varattrs.h - master - githubmirror/libpcap

varattrs.h
59 строк2 KB
Guy Harris
Use compiler tests to determine how to define _U_.
16 ноя 2017, 01:21
16 ноя 2017, 01:2111d0ea4
/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
/*
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 *	Engineering Group at Lawrence Berkeley Laboratory.
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#ifndef varattrs_h
#define varattrs_h

#include <pcap/compiler-tests.h>

/*
 * Attributes to apply to variables, using various compiler-specific
 * extensions.
 */

#if __has_attribute(unused) \
    || PCAP_IS_AT_LEAST_GNUC_VERSION(2,0)
  /*
   * Compiler with support for __attribute__((unused)), or GCC 2.0 and
   * later, so it supports __attribute__((unused)).
   */
  #define _U_ __attribute__((unused))
#else
  /*
   * We don't know of any way to mark a variable as unused.
   */
  #define _U_
#endif

#endif