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 _diag_control_h 36 #define _diag_control_h 37 38 #include "pcap/compiler-tests.h" 39 40 #ifndef _MSC_VER 41 /* 42 * Clang and GCC both support this way of putting pragmas into #defines. 43 * We don't use it unless we have a compiler that supports it; the 44 * warning-suppressing pragmas differ between Clang and GCC, so we test 45 * for both of those separately. 46 */ 47 #define PCAP_DO_PRAGMA(x) _Pragma (#x) 48 #endif 49 50 /* 51 * Suppress Flex warnings. 52 */ 53 #if defined(_MSC_VER) 54 /* 55 * This is Microsoft Visual Studio; we can use __pragma(warning(disable:XXXX)) 56 * and __pragma(warning(push/pop)). 57 * 58 * Suppress signed-vs-unsigned comparison, narrowing, and unreachable 59 * code warnings. 60 */ 61 #define DIAG_OFF_FLEX \ 62 __pragma(warning(push)) \ 63 __pragma(warning(disable:4127)) \ 64 __pragma(warning(disable:4242)) \ 65 __pragma(warning(disable:4244)) \ 66 __pragma(warning(disable:4702)) 67 #define DIAG_ON_FLEX __pragma(warning(pop)) 68 #elif PCAP_IS_AT_LEAST_CLANG_VERSION(2,8) 69 /* 70 * This is Clang 2.8 or later; we can use "clang diagnostic 71 * ignored -Wxxx" and "clang diagnostic push/pop". 72 * 73 * Suppress -Wdocumentation warnings; GCC doesn't support -Wdocumentation, 74 * at least according to the GCC 7.3 documentation. Apparently, Flex 75 * generates code that upsets at least some versions of Clang's 76 * -Wdocumentation. 77 */ 78 #define DIAG_OFF_FLEX \ 79 PCAP_DO_PRAGMA(clang diagnostic push) \ 80 PCAP_DO_PRAGMA(clang diagnostic ignored "-Wsign-compare") \ 81 PCAP_DO_PRAGMA(clang diagnostic ignored "-Wdocumentation") \ 82 PCAP_DO_PRAGMA(clang diagnostic ignored "-Wmissing-noreturn") \ 83 PCAP_DO_PRAGMA(clang diagnostic ignored "-Wunused-parameter") \ 84 PCAP_DO_PRAGMA(clang diagnostic ignored "-Wunreachable-code") 85 #define DIAG_ON_FLEX \ 86 PCAP_DO_PRAGMA(clang diagnostic pop) 87 #elif PCAP_IS_AT_LEAST_GNUC_VERSION(4,6) 88 /* 89 * This is GCC 4.6 or later, or a compiler claiming to be that. 90 * We can use "GCC diagnostic ignored -Wxxx" (introduced in 4.2) 91 * and "GCC diagnostic push/pop" (introduced in 4.6). 92 */ 93 #define DIAG_OFF_FLEX \ 94 PCAP_DO_PRAGMA(GCC diagnostic push) \ 95 PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wsign-compare") \ 96 PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wunused-parameter") \ 97 PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wunreachable-code") 98 #define DIAG_ON_FLEX \ 99 PCAP_DO_PRAGMA(GCC diagnostic pop) 100 #else 101 /* 102 * Neither Visual Studio, nor Clang 2.8 or later, nor GCC 4.6 or later 103 * or a compiler claiming to be that; there's nothing we know of that 104 * we can do. 105 */ 106 #define DIAG_OFF_FLEX 107 #define DIAG_ON_FLEX 108 #endif 109 110 #ifdef YYBYACC 111 /* 112 * Berkeley YACC. 113 * 114 * It generates a global declaration of yylval, or the appropriately 115 * prefixed version of yylval, in grammar.h, *even though it's been 116 * told to generate a pure parser, meaning it doesn't have any global 117 * variables*. Bison doesn't do this. 118 * 119 * That causes a warning due to the local declaration in the parser 120 * shadowing the global declaration. 121 * 122 * So, if the compiler warns about that, we turn off -Wshadow warnings. 123 * 124 * In addition, the generated code may have functions with unreachable 125 * code, so suppress warnings about those. 126 */ 127 #if defined(_MSC_VER) 128 /* 129 * This is Microsoft Visual Studio; we can use 130 * __pragma(warning(disable:XXXX)) and __pragma(warning(push/pop)). 131 */ 132 #define DIAG_OFF_BISON_BYACC \ 133 __pragma(warning(push)) \ 134 __pragma(warning(disable:4702)) 135 #define DIAG_ON_BISON_BYACC __pragma(warning(pop)) 136 #elif PCAP_IS_AT_LEAST_CLANG_VERSION(2,8) 137 /* 138 * This is Clang 2.8 or later; we can use "clang diagnostic 139 * ignored -Wxxx" and "clang diagnostic push/pop". 140 */ 141 #define DIAG_OFF_BISON_BYACC \ 142 PCAP_DO_PRAGMA(clang diagnostic push) \ 143 PCAP_DO_PRAGMA(clang diagnostic ignored "-Wshadow") \ 144 PCAP_DO_PRAGMA(clang diagnostic ignored "-Wunreachable-code") 145 #define DIAG_ON_BISON_BYACC \ 146 PCAP_DO_PRAGMA(clang diagnostic pop) 147 #elif PCAP_IS_AT_LEAST_GNUC_VERSION(4,6) 148 /* 149 * This is GCC 4.6 or later, or a compiler claiming to be that. 150 * We can use "GCC diagnostic ignored -Wxxx" (introduced in 4.2) 151 * and "GCC diagnostic push/pop" (introduced in 4.6). 152 */ 153 #define DIAG_OFF_BISON_BYACC \ 154 PCAP_DO_PRAGMA(GCC diagnostic push) \ 155 PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wshadow") \ 156 PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wunreachable-code") 157 #define DIAG_ON_BISON_BYACC \ 158 PCAP_DO_PRAGMA(GCC diagnostic pop) 159 #else 160 /* 161 * Neither Clang 2.8 or later nor GCC 4.6 or later or a compiler 162 * claiming to be that; there's nothing we know of that we can do. 163 */ 164 #define DIAG_OFF_BISON_BYACC 165 #define DIAG_ON_BISON_BYACC 166 #endif 167 #else 168 /* 169 * Bison. 170 * 171 * The generated code may have functions with unreachable code, so 172 * suppress warnings about those. 173 */ 174 #if defined(_MSC_VER) 175 /* 176 * This is Microsoft Visual Studio; we can use 177 * __pragma(warning(disable:XXXX)) and __pragma(warning(push/pop)). 178 * 179 * Suppress some /Wall warnings. 180 */ 181 #define DIAG_OFF_BISON_BYACC \ 182 __pragma(warning(push)) \ 183 __pragma(warning(disable:4127)) \ 184 __pragma(warning(disable:4242)) \ 185 __pragma(warning(disable:4244)) \ 186 __pragma(warning(disable:4702)) 187 #define DIAG_ON_BISON_BYACC __pragma(warning(pop)) 188 #elif PCAP_IS_AT_LEAST_CLANG_VERSION(2,8) 189 /* 190 * This is Clang 2.8 or later; we can use "clang diagnostic 191 * ignored -Wxxx" and "clang diagnostic push/pop". 192 */ 193 #define DIAG_OFF_BISON_BYACC \ 194 PCAP_DO_PRAGMA(clang diagnostic push) \ 195 PCAP_DO_PRAGMA(clang diagnostic ignored "-Wunreachable-code") 196 #define DIAG_ON_BISON_BYACC \ 197 PCAP_DO_PRAGMA(clang diagnostic pop) 198 #elif PCAP_IS_AT_LEAST_GNUC_VERSION(4,6) 199 /* 200 * This is GCC 4.6 or later, or a compiler claiming to be that. 201 * We can use "GCC diagnostic ignored -Wxxx" (introduced in 4.2) 202 * and "GCC diagnostic push/pop" (introduced in 4.6). 203 */ 204 #define DIAG_OFF_BISON_BYACC \ 205 PCAP_DO_PRAGMA(GCC diagnostic push) \ 206 PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wunreachable-code") 207 #define DIAG_ON_BISON_BYACC \ 208 PCAP_DO_PRAGMA(GCC diagnostic pop) 209 #else 210 /* 211 * Neither Clang 2.8 or later nor GCC 4.6 or later or a compiler 212 * claiming to be that; there's nothing we know of that we can do. 213 */ 214 #define DIAG_OFF_BISON_BYACC 215 #define DIAG_ON_BISON_BYACC 216 #endif 217 #endif 218 219 #endif /* _diag_control_h */ 220
