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