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dhcp 4.1 r7

    1: /* cdefs.h
    2: 
    3:    Standard C definitions... */
    4: 
    5: /*
    6:  * Copyright (c) 1995 RadioMail Corporation.  All rights reserved.
    7:  * Copyright (c) 2011,2012 by Internet Systems Consortium, Inc. ("ISC")
    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.
   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.
   53:  */
   54: #if !defined(__GNUC__) || (__GNUC__ < 4)
   55: #define IGNORE_RET(x) (void) x
   56: #else
   57: #define IGNORE_RET(x)			\
   58: 	do {				\
   59:                 int __attribute__((unused)) ignore_return ;\
   60:                 ignore_return = x;                         \
   61: 	} while (0)
   62: #endif
   63: 
   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: 
   70: #endif /* __ISC_DHCP_CDEFS_H__ */