The Tcpdump Group git mirrors - libpcap/blob - diag-control.h

   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   #if defined(_MSC_VER)
 125     /*
 126      * This is Microsoft Visual Studio; we can use
 127      * __pragma(warning(disable:XXXX)) and __pragma(warning(push/pop)).
 128      *
 129      * Suppress unreachable code warnings.
 130      */
 131     #define DIAG_OFF_BISON_BYACC \
 132       __pragma(warning(push)) \
 133       __pragma(warning(disable:4702))
 134     #define DIAG_ON_BISON_BYACC  __pragma(warning(pop))
 135   #elif PCAP_IS_AT_LEAST_CLANG_VERSION(2,8)
 136     /*
 137      * This is Clang 2.8 or later; we can use "clang diagnostic
 138      * ignored -Wxxx" and "clang diagnostic push/pop".
 139      */
 140     #define DIAG_OFF_BISON_BYACC \
 141       PCAP_DO_PRAGMA(clang diagnostic push) \
 142       PCAP_DO_PRAGMA(clang diagnostic ignored "-Wshadow") \
 143       PCAP_DO_PRAGMA(clang diagnostic ignored "-Wunreachable-code")
 144     #define DIAG_ON_BISON_BYACC \
 145       PCAP_DO_PRAGMA(clang diagnostic pop)
 146   #elif PCAP_IS_AT_LEAST_GNUC_VERSION(4,6)
 147     /*
 148      * This is GCC 4.6 or later, or a compiler claiming to be that.
 149      * We can use "GCC diagnostic ignored -Wxxx" (introduced in 4.2)
 150      * and "GCC diagnostic push/pop" (introduced in 4.6).
 151      */
 152     #define DIAG_OFF_BISON_BYACC \
 153       PCAP_DO_PRAGMA(GCC diagnostic push) \
 154       PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wshadow") \
 155       PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wunreachable-code")
 156     #define DIAG_ON_BISON_BYACC \
 157       PCAP_DO_PRAGMA(GCC diagnostic pop)
 158   #else
 159     /*
 160      * Neither Clang 2.8 or later nor GCC 4.6 or later or a compiler
 161      * claiming to be that; there's nothing we know of that we can do.
 162      */
 163     #define DIAG_OFF_BISON_BYACC
 164     #define DIAG_ON_BISON_BYACC
 165   #endif
 166 #else
 167   /*
 168    * Bison.
 169    */
 170   #if defined(_MSC_VER)
 171     /*
 172      * This is Microsoft Visual Studio; we can use
 173      * __pragma(warning(disable:XXXX)) and __pragma(warning(push/pop)).
 174      *
 175      * Suppress some /Wall warnings.
 176      */
 177     #define DIAG_OFF_BISON_BYACC \
 178       __pragma(warning(push)) \
 179       __pragma(warning(disable:4127)) \
 180       __pragma(warning(disable:4242)) \
 181       __pragma(warning(disable:4244)) \
 182       __pragma(warning(disable:4702))
 183     #define DIAG_ON_BISON_BYACC  __pragma(warning(pop))
 184   #elif PCAP_IS_AT_LEAST_CLANG_VERSION(2,8)
 185     /*
 186      * This is Clang 2.8 or later; we can use "clang diagnostic
 187      * ignored -Wxxx" and "clang diagnostic push/pop".
 188      */
 189     #define DIAG_OFF_BISON_BYACC \
 190       PCAP_DO_PRAGMA(clang diagnostic push) \
 191       PCAP_DO_PRAGMA(clang diagnostic ignored "-Wunreachable-code")
 192     #define DIAG_ON_BISON_BYACC \
 193       PCAP_DO_PRAGMA(clang diagnostic pop)
 194   #elif PCAP_IS_AT_LEAST_GNUC_VERSION(4,6)
 195     /*
 196      * This is GCC 4.6 or later, or a compiler claiming to be that.
 197      * We can use "GCC diagnostic ignored -Wxxx" (introduced in 4.2)
 198      * and "GCC diagnostic push/pop" (introduced in 4.6).
 199      */
 200     #define DIAG_OFF_BISON_BYACC \
 201       PCAP_DO_PRAGMA(GCC diagnostic push) \
 202       PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wunreachable-code")
 203     #define DIAG_ON_BISON_BYACC \
 204       PCAP_DO_PRAGMA(GCC diagnostic pop)
 205   #else
 206     /*
 207      * Neither Clang 2.8 or later nor GCC 4.6 or later or a compiler
 208      * claiming to be that; there's nothing we know of that we can do.
 209      */
 210     #define DIAG_OFF_BISON_BYACC
 211     #define DIAG_ON_BISON_BYACC
 212   #endif
 213 #endif
 214
 215 #endif /* _diag_control_h */