[petsc-dev] GCC8 Fortran length changes from int to size_t

Lisandro Dalcin dalcinl at gmail.com
Mon May 7 03:56:44 CDT 2018

On Mon, 7 May 2018 at 03:11, Jed Brown <jed at jedbrown.org> wrote:

> Lisandro Dalcin <dalcinl at gmail.com> writes:

> >> > How do you exactly want to implement that? Totally replace these
> >> > special functions with the BIND(C) interface that calls directly the
> >> > function, or rather generate a native Fortran subroutine that calls
> >> > the C function through a BIND(C) interface?
> >
> >> The latter.  Usage should not change for existing Fortran users.
> >
> > Things may end up being involved anyway, even if using ISO_C_BINDINGS.
> >
> > http://fortranwiki.org/fortran/show/Generating+C+Interfaces#strings

> I guess I don't understand.  Are you concerned about the string copying?
> Note that FIXCHAR (used in current interfaces) allocates memory.

Well, no, my point is that an automatic interface generator based on
ISO_C_BINDINGS (as Barry wanted) may prove slightly harder to implement
than expected.

Lisandro Dalcin
Research Scientist
Computer, Electrical and Mathematical Sciences & Engineering (CEMSE)
Extreme Computing Research Center (ECRC)
King Abdullah University of Science and Technology (KAUST)

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