On 08/09/2017 08:55, Simon King wrote:
On 2017-09-08, Simon King <[email protected]> wrote:When I do libgap_enter() and then cdef GapElement_FiniteField zero = libgap(F.zero()) (where F=GF(2)), I get a crash. I am about to test whether I can make up a minimal example from it.Voilà : sage: cython(""" ....: #!clib gap ....: from sage.libs.gap.gap_includes cimport * ....: from sage.libs.gap.element cimport GapElement_FiniteField ....: from sage.libs.gap.libgap import libgap ....: def test(x): ....: libgap_enter() ....: cdef GapElement_FiniteField y = libgap(x) ....: libgap_exit() ....: """) sage: test(GF(2).zero()) The above crashes. When I move libgap_enter() one line down, it works. Reason?
In the above code you are *not* calling the C API. Just avoid the libgap_enter / libgap_exit.
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