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    * Suppress signed-vs-unsigned comparison and narrowing warnings.
  56    */
  57   #define DIAG_OFF_FLEX \
  58     __pragma(warning(push)) \
  59     __pragma(warning(disable:4127)) \
  60     __pragma(warning(disable:4242)) \
  61     __pragma(warning(disable:4244))
  62   #define DIAG_ON_FLEX  __pragma(warning(pop))
  63 #else
  64   /*
  65    * Suppress -Wsigned-compare warnings.
  66    *
  67    * Suppress -Wdocumentation warnings with Clang; GCC doesn't
  68    * support -Wdocumentation, at least according to the GCC 7.3
  69    * documentation.  Apparently, Flex generates code that upsets
  70    * at least some versions of Clang's -Wdocumentation.
  71    */
  72   #if PCAP_IS_AT_LEAST_CLANG_VERSION(2,8)
  73     /*
  74      * This is Clang 2.8 or later; we can use "clang diagnostic
  75      * ignored -Wxxx" and "clang diagnostic push/pop".
  76      */
  77     #define DIAG_OFF_FLEX \
  78       PCAP_DO_PRAGMA(clang diagnostic push) \
  79       PCAP_DO_PRAGMA(clang diagnostic ignored "-Wsign-compare") \
  80       PCAP_DO_PRAGMA(clang diagnostic ignored "-Wdocumentation") \
  81       PCAP_DO_PRAGMA(clang diagnostic ignored "-Wmissing-noreturn") \
  82       PCAP_DO_PRAGMA(clang diagnostic ignored "-Wunused-parameter")
  83     #define DIAG_ON_FLEX \
  84       PCAP_DO_PRAGMA(clang diagnostic pop)
  85   #elif PCAP_IS_AT_LEAST_GNUC_VERSION(4,6)
  86     /*
  87      * This is GCC 4.6 or later, or a compiler claiming to be that.
  88      * We can use "GCC diagnostic ignored -Wxxx" (introduced in 4.2)
  89      * and "GCC diagnostic push/pop" (introduced in 4.6).
  90      */
  91     #define DIAG_OFF_FLEX \
  92       PCAP_DO_PRAGMA(GCC diagnostic push) \
  93       PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wsign-compare") \
  94       PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wunused-parameter")
  95     #define DIAG_ON_FLEX \
  96       PCAP_DO_PRAGMA(GCC diagnostic pop)
  97   #else
  98     /*
  99      * Neither Clang 2.8 or later nor GCC 4.6 or later or a compiler
 100      * claiming to be that; there's nothing we know of that we can do.
 101      */
 102     #define DIAG_OFF_FLEX
 103     #define DIAG_ON_FLEX
 104   #endif
 105 #endif
 106
 107 #ifdef YYBYACC
 108   /*
 109    * Berkeley YACC.
 110    *
 111    * It generates a global declaration of yylval, or the appropriately
 112    * prefixed version of yylval, in grammar.h, *even though it's been
 113    * told to generate a pure parser, meaning it doesn't have any global
 114    * variables*.  Bison doesn't do this.
 115    *
 116    * That causes a warning due to the local declaration in the parser
 117    * shadowing the global declaration.
 118    *
 119    * So, if we have _Pragma, and have pragmas to suppress diagnostics,
 120    * we use it to turn off -Wshadow warnings.
 121    */
 122   #if PCAP_IS_AT_LEAST_CLANG_VERSION(2,8)
 123     /*
 124      * This is Clang 2.8 or later; we can use "clang diagnostic
 125      * ignored -Wxxx" and "clang diagnostic push/pop".
 126      */
 127     #define DIAG_OFF_BISON_BYACC \
 128       PCAP_DO_PRAGMA(clang diagnostic push) \
 129       PCAP_DO_PRAGMA(clang diagnostic ignored "-Wshadow")
 130     #define DIAG_ON_BISON_BYACC \
 131       PCAP_DO_PRAGMA(clang diagnostic pop)
 132   #elif PCAP_IS_AT_LEAST_GNUC_VERSION(4,6)
 133     /*
 134      * This is GCC 4.6 or later, or a compiler claiming to be that.
 135      * We can use "GCC diagnostic ignored -Wxxx" (introduced in 4.2)
 136      * and "GCC diagnostic push/pop" (introduced in 4.6).
 137      */
 138     #define DIAG_OFF_BISON_BYACC \
 139       PCAP_DO_PRAGMA(GCC diagnostic push) \
 140       PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wshadow")
 141     #define DIAG_ON_BISON_BYACC \
 142       PCAP_DO_PRAGMA(GCC diagnostic pop)
 143   #else
 144     /*
 145      * Neither Clang 2.8 or later nor GCC 4.6 or later or a compiler
 146      * claiming to be that; there's nothing we know of that we can do.
 147      */
 148     #define DIAG_OFF_BISON_BYACC
 149     #define DIAG_ON_BISON_BYACC
 150   #endif
 151 #else
 152   /*
 153    * Bison.
 154    */
 155   #if defined(_MSC_VER)
 156     /*
 157      * Suppress some /Wall warnings.
 158      */
 159     #define DIAG_OFF_BISON_BYACC \
 160       __pragma(warning(push)) \
 161       __pragma(warning(disable:4127)) \
 162       __pragma(warning(disable:4242)) \
 163       __pragma(warning(disable:4244)) \
 164       __pragma(warning(disable:4702))
 165     #define DIAG_ON_BISON_BYACC  __pragma(warning(pop))
 166   #else
 167     /*
 168      * Nothing to suppress.
 169      */
 170     #define DIAG_OFF_BISON_BYACC
 171     #define DIAG_ON_BISON_BYACC
 172   #endif
 173 #endif
 174
 175 #endif /* _diag_control_h */