1/* Copyright (C) 1991-1993,1995-2006,2007,2009 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, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19#ifndef _FEATURES_H 20#define _FEATURES_H 1 21 22/* These are defined by the user (or the compiler) 23 to specify the desired environment: 24 25 __STRICT_ANSI__ ISO Standard C. 26 _ISOC99_SOURCE Extensions to ISO C89 from ISO C99. 27 _POSIX_SOURCE IEEE Std 1003.1. 28 _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2; 29 if >=199309L, add IEEE Std 1003.1b-1993; 30 if >=199506L, add IEEE Std 1003.1c-1995; 31 if >=200112L, all of IEEE 1003.1-2004 32 if >=200809L, all of IEEE 1003.1-2008 33 _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if 34 Single Unix conformance is wanted, to 600 for the 35 sixth revision, to 700 for the seventh revision. 36 _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions. 37 _LARGEFILE_SOURCE Some more functions for correct standard I/O. 38 _LARGEFILE64_SOURCE Additional functionality from LFS for large files. 39 _FILE_OFFSET_BITS=N Select default filesystem interface. 40 _BSD_SOURCE ISO C, POSIX, and 4.3BSD things. 41 _SVID_SOURCE ISO C, POSIX, and SVID things. 42 _ATFILE_SOURCE Additional *at interfaces. 43 _GNU_SOURCE All of the above, plus GNU extensions. 44 _REENTRANT Select additionally reentrant object. 45 _THREAD_SAFE Same as _REENTRANT, often used by other systems. 46 _FORTIFY_SOURCE If set to numeric value > 0 additional security 47 measures are defined, according to level. 48 49 The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__. 50 If none of these are defined, the default is to have _SVID_SOURCE, 51 _BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to 52 200112L. If more than one of these are defined, they accumulate. 53 For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE 54 together give you ISO C, 1003.1, and 1003.2, but nothing else. 55 56 These are defined by this file and are used by the 57 header files to decide what to declare or define: 58 59 __USE_ISOC99 Define ISO C99 things. 60 __USE_ISOC95 Define ISO C90 AMD1 (C95) things. 61 __USE_POSIX Define IEEE Std 1003.1 things. 62 __USE_POSIX2 Define IEEE Std 1003.2 things. 63 __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things. 64 __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things. 65 __USE_XOPEN Define XPG things. 66 __USE_XOPEN_EXTENDED Define X/Open Unix things. 67 __USE_UNIX98 Define Single Unix V2 things. 68 __USE_XOPEN2K Define XPG6 things. 69 __USE_XOPEN2K8 Define XPG7 things. 70 __USE_LARGEFILE Define correct standard I/O things. 71 __USE_LARGEFILE64 Define LFS things with separate names. 72 __USE_FILE_OFFSET64 Define 64bit interface as default. 73 __USE_BSD Define 4.3BSD things. 74 __USE_SVID Define SVID things. 75 __USE_MISC Define things common to BSD and System V Unix. 76 __USE_ATFILE Define *at interfaces and AT_* constants for them. 77 __USE_GNU Define GNU extensions. 78 __USE_REENTRANT Define reentrant/thread-safe *_r functions. 79 __USE_FORTIFY_LEVEL Additional security measures used, according to level. 80 __FAVOR_BSD Favor 4.3BSD things in cases of conflict. 81 82 The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are 83 defined by this file unconditionally. `__GNU_LIBRARY__' is provided 84 only for compatibility. All new code should use the other symbols 85 to test for features. 86 87 All macros listed above as possibly being defined by this file are 88 explicitly undefined if they are not explicitly defined. 89 Feature-test macros that are not defined by the user or compiler 90 but are implied by the other feature-test macros defined (or by the 91 lack of any definitions) are defined by the file. */ 92 93 94/* Undefine everything, so we get a clean slate. */ 95#undef __USE_ISOC99 96#undef __USE_ISOC95 97#undef __USE_POSIX 98#undef __USE_POSIX2 99#undef __USE_POSIX199309 100#undef __USE_POSIX199506 101#undef __USE_XOPEN 102#undef __USE_XOPEN_EXTENDED 103#undef __USE_UNIX98 104#undef __USE_XOPEN2K 105#undef __USE_XOPEN2K8 106#undef __USE_LARGEFILE 107#undef __USE_LARGEFILE64 108#undef __USE_FILE_OFFSET64 109#undef __USE_BSD 110#undef __USE_SVID 111#undef __USE_MISC 112#undef __USE_ATFILE 113#undef __USE_GNU 114#undef __USE_REENTRANT 115#undef __USE_FORTIFY_LEVEL 116#undef __FAVOR_BSD 117#undef __KERNEL_STRICT_NAMES 118 119/* Suppress kernel-name space pollution unless user expressedly asks 120 for it. */ 121#ifndef _LOOSE_KERNEL_NAMES 122# define __KERNEL_STRICT_NAMES 123#endif 124 125/* Always use ISO C things. */ 126#define __USE_ANSI 1 127 128/* Convenience macros to test the versions of glibc and gcc. 129 Use them like this: 130 #if __GNUC_PREREQ (2,8) 131 ... code requiring gcc 2.8 or later ... 132 #endif 133 Note - they won't work for gcc1 or glibc1, since the _MINOR macros 134 were not defined then. */ 135#if defined __GNUC__ && defined __GNUC_MINOR__ 136# define __GNUC_PREREQ(maj, min) \ 137 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 138#else 139# define __GNUC_PREREQ(maj, min) 0 140#endif 141 142 143/* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */ 144#if defined _BSD_SOURCE && \ 145 !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \ 146 defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \ 147 defined _GNU_SOURCE || defined _SVID_SOURCE) 148# define __FAVOR_BSD 1 149#endif 150 151/* If _GNU_SOURCE was defined by the user, turn on all the other features. */ 152#ifdef _GNU_SOURCE 153# undef _ISOC99_SOURCE 154# define _ISOC99_SOURCE 1 155# undef _POSIX_SOURCE 156# define _POSIX_SOURCE 1 157# undef _POSIX_C_SOURCE 158# define _POSIX_C_SOURCE 200809L 159# undef _XOPEN_SOURCE 160# define _XOPEN_SOURCE 700 161# undef _XOPEN_SOURCE_EXTENDED 162# define _XOPEN_SOURCE_EXTENDED 1 163# undef _LARGEFILE64_SOURCE 164# define _LARGEFILE64_SOURCE 1 165# undef _BSD_SOURCE 166# define _BSD_SOURCE 1 167# undef _SVID_SOURCE 168# define _SVID_SOURCE 1 169# undef _ATFILE_SOURCE 170# define _ATFILE_SOURCE 1 171#endif 172 173/* This macro indicates that the installed library is uClibc. Use 174 * __UCLIBC_MAJOR__ and __UCLIBC_MINOR__ to test for the features in 175 * specific releases. */ 176#define __UCLIBC__ 1 177 178#ifdef __UCLIBC__ 179/* Load up the current set of uClibc supported features along 180 * with the current uClibc major and minor version numbers. 181 * For uClibc release 0.9.26, these numbers would be: 182 * #define __UCLIBC_MAJOR__ 0 183 * #define __UCLIBC_MINOR__ 9 184 * #define __UCLIBC_SUBLEVEL__ 26 185 */ 186# define __need_uClibc_config_h 187# include <bits/uClibc_config.h> 188# undef __need_uClibc_config_h 189 190/* For uClibc, always optimize for size -- this should disable 191 * a lot of expensive inlining... 192 * TODO: this is wrong! __OPTIMIZE_SIZE__ is an indicator of 193 * gcc -Os compile. We should not mess with compiler inlines. 194 * We should instead disable __USE_EXTERN_INLINES unconditionally, 195 * or maybe actually audit and test uclibc to work correctly 196 * with __USE_EXTERN_INLINES on. 197 */ 198# define __OPTIMIZE_SIZE__ 1 199 200/* disable unsupported features */ 201# undef __LDBL_COMPAT 202 203# ifndef __UCLIBC_HAS_FORTIFY__ 204# undef _FORTIFY_SOURCE 205# endif 206 207# ifndef __UCLIBC_HAS_THREADS__ 208# if defined _REENTRANT || defined _THREAD_SAFE 209# warning requested reentrant code, but thread support was disabled 210# undef _REENTRANT 211# undef _THREAD_SAFE 212# endif 213# endif 214 215# ifndef __UCLIBC_HAS_LFS__ 216# undef _LARGEFILE64_SOURCE 217/* NOTE: This is probably incorrect on a 64-bit arch... */ 218# if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 219# error It appears you have defined _FILE_OFFSET_BITS=64. Unfortunately, \ 220uClibc was built without large file support enabled. 221# endif 222# elif defined __BCC__ 223# error BCC does not support LFS, please disable it 224# endif 225#endif /* __UCLIBC__ */ 226 227/* If nothing (other than _GNU_SOURCE) is defined, 228 define _BSD_SOURCE and _SVID_SOURCE. */ 229#if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \ 230 !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \ 231 !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \ 232 !defined _BSD_SOURCE && !defined _SVID_SOURCE) 233# define _BSD_SOURCE 1 234# define _SVID_SOURCE 1 235#endif 236 237/* This is to enable the ISO C99 extension. Also recognize the old macro 238 which was used prior to the standard acceptance. This macro will 239 eventually go away and the features enabled by default once the ISO C99 240 standard is widely adopted. */ 241#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \ 242 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) 243# define __USE_ISOC99 1 244#endif 245 246/* This is to enable the ISO C90 Amendment 1:1995 extension. */ 247#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \ 248 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L)) 249# define __USE_ISOC95 1 250#endif 251 252/* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2 253 (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */ 254#if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \ 255 !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE) 256# define _POSIX_SOURCE 1 257# if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500 258# define _POSIX_C_SOURCE 2 259# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600 260# define _POSIX_C_SOURCE 199506L 261# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700 262# define _POSIX_C_SOURCE 200112L 263# else 264# define _POSIX_C_SOURCE 200809L 265# endif 266# define __USE_POSIX_IMPLICITLY 1 267#endif 268 269#if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE 270# define __USE_POSIX 1 271#endif 272 273#if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE 274# define __USE_POSIX2 1 275#endif 276 277#if (_POSIX_C_SOURCE - 0) >= 199309L 278# define __USE_POSIX199309 1 279#endif 280 281#if (_POSIX_C_SOURCE - 0) >= 199506L 282# define __USE_POSIX199506 1 283#endif 284 285#if (_POSIX_C_SOURCE - 0) >= 200112L 286# define __USE_XOPEN2K 1 287# undef __USE_ISOC99 288# define __USE_ISOC99 1 289#endif 290 291#if (_POSIX_C_SOURCE - 0) >= 200809L 292# define __USE_XOPEN2K8 1 293# undef _ATFILE_SOURCE 294# define _ATFILE_SOURCE 1 295#endif 296 297#ifdef _XOPEN_SOURCE 298# define __USE_XOPEN 1 299# if (_XOPEN_SOURCE - 0) >= 500 300# define __USE_XOPEN_EXTENDED 1 301# define __USE_UNIX98 1 302# undef _LARGEFILE_SOURCE 303# define _LARGEFILE_SOURCE 1 304# if (_XOPEN_SOURCE - 0) >= 600 305# if (_XOPEN_SOURCE - 0) >= 700 306# define __USE_XOPEN2K8 1 307# endif 308# define __USE_XOPEN2K 1 309# undef __USE_ISOC99 310# define __USE_ISOC99 1 311# endif 312# else 313# ifdef _XOPEN_SOURCE_EXTENDED 314# define __USE_XOPEN_EXTENDED 1 315# endif 316# endif 317#endif 318 319#ifdef _LARGEFILE_SOURCE 320# define __USE_LARGEFILE 1 321#endif 322 323#ifdef _LARGEFILE64_SOURCE 324# define __USE_LARGEFILE64 1 325#endif 326 327#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 328# define __USE_FILE_OFFSET64 1 329#endif 330 331#if defined _BSD_SOURCE || defined _SVID_SOURCE 332# define __USE_MISC 1 333#endif 334 335#ifdef _BSD_SOURCE 336# define __USE_BSD 1 337#endif 338 339#ifdef _SVID_SOURCE 340# define __USE_SVID 1 341#endif 342 343#ifdef _ATFILE_SOURCE 344# define __USE_ATFILE 1 345#endif 346 347#ifdef _GNU_SOURCE 348# define __USE_GNU 1 349#endif 350 351#if defined _REENTRANT || defined _THREAD_SAFE 352# define __USE_REENTRANT 1 353#endif 354 355#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \ 356 && __GNUC_PREREQ (4, 1) && defined __OPTIMIZE__ && __OPTIMIZE__ > 0 357# if _FORTIFY_SOURCE > 1 358# define __USE_FORTIFY_LEVEL 2 359# else 360# define __USE_FORTIFY_LEVEL 1 361# endif 362#else 363# define __USE_FORTIFY_LEVEL 0 364#endif 365 366/* We do support the IEC 559 math functionality, real and complex. */ 367#ifdef __UCLIBC_HAS_FLOATS__ 368#define __STDC_IEC_559__ 1 369#define __STDC_IEC_559_COMPLEX__ 1 370#endif 371 372#ifdef __UCLIBC_HAS_WCHAR__ 373/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */ 374#define __STDC_ISO_10646__ 200009L 375#endif 376 377/* There is an unwholesomely huge amount of code out there that depends on the 378 * presence of GNU libc header files. We have GNU libc header files. So here 379 * we commit a horrible sin. At this point, we _lie_ and claim to be GNU libc 380 * to make things like /usr/include/linux/socket.h and lots of apps work as 381 * their developers intended. This is IMHO, pardonable, since these defines 382 * are not really intended to check for the presence of a particular library, 383 * but rather are used to define an _interface_. */ 384#if !defined __FORCE_NOGLIBC && (!defined _LIBC || defined __FORCE_GLIBC) 385/* This macro indicates that the installed library is the GNU C Library. 386 For historic reasons the value now is 6 and this will stay from now 387 on. The use of this variable is deprecated. */ 388/* uClibc WARNING: leave these aligned to the left, don't put a space after '#', else 389 * broken apps could fail the check. */ 390#undef __GNU_LIBRARY__ 391#define __GNU_LIBRARY__ 6 392 393/* Major and minor version number of the GNU C library package. Use 394 these macros to test for features in specific releases. */ 395/* Don't do it, if you want to keep uClibc happy. */ 396#define __GLIBC__ 2 397#define __GLIBC_MINOR__ 2 398#endif 399 400#define __GLIBC_PREREQ(maj, min) \ 401 ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) 402 403#ifndef __UCLIBC__ 404/* Decide whether a compiler supports the long long datatypes. */ 405#if defined __GNUC__ \ 406 || (defined __PGI && defined __i386__ ) \ 407 || (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \ 408 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) 409# define __GLIBC_HAVE_LONG_LONG 1 410#endif 411#endif 412 413/* This is here only because every header file already includes this one. */ 414#ifndef __ASSEMBLER__ 415# ifndef _SYS_CDEFS_H 416# include <sys/cdefs.h> 417# endif 418 419/* If we don't have __REDIRECT, prototypes will be missing if 420 __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */ 421# if defined __USE_FILE_OFFSET64 && !defined __REDIRECT 422# define __USE_LARGEFILE 1 423# ifdef __UCLIBC_HAS_LFS__ 424# define __USE_LARGEFILE64 1 425# endif 426# endif 427 428#endif /* !ASSEMBLER */ 429 430/* Decide whether we can, and are willing to define extern inline 431 * functions in headers, even if this results in a slightly bigger 432 * code for user programs built against uclibc. 433 * Enabled only in -O2 compiles, not -Os. 434 * uclibc itself is usually built without __USE_EXTERN_INLINES, 435 * remove "&& !defined __OPTIMIZE_SIZE__" part to do otherwise. 436 */ 437#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ 438 && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \ 439 && (defined __extern_inline || defined __GNUC_GNU_INLINE__ || defined __GNUC_STDC_INLINE__) 440# define __USE_EXTERN_INLINES 1 441#endif 442 443 444#endif /* features.h */ 445