2 * Helpful macros for TAP header files.
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.
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/>.
11 * Copyright 2008, 2012-2013, 2015, 2022 Russ Allbery <eagle@eyrie.org>
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:
20 * The above copyright notice and this permission notice shall be included in
21 * all copies or substantial portions of the Software.
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.
31 * SPDX-License-Identifier: MIT
35 #define TAP_MACROS_H 1
38 * __attribute__ is available in gcc 2.5 and later, but only with gcc 2.7
39 * could you use the __format__ form of the attributes, which is what we use
40 * (to avoid confusion with other macros), and only with gcc 2.96 can you use
41 * the attribute __malloc__. 2.96 is very old, so don't bother trying to get
42 * the other attributes to work with GCC versions between 2.7 and 2.96.
45 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
46 # define __attribute__(spec) /* empty */
51 * We use __alloc_size__, but it was only available in fairly recent versions
52 * of GCC. Suppress warnings about the unknown attribute if GCC is too old.
53 * We know that we're GCC at this point, so we can use the GCC variadic macro
54 * extension, which will still work with versions of GCC too old to have C99
55 * variadic macro support.
57 #if !defined(__attribute__) && !defined(__alloc_size__)
58 # if defined(__GNUC__) && !defined(__clang__)
59 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 3)
60 # define __alloc_size__(spec, args...) /* empty */
65 /* Suppress __warn_unused_result__ if gcc is too old. */
66 #if !defined(__attribute__) && !defined(__warn_unused_result__)
67 # if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 4)
68 # define __warn_unused_result__ /* empty */
73 * Suppress the argument to __malloc__ in Clang (not supported in at least
74 * version 13) and GCC versions prior to 11.
76 #if !defined(__attribute__) && !defined(__malloc__)
77 # if defined(__clang__) || __GNUC__ < 11
78 # define __malloc__(dalloc) __malloc__
83 * LLVM and Clang pretend to be GCC but don't support all of the __attribute__
84 * settings that GCC does. For them, suppress warnings about unknown
85 * attributes on declarations. This unfortunately will affect the entire
86 * compilation context, but there's no push and pop available.
88 #if !defined(__attribute__) && (defined(__llvm__) || defined(__clang__))
89 # pragma GCC diagnostic ignored "-Wattributes"
92 /* Used for unused parameters to silence gcc warnings. */
93 #define UNUSED __attribute__((__unused__))
96 * BEGIN_DECLS is used at the beginning of declarations so that C++
97 * compilers don't mangle their names. END_DECLS is used at the end.
102 # define BEGIN_DECLS extern "C" {
105 # define BEGIN_DECLS /* empty */
106 # define END_DECLS /* empty */
109 #endif /* TAP_MACROS_H */