tests/tap/macros.h

   1 /*
   2  * Helpful macros for TAP header files.
   3  *
   4  * This is not, strictly speaking, related to TAP, but any TAP add-on is
   5  * probably going to need these macros, so define them in one place so that
   6  * everyone can pull them in.
   7  *
   8  * This file is part of C TAP Harness.  The current version plus supporting
   9  * documentation is at <https://www.eyrie.org/~eagle/software/c-tap-harness/>.
  10  *
  11  * Copyright 2008, 2012, 2013, 2015 Russ Allbery <eagle@eyrie.org>
  12  *
  13  * Permission is hereby granted, free of charge, to any person obtaining a
  14  * copy of this software and associated documentation files (the "Software"),
  15  * to deal in the Software without restriction, including without limitation
  16  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  17  * and/or sell copies of the Software, and to permit persons to whom the
  18  * Software is furnished to do so, subject to the following conditions:
  19  *
  20  * The above copyright notice and this permission notice shall be included in
  21  * all copies or substantial portions of the Software.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  24  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  25  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  26  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  27  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  28  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  29  * DEALINGS IN THE SOFTWARE.
  30  */
  31
  32 #ifndef TAP_MACROS_H
  33 #define TAP_MACROS_H 1
  34
  35 /*
  36  * __attribute__ is available in gcc 2.5 and later, but only with gcc 2.7
  37  * could you use the __format__ form of the attributes, which is what we use
  38  * (to avoid confusion with other macros), and only with gcc 2.96 can you use
  39  * the attribute __malloc__.  2.96 is very old, so don't bother trying to get
  40  * the other attributes to work with GCC versions between 2.7 and 2.96.
  41  */
  42 #ifndef __attribute__
  43 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
  44 #  define __attribute__(spec)   /* empty */
  45 # endif
  46 #endif
  47
  48 /*
  49  * We use __alloc_size__, but it was only available in fairly recent versions
  50  * of GCC.  Suppress warnings about the unknown attribute if GCC is too old.
  51  * We know that we're GCC at this point, so we can use the GCC variadic macro
  52  * extension, which will still work with versions of GCC too old to have C99
  53  * variadic macro support.
  54  */
  55 #if !defined(__attribute__) && !defined(__alloc_size__)
  56 # if defined(__GNUC__) && !defined(__clang__)
  57 #  if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 3)
  58 #   define __alloc_size__(spec, args...) /* empty */
  59 #  endif
  60 # endif
  61 #endif
  62
  63 /* Suppress __warn_unused_result__ if gcc is too old. */
  64 #if !defined(__attribute__) && !defined(__warn_unused_result__)
  65 # if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 4)
  66 #  define __warn_unused_result__ /* empty */
  67 # endif
  68 #endif
  69
  70 /*
  71  * LLVM and Clang pretend to be GCC but don't support all of the __attribute__
  72  * settings that GCC does.  For them, suppress warnings about unknown
  73  * attributes on declarations.  This unfortunately will affect the entire
  74  * compilation context, but there's no push and pop available.
  75  */
  76 #if !defined(__attribute__) && (defined(__llvm__) || defined(__clang__))
  77 # pragma GCC diagnostic ignored "-Wattributes"
  78 #endif
  79
  80 /* Used for unused parameters to silence gcc warnings. */
  81 #define UNUSED __attribute__((__unused__))
  82
  83 /*
  84  * BEGIN_DECLS is used at the beginning of declarations so that C++
  85  * compilers don't mangle their names.  END_DECLS is used at the end.
  86  */
  87 #undef BEGIN_DECLS
  88 #undef END_DECLS
  89 #ifdef __cplusplus
  90 # define BEGIN_DECLS    extern "C" {
  91 # define END_DECLS      }
  92 #else
  93 # define BEGIN_DECLS    /* empty */
  94 # define END_DECLS      /* empty */
  95 #endif
  96
  97 #endif /* TAP_MACROS_H */