch: | Work issues: reorder classes in
u/saraedum/replace_is_package_installed_with_features| sage.misc.feature
Dependencies: | Commit:
| 2007e1822e0684078323677211c3a893d5af414e
| Stopgaps:
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Comment (by saraedum):
I already thought about moving parts of this out of the source tree. I
have not really reached a conclusion yet. It certainly needs to be used
during build time. Currently, we have `sage_setup/optional_extension.py`
which calls `sage.misc.package.is_package_installed`. So, at least in a
first version, I would certainly mimic this behaviour and check for a
feature (in this case, whether Cython can build against a library) at
build time.
Replying to [comment:28 vdelecroix]:
> This code is mostly Sage agnostic right?
The idea is Sage agnostic. The features it checks for are of course
relatively Sage specific.
> Would it be possible to move this code out of Sage source code? It would
better be in `sage/src/sage_setup/` or whatever appropriate (even possibly
an external python module). We might want to use it outside of Sage or
before Sage is built to track possible dependencies.
I am not sure about moving it to `sage_setup`. We need this at runtime.
Can we (and should we?) access things in `sage_setup` at runtime?
It is an interesting idea to make it a separate package. There seems to be
no python package around which does anything similar. I would be happy to
pursue such a path but would like to postpone this to a followup ticket.
--
Ticket URL: <http://trac.sagemath.org/ticket/20382#comment:30>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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