1 /* Copyright (C) 1991,92,93,95,96,97,98,99,2000,2001 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 Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the 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 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 /* For uClibc, always optimize for size -- this should disable
23 * a lot of expensive inlining... */
24 #define __OPTIMIZE_SIZE__ 1
26 /* These are defined by the user (or the compiler)
27 to specify the desired environment:
29 __STRICT_ANSI__ ISO Standard C.
30 _ISOC99_SOURCE Extensions to ISO C89 from ISO C99.
31 _POSIX_SOURCE IEEE Std 1003.1.
32 _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
33 if >=199309L, add IEEE Std 1003.1b-1993;
34 if >=199506L, add IEEE Std 1003.1c-1995
35 _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
36 Single Unix conformance is wanted, to 600 for the
37 upcoming sixth revision.
38 _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
39 _LARGEFILE_SOURCE Some more functions for correct standard I/O.
40 _LARGEFILE64_SOURCE Additional functionality from LFS for large files.
41 _FILE_OFFSET_BITS=N Select default filesystem interface.
42 _BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
43 _SVID_SOURCE ISO C, POSIX, and SVID things.
44 _GNU_SOURCE All of the above, plus GNU extensions.
45 _REENTRANT Select additionally reentrant object.
46 _THREAD_SAFE Same as _REENTRANT, often used by other systems.
48 The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
49 If none of these are defined, the default is to have _SVID_SOURCE,
50 _BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
51 199506L. If more than one of these are defined, they accumulate.
52 For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
53 together give you ISO C, 1003.1, and 1003.2, but nothing else.
55 These are defined by this file and are used by the
56 header files to decide what to declare or define:
58 __USE_ISOC99 Define ISO C99 things.
59 __USE_POSIX Define IEEE Std 1003.1 things.
60 __USE_POSIX2 Define IEEE Std 1003.2 things.
61 __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
62 __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
63 __USE_XOPEN Define XPG things.
64 __USE_XOPEN_EXTENDED Define X/Open Unix things.
65 __USE_UNIX98 Define Single Unix V2 things.
66 __USE_XOPEN2K Define XPG6 things.
67 __USE_LARGEFILE Define correct standard I/O things.
68 __USE_LARGEFILE64 Define LFS things with separate names.
69 __USE_FILE_OFFSET64 Define 64bit interface as default.
70 __USE_BSD Define 4.3BSD things.
71 __USE_SVID Define SVID things.
72 __USE_MISC Define things common to BSD and System V Unix.
73 __USE_GNU Define GNU extensions.
74 __USE_REENTRANT Define reentrant/thread-safe *_r functions.
75 __FAVOR_BSD Favor 4.3BSD things in cases of conflict.
77 The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
78 defined by this file unconditionally. `__GNU_LIBRARY__' is provided
79 only for compatibility. All new code should use the other symbols
82 All macros listed above as possibly being defined by this file are
83 explicitly undefined if they are not explicitly defined.
84 Feature-test macros that are not defined by the user or compiler
85 but are implied by the other feature-test macros defined (or by the
86 lack of any definitions) are defined by the file. */
88 /* First, record if user requested some form of large file support. */
89 #if defined(_LARGEFILE_SOURCE) || defined(_LARGEFILE64_SOURCE) \
90 || (defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64)
91 # define __USER_REQUESTED_LFS_OPTION 1
94 /* Undefine everything, so we get a clean slate. */
98 #undef __USE_POSIX199309
99 #undef __USE_POSIX199506
101 #undef __USE_XOPEN_EXTENDED
104 #undef __USE_LARGEFILE
105 #undef __USE_LARGEFILE64
106 #undef __USE_FILE_OFFSET64
111 #undef __USE_REENTRANT
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. */
125 /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
126 #if defined _BSD_SOURCE && \
127 !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
128 defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
129 defined _GNU_SOURCE || defined _SVID_SOURCE)
130 # define __FAVOR_BSD 1
133 /* If _GNU_SOURCE was defined by the user, turn on all the other features. */
135 # undef _ISOC99_SOURCE
136 # define _ISOC99_SOURCE 1
137 # undef _POSIX_SOURCE
138 # define _POSIX_SOURCE 1
139 # undef _POSIX_C_SOURCE
140 # define _POSIX_C_SOURCE 199506L
141 # undef _XOPEN_SOURCE
142 # define _XOPEN_SOURCE 600
143 # undef _XOPEN_SOURCE_EXTENDED
144 # define _XOPEN_SOURCE_EXTENDED 1
145 # undef _LARGEFILE64_SOURCE
146 # define _LARGEFILE64_SOURCE 1
148 # define _BSD_SOURCE 1
150 # define _SVID_SOURCE 1
153 /* If nothing (other than _GNU_SOURCE) is defined,
154 define _BSD_SOURCE and _SVID_SOURCE. */
155 #if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \
156 !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
157 !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
158 !defined _BSD_SOURCE && !defined _SVID_SOURCE)
159 # define _BSD_SOURCE 1
160 # define _SVID_SOURCE 1
163 /* This is to enable the ISO C99 extension. Also recognize the old macro
164 which was used prior to the standard acceptance. This macro will
165 eventually go away and the features enabled by default once the ISO C99
166 standard is widely adopted. */
167 #if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
168 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
169 # define __USE_ISOC99 1
172 /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
173 (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
174 #if (!defined __STRICT_ANSI__ && !defined _POSIX_SOURCE && \
175 !defined _POSIX_C_SOURCE)
176 # define _POSIX_SOURCE 1
177 # if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
178 # define _POSIX_C_SOURCE 2
180 # define _POSIX_C_SOURCE 199506L
184 #if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
185 # define __USE_POSIX 1
188 #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
189 # define __USE_POSIX2 1
192 #if (_POSIX_C_SOURCE - 0) >= 199309L
193 # define __USE_POSIX199309 1
196 #if (_POSIX_C_SOURCE - 0) >= 199506L
197 # define __USE_POSIX199506 1
201 # define __USE_XOPEN 1
202 # if (_XOPEN_SOURCE - 0) >= 500
203 # define __USE_XOPEN_EXTENDED 1
204 # define __USE_UNIX98 1
205 # undef _LARGEFILE_SOURCE
206 # define _LARGEFILE_SOURCE 1
207 # if (_XOPEN_SOURCE - 0) >= 600
208 # define __USE_XOPEN2K 1
210 # define __USE_ISOC99 1
213 # ifdef _XOPEN_SOURCE_EXTENDED
214 # define __USE_XOPEN_EXTENDED 1
219 #ifdef _LARGEFILE_SOURCE
220 # define __USE_LARGEFILE 1
223 #ifdef _LARGEFILE64_SOURCE
224 # define __USE_LARGEFILE64 1
227 #if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
228 # define __USE_FILE_OFFSET64 1
231 #if defined _BSD_SOURCE || defined _SVID_SOURCE
232 # define __USE_MISC 1
240 # define __USE_SVID 1
247 #if defined _REENTRANT || defined _THREAD_SAFE
248 # define __USE_REENTRANT 1
251 /* We do support the IEC 559 math functionality, real and complex. */
252 #define __STDC_IEC_559__ 1
253 #define __STDC_IEC_559_COMPLEX__ 1
255 /* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.0. */
256 #define __STDC_ISO_10646__ 200009L
258 /* Major and minor version number of the uClibc library package. Use
259 these macros to test for features in specific releases. */
261 #define __UCLIBC_MAJOR__ 9
262 #define __UCLIBC_MINOR__ 5
264 /* There is an unwholesomely huge amount of code out there that depends on the
265 * presence of GNU libc header files. We have GNU libc header files. So here
266 * we commit a horrible sin. At this point, we _lie_ and claim to be GNU libc
267 * to make things like /usr/include/linux/socket.h and lots of apps work as
268 * their developers intended. This is IMHO, pardonable, since these defines
269 * are not really intended to check for the presence of a particular library,
270 * but rather are used to define an _interface_. */
271 #if !defined __FORCE_NOGLIBC && (!defined _LIBC || defined __FORCE_GLIBC)
272 # define __GNU_LIBRARY__ 6
274 # define __GLIBC_MINOR__ 2
277 /* Convenience macros to test the versions of glibc and gcc.
279 #if __GNUC_PREREQ (2,8)
280 ... code requiring gcc 2.8 or later ...
282 Note - they won't work for gcc1 or glibc1, since the _MINOR macros
283 were not defined then. */
284 #if defined __GNUC__ && defined __GNUC_MINOR__
285 # define __GNUC_PREREQ(maj, min) \
286 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
288 # define __GNUC_PREREQ(maj, min) 0
291 #define __GLIBC_PREREQ(maj, min) \
292 ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
294 /* This is here only because every header file already includes this one. */
295 #ifndef __ASSEMBLER__
297 # include <sys/cdefs.h>
300 /* If we don't have __REDIRECT, prototypes will be missing if
301 __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
302 # if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
303 # define __USE_LARGEFILE 1
304 # define __USE_LARGEFILE64 1
307 #endif /* !ASSEMBLER */
309 /* Decide whether we can define 'extern inline' functions in headers. */
310 #if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
311 && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__
312 # define __USE_EXTERN_INLINES 1
315 /* This is here only because every header file already includes this one. */
318 /* Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
319 <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
320 which will always return failure (and set errno to ENOSYS).
322 We avoid including <gnu/stubs.h> when compiling the C library itself to
323 avoid a dependency loop. stubs.h depends on every object file. If
324 this #include were done for the library source code, then every object
325 file would depend on stubs.h. */
327 # include <gnu/stubs.h>
331 #define __BEGIN_DECLS
334 /* Load up the current set of uClibc supported features */
335 #define __need_uClibc_config_h
336 #include <bits/uClibc_config.h>
337 #undef __need_uClibc_config_h
339 /* Make sure users large file options agree with uClibc's configuration. */
340 #ifndef __UCLIBC_HAVE_LFS__
341 /* If uClibc was built without large file support, output an error if
342 * large file functions are requested. */
343 #ifdef __USER_REQUESTED_LFS_OPTION
344 #error uClibc was configured without large file support...
345 /* Since _LARGEFILE_SOURCE and _LARGEFILE64_SOURCE can be turned by
346 * other options, disable them with a warning if they were enabled. */
347 #elif defined(_LARGEFILE_SOURCE) || defined(_LARGEFILE64_SOURCE)
348 #warning uClibc was configured without large file support...
350 #undef _LARGEFILE_SOURCE
351 #undef _LARGEFILE64_SOURCE
352 #undef _FILE_OFFSET_BITS
353 #undef __USE_LARGEFILE
354 #undef __USE_LARGEFILE64
355 #undef __USE_FILE_OFFSET64
356 /* If we're actually building uClibc with large file support,
357 * define __USE_LARGEFILE64 only. */
359 #undef _LARGEFILE_SOURCE
360 #undef _LARGEFILE64_SOURCE
361 #undef _FILE_OFFSET_BITS
362 #undef __USE_LARGEFILE
363 #undef __USE_LARGEFILE64
364 #undef __USE_FILE_OFFSET64
365 #define __USE_LARGEFILE64 1
368 /* Some nice features only work properly with ELF */
369 #if defined _LIBC && defined HAVE_ELF
370 /* Define ALIASNAME as a weak alias for NAME. */
371 # define weak_alias(name, aliasname) _weak_alias (name, aliasname)
372 # define _weak_alias(name, aliasname) \
373 extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
374 /* Define ALIASNAME as a strong alias for NAME. */
375 # define strong_alias(name, aliasname) _strong_alias(name, aliasname)
376 # define _strong_alias(name, aliasname) \
377 extern __typeof (name) aliasname __attribute__ ((alias (#name)));
378 /* This comes between the return type and function name in
379 * a function definition to make that definition weak. */
380 # define weak_function __attribute__ ((weak))
381 /* Tacking on "\n\t#" to the section name makes gcc put it's bogus
382 * section attributes on what looks like a comment to the assembler. */
383 # define link_warning(symbol, msg) \
384 asm (".section " ".gnu.warning." #symbol "\n\t.previous"); \
385 static const char __evoke_link_warning_##symbol[] \
386 __attribute__ ((section (".gnu.warning." #symbol "\n\t#"))) = msg;
388 # define strong_alias(name, aliasname) _strong_alias (name, aliasname)
389 # define weak_alias(name, aliasname) _strong_alias (name, aliasname)
390 # define _strong_alias(name, aliasname) \
391 __asm__(".global _" #aliasname "\n.set _" #aliasname ",_" #name);
392 # define link_warning(symbol, msg) \
393 asm (".stabs \"" msg "\",30,0,0,0\n\t" \
394 ".stabs \"" #symbol "\",1,0,0,0\n");
397 /* --- this is added to integrate linuxthreads */
399 #define __USE_UNIX98 1
402 #ifndef weak_function
403 /* If we do not have the __attribute__ ((weak)) syntax, there is no way we
404 can define functions as weak symbols. The compiler will emit a `.globl'
405 directive for the function symbol, and a `.weak' directive in addition
406 will produce an error from the assembler. */
407 # define weak_function /* empty */
408 # define weak_const_function /* empty */
411 /* On some platforms we can make internal function calls (i.e., calls of
412 functions not exported) a bit faster by using a different calling
414 #ifndef internal_function
415 # define internal_function /* empty */
418 /* Prepare for the case that `__builtin_expect' is not available. */
419 #ifndef HAVE_BUILTIN_EXPECT
420 # define __builtin_expect(expr, val) (expr)
424 #endif /* features.h */