1 /* 2 * Written by Joel Sherrill <joel@OARcorp.com>. 3 * 4 * COPYRIGHT (c) 1989-2014. 5 * 6 * On-Line Applications Research Corporation (OAR). 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose without fee is hereby granted, provided that this entire notice 10 * is included in all copies of any software which is or includes a copy 11 * or modification of this software. 12 * 13 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED 14 * WARRANTY. IN PARTICULAR, THE AUTHOR MAKES NO REPRESENTATION 15 * OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY OF THIS 16 * SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. 17 * 18 * $Id$ 19 */ 20 21 #ifndef _SYS_FEATURES_H 22 #define _SYS_FEATURES_H 23 24 #ifdef __cplusplus 25 extern "C" { 26 #endif 27 28 #include <picolibc.h> 29 30 /* Macro to test version of GCC. Returns 0 for non-GCC or too old GCC. */ 31 #ifndef __GNUC_PREREQ 32 # if defined __GNUC__ && defined __GNUC_MINOR__ 33 # define __GNUC_PREREQ(maj, min) \ 34 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 35 # else 36 # define __GNUC_PREREQ(maj, min) 0 37 # endif 38 #endif /* __GNUC_PREREQ */ 39 /* Version with trailing underscores for BSD compatibility. */ 40 #define __GNUC_PREREQ__(ma, mi) __GNUC_PREREQ(ma, mi) 41 42 /* 43 * Feature test macros control which symbols are exposed by the system 44 * headers. Any of these must be defined before including any headers. 45 * 46 * __STRICT_ANSI__ (defined by gcc -ansi, -std=c90, -std=c99, or -std=c11) 47 * ISO C 48 * 49 * _POSIX_SOURCE (deprecated by _POSIX_C_SOURCE=1) 50 * _POSIX_C_SOURCE >= 1 51 * POSIX.1-1990 52 * 53 * _POSIX_C_SOURCE >= 2 54 * POSIX.2-1992 55 * 56 * _POSIX_C_SOURCE >= 199309L 57 * POSIX.1b-1993 Real-time extensions 58 * 59 * _POSIX_C_SOURCE >= 199506L 60 * POSIX.1c-1995 Threads extensions 61 * 62 * _POSIX_C_SOURCE >= 200112L 63 * POSIX.1-2001 and C99 64 * 65 * _POSIX_C_SOURCE >= 200809L 66 * POSIX.1-2008 67 * 68 * _POSIX_C_SOURCE >= 202405L 69 * POSIX.1-2024 70 * 71 * _XOPEN_SOURCE 72 * POSIX.1-1990 and XPG4 73 * 74 * _XOPEN_SOURCE_EXTENDED 75 * SUSv1 (POSIX.2-1992 plus XPG4v2) 76 * 77 * _XOPEN_SOURCE >= 500 78 * SUSv2 (POSIX.1c-1995 plus XSI) 79 * 80 * _XOPEN_SOURCE >= 600 81 * SUSv3 (POSIX.1-2001 plus XSI) and C99 82 * 83 * _XOPEN_SOURCE >= 700 84 * SUSv4 (POSIX.1-2008 plus XSI) 85 * 86 * _ISOC99_SOURCE or gcc -std=c99 or g++ 87 * ISO C99 88 * 89 * _ISOC11_SOURCE or gcc -std=c11 or g++ -std=c++11 90 * ISO C11 91 * 92 * _ISOC2x_SOURCE or gcc -std=c2x or g++ -std=c++20 93 * ISO C11 94 * 95 * _ATFILE_SOURCE (implied by _POSIX_C_SOURCE >= 200809L) 96 * "at" functions 97 * 98 * _LARGEFILE_SOURCE (deprecated by _XOPEN_SOURCE >= 500) 99 * fseeko, ftello 100 * 101 * _GNU_SOURCE 102 * All of the above plus GNU extensions 103 * 104 * _BSD_SOURCE (deprecated by _DEFAULT_SOURCE) 105 * _SVID_SOURCE (deprecated by _DEFAULT_SOURCE) 106 * _DEFAULT_SOURCE (or none of the above) 107 * POSIX-1.2024 with BSD and SVr4 extensions 108 * 109 * _FORTIFY_SOURCE = 1, 2 or 3 110 * Object Size Checking function wrappers 111 * 112 * _ZEPHYR_SOURCE 113 * Zephyr. ISO C + a small selection of other APIs. 114 */ 115 116 #ifdef _GNU_SOURCE 117 #undef _ATFILE_SOURCE 118 #define _ATFILE_SOURCE 1 119 #undef _DEFAULT_SOURCE 120 #define _DEFAULT_SOURCE 1 121 #undef _ISOC99_SOURCE 122 #define _ISOC99_SOURCE 1 123 #undef _ISOC11_SOURCE 124 #define _ISOC11_SOURCE 1 125 #undef _ISOC2X_SOURCE 126 #define _ISOC2X_SOURCE 1 127 #undef _POSIX_SOURCE 128 #define _POSIX_SOURCE 1 129 #undef _POSIX_C_SOURCE 130 #define _POSIX_C_SOURCE 200809L 131 #undef _XOPEN_SOURCE 132 #define _XOPEN_SOURCE 700 133 #undef _XOPEN_SOURCE_EXTENDED 134 #define _XOPEN_SOURCE_EXTENDED 1 135 #undef _LARGEFILE64_SOURCE 136 #define _LARGEFILE64_SOURCE 1 137 #endif /* _GNU_SOURCE */ 138 139 /* When building for Zephyr, set _ZEPHYR_SOURCE unless some other API 140 * indicator is set by the application. Don't check __STRICT_ANSI__ as that 141 * is set by the compiler for -std=cxx, or _POSIX_C_SOURCE as Zephyr defines 142 * that for picolibc currently. 143 */ 144 145 #if defined(__ZEPHYR__) && !defined(_ZEPHYR_SOURCE) && \ 146 !defined(_GNU_SOURCE)&& \ 147 !defined(_BSD_SOURCE) && \ 148 !defined(_SVID_SOURCE) && \ 149 !defined(_DEFAULT_SOURCE) 150 #define _ZEPHYR_SOURCE 1 151 #endif 152 153 #if defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || \ 154 (!defined(__STRICT_ANSI__) && !defined(_ANSI_SOURCE) && \ 155 !defined(_ISOC99_SOURCE) && !defined(_POSIX_SOURCE) && \ 156 !defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) && \ 157 !defined(_ZEPHYR_SOURCE)) 158 #undef _DEFAULT_SOURCE 159 #define _DEFAULT_SOURCE 1 160 #endif 161 162 #if defined(_DEFAULT_SOURCE) 163 #undef _POSIX_SOURCE 164 #define _POSIX_SOURCE 1 165 #undef _POSIX_C_SOURCE 166 #define _POSIX_C_SOURCE 202405L 167 #endif 168 169 #if !defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) && \ 170 ((!defined(__STRICT_ANSI__) && !defined(_ANSI_SOURCE)) || \ 171 (_XOPEN_SOURCE - 0) >= 500) 172 #define _POSIX_SOURCE 1 173 #if !defined(_XOPEN_SOURCE) || (_XOPEN_SOURCE - 0) >= 700 174 #define _POSIX_C_SOURCE 200809L 175 #elif (_XOPEN_SOURCE - 0) >= 600 176 #define _POSIX_C_SOURCE 200112L 177 #elif (_XOPEN_SOURCE - 0) >= 500 178 #define _POSIX_C_SOURCE 199506L 179 #elif (_XOPEN_SOURCE - 0) < 500 180 #define _POSIX_C_SOURCE 2 181 #endif 182 #endif 183 184 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200809 185 #undef _ATFILE_SOURCE 186 #define _ATFILE_SOURCE 1 187 #endif 188 189 #ifdef _ZEPHYR_SOURCE 190 #undef _ISOC99_SOURCE 191 #define _ISOC99_SOURCE 1 192 #undef _ISOC11_SOURCE 193 #define _ISOC11_SOURCE 1 194 #undef _ANSI_SOURCE 195 #define _ANSI_SOURCE 1 196 #endif 197 198 /* 199 * The following private macros are used throughout the headers to control 200 * which symbols should be exposed. They are for internal use only, as 201 * indicated by the leading double underscore, and must never be used outside 202 * of these headers. 203 * 204 * __POSIX_VISIBLE 205 * any version of POSIX.1; enabled by default, or with _POSIX_SOURCE, 206 * any value of _POSIX_C_SOURCE, or _XOPEN_SOURCE >= 500. 207 * 208 * __POSIX_VISIBLE >= 2 209 * POSIX.2-1992; enabled by default, with _POSIX_C_SOURCE >= 2, 210 * or _XOPEN_SOURCE >= 500. 211 * 212 * __POSIX_VISIBLE >= 199309 213 * POSIX.1b-1993; enabled by default, with _POSIX_C_SOURCE >= 199309L, 214 * or _XOPEN_SOURCE >= 500. 215 * 216 * __POSIX_VISIBLE >= 199506 217 * POSIX.1c-1995; enabled by default, with _POSIX_C_SOURCE >= 199506L, 218 * or _XOPEN_SOURCE >= 500. 219 * 220 * __POSIX_VISIBLE >= 200112 221 * POSIX.1-2001; enabled by default, with _POSIX_C_SOURCE >= 200112L, 222 * or _XOPEN_SOURCE >= 600. 223 * 224 * __POSIX_VISIBLE >= 200809 225 * POSIX.1-2008; enabled by default, with _POSIX_C_SOURCE >= 200809L, 226 * or _XOPEN_SOURCE >= 700. 227 * 228 * __POSIX_VISIBLE >= 202405 229 * POSIX.1-2024; enabled by default, with _POSIX_C_SOURCE >= 202405L, 230 * or _XOPEN_SOURCE >= 700. 231 * 232 * __XSI_VISIBLE 233 * XPG4 XSI extensions; enabled with any version of _XOPEN_SOURCE. 234 * 235 * __XSI_VISIBLE >= 4 236 * SUSv1 XSI extensions; enabled with both _XOPEN_SOURCE and 237 * _XOPEN_SOURCE_EXTENDED together. 238 * 239 * __XSI_VISIBLE >= 500 240 * SUSv2 XSI extensions; enabled with _XOPEN_SOURCE >= 500. 241 * 242 * __XSI_VISIBLE >= 600 243 * SUSv3 XSI extensions; enabled with _XOPEN_SOURCE >= 600. 244 * 245 * __XSI_VISIBLE >= 700 246 * SUSv4 XSI extensions; enabled with _XOPEN_SOURCE >= 700. 247 * 248 * __ISO_C_VISIBLE >= 1999 249 * ISO C99; enabled with gcc -std=c99 or newer (on by default since GCC 5), 250 * any version of C++, or with _ISOC99_SOURCE, _POSIX_C_SOURCE >= 200112L, 251 * or _XOPEN_SOURCE >= 600. 252 * 253 * __ISO_C_VISIBLE >= 2011 254 * ISO C11; enabled with gcc -std=c11 or newer (on by default since GCC 5), 255 * g++ -std=c++11 or newer (on by default since GCC 6), or with 256 * _ISOC11_SOURCE. 257 * 258 * __ISO_C_VISIBLE >= 2020 259 * ISO C2x; enabled with gcc -std=c2x or newer, 260 * g++ -std=c++20 or newer, or with 261 * _ISOC2X_SOURCE. 262 * 263 * __ATFILE_VISIBLE 264 * "at" functions; enabled by default, with _ATFILE_SOURCE, 265 * _POSIX_C_SOURCE >= 200809L, or _XOPEN_SOURCE >= 700. 266 * 267 * __LARGEFILE_VISIBLE 268 * fseeko, ftello; enabled with _LARGEFILE_SOURCE or _XOPEN_SOURCE >= 500. 269 * 270 * __LARGEFILE64_VISIBLE 271 * additional large file extensions; enabled with _LARGEFILE64_SOURCE. 272 * 273 * __BSD_VISIBLE 274 * BSD extensions; enabled by default, or with _BSD_SOURCE. 275 * 276 * __SVID_VISIBLE 277 * SVr4 extensions; enabled by default, or with _SVID_SOURCE. 278 * 279 * __MISC_VISIBLE 280 * Extensions found in both BSD and SVr4 (shorthand for 281 * (__BSD_VISIBLE || __SVID_VISIBLE)), or newlib-specific 282 * extensions; enabled by default. 283 * 284 * __GNU_VISIBLE 285 * GNU extensions; enabled with _GNU_SOURCE. 286 * 287 * __SSP_FORTIFY_LEVEL 288 * Object Size Checking; defined to 0 (off), 1, 2 or 3. 289 * 290 * __ZEPHYR_VISIBLE 291 * Zephyr extensions; enabled with _ZEPHYR_SOURCE. 292 * 293 * In all cases above, "enabled by default" means either by defining 294 * _DEFAULT_SOURCE, or by not defining any of the public feature test macros. 295 */ 296 297 #ifdef _ATFILE_SOURCE 298 #define __ATFILE_VISIBLE 1 299 #else 300 #define __ATFILE_VISIBLE 0 301 #endif 302 303 #ifdef _DEFAULT_SOURCE 304 #define __BSD_VISIBLE 1 305 #else 306 #define __BSD_VISIBLE 0 307 #endif 308 309 #ifdef _GNU_SOURCE 310 #define __GNU_VISIBLE 1 311 #else 312 #define __GNU_VISIBLE 0 313 #endif 314 315 #ifdef _ZEPHYR_SOURCE 316 #define __ZEPHYR_VISIBLE 1 317 #else 318 #define __ZEPHYR_VISIBLE 0 319 #endif 320 321 #if defined(_ISOC2X_SOURCE) || \ 322 (__STDC_VERSION__ - 0) > 201710L || (__cplusplus - 0) >= 202002L 323 #define __ISO_C_VISIBLE 2020 324 #elif defined(_ISOC11_SOURCE) || \ 325 (__STDC_VERSION__ - 0) >= 201112L || (__cplusplus - 0) >= 201103L 326 #define __ISO_C_VISIBLE 2011 327 #elif defined(_ISOC99_SOURCE) || (_POSIX_C_SOURCE - 0) >= 200112L || \ 328 (__STDC_VERSION__ - 0) >= 199901L || defined(__cplusplus) 329 #define __ISO_C_VISIBLE 1999 330 #else 331 #define __ISO_C_VISIBLE 1990 332 #endif 333 334 #if defined(_LARGEFILE_SOURCE) || (_XOPEN_SOURCE - 0) >= 500 335 #define __LARGEFILE_VISIBLE 1 336 #else 337 #define __LARGEFILE_VISIBLE 0 338 #endif 339 340 #ifdef _LARGEFILE64_SOURCE 341 #define __LARGEFILE64_VISIBLE 1 342 #else 343 #define __LARGEFILE64_VISIBLE 0 344 #endif 345 346 #ifdef _DEFAULT_SOURCE 347 #define __MISC_VISIBLE 1 348 #else 349 #define __MISC_VISIBLE 0 350 #endif 351 352 #if (_POSIX_C_SOURCE - 0) >= 202405L 353 #define __POSIX_VISIBLE 202405 354 #elif (_POSIX_C_SOURCE - 0) >= 200809L 355 #define __POSIX_VISIBLE 200809 356 #elif (_POSIX_C_SOURCE - 0) >= 200112L 357 #define __POSIX_VISIBLE 200112 358 #elif (_POSIX_C_SOURCE - 0) >= 199506L 359 #define __POSIX_VISIBLE 199506 360 #elif (_POSIX_C_SOURCE - 0) >= 199309L 361 #define __POSIX_VISIBLE 199309 362 #elif (_POSIX_C_SOURCE - 0) >= 2 || defined(_XOPEN_SOURCE) 363 #define __POSIX_VISIBLE 199209 364 #elif defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) 365 #define __POSIX_VISIBLE 199009 366 #else 367 #define __POSIX_VISIBLE 0 368 #endif 369 370 #ifdef _DEFAULT_SOURCE 371 #define __SVID_VISIBLE 1 372 #else 373 #define __SVID_VISIBLE 0 374 #endif 375 376 #if (_XOPEN_SOURCE - 0) >= 700 377 #define __XSI_VISIBLE 700 378 #elif (_XOPEN_SOURCE - 0) >= 600 379 #define __XSI_VISIBLE 600 380 #elif (_XOPEN_SOURCE - 0) >= 500 381 #define __XSI_VISIBLE 500 382 #elif defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED) 383 #define __XSI_VISIBLE 4 384 #elif defined(_XOPEN_SOURCE) 385 #define __XSI_VISIBLE 1 386 #else 387 #define __XSI_VISIBLE 0 388 #endif 389 390 #if _FORTIFY_SOURCE > 0 && !defined(__cplusplus) && !defined(__lint__) && \ 391 (__OPTIMIZE__ > 0 || defined(__clang__)) && __GNUC_PREREQ__(4, 1) && \ 392 !defined(_LIBC) 393 # if _FORTIFY_SOURCE > 2 && defined(__has_builtin) 394 # if __has_builtin(__builtin_dynamic_object_size) 395 # define __SSP_FORTIFY_LEVEL 3 396 # else 397 # define __SSP_FORTIFY_LEVEL 2 398 # endif 399 # elif _FORTIFY_SOURCE > 1 400 # define __SSP_FORTIFY_LEVEL 2 401 # else 402 # define __SSP_FORTIFY_LEVEL 1 403 # endif 404 #else 405 # define __SSP_FORTIFY_LEVEL 0 406 #endif 407 408 /* RTEMS adheres to POSIX -- 1003.1b with some features from annexes. */ 409 410 #ifdef __rtems__ 411 #define _POSIX_JOB_CONTROL 1 412 #define _POSIX_SAVED_IDS 1 413 #define _POSIX_VERSION 199309L 414 #define _POSIX_ASYNCHRONOUS_IO 1 415 #define _POSIX_FSYNC 1 416 #define _POSIX_MAPPED_FILES 1 417 #define _POSIX_MEMLOCK 1 418 #define _POSIX_MEMLOCK_RANGE 1 419 #define _POSIX_MEMORY_PROTECTION 1 420 #define _POSIX_MESSAGE_PASSING 1 421 #define _POSIX_MONOTONIC_CLOCK 200112L 422 #define _POSIX_CLOCK_SELECTION 200112L 423 #define _POSIX_PRIORITIZED_IO 1 424 #define _POSIX_PRIORITY_SCHEDULING 1 425 #define _POSIX_REALTIME_SIGNALS 1 426 #define _POSIX_SEMAPHORES 1 427 #define _POSIX_SHARED_MEMORY_OBJECTS 1 428 #define _POSIX_SYNCHRONIZED_IO 1 429 #define _POSIX_TIMERS 1 430 #define _POSIX_BARRIERS 200112L 431 #define _POSIX_READER_WRITER_LOCKS 200112L 432 #define _POSIX_SPIN_LOCKS 200112L 433 434 435 /* In P1003.1b but defined by drafts at least as early as P1003.1c/D10 */ 436 #define _POSIX_THREADS 1 437 #define _POSIX_THREAD_ATTR_STACKADDR 1 438 #define _POSIX_THREAD_ATTR_STACKSIZE 1 439 #define _POSIX_THREAD_PRIORITY_SCHEDULING 1 440 #define _POSIX_THREAD_PRIO_INHERIT 1 441 #define _POSIX_THREAD_PRIO_PROTECT 1 442 #define _POSIX_THREAD_PROCESS_SHARED 1 443 #define _POSIX_THREAD_SAFE_FUNCTIONS 1 444 445 /* P1003.4b/D8 defines the constants below this comment. */ 446 #define _POSIX_SPAWN 1 447 #define _POSIX_TIMEOUTS 1 448 #define _POSIX_CPUTIME 1 449 #define _POSIX_THREAD_CPUTIME 1 450 #define _POSIX_SPORADIC_SERVER 1 451 #define _POSIX_THREAD_SPORADIC_SERVER 1 452 #define _POSIX_DEVICE_CONTROL 1 453 #define _POSIX_DEVCTL_DIRECTION 1 454 #define _POSIX_INTERRUPT_CONTROL 1 455 #define _POSIX_ADVISORY_INFO 1 456 457 /* UNIX98 added some new pthread mutex attributes */ 458 #define _UNIX98_THREAD_MUTEX_ATTRIBUTES 1 459 460 /* POSIX 1003.26-2003 defined device control method */ 461 #define _POSIX_26_VERSION 200312L 462 463 #endif 464 465 /* XMK loosely adheres to POSIX -- 1003.1 */ 466 #ifdef __XMK__ 467 #define _POSIX_THREADS 1 468 #define _POSIX_THREAD_PRIORITY_SCHEDULING 1 469 #endif 470 471 472 #ifdef __svr4__ 473 # define _POSIX_JOB_CONTROL 1 474 # define _POSIX_SAVED_IDS 1 475 # define _POSIX_VERSION 199009L 476 #endif 477 478 #ifdef __cplusplus 479 } 480 #endif 481 #endif /* _SYS_FEATURES_H */ 482
