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269b4861 | 1 | /* Copyright (C) 1991-1993,1995-2000,2001,2002 Free Software Foundation, Inc. |
2c6fe0bd | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
2c6fe0bd | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 8 | |
2c6fe0bd UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
28f540f4 RM |
18 | |
19 | #ifndef _FEATURES_H | |
28f540f4 RM |
20 | #define _FEATURES_H 1 |
21 | ||
22 | /* These are defined by the user (or the compiler) | |
23 | to specify the desired environment: | |
24 | ||
d38cd08c | 25 | __STRICT_ANSI__ ISO Standard C. |
ec751a23 | 26 | _ISOC99_SOURCE Extensions to ISO C89 from ISO C99. |
28f540f4 | 27 | _POSIX_SOURCE IEEE Std 1003.1. |
6d52618b | 28 | _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2; |
118bad87 UD |
29 | if >=199309L, add IEEE Std 1003.1b-1993; |
30 | if >=199506L, add IEEE Std 1003.1c-1995 | |
a5a0310d | 31 | _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if |
925e31d9 UD |
32 | Single Unix conformance is wanted, to 600 for the |
33 | upcoming sixth revision. | |
2c6fe0bd | 34 | _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions. |
dfd2257a UD |
35 | _LARGEFILE_SOURCE Some more functions for correct standard I/O. |
36 | _LARGEFILE64_SOURCE Additional functionality from LFS for large files. | |
37 | _FILE_OFFSET_BITS=N Select default filesystem interface. | |
d38cd08c UD |
38 | _BSD_SOURCE ISO C, POSIX, and 4.3BSD things. |
39 | _SVID_SOURCE ISO C, POSIX, and SVID things. | |
28f540f4 | 40 | _GNU_SOURCE All of the above, plus GNU extensions. |
ec4b0518 UD |
41 | _REENTRANT Select additionally reentrant object. |
42 | _THREAD_SAFE Same as _REENTRANT, often used by other systems. | |
28f540f4 RM |
43 | |
44 | The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__. | |
77586df3 UD |
45 | If none of these are defined, the default is to have _SVID_SOURCE, |
46 | _BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to | |
47 | 199506L. If more than one of these are defined, they accumulate. | |
28f540f4 | 48 | For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE |
d38cd08c | 49 | together give you ISO C, 1003.1, and 1003.2, but nothing else. |
28f540f4 RM |
50 | |
51 | These are defined by this file and are used by the | |
52 | header files to decide what to declare or define: | |
53 | ||
ec751a23 | 54 | __USE_ISOC99 Define ISO C99 things. |
28f540f4 RM |
55 | __USE_POSIX Define IEEE Std 1003.1 things. |
56 | __USE_POSIX2 Define IEEE Std 1003.2 things. | |
4a582094 UD |
57 | __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things. |
58 | __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things. | |
2c6fe0bd UD |
59 | __USE_XOPEN Define XPG things. |
60 | __USE_XOPEN_EXTENDED Define X/Open Unix things. | |
a5a0310d | 61 | __USE_UNIX98 Define Single Unix V2 things. |
925e31d9 UD |
62 | __USE_XOPEN2K Define XPG6 things. |
63 | __USE_LARGEFILE Define correct standard I/O things. | |
dfd2257a UD |
64 | __USE_LARGEFILE64 Define LFS things with separate names. |
65 | __USE_FILE_OFFSET64 Define 64bit interface as default. | |
28f540f4 RM |
66 | __USE_BSD Define 4.3BSD things. |
67 | __USE_SVID Define SVID things. | |
68 | __USE_MISC Define things common to BSD and System V Unix. | |
69 | __USE_GNU Define GNU extensions. | |
aa910907 | 70 | __USE_REENTRANT Define reentrant/thread-safe *_r functions. |
28f540f4 RM |
71 | __FAVOR_BSD Favor 4.3BSD things in cases of conflict. |
72 | ||
d38cd08c UD |
73 | The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are |
74 | defined by this file unconditionally. `__GNU_LIBRARY__' is provided | |
75 | only for compatibility. All new code should use the other symbols | |
76 | to test for features. | |
28f540f4 | 77 | |
28f540f4 RM |
78 | All macros listed above as possibly being defined by this file are |
79 | explicitly undefined if they are not explicitly defined. | |
80 | Feature-test macros that are not defined by the user or compiler | |
81 | but are implied by the other feature-test macros defined (or by the | |
82 | lack of any definitions) are defined by the file. */ | |
83 | ||
84 | ||
85 | /* Undefine everything, so we get a clean slate. */ | |
ec751a23 | 86 | #undef __USE_ISOC99 |
28f540f4 RM |
87 | #undef __USE_POSIX |
88 | #undef __USE_POSIX2 | |
6d52618b | 89 | #undef __USE_POSIX199309 |
4a582094 | 90 | #undef __USE_POSIX199506 |
2c6fe0bd UD |
91 | #undef __USE_XOPEN |
92 | #undef __USE_XOPEN_EXTENDED | |
dfd2257a | 93 | #undef __USE_UNIX98 |
24d6fe58 | 94 | #undef __USE_XOPEN2K |
dfd2257a UD |
95 | #undef __USE_LARGEFILE |
96 | #undef __USE_LARGEFILE64 | |
97 | #undef __USE_FILE_OFFSET64 | |
28f540f4 RM |
98 | #undef __USE_BSD |
99 | #undef __USE_SVID | |
100 | #undef __USE_MISC | |
101 | #undef __USE_GNU | |
aa910907 | 102 | #undef __USE_REENTRANT |
28f540f4 | 103 | #undef __FAVOR_BSD |
a1470b6f | 104 | #undef __KERNEL_STRICT_NAMES |
28f540f4 | 105 | |
a1470b6f | 106 | /* Suppress kernel-name space pollution unless user expressedly asks |
2c6fe0bd | 107 | for it. */ |
a1470b6f RM |
108 | #ifndef _LOOSE_KERNEL_NAMES |
109 | # define __KERNEL_STRICT_NAMES | |
110 | #endif | |
28f540f4 | 111 | |
d38cd08c | 112 | /* Always use ISO C things. */ |
28f540f4 RM |
113 | #define __USE_ANSI 1 |
114 | ||
115 | ||
116 | /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */ | |
d38cd08c UD |
117 | #if defined _BSD_SOURCE && \ |
118 | !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \ | |
df4ef2ab | 119 | defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \ |
d38cd08c | 120 | defined _GNU_SOURCE || defined _SVID_SOURCE) |
2c6fe0bd | 121 | # define __FAVOR_BSD 1 |
28f540f4 RM |
122 | #endif |
123 | ||
59dd8641 RM |
124 | /* If _GNU_SOURCE was defined by the user, turn on all the other features. */ |
125 | #ifdef _GNU_SOURCE | |
ec751a23 UD |
126 | # undef _ISOC99_SOURCE |
127 | # define _ISOC99_SOURCE 1 | |
5107cf1d UD |
128 | # undef _POSIX_SOURCE |
129 | # define _POSIX_SOURCE 1 | |
130 | # undef _POSIX_C_SOURCE | |
dd7d45e8 | 131 | # define _POSIX_C_SOURCE 199506L |
5107cf1d | 132 | # undef _XOPEN_SOURCE |
219aa9e9 | 133 | # define _XOPEN_SOURCE 600 |
5107cf1d UD |
134 | # undef _XOPEN_SOURCE_EXTENDED |
135 | # define _XOPEN_SOURCE_EXTENDED 1 | |
dfd2257a UD |
136 | # undef _LARGEFILE64_SOURCE |
137 | # define _LARGEFILE64_SOURCE 1 | |
5107cf1d UD |
138 | # undef _BSD_SOURCE |
139 | # define _BSD_SOURCE 1 | |
140 | # undef _SVID_SOURCE | |
141 | # define _SVID_SOURCE 1 | |
59dd8641 | 142 | #endif |
28f540f4 RM |
143 | |
144 | /* If nothing (other than _GNU_SOURCE) is defined, | |
145 | define _BSD_SOURCE and _SVID_SOURCE. */ | |
ec751a23 | 146 | #if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \ |
2f6d1f1b UD |
147 | !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \ |
148 | !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \ | |
149 | !defined _BSD_SOURCE && !defined _SVID_SOURCE) | |
5107cf1d UD |
150 | # define _BSD_SOURCE 1 |
151 | # define _SVID_SOURCE 1 | |
28f540f4 RM |
152 | #endif |
153 | ||
ec751a23 UD |
154 | /* This is to enable the ISO C99 extension. Also recognize the old macro |
155 | which was used prior to the standard acceptance. This macro will | |
156 | eventually go away and the features enabled by default once the ISO C99 | |
157 | standard is widely adopted. */ | |
47a81620 UD |
158 | #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \ |
159 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) | |
ec751a23 | 160 | # define __USE_ISOC99 1 |
2f6d1f1b UD |
161 | #endif |
162 | ||
6d52618b UD |
163 | /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2 |
164 | (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */ | |
d38cd08c UD |
165 | #if (!defined __STRICT_ANSI__ && !defined _POSIX_SOURCE && \ |
166 | !defined _POSIX_C_SOURCE) | |
5107cf1d | 167 | # define _POSIX_SOURCE 1 |
925e31d9 | 168 | # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500 |
5107cf1d UD |
169 | # define _POSIX_C_SOURCE 2 |
170 | # else | |
dd7d45e8 | 171 | # define _POSIX_C_SOURCE 199506L |
5107cf1d | 172 | # endif |
28f540f4 RM |
173 | #endif |
174 | ||
d38cd08c | 175 | #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE |
5107cf1d | 176 | # define __USE_POSIX 1 |
28f540f4 RM |
177 | #endif |
178 | ||
d38cd08c | 179 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE |
5107cf1d | 180 | # define __USE_POSIX2 1 |
28f540f4 RM |
181 | #endif |
182 | ||
9756dfe1 UD |
183 | #if (_POSIX_C_SOURCE - 0) >= 199309L |
184 | # define __USE_POSIX199309 1 | |
6d52618b UD |
185 | #endif |
186 | ||
4a582094 UD |
187 | #if (_POSIX_C_SOURCE - 0) >= 199506L |
188 | # define __USE_POSIX199506 1 | |
189 | #endif | |
190 | ||
2c6fe0bd | 191 | #ifdef _XOPEN_SOURCE |
5107cf1d | 192 | # define __USE_XOPEN 1 |
219aa9e9 | 193 | # if (_XOPEN_SOURCE - 0) >= 500 |
5107cf1d | 194 | # define __USE_XOPEN_EXTENDED 1 |
a5a0310d | 195 | # define __USE_UNIX98 1 |
dfd2257a UD |
196 | # undef _LARGEFILE_SOURCE |
197 | # define _LARGEFILE_SOURCE 1 | |
925e31d9 | 198 | # if (_XOPEN_SOURCE - 0) >= 600 |
219aa9e9 | 199 | # define __USE_XOPEN2K 1 |
91bc38d0 UD |
200 | # undef __USE_ISOC99 |
201 | # define __USE_ISOC99 1 | |
219aa9e9 | 202 | # endif |
a5a0310d UD |
203 | # else |
204 | # ifdef _XOPEN_SOURCE_EXTENDED | |
205 | # define __USE_XOPEN_EXTENDED 1 | |
206 | # endif | |
5107cf1d | 207 | # endif |
2c6fe0bd UD |
208 | #endif |
209 | ||
dfd2257a UD |
210 | #ifdef _LARGEFILE_SOURCE |
211 | # define __USE_LARGEFILE 1 | |
212 | #endif | |
213 | ||
214 | #ifdef _LARGEFILE64_SOURCE | |
215 | # define __USE_LARGEFILE64 1 | |
216 | #endif | |
217 | ||
218 | #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 | |
219 | # define __USE_FILE_OFFSET64 1 | |
220 | #endif | |
221 | ||
d38cd08c | 222 | #if defined _BSD_SOURCE || defined _SVID_SOURCE |
5107cf1d | 223 | # define __USE_MISC 1 |
28f540f4 RM |
224 | #endif |
225 | ||
226 | #ifdef _BSD_SOURCE | |
5107cf1d | 227 | # define __USE_BSD 1 |
28f540f4 RM |
228 | #endif |
229 | ||
230 | #ifdef _SVID_SOURCE | |
5107cf1d | 231 | # define __USE_SVID 1 |
28f540f4 RM |
232 | #endif |
233 | ||
234 | #ifdef _GNU_SOURCE | |
5107cf1d | 235 | # define __USE_GNU 1 |
28f540f4 RM |
236 | #endif |
237 | ||
d38cd08c | 238 | #if defined _REENTRANT || defined _THREAD_SAFE |
5107cf1d | 239 | # define __USE_REENTRANT 1 |
aa910907 RM |
240 | #endif |
241 | ||
d705269e UD |
242 | /* We do support the IEC 559 math functionality, real and complex. */ |
243 | #define __STDC_IEC_559__ 1 | |
244 | #define __STDC_IEC_559_COMPLEX__ 1 | |
28f540f4 | 245 | |
95589177 | 246 | /* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */ |
d3d99893 | 247 | #define __STDC_ISO_10646__ 200009L |
91bc38d0 | 248 | |
ba1ffaa1 UD |
249 | /* This macro indicates that the installed library is the GNU C Library. |
250 | For historic reasons the value now is 6 and this will stay from now | |
251 | on. The use of this variable is deprecated. Use __GLIBC__ and | |
252 | __GLIBC_MINOR__ now (see below) when you want to test for a specific | |
253 | GNU C library version and use the values in <gnu/lib-names.h> to get | |
254 | the sonames of the shared libraries. */ | |
255 | #undef __GNU_LIBRARY__ | |
256 | #define __GNU_LIBRARY__ 6 | |
257 | ||
258 | /* Major and minor version number of the GNU C library package. Use | |
259 | these macros to test for features in specific releases. */ | |
260 | #define __GLIBC__ 2 | |
269b4861 | 261 | #define __GLIBC_MINOR__ 3 |
28f540f4 | 262 | |
4360eafd UD |
263 | /* Convenience macros to test the versions of glibc and gcc. |
264 | Use them like this: | |
265 | #if __GNUC_PREREQ (2,8) | |
266 | ... code requiring gcc 2.8 or later ... | |
267 | #endif | |
268 | Note - they won't work for gcc1 or glibc1, since the _MINOR macros | |
269 | were not defined then. */ | |
f042f18f UD |
270 | #if defined __GNUC__ && defined __GNUC_MINOR__ |
271 | # define __GNUC_PREREQ(maj, min) \ | |
272 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) | |
273 | #else | |
274 | # define __GNUC_PREREQ(maj, min) 0 | |
275 | #endif | |
276 | ||
277 | #define __GLIBC_PREREQ(maj, min) \ | |
278 | ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) | |
4360eafd | 279 | |
5224e27c AJ |
280 | /* Decide whether a compiler supports the long long datatypes. */ |
281 | #if defined __GNUC__ \ | |
282 | || (defined __PGI && defined __i386__ ) \ | |
283 | || (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \ | |
12518320 | 284 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) |
5224e27c AJ |
285 | # define __GLIBC_HAVE_LONG_LONG 1 |
286 | #endif | |
287 | ||
28f540f4 | 288 | /* This is here only because every header file already includes this one. */ |
edf5b2d7 | 289 | #ifndef __ASSEMBLER__ |
95589177 UD |
290 | # ifndef _SYS_CDEFS_H |
291 | # include <sys/cdefs.h> | |
292 | # endif | |
01cad722 UD |
293 | |
294 | /* If we don't have __REDIRECT, prototypes will be missing if | |
295 | __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */ | |
296 | # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT | |
4152ed15 UD |
297 | # define __USE_LARGEFILE 1 |
298 | # define __USE_LARGEFILE64 1 | |
01cad722 UD |
299 | # endif |
300 | ||
eedbbe58 UD |
301 | #endif /* !ASSEMBLER */ |
302 | ||
303 | /* Decide whether we can define 'extern inline' functions in headers. */ | |
07c416ed AJ |
304 | #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ |
305 | && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ | |
eedbbe58 | 306 | # define __USE_EXTERN_INLINES 1 |
edf5b2d7 | 307 | #endif |
28f540f4 | 308 | |
28f540f4 | 309 | |
ce460d04 RM |
310 | /* This is here only because every header file already includes this one. |
311 | Get the definitions of all the appropriate `__stub_FUNCTION' symbols. | |
312 | <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub | |
313 | that will always return failure (and set errno to ENOSYS). */ | |
314 | #include <gnu/stubs.h> | |
28f540f4 | 315 | |
28f540f4 | 316 | |
6ed0492f | 317 | #endif /* features.h */ |