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/10.4/sys/sys/cdefs.h 314494 2017-03-01 13:47:36Z avg $
34 */
35
36 #ifndef _SYS_CDEFS_H_
37 #define _SYS_CDEFS_H_
38
39 /*
40 * Testing against Clang-specific extensions.
41 */
42
43 #ifndef __has_attribute
44 #define __has_attribute(x) 0
45 #endif
46 #ifndef __has_extension
47 #define __has_extension __has_feature
48 #endif
49 #ifndef __has_feature
50 #define __has_feature(x) 0
51 #endif
52 #ifndef __has_include
53 #define __has_include(x) 0
54 #endif
55 #ifndef __has_builtin
56 #define __has_builtin(x) 0
57 #endif
58
59 #if defined(__cplusplus)
60 #define __BEGIN_DECLS extern "C" {
61 #define __END_DECLS }
62 #else
63 #define __BEGIN_DECLS
64 #define __END_DECLS
65 #endif
66
67 /*
68 * This code has been put in place to help reduce the addition of
69 * compiler specific defines in FreeBSD code. It helps to aid in
70 * having a compiler-agnostic source tree.
71 */
72
73 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
74
75 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
76 #define __GNUCLIKE_ASM 3
77 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
78 #else
79 #define __GNUCLIKE_ASM 2
80 #endif
81 #define __GNUCLIKE___TYPEOF 1
82 #define __GNUCLIKE___OFFSETOF 1
83 #define __GNUCLIKE___SECTION 1
84
85 #ifndef __INTEL_COMPILER
86 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
87 #endif
88
89 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
90 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
91 && __INTEL_COMPILER < 800
92 # undef __GNUCLIKE_BUILTIN_CONSTANT_P
93 # endif
94
95 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3)
96 # define __GNUCLIKE_BUILTIN_VARARGS 1
97 # define __GNUCLIKE_BUILTIN_STDARG 1
98 # define __GNUCLIKE_BUILTIN_VAALIST 1
99 #endif
100
101 #if defined(__GNUC__)
102 # define __GNUC_VA_LIST_COMPATIBILITY 1
103 #endif
104
105 /*
106 * Compiler memory barriers, specific to gcc and clang.
107 */
108 #if defined(__GNUC__)
109 #define __compiler_membar() __asm __volatile(" " : : : "memory")
110 #endif
111
112 #ifndef __INTEL_COMPILER
113 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
114 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
115 #endif
116
117 #define __GNUCLIKE_BUILTIN_MEMCPY 1
118
119 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
120 #define __CC_SUPPORTS_INLINE 1
121 #define __CC_SUPPORTS___INLINE 1
122 #define __CC_SUPPORTS___INLINE__ 1
123
124 #define __CC_SUPPORTS___FUNC__ 1
125 #define __CC_SUPPORTS_WARNING 1
126
127 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
128
129 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
130
131 #endif /* __GNUC__ || __INTEL_COMPILER */
132
133 /*
134 * Macro to test if we're using a specific version of gcc or later.
135 */
136 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
137 #define __GNUC_PREREQ__(ma, mi) \
138 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
139 #else
140 #define __GNUC_PREREQ__(ma, mi) 0
141 #endif
142
143 /*
144 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
145 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
146 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
147 * mode -- there must be no spaces between its arguments, and for nested
148 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
149 * concatenate double-quoted strings produced by the __STRING macro, but
150 * this only works with ANSI C.
151 *
152 * __XSTRING is like __STRING, but it expands any macros in its argument
153 * first. It is only available with ANSI C.
154 */
155 #if defined(__STDC__) || defined(__cplusplus)
156 #define __P(protos) protos /* full-blown ANSI C */
157 #define __CONCAT1(x,y) x ## y
158 #define __CONCAT(x,y) __CONCAT1(x,y)
159 #define __STRING(x) #x /* stringify without expanding x */
160 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
161
162 #define __const const /* define reserved names to standard */
163 #define __signed signed
164 #define __volatile volatile
165 #if defined(__cplusplus)
166 #define __inline inline /* convert to C++ keyword */
167 #else
168 #if !(defined(__CC_SUPPORTS___INLINE))
169 #define __inline /* delete GCC keyword */
170 #endif /* ! __CC_SUPPORTS___INLINE */
171 #endif /* !__cplusplus */
172
173 #else /* !(__STDC__ || __cplusplus) */
174 #define __P(protos) () /* traditional C preprocessor */
175 #define __CONCAT(x,y) x/**/y
176 #define __STRING(x) "x"
177
178 #if !defined(__CC_SUPPORTS___INLINE)
179 #define __const /* delete pseudo-ANSI C keywords */
180 #define __inline
181 #define __signed
182 #define __volatile
183 /*
184 * In non-ANSI C environments, new programs will want ANSI-only C keywords
185 * deleted from the program and old programs will want them left alone.
186 * When using a compiler other than gcc, programs using the ANSI C keywords
187 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
188 * When using "gcc -traditional", we assume that this is the intent; if
189 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
190 */
191 #ifndef NO_ANSI_KEYWORDS
192 #define const /* delete ANSI C keywords */
193 #define inline
194 #define signed
195 #define volatile
196 #endif /* !NO_ANSI_KEYWORDS */
197 #endif /* !__CC_SUPPORTS___INLINE */
198 #endif /* !(__STDC__ || __cplusplus) */
199
200 /*
201 * Compiler-dependent macros to help declare dead (non-returning) and
202 * pure (no side effects) functions, and unused variables. They are
203 * null except for versions of gcc that are known to support the features
204 * properly (old versions of gcc-2 supported the dead and pure features
205 * in a different (wrong) way). If we do not provide an implementation
206 * for a given compiler, let the compile fail if it is told to use
207 * a feature that we cannot live without.
208 */
209 #ifdef lint
210 #define __dead2
211 #define __pure2
212 #define __unused
213 #define __packed
214 #define __aligned(x)
215 #define __section(x)
216 #define __weak_symbol
217 #else
218 #define __weak_symbol __attribute__((__weak__))
219 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
220 #define __dead2
221 #define __pure2
222 #define __unused
223 #endif
224 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
225 #define __dead2 __attribute__((__noreturn__))
226 #define __pure2 __attribute__((__const__))
227 #define __unused
228 /* XXX Find out what to do for __packed, __aligned and __section */
229 #endif
230 #if __GNUC_PREREQ__(2, 7)
231 #define __dead2 __attribute__((__noreturn__))
232 #define __pure2 __attribute__((__const__))
233 #define __unused __attribute__((__unused__))
234 #define __used __attribute__((__used__))
235 #define __packed __attribute__((__packed__))
236 #define __aligned(x) __attribute__((__aligned__(x)))
237 #define __section(x) __attribute__((__section__(x)))
238 #endif
239 #if defined(__INTEL_COMPILER)
240 #define __dead2 __attribute__((__noreturn__))
241 #define __pure2 __attribute__((__const__))
242 #define __unused __attribute__((__unused__))
243 #define __used __attribute__((__used__))
244 #define __packed __attribute__((__packed__))
245 #define __aligned(x) __attribute__((__aligned__(x)))
246 #define __section(x) __attribute__((__section__(x)))
247 #endif
248 #endif /* lint */
249
250 #if !__GNUC_PREREQ__(2, 95)
251 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
252 #endif
253
254 /*
255 * Keywords added in C11.
256 */
257
258 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L || defined(lint)
259
260 #if !__has_extension(c_alignas)
261 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
262 __has_extension(cxx_alignas)
263 #define _Alignas(x) alignas(x)
264 #else
265 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
266 #define _Alignas(x) __aligned(x)
267 #endif
268 #endif
269
270 #if defined(__cplusplus) && __cplusplus >= 201103L
271 #define _Alignof(x) alignof(x)
272 #else
273 #define _Alignof(x) __alignof(x)
274 #endif
275
276 #if !defined(__cplusplus) && !__has_extension(c_atomic) && \
277 !__has_extension(cxx_atomic)
278 /*
279 * No native support for _Atomic(). Place object in structure to prevent
280 * most forms of direct non-atomic access.
281 */
282 #define _Atomic(T) struct { T volatile __val; }
283 #endif
284
285 #if defined(__cplusplus) && __cplusplus >= 201103L
286 #define _Noreturn [[noreturn]]
287 #else
288 #define _Noreturn __dead2
289 #endif
290
291 #if !__has_extension(c_static_assert)
292 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
293 __has_extension(cxx_static_assert)
294 #define _Static_assert(x, y) static_assert(x, y)
295 #elif defined(__COUNTER__)
296 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
297 #define __Static_assert(x, y) ___Static_assert(x, y)
298 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1] \
299 __unused
300 #else
301 #define _Static_assert(x, y) struct __hack
302 #endif
303 #endif
304
305 #if !__has_extension(c_thread_local)
306 /* XXX: Change this to test against C++11 when clang in base supports it. */
307 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
308 __has_extension(cxx_thread_local)
309 #define _Thread_local thread_local
310 #else
311 #define _Thread_local __thread
312 #endif
313 #endif
314
315 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
316
317 /*
318 * Emulation of C11 _Generic(). Unlike the previously defined C11
319 * keywords, it is not possible to implement this using exactly the same
320 * syntax. Therefore implement something similar under the name
321 * __generic(). Unlike _Generic(), this macro can only distinguish
322 * between a single type, so it requires nested invocations to
323 * distinguish multiple cases.
324 */
325
326 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
327 #define __generic(expr, t, yes, no) \
328 _Generic(expr, t: yes, default: no)
329 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
330 #define __generic(expr, t, yes, no) \
331 __builtin_choose_expr( \
332 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
333 #endif
334
335 /*
336 * C99 Static array indices in function parameter declarations. Syntax such as:
337 * void bar(int myArray[static 10]);
338 * is allowed in C99 but not in C++. Define __min_size appropriately so
339 * headers using it can be compiled in either language. Use like this:
340 * void bar(int myArray[__min_size(10)]);
341 */
342 #if !defined(__cplusplus) && \
343 (defined(__clang__) || __GNUC_PREREQ__(4, 6)) && \
344 (!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901))
345 #define __min_size(x) static (x)
346 #else
347 #define __min_size(x) (x)
348 #endif
349
350 #if __GNUC_PREREQ__(2, 96)
351 #define __malloc_like __attribute__((__malloc__))
352 #define __pure __attribute__((__pure__))
353 #else
354 #define __malloc_like
355 #define __pure
356 #endif
357
358 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
359 #define __always_inline __attribute__((__always_inline__))
360 #else
361 #define __always_inline
362 #endif
363
364 #if __GNUC_PREREQ__(3, 1)
365 #define __noinline __attribute__ ((__noinline__))
366 #else
367 #define __noinline
368 #endif
369
370 #if __GNUC_PREREQ__(3, 3)
371 #define __nonnull(x) __attribute__((__nonnull__(x)))
372 #else
373 #define __nonnull(x)
374 #endif
375
376 #if __GNUC_PREREQ__(3, 4)
377 #define __fastcall __attribute__((__fastcall__))
378 #define __result_use_check __attribute__((__warn_unused_result__))
379 #else
380 #define __fastcall
381 #define __result_use_check
382 #endif
383
384 #if __GNUC_PREREQ__(4, 1)
385 #define __returns_twice __attribute__((__returns_twice__))
386 #else
387 #define __returns_twice
388 #endif
389
390 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
391 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
392 #define __func__ NULL
393 #endif
394
395 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
396 #define __LONG_LONG_SUPPORTED
397 #endif
398
399 /* C++11 exposes a load of C99 stuff */
400 #if defined(__cplusplus) && __cplusplus >= 201103L
401 #define __LONG_LONG_SUPPORTED
402 #ifndef __STDC_LIMIT_MACROS
403 #define __STDC_LIMIT_MACROS
404 #endif
405 #ifndef __STDC_CONSTANT_MACROS
406 #define __STDC_CONSTANT_MACROS
407 #endif
408 #endif
409
410 /*
411 * GCC 2.95 provides `__restrict' as an extension to C90 to support the
412 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as
413 * a way to define the `restrict' type qualifier without disturbing older
414 * software that is unaware of C99 keywords.
415 */
416 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
417 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
418 #define __restrict
419 #else
420 #define __restrict restrict
421 #endif
422 #endif
423
424 /*
425 * GNU C version 2.96 adds explicit branch prediction so that
426 * the CPU back-end can hint the processor and also so that
427 * code blocks can be reordered such that the predicted path
428 * sees a more linear flow, thus improving cache behavior, etc.
429 *
430 * The following two macros provide us with a way to utilize this
431 * compiler feature. Use __predict_true() if you expect the expression
432 * to evaluate to true, and __predict_false() if you expect the
433 * expression to evaluate to false.
434 *
435 * A few notes about usage:
436 *
437 * * Generally, __predict_false() error condition checks (unless
438 * you have some _strong_ reason to do otherwise, in which case
439 * document it), and/or __predict_true() `no-error' condition
440 * checks, assuming you want to optimize for the no-error case.
441 *
442 * * Other than that, if you don't know the likelihood of a test
443 * succeeding from empirical or other `hard' evidence, don't
444 * make predictions.
445 *
446 * * These are meant to be used in places that are run `a lot'.
447 * It is wasteful to make predictions in code that is run
448 * seldomly (e.g. at subsystem initialization time) as the
449 * basic block reordering that this affects can often generate
450 * larger code.
451 */
452 #if __GNUC_PREREQ__(2, 96)
453 #define __predict_true(exp) __builtin_expect((exp), 1)
454 #define __predict_false(exp) __builtin_expect((exp), 0)
455 #else
456 #define __predict_true(exp) (exp)
457 #define __predict_false(exp) (exp)
458 #endif
459
460 #if __GNUC_PREREQ__(4, 0)
461 #define __hidden __attribute__((__visibility__("hidden")))
462 #define __exported __attribute__((__visibility__("default")))
463 #else
464 #define __hidden
465 #define __exported
466 #endif
467
468 /*
469 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
470 * require it.
471 */
472 #if __GNUC_PREREQ__(4, 1)
473 #define __offsetof(type, field) __builtin_offsetof(type, field)
474 #else
475 #ifndef __cplusplus
476 #define __offsetof(type, field) \
477 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
478 #else
479 #define __offsetof(type, field) \
480 (__offsetof__ (reinterpret_cast <__size_t> \
481 (&reinterpret_cast <const volatile char &> \
482 (static_cast<type *> (0)->field))))
483 #endif
484 #endif
485 #define __rangeof(type, start, end) \
486 (__offsetof(type, end) - __offsetof(type, start))
487
488 /*
489 * Given the pointer x to the member m of the struct s, return
490 * a pointer to the containing structure. When using GCC, we first
491 * assign pointer x to a local variable, to check that its type is
492 * compatible with member m.
493 */
494 #if __GNUC_PREREQ__(3, 1)
495 #define __containerof(x, s, m) ({ \
496 const volatile __typeof(((s *)0)->m) *__x = (x); \
497 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
498 })
499 #else
500 #define __containerof(x, s, m) \
501 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
502 #endif
503
504 /*
505 * Compiler-dependent macros to declare that functions take printf-like
506 * or scanf-like arguments. They are null except for versions of gcc
507 * that are known to support the features properly (old versions of gcc-2
508 * didn't permit keeping the keywords out of the application namespace).
509 */
510 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
511 #define __printflike(fmtarg, firstvararg)
512 #define __scanflike(fmtarg, firstvararg)
513 #define __format_arg(fmtarg)
514 #define __strfmonlike(fmtarg, firstvararg)
515 #define __strftimelike(fmtarg, firstvararg)
516 #else
517 #define __printflike(fmtarg, firstvararg) \
518 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
519 #define __scanflike(fmtarg, firstvararg) \
520 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
521 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
522 #define __strfmonlike(fmtarg, firstvararg) \
523 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
524 #define __strftimelike(fmtarg, firstvararg) \
525 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
526 #endif
527
528 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
529 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
530 defined(__GNUC__) && !defined(__INTEL_COMPILER)
531 #define __printf0like(fmtarg, firstvararg) \
532 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
533 #else
534 #define __printf0like(fmtarg, firstvararg)
535 #endif
536
537 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
538 #ifndef __INTEL_COMPILER
539 #define __strong_reference(sym,aliassym) \
540 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
541 #endif
542 #ifdef __STDC__
543 #define __weak_reference(sym,alias) \
544 __asm__(".weak " #alias); \
545 __asm__(".equ " #alias ", " #sym)
546 #define __warn_references(sym,msg) \
547 __asm__(".section .gnu.warning." #sym); \
548 __asm__(".asciz \"" msg "\""); \
549 __asm__(".previous")
550 #define __sym_compat(sym,impl,verid) \
551 __asm__(".symver " #impl ", " #sym "@" #verid)
552 #define __sym_default(sym,impl,verid) \
553 __asm__(".symver " #impl ", " #sym "@@" #verid)
554 #else
555 #define __weak_reference(sym,alias) \
556 __asm__(".weak alias"); \
557 __asm__(".equ alias, sym")
558 #define __warn_references(sym,msg) \
559 __asm__(".section .gnu.warning.sym"); \
560 __asm__(".asciz \"msg\""); \
561 __asm__(".previous")
562 #define __sym_compat(sym,impl,verid) \
563 __asm__(".symver impl, sym@verid")
564 #define __sym_default(impl,sym,verid) \
565 __asm__(".symver impl, sym@@verid")
566 #endif /* __STDC__ */
567 #endif /* __GNUC__ || __INTEL_COMPILER */
568
569 #define __GLOBL1(sym) __asm__(".globl " #sym)
570 #define __GLOBL(sym) __GLOBL1(sym)
571
572 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
573 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
574 #else
575 /*
576 * The following definition might not work well if used in header files,
577 * but it should be better than nothing. If you want a "do nothing"
578 * version, then it should generate some harmless declaration, such as:
579 * #define __IDSTRING(name,string) struct __hack
580 */
581 #define __IDSTRING(name,string) static const char name[] __unused = string
582 #endif
583
584 /*
585 * Embed the rcs id of a source file in the resulting library. Note that in
586 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
587 * Usage:
588 * __FBSDID("$FreeBSD: releng/10.4/sys/sys/cdefs.h 314494 2017-03-01 13:47:36Z avg $");
589 */
590 #ifndef __FBSDID
591 #if !defined(lint) && !defined(STRIP_FBSDID)
592 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
593 #else
594 #define __FBSDID(s) struct __hack
595 #endif
596 #endif
597
598 #ifndef __RCSID
599 #ifndef NO__RCSID
600 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
601 #else
602 #define __RCSID(s) struct __hack
603 #endif
604 #endif
605
606 #ifndef __RCSID_SOURCE
607 #ifndef NO__RCSID_SOURCE
608 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
609 #else
610 #define __RCSID_SOURCE(s) struct __hack
611 #endif
612 #endif
613
614 #ifndef __SCCSID
615 #ifndef NO__SCCSID
616 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
617 #else
618 #define __SCCSID(s) struct __hack
619 #endif
620 #endif
621
622 #ifndef __COPYRIGHT
623 #ifndef NO__COPYRIGHT
624 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
625 #else
626 #define __COPYRIGHT(s) struct __hack
627 #endif
628 #endif
629
630 #ifndef __DECONST
631 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
632 #endif
633
634 #ifndef __DEVOLATILE
635 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
636 #endif
637
638 #ifndef __DEQUALIFY
639 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
640 #endif
641
642 /*-
643 * The following definitions are an extension of the behavior originally
644 * implemented in <sys/_posix.h>, but with a different level of granularity.
645 * POSIX.1 requires that the macros we test be defined before any standard
646 * header file is included.
647 *
648 * Here's a quick run-down of the versions:
649 * defined(_POSIX_SOURCE) 1003.1-1988
650 * _POSIX_C_SOURCE == 1 1003.1-1990
651 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
652 * _POSIX_C_SOURCE == 199309 1003.1b-1993
653 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
654 * and the omnibus ISO/IEC 9945-1: 1996
655 * _POSIX_C_SOURCE == 200112 1003.1-2001
656 * _POSIX_C_SOURCE == 200809 1003.1-2008
657 *
658 * In addition, the X/Open Portability Guide, which is now the Single UNIX
659 * Specification, defines a feature-test macro which indicates the version of
660 * that specification, and which subsumes _POSIX_C_SOURCE.
661 *
662 * Our macros begin with two underscores to avoid namespace screwage.
663 */
664
665 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
666 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
667 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
668 #define _POSIX_C_SOURCE 199009
669 #endif
670
671 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
672 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
673 #undef _POSIX_C_SOURCE
674 #define _POSIX_C_SOURCE 199209
675 #endif
676
677 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
678 #ifdef _XOPEN_SOURCE
679 #if _XOPEN_SOURCE - 0 >= 700
680 #define __XSI_VISIBLE 700
681 #undef _POSIX_C_SOURCE
682 #define _POSIX_C_SOURCE 200809
683 #elif _XOPEN_SOURCE - 0 >= 600
684 #define __XSI_VISIBLE 600
685 #undef _POSIX_C_SOURCE
686 #define _POSIX_C_SOURCE 200112
687 #elif _XOPEN_SOURCE - 0 >= 500
688 #define __XSI_VISIBLE 500
689 #undef _POSIX_C_SOURCE
690 #define _POSIX_C_SOURCE 199506
691 #endif
692 #endif
693
694 /*
695 * Deal with all versions of POSIX. The ordering relative to the tests above is
696 * important.
697 */
698 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
699 #define _POSIX_C_SOURCE 198808
700 #endif
701 #ifdef _POSIX_C_SOURCE
702 #if _POSIX_C_SOURCE >= 200809
703 #define __POSIX_VISIBLE 200809
704 #define __ISO_C_VISIBLE 1999
705 #elif _POSIX_C_SOURCE >= 200112
706 #define __POSIX_VISIBLE 200112
707 #define __ISO_C_VISIBLE 1999
708 #elif _POSIX_C_SOURCE >= 199506
709 #define __POSIX_VISIBLE 199506
710 #define __ISO_C_VISIBLE 1990
711 #elif _POSIX_C_SOURCE >= 199309
712 #define __POSIX_VISIBLE 199309
713 #define __ISO_C_VISIBLE 1990
714 #elif _POSIX_C_SOURCE >= 199209
715 #define __POSIX_VISIBLE 199209
716 #define __ISO_C_VISIBLE 1990
717 #elif _POSIX_C_SOURCE >= 199009
718 #define __POSIX_VISIBLE 199009
719 #define __ISO_C_VISIBLE 1990
720 #else
721 #define __POSIX_VISIBLE 198808
722 #define __ISO_C_VISIBLE 0
723 #endif /* _POSIX_C_SOURCE */
724 #else
725 /*-
726 * Deal with _ANSI_SOURCE:
727 * If it is defined, and no other compilation environment is explicitly
728 * requested, then define our internal feature-test macros to zero. This
729 * makes no difference to the preprocessor (undefined symbols in preprocessing
730 * expressions are defined to have value zero), but makes it more convenient for
731 * a test program to print out the values.
732 *
733 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
734 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
735 * environment (and in fact we will never get here).
736 */
737 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
738 #define __POSIX_VISIBLE 0
739 #define __XSI_VISIBLE 0
740 #define __BSD_VISIBLE 0
741 #define __ISO_C_VISIBLE 1990
742 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
743 #define __POSIX_VISIBLE 0
744 #define __XSI_VISIBLE 0
745 #define __BSD_VISIBLE 0
746 #define __ISO_C_VISIBLE 1999
747 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
748 #define __POSIX_VISIBLE 0
749 #define __XSI_VISIBLE 0
750 #define __BSD_VISIBLE 0
751 #define __ISO_C_VISIBLE 2011
752 #else /* Default environment: show everything. */
753 #define __POSIX_VISIBLE 200809
754 #define __XSI_VISIBLE 700
755 #define __BSD_VISIBLE 1
756 #define __ISO_C_VISIBLE 2011
757 #endif
758 #endif
759
760 #if defined(__mips) || defined(__powerpc64__)
761 #define __NO_TLS 1
762 #endif
763
764 #endif /* !_SYS_CDEFS_H_ */
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