1 | /* Copyright (C) 1991-1993,1995-2006,2007,2009 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_XOPEN2K8 Define XPG7 things.
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70 | __USE_LARGEFILE Define correct standard I/O things.
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71 | __USE_LARGEFILE64 Define LFS things with separate names.
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72 | __USE_FILE_OFFSET64 Define 64bit interface as default.
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73 | __USE_BSD Define 4.3BSD things.
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74 | __USE_SVID Define SVID things.
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75 | __USE_MISC Define things common to BSD and System V Unix.
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76 | __USE_ATFILE Define *at interfaces and AT_* constants for them.
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77 | __USE_GNU Define GNU extensions.
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78 | __USE_REENTRANT Define reentrant/thread-safe *_r functions.
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79 | __USE_FORTIFY_LEVEL Additional security measures used, according to level.
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80 | __FAVOR_BSD Favor 4.3BSD things in cases of conflict.
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81 |
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82 | The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
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83 | defined by this file unconditionally. `__GNU_LIBRARY__' is provided
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84 | only for compatibility. All new code should use the other symbols
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85 | to test for features.
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86 |
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87 | All macros listed above as possibly being defined by this file are
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88 | explicitly undefined if they are not explicitly defined.
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89 | Feature-test macros that are not defined by the user or compiler
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90 | but are implied by the other feature-test macros defined (or by the
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91 | lack of any definitions) are defined by the file. */
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92 |
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93 |
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94 | /* Undefine everything, so we get a clean slate. */
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95 | #undef __USE_ISOC99
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96 | #undef __USE_ISOC95
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97 | #undef __USE_POSIX
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98 | #undef __USE_POSIX2
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99 | #undef __USE_POSIX199309
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100 | #undef __USE_POSIX199506
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101 | #undef __USE_XOPEN
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102 | #undef __USE_XOPEN_EXTENDED
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103 | #undef __USE_UNIX98
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104 | #undef __USE_XOPEN2K
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105 | #undef __USE_XOPEN2K8
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106 | #undef __USE_LARGEFILE
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107 | #undef __USE_LARGEFILE64
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108 | #undef __USE_FILE_OFFSET64
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109 | #undef __USE_BSD
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110 | #undef __USE_SVID
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111 | #undef __USE_MISC
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112 | #undef __USE_ATFILE
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113 | #undef __USE_GNU
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114 | #undef __USE_REENTRANT
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115 | #undef __USE_FORTIFY_LEVEL
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116 | #undef __FAVOR_BSD
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117 | #undef __KERNEL_STRICT_NAMES
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118 |
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119 | /* Suppress kernel-name space pollution unless user expressedly asks
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120 | for it. */
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121 | #ifndef _LOOSE_KERNEL_NAMES
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122 | # define __KERNEL_STRICT_NAMES
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123 | #endif
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124 |
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125 | /* Always use ISO C things. */
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126 | #define __USE_ANSI 1
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127 |
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128 | /* Convenience macros to test the versions of glibc and gcc.
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129 | Use them like this:
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130 | #if __GNUC_PREREQ (2,8)
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131 | ... code requiring gcc 2.8 or later ...
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132 | #endif
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133 | Note - they won't work for gcc1 or glibc1, since the _MINOR macros
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134 | were not defined then. */
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135 | #if defined __GNUC__ && defined __GNUC_MINOR__
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136 | # define __GNUC_PREREQ(maj, min) \
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137 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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138 | #else
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139 | # define __GNUC_PREREQ(maj, min) 0
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140 | #endif
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141 |
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142 |
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143 | /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
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144 | #if defined _BSD_SOURCE && \
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145 | !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
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146 | defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
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147 | defined _GNU_SOURCE || defined _SVID_SOURCE)
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148 | # define __FAVOR_BSD 1
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149 | #endif
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150 |
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151 | /* If _GNU_SOURCE was defined by the user, turn on all the other features. */
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152 | #ifdef _GNU_SOURCE
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153 | # undef _ISOC99_SOURCE
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154 | # define _ISOC99_SOURCE 1
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155 | # undef _POSIX_SOURCE
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156 | # define _POSIX_SOURCE 1
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157 | # undef _POSIX_C_SOURCE
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158 | # define _POSIX_C_SOURCE 200809L
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159 | # undef _XOPEN_SOURCE
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160 | # define _XOPEN_SOURCE 700
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161 | # undef _XOPEN_SOURCE_EXTENDED
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162 | # define _XOPEN_SOURCE_EXTENDED 1
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163 | # undef _LARGEFILE64_SOURCE
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164 | # define _LARGEFILE64_SOURCE 1
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165 | # undef _BSD_SOURCE
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166 | # define _BSD_SOURCE 1
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167 | # undef _SVID_SOURCE
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168 | # define _SVID_SOURCE 1
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169 | # undef _ATFILE_SOURCE
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170 | # define _ATFILE_SOURCE 1
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171 | #endif
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172 |
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173 | /* If nothing (other than _GNU_SOURCE) is defined,
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174 | define _BSD_SOURCE and _SVID_SOURCE. */
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175 | #if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \
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176 | !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
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177 | !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
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178 | !defined _BSD_SOURCE && !defined _SVID_SOURCE)
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179 | # define _BSD_SOURCE 1
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180 | # define _SVID_SOURCE 1
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181 | #endif
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182 |
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183 | /* This is to enable the ISO C99 extension. Also recognize the old macro
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184 | which was used prior to the standard acceptance. This macro will
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185 | eventually go away and the features enabled by default once the ISO C99
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186 | standard is widely adopted. */
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187 | #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
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188 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
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189 | # define __USE_ISOC99 1
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190 | #endif
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191 |
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192 | /* This is to enable the ISO C90 Amendment 1:1995 extension. */
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193 | #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
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194 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L))
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195 | # define __USE_ISOC95 1
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196 | #endif
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197 |
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198 | /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
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199 | (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
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200 | #if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \
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201 | !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE)
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202 | # define _POSIX_SOURCE 1
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203 | # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
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204 | # define _POSIX_C_SOURCE 2
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205 | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600
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206 | # define _POSIX_C_SOURCE 199506L
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207 | # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700
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208 | # define _POSIX_C_SOURCE 200112L
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209 | # else
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210 | # define _POSIX_C_SOURCE 200809L
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211 | # endif
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212 | # define __USE_POSIX_IMPLICITLY 1
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213 | #endif
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214 |
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215 | #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
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216 | # define __USE_POSIX 1
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217 | #endif
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218 |
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219 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
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220 | # define __USE_POSIX2 1
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221 | #endif
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222 |
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223 | #if (_POSIX_C_SOURCE - 0) >= 199309L
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224 | # define __USE_POSIX199309 1
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225 | #endif
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226 |
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227 | #if (_POSIX_C_SOURCE - 0) >= 199506L
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228 | # define __USE_POSIX199506 1
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229 | #endif
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230 |
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231 | #if (_POSIX_C_SOURCE - 0) >= 200112L
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232 | # define __USE_XOPEN2K 1
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233 | # undef __USE_ISOC99
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234 | # define __USE_ISOC99 1
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235 | #endif
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236 |
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237 | #if (_POSIX_C_SOURCE - 0) >= 200809L
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238 | # define __USE_XOPEN2K8 1
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239 | # undef _ATFILE_SOURCE
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240 | # define _ATFILE_SOURCE 1
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241 | #endif
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242 |
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243 | #ifdef _XOPEN_SOURCE
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244 | # define __USE_XOPEN 1
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245 | # if (_XOPEN_SOURCE - 0) >= 500
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246 | # define __USE_XOPEN_EXTENDED 1
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247 | # define __USE_UNIX98 1
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248 | # undef _LARGEFILE_SOURCE
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249 | # define _LARGEFILE_SOURCE 1
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250 | # if (_XOPEN_SOURCE - 0) >= 600
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251 | # if (_XOPEN_SOURCE - 0) >= 700
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252 | # define __USE_XOPEN2K8 1
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253 | # endif
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254 | # define __USE_XOPEN2K 1
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255 | # undef __USE_ISOC99
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256 | # define __USE_ISOC99 1
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257 | # endif
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258 | # else
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259 | # ifdef _XOPEN_SOURCE_EXTENDED
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260 | # define __USE_XOPEN_EXTENDED 1
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261 | # endif
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262 | # endif
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263 | #endif
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264 |
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265 | #ifdef _LARGEFILE_SOURCE
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266 | # define __USE_LARGEFILE 1
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267 | #endif
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268 |
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269 | #ifdef _LARGEFILE64_SOURCE
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270 | # define __USE_LARGEFILE64 1
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271 | #endif
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272 |
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273 | #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
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274 | # define __USE_FILE_OFFSET64 1
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275 | #endif
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276 |
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277 | #if defined _BSD_SOURCE || defined _SVID_SOURCE
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278 | # define __USE_MISC 1
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279 | #endif
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280 |
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281 | #ifdef _BSD_SOURCE
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282 | # define __USE_BSD 1
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283 | #endif
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284 |
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285 | #ifdef _SVID_SOURCE
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286 | # define __USE_SVID 1
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287 | #endif
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288 |
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289 | #ifdef _ATFILE_SOURCE
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290 | # define __USE_ATFILE 1
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291 | #endif
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292 |
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293 | #ifdef _GNU_SOURCE
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294 | # define __USE_GNU 1
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295 | #endif
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296 |
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297 | #if defined _REENTRANT || defined _THREAD_SAFE
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298 | # define __USE_REENTRANT 1
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299 | #endif
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300 |
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301 | #if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \
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302 | && __GNUC_PREREQ (4, 1) && defined __OPTIMIZE__ && __OPTIMIZE__ > 0
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303 | # if _FORTIFY_SOURCE > 1
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304 | # define __USE_FORTIFY_LEVEL 2
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305 | # else
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306 | # define __USE_FORTIFY_LEVEL 1
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307 | # endif
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308 | #else
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309 | # define __USE_FORTIFY_LEVEL 0
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310 | #endif
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311 |
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312 | /* We do support the IEC 559 math functionality, real and complex. */
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313 | #define __STDC_IEC_559__ 1
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314 | #define __STDC_IEC_559_COMPLEX__ 1
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315 |
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316 | /* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */
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317 | #define __STDC_ISO_10646__ 200009L
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318 |
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319 | /* This macro indicates that the installed library is the GNU C Library.
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320 | For historic reasons the value now is 6 and this will stay from now
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321 | on. The use of this variable is deprecated. Use __GLIBC__ and
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322 | __GLIBC_MINOR__ now (see below) when you want to test for a specific
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323 | GNU C library version and use the values in <gnu/lib-names.h> to get
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324 | the sonames of the shared libraries. */
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325 | #undef __GNU_LIBRARY__
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326 | #define __GNU_LIBRARY__ 6
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327 |
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328 | /* Major and minor version number of the GNU C library package. Use
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329 | these macros to test for features in specific releases. */
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330 | #define __GLIBC__ 2
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331 | #define __GLIBC_MINOR__ 11
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332 |
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333 | #define __GLIBC_PREREQ(maj, min) \
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334 | ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
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335 |
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336 | /* Decide whether a compiler supports the long long datatypes. */
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337 | #if defined __GNUC__ \
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338 | || (defined __PGI && defined __i386__ ) \
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339 | || (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \
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340 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
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341 | # define __GLIBC_HAVE_LONG_LONG 1
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342 | #endif
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343 |
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344 | /* This is here only because every header file already includes this one. */
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345 | #ifndef __ASSEMBLER__
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346 | # ifndef _SYS_CDEFS_H
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347 | # include <sys/cdefs.h>
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348 | # endif
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349 |
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350 | /* If we don't have __REDIRECT, prototypes will be missing if
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351 | __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
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352 | # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
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353 | # define __USE_LARGEFILE 1
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354 | # define __USE_LARGEFILE64 1
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355 | # endif
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356 |
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357 | #endif /* !ASSEMBLER */
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358 |
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359 | /* Decide whether we can define 'extern inline' functions in headers. */
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360 | #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
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361 | && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \
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362 | && defined __extern_inline
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363 | # define __USE_EXTERN_INLINES 1
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364 | #endif
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365 |
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366 |
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367 | /* This is here only because every header file already includes this one.
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368 | Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
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369 | <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
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370 | that will always return failure (and set errno to ENOSYS). */
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371 | #include <gnu/stubs.h>
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372 |
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373 |
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374 | #endif /* features.h */
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