FreeBSD/Linux Kernel Cross Reference
sys/sys/cdefs.h
1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Berkeley Software Design, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95
33 * $FreeBSD: releng/9.1/sys/sys/cdefs.h 237665 2012-06-27 21:18:47Z jkim $
34 */
35
36 #ifndef _SYS_CDEFS_H_
37 #define _SYS_CDEFS_H_
38
39 #if defined(__cplusplus)
40 #define __BEGIN_DECLS extern "C" {
41 #define __END_DECLS }
42 #else
43 #define __BEGIN_DECLS
44 #define __END_DECLS
45 #endif
46
47 /*
48 * This code has been put in place to help reduce the addition of
49 * compiler specific defines in FreeBSD code. It helps to aid in
50 * having a compiler-agnostic source tree.
51 */
52
53 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
54
55 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
56 #define __GNUCLIKE_ASM 3
57 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
58 #else
59 #define __GNUCLIKE_ASM 2
60 #endif
61 #define __GNUCLIKE___TYPEOF 1
62 #define __GNUCLIKE___OFFSETOF 1
63 #define __GNUCLIKE___SECTION 1
64
65 #ifndef __INTEL_COMPILER
66 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
67 #endif
68
69 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
70 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
71 && __INTEL_COMPILER < 800
72 # undef __GNUCLIKE_BUILTIN_CONSTANT_P
73 # endif
74
75 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) && !defined(__INTEL_COMPILER)
76 # define __GNUCLIKE_BUILTIN_VARARGS 1
77 # define __GNUCLIKE_BUILTIN_STDARG 1
78 # define __GNUCLIKE_BUILTIN_VAALIST 1
79 #endif
80
81 #if defined(__GNUC__)
82 # define __GNUC_VA_LIST_COMPATIBILITY 1
83 #endif
84
85 #ifndef __INTEL_COMPILER
86 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
87 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
88 #endif
89
90 #define __GNUCLIKE_BUILTIN_MEMCPY 1
91
92 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
93 #define __CC_SUPPORTS_INLINE 1
94 #define __CC_SUPPORTS___INLINE 1
95 #define __CC_SUPPORTS___INLINE__ 1
96
97 #define __CC_SUPPORTS___FUNC__ 1
98 #define __CC_SUPPORTS_WARNING 1
99
100 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
101
102 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
103
104 #endif /* __GNUC__ || __INTEL_COMPILER */
105
106 /*
107 * Macro to test if we're using a specific version of gcc or later.
108 */
109 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
110 #define __GNUC_PREREQ__(ma, mi) \
111 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
112 #else
113 #define __GNUC_PREREQ__(ma, mi) 0
114 #endif
115
116 /*
117 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
118 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
119 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
120 * mode -- there must be no spaces between its arguments, and for nested
121 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
122 * concatenate double-quoted strings produced by the __STRING macro, but
123 * this only works with ANSI C.
124 *
125 * __XSTRING is like __STRING, but it expands any macros in its argument
126 * first. It is only available with ANSI C.
127 */
128 #if defined(__STDC__) || defined(__cplusplus)
129 #define __P(protos) protos /* full-blown ANSI C */
130 #define __CONCAT1(x,y) x ## y
131 #define __CONCAT(x,y) __CONCAT1(x,y)
132 #define __STRING(x) #x /* stringify without expanding x */
133 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
134
135 #define __const const /* define reserved names to standard */
136 #define __signed signed
137 #define __volatile volatile
138 #if defined(__cplusplus)
139 #define __inline inline /* convert to C++ keyword */
140 #else
141 #if !(defined(__CC_SUPPORTS___INLINE))
142 #define __inline /* delete GCC keyword */
143 #endif /* ! __CC_SUPPORTS___INLINE */
144 #endif /* !__cplusplus */
145
146 #else /* !(__STDC__ || __cplusplus) */
147 #define __P(protos) () /* traditional C preprocessor */
148 #define __CONCAT(x,y) x/**/y
149 #define __STRING(x) "x"
150
151 #if !defined(__CC_SUPPORTS___INLINE)
152 #define __const /* delete pseudo-ANSI C keywords */
153 #define __inline
154 #define __signed
155 #define __volatile
156 /*
157 * In non-ANSI C environments, new programs will want ANSI-only C keywords
158 * deleted from the program and old programs will want them left alone.
159 * When using a compiler other than gcc, programs using the ANSI C keywords
160 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
161 * When using "gcc -traditional", we assume that this is the intent; if
162 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
163 */
164 #ifndef NO_ANSI_KEYWORDS
165 #define const /* delete ANSI C keywords */
166 #define inline
167 #define signed
168 #define volatile
169 #endif /* !NO_ANSI_KEYWORDS */
170 #endif /* !__CC_SUPPORTS___INLINE */
171 #endif /* !(__STDC__ || __cplusplus) */
172
173 /*
174 * Compiler-dependent macros to help declare dead (non-returning) and
175 * pure (no side effects) functions, and unused variables. They are
176 * null except for versions of gcc that are known to support the features
177 * properly (old versions of gcc-2 supported the dead and pure features
178 * in a different (wrong) way). If we do not provide an implementation
179 * for a given compiler, let the compile fail if it is told to use
180 * a feature that we cannot live without.
181 */
182 #ifdef lint
183 #define __dead2
184 #define __pure2
185 #define __unused
186 #define __packed
187 #define __aligned(x)
188 #define __section(x)
189 #else
190 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
191 #define __dead2
192 #define __pure2
193 #define __unused
194 #endif
195 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
196 #define __dead2 __attribute__((__noreturn__))
197 #define __pure2 __attribute__((__const__))
198 #define __unused
199 /* XXX Find out what to do for __packed, __aligned and __section */
200 #endif
201 #if __GNUC_PREREQ__(2, 7)
202 #define __dead2 __attribute__((__noreturn__))
203 #define __pure2 __attribute__((__const__))
204 #define __unused __attribute__((__unused__))
205 #define __used __attribute__((__used__))
206 #define __packed __attribute__((__packed__))
207 #define __aligned(x) __attribute__((__aligned__(x)))
208 #define __section(x) __attribute__((__section__(x)))
209 #endif
210 #if defined(__INTEL_COMPILER)
211 #define __dead2 __attribute__((__noreturn__))
212 #define __pure2 __attribute__((__const__))
213 #define __unused __attribute__((__unused__))
214 #define __used __attribute__((__used__))
215 #define __packed __attribute__((__packed__))
216 #define __aligned(x) __attribute__((__aligned__(x)))
217 #define __section(x) __attribute__((__section__(x)))
218 #endif
219 #endif
220
221 #if !__GNUC_PREREQ__(2, 95)
222 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
223 #endif
224
225 /*
226 * Keywords added in C11.
227 */
228 #if defined(__cplusplus) && __cplusplus >= 201103L
229 #define _Alignas(e) alignas(e)
230 #define _Alignof(e) alignof(e)
231 #define _Noreturn [[noreturn]]
232 #define _Static_assert(e, s) static_assert(e, s)
233 /* FIXME: change this to thread_local when clang in base supports it */
234 #define _Thread_local __thread
235 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
236 /* Do nothing. They are language keywords. */
237 #else
238 /* Not supported. Implement them using our versions. */
239 #define _Alignas(x) __aligned(x)
240 #define _Alignof(x) __alignof(x)
241 #define _Noreturn __dead2
242 #define _Thread_local __thread
243 #ifdef __COUNTER__
244 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
245 #define __Static_assert(x, y) ___Static_assert(x, y)
246 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1]
247 #else
248 #define _Static_assert(x, y) struct __hack
249 #endif
250 #endif
251
252 /*
253 * Emulation of C11 _Generic(). Unlike the previously defined C11
254 * keywords, it is not possible to implement this using exactly the same
255 * syntax. Therefore implement something similar under the name
256 * __generic(). Unlike _Generic(), this macro can only distinguish
257 * between a single type, so it requires nested invocations to
258 * distinguish multiple cases.
259 */
260
261 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
262 #define __generic(expr, t, yes, no) \
263 _Generic(expr, t: yes, default: no)
264 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
265 #define __generic(expr, t, yes, no) \
266 __builtin_choose_expr( \
267 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
268 #endif
269
270 #if __GNUC_PREREQ__(2, 96)
271 #define __malloc_like __attribute__((__malloc__))
272 #define __pure __attribute__((__pure__))
273 #else
274 #define __malloc_like
275 #define __pure
276 #endif
277
278 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
279 #define __always_inline __attribute__((__always_inline__))
280 #else
281 #define __always_inline
282 #endif
283
284 #if __GNUC_PREREQ__(3, 1)
285 #define __noinline __attribute__ ((__noinline__))
286 #else
287 #define __noinline
288 #endif
289
290 #if __GNUC_PREREQ__(3, 3)
291 #define __nonnull(x) __attribute__((__nonnull__(x)))
292 #else
293 #define __nonnull(x)
294 #endif
295
296 #if __GNUC_PREREQ__(3, 4)
297 #define __fastcall __attribute__((__fastcall__))
298 #else
299 #define __fastcall
300 #endif
301
302 #if __GNUC_PREREQ__(4, 1)
303 #define __returns_twice __attribute__((__returns_twice__))
304 #else
305 #define __returns_twice
306 #endif
307
308 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
309 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
310 #define __func__ NULL
311 #endif
312
313 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
314 #define __LONG_LONG_SUPPORTED
315 #endif
316
317 /* C++11 exposes a load of C99 stuff */
318 #if defined(__cplusplus) && __cplusplus >= 201103L
319 #define __LONG_LONG_SUPPORTED
320 #ifndef __STDC_LIMIT_MACROS
321 #define __STDC_LIMIT_MACROS
322 #endif
323 #ifndef __STDC_CONSTANT_MACROS
324 #define __STDC_CONSTANT_MACROS
325 #endif
326 #endif
327
328 /*
329 * GCC 2.95 provides `__restrict' as an extension to C90 to support the
330 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as
331 * a way to define the `restrict' type qualifier without disturbing older
332 * software that is unaware of C99 keywords.
333 */
334 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
335 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
336 #define __restrict
337 #else
338 #define __restrict restrict
339 #endif
340 #endif
341
342 /*
343 * GNU C version 2.96 adds explicit branch prediction so that
344 * the CPU back-end can hint the processor and also so that
345 * code blocks can be reordered such that the predicted path
346 * sees a more linear flow, thus improving cache behavior, etc.
347 *
348 * The following two macros provide us with a way to utilize this
349 * compiler feature. Use __predict_true() if you expect the expression
350 * to evaluate to true, and __predict_false() if you expect the
351 * expression to evaluate to false.
352 *
353 * A few notes about usage:
354 *
355 * * Generally, __predict_false() error condition checks (unless
356 * you have some _strong_ reason to do otherwise, in which case
357 * document it), and/or __predict_true() `no-error' condition
358 * checks, assuming you want to optimize for the no-error case.
359 *
360 * * Other than that, if you don't know the likelihood of a test
361 * succeeding from empirical or other `hard' evidence, don't
362 * make predictions.
363 *
364 * * These are meant to be used in places that are run `a lot'.
365 * It is wasteful to make predictions in code that is run
366 * seldomly (e.g. at subsystem initialization time) as the
367 * basic block reordering that this affects can often generate
368 * larger code.
369 */
370 #if __GNUC_PREREQ__(2, 96)
371 #define __predict_true(exp) __builtin_expect((exp), 1)
372 #define __predict_false(exp) __builtin_expect((exp), 0)
373 #else
374 #define __predict_true(exp) (exp)
375 #define __predict_false(exp) (exp)
376 #endif
377
378 #if __GNUC_PREREQ__(4, 2)
379 #define __hidden __attribute__((__visibility__("hidden")))
380 #define __exported __attribute__((__visibility__("default")))
381 #else
382 #define __hidden
383 #define __exported
384 #endif
385
386 /*
387 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
388 * require it.
389 */
390 #if __GNUC_PREREQ__(4, 1)
391 #define __offsetof(type, field) __builtin_offsetof(type, field)
392 #else
393 #ifndef __cplusplus
394 #define __offsetof(type, field) \
395 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
396 #else
397 #define __offsetof(type, field) \
398 (__offsetof__ (reinterpret_cast <__size_t> \
399 (&reinterpret_cast <const volatile char &> \
400 (static_cast<type *> (0)->field))))
401 #endif
402 #endif
403 #define __rangeof(type, start, end) \
404 (__offsetof(type, end) - __offsetof(type, start))
405
406 /*
407 * Compiler-dependent macros to declare that functions take printf-like
408 * or scanf-like arguments. They are null except for versions of gcc
409 * that are known to support the features properly (old versions of gcc-2
410 * didn't permit keeping the keywords out of the application namespace).
411 */
412 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
413 #define __printflike(fmtarg, firstvararg)
414 #define __scanflike(fmtarg, firstvararg)
415 #define __format_arg(fmtarg)
416 #define __strfmonlike(fmtarg, firstvararg)
417 #define __strftimelike(fmtarg, firstvararg)
418 #else
419 #define __printflike(fmtarg, firstvararg) \
420 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
421 #define __scanflike(fmtarg, firstvararg) \
422 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
423 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
424 #define __strfmonlike(fmtarg, firstvararg) \
425 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
426 #define __strftimelike(fmtarg, firstvararg) \
427 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
428 #endif
429
430 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
431 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
432 #define __printf0like(fmtarg, firstvararg) \
433 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
434 #else
435 #define __printf0like(fmtarg, firstvararg)
436 #endif
437
438 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
439 #ifndef __INTEL_COMPILER
440 #define __strong_reference(sym,aliassym) \
441 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
442 #endif
443 #ifdef __STDC__
444 #define __weak_reference(sym,alias) \
445 __asm__(".weak " #alias); \
446 __asm__(".equ " #alias ", " #sym)
447 #define __warn_references(sym,msg) \
448 __asm__(".section .gnu.warning." #sym); \
449 __asm__(".asciz \"" msg "\""); \
450 __asm__(".previous")
451 #define __sym_compat(sym,impl,verid) \
452 __asm__(".symver " #impl ", " #sym "@" #verid)
453 #define __sym_default(sym,impl,verid) \
454 __asm__(".symver " #impl ", " #sym "@@" #verid)
455 #else
456 #define __weak_reference(sym,alias) \
457 __asm__(".weak alias"); \
458 __asm__(".equ alias, sym")
459 #define __warn_references(sym,msg) \
460 __asm__(".section .gnu.warning.sym"); \
461 __asm__(".asciz \"msg\""); \
462 __asm__(".previous")
463 #define __sym_compat(sym,impl,verid) \
464 __asm__(".symver impl, sym@verid")
465 #define __sym_default(impl,sym,verid) \
466 __asm__(".symver impl, sym@@verid")
467 #endif /* __STDC__ */
468 #endif /* __GNUC__ || __INTEL_COMPILER */
469
470 #define __GLOBL1(sym) __asm__(".globl " #sym)
471 #define __GLOBL(sym) __GLOBL1(sym)
472
473 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
474 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
475 #else
476 /*
477 * The following definition might not work well if used in header files,
478 * but it should be better than nothing. If you want a "do nothing"
479 * version, then it should generate some harmless declaration, such as:
480 * #define __IDSTRING(name,string) struct __hack
481 */
482 #define __IDSTRING(name,string) static const char name[] __unused = string
483 #endif
484
485 /*
486 * Embed the rcs id of a source file in the resulting library. Note that in
487 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
488 * Usage:
489 * __FBSDID("$FreeBSD: releng/9.1/sys/sys/cdefs.h 237665 2012-06-27 21:18:47Z jkim $");
490 */
491 #ifndef __FBSDID
492 #if !defined(lint) && !defined(STRIP_FBSDID)
493 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
494 #else
495 #define __FBSDID(s) struct __hack
496 #endif
497 #endif
498
499 #ifndef __RCSID
500 #ifndef NO__RCSID
501 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
502 #else
503 #define __RCSID(s) struct __hack
504 #endif
505 #endif
506
507 #ifndef __RCSID_SOURCE
508 #ifndef NO__RCSID_SOURCE
509 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
510 #else
511 #define __RCSID_SOURCE(s) struct __hack
512 #endif
513 #endif
514
515 #ifndef __SCCSID
516 #ifndef NO__SCCSID
517 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
518 #else
519 #define __SCCSID(s) struct __hack
520 #endif
521 #endif
522
523 #ifndef __COPYRIGHT
524 #ifndef NO__COPYRIGHT
525 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
526 #else
527 #define __COPYRIGHT(s) struct __hack
528 #endif
529 #endif
530
531 #ifndef __DECONST
532 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
533 #endif
534
535 #ifndef __DEVOLATILE
536 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
537 #endif
538
539 #ifndef __DEQUALIFY
540 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
541 #endif
542
543 /*-
544 * The following definitions are an extension of the behavior originally
545 * implemented in <sys/_posix.h>, but with a different level of granularity.
546 * POSIX.1 requires that the macros we test be defined before any standard
547 * header file is included.
548 *
549 * Here's a quick run-down of the versions:
550 * defined(_POSIX_SOURCE) 1003.1-1988
551 * _POSIX_C_SOURCE == 1 1003.1-1990
552 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
553 * _POSIX_C_SOURCE == 199309 1003.1b-1993
554 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
555 * and the omnibus ISO/IEC 9945-1: 1996
556 * _POSIX_C_SOURCE == 200112 1003.1-2001
557 * _POSIX_C_SOURCE == 200809 1003.1-2008
558 *
559 * In addition, the X/Open Portability Guide, which is now the Single UNIX
560 * Specification, defines a feature-test macro which indicates the version of
561 * that specification, and which subsumes _POSIX_C_SOURCE.
562 *
563 * Our macros begin with two underscores to avoid namespace screwage.
564 */
565
566 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
567 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
568 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
569 #define _POSIX_C_SOURCE 199009
570 #endif
571
572 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
573 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
574 #undef _POSIX_C_SOURCE
575 #define _POSIX_C_SOURCE 199209
576 #endif
577
578 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
579 #ifdef _XOPEN_SOURCE
580 #if _XOPEN_SOURCE - 0 >= 700
581 #define __XSI_VISIBLE 700
582 #undef _POSIX_C_SOURCE
583 #define _POSIX_C_SOURCE 200809
584 #elif _XOPEN_SOURCE - 0 >= 600
585 #define __XSI_VISIBLE 600
586 #undef _POSIX_C_SOURCE
587 #define _POSIX_C_SOURCE 200112
588 #elif _XOPEN_SOURCE - 0 >= 500
589 #define __XSI_VISIBLE 500
590 #undef _POSIX_C_SOURCE
591 #define _POSIX_C_SOURCE 199506
592 #endif
593 #endif
594
595 /*
596 * Deal with all versions of POSIX. The ordering relative to the tests above is
597 * important.
598 */
599 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
600 #define _POSIX_C_SOURCE 198808
601 #endif
602 #ifdef _POSIX_C_SOURCE
603 #if _POSIX_C_SOURCE >= 200809
604 #define __POSIX_VISIBLE 200809
605 #define __ISO_C_VISIBLE 1999
606 #elif _POSIX_C_SOURCE >= 200112
607 #define __POSIX_VISIBLE 200112
608 #define __ISO_C_VISIBLE 1999
609 #elif _POSIX_C_SOURCE >= 199506
610 #define __POSIX_VISIBLE 199506
611 #define __ISO_C_VISIBLE 1990
612 #elif _POSIX_C_SOURCE >= 199309
613 #define __POSIX_VISIBLE 199309
614 #define __ISO_C_VISIBLE 1990
615 #elif _POSIX_C_SOURCE >= 199209
616 #define __POSIX_VISIBLE 199209
617 #define __ISO_C_VISIBLE 1990
618 #elif _POSIX_C_SOURCE >= 199009
619 #define __POSIX_VISIBLE 199009
620 #define __ISO_C_VISIBLE 1990
621 #else
622 #define __POSIX_VISIBLE 198808
623 #define __ISO_C_VISIBLE 0
624 #endif /* _POSIX_C_SOURCE */
625 #else
626 /*-
627 * Deal with _ANSI_SOURCE:
628 * If it is defined, and no other compilation environment is explicitly
629 * requested, then define our internal feature-test macros to zero. This
630 * makes no difference to the preprocessor (undefined symbols in preprocessing
631 * expressions are defined to have value zero), but makes it more convenient for
632 * a test program to print out the values.
633 *
634 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
635 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
636 * environment (and in fact we will never get here).
637 */
638 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
639 #define __POSIX_VISIBLE 0
640 #define __XSI_VISIBLE 0
641 #define __BSD_VISIBLE 0
642 #define __ISO_C_VISIBLE 1990
643 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
644 #define __POSIX_VISIBLE 0
645 #define __XSI_VISIBLE 0
646 #define __BSD_VISIBLE 0
647 #define __ISO_C_VISIBLE 1999
648 #else /* Default environment: show everything. */
649 #define __POSIX_VISIBLE 200809
650 #define __XSI_VISIBLE 700
651 #define __BSD_VISIBLE 1
652 #define __ISO_C_VISIBLE 1999
653 #endif
654 #endif
655
656 #ifndef __has_feature
657 #define __has_feature(x) 0
658 #endif
659 #ifndef __has_include
660 #define __has_include(x) 0
661 #endif
662 #ifndef __has_builtin
663 #define __has_builtin(x) 0
664 #endif
665
666 #if defined(__mips) || defined(__powerpc64__) || defined(__arm__)
667 #define __NO_TLS 1
668 #endif
669
670 #endif /* !_SYS_CDEFS_H_ */
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