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70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
/* cdefs.h
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Standard C definitions... */
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/*
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* Copyright (c) 1995 RadioMail Corporation. All rights reserved.
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* Copyright (C) 2004-2022 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1996-2003 by Internet Software Consortium
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Internet Systems Consortium, Inc.
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* PO Box 360
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* Newmarket, NH 03857 USA
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* <info@isc.org>
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* https://www.isc.org/
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*
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* This software was written for RadioMail Corporation by Ted Lemon
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* under a contract with Vixie Enterprises. Further modifications have
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* been made for Internet Systems Consortium under a contract
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* with Vixie Laboratories.
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*/
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#if !defined (__ISC_DHCP_CDEFS_H__)
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#define __ISC_DHCP_CDEFS_H__
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/* Delete attributes if not gcc or not the right version of gcc. */
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#if !defined(__GNUC__) || __GNUC__ < 2 || \
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(__GNUC__ == 2 && __GNUC_MINOR__ < 5) || defined (darwin)
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#define __attribute__(x)
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#endif
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/* The following macro handles the case of unwanted return values. In
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* GCC one can specify an attribute for a function to generate a warning
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* if the return value of the function is ignored and one can't dispose of
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* the warning by the use of void. In conjunction with the use of -Werror
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* these warnings prohibit the compilation of the package. This macro
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* allows us to assign the return value to a variable and then ignore it.
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*
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* __attribute__((unused)) is added for avoiding another warning about set,
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* but unused variable. This is produced by unused-but-set-variable switch
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* that is enabled by default in gcc 4.6.
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*/
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#if !defined(__GNUC__) || (__GNUC__ < 4)
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#define IGNORE_RET(x) (void) x
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#else
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#define IGNORE_RET(x) \
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do { \
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int __attribute__((unused)) ignore_return ;\
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ignore_return = x; \
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} while (0)
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#endif
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/* This macro is defined to avoid unused-but-set-variable warning
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* that is enabled in gcc 4.6
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*/
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#define IGNORE_UNUSED(x) { x = x; }
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#endif /* __ISC_DHCP_CDEFS_H__ */
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