diag-control.h

/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
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 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
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#ifndef _diag_control_h
#define _diag_control_h

#include "pcap/compiler-tests.h"

/*
 * Berkeley YACC generates a global declaration of yylval, or the
 * appropriately prefixed version of yylval, in grammar.h, *even
 * though it's been told to generate a pure parser, meaning it
 * doesn't have any global variables*.  Bison doesn't do this.
 *
 * That causes a warning due to the local declaration in the parser
 * shadowing the global declaration.
 *
 * So, if this is Berkeley YACC, and we have _Pragma, and have pragmas
 * to suppress diagnostics, we use it to turn off -Wshadow warnings.
 */
#ifdef YYBYACC
  #define PCAP_DO_PRAGMA(x) _Pragma (#x)
  #if PCAP_IS_AT_LEAST_CLANG_VERSION(2,8)
    /*
     * This is Clang 2.8 or later; we can use "clang diagnostic
     * ignored -Wxxx" and "clang diagnostic push/pop".
     */
    #define DIAG_OFF_BYACC \
      PCAP_DO_PRAGMA(clang diagnostic push) \
      PCAP_DO_PRAGMA(clang diagnostic ignored "-Wshadow")
    #define DIAG_ON_BYACC \
    PCAP_DO_PRAGMA(clang diagnostic pop)
  #elif PCAP_IS_AT_LEAST_GNUC_VERSION(4,2)
    /*
     * This is GCC 4.2 or later, or a compiler claiming to be that.
     * We can use "GCC diagnostic ignored -Wxxx".
     */
    #define DIAG_OFF_BYACC \
      PCAP_DO_PRAGMA(GCC diagnostic push) \
      PCAP_DO_PRAGMA(GCC diagnostic ignored "-Wshadow")
    #define DIAG_ON_BYACC \
      PCAP_DO_PRAGMA(GCC diagnostic pop)
  #else
    /*
     * Neither Clang 2.8 or later nor GCC 4.2 or later or a compiler
     * claiming to be that; there's nothing we know of that we can do.
     */
    #define DIAG_OFF_BYACC
    #define DIAG_ON_BYACC
  #endif
#else
  /*
   * Not Berkeley YACC, so no warnings to worry about.
   */
  #define DIAG_OFF_BYACC
  #define DIAG_ON_BYACC
#endif

#endif /* _diag_control_h */