Complex Integration of Fortran function in Arb Library using Fortran-C Interoperability

[Akhil Akkapelli]

I'm trying to use the acb_calc_integrate function from the Arb C library to calculate the integral of a Fortran function through Fortran-C interoperability.

However, I'm encountering a segmentation fault when integrating a Fortran program with the polynomial function f(z) = 1 + z + z^2 + z^3 as the integrand. This issue doesn't occur when the polynomial function is f(z) = 1 + z + z^2, and the same Fortran program works fine. This issue is not present when integrating in equivalent C program.

I'm looking for assistance to understand why this segmentation fault is happening in Fortran and how to fix it. I have detailed the issue in an issue report on the Flint GitHub repository here:https://github.com/flintlib/flint/issues/2036.

Any help would be appreciated.

[Albin Ahlbäck]

Have you tried with a newer version of FLINT? Is the problem the same,
still? It either looks like a linker issue or calling convention issue
(ABI issue).

Best,
Albin

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[Rudi Gaelzer]

You could try posing your question to the Fortran Discourse Forum  (https://fortran-lang.discourse.group).