| 1 | /* Copyright (C) 1991-1993,1995-2000,2001,2002 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 | _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
|
|---|
| 32 | Single Unix conformance is wanted, to 600 for the
|
|---|
| 33 | upcoming sixth revision.
|
|---|
| 34 | _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
|
|---|
| 35 | _LARGEFILE_SOURCE Some more functions for correct standard I/O.
|
|---|
| 36 | _LARGEFILE64_SOURCE Additional functionality from LFS for large files.
|
|---|
| 37 | _FILE_OFFSET_BITS=N Select default filesystem interface.
|
|---|
| 38 | _BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
|
|---|
| 39 | _SVID_SOURCE ISO C, POSIX, and SVID things.
|
|---|
| 40 | _GNU_SOURCE All of the above, plus GNU extensions.
|
|---|
| 41 | _REENTRANT Select additionally reentrant object.
|
|---|
| 42 | _THREAD_SAFE Same as _REENTRANT, often used by other systems.
|
|---|
| 43 |
|
|---|
| 44 | The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
|
|---|
| 45 | If none of these are defined, the default is to have _SVID_SOURCE,
|
|---|
| 46 | _BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
|
|---|
| 47 | 199506L. If more than one of these are defined, they accumulate.
|
|---|
| 48 | For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
|
|---|
| 49 | together give you ISO C, 1003.1, and 1003.2, but nothing else.
|
|---|
| 50 |
|
|---|
| 51 | These are defined by this file and are used by the
|
|---|
| 52 | header files to decide what to declare or define:
|
|---|
| 53 |
|
|---|
| 54 | __USE_ISOC99 Define ISO C99 things.
|
|---|
| 55 | __USE_POSIX Define IEEE Std 1003.1 things.
|
|---|
| 56 | __USE_POSIX2 Define IEEE Std 1003.2 things.
|
|---|
| 57 | __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
|
|---|
| 58 | __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
|
|---|
| 59 | __USE_XOPEN Define XPG things.
|
|---|
| 60 | __USE_XOPEN_EXTENDED Define X/Open Unix things.
|
|---|
| 61 | __USE_UNIX98 Define Single Unix V2 things.
|
|---|
| 62 | __USE_XOPEN2K Define XPG6 things.
|
|---|
| 63 | __USE_LARGEFILE Define correct standard I/O things.
|
|---|
| 64 | __USE_LARGEFILE64 Define LFS things with separate names.
|
|---|
| 65 | __USE_FILE_OFFSET64 Define 64bit interface as default.
|
|---|
| 66 | __USE_BSD Define 4.3BSD things.
|
|---|
| 67 | __USE_SVID Define SVID things.
|
|---|
| 68 | __USE_MISC Define things common to BSD and System V Unix.
|
|---|
| 69 | __USE_GNU Define GNU extensions.
|
|---|
| 70 | __USE_REENTRANT Define reentrant/thread-safe *_r functions.
|
|---|
| 71 | __FAVOR_BSD Favor 4.3BSD things in cases of conflict.
|
|---|
| 72 |
|
|---|
| 73 | The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
|
|---|
| 74 | defined by this file unconditionally. `__GNU_LIBRARY__' is provided
|
|---|
| 75 | only for compatibility. All new code should use the other symbols
|
|---|
| 76 | to test for features.
|
|---|
| 77 |
|
|---|
| 78 | All macros listed above as possibly being defined by this file are
|
|---|
| 79 | explicitly undefined if they are not explicitly defined.
|
|---|
| 80 | Feature-test macros that are not defined by the user or compiler
|
|---|
| 81 | but are implied by the other feature-test macros defined (or by the
|
|---|
| 82 | lack of any definitions) are defined by the file. */
|
|---|
| 83 |
|
|---|
| 84 |
|
|---|
| 85 | /* Undefine everything, so we get a clean slate. */
|
|---|
| 86 | #undef __USE_ISOC99
|
|---|
| 87 | #undef __USE_POSIX
|
|---|
| 88 | #undef __USE_POSIX2
|
|---|
| 89 | #undef __USE_POSIX199309
|
|---|
| 90 | #undef __USE_POSIX199506
|
|---|
| 91 | #undef __USE_XOPEN
|
|---|
| 92 | #undef __USE_XOPEN_EXTENDED
|
|---|
| 93 | #undef __USE_UNIX98
|
|---|
| 94 | #undef __USE_XOPEN2K
|
|---|
| 95 | #undef __USE_LARGEFILE
|
|---|
| 96 | #undef __USE_LARGEFILE64
|
|---|
| 97 | #undef __USE_FILE_OFFSET64
|
|---|
| 98 | #undef __USE_BSD
|
|---|
| 99 | #undef __USE_SVID
|
|---|
| 100 | #undef __USE_MISC
|
|---|
| 101 | #undef __USE_GNU
|
|---|
| 102 | #undef __USE_REENTRANT
|
|---|
| 103 | #undef __FAVOR_BSD
|
|---|
| 104 | #undef __KERNEL_STRICT_NAMES
|
|---|
| 105 |
|
|---|
| 106 | /* Suppress kernel-name space pollution unless user expressedly asks
|
|---|
| 107 | for it. */
|
|---|
| 108 | #ifndef _LOOSE_KERNEL_NAMES
|
|---|
| 109 | # define __KERNEL_STRICT_NAMES
|
|---|
| 110 | #endif
|
|---|
| 111 |
|
|---|
| 112 | /* Always use ISO C things. */
|
|---|
| 113 | #define __USE_ANSI 1
|
|---|
| 114 |
|
|---|
| 115 |
|
|---|
| 116 | /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
|
|---|
| 117 | #if defined _BSD_SOURCE && \
|
|---|
| 118 | !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
|
|---|
| 119 | defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
|
|---|
| 120 | defined _GNU_SOURCE || defined _SVID_SOURCE)
|
|---|
| 121 | # define __FAVOR_BSD 1
|
|---|
| 122 | #endif
|
|---|
| 123 |
|
|---|
| 124 | /* If _GNU_SOURCE was defined by the user, turn on all the other features. */
|
|---|
| 125 | #ifdef _GNU_SOURCE
|
|---|
| 126 | # undef _ISOC99_SOURCE
|
|---|
| 127 | # define _ISOC99_SOURCE 1
|
|---|
| 128 | # undef _POSIX_SOURCE
|
|---|
| 129 | # define _POSIX_SOURCE 1
|
|---|
| 130 | # undef _POSIX_C_SOURCE
|
|---|
| 131 | # define _POSIX_C_SOURCE 199506L
|
|---|
| 132 | # undef _XOPEN_SOURCE
|
|---|
| 133 | # define _XOPEN_SOURCE 600
|
|---|
| 134 | # undef _XOPEN_SOURCE_EXTENDED
|
|---|
| 135 | # define _XOPEN_SOURCE_EXTENDED 1
|
|---|
| 136 | # undef _LARGEFILE64_SOURCE
|
|---|
| 137 | # define _LARGEFILE64_SOURCE 1
|
|---|
| 138 | # undef _BSD_SOURCE
|
|---|
| 139 | # define _BSD_SOURCE 1
|
|---|
| 140 | # undef _SVID_SOURCE
|
|---|
| 141 | # define _SVID_SOURCE 1
|
|---|
| 142 | #endif
|
|---|
| 143 |
|
|---|
| 144 | /* If nothing (other than _GNU_SOURCE) is defined,
|
|---|
| 145 | define _BSD_SOURCE and _SVID_SOURCE. */
|
|---|
| 146 | #if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \
|
|---|
| 147 | !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
|
|---|
| 148 | !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
|
|---|
| 149 | !defined _BSD_SOURCE && !defined _SVID_SOURCE)
|
|---|
| 150 | # define _BSD_SOURCE 1
|
|---|
| 151 | # define _SVID_SOURCE 1
|
|---|
| 152 | #endif
|
|---|
| 153 |
|
|---|
| 154 | /* This is to enable the ISO C99 extension. Also recognize the old macro
|
|---|
| 155 | which was used prior to the standard acceptance. This macro will
|
|---|
| 156 | eventually go away and the features enabled by default once the ISO C99
|
|---|
| 157 | standard is widely adopted. */
|
|---|
| 158 | #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
|
|---|
| 159 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
|
|---|
| 160 | # define __USE_ISOC99 1
|
|---|
| 161 | #endif
|
|---|
| 162 |
|
|---|
| 163 | /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
|
|---|
| 164 | (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
|
|---|
| 165 | #if (!defined __STRICT_ANSI__ && !defined _POSIX_SOURCE && \
|
|---|
| 166 | !defined _POSIX_C_SOURCE)
|
|---|
| 167 | # define _POSIX_SOURCE 1
|
|---|
| 168 | # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
|
|---|
| 169 | # define _POSIX_C_SOURCE 2
|
|---|
| 170 | # else
|
|---|
| 171 | # define _POSIX_C_SOURCE 199506L
|
|---|
| 172 | # endif
|
|---|
| 173 | #endif
|
|---|
| 174 |
|
|---|
| 175 | #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
|
|---|
| 176 | # define __USE_POSIX 1
|
|---|
| 177 | #endif
|
|---|
| 178 |
|
|---|
| 179 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
|
|---|
| 180 | # define __USE_POSIX2 1
|
|---|
| 181 | #endif
|
|---|
| 182 |
|
|---|
| 183 | #if (_POSIX_C_SOURCE - 0) >= 199309L
|
|---|
| 184 | # define __USE_POSIX199309 1
|
|---|
| 185 | #endif
|
|---|
| 186 |
|
|---|
| 187 | #if (_POSIX_C_SOURCE - 0) >= 199506L
|
|---|
| 188 | # define __USE_POSIX199506 1
|
|---|
| 189 | #endif
|
|---|
| 190 |
|
|---|
| 191 | #ifdef _XOPEN_SOURCE
|
|---|
| 192 | # define __USE_XOPEN 1
|
|---|
| 193 | # if (_XOPEN_SOURCE - 0) >= 500
|
|---|
| 194 | # define __USE_XOPEN_EXTENDED 1
|
|---|
| 195 | # define __USE_UNIX98 1
|
|---|
| 196 | # undef _LARGEFILE_SOURCE
|
|---|
| 197 | # define _LARGEFILE_SOURCE 1
|
|---|
| 198 | # if (_XOPEN_SOURCE - 0) >= 600
|
|---|
| 199 | # define __USE_XOPEN2K 1
|
|---|
| 200 | # undef __USE_ISOC99
|
|---|
| 201 | # define __USE_ISOC99 1
|
|---|
| 202 | # endif
|
|---|
| 203 | # else
|
|---|
| 204 | # ifdef _XOPEN_SOURCE_EXTENDED
|
|---|
| 205 | # define __USE_XOPEN_EXTENDED 1
|
|---|
| 206 | # endif
|
|---|
| 207 | # endif
|
|---|
| 208 | #endif
|
|---|
| 209 |
|
|---|
| 210 | #ifdef _LARGEFILE_SOURCE
|
|---|
| 211 | # define __USE_LARGEFILE 1
|
|---|
| 212 | #endif
|
|---|
| 213 |
|
|---|
| 214 | #ifdef _LARGEFILE64_SOURCE
|
|---|
| 215 | # define __USE_LARGEFILE64 1
|
|---|
| 216 | #endif
|
|---|
| 217 |
|
|---|
| 218 | #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
|
|---|
| 219 | # define __USE_FILE_OFFSET64 1
|
|---|
| 220 | #endif
|
|---|
| 221 |
|
|---|
| 222 | #if defined _BSD_SOURCE || defined _SVID_SOURCE
|
|---|
| 223 | # define __USE_MISC 1
|
|---|
| 224 | #endif
|
|---|
| 225 |
|
|---|
| 226 | #ifdef _BSD_SOURCE
|
|---|
| 227 | # define __USE_BSD 1
|
|---|
| 228 | #endif
|
|---|
| 229 |
|
|---|
| 230 | #ifdef _SVID_SOURCE
|
|---|
| 231 | # define __USE_SVID 1
|
|---|
| 232 | #endif
|
|---|
| 233 |
|
|---|
| 234 | #ifdef _GNU_SOURCE
|
|---|
| 235 | # define __USE_GNU 1
|
|---|
| 236 | #endif
|
|---|
| 237 |
|
|---|
| 238 | #if defined _REENTRANT || defined _THREAD_SAFE
|
|---|
| 239 | # define __USE_REENTRANT 1
|
|---|
| 240 | #endif
|
|---|
| 241 |
|
|---|
| 242 | /* We do support the IEC 559 math functionality, real and complex. */
|
|---|
| 243 | #define __STDC_IEC_559__ 1
|
|---|
| 244 | #define __STDC_IEC_559_COMPLEX__ 1
|
|---|
| 245 |
|
|---|
| 246 | /* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */
|
|---|
| 247 | #define __STDC_ISO_10646__ 200009L
|
|---|
| 248 |
|
|---|
| 249 | /* This macro indicates that the installed library is the GNU C Library.
|
|---|
| 250 | For historic reasons the value now is 6 and this will stay from now
|
|---|
| 251 | on. The use of this variable is deprecated. Use __GLIBC__ and
|
|---|
| 252 | __GLIBC_MINOR__ now (see below) when you want to test for a specific
|
|---|
| 253 | GNU C library version and use the values in <gnu/lib-names.h> to get
|
|---|
| 254 | the sonames of the shared libraries. */
|
|---|
| 255 | #undef __GNU_LIBRARY__
|
|---|
| 256 | #define __GNU_LIBRARY__ 6
|
|---|
| 257 |
|
|---|
| 258 | /* Major and minor version number of the GNU C library package. Use
|
|---|
| 259 | these macros to test for features in specific releases. */
|
|---|
| 260 | #define __GLIBC__ 2
|
|---|
| 261 | #define __GLIBC_MINOR__ 3
|
|---|
| 262 |
|
|---|
| 263 | /* Convenience macros to test the versions of glibc and gcc.
|
|---|
| 264 | Use them like this:
|
|---|
| 265 | #if __GNUC_PREREQ (2,8)
|
|---|
| 266 | ... code requiring gcc 2.8 or later ...
|
|---|
| 267 | #endif
|
|---|
| 268 | Note - they won't work for gcc1 or glibc1, since the _MINOR macros
|
|---|
| 269 | were not defined then. */
|
|---|
| 270 | #if defined __GNUC__ && defined __GNUC_MINOR__
|
|---|
| 271 | # define __GNUC_PREREQ(maj, min) \
|
|---|
| 272 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
|
|---|
| 273 | #else
|
|---|
| 274 | # define __GNUC_PREREQ(maj, min) 0
|
|---|
| 275 | #endif
|
|---|
| 276 |
|
|---|
| 277 | #define __GLIBC_PREREQ(maj, min) \
|
|---|
| 278 | ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
|
|---|
| 279 |
|
|---|
| 280 | /* Decide whether a compiler supports the long long datatypes. */
|
|---|
| 281 | #if defined __GNUC__ \
|
|---|
| 282 | || (defined __PGI && defined __i386__ ) \
|
|---|
| 283 | || (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \
|
|---|
| 284 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
|
|---|
| 285 | # define __GLIBC_HAVE_LONG_LONG 1
|
|---|
| 286 | #endif
|
|---|
| 287 |
|
|---|
| 288 | /* This is here only because every header file already includes this one. */
|
|---|
| 289 | #ifndef __ASSEMBLER__
|
|---|
| 290 | # ifndef _SYS_CDEFS_H
|
|---|
| 291 | # include <sys/cdefs.h>
|
|---|
| 292 | # endif
|
|---|
| 293 |
|
|---|
| 294 | /* If we don't have __REDIRECT, prototypes will be missing if
|
|---|
| 295 | __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
|
|---|
| 296 | # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
|
|---|
| 297 | # define __USE_LARGEFILE 1
|
|---|
| 298 | # define __USE_LARGEFILE64 1
|
|---|
| 299 | # endif
|
|---|
| 300 |
|
|---|
| 301 | #endif /* !ASSEMBLER */
|
|---|
| 302 |
|
|---|
| 303 | /* Decide whether we can define 'extern inline' functions in headers. */
|
|---|
| 304 | #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
|
|---|
| 305 | && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__
|
|---|
| 306 | # define __USE_EXTERN_INLINES 1
|
|---|
| 307 | #endif
|
|---|
| 308 |
|
|---|
| 309 |
|
|---|
| 310 | /* This is here only because every header file already includes this one.
|
|---|
| 311 | Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
|
|---|
| 312 | <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
|
|---|
| 313 | that will always return failure (and set errno to ENOSYS). */
|
|---|
| 314 | #include <gnu/stubs.h>
|
|---|
| 315 |
|
|---|
| 316 |
|
|---|
| 317 | #endif /* features.h */
|
|---|
