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04277e02 | 1 | /* Copyright (C) 1991-2019 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 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
28f540f4 RM |
17 | |
18 | #ifndef _FEATURES_H | |
28f540f4 RM |
19 | #define _FEATURES_H 1 |
20 | ||
21 | /* These are defined by the user (or the compiler) | |
22 | to specify the desired environment: | |
23 | ||
d38cd08c | 24 | __STRICT_ANSI__ ISO Standard C. |
ec751a23 | 25 | _ISOC99_SOURCE Extensions to ISO C89 from ISO C99. |
d7809905 | 26 | _ISOC11_SOURCE Extensions to ISO C99 from ISO C11. |
777d75fb | 27 | _ISOC2X_SOURCE Extensions to ISO C99 from ISO C2X. |
c0307377 ZW |
28 | __STDC_WANT_LIB_EXT2__ |
29 | Extensions to ISO C99 from TR 27431-2:2010. | |
30 | __STDC_WANT_IEC_60559_BFP_EXT__ | |
31 | Extensions to ISO C11 from TS 18661-1:2014. | |
32 | __STDC_WANT_IEC_60559_FUNCS_EXT__ | |
33 | Extensions to ISO C11 from TS 18661-4:2015. | |
4fc12f0e PM |
34 | __STDC_WANT_IEC_60559_TYPES_EXT__ |
35 | Extensions to ISO C11 from TS 18661-3:2015. | |
c0307377 | 36 | |
28f540f4 | 37 | _POSIX_SOURCE IEEE Std 1003.1. |
6d52618b | 38 | _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2; |
118bad87 | 39 | if >=199309L, add IEEE Std 1003.1b-1993; |
7a80496f UD |
40 | if >=199506L, add IEEE Std 1003.1c-1995; |
41 | if >=200112L, all of IEEE 1003.1-2004 | |
3e6b0a28 | 42 | if >=200809L, all of IEEE 1003.1-2008 |
a5a0310d | 43 | _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if |
925e31d9 | 44 | Single Unix conformance is wanted, to 600 for the |
3e6b0a28 | 45 | sixth revision, to 700 for the seventh revision. |
2c6fe0bd | 46 | _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions. |
dfd2257a UD |
47 | _LARGEFILE_SOURCE Some more functions for correct standard I/O. |
48 | _LARGEFILE64_SOURCE Additional functionality from LFS for large files. | |
49 | _FILE_OFFSET_BITS=N Select default filesystem interface. | |
0b8f25bb | 50 | _ATFILE_SOURCE Additional *at interfaces. |
28f540f4 | 51 | _GNU_SOURCE All of the above, plus GNU extensions. |
c688b419 JM |
52 | _DEFAULT_SOURCE The default set of features (taking precedence over |
53 | __STRICT_ANSI__). | |
c0307377 ZW |
54 | |
55 | _FORTIFY_SOURCE Add security hardening to many library functions. | |
56 | Set to 1 or 2; 2 performs stricter checks than 1. | |
57 | ||
58 | _REENTRANT, _THREAD_SAFE | |
59 | Obsolete; equivalent to _POSIX_C_SOURCE=199506L. | |
28f540f4 | 60 | |
c688b419 JM |
61 | The `-ansi' switch to the GNU C compiler, and standards conformance |
62 | options such as `-std=c99', define __STRICT_ANSI__. If none of | |
63 | these are defined, or if _DEFAULT_SOURCE is defined, the default is | |
c941736c JM |
64 | to have _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to |
65 | 200809L, as well as enabling miscellaneous functions from BSD and | |
66 | SVID. If more than one of these are defined, they accumulate. For | |
67 | example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE together | |
68 | give you ISO C, 1003.1, and 1003.2, but nothing else. | |
28f540f4 RM |
69 | |
70 | These are defined by this file and are used by the | |
71 | header files to decide what to declare or define: | |
72 | ||
48789000 JM |
73 | __GLIBC_USE (F) Define things from feature set F. This is defined |
74 | to 1 or 0; the subsequent macros are either defined | |
75 | or undefined, and those tests should be moved to | |
76 | __GLIBC_USE. | |
d7809905 | 77 | __USE_ISOC11 Define ISO C11 things. |
ec751a23 | 78 | __USE_ISOC99 Define ISO C99 things. |
087722b8 | 79 | __USE_ISOC95 Define ISO C90 AMD1 (C95) things. |
d6c064e9 | 80 | __USE_ISOCXX11 Define ISO C++11 things. |
28f540f4 RM |
81 | __USE_POSIX Define IEEE Std 1003.1 things. |
82 | __USE_POSIX2 Define IEEE Std 1003.2 things. | |
4a582094 UD |
83 | __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things. |
84 | __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things. | |
2c6fe0bd UD |
85 | __USE_XOPEN Define XPG things. |
86 | __USE_XOPEN_EXTENDED Define X/Open Unix things. | |
a5a0310d | 87 | __USE_UNIX98 Define Single Unix V2 things. |
925e31d9 | 88 | __USE_XOPEN2K Define XPG6 things. |
f095bb72 | 89 | __USE_XOPEN2KXSI Define XPG6 XSI things. |
81489b2e | 90 | __USE_XOPEN2K8 Define XPG7 things. |
f095bb72 | 91 | __USE_XOPEN2K8XSI Define XPG7 XSI things. |
925e31d9 | 92 | __USE_LARGEFILE Define correct standard I/O things. |
dfd2257a UD |
93 | __USE_LARGEFILE64 Define LFS things with separate names. |
94 | __USE_FILE_OFFSET64 Define 64bit interface as default. | |
498afc54 | 95 | __USE_MISC Define things from 4.3BSD or System V Unix. |
0b8f25bb | 96 | __USE_ATFILE Define *at interfaces and AT_* constants for them. |
28f540f4 | 97 | __USE_GNU Define GNU extensions. |
b5cc329c | 98 | __USE_FORTIFY_LEVEL Additional security measures used, according to level. |
28f540f4 | 99 | |
d38cd08c UD |
100 | The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are |
101 | defined by this file unconditionally. `__GNU_LIBRARY__' is provided | |
102 | only for compatibility. All new code should use the other symbols | |
103 | to test for features. | |
28f540f4 | 104 | |
28f540f4 RM |
105 | All macros listed above as possibly being defined by this file are |
106 | explicitly undefined if they are not explicitly defined. | |
107 | Feature-test macros that are not defined by the user or compiler | |
108 | but are implied by the other feature-test macros defined (or by the | |
48789000 JM |
109 | lack of any definitions) are defined by the file. |
110 | ||
111 | ISO C feature test macros depend on the definition of the macro | |
112 | when an affected header is included, not when the first system | |
113 | header is included, and so they are handled in | |
114 | <bits/libc-header-start.h>, which does not have a multiple include | |
115 | guard. Feature test macros that can be handled from the first | |
116 | system header included are handled here. */ | |
28f540f4 RM |
117 | |
118 | ||
119 | /* Undefine everything, so we get a clean slate. */ | |
d7809905 | 120 | #undef __USE_ISOC11 |
ec751a23 | 121 | #undef __USE_ISOC99 |
087722b8 | 122 | #undef __USE_ISOC95 |
8fd8ff3b | 123 | #undef __USE_ISOCXX11 |
28f540f4 RM |
124 | #undef __USE_POSIX |
125 | #undef __USE_POSIX2 | |
6d52618b | 126 | #undef __USE_POSIX199309 |
4a582094 | 127 | #undef __USE_POSIX199506 |
2c6fe0bd UD |
128 | #undef __USE_XOPEN |
129 | #undef __USE_XOPEN_EXTENDED | |
dfd2257a | 130 | #undef __USE_UNIX98 |
24d6fe58 | 131 | #undef __USE_XOPEN2K |
f095bb72 | 132 | #undef __USE_XOPEN2KXSI |
3e6b0a28 | 133 | #undef __USE_XOPEN2K8 |
f095bb72 | 134 | #undef __USE_XOPEN2K8XSI |
dfd2257a UD |
135 | #undef __USE_LARGEFILE |
136 | #undef __USE_LARGEFILE64 | |
137 | #undef __USE_FILE_OFFSET64 | |
28f540f4 | 138 | #undef __USE_MISC |
0b8f25bb | 139 | #undef __USE_ATFILE |
28f540f4 | 140 | #undef __USE_GNU |
b5cc329c | 141 | #undef __USE_FORTIFY_LEVEL |
a1470b6f | 142 | #undef __KERNEL_STRICT_NAMES |
777d75fb | 143 | #undef __GLIBC_USE_ISOC2X |
7caa5054 | 144 | #undef __GLIBC_USE_DEPRECATED_GETS |
03992356 | 145 | #undef __GLIBC_USE_DEPRECATED_SCANF |
28f540f4 | 146 | |
a1470b6f | 147 | /* Suppress kernel-name space pollution unless user expressedly asks |
2c6fe0bd | 148 | for it. */ |
a1470b6f RM |
149 | #ifndef _LOOSE_KERNEL_NAMES |
150 | # define __KERNEL_STRICT_NAMES | |
151 | #endif | |
28f540f4 | 152 | |
cab4d74b ZW |
153 | /* Convenience macro to test the version of gcc. |
154 | Use like this: | |
b5cc329c UD |
155 | #if __GNUC_PREREQ (2,8) |
156 | ... code requiring gcc 2.8 or later ... | |
157 | #endif | |
cab4d74b ZW |
158 | Note: only works for GCC 2.0 and later, because __GNUC_MINOR__ was |
159 | added in 2.0. */ | |
b5cc329c UD |
160 | #if defined __GNUC__ && defined __GNUC_MINOR__ |
161 | # define __GNUC_PREREQ(maj, min) \ | |
162 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) | |
163 | #else | |
164 | # define __GNUC_PREREQ(maj, min) 0 | |
165 | #endif | |
166 | ||
cab4d74b ZW |
167 | /* Similarly for clang. Features added to GCC after version 4.2 may |
168 | or may not also be available in clang, and clang's definitions of | |
169 | __GNUC(_MINOR)__ are fixed at 4 and 2 respectively. Not all such | |
170 | features can be queried via __has_extension/__has_feature. */ | |
171 | #if defined __clang_major__ && defined __clang_minor__ | |
172 | # define __glibc_clang_prereq(maj, min) \ | |
173 | ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min)) | |
174 | #else | |
175 | # define __glibc_clang_prereq(maj, min) 0 | |
176 | #endif | |
177 | ||
48789000 JM |
178 | /* Whether to use feature set F. */ |
179 | #define __GLIBC_USE(F) __GLIBC_USE_ ## F | |
180 | ||
c941736c | 181 | /* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for |
ade40b10 CD |
182 | _DEFAULT_SOURCE. If _DEFAULT_SOURCE is present we do not |
183 | issue a warning; the expectation is that the source is being | |
184 | transitioned to use the new macro. */ | |
185 | #if (defined _BSD_SOURCE || defined _SVID_SOURCE) \ | |
186 | && !defined _DEFAULT_SOURCE | |
c941736c JM |
187 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" |
188 | # undef _DEFAULT_SOURCE | |
189 | # define _DEFAULT_SOURCE 1 | |
190 | #endif | |
28f540f4 | 191 | |
59dd8641 RM |
192 | /* If _GNU_SOURCE was defined by the user, turn on all the other features. */ |
193 | #ifdef _GNU_SOURCE | |
e531ede5 UD |
194 | # undef _ISOC95_SOURCE |
195 | # define _ISOC95_SOURCE 1 | |
ec751a23 UD |
196 | # undef _ISOC99_SOURCE |
197 | # define _ISOC99_SOURCE 1 | |
d7809905 UD |
198 | # undef _ISOC11_SOURCE |
199 | # define _ISOC11_SOURCE 1 | |
777d75fb JM |
200 | # undef _ISOC2X_SOURCE |
201 | # define _ISOC2X_SOURCE 1 | |
5107cf1d UD |
202 | # undef _POSIX_SOURCE |
203 | # define _POSIX_SOURCE 1 | |
204 | # undef _POSIX_C_SOURCE | |
3e6b0a28 | 205 | # define _POSIX_C_SOURCE 200809L |
5107cf1d | 206 | # undef _XOPEN_SOURCE |
3e6b0a28 | 207 | # define _XOPEN_SOURCE 700 |
5107cf1d UD |
208 | # undef _XOPEN_SOURCE_EXTENDED |
209 | # define _XOPEN_SOURCE_EXTENDED 1 | |
dfd2257a UD |
210 | # undef _LARGEFILE64_SOURCE |
211 | # define _LARGEFILE64_SOURCE 1 | |
c688b419 JM |
212 | # undef _DEFAULT_SOURCE |
213 | # define _DEFAULT_SOURCE 1 | |
0b8f25bb RM |
214 | # undef _ATFILE_SOURCE |
215 | # define _ATFILE_SOURCE 1 | |
59dd8641 | 216 | #endif |
28f540f4 | 217 | |
c688b419 | 218 | /* If nothing (other than _GNU_SOURCE and _DEFAULT_SOURCE) is defined, |
498afc54 | 219 | define _DEFAULT_SOURCE. */ |
c688b419 JM |
220 | #if (defined _DEFAULT_SOURCE \ |
221 | || (!defined __STRICT_ANSI__ \ | |
862b4502 | 222 | && !defined _ISOC99_SOURCE && !defined _ISOC11_SOURCE \ |
777d75fb | 223 | && !defined _ISOC2X_SOURCE \ |
c688b419 | 224 | && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE \ |
498afc54 | 225 | && !defined _XOPEN_SOURCE)) |
c688b419 JM |
226 | # undef _DEFAULT_SOURCE |
227 | # define _DEFAULT_SOURCE 1 | |
28f540f4 RM |
228 | #endif |
229 | ||
777d75fb JM |
230 | /* This is to enable the ISO C2X extension. */ |
231 | #if (defined _ISOC2X_SOURCE \ | |
232 | || (defined __STDC_VERSION__ && __STDC_VERSION__ > 201710L)) | |
233 | # define __GLIBC_USE_ISOC2X 1 | |
234 | #else | |
235 | # define __GLIBC_USE_ISOC2X 0 | |
236 | #endif | |
237 | ||
d7809905 | 238 | /* This is to enable the ISO C11 extension. */ |
777d75fb | 239 | #if (defined _ISOC11_SOURCE || defined _ISOC2X_SOURCE \ |
d7809905 | 240 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L)) |
c0e87cc0 UD |
241 | # define __USE_ISOC11 1 |
242 | #endif | |
d7809905 UD |
243 | |
244 | /* This is to enable the ISO C99 extension. */ | |
777d75fb JM |
245 | #if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \ |
246 | || defined _ISOC2X_SOURCE \ | |
47a81620 | 247 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) |
ec751a23 | 248 | # define __USE_ISOC99 1 |
2f6d1f1b UD |
249 | #endif |
250 | ||
087722b8 | 251 | /* This is to enable the ISO C90 Amendment 1:1995 extension. */ |
777d75fb JM |
252 | #if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \ |
253 | || defined _ISOC2X_SOURCE \ | |
087722b8 UD |
254 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L)) |
255 | # define __USE_ISOC95 1 | |
256 | #endif | |
257 | ||
d6c064e9 JW |
258 | #ifdef __cplusplus |
259 | /* This is to enable compatibility for ISO C++17. */ | |
260 | # if __cplusplus >= 201703L | |
261 | # define __USE_ISOC11 1 | |
262 | # endif | |
8fd8ff3b | 263 | /* This is to enable compatibility for ISO C++11. |
d6c064e9 JW |
264 | Check the temporary macro for now, too. */ |
265 | # if __cplusplus >= 201103L || defined __GXX_EXPERIMENTAL_CXX0X__ | |
266 | # define __USE_ISOCXX11 1 | |
267 | # define __USE_ISOC99 1 | |
268 | # endif | |
8fd8ff3b UD |
269 | #endif |
270 | ||
c688b419 JM |
271 | /* If none of the ANSI/POSIX macros are defined, or if _DEFAULT_SOURCE |
272 | is defined, use POSIX.1-2008 (or another version depending on | |
273 | _XOPEN_SOURCE). */ | |
274 | #ifdef _DEFAULT_SOURCE | |
275 | # if !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE | |
276 | # define __USE_POSIX_IMPLICITLY 1 | |
277 | # endif | |
278 | # undef _POSIX_SOURCE | |
279 | # define _POSIX_SOURCE 1 | |
280 | # undef _POSIX_C_SOURCE | |
281 | # define _POSIX_C_SOURCE 200809L | |
282 | #endif | |
c0307377 | 283 | |
f248238c JM |
284 | #if ((!defined __STRICT_ANSI__ \ |
285 | || (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500)) \ | |
286 | && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE) | |
5107cf1d | 287 | # define _POSIX_SOURCE 1 |
925e31d9 | 288 | # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500 |
5107cf1d | 289 | # define _POSIX_C_SOURCE 2 |
1676aaef | 290 | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600 |
a334319f | 291 | # define _POSIX_C_SOURCE 199506L |
3e6b0a28 | 292 | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700 |
1676aaef | 293 | # define _POSIX_C_SOURCE 200112L |
3e6b0a28 UD |
294 | # else |
295 | # define _POSIX_C_SOURCE 200809L | |
5107cf1d | 296 | # endif |
2e6d6bac | 297 | # define __USE_POSIX_IMPLICITLY 1 |
28f540f4 RM |
298 | #endif |
299 | ||
c0307377 ZW |
300 | /* Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be |
301 | defined in all multithreaded code. GNU libc has not required this | |
302 | for many years. We now treat them as compatibility synonyms for | |
303 | _POSIX_C_SOURCE=199506L, which is the earliest level of POSIX with | |
304 | comprehensive support for multithreaded code. Using them never | |
305 | lowers the selected level of POSIX conformance, only raises it. */ | |
306 | #if ((!defined _POSIX_C_SOURCE || (_POSIX_C_SOURCE - 0) < 199506L) \ | |
307 | && (defined _REENTRANT || defined _THREAD_SAFE)) | |
308 | # define _POSIX_SOURCE 1 | |
309 | # undef _POSIX_C_SOURCE | |
310 | # define _POSIX_C_SOURCE 199506L | |
311 | #endif | |
312 | ||
f248238c JM |
313 | #if (defined _POSIX_SOURCE \ |
314 | || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1) \ | |
315 | || defined _XOPEN_SOURCE) | |
5107cf1d | 316 | # define __USE_POSIX 1 |
28f540f4 RM |
317 | #endif |
318 | ||
d38cd08c | 319 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE |
5107cf1d | 320 | # define __USE_POSIX2 1 |
28f540f4 RM |
321 | #endif |
322 | ||
f248238c | 323 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199309L |
9756dfe1 | 324 | # define __USE_POSIX199309 1 |
6d52618b UD |
325 | #endif |
326 | ||
f248238c | 327 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L |
4a582094 UD |
328 | # define __USE_POSIX199506 1 |
329 | #endif | |
330 | ||
f248238c | 331 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L |
23ae6451 | 332 | # define __USE_XOPEN2K 1 |
e531ede5 UD |
333 | # undef __USE_ISOC95 |
334 | # define __USE_ISOC95 1 | |
c163ee23 UD |
335 | # undef __USE_ISOC99 |
336 | # define __USE_ISOC99 1 | |
23ae6451 UD |
337 | #endif |
338 | ||
f248238c | 339 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200809L |
3e6b0a28 UD |
340 | # define __USE_XOPEN2K8 1 |
341 | # undef _ATFILE_SOURCE | |
342 | # define _ATFILE_SOURCE 1 | |
343 | #endif | |
344 | ||
2c6fe0bd | 345 | #ifdef _XOPEN_SOURCE |
5107cf1d | 346 | # define __USE_XOPEN 1 |
219aa9e9 | 347 | # if (_XOPEN_SOURCE - 0) >= 500 |
5107cf1d | 348 | # define __USE_XOPEN_EXTENDED 1 |
a5a0310d | 349 | # define __USE_UNIX98 1 |
dfd2257a UD |
350 | # undef _LARGEFILE_SOURCE |
351 | # define _LARGEFILE_SOURCE 1 | |
925e31d9 | 352 | # if (_XOPEN_SOURCE - 0) >= 600 |
3e6b0a28 UD |
353 | # if (_XOPEN_SOURCE - 0) >= 700 |
354 | # define __USE_XOPEN2K8 1 | |
f095bb72 | 355 | # define __USE_XOPEN2K8XSI 1 |
3e6b0a28 | 356 | # endif |
219aa9e9 | 357 | # define __USE_XOPEN2K 1 |
f095bb72 | 358 | # define __USE_XOPEN2KXSI 1 |
e531ede5 UD |
359 | # undef __USE_ISOC95 |
360 | # define __USE_ISOC95 1 | |
91bc38d0 UD |
361 | # undef __USE_ISOC99 |
362 | # define __USE_ISOC99 1 | |
219aa9e9 | 363 | # endif |
a5a0310d UD |
364 | # else |
365 | # ifdef _XOPEN_SOURCE_EXTENDED | |
366 | # define __USE_XOPEN_EXTENDED 1 | |
367 | # endif | |
5107cf1d | 368 | # endif |
2c6fe0bd UD |
369 | #endif |
370 | ||
dfd2257a UD |
371 | #ifdef _LARGEFILE_SOURCE |
372 | # define __USE_LARGEFILE 1 | |
373 | #endif | |
374 | ||
375 | #ifdef _LARGEFILE64_SOURCE | |
376 | # define __USE_LARGEFILE64 1 | |
377 | #endif | |
378 | ||
379 | #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 | |
380 | # define __USE_FILE_OFFSET64 1 | |
381 | #endif | |
382 | ||
498afc54 | 383 | #if defined _DEFAULT_SOURCE |
5107cf1d | 384 | # define __USE_MISC 1 |
28f540f4 RM |
385 | #endif |
386 | ||
0b8f25bb RM |
387 | #ifdef _ATFILE_SOURCE |
388 | # define __USE_ATFILE 1 | |
389 | #endif | |
390 | ||
28f540f4 | 391 | #ifdef _GNU_SOURCE |
5107cf1d | 392 | # define __USE_GNU 1 |
28f540f4 RM |
393 | #endif |
394 | ||
05c2c961 RMG |
395 | #if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 |
396 | # if !defined __OPTIMIZE__ || __OPTIMIZE__ <= 0 | |
397 | # warning _FORTIFY_SOURCE requires compiling with optimization (-O) | |
398 | # elif !__GNUC_PREREQ (4, 1) | |
399 | # warning _FORTIFY_SOURCE requires GCC 4.1 or later | |
400 | # elif _FORTIFY_SOURCE > 1 | |
a334319f | 401 | # define __USE_FORTIFY_LEVEL 2 |
faa26ad4 RM |
402 | # else |
403 | # define __USE_FORTIFY_LEVEL 1 | |
b5cc329c | 404 | # endif |
05c2c961 RMG |
405 | #endif |
406 | #ifndef __USE_FORTIFY_LEVEL | |
faa26ad4 | 407 | # define __USE_FORTIFY_LEVEL 0 |
b5cc329c UD |
408 | #endif |
409 | ||
7caa5054 ZW |
410 | /* The function 'gets' existed in C89, but is impossible to use |
411 | safely. It has been removed from ISO C11 and ISO C++14. Note: for | |
412 | compatibility with various implementations of <cstdio>, this test | |
413 | must consider only the value of __cplusplus when compiling C++. */ | |
414 | #if defined __cplusplus ? __cplusplus >= 201402L : defined __USE_ISOC11 | |
415 | # define __GLIBC_USE_DEPRECATED_GETS 0 | |
416 | #else | |
417 | # define __GLIBC_USE_DEPRECATED_GETS 1 | |
418 | #endif | |
419 | ||
03992356 ZW |
420 | /* GNU formerly extended the scanf functions with modified format |
421 | specifiers %as, %aS, and %a[...] that allocate a buffer for the | |
422 | input using malloc. This extension conflicts with ISO C99, which | |
423 | defines %a as a standalone format specifier that reads a floating- | |
424 | point number; moreover, POSIX.1-2008 provides the same feature | |
425 | using the modifier letter 'm' instead (%ms, %mS, %m[...]). | |
426 | ||
427 | We now follow C99 unless GNU extensions are active and the compiler | |
428 | is specifically in C89 or C++98 mode (strict or not). For | |
429 | instance, with GCC, -std=gnu11 will have C99-compliant scanf with | |
430 | or without -D_GNU_SOURCE, but -std=c89 -D_GNU_SOURCE will have the | |
431 | old extension. */ | |
34a5a146 JM |
432 | #if (defined __USE_GNU \ |
433 | && (defined __cplusplus \ | |
434 | ? (__cplusplus < 201103L && !defined __GXX_EXPERIMENTAL_CXX0X__) \ | |
435 | : (!defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L))) | |
03992356 ZW |
436 | # define __GLIBC_USE_DEPRECATED_SCANF 1 |
437 | #else | |
438 | # define __GLIBC_USE_DEPRECATED_SCANF 0 | |
439 | #endif | |
440 | ||
ff3b3d82 JM |
441 | /* Get definitions of __STDC_* predefined macros, if the compiler has |
442 | not preincluded this header automatically. */ | |
443 | #include <stdc-predef.h> | |
91bc38d0 | 444 | |
ba1ffaa1 UD |
445 | /* This macro indicates that the installed library is the GNU C Library. |
446 | For historic reasons the value now is 6 and this will stay from now | |
447 | on. The use of this variable is deprecated. Use __GLIBC__ and | |
448 | __GLIBC_MINOR__ now (see below) when you want to test for a specific | |
449 | GNU C library version and use the values in <gnu/lib-names.h> to get | |
450 | the sonames of the shared libraries. */ | |
451 | #undef __GNU_LIBRARY__ | |
452 | #define __GNU_LIBRARY__ 6 | |
453 | ||
454 | /* Major and minor version number of the GNU C library package. Use | |
455 | these macros to test for features in specific releases. */ | |
456 | #define __GLIBC__ 2 | |
0a8262a1 | 457 | #define __GLIBC_MINOR__ 30 |
28f540f4 | 458 | |
f042f18f UD |
459 | #define __GLIBC_PREREQ(maj, min) \ |
460 | ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) | |
4360eafd | 461 | |
28f540f4 | 462 | /* This is here only because every header file already includes this one. */ |
edf5b2d7 | 463 | #ifndef __ASSEMBLER__ |
95589177 UD |
464 | # ifndef _SYS_CDEFS_H |
465 | # include <sys/cdefs.h> | |
466 | # endif | |
01cad722 UD |
467 | |
468 | /* If we don't have __REDIRECT, prototypes will be missing if | |
469 | __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */ | |
470 | # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT | |
4152ed15 UD |
471 | # define __USE_LARGEFILE 1 |
472 | # define __USE_LARGEFILE64 1 | |
01cad722 UD |
473 | # endif |
474 | ||
eedbbe58 UD |
475 | #endif /* !ASSEMBLER */ |
476 | ||
477 | /* Decide whether we can define 'extern inline' functions in headers. */ | |
07c416ed | 478 | #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ |
de1c3ebb UD |
479 | && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \ |
480 | && defined __extern_inline | |
eedbbe58 | 481 | # define __USE_EXTERN_INLINES 1 |
edf5b2d7 | 482 | #endif |
28f540f4 | 483 | |
28f540f4 | 484 | |
ce460d04 RM |
485 | /* This is here only because every header file already includes this one. |
486 | Get the definitions of all the appropriate `__stub_FUNCTION' symbols. | |
487 | <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub | |
488 | that will always return failure (and set errno to ENOSYS). */ | |
489 | #include <gnu/stubs.h> | |
28f540f4 | 490 | |
28f540f4 | 491 | |
6ed0492f | 492 | #endif /* features.h */ |