1 /*
2 * have_ban_pragma.c - Determine if we have #pragma GCC poison func_name
3 *
4 * Copyright (C) 2021 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 * Under source code control: 2021/03/08 01:02:34
21 * File existed as early as: 2021
22 *
23 * chongo <was here> /\oo/\ http://www.isthe.com/chongo/
24 * Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
25 */
26
27 /*
28 * usage:
29 * have_ban_pragma
30 *
31 * Not all systems have #pragma GCC poison func_name, so this may not
32 * compile on your system.
33 *
34 * This prog outputs several defines:
35 *
36 * HAVE_PRAGMA_GCC_POSION
37 * defined ==> use #pragma GCC poison func_name
38 * undefined ==> do not use #pragma GCC poison func_name
39 *
40 * NOTE: Modern clang compilers allow for 'pragma GCC poison func_name'.
41 * This is NOT simply a GCC feature.
42 */
43
44 #include <stdio.h>
45
46
47 /* undef UNBAN to be undefined to force use of banned.h */
48 #undef UNBAN
49
50 /* prevent banned.h from including have_ban_pragma.h */
51 #define PRE_HAVE_BAN_PRAGMA_H
52
53 #include "banned.h" /* include after system header <> includes */
54
55
56 int
main(void)57 main(void)
58 {
59 #if defined(HAVE_NO_PRAGMA_GCC_POSION)
60
61 printf("#undef HAVE_PRAGMA_GCC_POSION /* no */\n");
62
63 #else /* HAVE_NO_PRAGMA_GCC_POSION */
64
65 printf("#define HAVE_PRAGMA_GCC_POSION /* yes */\n");
66
67 #endif /* HAVE_NO_PRAGMA_GCC_POSION */
68
69 /* exit(0); */
70 return 0;
71 }
72