c_cpp/etc/calc/have_const.c

   1 /*
   2  * have_const - Determine if we want or can support ansi const
   3  *
   4  * Copyright (C) 1999  Landon Curt Noll
   5  *
   6  * Calc is open software; you can redistribute it and/or modify it under
   7  * the terms of the version 2.1 of the GNU Lesser General Public License
   8  * as published by the Free Software Foundation.
   9  *
  10  * Calc is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
  13  * Public License for more details.
  14  *
  15  * A copy of version 2.1 of the GNU Lesser General Public License is
  16  * distributed with calc under the filename COPYING-LGPL.  You should have
  17  * received a copy with calc; if not, write to Free Software Foundation, Inc.
  18  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  *
  20  * @(#) $Revision: 30.1 $
  21  * @(#) $Id: have_const.c,v 30.1 2007/03/16 11:09:46 chongo Exp $
  22  * @(#) $Source: /usr/local/src/bin/calc/RCS/have_const.c,v $
  23  *
  24  * Under source code control:   1995/04/22 13:18:44
  25  * File existed as early as:    1995
  26  *
  27  * chongo <was here> /\oo/\     http://www.isthe.com/chongo/
  28  * Share and enjoy!  :-)        http://www.isthe.com/chongo/tech/comp/calc/
  29  */
  30
  31 /*
  32  * usage:
  33  *      have_const
  34  *
  35  * Not all compilers support const, so this may not compile on your system.
  36  *
  37  * This prog outputs several defines:
  38  *
  39  *      HAVE_CONST
  40  *              defined ==> ok to use const
  41  *              undefined ==> do not use const
  42  *
  43  *      CONST
  44  *              const ==> use const
  45  *              (nothing) ==> const not used
  46  */
  47
  48
  49 #include <stdio.h>
  50
  51 int
  52 main(void)
  53 {
  54 #if defined(HAVE_NO_CONST)
  55
  56         printf("#undef HAVE_CONST /* no */\n");
  57         printf("#undef CONST\n");
  58         printf("#define CONST /* no */\n");
  59
  60 #else /* HAVE_NO_CONST */
  61
  62         const char * const str = "const";
  63
  64         printf("#define HAVE_CONST /* yes */\n");
  65         printf("#undef CONST\n");
  66         printf("#define CONST %s /* yes */\n", str);
  67
  68 #endif /* HAVE_NO_CONST */
  69
  70         /* exit(0); */
  71         return 0;
  72 }