| 1 | /* features.h,v 1.8 2004/09/14 22:27:32 bird Exp */
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| 2 | /** @file
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| 3 | * GLIBC v2.3.2
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| 4 | * @changed bird: don't define *LARGEFILE64*, but make sure to indicate that
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| 5 | * off_t is 64bits.
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| 6 | * @changed bird: not GLIBC version numbers.
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| 7 | * @changed bird: _GNU_SOURCE should not set _POSIX_SOURCE or _POSIX_C_SOURCE as that
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| 8 | * means somewhat imporatant exclusions in EMX and BSD style headers.
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| 9 | * Some of this have been fixed by __USE_EMX/_EMX_SOURCE, but that's
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| 10 | * not gonna help enough.
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| 11 | * @changed bird: Check if stuff is defined before accessing it in #if. Stops -Wundef
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| 12 | * from bitching.
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| 13 | * @changed bird: don't test on __EMX__ - RC & mozilla.
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| 14 | */
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| 15 |
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| 16 | /* Copyright (C) 1991-1993,1995-2000,2001,2002 Free Software Foundation, Inc.
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| 17 | This file is part of the GNU C Library.
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| 18 |
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| 19 | The GNU C Library is free software; you can redistribute it and/or
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| 20 | modify it under the terms of the GNU Lesser General Public
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| 21 | License as published by the Free Software Foundation; either
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| 22 | version 2.1 of the License, or (at your option) any later version.
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| 23 |
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| 24 | The GNU C Library is distributed in the hope that it will be useful,
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| 25 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 26 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 27 | Lesser General Public License for more details.
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| 28 |
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| 29 | You should have received a copy of the GNU Lesser General Public
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| 30 | License along with the GNU C Library; if not, write to the Free
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| 31 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 32 | 02111-1307 USA. */
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| 33 |
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| 34 | #ifndef _FEATURES_H
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| 35 | #define _FEATURES_H 1
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| 36 |
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| 37 | /* These are defined by the user (or the compiler)
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| 38 | to specify the desired environment:
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| 39 |
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| 40 | __STRICT_ANSI__ ISO Standard C.
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| 41 | _ISOC99_SOURCE Extensions to ISO C89 from ISO C99.
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| 42 | _POSIX_SOURCE IEEE Std 1003.1.
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| 43 | _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
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| 44 | if >=199309L, add IEEE Std 1003.1b-1993;
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| 45 | if >=199506L, add IEEE Std 1003.1c-1995;
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| 46 | if >=200112L, all of IEEE 1003.1-2004
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| 47 | _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
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| 48 | Single Unix conformance is wanted, to 600 for the
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| 49 | upcoming sixth revision.
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| 50 | _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
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| 51 | _LARGEFILE_SOURCE Some more functions for correct standard I/O.
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| 52 | _LARGEFILE64_SOURCE Additional functionality from LFS for large files.
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| 53 | _FILE_OFFSET_BITS=N Select default filesystem interface.
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| 54 | _BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
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| 55 | _SVID_SOURCE ISO C, POSIX, and SVID things.
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| 56 | _GNU_SOURCE All of the above, plus GNU extensions.
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| 57 | _REENTRANT Select additionally reentrant object.
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| 58 | _THREAD_SAFE Same as _REENTRANT, often used by other systems.
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| 59 | _FORTIFY_SOURCE If set to numeric value > 0 additional security
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| 60 | measures are defined, according to level.
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| 61 |
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| 62 | The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
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| 63 | If none of these are defined, the default is to have _SVID_SOURCE,
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| 64 | _BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
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| 65 | 199506L. If more than one of these are defined, they accumulate.
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| 66 | For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
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| 67 | together give you ISO C, 1003.1, and 1003.2, but nothing else.
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| 68 |
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| 69 | These are defined by this file and are used by the
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| 70 | header files to decide what to declare or define:
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| 71 |
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| 72 | __USE_ISOC99 Define ISO C99 things.
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| 73 | __USE_POSIX Define IEEE Std 1003.1 things.
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| 74 | __USE_POSIX2 Define IEEE Std 1003.2 things.
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| 75 | __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
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| 76 | __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
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| 77 | __USE_XOPEN Define XPG things.
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| 78 | __USE_XOPEN_EXTENDED Define X/Open Unix things.
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| 79 | __USE_UNIX98 Define Single Unix V2 things.
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| 80 | __USE_XOPEN2K Define XPG6 things.
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| 81 | __USE_LARGEFILE Define correct standard I/O things.
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| 82 | __USE_LARGEFILE64 Define LFS things with separate names.
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| 83 | __USE_FILE_OFFSET64 Define 64bit interface as default.
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| 84 | __USE_BSD Define 4.3BSD things.
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| 85 | __USE_SVID Define SVID things.
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| 86 | __USE_MISC Define things common to BSD and System V Unix.
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| 87 | __USE_GNU Define GNU extensions.
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| 88 | __USE_REENTRANT Define reentrant/thread-safe *_r functions.
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| 89 | __USE_FORTIFY_LEVEL Additional security measures used, according to level.
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| 90 | __FAVOR_BSD Favor 4.3BSD things in cases of conflict.
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| 91 |
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| 92 | The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
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| 93 | defined by this file unconditionally. `__GNU_LIBRARY__' is provided
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| 94 | only for compatibility. All new code should use the other symbols
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| 95 | to test for features.
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| 96 |
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| 97 | All macros listed above as possibly being defined by this file are
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| 98 | explicitly undefined if they are not explicitly defined.
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| 99 | Feature-test macros that are not defined by the user or compiler
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| 100 | but are implied by the other feature-test macros defined (or by the
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| 101 | lack of any definitions) are defined by the file. */
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| 102 |
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| 103 |
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| 104 | /* Undefine everything, so we get a clean slate. */
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| 105 | #undef __USE_ISOC99
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| 106 | #undef __USE_POSIX
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| 107 | #undef __USE_POSIX2
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| 108 | #undef __USE_POSIX199309
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| 109 | #undef __USE_POSIX199506
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| 110 | #undef __USE_XOPEN
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| 111 | #undef __USE_XOPEN_EXTENDED
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| 112 | #undef __USE_UNIX98
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| 113 | #undef __USE_XOPEN2K
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| 114 | #undef __USE_LARGEFILE
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| 115 | #undef __USE_LARGEFILE64
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| 116 | #undef __USE_FILE_OFFSET64
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| 117 | #undef __USE_BSD
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| 118 | #undef __USE_SVID
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| 119 | #undef __USE_MISC
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| 120 | #undef __USE_GNU
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| 121 | #undef __USE_REENTRANT
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| 122 | #undef __USE_FORTIFY_LEVEL
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| 123 | #undef __FAVOR_BSD
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| 124 | #undef __KERNEL_STRICT_NAMES
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| 125 | #undef __USE_EMX /* bird */
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| 126 |
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| 127 | /* Suppress kernel-name space pollution unless user expressedly asks
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| 128 | for it. */
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| 129 | #ifndef _LOOSE_KERNEL_NAMES
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| 130 | # define __KERNEL_STRICT_NAMES
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| 131 | #endif
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| 132 |
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| 133 | /* Always use ISO C things. */
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| 134 | #define __USE_ANSI 1
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| 135 |
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| 136 | /* Convenience macros to test the versions of glibc and gcc.
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| 137 | Use them like this:
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| 138 | #if __GNUC_PREREQ (2,8)
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| 139 | ... code requiring gcc 2.8 or later ...
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| 140 | #endif
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| 141 | Note - they won't work for gcc1 or glibc1, since the _MINOR macros
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| 142 | were not defined then. */
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| 143 | #if defined __GNUC__ && defined __GNUC_MINOR__
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| 144 | # define __GNUC_PREREQ(maj, min) \
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| 145 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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| 146 | #else
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| 147 | # define __GNUC_PREREQ(maj, min) 0
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| 148 | #endif
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| 149 |
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| 150 |
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| 151 | /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
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| 152 | #if defined _BSD_SOURCE && \
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| 153 | !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
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| 154 | defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
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| 155 | defined _GNU_SOURCE || defined _SVID_SOURCE)
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| 156 | # define __FAVOR_BSD 1
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| 157 | #endif
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| 158 |
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| 159 | /* If _GNU_SOURCE was defined by the user, turn on all the other features. */
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| 160 | #ifdef _GNU_SOURCE
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| 161 | # undef _ISOC99_SOURCE
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| 162 | # define _ISOC99_SOURCE 1
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| 163 | /* bird: sorry, but this isn't causing huge exclusions for BSD or EMX headers. */
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| 164 | #if 0 /*ndef __EMX__*/ /* bird */
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| 165 | # undef _POSIX_SOURCE
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| 166 | # define _POSIX_SOURCE 1
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| 167 | # undef _POSIX_C_SOURCE
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| 168 | # define _POSIX_C_SOURCE 199506L
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| 169 | #else /* bird */
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| 170 | # define __USE_POSIX199309 1 /* bird */
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| 171 | # define __USE_POSIX199506 1 /* bird */
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| 172 | #endif /* bird */
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| 173 | # undef _XOPEN_SOURCE
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| 174 | # define _XOPEN_SOURCE 600
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| 175 | # undef _XOPEN_SOURCE_EXTENDED
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| 176 | # define _XOPEN_SOURCE_EXTENDED 1
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| 177 | # undef _LARGEFILE64_SOURCE
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| 178 | #if 0 /*def __EMX__*/ /* bird */
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| 179 | # define _LARGEFILE64_SOURCE 1
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| 180 | #endif /* bird */
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| 181 | # undef _BSD_SOURCE
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| 182 | # define _BSD_SOURCE 1
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| 183 | # undef _SVID_SOURCE
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| 184 | # define _SVID_SOURCE 1
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| 185 | # if 1 /*def __EMX__ */ /* bird */
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| 186 | # define _EMX_SOURCE 1 /* bird */
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| 187 | # endif /* bird */
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| 188 | # endif
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| 189 |
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| 190 | /* If nothing (other than _GNU_SOURCE) is defined,
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| 191 | define _BSD_SOURCE and _SVID_SOURCE. */
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| 192 | #if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \
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| 193 | !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
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| 194 | !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
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| 195 | !defined _BSD_SOURCE && !defined _SVID_SOURCE)
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| 196 | # define _BSD_SOURCE 1
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| 197 | # define _SVID_SOURCE 1
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| 198 | #endif
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| 199 |
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| 200 | /* This is to enable the ISO C99 extension. Also recognize the old macro
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| 201 | which was used prior to the standard acceptance. This macro will
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| 202 | eventually go away and the features enabled by default once the ISO C99
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| 203 | standard is widely adopted. */
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| 204 | #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
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| 205 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
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| 206 | # define __USE_ISOC99 1
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| 207 | #endif
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| 208 |
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| 209 | #if 0 /*ndef __EMX__*/ /* bird: this messes up lot's of EMX legacy declarations. */
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| 210 | /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
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| 211 | (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
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| 212 | #if (!defined __STRICT_ANSI__ && !defined _POSIX_SOURCE && \
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| 213 | !defined _POSIX_C_SOURCE)
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| 214 | # define _POSIX_SOURCE 1
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| 215 | # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
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| 216 | # define _POSIX_C_SOURCE 2
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| 217 | # else
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| 218 | # define _POSIX_C_SOURCE 199506L
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| 219 | # endif
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| 220 | #endif
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| 221 | #endif /* bird */
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| 222 |
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| 223 | #if defined _POSIX_SOURCE || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1) || defined _XOPEN_SOURCE /* bird: check if defined, -Wundef. */
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| 224 | # define __USE_POSIX 1
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| 225 | #endif
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| 226 |
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| 227 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
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| 228 | # define __USE_POSIX2 1
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| 229 | #endif
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| 230 |
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| 231 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199309L /* bird: check if defined, -Wundef. */
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| 232 | # define __USE_POSIX199309 1
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| 233 | #endif
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| 234 |
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| 235 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L /* bird: check if defined, -Wundef. */
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| 236 | # define __USE_POSIX199506 1
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| 237 | #endif
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| 238 |
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| 239 |
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| 240 | #if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L /* bird: check if defined, -Wundef. */
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| 241 | # define __USE_XOPEN2K 1
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| 242 | #endif
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| 243 |
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| 244 | #ifdef _XOPEN_SOURCE
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| 245 | # define __USE_XOPEN 1
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| 246 | # if (_XOPEN_SOURCE - 0) >= 500
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| 247 | # define __USE_XOPEN_EXTENDED 1
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| 248 | # define __USE_UNIX98 1
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| 249 | # undef _LARGEFILE_SOURCE
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| 250 | # define _LARGEFILE_SOURCE 1
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| 251 | # if (_XOPEN_SOURCE - 0) >= 600
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| 252 | # define __USE_XOPEN2K 1
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| 253 | # undef __USE_ISOC99
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| 254 | # define __USE_ISOC99 1
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| 255 | # endif
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| 256 | # else
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| 257 | # ifdef _XOPEN_SOURCE_EXTENDED
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| 258 | # define __USE_XOPEN_EXTENDED 1
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| 259 | # endif
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| 260 | # endif
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| 261 | #endif
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| 262 |
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| 263 | #ifdef _LARGEFILE_SOURCE
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| 264 | # define __USE_LARGEFILE 1
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| 265 | #endif
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| 266 |
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| 267 | #if 0 /*ndef __EMX__*/ /* bird */
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| 268 | #ifdef _LARGEFILE64_SOURCE
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| 269 | # define __USE_LARGEFILE64 1
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| 270 | #endif
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| 271 | #endif /* bird */
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| 272 |
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| 273 | #if 0 /*ndef __EMX__*/ /* bird */
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| 274 | #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
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| 275 | # define __USE_FILE_OFFSET64 1
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| 276 | #endif
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| 277 | #else
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| 278 | # define __USE_FILE_OFFSET64 1
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| 279 | #endif /* bird */
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| 280 |
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| 281 | #if defined _BSD_SOURCE || defined _SVID_SOURCE
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| 282 | # define __USE_MISC 1
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| 283 | #endif
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| 284 |
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| 285 | #ifdef _BSD_SOURCE
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| 286 | # define __USE_BSD 1
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| 287 | /* bird: __USE_BSD == __BSD_VISIBLE, make sure it's defined. */
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| 288 | # undef __BSD_VISIBLE
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| 289 | # define __BSD_VISIBLE 1
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| 290 | /* bird: end */
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| 291 | #endif
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| 292 |
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| 293 | #ifdef _SVID_SOURCE
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| 294 | # define __USE_SVID 1
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| 295 | #endif
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| 296 |
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| 297 | #ifdef _GNU_SOURCE
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| 298 | # define __USE_GNU 1
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| 299 | #endif
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| 300 |
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| 301 | #if defined(_EMX_SOURCE) /* bird */
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| 302 | # define __USE_EMX 1 /* bird */
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| 303 | #endif /* bird */
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| 304 |
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| 305 | #if defined _REENTRANT || defined _THREAD_SAFE
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| 306 | # define __USE_REENTRANT 1
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| 307 | #endif
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| 308 |
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| 309 | #if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && __GNUC_PREREQ (4, 1) && defined (__OPTIMIZE__) && __OPTIMIZE__ > 0 /* bird: check if defined, -Wundef. */
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| 310 | # if _FORTIFY_SOURCE == 1
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| 311 | # define __USE_FORTIFY_LEVEL 1
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| 312 | # elif _FORTIFY_SOURCE > 1
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| 313 | # define __USE_FORTIFY_LEVEL 2
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| 314 | # endif
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| 315 | #endif
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| 316 |
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| 317 | /* We do support the IEC 559 math functionality, real and complex. */
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| 318 | #define __STDC_IEC_559__ 1
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| 319 | #define __STDC_IEC_559_COMPLEX__ 1
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| 320 |
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| 321 | /* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */
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| 322 | #define __STDC_ISO_10646__ 200009L
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| 323 |
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| 324 | #if 0 /*ndef __EMX__*/ /*bird: we're not GLIBC */
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| 325 | /* This macro indicates that the installed library is the GNU C Library.
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| 326 | For historic reasons the value now is 6 and this will stay from now
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| 327 | on. The use of this variable is deprecated. Use __GLIBC__ and
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| 328 | __GLIBC_MINOR__ now (see below) when you want to test for a specific
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| 329 | GNU C library version and use the values in <gnu/lib-names.h> to get
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| 330 | the sonames of the shared libraries. */
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| 331 | #undef __GNU_LIBRARY__
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| 332 | #define __GNU_LIBRARY__ 6
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| 333 |
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| 334 | /* Major and minor version number of the GNU C library package. Use
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| 335 | these macros to test for features in specific releases. */
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| 336 | #define __GLIBC__ 2
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| 337 | #define __GLIBC_MINOR__ 4
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| 338 | #endif /*bird*/
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| 339 |
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| 340 | #define __GLIBC_PREREQ(maj, min) \
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| 341 | ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
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| 342 |
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| 343 | /* Decide whether a compiler supports the long long datatypes. */
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| 344 | #if defined __GNUC__ \
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| 345 | || (defined __PGI && defined __i386__ ) \
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| 346 | || (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \
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| 347 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
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| 348 | # define __GLIBC_HAVE_LONG_LONG 1
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| 349 | #endif
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| 350 |
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| 351 | /* This is here only because every header file already includes this one. */
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| 352 | #ifndef __ASSEMBLER__
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| 353 | # ifndef _SYS_CDEFS_H
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| 354 | # include <sys/cdefs.h>
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| 355 | # endif
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| 356 |
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| 357 | /* If we don't have __REDIRECT, prototypes will be missing if
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| 358 | __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
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| 359 | # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
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| 360 | # define __USE_LARGEFILE 1
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| 361 | #if 0 /*ndef __EMX__*/ /* bird */
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| 362 | # define __USE_LARGEFILE64 1
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| 363 | #endif /* bird */
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| 364 | # endif
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| 365 |
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| 366 | #endif /* !ASSEMBLER */
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| 367 |
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| 368 | /* Decide whether we can define 'extern inline' functions in headers. */
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| 369 | #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
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| 370 | && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__
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| 371 | # define __USE_EXTERN_INLINES 1
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| 372 | #endif
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| 373 |
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| 374 |
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| 375 | #if 0 /*ndef __EMX__*/ /* bird */
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| 376 | /* This is here only because every header file already includes this one.
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| 377 | Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
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| 378 | <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
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| 379 | that will always return failure (and set errno to ENOSYS). */
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| 380 | #include <gnu/stubs.h>
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| 381 | #endif /* bird */
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| 382 |
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| 383 |
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| 384 | #endif /* features.h */
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