| ... | ... | @@ -1,515 +0,0 @@ |
| 1 | | /* Copyright (C) 1991-2021 Free Software Foundation, Inc. |
| 2 | | This file is part of the GNU C Library. |
| 3 | | |
| 4 | | The GNU C Library is free software; you can redistribute it and/or |
| 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. |
| 8 | | |
| 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 |
| 12 | | Lesser General Public License for more details. |
| 13 | | |
| 14 | | You should have received a copy of the GNU Lesser General Public |
| 15 | | License along with the GNU C Library; if not, see |
| 16 | | <https://www.gnu.org/licenses/>. */ |
| 17 | | |
| 18 | | #ifndef _FEATURES_H |
| 19 | | #define _FEATURES_H 1 |
| 20 | | |
| 21 | | /* These are defined by the user (or the compiler) |
| 22 | | to specify the desired environment: |
| 23 | | |
| 24 | | __STRICT_ANSI__ ISO Standard C. |
| 25 | | _ISOC99_SOURCE Extensions to ISO C89 from ISO C99. |
| 26 | | _ISOC11_SOURCE Extensions to ISO C99 from ISO C11. |
| 27 | | _ISOC2X_SOURCE Extensions to ISO C99 from ISO C2X. |
| 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. |
| 34 | | __STDC_WANT_IEC_60559_TYPES_EXT__ |
| 35 | | Extensions to ISO C11 from TS 18661-3:2015. |
| 36 | | __STDC_WANT_IEC_60559_EXT__ |
| 37 | | ISO C2X interfaces defined only in Annex F. |
| 38 | | |
| 39 | | _POSIX_SOURCE IEEE Std 1003.1. |
| 40 | | _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2; |
| 41 | | if >=199309L, add IEEE Std 1003.1b-1993; |
| 42 | | if >=199506L, add IEEE Std 1003.1c-1995; |
| 43 | | if >=200112L, all of IEEE 1003.1-2004 |
| 44 | | if >=200809L, all of IEEE 1003.1-2008 |
| 45 | | _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if |
| 46 | | Single Unix conformance is wanted, to 600 for the |
| 47 | | sixth revision, to 700 for the seventh revision. |
| 48 | | _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions. |
| 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. |
| 52 | | _ATFILE_SOURCE Additional *at interfaces. |
| 53 | | _DYNAMIC_STACK_SIZE_SOURCE Select correct (but non compile-time constant) |
| 54 | | MINSIGSTKSZ, SIGSTKSZ and PTHREAD_STACK_MIN. |
| 55 | | _GNU_SOURCE All of the above, plus GNU extensions. |
| 56 | | _DEFAULT_SOURCE The default set of features (taking precedence over |
| 57 | | __STRICT_ANSI__). |
| 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. |
| 64 | | |
| 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 |
| 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. |
| 73 | | |
| 74 | | These are defined by this file and are used by the |
| 75 | | header files to decide what to declare or define: |
| 76 | | |
| 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. |
| 81 | | __USE_ISOC11 Define ISO C11 things. |
| 82 | | __USE_ISOC99 Define ISO C99 things. |
| 83 | | __USE_ISOC95 Define ISO C90 AMD1 (C95) things. |
| 84 | | __USE_ISOCXX11 Define ISO C++11 things. |
| 85 | | __USE_POSIX Define IEEE Std 1003.1 things. |
| 86 | | __USE_POSIX2 Define IEEE Std 1003.2 things. |
| 87 | | __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things. |
| 88 | | __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things. |
| 89 | | __USE_XOPEN Define XPG things. |
| 90 | | __USE_XOPEN_EXTENDED Define X/Open Unix things. |
| 91 | | __USE_UNIX98 Define Single Unix V2 things. |
| 92 | | __USE_XOPEN2K Define XPG6 things. |
| 93 | | __USE_XOPEN2KXSI Define XPG6 XSI things. |
| 94 | | __USE_XOPEN2K8 Define XPG7 things. |
| 95 | | __USE_XOPEN2K8XSI Define XPG7 XSI things. |
| 96 | | __USE_LARGEFILE Define correct standard I/O things. |
| 97 | | __USE_LARGEFILE64 Define LFS things with separate names. |
| 98 | | __USE_FILE_OFFSET64 Define 64bit interface as default. |
| 99 | | __USE_MISC Define things from 4.3BSD or System V Unix. |
| 100 | | __USE_ATFILE Define *at interfaces and AT_* constants for them. |
| 101 | | __USE_DYNAMIC_STACK_SIZE Define correct (but non compile-time constant) |
| 102 | | MINSIGSTKSZ, SIGSTKSZ and PTHREAD_STACK_MIN. |
| 103 | | __USE_GNU Define GNU extensions. |
| 104 | | __USE_FORTIFY_LEVEL Additional security measures used, according to level. |
| 105 | | |
| 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. |
| 110 | | |
| 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 |
| 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. */ |
| 123 | | |
| 124 | | |
| 125 | | /* Undefine everything, so we get a clean slate. */ |
| 126 | | #undef __USE_ISOC11 |
| 127 | | #undef __USE_ISOC99 |
| 128 | | #undef __USE_ISOC95 |
| 129 | | #undef __USE_ISOCXX11 |
| 130 | | #undef __USE_POSIX |
| 131 | | #undef __USE_POSIX2 |
| 132 | | #undef __USE_POSIX199309 |
| 133 | | #undef __USE_POSIX199506 |
| 134 | | #undef __USE_XOPEN |
| 135 | | #undef __USE_XOPEN_EXTENDED |
| 136 | | #undef __USE_UNIX98 |
| 137 | | #undef __USE_XOPEN2K |
| 138 | | #undef __USE_XOPEN2KXSI |
| 139 | | #undef __USE_XOPEN2K8 |
| 140 | | #undef __USE_XOPEN2K8XSI |
| 141 | | #undef __USE_LARGEFILE |
| 142 | | #undef __USE_LARGEFILE64 |
| 143 | | #undef __USE_FILE_OFFSET64 |
| 144 | | #undef __USE_MISC |
| 145 | | #undef __USE_ATFILE |
| 146 | | #undef __USE_DYNAMIC_STACK_SIZE |
| 147 | | #undef __USE_GNU |
| 148 | | #undef __USE_FORTIFY_LEVEL |
| 149 | | #undef __KERNEL_STRICT_NAMES |
| 150 | | #undef __GLIBC_USE_ISOC2X |
| 151 | | #undef __GLIBC_USE_DEPRECATED_GETS |
| 152 | | #undef __GLIBC_USE_DEPRECATED_SCANF |
| 153 | | |
| 154 | | /* Suppress kernel-name space pollution unless user expressedly asks |
| 155 | | for it. */ |
| 156 | | #ifndef _LOOSE_KERNEL_NAMES |
| 157 | | # define __KERNEL_STRICT_NAMES |
| 158 | | #endif |
| 159 | | |
| 160 | | /* Convenience macro to test the version of gcc. |
| 161 | | Use like this: |
| 162 | | #if __GNUC_PREREQ (2,8) |
| 163 | | ... code requiring gcc 2.8 or later ... |
| 164 | | #endif |
| 165 | | Note: only works for GCC 2.0 and later, because __GNUC_MINOR__ was |
| 166 | | added in 2.0. */ |
| 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 | | |
| 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 | | |
| 185 | | /* Whether to use feature set F. */ |
| 186 | | #define __GLIBC_USE(F) __GLIBC_USE_ ## F |
| 187 | | |
| 188 | | /* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for |
| 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 |
| 194 | | # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" |
| 195 | | # undef _DEFAULT_SOURCE |
| 196 | | # define _DEFAULT_SOURCE 1 |
| 197 | | #endif |
| 198 | | |
| 199 | | /* If _GNU_SOURCE was defined by the user, turn on all the other features. */ |
| 200 | | #ifdef _GNU_SOURCE |
| 201 | | # undef _ISOC95_SOURCE |
| 202 | | # define _ISOC95_SOURCE 1 |
| 203 | | # undef _ISOC99_SOURCE |
| 204 | | # define _ISOC99_SOURCE 1 |
| 205 | | # undef _ISOC11_SOURCE |
| 206 | | # define _ISOC11_SOURCE 1 |
| 207 | | # undef _ISOC2X_SOURCE |
| 208 | | # define _ISOC2X_SOURCE 1 |
| 209 | | # undef _POSIX_SOURCE |
| 210 | | # define _POSIX_SOURCE 1 |
| 211 | | # undef _POSIX_C_SOURCE |
| 212 | | # define _POSIX_C_SOURCE 200809L |
| 213 | | # undef _XOPEN_SOURCE |
| 214 | | # define _XOPEN_SOURCE 700 |
| 215 | | # undef _XOPEN_SOURCE_EXTENDED |
| 216 | | # define _XOPEN_SOURCE_EXTENDED 1 |
| 217 | | # undef _LARGEFILE64_SOURCE |
| 218 | | # define _LARGEFILE64_SOURCE 1 |
| 219 | | # undef _DEFAULT_SOURCE |
| 220 | | # define _DEFAULT_SOURCE 1 |
| 221 | | # undef _ATFILE_SOURCE |
| 222 | | # define _ATFILE_SOURCE 1 |
| 223 | | # undef _DYNAMIC_STACK_SIZE_SOURCE |
| 224 | | # define _DYNAMIC_STACK_SIZE_SOURCE 1 |
| 225 | | #endif |
| 226 | | |
| 227 | | /* If nothing (other than _GNU_SOURCE and _DEFAULT_SOURCE) is defined, |
| 228 | | define _DEFAULT_SOURCE. */ |
| 229 | | #if (defined _DEFAULT_SOURCE \ |
| 230 | | || (!defined __STRICT_ANSI__ \ |
| 231 | | && !defined _ISOC99_SOURCE && !defined _ISOC11_SOURCE \ |
| 232 | | && !defined _ISOC2X_SOURCE \ |
| 233 | | && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE \ |
| 234 | | && !defined _XOPEN_SOURCE)) |
| 235 | | # undef _DEFAULT_SOURCE |
| 236 | | # define _DEFAULT_SOURCE 1 |
| 237 | | #endif |
| 238 | | |
| 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 | | |
| 247 | | /* This is to enable the ISO C11 extension. */ |
| 248 | | #if (defined _ISOC11_SOURCE || defined _ISOC2X_SOURCE \ |
| 249 | | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L)) |
| 250 | | # define __USE_ISOC11 1 |
| 251 | | #endif |
| 252 | | |
| 253 | | /* This is to enable the ISO C99 extension. */ |
| 254 | | #if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \ |
| 255 | | || defined _ISOC2X_SOURCE \ |
| 256 | | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) |
| 257 | | # define __USE_ISOC99 1 |
| 258 | | #endif |
| 259 | | |
| 260 | | /* This is to enable the ISO C90 Amendment 1:1995 extension. */ |
| 261 | | #if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \ |
| 262 | | || defined _ISOC2X_SOURCE \ |
| 263 | | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L)) |
| 264 | | # define __USE_ISOC95 1 |
| 265 | | #endif |
| 266 | | |
| 267 | | #ifdef __cplusplus |
| 268 | | /* This is to enable compatibility for ISO C++17. */ |
| 269 | | # if __cplusplus >= 201703L |
| 270 | | # define __USE_ISOC11 1 |
| 271 | | # endif |
| 272 | | /* This is to enable compatibility for ISO C++11. |
| 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 |
| 278 | | #endif |
| 279 | | |
| 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 |
| 292 | | |
| 293 | | #if ((!defined __STRICT_ANSI__ \ |
| 294 | | || (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500)) \ |
| 295 | | && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE) |
| 296 | | # define _POSIX_SOURCE 1 |
| 297 | | # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500 |
| 298 | | # define _POSIX_C_SOURCE 2 |
| 299 | | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600 |
| 300 | | # define _POSIX_C_SOURCE 199506L |
| 301 | | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700 |
| 302 | | # define _POSIX_C_SOURCE 200112L |
| 303 | | # else |
| 304 | | # define _POSIX_C_SOURCE 200809L |
| 305 | | # endif |
| 306 | | # define __USE_POSIX_IMPLICITLY 1 |
| 307 | | #endif |
| 308 | | |
| 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 | | |
| 322 | | #if (defined _POSIX_SOURCE \ |
| 323 | | || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1) \ |
| 324 | | || defined _XOPEN_SOURCE) |
| 325 | | # define __USE_POSIX 1 |
| 326 | | #endif |
| 327 | | |
| 328 | | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE |
| 329 | | # define __USE_POSIX2 1 |
| 330 | | #endif |
| 331 | | |
| 332 | | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199309L |
| 333 | | # define __USE_POSIX199309 1 |
| 334 | | #endif |
| 335 | | |
| 336 | | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L |
| 337 | | # define __USE_POSIX199506 1 |
| 338 | | #endif |
| 339 | | |
| 340 | | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L |
| 341 | | # define __USE_XOPEN2K 1 |
| 342 | | # undef __USE_ISOC95 |
| 343 | | # define __USE_ISOC95 1 |
| 344 | | # undef __USE_ISOC99 |
| 345 | | # define __USE_ISOC99 1 |
| 346 | | #endif |
| 347 | | |
| 348 | | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200809L |
| 349 | | # define __USE_XOPEN2K8 1 |
| 350 | | # undef _ATFILE_SOURCE |
| 351 | | # define _ATFILE_SOURCE 1 |
| 352 | | #endif |
| 353 | | |
| 354 | | #ifdef _XOPEN_SOURCE |
| 355 | | # define __USE_XOPEN 1 |
| 356 | | # if (_XOPEN_SOURCE - 0) >= 500 |
| 357 | | # define __USE_XOPEN_EXTENDED 1 |
| 358 | | # define __USE_UNIX98 1 |
| 359 | | # undef _LARGEFILE_SOURCE |
| 360 | | # define _LARGEFILE_SOURCE 1 |
| 361 | | # if (_XOPEN_SOURCE - 0) >= 600 |
| 362 | | # if (_XOPEN_SOURCE - 0) >= 700 |
| 363 | | # define __USE_XOPEN2K8 1 |
| 364 | | # define __USE_XOPEN2K8XSI 1 |
| 365 | | # endif |
| 366 | | # define __USE_XOPEN2K 1 |
| 367 | | # define __USE_XOPEN2KXSI 1 |
| 368 | | # undef __USE_ISOC95 |
| 369 | | # define __USE_ISOC95 1 |
| 370 | | # undef __USE_ISOC99 |
| 371 | | # define __USE_ISOC99 1 |
| 372 | | # endif |
| 373 | | # else |
| 374 | | # ifdef _XOPEN_SOURCE_EXTENDED |
| 375 | | # define __USE_XOPEN_EXTENDED 1 |
| 376 | | # endif |
| 377 | | # endif |
| 378 | | #endif |
| 379 | | |
| 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 | | |
| 392 | | #include <features-time64.h> |
| 393 | | |
| 394 | | #if defined _DEFAULT_SOURCE |
| 395 | | # define __USE_MISC 1 |
| 396 | | #endif |
| 397 | | |
| 398 | | #ifdef _ATFILE_SOURCE |
| 399 | | # define __USE_ATFILE 1 |
| 400 | | #endif |
| 401 | | |
| 402 | | #ifdef _DYNAMIC_STACK_SIZE_SOURCE |
| 403 | | # define __USE_DYNAMIC_STACK_SIZE 1 |
| 404 | | #endif |
| 405 | | |
| 406 | | #ifdef _GNU_SOURCE |
| 407 | | # define __USE_GNU 1 |
| 408 | | #endif |
| 409 | | |
| 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 |
| 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 |
| 420 | | # elif _FORTIFY_SOURCE > 1 |
| 421 | | # if _FORTIFY_SOURCE > 2 |
| 422 | | # warning _FORTIFY_SOURCE > 2 is treated like 2 on this platform |
| 423 | | # endif |
| 424 | | # define __USE_FORTIFY_LEVEL 2 |
| 425 | | # else |
| 426 | | # define __USE_FORTIFY_LEVEL 1 |
| 427 | | # endif |
| 428 | | #endif |
| 429 | | #ifndef __USE_FORTIFY_LEVEL |
| 430 | | # define __USE_FORTIFY_LEVEL 0 |
| 431 | | #endif |
| 432 | | |
| 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 | | |
| 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. */ |
| 455 | | #if (defined __USE_GNU \ |
| 456 | | && (defined __cplusplus \ |
| 457 | | ? (__cplusplus < 201103L && !defined __GXX_EXPERIMENTAL_CXX0X__) \ |
| 458 | | : (!defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L))) |
| 459 | | # define __GLIBC_USE_DEPRECATED_SCANF 1 |
| 460 | | #else |
| 461 | | # define __GLIBC_USE_DEPRECATED_SCANF 0 |
| 462 | | #endif |
| 463 | | |
| 464 | | /* Get definitions of __STDC_* predefined macros, if the compiler has |
| 465 | | not preincluded this header automatically. */ |
| 466 | | #include <stdc-predef.h> |
| 467 | | |
| 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 |
| 480 | | /* Zig patch: we pass `-D__GLIBC_MINOR__=XX` depending on the target. */ |
| 481 | | |
| 482 | | #define __GLIBC_PREREQ(maj, min) \ |
| 483 | | ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) |
| 484 | | |
| 485 | | /* This is here only because every header file already includes this one. */ |
| 486 | | #ifndef __ASSEMBLER__ |
| 487 | | # ifndef _SYS_CDEFS_H |
| 488 | | # include <sys/cdefs.h> |
| 489 | | # endif |
| 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 |
| 494 | | # define __USE_LARGEFILE 1 |
| 495 | | # define __USE_LARGEFILE64 1 |
| 496 | | # endif |
| 497 | | |
| 498 | | #endif /* !ASSEMBLER */ |
| 499 | | |
| 500 | | /* Decide whether we can define 'extern inline' functions in headers. */ |
| 501 | | #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ |
| 502 | | && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \ |
| 503 | | && defined __extern_inline |
| 504 | | # define __USE_EXTERN_INLINES 1 |
| 505 | | #endif |
| 506 | | |
| 507 | | |
| 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> |
| 513 | | |
| 514 | | |
| 515 | | #endif /* features.h */ |
Andrew Kelley <andrew@ziglang.org> 2021-12-15 17:57:33-07:00