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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Interfacing Ada with C
Date: Sat, 24 Jul 2010 17:38:42 +0100
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Date: 2010-07-24T17:38:42+01:00
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Ada novice <posts@gmx.us> writes:

>     Having some background in C and in Ada, I would like to have some
> examples on how to interface codes between these two languages. I
> loved Ada but scientific computing libraries are not available. So I
> was thinking to use an available numeric library in C to do some
> mathematical operations such as calculations of eigenvalues and
> eigenvectors from data in an Ada program. Ada does provide some
> routines for eigenvalues and eigenvectors computations but they aren't
> suitable for a non-symmetric matrix.
>
> Information on interfacing Ada with C is scarce on the web and it
> would help much if I can get some simple examples here from which I
> can build up.

I think you have GNAT? Assuming that, you'll find their implementation
of Ada.Numerics.Generic_Real_Arrays in their Ada standard library;
you'll find this under the installation directory. On my Mac it's 
/opt/gnat-gpl-2010-x86_64/lib/gcc/x86_64-apple-darwin9.6.0/4.3.6/adainclude/a-ngrear.ad[sb]
but on a Windows machine it'll be something li
<install-dir>\<gnat-release>\lib\gcc\<architecture>\<gcc-release>\adainclude\a-ngrear.ad[sb]

This will lead you to System.Generic_Real_BLAS (s-gerebl.ad[sb]) and
System.Generic_Real_LAPACK (s-gerela.ad[sb]), which are interfaces to
the corresponding external libraries.


Not sure that these will fit your 'simple' criterion, though!

--S