/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */

/*

 * Copyright (c) 1993, 1994, 1995, 1996, 1997

 *	The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *	This product includes software developed by the Computer Systems

 *	Engineering Group at Lawrence Berkeley Laboratory.

 * 4. Neither the name of the University nor of the Laboratory may be used

 *    to endorse or promote products derived from this software without

 *    specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#ifndef lib_pcap_compiler_tests_h

#define lib_pcap_compiler_tests_h

/*

 * This was introduced by Clang:

 *

 *     http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute

 *

 * in some version (which version?); it has been picked up by GCC 5.0.

 */

#ifndef __has_attribute

  /*

   * It's a macro, so you can check whether it's defined to check

   * whether it's supported.

   *

   * If it's not, define it to always return 0, so that we move on to

   * the fallback checks.

   */

  #define __has_attribute(x) 0

#endif

/*

 * Note that the C90 spec's "6.8.1 Conditional inclusion" and the

 * C99 spec's and C11 spec's "6.10.1 Conditional inclusion" say:

 *

 *    Prior to evaluation, macro invocations in the list of preprocessing

 *    tokens that will become the controlling constant expression are

 *    replaced (except for those macro names modified by the defined unary

 *    operator), just as in normal text.  If the token "defined" is

 *    generated as a result of this replacement process or use of the

 *    "defined" unary operator does not match one of the two specified

 *    forms prior to macro replacement, the behavior is undefined.

 *

 * so you shouldn't use defined() in a #define that's used in #if or

 * #elif.  Some versions of Clang, for example, will warn about this.

 *

 * Instead, we check whether the pre-defined macros for particular

 * compilers are defined and, if not, define the "is this version XXX

 * or a later version of this compiler" macros as 0.

 */

/*

 * Check whether this is GCC major.minor or a later release, or some

 * compiler that claims to be "just like GCC" of that version or a

 * later release.

 */

#if ! defined(__GNUC__)

#define PCAP_IS_AT_LEAST_GNUC_VERSION(major, minor) 0

#else

#define PCAP_IS_AT_LEAST_GNUC_VERSION(major, minor) \

	(__GNUC__ > (major) || \

	 (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)))

#endif

/*

 * Check whether this is Clang major.minor or a later release.

 */

#if !defined(__clang__)

#define PCAP_IS_AT_LEAST_CLANG_VERSION(major, minor) 0

#else

#define PCAP_IS_AT_LEAST_CLANG_VERSION(major, minor) \

	(__clang_major__ > (major) || \

	 (__clang_major__ == (major) && __clang_minor__ >= (minor)))

#endif

/*

 * Check whether this is Sun C/SunPro C/Oracle Studio major.minor

 * or a later release.

 *

 * The version number in __SUNPRO_C is encoded in hex BCD, with the

 * uppermost hex digit being the major version number, the next

 * one or two hex digits being the minor version number, and

 * the last digit being the patch version.

 *

 * It represents the *compiler* version, not the product version;

 * see

 *

 *    https://sourceforge.net/p/predef/wiki/Compilers/

 *

 * for a partial mapping, which we assume continues for later

 * 12.x product releases.

 */

#if ! defined(__SUNPRO_C)

#define PCAP_IS_AT_LEAST_SUNC_VERSION(major,minor) 0

#else

#define PCAP_SUNPRO_VERSION_TO_BCD(major, minor) \

	(((minor) >= 10) ? \

	    (((major) << 12) | (((minor)/10) << 8) | (((minor)%10) << 4)) : \

	    (((major) << 8) | ((minor) << 4)))

#define PCAP_IS_AT_LEAST_SUNC_VERSION(major,minor) \

	(__SUNPRO_C >= PCAP_SUNPRO_VERSION_TO_BCD((major), (minor)))

#endif

/*

 * Check whether this is IBM XL C major.minor or a later release.

 *

 * The version number in __xlC__ has the major version in the

 * upper 8 bits and the minor version in the lower 8 bits.

 */

#if ! defined(__xlC__)

#define PCAP_IS_AT_LEAST_XL_C_VERSION(major,minor) 0

#else

#define PCAP_IS_AT_LEAST_XL_C_VERSION(major, minor) \

	(__xlC__ >= (((major) << 8) | (minor)))

#endif

/*

 * Check whether this is HP aC++/HP C major.minor or a later release.

 *

 * The version number in __HP_aCC is encoded in zero-padded decimal BCD,

 * with the "A." stripped off, the uppermost two decimal digits being

 * the major version number, the next two decimal digits being the minor

 * version number, and the last two decimal digits being the patch version.

 * (Strip off the A., remove the . between the major and minor version

 * number, and add two digits of patch.)

 */

#if ! defined(__HP_aCC)

#define PCAP_IS_AT_LEAST_HP_C_VERSION(major,minor) 0

#else

#define PCAP_IS_AT_LEAST_HP_C_VERSION(major,minor) \

	(__HP_aCC >= ((major)*10000 + (minor)*100))

#endif

#endif /* lib_pcap_compiler_tests_h */