MacOSX: ismac() implementation

[Thomas Treichl]

Hi,

in David's list

  http://www.nabble.com/Looking-for-help--tf4363692.html#a12440160

I've found that there should be a ismac() function. I've some questions how 
ismac() should be implemented: The easy way would be a function like the one 
that I've attached but I was also thinking about another implementation like the 
one for the MSVC version ie. feed through a #define from the CFLAGS in 
configure.in (eg. -DMACOSX) and then set or not set the values in src/toplev.cc 
DEFUN_DLD octave_config_info. The second solution would make more sense to me 
because then I could also send a patch for problems that may appear on the Mac 
platform and the different distributions must not patch the codes locally (eg. 
the A = [1:56]'/[1:56]' problem we've already discussed - I should also tell you 
that Apple is informed but I didn't get a fix yet and I think that older 
versions of Apple's vecLib won't be fixed at all, ie. people having a OSX 10.3 
system will have this bug also in the future). And the last question is: If 
ismac() then !isunix()? If so then other files must be changed too and I need to 
know...

  Thomas

## Copyright (C) 2007 Thomas Treichl
##
## This file is part of Octave.
##
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## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
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## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING.  If not, write to the Free
## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
## 02110-1301, USA.

## -*- texinfo -*-
## @deftypefn {Function File} {} ismac ()
## Return 1 if Octave is running on a Mac-like system and 0 otherwise.
## @end deftypefn

function retval = ismac ()

  vhost = octave_config_info ("canonical_host_type");
  if (regexp (vhost, '(.+)-apple-darwin(.+)'))
    retval = 1;
  else
    print_usage ();
  endif

endfunction