1 | /* Copyright (C) 1991, 92, 93, 95, 96, 97 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 Library General Public License as
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6 | published by the Free Software Foundation; either version 2 of the
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7 | 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 | Library 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 Library General Public
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15 | License along with the GNU C Library; see the file COPYING.LIB. If not,
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16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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17 | Boston, MA 02111-1307, USA. */
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18 |
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19 | #ifndef _FEATURES_H
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20 |
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21 | #define _FEATURES_H 1
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22 |
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23 | /* These are defined by the user (or the compiler)
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24 | to specify the desired environment:
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25 |
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26 | __STRICT_ANSI__ ISO Standard C.
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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 | _XOPEN_SOURCE Includes POSIX and XPG things.
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31 | _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
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32 | _BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
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33 | _SVID_SOURCE ISO C, POSIX, and SVID things.
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34 | _GNU_SOURCE All of the above, plus GNU extensions.
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35 | _REENTRANT Select additionally reentrant object.
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36 | _THREAD_SAFE Same as _REENTRANT, often used by other systems.
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37 |
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38 | The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
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39 | If none of these are defined, the default is all but _GNU_SOURCE.
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40 | If more than one of these are defined, they accumulate.
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41 | For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
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42 | together give you ISO C, 1003.1, and 1003.2, but nothing else.
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43 |
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44 | These are defined by this file and are used by the
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45 | header files to decide what to declare or define:
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46 |
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47 | __USE_POSIX Define IEEE Std 1003.1 things.
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48 | __USE_POSIX2 Define IEEE Std 1003.2 things.
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49 | __USE_POSIX199309 Define IEEE Std 1003.1b things.
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50 | __USE_XOPEN Define XPG things.
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51 | __USE_XOPEN_EXTENDED Define X/Open Unix things.
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52 | __USE_BSD Define 4.3BSD things.
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53 | __USE_SVID Define SVID things.
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54 | __USE_MISC Define things common to BSD and System V Unix.
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55 | __USE_GNU Define GNU extensions.
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56 | __USE_REENTRANT Define reentrant/thread-safe *_r functions.
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57 | __FAVOR_BSD Favor 4.3BSD things in cases of conflict.
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58 |
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59 | The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
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60 | defined by this file unconditionally. `__GNU_LIBRARY__' is provided
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61 | only for compatibility. All new code should use the other symbols
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62 | to test for features.
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63 |
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64 | All macros listed above as possibly being defined by this file are
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65 | explicitly undefined if they are not explicitly defined.
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66 | Feature-test macros that are not defined by the user or compiler
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67 | but are implied by the other feature-test macros defined (or by the
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68 | lack of any definitions) are defined by the file. */
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69 |
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70 |
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71 | /* Undefine everything, so we get a clean slate. */
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72 | #undef __USE_POSIX
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73 | #undef __USE_POSIX2
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74 | #undef __USE_POSIX199309
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75 | #undef __USE_XOPEN
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76 | #undef __USE_XOPEN_EXTENDED
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77 | #undef __USE_BSD
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78 | #undef __USE_SVID
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79 | #undef __USE_MISC
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80 | #undef __USE_GNU
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81 | #undef __USE_REENTRANT
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82 | #undef __FAVOR_BSD
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83 | #undef __KERNEL_STRICT_NAMES
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84 |
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85 | /* Suppress kernel-name space pollution unless user expressedly asks
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86 | for it. */
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87 | #ifndef _LOOSE_KERNEL_NAMES
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88 | # define __KERNEL_STRICT_NAMES
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89 | #endif
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90 |
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91 | /* Always use ISO C things. */
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92 | #define __USE_ANSI 1
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93 | #define _POSIX_SOURCE
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94 |
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95 | /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
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96 | #if defined _BSD_SOURCE && \
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97 | !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
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98 | defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
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99 | defined _GNU_SOURCE || defined _SVID_SOURCE)
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100 | # define __FAVOR_BSD 1
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101 | #endif
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102 |
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103 | /* If _GNU_SOURCE was defined by the user, turn on all the other features. */
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104 | #ifdef _GNU_SOURCE
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105 | #undef _POSIX_SOURCE
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106 | #define _POSIX_SOURCE 1
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107 | #undef _POSIX_C_SOURCE
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108 | #define _POSIX_C_SOURCE 199309L
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109 | #undef _XOPEN_SOURCE
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110 | #define _XOPEN_SOURCE 1
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111 | #undef _XOPEN_SOURCE_EXTENDED
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112 | #define _XOPEN_SOURCE_EXTENDED 1
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113 | #undef _BSD_SOURCE
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114 | #define _BSD_SOURCE 1
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115 | #undef _SVID_SOURCE
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116 | #define _SVID_SOURCE 1
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117 | #endif
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118 |
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119 | /* If nothing (other than _GNU_SOURCE) is defined,
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120 | define _BSD_SOURCE and _SVID_SOURCE. */
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121 | #if (!defined __STRICT_ANSI__ && !defined _POSIX_SOURCE && \
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122 | !defined _POSIX_C_SOURCE && !defined _XOPEN_SOURCE && \
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123 | !defined _XOPEN_SOURCE_EXTENDED && !defined _BSD_SOURCE && \
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124 | !defined _SVID_SOURCE)
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125 | #define _BSD_SOURCE 1
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126 | #define _SVID_SOURCE 1
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127 | #endif
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128 |
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129 | /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
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130 | (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
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131 | #if (!defined __STRICT_ANSI__ && !defined _POSIX_SOURCE && \
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132 | !defined _POSIX_C_SOURCE)
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133 | #define _POSIX_SOURCE 1
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134 | #ifdef _XOPEN_SOURCE
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135 | #define _POSIX_C_SOURCE 2
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136 | #else
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137 | #define _POSIX_C_SOURCE 199309L
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138 | #endif
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139 | #endif
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140 |
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141 | #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
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142 | #define __USE_POSIX 1
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143 | #endif
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144 |
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145 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
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146 | #define __USE_POSIX2 1
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147 | #endif
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148 |
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149 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 199309L
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150 | #define __USE_POSIX199309 1
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151 | #endif
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152 |
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153 | #ifdef _XOPEN_SOURCE
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154 | #define __USE_XOPEN 1
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155 | #ifdef _XOPEN_SOURCE_EXTENDED
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156 | #define __USE_XOPEN_EXTENDED 1
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157 | #endif
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158 | #endif
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159 |
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160 | #if defined _BSD_SOURCE || defined _SVID_SOURCE
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161 | #define __USE_MISC 1
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162 | #endif
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163 |
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164 | #ifdef _BSD_SOURCE
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165 | #define __USE_BSD 1
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166 | #endif
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167 |
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168 | #ifdef _SVID_SOURCE
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169 | #define __USE_SVID 1
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170 | #endif
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171 |
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172 | #ifdef _GNU_SOURCE
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173 | #define __USE_GNU 1
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174 | #endif
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175 |
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176 | #if defined _REENTRANT || defined _THREAD_SAFE
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177 | #define __USE_REENTRANT 1
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178 | #endif
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179 |
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180 |
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181 | /* This macro indicates that the installed library is the GNU C Library.
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182 | For historic reasons the value now is 6 and this will stay from now
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183 | on. The use of this variable is deprecated. Use __GLIBC__ and
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184 | __GLIBC_MINOR__ now (see below) when you want to test for a specific
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185 | GNU C library version and use the values in <gnu/lib-names.h> to get
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186 | the sonames of the shared libraries. */
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187 | #undef __GNU_LIBRARY__
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188 | #define __GNU_LIBRARY__ 6
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189 |
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190 | /* Major and minor version number of the GNU C library package. Use
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191 | these macros to test for features in specific releases. */
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192 | #define __GLIBC__ 2
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193 | #define __GLIBC_MINOR__ 0
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194 |
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195 |
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196 | #if !defined __GNUC__ || __GNUC__ < 2
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197 | /* In GCC version 2, (__extension__ EXPR) will not complain
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198 | about GCC extensions used in EXPR under -ansi or -pedantic. */
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199 | #define __extension__
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200 | #endif
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201 |
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202 |
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203 | /* This is here only because every header file already includes this one. */
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204 | #ifndef __ASSEMBLER__
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205 | #include "sys/cdefs.h"
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206 | #endif
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207 |
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208 | /* This is here only because every header file already includes this one. */
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209 | #ifndef _LIBC
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210 | /* Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
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211 | <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
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212 | which will always return failure (and set errno to ENOSYS).
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213 |
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214 | We avoid including <gnu/stubs.h> when compiling the C library itself to
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215 | avoid a dependency loop. stubs.h depends on every object file. If
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216 | this #include were done for the library source code, then every object
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217 | file would depend on stubs.h. */
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218 |
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219 | #include "gnu/stubs.h"
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220 | #endif
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221 |
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222 |
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223 | #endif /* features.h */
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