#11551: Pari segfault on Sage startup in Cygwin
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Reporter: kcrisman | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.2
Component: cygwin | Keywords: pari
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by leif):
I have no idea why `real_mpfr`[`.pyx`] shouldn't initialize [the] PARI
[library] (i.e., the `pari_instance` variable defined in
`sage/libs/pari/gen.pyx`), but you (Karl-Dieter) could verify it gets
initialized by putting some print statement(s) into `PariInstance`'s
`__init__()`, preferably (also) around `pari_init_opts()`, to make sure
the latter really gets called, because of
{{{
#!python
if bot:
return # pari already initialized.
}}}
There are a few things that might be relevant here:
* Cython doesn't support C `enum` constants (here e.g. `INIT_DFTm`),
therefore one has to declare them as `cdef extern int`s, but I don't think
that's the problem here.
* `bot` is a very bad name for a global variable (of a ''library''!),
i.e. some other library / module might use the same for a different
purpose, such that the one supposed to be PARI's may actually already have
some non-zero value despite PARI not yet being initialized. (The
early-`return` check in `PariInstance`'s `__init__()` worsens that to some
extent, though other problems would certainly arise later in that case.)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11551#comment:17>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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