1 /* ANSI and traditional C compatability macros
2 Copyright (C) 1991-2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
19 /* ANSI and traditional C compatibility macros
21 ANSI C is assumed if __STDC__ is #defined.
23 Macro ANSI C definition Traditional C definition
24 ----- ---- - ---------- ----------- - ----------
27 volatile not defined `'
30 For ease of writing code which uses GCC extensions but needs to be
31 portable to other compilers, we provide the GCC_VERSION macro that
32 simplifies testing __GNUC__ and __GNUC_MINOR__ together, and various
33 wrappers around __attribute__. Also, __extension__ will be #defined
34 to nothing if it doesn't work. See below. */
43 /* Every source file includes this file,
44 so they will all get the switch for lint. */
47 /* Using MACRO(x,y) in cpp #if conditionals does not work with some
48 older preprocessors. Thus we can't define something like this:
50 #define HAVE_GCC_VERSION(MAJOR, MINOR) \
51 (__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
53 and then test "#if HAVE_GCC_VERSION(2,7)".
55 So instead we use the macro below and test it against specific values. */
57 /* This macro simplifies testing whether we are using gcc, and if it
58 is of a particular minimum version. (Both major & minor numbers are
59 significant.) This macro will evaluate to 0 if we are not using
62 #define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
63 #endif /* GCC_VERSION */
65 #if defined (__STDC__) || defined(__cplusplus) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
66 /* All known AIX compilers implement these things (but don't always
67 define __STDC__). The RISC/OS MIPS compiler defines these things
68 in SVR4 mode, but does not define __STDC__. */
69 /* eraxxon@alumni.rice.edu: The Compaq C++ compiler, unlike many other
70 C++ compilers, does not define __STDC__, though it acts as if this
71 was so. (Verified versions: 5.7, 6.2, 6.3, 6.5) */
79 /* inline requires special treatment; it's in C99, and GCC >=2.7 supports
80 it too, but it's not in C89. */
82 #if __STDC_VERSION__ >= 199901L || defined(__cplusplus) || (defined(__SUNPRO_C) && defined(__C99FEATURES__))
85 # if GCC_VERSION >= 2007
86 # define inline __inline__ /* __inline__ prevents -pedantic warnings */
88 # define inline /* nothing */
92 #else /* Not ANSI C. */
96 /* some systems define these in header files for non-ansi mode */
108 /* Define macros for some gcc attributes. This permits us to use the
109 macros freely, and know that they will come into play for the
110 version of gcc in which they are supported. */
112 #if (GCC_VERSION < 2007)
113 # define __attribute__(x)
116 /* Attribute __malloc__ on functions was valid as of gcc 2.96. */
117 #ifndef ATTRIBUTE_MALLOC
118 # if (GCC_VERSION >= 2096)
119 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
121 # define ATTRIBUTE_MALLOC
122 # endif /* GNUC >= 2.96 */
123 #endif /* ATTRIBUTE_MALLOC */
125 /* Attributes on labels were valid as of gcc 2.93 and g++ 4.5. For
126 g++ an attribute on a label must be followed by a semicolon. */
127 #ifndef ATTRIBUTE_UNUSED_LABEL
129 # if GCC_VERSION >= 2093
130 # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
132 # define ATTRIBUTE_UNUSED_LABEL
135 # if GCC_VERSION >= 4005
136 # define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED ;
138 # define ATTRIBUTE_UNUSED_LABEL
143 /* Similarly to ARG_UNUSED below. Prior to GCC 3.4, the C++ frontend
144 couldn't parse attributes placed after the identifier name, and now
145 the entire compiler is built with C++. */
146 #ifndef ATTRIBUTE_UNUSED
147 #if GCC_VERSION >= 3004
148 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
150 #define ATTRIBUTE_UNUSED
152 #endif /* ATTRIBUTE_UNUSED */
154 /* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the
156 #if ! defined(__cplusplus) || (GCC_VERSION >= 3004)
157 # define ARG_UNUSED(NAME) NAME ATTRIBUTE_UNUSED
158 #else /* !__cplusplus || GNUC >= 3.4 */
159 # define ARG_UNUSED(NAME) NAME
160 #endif /* !__cplusplus || GNUC >= 3.4 */
162 #ifndef ATTRIBUTE_NORETURN
163 #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
164 #endif /* ATTRIBUTE_NORETURN */
166 /* Attribute `nonnull' was valid as of gcc 3.3. */
167 #ifndef ATTRIBUTE_NONNULL
168 # if (GCC_VERSION >= 3003)
169 # define ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
171 # define ATTRIBUTE_NONNULL(m)
172 # endif /* GNUC >= 3.3 */
173 #endif /* ATTRIBUTE_NONNULL */
175 /* Attribute `returns_nonnull' was valid as of gcc 4.9. */
176 #ifndef ATTRIBUTE_RETURNS_NONNULL
177 # if (GCC_VERSION >= 4009)
178 # define ATTRIBUTE_RETURNS_NONNULL __attribute__ ((__returns_nonnull__))
180 # define ATTRIBUTE_RETURNS_NONNULL
181 # endif /* GNUC >= 4.9 */
182 #endif /* ATTRIBUTE_RETURNS_NONNULL */
184 /* Attribute `pure' was valid as of gcc 3.0. */
185 #ifndef ATTRIBUTE_PURE
186 # if (GCC_VERSION >= 3000)
187 # define ATTRIBUTE_PURE __attribute__ ((__pure__))
189 # define ATTRIBUTE_PURE
190 # endif /* GNUC >= 3.0 */
191 #endif /* ATTRIBUTE_PURE */
193 /* Use ATTRIBUTE_PRINTF when the format specifier must not be NULL.
194 This was the case for the `printf' format attribute by itself
195 before GCC 3.3, but as of 3.3 we need to add the `nonnull'
196 attribute to retain this behavior. */
197 #ifndef ATTRIBUTE_PRINTF
198 #define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n))) ATTRIBUTE_NONNULL(m)
199 #define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
200 #define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
201 #define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
202 #define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
203 #define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
204 #endif /* ATTRIBUTE_PRINTF */
206 /* Use ATTRIBUTE_FPTR_PRINTF when the format attribute is to be set on
207 a function pointer. Format attributes were allowed on function
208 pointers as of gcc 3.1. */
209 #ifndef ATTRIBUTE_FPTR_PRINTF
210 # if (GCC_VERSION >= 3001)
211 # define ATTRIBUTE_FPTR_PRINTF(m, n) ATTRIBUTE_PRINTF(m, n)
213 # define ATTRIBUTE_FPTR_PRINTF(m, n)
214 # endif /* GNUC >= 3.1 */
215 # define ATTRIBUTE_FPTR_PRINTF_1 ATTRIBUTE_FPTR_PRINTF(1, 2)
216 # define ATTRIBUTE_FPTR_PRINTF_2 ATTRIBUTE_FPTR_PRINTF(2, 3)
217 # define ATTRIBUTE_FPTR_PRINTF_3 ATTRIBUTE_FPTR_PRINTF(3, 4)
218 # define ATTRIBUTE_FPTR_PRINTF_4 ATTRIBUTE_FPTR_PRINTF(4, 5)
219 # define ATTRIBUTE_FPTR_PRINTF_5 ATTRIBUTE_FPTR_PRINTF(5, 6)
220 #endif /* ATTRIBUTE_FPTR_PRINTF */
222 /* Use ATTRIBUTE_NULL_PRINTF when the format specifier may be NULL. A
223 NULL format specifier was allowed as of gcc 3.3. */
224 #ifndef ATTRIBUTE_NULL_PRINTF
225 # if (GCC_VERSION >= 3003)
226 # define ATTRIBUTE_NULL_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
228 # define ATTRIBUTE_NULL_PRINTF(m, n)
229 # endif /* GNUC >= 3.3 */
230 # define ATTRIBUTE_NULL_PRINTF_1 ATTRIBUTE_NULL_PRINTF(1, 2)
231 # define ATTRIBUTE_NULL_PRINTF_2 ATTRIBUTE_NULL_PRINTF(2, 3)
232 # define ATTRIBUTE_NULL_PRINTF_3 ATTRIBUTE_NULL_PRINTF(3, 4)
233 # define ATTRIBUTE_NULL_PRINTF_4 ATTRIBUTE_NULL_PRINTF(4, 5)
234 # define ATTRIBUTE_NULL_PRINTF_5 ATTRIBUTE_NULL_PRINTF(5, 6)
235 #endif /* ATTRIBUTE_NULL_PRINTF */
237 /* Attribute `sentinel' was valid as of gcc 3.5. */
238 #ifndef ATTRIBUTE_SENTINEL
239 # if (GCC_VERSION >= 3005)
240 # define ATTRIBUTE_SENTINEL __attribute__ ((__sentinel__))
242 # define ATTRIBUTE_SENTINEL
243 # endif /* GNUC >= 3.5 */
244 #endif /* ATTRIBUTE_SENTINEL */
247 #ifndef ATTRIBUTE_ALIGNED_ALIGNOF
248 # if (GCC_VERSION >= 3000)
249 # define ATTRIBUTE_ALIGNED_ALIGNOF(m) __attribute__ ((__aligned__ (__alignof__ (m))))
251 # define ATTRIBUTE_ALIGNED_ALIGNOF(m)
252 # endif /* GNUC >= 3.0 */
253 #endif /* ATTRIBUTE_ALIGNED_ALIGNOF */
255 /* Useful for structures whose layout must much some binary specification
256 regardless of the alignment and padding qualities of the compiler. */
257 #ifndef ATTRIBUTE_PACKED
258 # define ATTRIBUTE_PACKED __attribute__ ((packed))
261 /* Attribute `hot' and `cold' was valid as of gcc 4.3. */
262 #ifndef ATTRIBUTE_COLD
263 # if (GCC_VERSION >= 4003)
264 # define ATTRIBUTE_COLD __attribute__ ((__cold__))
266 # define ATTRIBUTE_COLD
267 # endif /* GNUC >= 4.3 */
268 #endif /* ATTRIBUTE_COLD */
269 #ifndef ATTRIBUTE_HOT
270 # if (GCC_VERSION >= 4003)
271 # define ATTRIBUTE_HOT __attribute__ ((__hot__))
273 # define ATTRIBUTE_HOT
274 # endif /* GNUC >= 4.3 */
275 #endif /* ATTRIBUTE_HOT */
277 /* We use __extension__ in some places to suppress -pedantic warnings
278 about GCC extensions. This feature didn't work properly before
280 #if GCC_VERSION < 2008
281 #define __extension__
284 /* This is used to declare a const variable which should be visible
285 outside of the current compilation unit. Use it as
286 EXPORTED_CONST int i = 1;
287 This is because the semantics of const are different in C and C++.
288 "extern const" is permitted in C but it looks strange, and gcc
289 warns about it when -Wc++-compat is not used. */
291 #define EXPORTED_CONST extern const
293 #define EXPORTED_CONST const
296 /* Be conservative and only use enum bitfields with C++ or GCC.
297 FIXME: provide a complete autoconf test for buggy enum bitfields. */
300 #define ENUM_BITFIELD(TYPE) enum TYPE
301 #elif (GCC_VERSION > 2000)
302 #define ENUM_BITFIELD(TYPE) __extension__ enum TYPE
304 #define ENUM_BITFIELD(TYPE) unsigned int
311 #endif /* ansidecl.h */
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