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
40 * Testing against Clang-specific extensions.
43 #ifndef __has_extension
44 #define __has_extension __has_feature
47 #define __has_feature(x) 0
50 #define __has_include(x) 0
53 #define __has_builtin(x) 0
56 #if defined(__cplusplus)
57 #define __BEGIN_DECLS extern "C" {
65 * This code has been put in place to help reduce the addition of
66 * compiler specific defines in FreeBSD code. It helps to aid in
67 * having a compiler-agnostic source tree.
70 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
72 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
73 #define __GNUCLIKE_ASM 3
74 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
76 #define __GNUCLIKE_ASM 2
78 #define __GNUCLIKE___TYPEOF 1
79 #define __GNUCLIKE___OFFSETOF 1
80 #define __GNUCLIKE___SECTION 1
82 #ifndef __INTEL_COMPILER
83 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
86 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
87 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
88 && __INTEL_COMPILER < 800
89 # undef __GNUCLIKE_BUILTIN_CONSTANT_P
92 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) && !defined(__INTEL_COMPILER)
93 # define __GNUCLIKE_BUILTIN_VARARGS 1
94 # define __GNUCLIKE_BUILTIN_STDARG 1
95 # define __GNUCLIKE_BUILTIN_VAALIST 1
99 # define __GNUC_VA_LIST_COMPATIBILITY 1
103 * Compiler memory barriers, specific to gcc and clang.
105 #if defined(__GNUC__)
106 #define __compiler_membar() __asm __volatile(" " : : : "memory")
109 #ifndef __INTEL_COMPILER
110 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
111 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
114 #define __GNUCLIKE_BUILTIN_MEMCPY 1
116 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
117 #define __CC_SUPPORTS_INLINE 1
118 #define __CC_SUPPORTS___INLINE 1
119 #define __CC_SUPPORTS___INLINE__ 1
121 #define __CC_SUPPORTS___FUNC__ 1
122 #define __CC_SUPPORTS_WARNING 1
124 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
126 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
128 #endif /* __GNUC__ || __INTEL_COMPILER */
131 * Macro to test if we're using a specific version of gcc or later.
133 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
134 #define __GNUC_PREREQ__(ma, mi) \
135 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
137 #define __GNUC_PREREQ__(ma, mi) 0
141 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
142 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
143 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
144 * mode -- there must be no spaces between its arguments, and for nested
145 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
146 * concatenate double-quoted strings produced by the __STRING macro, but
147 * this only works with ANSI C.
149 * __XSTRING is like __STRING, but it expands any macros in its argument
150 * first. It is only available with ANSI C.
152 #if defined(__STDC__) || defined(__cplusplus)
153 #define __P(protos) protos /* full-blown ANSI C */
154 #define __CONCAT1(x,y) x ## y
155 #define __CONCAT(x,y) __CONCAT1(x,y)
156 #define __STRING(x) #x /* stringify without expanding x */
157 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
159 #define __const const /* define reserved names to standard */
160 #define __signed signed
161 #define __volatile volatile
162 #if defined(__cplusplus)
163 #define __inline inline /* convert to C++ keyword */
165 #if !(defined(__CC_SUPPORTS___INLINE))
166 #define __inline /* delete GCC keyword */
167 #endif /* ! __CC_SUPPORTS___INLINE */
168 #endif /* !__cplusplus */
170 #else /* !(__STDC__ || __cplusplus) */
171 #define __P(protos) () /* traditional C preprocessor */
172 #define __CONCAT(x,y) x/**/y
173 #define __STRING(x) "x"
175 #if !defined(__CC_SUPPORTS___INLINE)
176 #define __const /* delete pseudo-ANSI C keywords */
181 * In non-ANSI C environments, new programs will want ANSI-only C keywords
182 * deleted from the program and old programs will want them left alone.
183 * When using a compiler other than gcc, programs using the ANSI C keywords
184 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
185 * When using "gcc -traditional", we assume that this is the intent; if
186 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
188 #ifndef NO_ANSI_KEYWORDS
189 #define const /* delete ANSI C keywords */
193 #endif /* !NO_ANSI_KEYWORDS */
194 #endif /* !__CC_SUPPORTS___INLINE */
195 #endif /* !(__STDC__ || __cplusplus) */
198 * Compiler-dependent macros to help declare dead (non-returning) and
199 * pure (no side effects) functions, and unused variables. They are
200 * null except for versions of gcc that are known to support the features
201 * properly (old versions of gcc-2 supported the dead and pure features
202 * in a different (wrong) way). If we do not provide an implementation
203 * for a given compiler, let the compile fail if it is told to use
204 * a feature that we cannot live without.
214 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
219 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
220 #define __dead2 __attribute__((__noreturn__))
221 #define __pure2 __attribute__((__const__))
223 /* XXX Find out what to do for __packed, __aligned and __section */
225 #if __GNUC_PREREQ__(2, 7)
226 #define __dead2 __attribute__((__noreturn__))
227 #define __pure2 __attribute__((__const__))
228 #define __unused __attribute__((__unused__))
229 #define __used __attribute__((__used__))
230 #define __packed __attribute__((__packed__))
231 #define __aligned(x) __attribute__((__aligned__(x)))
232 #define __section(x) __attribute__((__section__(x)))
234 #if defined(__INTEL_COMPILER)
235 #define __dead2 __attribute__((__noreturn__))
236 #define __pure2 __attribute__((__const__))
237 #define __unused __attribute__((__unused__))
238 #define __used __attribute__((__used__))
239 #define __packed __attribute__((__packed__))
240 #define __aligned(x) __attribute__((__aligned__(x)))
241 #define __section(x) __attribute__((__section__(x)))
245 #if !__GNUC_PREREQ__(2, 95)
246 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
250 * Keywords added in C11.
253 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
255 #if !__has_extension(c_alignas)
256 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
257 __has_extension(cxx_alignas)
258 #define _Alignas(x) alignas(x)
260 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
261 #define _Alignas(x) __aligned(x)
265 #if defined(__cplusplus) && __cplusplus >= 201103L
266 #define _Alignof(x) alignof(x)
268 #define _Alignof(x) __alignof(x)
271 #if !__has_extension(c_atomic) && !__has_extension(cxx_atomic)
273 * No native support for _Atomic(). Place object in structure to prevent
274 * most forms of direct non-atomic access.
276 #define _Atomic(T) struct { T volatile __val; }
279 #if defined(__cplusplus) && __cplusplus >= 201103L
280 #define _Noreturn [[noreturn]]
282 #define _Noreturn __dead2
285 #if !__has_extension(c_static_assert)
286 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
287 __has_extension(cxx_static_assert)
288 #define _Static_assert(x, y) static_assert(x, y)
289 #elif defined(__COUNTER__)
290 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
291 #define __Static_assert(x, y) ___Static_assert(x, y)
292 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1]
294 #define _Static_assert(x, y) struct __hack
298 #if !__has_extension(c_thread_local)
299 /* XXX: Change this to test against C++11 when clang in base supports it. */
300 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
301 __has_extension(cxx_thread_local)
302 #define _Thread_local thread_local
304 #define _Thread_local __thread
308 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
311 * Emulation of C11 _Generic(). Unlike the previously defined C11
312 * keywords, it is not possible to implement this using exactly the same
313 * syntax. Therefore implement something similar under the name
314 * __generic(). Unlike _Generic(), this macro can only distinguish
315 * between a single type, so it requires nested invocations to
316 * distinguish multiple cases.
319 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
320 #define __generic(expr, t, yes, no) \
321 _Generic(expr, t: yes, default: no)
322 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
323 #define __generic(expr, t, yes, no) \
324 __builtin_choose_expr( \
325 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
328 #if __GNUC_PREREQ__(2, 96)
329 #define __malloc_like __attribute__((__malloc__))
330 #define __pure __attribute__((__pure__))
332 #define __malloc_like
336 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
337 #define __always_inline __attribute__((__always_inline__))
339 #define __always_inline
342 #if __GNUC_PREREQ__(3, 1)
343 #define __noinline __attribute__ ((__noinline__))
348 #if __GNUC_PREREQ__(3, 3)
349 #define __nonnull(x) __attribute__((__nonnull__(x)))
354 #if __GNUC_PREREQ__(3, 4)
355 #define __fastcall __attribute__((__fastcall__))
360 #if __GNUC_PREREQ__(4, 1)
361 #define __returns_twice __attribute__((__returns_twice__))
363 #define __returns_twice
366 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
367 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
368 #define __func__ NULL
371 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
372 #define __LONG_LONG_SUPPORTED
375 /* C++11 exposes a load of C99 stuff */
376 #if defined(__cplusplus) && __cplusplus >= 201103L
377 #define __LONG_LONG_SUPPORTED
378 #ifndef __STDC_LIMIT_MACROS
379 #define __STDC_LIMIT_MACROS
381 #ifndef __STDC_CONSTANT_MACROS
382 #define __STDC_CONSTANT_MACROS
387 * GCC 2.95 provides `__restrict' as an extension to C90 to support the
388 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as
389 * a way to define the `restrict' type qualifier without disturbing older
390 * software that is unaware of C99 keywords.
392 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
393 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
396 #define __restrict restrict
401 * GNU C version 2.96 adds explicit branch prediction so that
402 * the CPU back-end can hint the processor and also so that
403 * code blocks can be reordered such that the predicted path
404 * sees a more linear flow, thus improving cache behavior, etc.
406 * The following two macros provide us with a way to utilize this
407 * compiler feature. Use __predict_true() if you expect the expression
408 * to evaluate to true, and __predict_false() if you expect the
409 * expression to evaluate to false.
411 * A few notes about usage:
413 * * Generally, __predict_false() error condition checks (unless
414 * you have some _strong_ reason to do otherwise, in which case
415 * document it), and/or __predict_true() `no-error' condition
416 * checks, assuming you want to optimize for the no-error case.
418 * * Other than that, if you don't know the likelihood of a test
419 * succeeding from empirical or other `hard' evidence, don't
422 * * These are meant to be used in places that are run `a lot'.
423 * It is wasteful to make predictions in code that is run
424 * seldomly (e.g. at subsystem initialization time) as the
425 * basic block reordering that this affects can often generate
428 #if __GNUC_PREREQ__(2, 96)
429 #define __predict_true(exp) __builtin_expect((exp), 1)
430 #define __predict_false(exp) __builtin_expect((exp), 0)
432 #define __predict_true(exp) (exp)
433 #define __predict_false(exp) (exp)
436 #if __GNUC_PREREQ__(4, 2)
437 #define __hidden __attribute__((__visibility__("hidden")))
438 #define __exported __attribute__((__visibility__("default")))
445 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
448 #if __GNUC_PREREQ__(4, 1)
449 #define __offsetof(type, field) __builtin_offsetof(type, field)
452 #define __offsetof(type, field) \
453 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
455 #define __offsetof(type, field) \
456 (__offsetof__ (reinterpret_cast <__size_t> \
457 (&reinterpret_cast <const volatile char &> \
458 (static_cast<type *> (0)->field))))
461 #define __rangeof(type, start, end) \
462 (__offsetof(type, end) - __offsetof(type, start))
465 * Given the pointer x to the member m of the struct s, return
466 * a pointer to the containing structure. When using GCC, we first
467 * assign pointer x to a local variable, to check that its type is
468 * compatible with member m.
470 #if __GNUC_PREREQ__(3, 1)
471 #define __containerof(x, s, m) ({ \
472 const volatile __typeof(((s *)0)->m) *__x = (x); \
473 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
476 #define __containerof(x, s, m) \
477 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
481 * Compiler-dependent macros to declare that functions take printf-like
482 * or scanf-like arguments. They are null except for versions of gcc
483 * that are known to support the features properly (old versions of gcc-2
484 * didn't permit keeping the keywords out of the application namespace).
486 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
487 #define __printflike(fmtarg, firstvararg)
488 #define __scanflike(fmtarg, firstvararg)
489 #define __format_arg(fmtarg)
490 #define __strfmonlike(fmtarg, firstvararg)
491 #define __strftimelike(fmtarg, firstvararg)
493 #define __printflike(fmtarg, firstvararg) \
494 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
495 #define __scanflike(fmtarg, firstvararg) \
496 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
497 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
498 #define __strfmonlike(fmtarg, firstvararg) \
499 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
500 #define __strftimelike(fmtarg, firstvararg) \
501 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
504 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
505 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
506 defined(__GNUC__) && !defined(__INTEL_COMPILER)
507 #define __printf0like(fmtarg, firstvararg) \
508 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
510 #define __printf0like(fmtarg, firstvararg)
513 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
514 #ifndef __INTEL_COMPILER
515 #define __strong_reference(sym,aliassym) \
516 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
519 #define __weak_reference(sym,alias) \
520 __asm__(".weak " #alias); \
521 __asm__(".equ " #alias ", " #sym)
522 #define __warn_references(sym,msg) \
523 __asm__(".section .gnu.warning." #sym); \
524 __asm__(".asciz \"" msg "\""); \
526 #define __sym_compat(sym,impl,verid) \
527 __asm__(".symver " #impl ", " #sym "@" #verid)
528 #define __sym_default(sym,impl,verid) \
529 __asm__(".symver " #impl ", " #sym "@@" #verid)
531 #define __weak_reference(sym,alias) \
532 __asm__(".weak alias"); \
533 __asm__(".equ alias, sym")
534 #define __warn_references(sym,msg) \
535 __asm__(".section .gnu.warning.sym"); \
536 __asm__(".asciz \"msg\""); \
538 #define __sym_compat(sym,impl,verid) \
539 __asm__(".symver impl, sym@verid")
540 #define __sym_default(impl,sym,verid) \
541 __asm__(".symver impl, sym@@verid")
542 #endif /* __STDC__ */
543 #endif /* __GNUC__ || __INTEL_COMPILER */
545 #define __GLOBL1(sym) __asm__(".globl " #sym)
546 #define __GLOBL(sym) __GLOBL1(sym)
548 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
549 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
552 * The following definition might not work well if used in header files,
553 * but it should be better than nothing. If you want a "do nothing"
554 * version, then it should generate some harmless declaration, such as:
555 * #define __IDSTRING(name,string) struct __hack
557 #define __IDSTRING(name,string) static const char name[] __unused = string
561 * Embed the rcs id of a source file in the resulting library. Note that in
562 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
564 * __FBSDID("$FreeBSD$");
567 #if !defined(lint) && !defined(STRIP_FBSDID)
568 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
570 #define __FBSDID(s) struct __hack
576 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
578 #define __RCSID(s) struct __hack
582 #ifndef __RCSID_SOURCE
583 #ifndef NO__RCSID_SOURCE
584 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
586 #define __RCSID_SOURCE(s) struct __hack
592 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
594 #define __SCCSID(s) struct __hack
599 #ifndef NO__COPYRIGHT
600 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
602 #define __COPYRIGHT(s) struct __hack
607 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
611 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
615 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
619 * The following definitions are an extension of the behavior originally
620 * implemented in <sys/_posix.h>, but with a different level of granularity.
621 * POSIX.1 requires that the macros we test be defined before any standard
622 * header file is included.
624 * Here's a quick run-down of the versions:
625 * defined(_POSIX_SOURCE) 1003.1-1988
626 * _POSIX_C_SOURCE == 1 1003.1-1990
627 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
628 * _POSIX_C_SOURCE == 199309 1003.1b-1993
629 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
630 * and the omnibus ISO/IEC 9945-1: 1996
631 * _POSIX_C_SOURCE == 200112 1003.1-2001
632 * _POSIX_C_SOURCE == 200809 1003.1-2008
634 * In addition, the X/Open Portability Guide, which is now the Single UNIX
635 * Specification, defines a feature-test macro which indicates the version of
636 * that specification, and which subsumes _POSIX_C_SOURCE.
638 * Our macros begin with two underscores to avoid namespace screwage.
641 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
642 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
643 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
644 #define _POSIX_C_SOURCE 199009
647 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
648 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
649 #undef _POSIX_C_SOURCE
650 #define _POSIX_C_SOURCE 199209
653 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
655 #if _XOPEN_SOURCE - 0 >= 700
656 #define __XSI_VISIBLE 700
657 #undef _POSIX_C_SOURCE
658 #define _POSIX_C_SOURCE 200809
659 #elif _XOPEN_SOURCE - 0 >= 600
660 #define __XSI_VISIBLE 600
661 #undef _POSIX_C_SOURCE
662 #define _POSIX_C_SOURCE 200112
663 #elif _XOPEN_SOURCE - 0 >= 500
664 #define __XSI_VISIBLE 500
665 #undef _POSIX_C_SOURCE
666 #define _POSIX_C_SOURCE 199506
671 * Deal with all versions of POSIX. The ordering relative to the tests above is
674 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
675 #define _POSIX_C_SOURCE 198808
677 #ifdef _POSIX_C_SOURCE
678 #if _POSIX_C_SOURCE >= 200809
679 #define __POSIX_VISIBLE 200809
680 #define __ISO_C_VISIBLE 1999
681 #elif _POSIX_C_SOURCE >= 200112
682 #define __POSIX_VISIBLE 200112
683 #define __ISO_C_VISIBLE 1999
684 #elif _POSIX_C_SOURCE >= 199506
685 #define __POSIX_VISIBLE 199506
686 #define __ISO_C_VISIBLE 1990
687 #elif _POSIX_C_SOURCE >= 199309
688 #define __POSIX_VISIBLE 199309
689 #define __ISO_C_VISIBLE 1990
690 #elif _POSIX_C_SOURCE >= 199209
691 #define __POSIX_VISIBLE 199209
692 #define __ISO_C_VISIBLE 1990
693 #elif _POSIX_C_SOURCE >= 199009
694 #define __POSIX_VISIBLE 199009
695 #define __ISO_C_VISIBLE 1990
697 #define __POSIX_VISIBLE 198808
698 #define __ISO_C_VISIBLE 0
699 #endif /* _POSIX_C_SOURCE */
702 * Deal with _ANSI_SOURCE:
703 * If it is defined, and no other compilation environment is explicitly
704 * requested, then define our internal feature-test macros to zero. This
705 * makes no difference to the preprocessor (undefined symbols in preprocessing
706 * expressions are defined to have value zero), but makes it more convenient for
707 * a test program to print out the values.
709 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
710 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
711 * environment (and in fact we will never get here).
713 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
714 #define __POSIX_VISIBLE 0
715 #define __XSI_VISIBLE 0
716 #define __BSD_VISIBLE 0
717 #define __ISO_C_VISIBLE 1990
718 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
719 #define __POSIX_VISIBLE 0
720 #define __XSI_VISIBLE 0
721 #define __BSD_VISIBLE 0
722 #define __ISO_C_VISIBLE 1999
723 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
724 #define __POSIX_VISIBLE 0
725 #define __XSI_VISIBLE 0
726 #define __BSD_VISIBLE 0
727 #define __ISO_C_VISIBLE 2011
728 #else /* Default environment: show everything. */
729 #define __POSIX_VISIBLE 200809
730 #define __XSI_VISIBLE 700
731 #define __BSD_VISIBLE 1
732 #define __ISO_C_VISIBLE 2011
736 #if defined(__mips) || defined(__powerpc64__)
740 #endif /* !_SYS_CDEFS_H_ */