1/* Copyright (C) 1991-2026 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
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.
8
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.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifndef _FEATURES_H
19#define _FEATURES_H 1
20
21/* These are defined by the user (or the compiler)
22 to specify the desired environment:
23
24 __STRICT_ANSI__ ISO Standard C.
25 _ISOC99_SOURCE Extensions to ISO C89 from ISO C99.
26 _ISOC11_SOURCE Extensions to ISO C99 from ISO C11.
27 _ISOC23_SOURCE Extensions to ISO C99 from ISO C23.
28 _ISOC2X_SOURCE Old name for _ISOC23_SOURCE.
29 _ISOC2Y_SOURCE Extensions to ISO C23 from ISO C2Y.
30 __STDC_WANT_LIB_EXT2__
31 Extensions to ISO C99 from TR 27431-2:2010.
32 __STDC_WANT_IEC_60559_BFP_EXT__
33 Extensions to ISO C11 from TS 18661-1:2014.
34 __STDC_WANT_IEC_60559_FUNCS_EXT__
35 Extensions to ISO C11 from TS 18661-4:2015.
36 __STDC_WANT_IEC_60559_TYPES_EXT__
37 Extensions to ISO C11 from TS 18661-3:2015.
38 __STDC_WANT_IEC_60559_EXT__
39 ISO C23 interfaces defined only in Annex F.
40
41 _POSIX_SOURCE IEEE Std 1003.1.
42 _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
43 if >=199309L, add IEEE Std 1003.1b-1993;
44 if >=199506L, add IEEE Std 1003.1c-1995;
45 if >=200112L, all of IEEE 1003.1-2004
46 if >=200809L, all of IEEE 1003.1-2008
47 if >=202405L, all of IEEE 1003.1-2024
48 _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
49 Single Unix conformance is wanted, to 600 for the
50 sixth revision, to 700 for the seventh revision,
51 to 800 for the eighth revision.
52 _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
53 _LARGEFILE_SOURCE Some more functions for correct standard I/O.
54 _LARGEFILE64_SOURCE Additional functionality from LFS for large files.
55 _FILE_OFFSET_BITS=N Select default filesystem interface.
56 _ATFILE_SOURCE Additional *at interfaces.
57 _DYNAMIC_STACK_SIZE_SOURCE Select correct (but non compile-time constant)
58 MINSIGSTKSZ, SIGSTKSZ and PTHREAD_STACK_MIN.
59 _GNU_SOURCE All of the above, plus GNU extensions.
60 _DEFAULT_SOURCE The default set of features (taking precedence over
61 __STRICT_ANSI__).
62
63 _FORTIFY_SOURCE Add security hardening to many library functions.
64 Set to 1, 2 or 3; 3 performs stricter checks than 2, which
65 performs stricter checks than 1.
66
67 _REENTRANT, _THREAD_SAFE
68 Obsolete; equivalent to _POSIX_C_SOURCE=199506L.
69
70 The `-ansi' switch to the GNU C compiler, and standards conformance
71 options such as `-std=c99', define __STRICT_ANSI__. If none of
72 these are defined, or if _DEFAULT_SOURCE is defined, the default is
73 to have _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
74 202405L, as well as enabling miscellaneous functions from BSD and
75 SVID. If more than one of these are defined, they accumulate. For
76 example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE together
77 give you ISO C, 1003.1, and 1003.2, but nothing else.
78
79 These are defined by this file and are used by the
80 header files to decide what to declare or define:
81
82 __GLIBC_USE (F) Define things from feature set F. This is defined
83 to 1 or 0; the subsequent macros are either defined
84 or undefined, and those tests should be moved to
85 __GLIBC_USE.
86 __USE_ISOC11 Define ISO C11 things.
87 __USE_ISOC99 Define ISO C99 things.
88 __USE_ISOC95 Define ISO C90 AMD1 (C95) things.
89 __USE_ISOCXX11 Define ISO C++11 things.
90 __USE_POSIX Define IEEE Std 1003.1 things.
91 __USE_POSIX2 Define IEEE Std 1003.2 things.
92 __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things.
93 __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
94 __USE_XOPEN Define XPG things.
95 __USE_XOPEN_EXTENDED Define X/Open Unix things.
96 __USE_UNIX98 Define Single Unix V2 things.
97 __USE_XOPEN2K Define XPG6 things.
98 __USE_XOPEN2KXSI Define XPG6 XSI things.
99 __USE_XOPEN2K8 Define XPG7 things.
100 __USE_XOPEN2K8XSI Define XPG7 XSI things.
101 __USE_XOPEN2K24 Define XPG8 things.
102 __USE_XOPEN2K24XSI Define XPG8 XSI things.
103 __USE_LARGEFILE Define correct standard I/O things.
104 __USE_LARGEFILE64 Define LFS things with separate names.
105 __USE_FILE_OFFSET64 Define 64bit interface as default.
106 __USE_MISC Define things from 4.3BSD or System V Unix.
107 __USE_ATFILE Define *at interfaces and AT_* constants for them.
108 __USE_DYNAMIC_STACK_SIZE Define correct (but non compile-time constant)
109 MINSIGSTKSZ, SIGSTKSZ and PTHREAD_STACK_MIN.
110 __USE_GNU Define GNU extensions.
111 __USE_FORTIFY_LEVEL Additional security measures used, according to level.
112
113 The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
114 defined by this file unconditionally. `__GNU_LIBRARY__' is provided
115 only for compatibility. All new code should use the other symbols
116 to test for features.
117
118 All macros listed above as possibly being defined by this file are
119 explicitly undefined if they are not explicitly defined.
120 Feature-test macros that are not defined by the user or compiler
121 but are implied by the other feature-test macros defined (or by the
122 lack of any definitions) are defined by the file.
123
124 ISO C feature test macros depend on the definition of the macro
125 when an affected header is included, not when the first system
126 header is included, and so they are handled in
127 <bits/libc-header-start.h>, which does not have a multiple include
128 guard. Feature test macros that can be handled from the first
129 system header included are handled here. */
130
131
132/* Undefine everything, so we get a clean slate. */
133#undef __USE_ISOC11
134#undef __USE_ISOC99
135#undef __USE_ISOC95
136#undef __USE_ISOCXX11
137#undef __USE_POSIX
138#undef __USE_POSIX2
139#undef __USE_POSIX199309
140#undef __USE_POSIX199506
141#undef __USE_XOPEN
142#undef __USE_XOPEN_EXTENDED
143#undef __USE_UNIX98
144#undef __USE_XOPEN2K
145#undef __USE_XOPEN2KXSI
146#undef __USE_XOPEN2K8
147#undef __USE_XOPEN2K8XSI
148#undef __USE_XOPEN2K24
149#undef __USE_XOPEN2K24XSI
150#undef __USE_LARGEFILE
151#undef __USE_LARGEFILE64
152#undef __USE_FILE_OFFSET64
153#undef __USE_MISC
154#undef __USE_ATFILE
155#undef __USE_DYNAMIC_STACK_SIZE
156#undef __USE_GNU
157#undef __USE_FORTIFY_LEVEL
158#undef __KERNEL_STRICT_NAMES
159#undef __GLIBC_USE_ISOC23
160#undef __GLIBC_USE_ISOC2Y
161#undef __GLIBC_USE_DEPRECATED_GETS
162#undef __GLIBC_USE_DEPRECATED_SCANF
163#undef __GLIBC_USE_C23_STRTOL
164
165/* Suppress kernel-name space pollution unless user explicitly asks
166 for it. */
167#ifndef _LOOSE_KERNEL_NAMES
168# define __KERNEL_STRICT_NAMES
169#endif
170
171/* Convenience macro to test the version of gcc.
172 Use like this:
173 #if __GNUC_PREREQ (2,8)
174 ... code requiring gcc 2.8 or later ...
175 #endif
176 Note: only works for GCC 2.0 and later, because __GNUC_MINOR__ was
177 added in 2.0. */
178#if defined __GNUC__ && defined __GNUC_MINOR__
179# define __GNUC_PREREQ(maj, min) \
180 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
181#else
182# define __GNUC_PREREQ(maj, min) 0
183#endif
184
185/* Similarly for clang. Features added to GCC after version 4.2 may
186 or may not also be available in clang, and clang's definitions of
187 __GNUC(_MINOR)__ are fixed at 4 and 2 respectively. Not all such
188 features can be queried via __has_extension/__has_feature. */
189#if defined __clang_major__ && defined __clang_minor__
190# define __glibc_clang_prereq(maj, min) \
191 ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
192#else
193# define __glibc_clang_prereq(maj, min) 0
194#endif
195
196/* Whether to use feature set F. */
197#define __GLIBC_USE(F) __GLIBC_USE_ ## F
198
199/* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for
200 _DEFAULT_SOURCE. If _DEFAULT_SOURCE is present we do not
201 issue a warning; the expectation is that the source is being
202 transitioned to use the new macro. */
203#if (defined _BSD_SOURCE || defined _SVID_SOURCE) \
204 && !defined _DEFAULT_SOURCE
205# warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
206# undef _DEFAULT_SOURCE
207# define _DEFAULT_SOURCE 1
208#endif
209
210/* Remap the old name _ISOC2X_SOURCE to _ISOC23_SOURCE. */
211#ifdef _ISOC2X_SOURCE
212# undef _ISOC2X_SOURCE
213# undef _ISOC23_SOURCE
214# define _ISOC23_SOURCE 1
215#endif
216
217/* If _GNU_SOURCE was defined by the user, turn on all the other features. */
218#ifdef _GNU_SOURCE
219# undef _ISOC95_SOURCE
220# define _ISOC95_SOURCE 1
221# undef _ISOC99_SOURCE
222# define _ISOC99_SOURCE 1
223# undef _ISOC11_SOURCE
224# define _ISOC11_SOURCE 1
225# undef _ISOC23_SOURCE
226# define _ISOC23_SOURCE 1
227# undef _ISOC2Y_SOURCE
228# define _ISOC2Y_SOURCE 1
229# undef _POSIX_SOURCE
230# define _POSIX_SOURCE 1
231# undef _POSIX_C_SOURCE
232# define _POSIX_C_SOURCE 202405L
233# undef _XOPEN_SOURCE
234# define _XOPEN_SOURCE 800
235# undef _XOPEN_SOURCE_EXTENDED
236# define _XOPEN_SOURCE_EXTENDED 1
237# undef _LARGEFILE64_SOURCE
238# define _LARGEFILE64_SOURCE 1
239# undef _DEFAULT_SOURCE
240# define _DEFAULT_SOURCE 1
241# undef _ATFILE_SOURCE
242# define _ATFILE_SOURCE 1
243# undef _DYNAMIC_STACK_SIZE_SOURCE
244# define _DYNAMIC_STACK_SIZE_SOURCE 1
245#endif
246
247/* If nothing (other than _GNU_SOURCE and _DEFAULT_SOURCE) is defined,
248 define _DEFAULT_SOURCE. */
249#if (defined _DEFAULT_SOURCE \
250 || (!defined __STRICT_ANSI__ \
251 && !defined _ISOC99_SOURCE && !defined _ISOC11_SOURCE \
252 && !defined _ISOC23_SOURCE && !defined _ISOC2Y_SOURCE \
253 && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE \
254 && !defined _XOPEN_SOURCE))
255# undef _DEFAULT_SOURCE
256# define _DEFAULT_SOURCE 1
257#endif
258
259/* This is to enable the ISO C2Y extension. */
260#if (defined _ISOC2Y_SOURCE \
261 || (defined __STDC_VERSION__ && __STDC_VERSION__ > 202311L))
262# define __GLIBC_USE_ISOC2Y 1
263#else
264# define __GLIBC_USE_ISOC2Y 0
265#endif
266
267/* This is to enable the ISO C23 extension. */
268#if (defined _ISOC23_SOURCE || defined _ISOC2Y_SOURCE \
269 || (defined __STDC_VERSION__ && __STDC_VERSION__ > 201710L))
270# define __GLIBC_USE_ISOC23 1
271#else
272# define __GLIBC_USE_ISOC23 0
273#endif
274
275/* This is to enable the ISO C11 extension. */
276#if (defined _ISOC11_SOURCE || defined _ISOC23_SOURCE \
277 || defined _ISOC2Y_SOURCE \
278 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L))
279# define __USE_ISOC11 1
280#endif
281
282/* This is to enable the ISO C99 extension. */
283#if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \
284 || defined _ISOC23_SOURCE || defined _ISOC2Y_SOURCE \
285 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
286# define __USE_ISOC99 1
287#endif
288
289/* This is to enable the ISO C90 Amendment 1:1995 extension. */
290#if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \
291 || defined _ISOC23_SOURCE || defined _ISOC2Y_SOURCE \
292 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L))
293# define __USE_ISOC95 1
294#endif
295
296#ifdef __cplusplus
297/* This is to enable compatibility for ISO C++17. */
298# if __cplusplus >= 201703L
299# define __USE_ISOC11 1
300# endif
301/* This is to enable compatibility for ISO C++11.
302 Check the temporary macro for now, too. */
303# if __cplusplus >= 201103L || defined __GXX_EXPERIMENTAL_CXX0X__
304# define __USE_ISOCXX11 1
305# define __USE_ISOC99 1
306# endif
307#endif
308
309/* If none of the ANSI/POSIX macros are defined, or if _DEFAULT_SOURCE
310 is defined, use POSIX.1-2024 (or another version depending on
311 _XOPEN_SOURCE). */
312#ifdef _DEFAULT_SOURCE
313# if !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE
314# define __USE_POSIX_IMPLICITLY 1
315# endif
316# undef _POSIX_SOURCE
317# define _POSIX_SOURCE 1
318# undef _POSIX_C_SOURCE
319# define _POSIX_C_SOURCE 202405L
320#endif
321
322#if ((!defined __STRICT_ANSI__ \
323 || (defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >= 500)) \
324 && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE)
325# define _POSIX_SOURCE 1
326# if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
327# define _POSIX_C_SOURCE 2
328# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600
329# define _POSIX_C_SOURCE 199506L
330# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700
331# define _POSIX_C_SOURCE 200112L
332# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 800
333# define _POSIX_C_SOURCE 200809L
334# else
335# define _POSIX_C_SOURCE 202405L
336# endif
337# define __USE_POSIX_IMPLICITLY 1
338#endif
339
340/* Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
341 defined in all multithreaded code. GNU libc has not required this
342 for many years. We now treat them as compatibility synonyms for
343 _POSIX_C_SOURCE=199506L, which is the earliest level of POSIX with
344 comprehensive support for multithreaded code. Using them never
345 lowers the selected level of POSIX conformance, only raises it. */
346#if ((!defined _POSIX_C_SOURCE || (_POSIX_C_SOURCE - 0) < 199506L) \
347 && (defined _REENTRANT || defined _THREAD_SAFE))
348# define _POSIX_SOURCE 1
349# undef _POSIX_C_SOURCE
350# define _POSIX_C_SOURCE 199506L
351#endif
352
353#if (defined _POSIX_SOURCE \
354 || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1) \
355 || defined _XOPEN_SOURCE)
356# define __USE_POSIX 1
357#endif
358
359#if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
360# define __USE_POSIX2 1
361#endif
362
363#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199309L
364# define __USE_POSIX199309 1
365#endif
366
367#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L
368# define __USE_POSIX199506 1
369#endif
370
371#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L
372# define __USE_XOPEN2K 1
373# undef __USE_ISOC95
374# define __USE_ISOC95 1
375# undef __USE_ISOC99
376# define __USE_ISOC99 1
377#endif
378
379#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200809L
380# define __USE_XOPEN2K8 1
381# undef _ATFILE_SOURCE
382# define _ATFILE_SOURCE 1
383#endif
384
385#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 202405L
386# define __USE_XOPEN2K24 1
387#endif
388
389#ifdef _XOPEN_SOURCE
390# define __USE_XOPEN 1
391# if (_XOPEN_SOURCE - 0) >= 500
392# define __USE_XOPEN_EXTENDED 1
393# define __USE_UNIX98 1
394# undef _LARGEFILE_SOURCE
395# define _LARGEFILE_SOURCE 1
396# if (_XOPEN_SOURCE - 0) >= 600
397# if (_XOPEN_SOURCE - 0) >= 700
398# define __USE_XOPEN2K8 1
399# define __USE_XOPEN2K8XSI 1
400# if (_XOPEN_SOURCE - 0) >= 800
401# define __USE_XOPEN2K24 1
402# define __USE_XOPEN2K24XSI 1
403# endif
404# endif
405# define __USE_XOPEN2K 1
406# define __USE_XOPEN2KXSI 1
407# undef __USE_ISOC95
408# define __USE_ISOC95 1
409# undef __USE_ISOC99
410# define __USE_ISOC99 1
411# endif
412# else
413# ifdef _XOPEN_SOURCE_EXTENDED
414# define __USE_XOPEN_EXTENDED 1
415# endif
416# endif
417#endif
418
419#ifdef _LARGEFILE_SOURCE
420# define __USE_LARGEFILE 1
421#endif
422
423#ifdef _LARGEFILE64_SOURCE
424# define __USE_LARGEFILE64 1
425#endif
426
427#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
428# define __USE_FILE_OFFSET64 1
429#endif
430
431#include <features-time64.h>
432
433#if defined _DEFAULT_SOURCE
434# define __USE_MISC 1
435#endif
436
437#ifdef _ATFILE_SOURCE
438# define __USE_ATFILE 1
439#endif
440
441#ifdef _DYNAMIC_STACK_SIZE_SOURCE
442# define __USE_DYNAMIC_STACK_SIZE 1
443#endif
444
445#ifdef _GNU_SOURCE
446# define __USE_GNU 1
447#endif
448
449#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0
450# if !defined __OPTIMIZE__ || __OPTIMIZE__ <= 0
451# warning _FORTIFY_SOURCE requires compiling with optimization (-O)
452# elif !__GNUC_PREREQ (4, 1)
453# warning _FORTIFY_SOURCE requires GCC 4.1 or later
454# elif _FORTIFY_SOURCE > 2 && (__glibc_clang_prereq (9, 0) \
455 || __GNUC_PREREQ (12, 0))
456
457# if _FORTIFY_SOURCE > 3
458# warning _FORTIFY_SOURCE > 3 is treated like 3 on this platform
459# endif
460# define __USE_FORTIFY_LEVEL 3
461# elif _FORTIFY_SOURCE > 1
462# if _FORTIFY_SOURCE > 2
463# warning _FORTIFY_SOURCE > 2 is treated like 2 on this platform
464# endif
465# define __USE_FORTIFY_LEVEL 2
466# else
467# define __USE_FORTIFY_LEVEL 1
468# endif
469#endif
470#ifndef __USE_FORTIFY_LEVEL
471# define __USE_FORTIFY_LEVEL 0
472#endif
473
474/* The function 'gets' existed in C89, but is impossible to use
475 safely. It has been removed from ISO C11 and ISO C++14. Note: for
476 compatibility with various implementations of <cstdio>, this test
477 must consider only the value of __cplusplus when compiling C++. */
478#if defined __cplusplus ? __cplusplus >= 201402L : defined __USE_ISOC11
479# define __GLIBC_USE_DEPRECATED_GETS 0
480#else
481# define __GLIBC_USE_DEPRECATED_GETS 1
482#endif
483
484/* GNU formerly extended the scanf functions with modified format
485 specifiers %as, %aS, and %a[...] that allocate a buffer for the
486 input using malloc. This extension conflicts with ISO C99, which
487 defines %a as a standalone format specifier that reads a floating-
488 point number; moreover, POSIX.1-2008 provides the same feature
489 using the modifier letter 'm' instead (%ms, %mS, %m[...]).
490
491 We now follow C99 unless GNU extensions are active and the compiler
492 is specifically in C89 or C++98 mode (strict or not). For
493 instance, with GCC, -std=gnu11 will have C99-compliant scanf with
494 or without -D_GNU_SOURCE, but -std=c89 -D_GNU_SOURCE will have the
495 old extension. */
496#if (defined __USE_GNU \
497 && (defined __cplusplus \
498 ? (__cplusplus < 201103L && !defined __GXX_EXPERIMENTAL_CXX0X__) \
499 : (!defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L)))
500# define __GLIBC_USE_DEPRECATED_SCANF 1
501#else
502# define __GLIBC_USE_DEPRECATED_SCANF 0
503#endif
504
505/* ISO C23 added support for a 0b or 0B prefix on binary constants as
506 inputs to strtol-family functions (base 0 or 2). This macro is
507 used to condition redirection in headers to allow that redirection
508 to be disabled when building those functions, despite _GNU_SOURCE
509 being defined. */
510#if __GLIBC_USE (ISOC23)
511# define __GLIBC_USE_C23_STRTOL 1
512#else
513# define __GLIBC_USE_C23_STRTOL 0
514#endif
515
516/* Get definitions of __STDC_* predefined macros, if the compiler has
517 not preincluded this header automatically. */
518#include <stdc-predef.h>
519
520/* This macro indicates that the installed library is the GNU C Library.
521 For historic reasons the value now is 6 and this will stay from now
522 on. The use of this variable is deprecated. Use __GLIBC__ and
523 __GLIBC_MINOR__ now (see below) when you want to test for a specific
524 GNU C library version and use the values in <gnu/lib-names.h> to get
525 the sonames of the shared libraries. */
526#undef __GNU_LIBRARY__
527#define __GNU_LIBRARY__ 6
528
529/* Major and minor version number of the GNU C library package. Use
530 these macros to test for features in specific releases. */
531#define __GLIBC__ 2
532#define __GLIBC_MINOR__ 43
533
534#define __GLIBC_PREREQ(maj, min) \
535 ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
536
537/* This is here only because every header file already includes this one. */
538#ifndef __ASSEMBLER__
539# ifndef _SYS_CDEFS_H
540# include <sys/cdefs.h>
541# endif
542
543/* If we don't have __REDIRECT, prototypes will be missing if
544 __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
545# if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
546# define __USE_LARGEFILE 1
547# define __USE_LARGEFILE64 1
548# endif
549
550#endif /* !ASSEMBLER */
551
552/* Decide whether we can define 'extern inline' functions in headers. */
553#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
554 && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \
555 && defined __extern_inline && !(defined __clang__ && defined _LIBC)
556# define __USE_EXTERN_INLINES 1
557#endif
558
559
560/* This is here only because every header file already includes this one.
561 Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
562 <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
563 that will always return failure (and set errno to ENOSYS). */
564#include <gnu/stubs.h>
565
566
567#endif /* features.h */
568