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 /*
  41  * Berkeley YACC generates a global declaration of yylval, or the
  42  * appropriately prefixed version of yylval, in grammar.h, *even
  43  * though it's been told to generate a pure parser, meaning it
  44  * doesn't have any global variables*.  Bison doesn't do this.
  45  *
  46  * That causes a warning due to the local declaration in the parser
  47  * shadowing the global declaration.
  48  *
  49  * So, if this is Berkeley YACC, and we have _Pragma, and have pragmas
  50  * to suppress diagnostics, we use it to turn off -Wshadow warnings.
  51  */
  52 #ifdef YYBYACC
  53   #define PCAP_DO_PRAGMA(x) _Pragma (#x)
  54   #if PCAP_IS_AT_LEAST_CLANG_VERSION(2,8)
  55     /*
  56      * This is Clang 2.8 or later; we can use "clang diagnostic
  57      * ignored -Wxxx" and "clang diagnostic push/pop".
  58      */
  59     #define DIAG_OFF_BYACC \
  60       PCAP_DO_PRAGMA(clang diagnostic push) \
  61       PCAP_DO_PRAGMA(clang diagnostic ignored "-Wshadow")
  62     #define DIAG_ON_BYACC \
  63     PCAP_DO_PRAGMA(clang diagnostic pop)
  64   #elif PCAP_IS_AT_LEAST_GNUC_VERSION(4,2)
  65     /*
  66      * This is GCC 4.2 or later, or a compiler claiming to be that.
  67      * We can use "GCC diagnostic ignored -Wxxx".
  68      */
  69     #define DIAG_OFF_BYACC \
  70       PCAP_DO_PRAGMA(GCC diagnostic push) \
  71       PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wshadow")
  72     #define DIAG_ON_BYACC \
  73       PCAP_DO_PRAGMA(GCC diagnostic pop)
  74   #else
  75     /*
  76      * Neither Clang 2.8 or later nor GCC 4.2 or later or a compiler
  77      * claiming to be that; there's nothing we know of that we can do.
  78      */
  79     #define DIAG_OFF_BYACC
  80     #define DIAG_ON_BYACC
  81   #endif
  82 #else
  83   /*
  84    * Not Berkeley YACC, so no warnings to worry about.
  85    */
  86   #define DIAG_OFF_BYACC
  87   #define DIAG_ON_BYACC
  88 #endif
  89
  90 #endif /* _diag_control_h */