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 nd_compiler_tests_h 36 #define nd_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 ND_IS_AT_LEAST_GNUC_VERSION(major, minor) 0 84 #else 85 #define ND_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 Sun C/SunPro C/Oracle Studio major.minor 92 * or a later release. 93 * 94 * The version number in __SUNPRO_C is encoded in hex BCD, with the 95 * uppermost hex digit being the major version number, the next 96 * one or two hex digits being the minor version number, and 97 * the last digit being the patch version. 98 * 99 * It represents the *compiler* version, not the product version; 100 * see 101 * 102 * https://sourceforge.net/p/predef/wiki/Compilers/ 103 * 104 * for a partial mapping, which we assume continues for later 105 * 12.x product releases. 106 */ 107 108 #if ! defined(__SUNPRO_C) 109 #define ND_IS_AT_LEAST_SUNC_VERSION(major,minor) 0 110 #else 111 #define ND_SUNPRO_VERSION_TO_BCD(major, minor) \ 112 (((minor) >= 10) ? \ 113 (((major) << 12) | (((minor)/10) << 8) | (((minor)%10) << 4)) : \ 114 (((major) << 8) | ((minor) << 4))) 115 #define ND_IS_AT_LEAST_SUNC_VERSION(major,minor) \ 116 (__SUNPRO_C >= ND_SUNPRO_VERSION_TO_BCD((major), (minor))) 117 #endif 118 119 /* 120 * Check whether this is IBM XL C major.minor or a later release. 121 * 122 * The version number in __xlC__ has the major version in the 123 * upper 8 bits and the minor version in the lower 8 bits. 124 */ 125 126 #if ! defined(__xlC__) 127 #define ND_IS_AT_LEAST_XL_C_VERSION(major,minor) 0 128 #else 129 #define ND_IS_AT_LEAST_XL_C_VERSION(major, minor) \ 130 (__xlC__ >= (((major) << 8) | (minor))) 131 #endif 132 133 /* 134 * Check whether this is HP aC++/HP C major.minor or a later release. 135 * 136 * The version number in __HP_aCC is encoded in zero-padded decimal BCD, 137 * with the "A." stripped off, the uppermost two decimal digits being 138 * the major version number, the next two decimal digits being the minor 139 * version number, and the last two decimal digits being the patch version. 140 * (Strip off the A., remove the . between the major and minor version 141 * number, and add two digits of patch.) 142 */ 143 144 #if ! defined(__HP_aCC) 145 #define ND_IS_AT_LEAST_HP_C_VERSION(major,minor) 0 146 #else 147 #define ND_IS_AT_LEAST_HP_C_VERSION(major,minor) \ 148 (__HP_aCC >= ((major)*10000 + (minor)*100)) 149 #endif 150 151 #endif /* nd_funcattrs_h */ 152