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      1 /*	$NetBSD: cdefs.h,v 1.3 2022/04/03 01:10:58 christos Exp $	*/
      2 
      3 /* cdefs.h
      4 
      5    Standard C definitions... */
      6 
      7 /*
      8  * Copyright (c) 1995 RadioMail Corporation.  All rights reserved.
      9  * Copyright (C) 2004-2022 Internet Systems Consortium, Inc. ("ISC")
     10  * Copyright (c) 1996-2003 by Internet Software Consortium
     11  *
     12  * This Source Code Form is subject to the terms of the Mozilla Public
     13  * License, v. 2.0. If a copy of the MPL was not distributed with this
     14  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
     17  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
     19  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     20  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     21  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
     22  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     23  *
     24  *   Internet Systems Consortium, Inc.
     25  *   PO Box 360
     26  *   Newmarket, NH 03857 USA
     27  *   <info (at) isc.org>
     28  *   https://www.isc.org/
     29  *
     30  * This software was written for RadioMail Corporation by Ted Lemon
     31  * under a contract with Vixie Enterprises.   Further modifications have
     32  * been made for Internet Systems Consortium under a contract
     33  * with Vixie Laboratories.
     34  */
     35 
     36 #if !defined (__ISC_DHCP_CDEFS_H__)
     37 #define __ISC_DHCP_CDEFS_H__
     38 /* Delete attributes if not gcc or not the right version of gcc. */
     39 #if !defined(__GNUC__) || __GNUC__ < 2 || \
     40         (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || defined (darwin)
     41 #define __attribute__(x)
     42 #endif
     43 
     44 /* The following macro handles the case of unwanted return values.  In
     45  * GCC one can specify an attribute for a function to generate a warning
     46  * if the return value of the function is ignored and one can't dispose of
     47  * the warning by the use of void.  In conjunction with the use of -Werror
     48  * these warnings prohibit the compilation of the package.  This macro
     49  * allows us to assign the return value to a variable and then ignore it.
     50  *
     51  * __attribute__((unused)) is added for avoiding another warning about set,
     52  * but unused variable. This is produced by unused-but-set-variable switch
     53  * that is enabled by default in gcc 4.6.
     54  */
     55 #if !defined(__GNUC__) || (__GNUC__ < 4)
     56 #define IGNORE_RET(x) (void) x
     57 #else
     58 #define IGNORE_RET(x)			\
     59 	do {				\
     60                 int __attribute__((unused)) ignore_return ;\
     61                 ignore_return = x;                         \
     62 	} while (0)
     63 #endif
     64 
     65 /* This macro is defined to avoid unused-but-set-variable warning
     66  * that is enabled in gcc 4.6
     67  */
     68 
     69 #define IGNORE_UNUSED(x) { x = x; }
     70 
     71 #endif /* __ISC_DHCP_CDEFS_H__ */
     72