1 /* Copyright (C) 1991,92,93,95,96,97,98,99, 2000 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
22 /* These are defined by the user (or the compiler)
23 to specify the desired environment:
25 __STRICT_ANSI__ ISO Standard C.
26 _ISOC99_SOURCE Extensions to ISO C89 from ISO C99.
27 _POSIX_SOURCE IEEE Std 1003.1.
28 _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
29 if >=199309L, add IEEE Std 1003.1b-1993;
30 if >=199506L, add IEEE Std 1003.1c-1995
31 _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
32 Single Unix conformance is wanted.
33 _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
34 _LARGEFILE_SOURCE Some more functions for correct standard I/O.
35 _LARGEFILE64_SOURCE Additional functionality from LFS for large files.
36 _FILE_OFFSET_BITS=N Select default filesystem interface.
37 _BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
38 _SVID_SOURCE ISO C, POSIX, and SVID things.
39 _GNU_SOURCE All of the above, plus GNU extensions.
40 _REENTRANT Select additionally reentrant object.
41 _THREAD_SAFE Same as _REENTRANT, often used by other systems.
43 The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
44 If none of these are defined, the default is all but _GNU_SOURCE.
45 If more than one of these are defined, they accumulate.
46 For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
47 together give you ISO C, 1003.1, and 1003.2, but nothing else.
49 These are defined by this file and are used by the
50 header files to decide what to declare or define:
52 __USE_ISOC99 Define ISO C99 things.
53 __USE_POSIX Define IEEE Std 1003.1 things.
54 __USE_POSIX2 Define IEEE Std 1003.2 things.
55 __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
56 __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
57 __USE_XOPEN Define XPG things.
58 __USE_XOPEN_EXTENDED Define X/Open Unix things.
59 __USE_UNIX98 Define Single Unix V2 things.
60 __USE_XOPEN2K Define XPG6 things
61 __USE_LARGEFILE64 Define LFS things with separate names.
62 __USE_FILE_OFFSET64 Define 64bit interface as default.
63 __USE_BSD Define 4.3BSD things.
64 __USE_SVID Define SVID things.
65 __USE_MISC Define things common to BSD and System V Unix.
66 __USE_GNU Define GNU extensions.
67 __USE_REENTRANT Define reentrant/thread-safe *_r functions.
68 __FAVOR_BSD Favor 4.3BSD things in cases of conflict.
70 The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
71 defined by this file unconditionally. `__GNU_LIBRARY__' is provided
72 only for compatibility. All new code should use the other symbols
75 All macros listed above as possibly being defined by this file are
76 explicitly undefined if they are not explicitly defined.
77 Feature-test macros that are not defined by the user or compiler
78 but are implied by the other feature-test macros defined (or by the
79 lack of any definitions) are defined by the file. */
82 /* Undefine everything, so we get a clean slate. */
86 #undef __USE_POSIX199309
87 #undef __USE_POSIX199506
89 #undef __USE_XOPEN_EXTENDED
92 #undef __USE_LARGEFILE
93 #undef __USE_LARGEFILE64
94 #undef __USE_FILE_OFFSET64
99 #undef __USE_REENTRANT
101 #undef __KERNEL_STRICT_NAMES
103 /* Suppress kernel-name space pollution unless user expressedly asks
105 #ifndef _LOOSE_KERNEL_NAMES
106 # define __KERNEL_STRICT_NAMES
109 /* Always use ISO C things. */
113 /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
114 #if defined _BSD_SOURCE && \
115 !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
116 defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
117 defined _GNU_SOURCE || defined _SVID_SOURCE)
118 # define __FAVOR_BSD 1
121 /* If _GNU_SOURCE was defined by the user, turn on all the other features. */
123 # undef _ISOC99_SOURCE
124 # define _ISOC99_SOURCE 1
125 # undef _POSIX_SOURCE
126 # define _POSIX_SOURCE 1
127 # undef _POSIX_C_SOURCE
128 # define _POSIX_C_SOURCE 199506L
129 # undef _XOPEN_SOURCE
130 # define _XOPEN_SOURCE 600
131 # undef _XOPEN_SOURCE_EXTENDED
132 # define _XOPEN_SOURCE_EXTENDED 1
133 # undef _LARGEFILE64_SOURCE
134 # define _LARGEFILE64_SOURCE 1
136 # define _BSD_SOURCE 1
138 # define _SVID_SOURCE 1
141 /* If nothing (other than _GNU_SOURCE) is defined,
142 define _BSD_SOURCE and _SVID_SOURCE. */
143 #if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \
144 !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
145 !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
146 !defined _BSD_SOURCE && !defined _SVID_SOURCE)
147 # define _BSD_SOURCE 1
148 # define _SVID_SOURCE 1
151 /* This is to enable the ISO C99 extension. Also recognize the old macro
152 which was used prior to the standard acceptance. This macro will
153 eventually go away and the features enabled by default once the ISO C99
154 standard is widely adopted. */
155 #if defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE
156 # define __USE_ISOC99 1
159 /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
160 (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
161 #if (!defined __STRICT_ANSI__ && !defined _POSIX_SOURCE && \
162 !defined _POSIX_C_SOURCE)
163 # define _POSIX_SOURCE 1
164 # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) != 500
165 # define _POSIX_C_SOURCE 2
167 # define _POSIX_C_SOURCE 199506L
171 #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
172 # define __USE_POSIX 1
175 #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
176 # define __USE_POSIX2 1
179 #if (_POSIX_C_SOURCE - 0) >= 199309L
180 # define __USE_POSIX199309 1
183 #if (_POSIX_C_SOURCE - 0) >= 199506L
184 # define __USE_POSIX199506 1
188 # define __USE_XOPEN 1
189 # if (_XOPEN_SOURCE - 0) >= 500
190 # define __USE_XOPEN_EXTENDED 1
191 # define __USE_UNIX98 1
192 # undef _LARGEFILE_SOURCE
193 # define _LARGEFILE_SOURCE 1
194 # if (_XOPEN_SOURCE - 0) == 600
195 # define __USE_XOPEN2K 1
198 # ifdef _XOPEN_SOURCE_EXTENDED
199 # define __USE_XOPEN_EXTENDED 1
204 #ifdef _LARGEFILE_SOURCE
205 # define __USE_LARGEFILE 1
208 #ifdef _LARGEFILE64_SOURCE
209 # define __USE_LARGEFILE64 1
212 #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
213 # define __USE_FILE_OFFSET64 1
216 #if defined _BSD_SOURCE || defined _SVID_SOURCE
217 # define __USE_MISC 1
225 # define __USE_SVID 1
232 #if defined _REENTRANT || defined _THREAD_SAFE
233 # define __USE_REENTRANT 1
236 /* We do support the IEC 559 math functionality, real and complex. */
237 #define __STDC_IEC_559__ 1
238 #define __STDC_IEC_559_COMPLEX__ 1
240 /* This macro indicates that the installed library is the GNU C Library.
241 For historic reasons the value now is 6 and this will stay from now
242 on. The use of this variable is deprecated. Use __GLIBC__ and
243 __GLIBC_MINOR__ now (see below) when you want to test for a specific
244 GNU C library version and use the values in <gnu/lib-names.h> to get
245 the sonames of the shared libraries. */
246 #undef __GNU_LIBRARY__
247 #define __GNU_LIBRARY__ 6
249 /* Major and minor version number of the GNU C library package. Use
250 these macros to test for features in specific releases. */
252 #define __GLIBC_MINOR__ 2
254 /* Convenience macros to test the versions of glibc and gcc.
256 #if __GNUC_PREREQ (2,8)
257 ... code requiring gcc 2.8 or later ...
259 Note - they won't work for gcc1 or glibc1, since the _MINOR macros
260 were not defined then. */
261 #if defined __GNUC__ && defined __GNUC_MINOR__
262 # define __GNUC_PREREQ(maj, min) \
263 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
265 # define __GNUC_PREREQ(maj, min) 0
268 #define __GLIBC_PREREQ(maj, min) \
269 ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
271 /* This is here only because every header file already includes this one. */
272 #ifndef __ASSEMBLER__
274 # include <sys/cdefs.h>
277 /* If we don't have __REDIRECT, prototypes will be missing if
278 __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
279 # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
280 # define __USE_LARGEFILE
281 # define __USE_LARGEFILE64
284 #endif /* !ASSEMBLER */
286 /* Decide whether we can define 'extern inline' functions in headers. */
287 #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__
288 # define __USE_EXTERN_INLINES 1
291 /* This is here only because every header file already includes this one. */
293 /* Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
294 <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
295 which will always return failure (and set errno to ENOSYS).
297 We avoid including <gnu/stubs.h> when compiling the C library itself to
298 avoid a dependency loop. stubs.h depends on every object file. If
299 this #include were done for the library source code, then every object
300 file would depend on stubs.h. */
302 # include <gnu/stubs.h>
305 #endif /* features.h */