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2b778ceb | 1 | /* Copyright (C) 1991-2021 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. | |
858045ad JM |
36 | __STDC_WANT_IEC_60559_EXT__ |
37 | ISO C2X interfaces defined only in Annex F. | |
c0307377 | 38 | |
28f540f4 | 39 | _POSIX_SOURCE IEEE Std 1003.1. |
6d52618b | 40 | _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2; |
118bad87 | 41 | if >=199309L, add IEEE Std 1003.1b-1993; |
7a80496f UD |
42 | if >=199506L, add IEEE Std 1003.1c-1995; |
43 | if >=200112L, all of IEEE 1003.1-2004 | |
3e6b0a28 | 44 | if >=200809L, all of IEEE 1003.1-2008 |
a5a0310d | 45 | _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if |
925e31d9 | 46 | Single Unix conformance is wanted, to 600 for the |
3e6b0a28 | 47 | sixth revision, to 700 for the seventh revision. |
2c6fe0bd | 48 | _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions. |
dfd2257a UD |
49 | _LARGEFILE_SOURCE Some more functions for correct standard I/O. |
50 | _LARGEFILE64_SOURCE Additional functionality from LFS for large files. | |
51 | _FILE_OFFSET_BITS=N Select default filesystem interface. | |
0b8f25bb | 52 | _ATFILE_SOURCE Additional *at interfaces. |
5d98a7da L |
53 | _DYNAMIC_STACK_SIZE_SOURCE Select correct (but non compile-time constant) |
54 | MINSIGSTKSZ, SIGSTKSZ and PTHREAD_STACK_MIN. | |
28f540f4 | 55 | _GNU_SOURCE All of the above, plus GNU extensions. |
c688b419 JM |
56 | _DEFAULT_SOURCE The default set of features (taking precedence over |
57 | __STRICT_ANSI__). | |
c0307377 ZW |
58 | |
59 | _FORTIFY_SOURCE Add security hardening to many library functions. | |
60 | Set to 1 or 2; 2 performs stricter checks than 1. | |
61 | ||
62 | _REENTRANT, _THREAD_SAFE | |
63 | Obsolete; equivalent to _POSIX_C_SOURCE=199506L. | |
28f540f4 | 64 | |
c688b419 JM |
65 | The `-ansi' switch to the GNU C compiler, and standards conformance |
66 | options such as `-std=c99', define __STRICT_ANSI__. If none of | |
67 | these are defined, or if _DEFAULT_SOURCE is defined, the default is | |
c941736c JM |
68 | to have _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to |
69 | 200809L, as well as enabling miscellaneous functions from BSD and | |
70 | SVID. If more than one of these are defined, they accumulate. For | |
71 | example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE together | |
72 | give you ISO C, 1003.1, and 1003.2, but nothing else. | |
28f540f4 RM |
73 | |
74 | These are defined by this file and are used by the | |
75 | header files to decide what to declare or define: | |
76 | ||
48789000 JM |
77 | __GLIBC_USE (F) Define things from feature set F. This is defined |
78 | to 1 or 0; the subsequent macros are either defined | |
79 | or undefined, and those tests should be moved to | |
80 | __GLIBC_USE. | |
d7809905 | 81 | __USE_ISOC11 Define ISO C11 things. |
ec751a23 | 82 | __USE_ISOC99 Define ISO C99 things. |
087722b8 | 83 | __USE_ISOC95 Define ISO C90 AMD1 (C95) things. |
d6c064e9 | 84 | __USE_ISOCXX11 Define ISO C++11 things. |
28f540f4 RM |
85 | __USE_POSIX Define IEEE Std 1003.1 things. |
86 | __USE_POSIX2 Define IEEE Std 1003.2 things. | |
4a582094 UD |
87 | __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things. |
88 | __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things. | |
2c6fe0bd UD |
89 | __USE_XOPEN Define XPG things. |
90 | __USE_XOPEN_EXTENDED Define X/Open Unix things. | |
a5a0310d | 91 | __USE_UNIX98 Define Single Unix V2 things. |
925e31d9 | 92 | __USE_XOPEN2K Define XPG6 things. |
f095bb72 | 93 | __USE_XOPEN2KXSI Define XPG6 XSI things. |
81489b2e | 94 | __USE_XOPEN2K8 Define XPG7 things. |
f095bb72 | 95 | __USE_XOPEN2K8XSI Define XPG7 XSI things. |
925e31d9 | 96 | __USE_LARGEFILE Define correct standard I/O things. |
dfd2257a UD |
97 | __USE_LARGEFILE64 Define LFS things with separate names. |
98 | __USE_FILE_OFFSET64 Define 64bit interface as default. | |
498afc54 | 99 | __USE_MISC Define things from 4.3BSD or System V Unix. |
0b8f25bb | 100 | __USE_ATFILE Define *at interfaces and AT_* constants for them. |
5d98a7da L |
101 | __USE_DYNAMIC_STACK_SIZE Define correct (but non compile-time constant) |
102 | MINSIGSTKSZ, SIGSTKSZ and PTHREAD_STACK_MIN. | |
28f540f4 | 103 | __USE_GNU Define GNU extensions. |
b5cc329c | 104 | __USE_FORTIFY_LEVEL Additional security measures used, according to level. |
28f540f4 | 105 | |
d38cd08c UD |
106 | The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are |
107 | defined by this file unconditionally. `__GNU_LIBRARY__' is provided | |
108 | only for compatibility. All new code should use the other symbols | |
109 | to test for features. | |
28f540f4 | 110 | |
28f540f4 RM |
111 | All macros listed above as possibly being defined by this file are |
112 | explicitly undefined if they are not explicitly defined. | |
113 | Feature-test macros that are not defined by the user or compiler | |
114 | but are implied by the other feature-test macros defined (or by the | |
48789000 JM |
115 | lack of any definitions) are defined by the file. |
116 | ||
117 | ISO C feature test macros depend on the definition of the macro | |
118 | when an affected header is included, not when the first system | |
119 | header is included, and so they are handled in | |
120 | <bits/libc-header-start.h>, which does not have a multiple include | |
121 | guard. Feature test macros that can be handled from the first | |
122 | system header included are handled here. */ | |
28f540f4 RM |
123 | |
124 | ||
125 | /* Undefine everything, so we get a clean slate. */ | |
d7809905 | 126 | #undef __USE_ISOC11 |
ec751a23 | 127 | #undef __USE_ISOC99 |
087722b8 | 128 | #undef __USE_ISOC95 |
8fd8ff3b | 129 | #undef __USE_ISOCXX11 |
28f540f4 RM |
130 | #undef __USE_POSIX |
131 | #undef __USE_POSIX2 | |
6d52618b | 132 | #undef __USE_POSIX199309 |
4a582094 | 133 | #undef __USE_POSIX199506 |
2c6fe0bd UD |
134 | #undef __USE_XOPEN |
135 | #undef __USE_XOPEN_EXTENDED | |
dfd2257a | 136 | #undef __USE_UNIX98 |
24d6fe58 | 137 | #undef __USE_XOPEN2K |
f095bb72 | 138 | #undef __USE_XOPEN2KXSI |
3e6b0a28 | 139 | #undef __USE_XOPEN2K8 |
f095bb72 | 140 | #undef __USE_XOPEN2K8XSI |
dfd2257a UD |
141 | #undef __USE_LARGEFILE |
142 | #undef __USE_LARGEFILE64 | |
143 | #undef __USE_FILE_OFFSET64 | |
28f540f4 | 144 | #undef __USE_MISC |
0b8f25bb | 145 | #undef __USE_ATFILE |
5d98a7da | 146 | #undef __USE_DYNAMIC_STACK_SIZE |
28f540f4 | 147 | #undef __USE_GNU |
b5cc329c | 148 | #undef __USE_FORTIFY_LEVEL |
a1470b6f | 149 | #undef __KERNEL_STRICT_NAMES |
777d75fb | 150 | #undef __GLIBC_USE_ISOC2X |
7caa5054 | 151 | #undef __GLIBC_USE_DEPRECATED_GETS |
03992356 | 152 | #undef __GLIBC_USE_DEPRECATED_SCANF |
28f540f4 | 153 | |
a1470b6f | 154 | /* Suppress kernel-name space pollution unless user expressedly asks |
2c6fe0bd | 155 | for it. */ |
a1470b6f RM |
156 | #ifndef _LOOSE_KERNEL_NAMES |
157 | # define __KERNEL_STRICT_NAMES | |
158 | #endif | |
28f540f4 | 159 | |
cab4d74b ZW |
160 | /* Convenience macro to test the version of gcc. |
161 | Use like this: | |
b5cc329c UD |
162 | #if __GNUC_PREREQ (2,8) |
163 | ... code requiring gcc 2.8 or later ... | |
164 | #endif | |
cab4d74b ZW |
165 | Note: only works for GCC 2.0 and later, because __GNUC_MINOR__ was |
166 | added in 2.0. */ | |
b5cc329c UD |
167 | #if defined __GNUC__ && defined __GNUC_MINOR__ |
168 | # define __GNUC_PREREQ(maj, min) \ | |
169 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) | |
170 | #else | |
171 | # define __GNUC_PREREQ(maj, min) 0 | |
172 | #endif | |
173 | ||
cab4d74b ZW |
174 | /* Similarly for clang. Features added to GCC after version 4.2 may |
175 | or may not also be available in clang, and clang's definitions of | |
176 | __GNUC(_MINOR)__ are fixed at 4 and 2 respectively. Not all such | |
177 | features can be queried via __has_extension/__has_feature. */ | |
178 | #if defined __clang_major__ && defined __clang_minor__ | |
179 | # define __glibc_clang_prereq(maj, min) \ | |
180 | ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min)) | |
181 | #else | |
182 | # define __glibc_clang_prereq(maj, min) 0 | |
183 | #endif | |
184 | ||
48789000 JM |
185 | /* Whether to use feature set F. */ |
186 | #define __GLIBC_USE(F) __GLIBC_USE_ ## F | |
187 | ||
c941736c | 188 | /* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for |
ade40b10 CD |
189 | _DEFAULT_SOURCE. If _DEFAULT_SOURCE is present we do not |
190 | issue a warning; the expectation is that the source is being | |
191 | transitioned to use the new macro. */ | |
192 | #if (defined _BSD_SOURCE || defined _SVID_SOURCE) \ | |
193 | && !defined _DEFAULT_SOURCE | |
c941736c JM |
194 | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" |
195 | # undef _DEFAULT_SOURCE | |
196 | # define _DEFAULT_SOURCE 1 | |
197 | #endif | |
28f540f4 | 198 | |
59dd8641 RM |
199 | /* If _GNU_SOURCE was defined by the user, turn on all the other features. */ |
200 | #ifdef _GNU_SOURCE | |
e531ede5 UD |
201 | # undef _ISOC95_SOURCE |
202 | # define _ISOC95_SOURCE 1 | |
ec751a23 UD |
203 | # undef _ISOC99_SOURCE |
204 | # define _ISOC99_SOURCE 1 | |
d7809905 UD |
205 | # undef _ISOC11_SOURCE |
206 | # define _ISOC11_SOURCE 1 | |
777d75fb JM |
207 | # undef _ISOC2X_SOURCE |
208 | # define _ISOC2X_SOURCE 1 | |
5107cf1d UD |
209 | # undef _POSIX_SOURCE |
210 | # define _POSIX_SOURCE 1 | |
211 | # undef _POSIX_C_SOURCE | |
3e6b0a28 | 212 | # define _POSIX_C_SOURCE 200809L |
5107cf1d | 213 | # undef _XOPEN_SOURCE |
3e6b0a28 | 214 | # define _XOPEN_SOURCE 700 |
5107cf1d UD |
215 | # undef _XOPEN_SOURCE_EXTENDED |
216 | # define _XOPEN_SOURCE_EXTENDED 1 | |
dfd2257a UD |
217 | # undef _LARGEFILE64_SOURCE |
218 | # define _LARGEFILE64_SOURCE 1 | |
c688b419 JM |
219 | # undef _DEFAULT_SOURCE |
220 | # define _DEFAULT_SOURCE 1 | |
0b8f25bb RM |
221 | # undef _ATFILE_SOURCE |
222 | # define _ATFILE_SOURCE 1 | |
5d98a7da L |
223 | # undef _DYNAMIC_STACK_SIZE_SOURCE |
224 | # define _DYNAMIC_STACK_SIZE_SOURCE 1 | |
59dd8641 | 225 | #endif |
28f540f4 | 226 | |
c688b419 | 227 | /* If nothing (other than _GNU_SOURCE and _DEFAULT_SOURCE) is defined, |
498afc54 | 228 | define _DEFAULT_SOURCE. */ |
c688b419 JM |
229 | #if (defined _DEFAULT_SOURCE \ |
230 | || (!defined __STRICT_ANSI__ \ | |
862b4502 | 231 | && !defined _ISOC99_SOURCE && !defined _ISOC11_SOURCE \ |
777d75fb | 232 | && !defined _ISOC2X_SOURCE \ |
c688b419 | 233 | && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE \ |
498afc54 | 234 | && !defined _XOPEN_SOURCE)) |
c688b419 JM |
235 | # undef _DEFAULT_SOURCE |
236 | # define _DEFAULT_SOURCE 1 | |
28f540f4 RM |
237 | #endif |
238 | ||
777d75fb JM |
239 | /* This is to enable the ISO C2X extension. */ |
240 | #if (defined _ISOC2X_SOURCE \ | |
241 | || (defined __STDC_VERSION__ && __STDC_VERSION__ > 201710L)) | |
242 | # define __GLIBC_USE_ISOC2X 1 | |
243 | #else | |
244 | # define __GLIBC_USE_ISOC2X 0 | |
245 | #endif | |
246 | ||
d7809905 | 247 | /* This is to enable the ISO C11 extension. */ |
777d75fb | 248 | #if (defined _ISOC11_SOURCE || defined _ISOC2X_SOURCE \ |
d7809905 | 249 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L)) |
c0e87cc0 UD |
250 | # define __USE_ISOC11 1 |
251 | #endif | |
d7809905 UD |
252 | |
253 | /* This is to enable the ISO C99 extension. */ | |
777d75fb JM |
254 | #if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \ |
255 | || defined _ISOC2X_SOURCE \ | |
47a81620 | 256 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) |
ec751a23 | 257 | # define __USE_ISOC99 1 |
2f6d1f1b UD |
258 | #endif |
259 | ||
087722b8 | 260 | /* This is to enable the ISO C90 Amendment 1:1995 extension. */ |
777d75fb JM |
261 | #if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \ |
262 | || defined _ISOC2X_SOURCE \ | |
087722b8 UD |
263 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L)) |
264 | # define __USE_ISOC95 1 | |
265 | #endif | |
266 | ||
d6c064e9 JW |
267 | #ifdef __cplusplus |
268 | /* This is to enable compatibility for ISO C++17. */ | |
269 | # if __cplusplus >= 201703L | |
270 | # define __USE_ISOC11 1 | |
271 | # endif | |
8fd8ff3b | 272 | /* This is to enable compatibility for ISO C++11. |
d6c064e9 JW |
273 | Check the temporary macro for now, too. */ |
274 | # if __cplusplus >= 201103L || defined __GXX_EXPERIMENTAL_CXX0X__ | |
275 | # define __USE_ISOCXX11 1 | |
276 | # define __USE_ISOC99 1 | |
277 | # endif | |
8fd8ff3b UD |
278 | #endif |
279 | ||
c688b419 JM |
280 | /* If none of the ANSI/POSIX macros are defined, or if _DEFAULT_SOURCE |
281 | is defined, use POSIX.1-2008 (or another version depending on | |
282 | _XOPEN_SOURCE). */ | |
283 | #ifdef _DEFAULT_SOURCE | |
284 | # if !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE | |
285 | # define __USE_POSIX_IMPLICITLY 1 | |
286 | # endif | |
287 | # undef _POSIX_SOURCE | |
288 | # define _POSIX_SOURCE 1 | |
289 | # undef _POSIX_C_SOURCE | |
290 | # define _POSIX_C_SOURCE 200809L | |
291 | #endif | |
c0307377 | 292 | |
f248238c JM |
293 | #if ((!defined __STRICT_ANSI__ \ |
294 | || (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500)) \ | |
295 | && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE) | |
5107cf1d | 296 | # define _POSIX_SOURCE 1 |
925e31d9 | 297 | # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500 |
5107cf1d | 298 | # define _POSIX_C_SOURCE 2 |
1676aaef | 299 | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600 |
a334319f | 300 | # define _POSIX_C_SOURCE 199506L |
3e6b0a28 | 301 | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700 |
1676aaef | 302 | # define _POSIX_C_SOURCE 200112L |
3e6b0a28 UD |
303 | # else |
304 | # define _POSIX_C_SOURCE 200809L | |
5107cf1d | 305 | # endif |
2e6d6bac | 306 | # define __USE_POSIX_IMPLICITLY 1 |
28f540f4 RM |
307 | #endif |
308 | ||
c0307377 ZW |
309 | /* Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be |
310 | defined in all multithreaded code. GNU libc has not required this | |
311 | for many years. We now treat them as compatibility synonyms for | |
312 | _POSIX_C_SOURCE=199506L, which is the earliest level of POSIX with | |
313 | comprehensive support for multithreaded code. Using them never | |
314 | lowers the selected level of POSIX conformance, only raises it. */ | |
315 | #if ((!defined _POSIX_C_SOURCE || (_POSIX_C_SOURCE - 0) < 199506L) \ | |
316 | && (defined _REENTRANT || defined _THREAD_SAFE)) | |
317 | # define _POSIX_SOURCE 1 | |
318 | # undef _POSIX_C_SOURCE | |
319 | # define _POSIX_C_SOURCE 199506L | |
320 | #endif | |
321 | ||
f248238c JM |
322 | #if (defined _POSIX_SOURCE \ |
323 | || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1) \ | |
324 | || defined _XOPEN_SOURCE) | |
5107cf1d | 325 | # define __USE_POSIX 1 |
28f540f4 RM |
326 | #endif |
327 | ||
d38cd08c | 328 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE |
5107cf1d | 329 | # define __USE_POSIX2 1 |
28f540f4 RM |
330 | #endif |
331 | ||
f248238c | 332 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199309L |
9756dfe1 | 333 | # define __USE_POSIX199309 1 |
6d52618b UD |
334 | #endif |
335 | ||
f248238c | 336 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L |
4a582094 UD |
337 | # define __USE_POSIX199506 1 |
338 | #endif | |
339 | ||
f248238c | 340 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L |
23ae6451 | 341 | # define __USE_XOPEN2K 1 |
e531ede5 UD |
342 | # undef __USE_ISOC95 |
343 | # define __USE_ISOC95 1 | |
c163ee23 UD |
344 | # undef __USE_ISOC99 |
345 | # define __USE_ISOC99 1 | |
23ae6451 UD |
346 | #endif |
347 | ||
f248238c | 348 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200809L |
3e6b0a28 UD |
349 | # define __USE_XOPEN2K8 1 |
350 | # undef _ATFILE_SOURCE | |
351 | # define _ATFILE_SOURCE 1 | |
352 | #endif | |
353 | ||
2c6fe0bd | 354 | #ifdef _XOPEN_SOURCE |
5107cf1d | 355 | # define __USE_XOPEN 1 |
219aa9e9 | 356 | # if (_XOPEN_SOURCE - 0) >= 500 |
5107cf1d | 357 | # define __USE_XOPEN_EXTENDED 1 |
a5a0310d | 358 | # define __USE_UNIX98 1 |
dfd2257a UD |
359 | # undef _LARGEFILE_SOURCE |
360 | # define _LARGEFILE_SOURCE 1 | |
925e31d9 | 361 | # if (_XOPEN_SOURCE - 0) >= 600 |
3e6b0a28 UD |
362 | # if (_XOPEN_SOURCE - 0) >= 700 |
363 | # define __USE_XOPEN2K8 1 | |
f095bb72 | 364 | # define __USE_XOPEN2K8XSI 1 |
3e6b0a28 | 365 | # endif |
219aa9e9 | 366 | # define __USE_XOPEN2K 1 |
f095bb72 | 367 | # define __USE_XOPEN2KXSI 1 |
e531ede5 UD |
368 | # undef __USE_ISOC95 |
369 | # define __USE_ISOC95 1 | |
91bc38d0 UD |
370 | # undef __USE_ISOC99 |
371 | # define __USE_ISOC99 1 | |
219aa9e9 | 372 | # endif |
a5a0310d UD |
373 | # else |
374 | # ifdef _XOPEN_SOURCE_EXTENDED | |
375 | # define __USE_XOPEN_EXTENDED 1 | |
376 | # endif | |
5107cf1d | 377 | # endif |
2c6fe0bd UD |
378 | #endif |
379 | ||
dfd2257a UD |
380 | #ifdef _LARGEFILE_SOURCE |
381 | # define __USE_LARGEFILE 1 | |
382 | #endif | |
383 | ||
384 | #ifdef _LARGEFILE64_SOURCE | |
385 | # define __USE_LARGEFILE64 1 | |
386 | #endif | |
387 | ||
388 | #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 | |
389 | # define __USE_FILE_OFFSET64 1 | |
390 | #endif | |
391 | ||
47f24c21 AZ |
392 | #include <features-time64.h> |
393 | ||
498afc54 | 394 | #if defined _DEFAULT_SOURCE |
5107cf1d | 395 | # define __USE_MISC 1 |
28f540f4 RM |
396 | #endif |
397 | ||
0b8f25bb RM |
398 | #ifdef _ATFILE_SOURCE |
399 | # define __USE_ATFILE 1 | |
400 | #endif | |
401 | ||
5d98a7da L |
402 | #ifdef _DYNAMIC_STACK_SIZE_SOURCE |
403 | # define __USE_DYNAMIC_STACK_SIZE 1 | |
6c57d320 L |
404 | #endif |
405 | ||
28f540f4 | 406 | #ifdef _GNU_SOURCE |
5107cf1d | 407 | # define __USE_GNU 1 |
28f540f4 RM |
408 | #endif |
409 | ||
05c2c961 RMG |
410 | #if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 |
411 | # if !defined __OPTIMIZE__ || __OPTIMIZE__ <= 0 | |
412 | # warning _FORTIFY_SOURCE requires compiling with optimization (-O) | |
413 | # elif !__GNUC_PREREQ (4, 1) | |
414 | # warning _FORTIFY_SOURCE requires GCC 4.1 or later | |
c43c5796 SP |
415 | # elif _FORTIFY_SOURCE > 2 && __glibc_clang_prereq (9, 0) |
416 | # if _FORTIFY_SOURCE > 3 | |
417 | # warning _FORTIFY_SOURCE > 3 is treated like 3 on this platform | |
418 | # endif | |
419 | # define __USE_FORTIFY_LEVEL 3 | |
05c2c961 | 420 | # elif _FORTIFY_SOURCE > 1 |
2a08b6e8 SP |
421 | # if _FORTIFY_SOURCE > 2 |
422 | # warning _FORTIFY_SOURCE > 2 is treated like 2 on this platform | |
423 | # endif | |
a334319f | 424 | # define __USE_FORTIFY_LEVEL 2 |
faa26ad4 RM |
425 | # else |
426 | # define __USE_FORTIFY_LEVEL 1 | |
b5cc329c | 427 | # endif |
05c2c961 RMG |
428 | #endif |
429 | #ifndef __USE_FORTIFY_LEVEL | |
faa26ad4 | 430 | # define __USE_FORTIFY_LEVEL 0 |
b5cc329c UD |
431 | #endif |
432 | ||
7caa5054 ZW |
433 | /* The function 'gets' existed in C89, but is impossible to use |
434 | safely. It has been removed from ISO C11 and ISO C++14. Note: for | |
435 | compatibility with various implementations of <cstdio>, this test | |
436 | must consider only the value of __cplusplus when compiling C++. */ | |
437 | #if defined __cplusplus ? __cplusplus >= 201402L : defined __USE_ISOC11 | |
438 | # define __GLIBC_USE_DEPRECATED_GETS 0 | |
439 | #else | |
440 | # define __GLIBC_USE_DEPRECATED_GETS 1 | |
441 | #endif | |
442 | ||
03992356 ZW |
443 | /* GNU formerly extended the scanf functions with modified format |
444 | specifiers %as, %aS, and %a[...] that allocate a buffer for the | |
445 | input using malloc. This extension conflicts with ISO C99, which | |
446 | defines %a as a standalone format specifier that reads a floating- | |
447 | point number; moreover, POSIX.1-2008 provides the same feature | |
448 | using the modifier letter 'm' instead (%ms, %mS, %m[...]). | |
449 | ||
450 | We now follow C99 unless GNU extensions are active and the compiler | |
451 | is specifically in C89 or C++98 mode (strict or not). For | |
452 | instance, with GCC, -std=gnu11 will have C99-compliant scanf with | |
453 | or without -D_GNU_SOURCE, but -std=c89 -D_GNU_SOURCE will have the | |
454 | old extension. */ | |
34a5a146 JM |
455 | #if (defined __USE_GNU \ |
456 | && (defined __cplusplus \ | |
457 | ? (__cplusplus < 201103L && !defined __GXX_EXPERIMENTAL_CXX0X__) \ | |
458 | : (!defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L))) | |
03992356 ZW |
459 | # define __GLIBC_USE_DEPRECATED_SCANF 1 |
460 | #else | |
461 | # define __GLIBC_USE_DEPRECATED_SCANF 0 | |
462 | #endif | |
463 | ||
ff3b3d82 JM |
464 | /* Get definitions of __STDC_* predefined macros, if the compiler has |
465 | not preincluded this header automatically. */ | |
466 | #include <stdc-predef.h> | |
91bc38d0 | 467 | |
ba1ffaa1 UD |
468 | /* This macro indicates that the installed library is the GNU C Library. |
469 | For historic reasons the value now is 6 and this will stay from now | |
470 | on. The use of this variable is deprecated. Use __GLIBC__ and | |
471 | __GLIBC_MINOR__ now (see below) when you want to test for a specific | |
472 | GNU C library version and use the values in <gnu/lib-names.h> to get | |
473 | the sonames of the shared libraries. */ | |
474 | #undef __GNU_LIBRARY__ | |
475 | #define __GNU_LIBRARY__ 6 | |
476 | ||
477 | /* Major and minor version number of the GNU C library package. Use | |
478 | these macros to test for features in specific releases. */ | |
479 | #define __GLIBC__ 2 | |
9826b03b | 480 | #define __GLIBC_MINOR__ 33 |
28f540f4 | 481 | |
f042f18f UD |
482 | #define __GLIBC_PREREQ(maj, min) \ |
483 | ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) | |
4360eafd | 484 | |
28f540f4 | 485 | /* This is here only because every header file already includes this one. */ |
edf5b2d7 | 486 | #ifndef __ASSEMBLER__ |
95589177 UD |
487 | # ifndef _SYS_CDEFS_H |
488 | # include <sys/cdefs.h> | |
489 | # endif | |
01cad722 UD |
490 | |
491 | /* If we don't have __REDIRECT, prototypes will be missing if | |
492 | __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */ | |
493 | # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT | |
4152ed15 UD |
494 | # define __USE_LARGEFILE 1 |
495 | # define __USE_LARGEFILE64 1 | |
01cad722 UD |
496 | # endif |
497 | ||
eedbbe58 UD |
498 | #endif /* !ASSEMBLER */ |
499 | ||
500 | /* Decide whether we can define 'extern inline' functions in headers. */ | |
07c416ed | 501 | #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ |
de1c3ebb UD |
502 | && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \ |
503 | && defined __extern_inline | |
eedbbe58 | 504 | # define __USE_EXTERN_INLINES 1 |
edf5b2d7 | 505 | #endif |
28f540f4 | 506 | |
28f540f4 | 507 | |
ce460d04 RM |
508 | /* This is here only because every header file already includes this one. |
509 | Get the definitions of all the appropriate `__stub_FUNCTION' symbols. | |
510 | <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub | |
511 | that will always return failure (and set errno to ENOSYS). */ | |
512 | #include <gnu/stubs.h> | |
28f540f4 | 513 | |
28f540f4 | 514 | |
6ed0492f | 515 | #endif /* features.h */ |