1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ 2 /* 3 * Copyright (c) 1993, 1994, 1995, 1996, 1997 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the Computer Systems 17 * Engineering Group at Lawrence Berkeley Laboratory. 18 * 4. Neither the name of the University nor of the Laboratory may be used 19 * to endorse or promote products derived from this software without 20 * specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lib_pcap_compiler_tests_h 36 #define lib_pcap_compiler_tests_h 37 38 /* 39 * This was introduced by Clang: 40 * 41 * https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute 42 * 43 * in some version (which version?); it has been picked up by GCC 5.0. 44 */ 45 #ifndef __has_attribute 46 /* 47 * It's a macro, so you can check whether it's defined to check 48 * whether it's supported. 49 * 50 * If it's not, define it to always return 0, so that we move on to 51 * the fallback checks. 52 */ 53 #define __has_attribute(x) 0 54 #endif 55 56 /* 57 * Note that the C90 spec's "6.8.1 Conditional inclusion" and the 58 * C99 spec's and C11 spec's "6.10.1 Conditional inclusion" say: 59 * 60 * Prior to evaluation, macro invocations in the list of preprocessing 61 * tokens that will become the controlling constant expression are 62 * replaced (except for those macro names modified by the defined unary 63 * operator), just as in normal text. If the token "defined" is 64 * generated as a result of this replacement process or use of the 65 * "defined" unary operator does not match one of the two specified 66 * forms prior to macro replacement, the behavior is undefined. 67 * 68 * so you shouldn't use defined() in a #define that's used in #if or 69 * #elif. Some versions of Clang, for example, will warn about this. 70 * 71 * Instead, we check whether the pre-defined macros for particular 72 * compilers are defined and, if not, define the "is this version XXX 73 * or a later version of this compiler" macros as 0. 74 */ 75 76 /* 77 * Check whether this is GCC major.minor or a later release, or some 78 * compiler that claims to be "just like GCC" of that version or a 79 * later release. 80 */ 81 82 #if ! defined(__GNUC__) 83 #define PCAP_IS_AT_LEAST_GNUC_VERSION(major, minor) 0 84 #else 85 #define PCAP_IS_AT_LEAST_GNUC_VERSION(major, minor) \ 86 (__GNUC__ > (major) || \ 87 (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) 88 #endif 89 90 /* 91 * Check whether this is Clang major.minor or a later release. 92 */ 93 94 #if !defined(__clang__) 95 #define PCAP_IS_AT_LEAST_CLANG_VERSION(major, minor) 0 96 #else 97 #define PCAP_IS_AT_LEAST_CLANG_VERSION(major, minor) \ 98 (__clang_major__ > (major) || \ 99 (__clang_major__ == (major) && __clang_minor__ >= (minor))) 100 #endif 101 102 /* 103 * Check whether this is Sun C/SunPro C/Oracle Studio major.minor 104 * or a later release. 105 * 106 * The version number in __SUNPRO_C is encoded in hex BCD, with the 107 * uppermost hex digit being the major version number, the next 108 * one or two hex digits being the minor version number, and 109 * the last digit being the patch version. 110 * 111 * It represents the *compiler* version, not the product version; 112 * see 113 * 114 * https://sourceforge.net/p/predef/wiki/Compilers/ 115 * 116 * for a partial mapping, which we assume continues for later 117 * 12.x product releases. 118 */ 119 120 #if ! defined(__SUNPRO_C) 121 #define PCAP_IS_AT_LEAST_SUNC_VERSION(major,minor) 0 122 #else 123 #define PCAP_SUNPRO_VERSION_TO_BCD(major, minor) \ 124 (((minor) >= 10) ? \ 125 (((major) << 12) | (((minor)/10) << 8) | (((minor)%10) << 4)) : \ 126 (((major) << 8) | ((minor) << 4))) 127 #define PCAP_IS_AT_LEAST_SUNC_VERSION(major,minor) \ 128 (__SUNPRO_C >= PCAP_SUNPRO_VERSION_TO_BCD((major), (minor))) 129 #endif 130 131 /* 132 * Check whether this is IBM XL C major.minor or a later release. 133 * 134 * The version number in __xlC__ has the major version in the 135 * upper 8 bits and the minor version in the lower 8 bits. 136 */ 137 138 #if ! defined(__xlC__) 139 #define PCAP_IS_AT_LEAST_XL_C_VERSION(major,minor) 0 140 #else 141 #define PCAP_IS_AT_LEAST_XL_C_VERSION(major, minor) \ 142 (__xlC__ >= (((major) << 8) | (minor))) 143 #endif 144 145 /* 146 * Check whether this is HP aC++/HP C major.minor or a later release. 147 * 148 * The version number in __HP_aCC is encoded in zero-padded decimal BCD, 149 * with the "A." stripped off, the uppermost two decimal digits being 150 * the major version number, the next two decimal digits being the minor 151 * version number, and the last two decimal digits being the patch version. 152 * (Strip off the A., remove the . between the major and minor version 153 * number, and add two digits of patch.) 154 */ 155 156 #if ! defined(__HP_aCC) 157 #define PCAP_IS_AT_LEAST_HP_C_VERSION(major,minor) 0 158 #else 159 #define PCAP_IS_AT_LEAST_HP_C_VERSION(major,minor) \ 160 (__HP_aCC >= ((major)*10000 + (minor)*100)) 161 #endif 162 163 #endif /* lib_pcap_compiler_tests_h */ 164