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 /* function attributes, use like
  21  *   void prototype(void) __attribute__((_CONSTRUCTOR(100)));
  22  */
  23 #if defined(__clang__)
  24 #if __clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >= 5)
  25 #  define _RET_NONNULL    , returns_nonnull
  26 #endif
  27 #if __has_attribute(fallthrough)
  28 #  define _FALLTHROUGH __attribute__((fallthrough));
  29 #endif
  30 # define _CONSTRUCTOR(x)  constructor(x)
  31 #elif defined(__GNUC__)
  32 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
  33 #  define _RET_NONNULL    , returns_nonnull
  34 #endif
  35 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
  36 #  define _CONSTRUCTOR(x) constructor(x)
  37 #  define _DESTRUCTOR(x)  destructor(x)
  38 #  define _ALLOC_SIZE(x)  alloc_size(x)
  39 #endif
  40 #if __GNUC__ >= 7
  41 #  define _FALLTHROUGH __attribute__((fallthrough));
  42 #endif
  43 #endif
  44
  45 #ifdef __sun
  46 /* Solaris doesn't do constructor priorities due to linker restrictions */
  47 #undef _CONSTRUCTOR
  48 #undef _DESTRUCTOR
  49 #endif
  50
  51 /* fallback versions */
  52 #ifndef _RET_NONNULL
  53 # define _RET_NONNULL
  54 #endif
  55 #ifndef _CONSTRUCTOR
  56 # define _CONSTRUCTOR(x) constructor
  57 #endif
  58 #ifndef _DESTRUCTOR
  59 # define _DESTRUCTOR(x) destructor
  60 #endif
  61 #ifndef _ALLOC_SIZE
  62 # define _ALLOC_SIZE(x)
  63 #endif
  64 #ifndef _FALLTHROUGH
  65 #define _FALLTHROUGH
  66 #endif
  67
  68 /*
  69  * for warnings on macros, put in the macro content like this:
  70  *   #define MACRO BLA CPP_WARN("MACRO has been deprecated")
  71  */
  72 #define CPP_STR(X) #X
  73
  74 #if defined(__ICC)
  75 #define CPP_NOTICE(text) _Pragma(CPP_STR(message __FILE__ ": " text))
  76 #define CPP_WARN(text) CPP_NOTICE(text)
  77
  78 #elif (defined(__GNUC__)                                                       \
  79        && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)))           \
  80         || (defined(__clang__)                                                 \
  81             && (__clang_major__ >= 4                                           \
  82                 || (__clang_major__ == 3 && __clang_minor__ >= 5)))
  83 #define CPP_WARN(text) _Pragma(CPP_STR(GCC warning text))
  84 #define CPP_NOTICE(text) _Pragma(CPP_STR(message text))
  85
  86 #else
  87 #define CPP_WARN(text)
  88 #define CPP_NOTICE(text)
  89 #endif
  90
  91 #endif /* _FRR_COMPILER_H */