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
85 #ifndef __INTEL_COMPILER
86 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
87 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
90 #define __GNUCLIKE_BUILTIN_MEMCPY 1
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
97 #define __CC_SUPPORTS___FUNC__ 1
98 #define __CC_SUPPORTS_WARNING 1
100 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
102 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
104 #endif /* __GNUC__ || __INTEL_COMPILER */
107 * Macro to test if we're using a specific version of gcc or later.
109 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
110 #define __GNUC_PREREQ__(ma, mi) \
111 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
113 #define __GNUC_PREREQ__(ma, mi) 0
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.
125 * __XSTRING is like __STRING, but it expands any macros in its argument
126 * first. It is only available with ANSI C.
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 */
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 */
141 #if !(defined(__CC_SUPPORTS___INLINE))
142 #define __inline /* delete GCC keyword */
143 #endif /* ! __CC_SUPPORTS___INLINE */
144 #endif /* !__cplusplus */
146 #else /* !(__STDC__ || __cplusplus) */
147 #define __P(protos) () /* traditional C preprocessor */
148 #define __CONCAT(x,y) x/**/y
149 #define __STRING(x) "x"
151 #if !defined(__CC_SUPPORTS___INLINE)
152 #define __const /* delete pseudo-ANSI C keywords */
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.
164 #ifndef NO_ANSI_KEYWORDS
165 #define const /* delete ANSI C keywords */
169 #endif /* !NO_ANSI_KEYWORDS */
170 #endif /* !__CC_SUPPORTS___INLINE */
171 #endif /* !(__STDC__ || __cplusplus) */
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.
190 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
195 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
196 #define __dead2 __attribute__((__noreturn__))
197 #define __pure2 __attribute__((__const__))
199 /* XXX Find out what to do for __packed, __aligned and __section */
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)))
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)))
221 #if !__GNUC_PREREQ__(2, 95)
222 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
226 * Keywords added in C11.
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. */
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
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]
248 #define _Static_assert(x, y) struct __hack
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.
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)
270 #if __GNUC_PREREQ__(2, 96)
271 #define __malloc_like __attribute__((__malloc__))
272 #define __pure __attribute__((__pure__))
274 #define __malloc_like
278 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
279 #define __always_inline __attribute__((__always_inline__))
281 #define __always_inline
284 #if __GNUC_PREREQ__(3, 1)
285 #define __noinline __attribute__ ((__noinline__))
290 #if __GNUC_PREREQ__(3, 3)
291 #define __nonnull(x) __attribute__((__nonnull__(x)))
296 #if __GNUC_PREREQ__(3, 4)
297 #define __fastcall __attribute__((__fastcall__))
302 #if __GNUC_PREREQ__(4, 1)
303 #define __returns_twice __attribute__((__returns_twice__))
305 #define __returns_twice
308 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
309 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
310 #define __func__ NULL
313 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
314 #define __LONG_LONG_SUPPORTED
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
323 #ifndef __STDC_CONSTANT_MACROS
324 #define __STDC_CONSTANT_MACROS
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.
334 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
335 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
338 #define __restrict restrict
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.
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.
353 * A few notes about usage:
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.
360 * * Other than that, if you don't know the likelihood of a test
361 * succeeding from empirical or other `hard' evidence, don't
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
370 #if __GNUC_PREREQ__(2, 96)
371 #define __predict_true(exp) __builtin_expect((exp), 1)
372 #define __predict_false(exp) __builtin_expect((exp), 0)
374 #define __predict_true(exp) (exp)
375 #define __predict_false(exp) (exp)
378 #if __GNUC_PREREQ__(4, 2)
379 #define __hidden __attribute__((__visibility__("hidden")))
380 #define __exported __attribute__((__visibility__("default")))
387 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
390 #if __GNUC_PREREQ__(4, 1)
391 #define __offsetof(type, field) __builtin_offsetof(type, field)
394 #define __offsetof(type, field) \
395 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
397 #define __offsetof(type, field) \
398 (__offsetof__ (reinterpret_cast <__size_t> \
399 (&reinterpret_cast <const volatile char &> \
400 (static_cast<type *> (0)->field))))
403 #define __rangeof(type, start, end) \
404 (__offsetof(type, end) - __offsetof(type, start))
407 * Given the pointer x to the member m of the struct s, return
408 * a pointer to the containing structure. When using GCC, we first
409 * assign pointer x to a local variable, to check that its type is
410 * compatible with member m.
412 #if __GNUC_PREREQ__(3, 1)
413 #define __containerof(x, s, m) ({ \
414 const volatile __typeof(((s *)0)->m) *__x = (x); \
415 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
418 #define __containerof(x, s, m) \
419 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
423 * Compiler-dependent macros to declare that functions take printf-like
424 * or scanf-like arguments. They are null except for versions of gcc
425 * that are known to support the features properly (old versions of gcc-2
426 * didn't permit keeping the keywords out of the application namespace).
428 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
429 #define __printflike(fmtarg, firstvararg)
430 #define __scanflike(fmtarg, firstvararg)
431 #define __format_arg(fmtarg)
432 #define __strfmonlike(fmtarg, firstvararg)
433 #define __strftimelike(fmtarg, firstvararg)
435 #define __printflike(fmtarg, firstvararg) \
436 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
437 #define __scanflike(fmtarg, firstvararg) \
438 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
439 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
440 #define __strfmonlike(fmtarg, firstvararg) \
441 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
442 #define __strftimelike(fmtarg, firstvararg) \
443 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
446 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
447 #if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
448 #define __printf0like(fmtarg, firstvararg) \
449 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
451 #define __printf0like(fmtarg, firstvararg)
454 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
455 #ifndef __INTEL_COMPILER
456 #define __strong_reference(sym,aliassym) \
457 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
460 #define __weak_reference(sym,alias) \
461 __asm__(".weak " #alias); \
462 __asm__(".equ " #alias ", " #sym)
463 #define __warn_references(sym,msg) \
464 __asm__(".section .gnu.warning." #sym); \
465 __asm__(".asciz \"" msg "\""); \
467 #define __sym_compat(sym,impl,verid) \
468 __asm__(".symver " #impl ", " #sym "@" #verid)
469 #define __sym_default(sym,impl,verid) \
470 __asm__(".symver " #impl ", " #sym "@@" #verid)
472 #define __weak_reference(sym,alias) \
473 __asm__(".weak alias"); \
474 __asm__(".equ alias, sym")
475 #define __warn_references(sym,msg) \
476 __asm__(".section .gnu.warning.sym"); \
477 __asm__(".asciz \"msg\""); \
479 #define __sym_compat(sym,impl,verid) \
480 __asm__(".symver impl, sym@verid")
481 #define __sym_default(impl,sym,verid) \
482 __asm__(".symver impl, sym@@verid")
483 #endif /* __STDC__ */
484 #endif /* __GNUC__ || __INTEL_COMPILER */
486 #define __GLOBL1(sym) __asm__(".globl " #sym)
487 #define __GLOBL(sym) __GLOBL1(sym)
489 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
490 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
493 * The following definition might not work well if used in header files,
494 * but it should be better than nothing. If you want a "do nothing"
495 * version, then it should generate some harmless declaration, such as:
496 * #define __IDSTRING(name,string) struct __hack
498 #define __IDSTRING(name,string) static const char name[] __unused = string
502 * Embed the rcs id of a source file in the resulting library. Note that in
503 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
505 * __FBSDID("$FreeBSD$");
508 #if !defined(lint) && !defined(STRIP_FBSDID)
509 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
511 #define __FBSDID(s) struct __hack
517 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
519 #define __RCSID(s) struct __hack
523 #ifndef __RCSID_SOURCE
524 #ifndef NO__RCSID_SOURCE
525 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
527 #define __RCSID_SOURCE(s) struct __hack
533 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
535 #define __SCCSID(s) struct __hack
540 #ifndef NO__COPYRIGHT
541 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
543 #define __COPYRIGHT(s) struct __hack
548 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
552 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
556 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
560 * The following definitions are an extension of the behavior originally
561 * implemented in <sys/_posix.h>, but with a different level of granularity.
562 * POSIX.1 requires that the macros we test be defined before any standard
563 * header file is included.
565 * Here's a quick run-down of the versions:
566 * defined(_POSIX_SOURCE) 1003.1-1988
567 * _POSIX_C_SOURCE == 1 1003.1-1990
568 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
569 * _POSIX_C_SOURCE == 199309 1003.1b-1993
570 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
571 * and the omnibus ISO/IEC 9945-1: 1996
572 * _POSIX_C_SOURCE == 200112 1003.1-2001
573 * _POSIX_C_SOURCE == 200809 1003.1-2008
575 * In addition, the X/Open Portability Guide, which is now the Single UNIX
576 * Specification, defines a feature-test macro which indicates the version of
577 * that specification, and which subsumes _POSIX_C_SOURCE.
579 * Our macros begin with two underscores to avoid namespace screwage.
582 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
583 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
584 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
585 #define _POSIX_C_SOURCE 199009
588 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
589 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
590 #undef _POSIX_C_SOURCE
591 #define _POSIX_C_SOURCE 199209
594 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
596 #if _XOPEN_SOURCE - 0 >= 700
597 #define __XSI_VISIBLE 700
598 #undef _POSIX_C_SOURCE
599 #define _POSIX_C_SOURCE 200809
600 #elif _XOPEN_SOURCE - 0 >= 600
601 #define __XSI_VISIBLE 600
602 #undef _POSIX_C_SOURCE
603 #define _POSIX_C_SOURCE 200112
604 #elif _XOPEN_SOURCE - 0 >= 500
605 #define __XSI_VISIBLE 500
606 #undef _POSIX_C_SOURCE
607 #define _POSIX_C_SOURCE 199506
612 * Deal with all versions of POSIX. The ordering relative to the tests above is
615 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
616 #define _POSIX_C_SOURCE 198808
618 #ifdef _POSIX_C_SOURCE
619 #if _POSIX_C_SOURCE >= 200809
620 #define __POSIX_VISIBLE 200809
621 #define __ISO_C_VISIBLE 1999
622 #elif _POSIX_C_SOURCE >= 200112
623 #define __POSIX_VISIBLE 200112
624 #define __ISO_C_VISIBLE 1999
625 #elif _POSIX_C_SOURCE >= 199506
626 #define __POSIX_VISIBLE 199506
627 #define __ISO_C_VISIBLE 1990
628 #elif _POSIX_C_SOURCE >= 199309
629 #define __POSIX_VISIBLE 199309
630 #define __ISO_C_VISIBLE 1990
631 #elif _POSIX_C_SOURCE >= 199209
632 #define __POSIX_VISIBLE 199209
633 #define __ISO_C_VISIBLE 1990
634 #elif _POSIX_C_SOURCE >= 199009
635 #define __POSIX_VISIBLE 199009
636 #define __ISO_C_VISIBLE 1990
638 #define __POSIX_VISIBLE 198808
639 #define __ISO_C_VISIBLE 0
640 #endif /* _POSIX_C_SOURCE */
643 * Deal with _ANSI_SOURCE:
644 * If it is defined, and no other compilation environment is explicitly
645 * requested, then define our internal feature-test macros to zero. This
646 * makes no difference to the preprocessor (undefined symbols in preprocessing
647 * expressions are defined to have value zero), but makes it more convenient for
648 * a test program to print out the values.
650 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
651 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
652 * environment (and in fact we will never get here).
654 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
655 #define __POSIX_VISIBLE 0
656 #define __XSI_VISIBLE 0
657 #define __BSD_VISIBLE 0
658 #define __ISO_C_VISIBLE 1990
659 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
660 #define __POSIX_VISIBLE 0
661 #define __XSI_VISIBLE 0
662 #define __BSD_VISIBLE 0
663 #define __ISO_C_VISIBLE 1999
664 #else /* Default environment: show everything. */
665 #define __POSIX_VISIBLE 200809
666 #define __XSI_VISIBLE 700
667 #define __BSD_VISIBLE 1
668 #define __ISO_C_VISIBLE 1999
672 #ifndef __has_feature
673 #define __has_feature(x) 0
675 #ifndef __has_include
676 #define __has_include(x) 0
678 #ifndef __has_builtin
679 #define __has_builtin(x) 0
682 #if defined(__mips) || defined(__powerpc64__) || defined(__arm__)
686 #endif /* !_SYS_CDEFS_H_ */