lib/util/attr.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba utility functions
   4    Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef __UTIL_ATTR_H__
  21 #define __UTIL_ATTR_H__
  22
  23 /* for old gcc releases that don't have the feature test macro __has_attribute */
  24 #ifndef __has_attribute
  25 #define __has_attribute(x) 0
  26 #endif
  27
  28 #ifndef _UNUSED_
  29 #if __has_attribute(unused) || ( (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 ) )
  30 /** gcc attribute used on function parameters so that it does not emit
  31  * warnings about them being unused. **/
  32 #  define _UNUSED_ __attribute__ ((unused))
  33 #else
  34 #  define _UNUSED_
  35 #endif
  36 #endif
  37 #ifndef UNUSED
  38 #define UNUSED(param) param _UNUSED_
  39 #endif
  40
  41 #ifndef _DEPRECATED_
  42 #if __has_attribute(deprecated) || ( (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 ) )
  43 #define _DEPRECATED_ __attribute__ ((deprecated))
  44 #else
  45 #define _DEPRECATED_
  46 #endif
  47 #endif
  48
  49 #ifndef _WARN_UNUSED_RESULT_
  50 #if __has_attribute(warn_unused_result) || ( (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 ) )
  51 #define _WARN_UNUSED_RESULT_ __attribute__ ((warn_unused_result))
  52 #else
  53 #define _WARN_UNUSED_RESULT_
  54 #endif
  55 #endif
  56
  57 #ifndef _NORETURN_
  58 #if __has_attribute(noreturn) || ( (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 ) )
  59 #define _NORETURN_ __attribute__ ((noreturn))
  60 #else
  61 #define _NORETURN_
  62 #endif
  63 #endif
  64
  65 #ifndef _PURE_
  66 #if __has_attribute(pure) || ( (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 ) )
  67 #define _PURE_ __attribute__((pure))
  68 #else
  69 #define _PURE_
  70 #endif
  71 #endif
  72
  73 #ifndef NONNULL
  74 #if __has_attribute(nonnull) || ( (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 ) )
  75 #define NONNULL(param) param __attribute__((nonnull))
  76 #else
  77 #define NONNULL(param) param
  78 #endif
  79 #endif
  80
  81 #ifndef PRINTF_ATTRIBUTE
  82 #if __has_attribute(format) || ( (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 ) )
  83 /** Use gcc attribute to check printf fns.  a1 is the 1-based index of
  84  * the parameter containing the format, and a2 the index of the first
  85  * argument. Note that some gcc 2.x versions don't handle this
  86  * properly **/
  87 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
  88 #else
  89 #define PRINTF_ATTRIBUTE(a1, a2)
  90 #endif
  91 #endif
  92
  93 #ifndef FORMAT_ATTRIBUTE
  94 #if __has_attribute(format) || ( (__GNUC__ >= 3) && (__GNUC_MINOR__ >= 1 ) )
  95 /** Use gcc attribute to check printf fns.  a1 is argument to format()
  96  * in the above macro.  This is needed to support Heimdal's printf
  97  * decorations. Note that some gcc 2.x versions don't handle this
  98  * properly. **/
  99 #define FORMAT_ATTRIBUTE(a) __attribute__ ((format a))
 100 #else
 101 #define FORMAT_ATTRIBUTE(a)
 102 #endif
 103 #endif
 104
 105 #endif /* __UTIL_ATTR_H__ */