lib/compiler.h

   1 /*
   2  * Copyright (c) 2015-2017  David Lamparter, for NetDEF, Inc.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #ifndef _FRR_COMPILER_H
  18 #define _FRR_COMPILER_H
  19
  20 #ifdef __cplusplus
  21 extern "C" {
  22 #endif
  23
  24 /* function attributes, use like
  25  *   void prototype(void) __attribute__((_CONSTRUCTOR(100)));
  26  */
  27 #if defined(__clang__)
  28 #if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 5)
  29 #  define _RET_NONNULL    , returns_nonnull
  30 #endif
  31 #if __has_attribute(fallthrough)
  32 #  define _FALLTHROUGH __attribute__((fallthrough));
  33 #endif
  34 # define _CONSTRUCTOR(x)  constructor(x)
  35 #elif defined(__GNUC__)
  36 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
  37 #  define _RET_NONNULL    , returns_nonnull
  38 #endif
  39 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
  40 #  define _CONSTRUCTOR(x) constructor(x)
  41 #  define _DESTRUCTOR(x)  destructor(x)
  42 #  define _ALLOC_SIZE(x)  alloc_size(x)
  43 #endif
  44 #if __GNUC__ >= 7
  45 #  define _FALLTHROUGH __attribute__((fallthrough));
  46 #endif
  47 #endif
  48
  49 #ifdef __sun
  50 /* Solaris doesn't do constructor priorities due to linker restrictions */
  51 #undef _CONSTRUCTOR
  52 #undef _DESTRUCTOR
  53 #endif
  54
  55 /* fallback versions */
  56 #ifndef _RET_NONNULL
  57 # define _RET_NONNULL
  58 #endif
  59 #ifndef _CONSTRUCTOR
  60 # define _CONSTRUCTOR(x) constructor
  61 #endif
  62 #ifndef _DESTRUCTOR
  63 # define _DESTRUCTOR(x) destructor
  64 #endif
  65 #ifndef _ALLOC_SIZE
  66 # define _ALLOC_SIZE(x)
  67 #endif
  68 #ifndef _FALLTHROUGH
  69 #define _FALLTHROUGH
  70 #endif
  71
  72 /*
  73  * for warnings on macros, put in the macro content like this:
  74  *   #define MACRO BLA CPP_WARN("MACRO has been deprecated")
  75  */
  76 #define CPP_STR(X) #X
  77
  78 #if defined(__ICC)
  79 #define CPP_NOTICE(text) _Pragma(CPP_STR(message __FILE__ ": " text))
  80 #define CPP_WARN(text) CPP_NOTICE(text)
  81
  82 #elif (defined(__GNUC__)                                                       \
  83        && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))           \
  84         || (defined(__clang__)                                                 \
  85             && (__clang_major__ >= 4                                           \
  86                 || (__clang_major__ == 3 && __clang_minor__ >= 5)))
  87 #define CPP_WARN(text) _Pragma(CPP_STR(GCC warning text))
  88 #define CPP_NOTICE(text) _Pragma(CPP_STR(message text))
  89
  90 #else
  91 #define CPP_WARN(text)
  92 #define CPP_NOTICE(text)
  93 #endif
  94
  95 #ifdef __cplusplus
  96 }
  97 #endif
  98
  99 #endif /* _FRR_COMPILER_H */