1 /* Copyright (C) 1991,1992,1993,1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 /* These are defined by the user (or the compiler)
24 to specify the desired environment:
26 __STRICT_ANSI__ ISO Standard C.
27 _ISOC99_SOURCE Extensions to ISO C89 from ISO C99.
28 _POSIX_SOURCE IEEE Std 1003.1.
29 _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
30 if >=199309L, add IEEE Std 1003.1b-1993;
31 if >=199506L, add IEEE Std 1003.1c-1995;
32 if >=200112L, all of IEEE 1003.1-2004
33 _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
34 Single Unix conformance is wanted, to 600 for the
35 upcoming sixth revision.
36 _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
37 _LARGEFILE_SOURCE Some more functions for correct standard I/O.
38 _LARGEFILE64_SOURCE Additional functionality from LFS for large files.
39 _FILE_OFFSET_BITS=N Select default filesystem interface.
40 _BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
41 _SVID_SOURCE ISO C, POSIX, and SVID things.
42 _ATFILE_SOURCE Additional *at interfaces.
43 _GNU_SOURCE All of the above, plus GNU extensions.
44 _REENTRANT Select additionally reentrant object.
45 _THREAD_SAFE Same as _REENTRANT, often used by other systems.
46 _FORTIFY_SOURCE If set to numeric value > 0 additional security
47 measures are defined, according to level.
49 The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
50 If none of these are defined, the default is to have _SVID_SOURCE,
51 _BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
52 199506L. If more than one of these are defined, they accumulate.
53 For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
54 together give you ISO C, 1003.1, and 1003.2, but nothing else.
56 These are defined by this file and are used by the
57 header files to decide what to declare or define:
59 __USE_ISOC99 Define ISO C99 things.
60 __USE_POSIX Define IEEE Std 1003.1 things.
61 __USE_POSIX2 Define IEEE Std 1003.2 things.
62 __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
63 __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
64 __USE_XOPEN Define XPG things.
65 __USE_XOPEN_EXTENDED Define X/Open Unix things.
66 __USE_UNIX98 Define Single Unix V2 things.
67 __USE_XOPEN2K Define XPG6 things.
68 __USE_LARGEFILE Define correct standard I/O things.
69 __USE_LARGEFILE64 Define LFS things with separate names.
70 __USE_FILE_OFFSET64 Define 64bit interface as default.
71 __USE_BSD Define 4.3BSD things.
72 __USE_SVID Define SVID things.
73 __USE_MISC Define things common to BSD and System V Unix.
74 __USE_ATFILE Define *at interfaces and AT_* constants for them.
75 __USE_GNU Define GNU extensions.
76 __USE_REENTRANT Define reentrant/thread-safe *_r functions.
77 __USE_FORTIFY_LEVEL Additional security measures used, according to level.
78 __FAVOR_BSD Favor 4.3BSD things in cases of conflict.
80 The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
81 defined by this file unconditionally. `__GNU_LIBRARY__' is provided
82 only for compatibility. All new code should use the other symbols
85 All macros listed above as possibly being defined by this file are
86 explicitly undefined if they are not explicitly defined.
87 Feature-test macros that are not defined by the user or compiler
88 but are implied by the other feature-test macros defined (or by the
89 lack of any definitions) are defined by the file. */
92 /* Undefine everything, so we get a clean slate. */
96 #undef __USE_POSIX199309
97 #undef __USE_POSIX199506
99 #undef __USE_XOPEN_EXTENDED
102 #undef __USE_LARGEFILE
103 #undef __USE_LARGEFILE64
104 #undef __USE_FILE_OFFSET64
110 #undef __USE_REENTRANT
111 #undef __USE_FORTIFY_LEVEL
113 #undef __KERNEL_STRICT_NAMES
115 /* Suppress kernel-name space pollution unless user expressedly asks
117 #ifndef _LOOSE_KERNEL_NAMES
118 # define __KERNEL_STRICT_NAMES
121 /* Always use ISO C things. */
124 /* Convenience macros to test the versions of glibc and gcc.
126 #if __GNUC_PREREQ (2,8)
127 ... code requiring gcc 2.8 or later ...
129 Note - they won't work for gcc1 or glibc1, since the _MINOR macros
130 were not defined then. */
131 #if defined __GNUC__ && defined __GNUC_MINOR__
132 # define __GNUC_PREREQ(maj, min) \
133 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
135 # define __GNUC_PREREQ(maj, min) 0
139 /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
140 #if defined _BSD_SOURCE && \
141 !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
142 defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
143 defined _GNU_SOURCE || defined _SVID_SOURCE)
144 # define __FAVOR_BSD 1
147 /* If _GNU_SOURCE was defined by the user, turn on all the other features. */
149 # undef _ISOC99_SOURCE
150 # define _ISOC99_SOURCE 1
151 # undef _POSIX_SOURCE
152 # define _POSIX_SOURCE 1
153 # undef _POSIX_C_SOURCE
154 # define _POSIX_C_SOURCE 199506L
155 # undef _XOPEN_SOURCE
156 # define _XOPEN_SOURCE 600
157 # undef _XOPEN_SOURCE_EXTENDED
158 # define _XOPEN_SOURCE_EXTENDED 1
159 # undef _LARGEFILE64_SOURCE
160 # define _LARGEFILE64_SOURCE 1
162 # define _BSD_SOURCE 1
164 # define _SVID_SOURCE 1
165 # undef _ATFILE_SOURCE
166 # define _ATFILE_SOURCE 1
169 /* If nothing (other than _GNU_SOURCE) is defined,
170 define _BSD_SOURCE and _SVID_SOURCE. */
171 #if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \
172 !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
173 !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
174 !defined _BSD_SOURCE && !defined _SVID_SOURCE)
175 # define _BSD_SOURCE 1
176 # define _SVID_SOURCE 1
179 /* This is to enable the ISO C99 extension. Also recognize the old macro
180 which was used prior to the standard acceptance. This macro will
181 eventually go away and the features enabled by default once the ISO C99
182 standard is widely adopted. */
183 #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
184 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
185 # define __USE_ISOC99 1
188 /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
189 (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
190 #if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \
191 !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE)
192 # define _POSIX_SOURCE 1
193 # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
194 # define _POSIX_C_SOURCE 2
195 # elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600
196 # define _POSIX_C_SOURCE 199506L
198 # define _POSIX_C_SOURCE 200112L
202 #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
203 # define __USE_POSIX 1
206 #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
207 # define __USE_POSIX2 1
210 #if (_POSIX_C_SOURCE - 0) >= 199309L
211 # define __USE_POSIX199309 1
214 #if (_POSIX_C_SOURCE - 0) >= 199506L
215 # define __USE_POSIX199506 1
218 #if (_POSIX_C_SOURCE - 0) >= 200112L
219 # define __USE_XOPEN2K 1
223 # define __USE_XOPEN 1
224 # if (_XOPEN_SOURCE - 0) >= 500
225 # define __USE_XOPEN_EXTENDED 1
226 # define __USE_UNIX98 1
227 # undef _LARGEFILE_SOURCE
228 # define _LARGEFILE_SOURCE 1
229 # if (_XOPEN_SOURCE - 0) >= 600
230 # define __USE_XOPEN2K 1
232 # define __USE_ISOC99 1
235 # ifdef _XOPEN_SOURCE_EXTENDED
236 # define __USE_XOPEN_EXTENDED 1
241 #ifdef _LARGEFILE_SOURCE
242 # define __USE_LARGEFILE 1
245 #ifdef _LARGEFILE64_SOURCE
246 # define __USE_LARGEFILE64 1
249 #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
250 # define __USE_FILE_OFFSET64 1
253 #if defined _BSD_SOURCE || defined _SVID_SOURCE
254 # define __USE_MISC 1
262 # define __USE_SVID 1
265 #ifdef _ATFILE_SOURCE
266 # define __USE_ATFILE 1
273 #if defined _REENTRANT || defined _THREAD_SAFE
274 # define __USE_REENTRANT 1
277 #if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \
278 && defined __OPTIMIZE__ && __OPTIMIZE__ > 0 \
279 && (__GNUC_PREREQ (4, 1) \
280 || (defined __GNUC_RH_RELEASE__ && __GNUC_PREREQ (4, 0)) \
281 || (defined __GNUC_RH_RELEASE__ && __GNUC_PREREQ (3, 4) \
282 && __GNUC_MINOR__ == 4 \
283 && (__GNUC_PATCHLEVEL__ > 2 \
284 || (__GNUC_PATCHLEVEL__ == 2 && __GNUC_RH_RELEASE__ >= 8))))
285 # if _FORTIFY_SOURCE > 1
286 # define __USE_FORTIFY_LEVEL 2
288 # define __USE_FORTIFY_LEVEL 1
291 # define __USE_FORTIFY_LEVEL 0
294 /* We do support the IEC 559 math functionality, real and complex. */
295 #define __STDC_IEC_559__ 1
296 #define __STDC_IEC_559_COMPLEX__ 1
298 /* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */
299 #define __STDC_ISO_10646__ 200009L
301 /* This macro indicates that the installed library is the GNU C Library.
302 For historic reasons the value now is 6 and this will stay from now
303 on. The use of this variable is deprecated. Use __GLIBC__ and
304 __GLIBC_MINOR__ now (see below) when you want to test for a specific
305 GNU C library version and use the values in <gnu/lib-names.h> to get
306 the sonames of the shared libraries. */
307 #undef __GNU_LIBRARY__
308 #define __GNU_LIBRARY__ 6
310 /* Major and minor version number of the GNU C library package. Use
311 these macros to test for features in specific releases. */
313 #define __GLIBC_MINOR__ 4
315 #define __GLIBC_PREREQ(maj, min) \
316 ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
318 /* Decide whether a compiler supports the long long datatypes. */
319 #if defined __GNUC__ \
320 || (defined __PGI && defined __i386__ ) \
321 || (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \
322 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)
323 # define __GLIBC_HAVE_LONG_LONG 1
326 /* This is here only because every header file already includes this one. */
327 #ifndef __ASSEMBLER__
328 # ifndef _SYS_CDEFS_H
329 # include <sys/cdefs.h>
332 /* If we don't have __REDIRECT, prototypes will be missing if
333 __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
334 # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
335 # define __USE_LARGEFILE 1
336 # define __USE_LARGEFILE64 1
339 #endif /* !ASSEMBLER */
341 /* Decide whether we can define 'extern inline' functions in headers. */
342 #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
343 && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__
344 # define __USE_EXTERN_INLINES 1
348 /* This is here only because every header file already includes this one.
349 Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
350 <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
351 that will always return failure (and set errno to ENOSYS). */
352 #include <gnu/stubs.h>
355 #endif /* features.h */