2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Berkeley Software Design, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
32 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95
39 #if defined(__cplusplus)
40 #define __BEGIN_DECLS extern "C" {
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.
53 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
55 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
56 #define __GNUCLIKE_ASM 3
57 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
59 #define __GNUCLIKE_ASM 2
61 #define __GNUCLIKE___TYPEOF 1
62 #define __GNUCLIKE___OFFSETOF 1
63 #define __GNUCLIKE___SECTION 1
65 #ifndef __INTEL_COMPILER
66 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
69 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
70 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
71 && __INTEL_COMPILER < 800
72 # undef __GNUCLIKE_BUILTIN_CONSTANT_P
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
82 # define __GNUC_VA_LIST_COMPATIBILITY 1
86 * Compiler memory barriers, specific to gcc and clang.
89 #define __compiler_membar() __asm __volatile(" " : : : "memory")
92 #ifndef __INTEL_COMPILER
93 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
94 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
97 #define __GNUCLIKE_BUILTIN_MEMCPY 1
99 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
100 #define __CC_SUPPORTS_INLINE 1
101 #define __CC_SUPPORTS___INLINE 1
102 #define __CC_SUPPORTS___INLINE__ 1
104 #define __CC_SUPPORTS___FUNC__ 1
105 #define __CC_SUPPORTS_WARNING 1
107 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
109 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
111 #endif /* __GNUC__ || __INTEL_COMPILER */
114 * Macro to test if we're using a specific version of gcc or later.
116 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
117 #define __GNUC_PREREQ__(ma, mi) \
118 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
120 #define __GNUC_PREREQ__(ma, mi) 0
124 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
125 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
126 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
127 * mode -- there must be no spaces between its arguments, and for nested
128 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
129 * concatenate double-quoted strings produced by the __STRING macro, but
130 * this only works with ANSI C.
132 * __XSTRING is like __STRING, but it expands any macros in its argument
133 * first. It is only available with ANSI C.
135 #if defined(__STDC__) || defined(__cplusplus)
136 #define __P(protos) protos /* full-blown ANSI C */
137 #define __CONCAT1(x,y) x ## y
138 #define __CONCAT(x,y) __CONCAT1(x,y)
139 #define __STRING(x) #x /* stringify without expanding x */
140 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
142 #define __const const /* define reserved names to standard */
143 #define __signed signed
144 #define __volatile volatile
145 #if defined(__cplusplus)
146 #define __inline inline /* convert to C++ keyword */
148 #if !(defined(__CC_SUPPORTS___INLINE))
149 #define __inline /* delete GCC keyword */
150 #endif /* ! __CC_SUPPORTS___INLINE */
151 #endif /* !__cplusplus */
153 #else /* !(__STDC__ || __cplusplus) */
154 #define __P(protos) () /* traditional C preprocessor */
155 #define __CONCAT(x,y) x/**/y
156 #define __STRING(x) "x"
158 #if !defined(__CC_SUPPORTS___INLINE)
159 #define __const /* delete pseudo-ANSI C keywords */
164 * In non-ANSI C environments, new programs will want ANSI-only C keywords
165 * deleted from the program and old programs will want them left alone.
166 * When using a compiler other than gcc, programs using the ANSI C keywords
167 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
168 * When using "gcc -traditional", we assume that this is the intent; if
169 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
171 #ifndef NO_ANSI_KEYWORDS
172 #define const /* delete ANSI C keywords */
176 #endif /* !NO_ANSI_KEYWORDS */
177 #endif /* !__CC_SUPPORTS___INLINE */
178 #endif /* !(__STDC__ || __cplusplus) */
181 * Compiler-dependent macros to help declare dead (non-returning) and
182 * pure (no side effects) functions, and unused variables. They are
183 * null except for versions of gcc that are known to support the features
184 * properly (old versions of gcc-2 supported the dead and pure features
185 * in a different (wrong) way). If we do not provide an implementation
186 * for a given compiler, let the compile fail if it is told to use
187 * a feature that we cannot live without.
197 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
202 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
203 #define __dead2 __attribute__((__noreturn__))
204 #define __pure2 __attribute__((__const__))
206 /* XXX Find out what to do for __packed, __aligned and __section */
208 #if __GNUC_PREREQ__(2, 7)
209 #define __dead2 __attribute__((__noreturn__))
210 #define __pure2 __attribute__((__const__))
211 #define __unused __attribute__((__unused__))
212 #define __used __attribute__((__used__))
213 #define __packed __attribute__((__packed__))
214 #define __aligned(x) __attribute__((__aligned__(x)))
215 #define __section(x) __attribute__((__section__(x)))
217 #if defined(__INTEL_COMPILER)
218 #define __dead2 __attribute__((__noreturn__))
219 #define __pure2 __attribute__((__const__))
220 #define __unused __attribute__((__unused__))
221 #define __used __attribute__((__used__))
222 #define __packed __attribute__((__packed__))
223 #define __aligned(x) __attribute__((__aligned__(x)))
224 #define __section(x) __attribute__((__section__(x)))
228 #if !__GNUC_PREREQ__(2, 95)
229 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
233 * Keywords added in C11.
235 #if defined(__cplusplus) && __cplusplus >= 201103L
236 #define _Alignas(e) alignas(e)
237 #define _Alignof(e) alignof(e)
238 #define _Noreturn [[noreturn]]
239 #define _Static_assert(e, s) static_assert(e, s)
240 /* FIXME: change this to thread_local when clang in base supports it */
241 #define _Thread_local __thread
242 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
243 /* Do nothing. They are language keywords. */
245 /* Not supported. Implement them using our versions. */
246 #define _Alignas(x) __aligned(x)
247 #define _Alignof(x) __alignof(x)
248 #define _Noreturn __dead2
249 #define _Thread_local __thread
251 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
252 #define __Static_assert(x, y) ___Static_assert(x, y)
253 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1]
255 #define _Static_assert(x, y) struct __hack
260 * Emulation of C11 _Generic(). Unlike the previously defined C11
261 * keywords, it is not possible to implement this using exactly the same
262 * syntax. Therefore implement something similar under the name
263 * __generic(). Unlike _Generic(), this macro can only distinguish
264 * between a single type, so it requires nested invocations to
265 * distinguish multiple cases.
268 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
269 #define __generic(expr, t, yes, no) \
270 _Generic(expr, t: yes, default: no)
271 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
272 #define __generic(expr, t, yes, no) \
273 __builtin_choose_expr( \
274 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
277 #if __GNUC_PREREQ__(2, 96)
278 #define __malloc_like __attribute__((__malloc__))
279 #define __pure __attribute__((__pure__))
281 #define __malloc_like
285 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
286 #define __always_inline __attribute__((__always_inline__))
288 #define __always_inline
291 #if __GNUC_PREREQ__(3, 1)
292 #define __noinline __attribute__ ((__noinline__))
297 #if __GNUC_PREREQ__(3, 3)
298 #define __nonnull(x) __attribute__((__nonnull__(x)))
303 #if __GNUC_PREREQ__(3, 4)
304 #define __fastcall __attribute__((__fastcall__))
309 #if __GNUC_PREREQ__(4, 1)
310 #define __returns_twice __attribute__((__returns_twice__))
312 #define __returns_twice
315 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
316 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
317 #define __func__ NULL
320 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
321 #define __LONG_LONG_SUPPORTED
324 /* C++11 exposes a load of C99 stuff */
325 #if defined(__cplusplus) && __cplusplus >= 201103L
326 #define __LONG_LONG_SUPPORTED
327 #ifndef __STDC_LIMIT_MACROS
328 #define __STDC_LIMIT_MACROS
330 #ifndef __STDC_CONSTANT_MACROS
331 #define __STDC_CONSTANT_MACROS
336 * GCC 2.95 provides `__restrict' as an extension to C90 to support the
337 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as
338 * a way to define the `restrict' type qualifier without disturbing older
339 * software that is unaware of C99 keywords.
341 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
342 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
345 #define __restrict restrict
350 * GNU C version 2.96 adds explicit branch prediction so that
351 * the CPU back-end can hint the processor and also so that
352 * code blocks can be reordered such that the predicted path
353 * sees a more linear flow, thus improving cache behavior, etc.
355 * The following two macros provide us with a way to utilize this
356 * compiler feature. Use __predict_true() if you expect the expression
357 * to evaluate to true, and __predict_false() if you expect the
358 * expression to evaluate to false.
360 * A few notes about usage:
362 * * Generally, __predict_false() error condition checks (unless
363 * you have some _strong_ reason to do otherwise, in which case
364 * document it), and/or __predict_true() `no-error' condition
365 * checks, assuming you want to optimize for the no-error case.
367 * * Other than that, if you don't know the likelihood of a test
368 * succeeding from empirical or other `hard' evidence, don't
371 * * These are meant to be used in places that are run `a lot'.
372 * It is wasteful to make predictions in code that is run
373 * seldomly (e.g. at subsystem initialization time) as the
374 * basic block reordering that this affects can often generate
377 #if __GNUC_PREREQ__(2, 96)
378 #define __predict_true(exp) __builtin_expect((exp), 1)
379 #define __predict_false(exp) __builtin_expect((exp), 0)
381 #define __predict_true(exp) (exp)
382 #define __predict_false(exp) (exp)
385 #if __GNUC_PREREQ__(4, 2)
386 #define __hidden __attribute__((__visibility__("hidden")))
387 #define __exported __attribute__((__visibility__("default")))
394 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
397 #if __GNUC_PREREQ__(4, 1)
398 #define __offsetof(type, field) __builtin_offsetof(type, field)
401 #define __offsetof(type, field) \
402 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
404 #define __offsetof(type, field) \
405 (__offsetof__ (reinterpret_cast <__size_t> \
406 (&reinterpret_cast <const volatile char &> \
407 (static_cast<type *> (0)->field))))
410 #define __rangeof(type, start, end) \
411 (__offsetof(type, end) - __offsetof(type, start))
414 * Given the pointer x to the member m of the struct s, return
415 * a pointer to the containing structure. When using GCC, we first
416 * assign pointer x to a local variable, to check that its type is
417 * compatible with member m.
419 #if __GNUC_PREREQ__(3, 1)
420 #define __containerof(x, s, m) ({ \
421 const volatile __typeof(((s *)0)->m) *__x = (x); \
422 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
425 #define __containerof(x, s, m) \
426 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
430 * Compiler-dependent macros to declare that functions take printf-like
431 * or scanf-like arguments. They are null except for versions of gcc
432 * that are known to support the features properly (old versions of gcc-2
433 * didn't permit keeping the keywords out of the application namespace).
435 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
436 #define __printflike(fmtarg, firstvararg)
437 #define __scanflike(fmtarg, firstvararg)
438 #define __format_arg(fmtarg)
439 #define __strfmonlike(fmtarg, firstvararg)
440 #define __strftimelike(fmtarg, firstvararg)
442 #define __printflike(fmtarg, firstvararg) \
443 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
444 #define __scanflike(fmtarg, firstvararg) \
445 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
446 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
447 #define __strfmonlike(fmtarg, firstvararg) \
448 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
449 #define __strftimelike(fmtarg, firstvararg) \
450 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
453 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
454 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
455 #define __printf0like(fmtarg, firstvararg) \
456 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
458 #define __printf0like(fmtarg, firstvararg)
461 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
462 #ifndef __INTEL_COMPILER
463 #define __strong_reference(sym,aliassym) \
464 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
467 #define __weak_reference(sym,alias) \
468 __asm__(".weak " #alias); \
469 __asm__(".equ " #alias ", " #sym)
470 #define __warn_references(sym,msg) \
471 __asm__(".section .gnu.warning." #sym); \
472 __asm__(".asciz \"" msg "\""); \
474 #define __sym_compat(sym,impl,verid) \
475 __asm__(".symver " #impl ", " #sym "@" #verid)
476 #define __sym_default(sym,impl,verid) \
477 __asm__(".symver " #impl ", " #sym "@@" #verid)
479 #define __weak_reference(sym,alias) \
480 __asm__(".weak alias"); \
481 __asm__(".equ alias, sym")
482 #define __warn_references(sym,msg) \
483 __asm__(".section .gnu.warning.sym"); \
484 __asm__(".asciz \"msg\""); \
486 #define __sym_compat(sym,impl,verid) \
487 __asm__(".symver impl, sym@verid")
488 #define __sym_default(impl,sym,verid) \
489 __asm__(".symver impl, sym@@verid")
490 #endif /* __STDC__ */
491 #endif /* __GNUC__ || __INTEL_COMPILER */
493 #define __GLOBL1(sym) __asm__(".globl " #sym)
494 #define __GLOBL(sym) __GLOBL1(sym)
496 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
497 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
500 * The following definition might not work well if used in header files,
501 * but it should be better than nothing. If you want a "do nothing"
502 * version, then it should generate some harmless declaration, such as:
503 * #define __IDSTRING(name,string) struct __hack
505 #define __IDSTRING(name,string) static const char name[] __unused = string
509 * Embed the rcs id of a source file in the resulting library. Note that in
510 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
512 * __FBSDID("$FreeBSD$");
515 #if !defined(lint) && !defined(STRIP_FBSDID)
516 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
518 #define __FBSDID(s) struct __hack
524 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
526 #define __RCSID(s) struct __hack
530 #ifndef __RCSID_SOURCE
531 #ifndef NO__RCSID_SOURCE
532 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
534 #define __RCSID_SOURCE(s) struct __hack
540 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
542 #define __SCCSID(s) struct __hack
547 #ifndef NO__COPYRIGHT
548 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
550 #define __COPYRIGHT(s) struct __hack
555 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
559 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
563 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
567 * The following definitions are an extension of the behavior originally
568 * implemented in <sys/_posix.h>, but with a different level of granularity.
569 * POSIX.1 requires that the macros we test be defined before any standard
570 * header file is included.
572 * Here's a quick run-down of the versions:
573 * defined(_POSIX_SOURCE) 1003.1-1988
574 * _POSIX_C_SOURCE == 1 1003.1-1990
575 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
576 * _POSIX_C_SOURCE == 199309 1003.1b-1993
577 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
578 * and the omnibus ISO/IEC 9945-1: 1996
579 * _POSIX_C_SOURCE == 200112 1003.1-2001
580 * _POSIX_C_SOURCE == 200809 1003.1-2008
582 * In addition, the X/Open Portability Guide, which is now the Single UNIX
583 * Specification, defines a feature-test macro which indicates the version of
584 * that specification, and which subsumes _POSIX_C_SOURCE.
586 * Our macros begin with two underscores to avoid namespace screwage.
589 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
590 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
591 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
592 #define _POSIX_C_SOURCE 199009
595 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
596 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
597 #undef _POSIX_C_SOURCE
598 #define _POSIX_C_SOURCE 199209
601 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
603 #if _XOPEN_SOURCE - 0 >= 700
604 #define __XSI_VISIBLE 700
605 #undef _POSIX_C_SOURCE
606 #define _POSIX_C_SOURCE 200809
607 #elif _XOPEN_SOURCE - 0 >= 600
608 #define __XSI_VISIBLE 600
609 #undef _POSIX_C_SOURCE
610 #define _POSIX_C_SOURCE 200112
611 #elif _XOPEN_SOURCE - 0 >= 500
612 #define __XSI_VISIBLE 500
613 #undef _POSIX_C_SOURCE
614 #define _POSIX_C_SOURCE 199506
619 * Deal with all versions of POSIX. The ordering relative to the tests above is
622 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
623 #define _POSIX_C_SOURCE 198808
625 #ifdef _POSIX_C_SOURCE
626 #if _POSIX_C_SOURCE >= 200809
627 #define __POSIX_VISIBLE 200809
628 #define __ISO_C_VISIBLE 1999
629 #elif _POSIX_C_SOURCE >= 200112
630 #define __POSIX_VISIBLE 200112
631 #define __ISO_C_VISIBLE 1999
632 #elif _POSIX_C_SOURCE >= 199506
633 #define __POSIX_VISIBLE 199506
634 #define __ISO_C_VISIBLE 1990
635 #elif _POSIX_C_SOURCE >= 199309
636 #define __POSIX_VISIBLE 199309
637 #define __ISO_C_VISIBLE 1990
638 #elif _POSIX_C_SOURCE >= 199209
639 #define __POSIX_VISIBLE 199209
640 #define __ISO_C_VISIBLE 1990
641 #elif _POSIX_C_SOURCE >= 199009
642 #define __POSIX_VISIBLE 199009
643 #define __ISO_C_VISIBLE 1990
645 #define __POSIX_VISIBLE 198808
646 #define __ISO_C_VISIBLE 0
647 #endif /* _POSIX_C_SOURCE */
650 * Deal with _ANSI_SOURCE:
651 * If it is defined, and no other compilation environment is explicitly
652 * requested, then define our internal feature-test macros to zero. This
653 * makes no difference to the preprocessor (undefined symbols in preprocessing
654 * expressions are defined to have value zero), but makes it more convenient for
655 * a test program to print out the values.
657 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
658 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
659 * environment (and in fact we will never get here).
661 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
662 #define __POSIX_VISIBLE 0
663 #define __XSI_VISIBLE 0
664 #define __BSD_VISIBLE 0
665 #define __ISO_C_VISIBLE 1990
666 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
667 #define __POSIX_VISIBLE 0
668 #define __XSI_VISIBLE 0
669 #define __BSD_VISIBLE 0
670 #define __ISO_C_VISIBLE 1999
671 #else /* Default environment: show everything. */
672 #define __POSIX_VISIBLE 200809
673 #define __XSI_VISIBLE 700
674 #define __BSD_VISIBLE 1
675 #define __ISO_C_VISIBLE 1999
679 #ifndef __has_extension
680 #define __has_extension __has_feature
682 #ifndef __has_feature
683 #define __has_feature(x) 0
685 #ifndef __has_include
686 #define __has_include(x) 0
688 #ifndef __has_builtin
689 #define __has_builtin(x) 0
692 #if defined(__mips) || defined(__powerpc64__) || defined(__arm__)
696 #endif /* !_SYS_CDEFS_H_ */