Mark Clements wrote;
>
> For 2), the functionality is potentially interesting -- albeit
> orthogonal to most uses and users. I found an example of some calling
> code at:
>
> http://axiom-wiki.newsynthesis.org/images/axiom--test--1/src/algebra/c05.spad.tex
>
> I agree that this is ugly. I tried to debug the code with:
>
> )expose FORT
> )boot $addUnderscoreToFortranNames := true
> )boot $fortranDirectory := nil
> )boot $fortranLibraries := '"-lm"
> )boot $fortranTmpDir := '"/tmp/"
> )boot $fortranCompilerName := '"gfortran"
> -- the following is incorrectly specified
> )boot makeFort("test",[], [], [], [], [])
>
> This gave a system error: "The function BOOT::SYSTEM is undefined".
As I wrote the code is non-working. And if we want to call Fortran
there is better way. I do not know why NAG did things in so
complicated way, possible because they did not want to depend
on dynamical loading of libraries. Another possiblity is
that they wanted capability of calling functions on remote
machines. Currently FriCAS needs dynamical loading anyway,
so we could use it for calling Fortran code. And for running
code on remote machines there are established ways which
we shall use in case we want to have such functionality.
To clarify: the alternatives I mention need implementing, but
implementing them is probably less effort than trying to
resurect NAG interface code.
> naive question, what is a standard way of calling an OS function in
> boot?
OBEY. This is wrapper to OS and Lisp dependent specific function.
For serious work we probably need better interface, but existence
of Windows means that we can not make that really smooth, there
will be ugly differences.
> I assume that NAG spent considerable effort to get the Fortran code to
> work - and it seems a pity to throw all of this away, although this
> would have an opportunity cost.
Several years ago NAG folks discouraged us from using old
interface code -- apparently they were also not satisfied
with the code.
--
Waldek Hebisch
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