| 1 | /* Copyright (C) 1991-1993,1995-2007,2009,2010 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, write to the Free |
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| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 17 | 02111-1307 USA. */ |
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| 18 | |
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| 19 | #ifndef _FEATURES_H |
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| 20 | #define _FEATURES_H 1 |
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| 21 | |
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| 22 | /* These are defined by the user (or the compiler) |
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| 23 | to specify the desired environment: |
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| 24 | |
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| 25 | __STRICT_ANSI__ ISO Standard C. |
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| 26 | _ISOC99_SOURCE Extensions to ISO C89 from ISO C99. |
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| 27 | _POSIX_SOURCE IEEE Std 1003.1. |
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| 28 | _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2; |
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| 29 | if >=199309L, add IEEE Std 1003.1b-1993; |
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| 30 | if >=199506L, add IEEE Std 1003.1c-1995; |
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| 31 | if >=200112L, all of IEEE 1003.1-2004 |
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| 32 | if >=200809L, all of IEEE 1003.1-2008 |
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| 33 | _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if |
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| 34 | Single Unix conformance is wanted, to 600 for the |
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| 35 | sixth revision, to 700 for the seventh revision. |
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| 36 | _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions. |
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| 37 | _LARGEFILE_SOURCE Some more functions for correct standard I/O. |
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| 38 | _LARGEFILE64_SOURCE Additional functionality from LFS for large files. |
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| 39 | _FILE_OFFSET_BITS=N Select default filesystem interface. |
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| 40 | _BSD_SOURCE ISO C, POSIX, and 4.3BSD things. |
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| 41 | _SVID_SOURCE ISO C, POSIX, and SVID things. |
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| 42 | _ATFILE_SOURCE Additional *at interfaces. |
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| 43 | _GNU_SOURCE All of the above, plus GNU extensions. |
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| 44 | _REENTRANT Select additionally reentrant object. |
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| 45 | _THREAD_SAFE Same as _REENTRANT, often used by other systems. |
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| 46 | _FORTIFY_SOURCE If set to numeric value > 0 additional security |
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| 47 | measures are defined, according to level. |
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| 48 | |
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| 49 | The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__. |
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| 50 | If none of these are defined, the default is to have _SVID_SOURCE, |
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| 51 | _BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to |
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| 52 | 200112L. If more than one of these are defined, they accumulate. |
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| 53 | For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE |
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| 54 | together give you ISO C, 1003.1, and 1003.2, but nothing else. |
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| 55 | |
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| 56 | These are defined by this file and are used by the |
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| 57 | header files to decide what to declare or define: |
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| 58 | |
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| 59 | __USE_ISOC99 Define ISO C99 things. |
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| 60 | __USE_ISOC95 Define ISO C90 AMD1 (C95) things. |
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| 61 | __USE_POSIX Define IEEE Std 1003.1 things. |
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| 62 | __USE_POSIX2 Define IEEE Std 1003.2 things. |
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| 63 | __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things. |
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| 64 | __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things. |
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| 65 | __USE_XOPEN Define XPG things. |
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| 66 | __USE_XOPEN_EXTENDED Define X/Open Unix things. |
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| 67 | __USE_UNIX98 Define Single Unix V2 things. |
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| 68 | __USE_XOPEN2K Define XPG6 things. |
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| 69 | __USE_XOPEN2KXSI Define XPG6 XSI things. |
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| 70 | __USE_XOPEN2K8XSI Define XPG7 XSI things. |
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| 71 | __USE_LARGEFILE Define correct standard I/O things. |
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| 72 | __USE_LARGEFILE64 Define LFS things with separate names. |
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| 73 | __USE_FILE_OFFSET64 Define 64bit interface as default. |
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| 74 | __USE_BSD Define 4.3BSD things. |
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| 75 | __USE_SVID Define SVID things. |
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| 76 | __USE_MISC Define things common to BSD and System V Unix. |
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| 77 | __USE_ATFILE Define *at interfaces and AT_* constants for them. |
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| 78 | __USE_GNU Define GNU extensions. |
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| 79 | __USE_REENTRANT Define reentrant/thread-safe *_r functions. |
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| 80 | __USE_FORTIFY_LEVEL Additional security measures used, according to level. |
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| 81 | __FAVOR_BSD Favor 4.3BSD things in cases of conflict. |
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| 82 | |
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| 83 | The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are |
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| 84 | defined by this file unconditionally. `__GNU_LIBRARY__' is provided |
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| 85 | only for compatibility. All new code should use the other symbols |
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| 86 | to test for features. |
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| 87 | |
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| 88 | All macros listed above as possibly being defined by this file are |
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| 89 | explicitly undefined if they are not explicitly defined. |
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| 90 | Feature-test macros that are not defined by the user or compiler |
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| 91 | but are implied by the other feature-test macros defined (or by the |
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| 92 | lack of any definitions) are defined by the file. */ |
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| 93 | |
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| 94 | |
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| 95 | /* Undefine everything, so we get a clean slate. */ |
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| 96 | #undef __USE_ISOC99 |
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| 97 | #undef __USE_ISOC95 |
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| 98 | #undef __USE_POSIX |
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| 99 | #undef __USE_POSIX2 |
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| 100 | #undef __USE_POSIX199309 |
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| 101 | #undef __USE_POSIX199506 |
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| 102 | #undef __USE_XOPEN |
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| 103 | #undef __USE_XOPEN_EXTENDED |
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| 104 | #undef __USE_UNIX98 |
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| 105 | #undef __USE_XOPEN2K |
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| 106 | #undef __USE_XOPEN2KXSI |
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| 107 | #undef __USE_XOPEN2K8 |
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| 108 | #undef __USE_XOPEN2K8XSI |
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| 109 | #undef __USE_LARGEFILE |
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| 110 | #undef __USE_LARGEFILE64 |
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| 111 | #undef __USE_FILE_OFFSET64 |
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| 112 | #undef __USE_BSD |
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| 113 | #undef __USE_SVID |
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| 114 | #undef __USE_MISC |
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| 115 | #undef __USE_ATFILE |
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| 116 | #undef __USE_GNU |
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| 117 | #undef __USE_REENTRANT |
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| 118 | #undef __USE_FORTIFY_LEVEL |
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| 119 | #undef __FAVOR_BSD |
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| 120 | #undef __KERNEL_STRICT_NAMES |
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| 121 | |
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| 122 | /* Suppress kernel-name space pollution unless user expressedly asks |
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| 123 | for it. */ |
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| 124 | #ifndef _LOOSE_KERNEL_NAMES |
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| 125 | # define __KERNEL_STRICT_NAMES |
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| 126 | #endif |
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| 127 | |
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| 128 | /* Always use ISO C things. */ |
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| 129 | #define __USE_ANSI 1 |
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| 130 | |
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| 131 | /* Convenience macros to test the versions of glibc and gcc. |
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| 132 | Use them like this: |
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| 133 | #if __GNUC_PREREQ (2,8) |
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| 134 | ... code requiring gcc 2.8 or later ... |
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| 135 | #endif |
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| 136 | Note - they won't work for gcc1 or glibc1, since the _MINOR macros |
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| 137 | were not defined then. */ |
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| 138 | #if defined __GNUC__ && defined __GNUC_MINOR__ |
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| 139 | # define __GNUC_PREREQ(maj, min) \ |
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| 140 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) |
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| 141 | #else |
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| 142 | # define __GNUC_PREREQ(maj, min) 0 |
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| 143 | #endif |
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| 144 | |
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| 145 | |
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| 146 | /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */ |
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| 147 | #if defined _BSD_SOURCE && \ |
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| 148 | !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \ |
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| 149 | defined _XOPEN_SOURCE || defined _GNU_SOURCE || defined _SVID_SOURCE) |
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| 150 | # define __FAVOR_BSD 1 |
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| 151 | #endif |
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| 152 | |
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| 153 | /* If _GNU_SOURCE was defined by the user, turn on all the other features. */ |
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| 154 | #ifdef _GNU_SOURCE |
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| 155 | # undef _ISOC95_SOURCE |
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| 156 | # define _ISOC95_SOURCE 1 |
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| 157 | # undef _ISOC99_SOURCE |
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| 158 | # define _ISOC99_SOURCE 1 |
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| 159 | # undef _POSIX_SOURCE |
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| 160 | # define _POSIX_SOURCE 1 |
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| 161 | # undef _POSIX_C_SOURCE |
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| 162 | # define _POSIX_C_SOURCE 200809L |
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| 163 | # undef _XOPEN_SOURCE |
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| 164 | # define _XOPEN_SOURCE 700 |
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| 165 | # undef _XOPEN_SOURCE_EXTENDED |
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| 166 | # define _XOPEN_SOURCE_EXTENDED 1 |
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| 167 | # undef _LARGEFILE64_SOURCE |
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| 168 | # define _LARGEFILE64_SOURCE 1 |
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| 169 | # undef _BSD_SOURCE |
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| 170 | # define _BSD_SOURCE 1 |
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| 171 | # undef _SVID_SOURCE |
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| 172 | # define _SVID_SOURCE 1 |
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| 173 | # undef _ATFILE_SOURCE |
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| 174 | # define _ATFILE_SOURCE 1 |
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| 175 | #endif |
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| 176 | |
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| 177 | /* If nothing (other than _GNU_SOURCE) is defined, |
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| 178 | define _BSD_SOURCE and _SVID_SOURCE. */ |
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| 179 | #if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \ |
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| 180 | !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \ |
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| 181 | !defined _XOPEN_SOURCE && !defined _BSD_SOURCE && !defined _SVID_SOURCE) |
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| 182 | # define _BSD_SOURCE 1 |
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| 183 | # define _SVID_SOURCE 1 |
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| 184 | #endif |
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| 185 | |
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| 186 | /* This is to enable the ISO C99 extension. Also recognize the old macro |
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| 187 | which was used prior to the standard acceptance. This macro will |
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| 188 | eventually go away and the features enabled by default once the ISO C99 |
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| 189 | standard is widely adopted. */ |
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| 190 | #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \ |
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| 191 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) |
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| 192 | # define __USE_ISOC99 1 |
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| 193 | #endif |
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| 194 | |
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| 195 | /* This is to enable the ISO C90 Amendment 1:1995 extension. */ |
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| 196 | #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \ |
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| 197 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L)) |
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| 198 | # define __USE_ISOC95 1 |
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| 199 | #endif |
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| 200 | |
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| 201 | /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2 |
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| 202 | (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */ |
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| 203 | #if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \ |
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| 204 | !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE) |
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| 205 | # define _POSIX_SOURCE 1 |
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| 206 | # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500 |
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| 207 | # define _POSIX_C_SOURCE 2 |
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| 208 | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600 |
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| 209 | # define _POSIX_C_SOURCE 199506L |
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| 210 | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700 |
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| 211 | # define _POSIX_C_SOURCE 200112L |
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| 212 | # else |
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| 213 | # define _POSIX_C_SOURCE 200809L |
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| 214 | # endif |
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| 215 | # define __USE_POSIX_IMPLICITLY 1 |
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| 216 | #endif |
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| 217 | |
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| 218 | #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE |
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| 219 | # define __USE_POSIX 1 |
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| 220 | #endif |
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| 221 | |
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| 222 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE |
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| 223 | # define __USE_POSIX2 1 |
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| 224 | #endif |
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| 225 | |
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| 226 | #if (_POSIX_C_SOURCE - 0) >= 199309L |
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| 227 | # define __USE_POSIX199309 1 |
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| 228 | #endif |
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| 229 | |
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| 230 | #if (_POSIX_C_SOURCE - 0) >= 199506L |
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| 231 | # define __USE_POSIX199506 1 |
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| 232 | #endif |
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| 233 | |
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| 234 | #if (_POSIX_C_SOURCE - 0) >= 200112L |
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| 235 | # define __USE_XOPEN2K 1 |
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| 236 | # undef __USE_ISOC95 |
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| 237 | # define __USE_ISOC95 1 |
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| 238 | # undef __USE_ISOC99 |
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| 239 | # define __USE_ISOC99 1 |
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| 240 | #endif |
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| 241 | |
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| 242 | #if (_POSIX_C_SOURCE - 0) >= 200809L |
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| 243 | # define __USE_XOPEN2K8 1 |
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| 244 | # undef _ATFILE_SOURCE |
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| 245 | # define _ATFILE_SOURCE 1 |
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| 246 | #endif |
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| 247 | |
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| 248 | #ifdef _XOPEN_SOURCE |
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| 249 | # define __USE_XOPEN 1 |
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| 250 | # if (_XOPEN_SOURCE - 0) >= 500 |
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| 251 | # define __USE_XOPEN_EXTENDED 1 |
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| 252 | # define __USE_UNIX98 1 |
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| 253 | # undef _LARGEFILE_SOURCE |
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| 254 | # define _LARGEFILE_SOURCE 1 |
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| 255 | # if (_XOPEN_SOURCE - 0) >= 600 |
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| 256 | # if (_XOPEN_SOURCE - 0) >= 700 |
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| 257 | # define __USE_XOPEN2K8 1 |
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| 258 | # define __USE_XOPEN2K8XSI 1 |
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| 259 | # endif |
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| 260 | # define __USE_XOPEN2K 1 |
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| 261 | # define __USE_XOPEN2KXSI 1 |
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| 262 | # undef __USE_ISOC95 |
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| 263 | # define __USE_ISOC95 1 |
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| 264 | # undef __USE_ISOC99 |
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| 265 | # define __USE_ISOC99 1 |
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| 266 | # endif |
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| 267 | # else |
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| 268 | # ifdef _XOPEN_SOURCE_EXTENDED |
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| 269 | # define __USE_XOPEN_EXTENDED 1 |
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| 270 | # endif |
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| 271 | # endif |
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| 272 | #endif |
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| 273 | |
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| 274 | #ifdef _LARGEFILE_SOURCE |
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| 275 | # define __USE_LARGEFILE 1 |
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| 276 | #endif |
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| 277 | |
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| 278 | #ifdef _LARGEFILE64_SOURCE |
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| 279 | # define __USE_LARGEFILE64 1 |
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| 280 | #endif |
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| 281 | |
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| 282 | #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 |
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| 283 | # define __USE_FILE_OFFSET64 1 |
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| 284 | #endif |
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| 285 | |
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| 286 | #if defined _BSD_SOURCE || defined _SVID_SOURCE |
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| 287 | # define __USE_MISC 1 |
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| 288 | #endif |
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| 289 | |
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| 290 | #ifdef _BSD_SOURCE |
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| 291 | # define __USE_BSD 1 |
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| 292 | #endif |
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| 293 | |
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| 294 | #ifdef _SVID_SOURCE |
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| 295 | # define __USE_SVID 1 |
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| 296 | #endif |
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| 297 | |
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| 298 | #ifdef _ATFILE_SOURCE |
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| 299 | # define __USE_ATFILE 1 |
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| 300 | #endif |
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| 301 | |
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| 302 | #ifdef _GNU_SOURCE |
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| 303 | # define __USE_GNU 1 |
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| 304 | #endif |
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| 305 | |
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| 306 | #if defined _REENTRANT || defined _THREAD_SAFE |
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| 307 | # define __USE_REENTRANT 1 |
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| 308 | #endif |
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| 309 | |
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| 310 | #if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \ |
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| 311 | && defined __OPTIMIZE__ && __OPTIMIZE__ > 0 |
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| 312 | # if !__GNUC_PREREQ (4, 1) |
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| 313 | # ifdef __GNUC_RH_RELEASE__ |
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| 314 | # warning _FORTIFY_SOURCE supported only with GCC 4.1 and later |
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| 315 | # endif |
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| 316 | # define __USE_FORTIFY_LEVEL 0 |
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| 317 | # elif _FORTIFY_SOURCE > 1 |
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| 318 | # define __USE_FORTIFY_LEVEL 2 |
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| 319 | # else |
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| 320 | # define __USE_FORTIFY_LEVEL 1 |
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| 321 | # endif |
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| 322 | #else |
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| 323 | # define __USE_FORTIFY_LEVEL 0 |
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| 324 | #endif |
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| 325 | |
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| 326 | /* We do support the IEC 559 math functionality, real and complex. */ |
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| 327 | #define __STDC_IEC_559__ 1 |
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| 328 | #define __STDC_IEC_559_COMPLEX__ 1 |
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| 329 | |
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| 330 | /* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */ |
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| 331 | #define __STDC_ISO_10646__ 200009L |
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| 332 | |
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| 333 | /* This macro indicates that the installed library is the GNU C Library. |
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| 334 | For historic reasons the value now is 6 and this will stay from now |
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| 335 | on. The use of this variable is deprecated. Use __GLIBC__ and |
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| 336 | __GLIBC_MINOR__ now (see below) when you want to test for a specific |
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| 337 | GNU C library version and use the values in <gnu/lib-names.h> to get |
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| 338 | the sonames of the shared libraries. */ |
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| 339 | #undef __GNU_LIBRARY__ |
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| 340 | #define __GNU_LIBRARY__ 6 |
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| 341 | |
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| 342 | /* Major and minor version number of the GNU C library package. Use |
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| 343 | these macros to test for features in specific releases. */ |
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| 344 | #define __GLIBC__ 2 |
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| 345 | #define __GLIBC_MINOR__ 12 |
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| 346 | |
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| 347 | #define __GLIBC_PREREQ(maj, min) \ |
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| 348 | ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) |
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| 349 | |
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| 350 | /* Decide whether a compiler supports the long long datatypes. */ |
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| 351 | #if defined __GNUC__ \ |
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| 352 | || (defined __PGI && defined __i386__ ) \ |
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| 353 | || (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \ |
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| 354 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) |
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| 355 | # define __GLIBC_HAVE_LONG_LONG 1 |
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| 356 | #endif |
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| 357 | |
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| 358 | /* This is here only because every header file already includes this one. */ |
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| 359 | #ifndef __ASSEMBLER__ |
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| 360 | # ifndef _SYS_CDEFS_H |
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| 361 | # include <sys/cdefs.h> |
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| 362 | # endif |
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| 363 | |
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| 364 | /* If we don't have __REDIRECT, prototypes will be missing if |
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| 365 | __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */ |
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| 366 | # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT |
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| 367 | # define __USE_LARGEFILE 1 |
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| 368 | # define __USE_LARGEFILE64 1 |
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| 369 | # endif |
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| 370 | |
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| 371 | #endif /* !ASSEMBLER */ |
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| 372 | |
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| 373 | /* Decide whether we can define 'extern inline' functions in headers. */ |
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| 374 | #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ |
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| 375 | && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \ |
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| 376 | && defined __extern_inline |
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| 377 | # define __USE_EXTERN_INLINES 1 |
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| 378 | #endif |
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| 379 | |
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| 380 | |
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| 381 | /* This is here only because every header file already includes this one. |
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| 382 | Get the definitions of all the appropriate `__stub_FUNCTION' symbols. |
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| 383 | <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub |
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| 384 | that will always return failure (and set errno to ENOSYS). */ |
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| 385 | #include <gnu/stubs.h> |
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| 386 | |
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| 387 | |
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| 388 | #endif /* features.h */ |
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