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