From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Online hackathon ?
Date: Thu, 29 Aug 2013 15:35:20 +0200
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To: Andreas Enge <andreas@enge.fr>
Cc: guix-devel@gnu.org

Andreas Enge <andreas@enge.fr> skribis:

> On Wed, Aug 28, 2013 at 10:53:53PM +0200, Ludovic Court=C3=A8s wrote:
>> The second thing is GNU packages.  Some of the trickier but more
>> interesting include TeXmacs, Octave, and R, for instance.
>
> Octave requires gfortran. How can this be activated in our gcc used for
> building packages?

I=E2=80=99d be in favor or creating a separate package derived from gcc tha=
t has
Fortran enabled:

  (define-public gfortran
    (package (inherit gcc-4.8)
      (name "gfortran")
      (arguments
        ;; something that does --enable-languages=3Dfortran
        )))

For code that fiddles with --enable-languages, see the definition of
=E2=80=98gcc-boot0=E2=80=99 in base.scm.

Probably this should be factorized and made available in a nicer way:

  (define (gcc #:key (languages '("c" "c++")))
    "Return a GCC with the given LANGUAGES..."
    (package ...
       ...))

HTH,
Ludo=E2=80=99.