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Annotation of embedaddon/dhcp/includes/cdefs.h, revision 1.1.1.1

1.1       misho       1: /* cdefs.h
                      2: 
                      3:    Standard C definitions... */
                      4: 
                      5: /*
                      6:  * Copyright (c) 1995 RadioMail Corporation.  All rights reserved.
1.1.1.1 ! misho       7:  * Copyright (c) 2011,2012 by Internet Systems Consortium, Inc. ("ISC")
1.1       misho       8:  * Copyright (c) 2004,2009 by Internet Systems Consortium, Inc. ("ISC")
                      9:  * Copyright (c) 1996-2003 by Internet Software Consortium
                     10:  *
                     11:  * Permission to use, copy, modify, and distribute this software for any
                     12:  * purpose with or without fee is hereby granted, provided that the above
                     13:  * copyright notice and this permission notice appear in all copies.
                     14:  *
                     15:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
                     16:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     17:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
                     18:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     19:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     20:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
                     21:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     22:  *
                     23:  *   Internet Systems Consortium, Inc.
                     24:  *   950 Charter Street
                     25:  *   Redwood City, CA 94063
                     26:  *   <info@isc.org>
                     27:  *   https://www.isc.org/
                     28:  *
                     29:  * This software was written for RadioMail Corporation by Ted Lemon
                     30:  * under a contract with Vixie Enterprises.   Further modifications have
                     31:  * been made for Internet Systems Consortium under a contract
                     32:  * with Vixie Laboratories.
                     33:  */
                     34: 
                     35: #if !defined (__ISC_DHCP_CDEFS_H__)
                     36: #define __ISC_DHCP_CDEFS_H__
                     37: /* Delete attributes if not gcc or not the right version of gcc. */
                     38: #if !defined(__GNUC__) || __GNUC__ < 2 || \
                     39:         (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || defined (darwin)
                     40: #define __attribute__(x)
                     41: #endif
                     42: 
                     43: /* The following macro handles the case of unwanted return values.  In
                     44:  * GCC one can specify an attribute for a function to generate a warning
                     45:  * if the return value of the function is ignored and one can't dispose of
                     46:  * the warning by the use of void.  In conjunction with the use of -Werror
                     47:  * these warnings prohibit the compilation of the package.  This macro
                     48:  * allows us to assign the return value to a variable and then ignore it.
1.1.1.1 ! misho      49:  *
        !            50:  * __attribute__((unused)) is added for avoiding another warning about set,
        !            51:  * but unused variable. This is produced by unused-but-set-variable switch
        !            52:  * that is enabled by default in gcc 4.6.
1.1       misho      53:  */
                     54: #if !defined(__GNUC__) || (__GNUC__ < 4)
                     55: #define IGNORE_RET(x) (void) x
                     56: #else
                     57: #define IGNORE_RET(x)                  \
                     58:        do {                            \
1.1.1.1 ! misho      59:                 int __attribute__((unused)) ignore_return ;\
        !            60:                 ignore_return = x;                         \
1.1       misho      61:        } while (0)
                     62: #endif
                     63: 
1.1.1.1 ! misho      64: /* This macro is defined to avoid unused-but-set-variable warning
        !            65:  * that is enabled in gcc 4.6 
        !            66:  */
        !            67: 
        !            68: #define IGNORE_UNUSED(x) { x = x; }
        !            69: 
1.1       misho      70: #endif /* __ISC_DHCP_CDEFS_H__ */