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 * 3. 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
33 * $FreeBSD: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $
40 * Testing against Clang-specific extensions.
42 #ifndef __has_attribute
43 #define __has_attribute(x) 0
45 #ifndef __has_extension
46 #define __has_extension __has_feature
49 #define __has_feature(x) 0
52 #define __has_include(x) 0
55 #define __has_builtin(x) 0
59 * Macro to test if we are using a specific version of gcc or later.
61 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
62 #define __GNUC_PREREQ__(ma, mi) \
63 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
65 #define __GNUC_PREREQ__(ma, mi) 0
68 #if defined(__cplusplus)
69 #define __BEGIN_EXTERN_C extern "C" {
70 #define __END_EXTERN_C }
72 #define __BEGIN_EXTERN_C
73 #define __END_EXTERN_C
76 #if __GNUC_PREREQ__(4, 0)
77 #define __dso_public __attribute__((__visibility__("default")))
78 #define __dso_hidden __attribute__((__visibility__("hidden")))
79 #define __BEGIN_DECLS _Pragma("GCC visibility push(default)") __BEGIN_EXTERN_C
80 #define __END_DECLS __END_EXTERN_C _Pragma("GCC visibility pop")
81 #define __BEGIN_HIDDEN_DECLS \
82 _Pragma("GCC visibility push(hidden)") __BEGIN_EXTERN_C
83 #define __END_HIDDEN_DECLS \
84 __END_EXTERN_C _Pragma("GCC visibility pop")
88 #define __BEGIN_DECLS __BEGIN_EXTERN_C
89 #define __END_DECLS __END_EXTERN_C
90 #define __BEGIN_HIDDEN_DECLS \
92 #define __END_HIDDEN_DECLS \
97 * The __VM_CACHELINE_SIZE macro defines the common cache line alignment
98 * size that can be found across most recent and somewhat latest Intel
99 * hardware, i.e. L1 cache sizes etc.
101 * If needed, this value can be TUNED. Suitable values for this macro
102 * are 32, 64 and 128 bytes. The unit of measurement for this macro is
105 * XXX: This macro and related macros will eventually move to a MD
106 * header, but currently, we do need such a hierarchy.
108 #define __VM_CACHELINE_SIZE 64
109 #define __VM_CACHELINE_MASK (__VM_CACHELINE_SIZE - 1)
110 #define __VM_CACHELINE_ALIGN(n) \
111 (((n) + __VM_CACHELINE_MASK) & ~__VM_CACHELINE_MASK)
114 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
115 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
116 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
117 * mode -- there must be no spaces between its arguments, and for nested
118 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
119 * concatenate double-quoted strings produced by the __STRING macro, but
120 * this only works with ANSI C.
122 * __XSTRING is like __STRING, but it expands any macros in its argument
123 * first. It is only available with ANSI C.
125 #if defined(__STDC__) || defined(__cplusplus)
126 #define __P(protos) protos /* full-blown ANSI C */
127 #define __CONCAT1(x,y) x ## y
128 #define __CONCAT(x,y) __CONCAT1(x,y)
129 #define __STRING(x) #x /* stringify without expanding x */
130 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
132 #define __const const /* define reserved names to standard */
133 #define __signed signed
134 #define __volatile volatile
135 #if defined(__cplusplus)
136 #define __inline inline /* convert to C++ keyword */
139 #define __inline /* delete GCC keyword */
140 #endif /* !__GNUC__ */
141 #endif /* !__cplusplus */
143 #else /* !(__STDC__ || __cplusplus) */
144 #define __P(protos) () /* traditional C preprocessor */
145 #define __CONCAT(x,y) x/**/y
146 #define __STRING(x) "x"
149 #define __const /* delete pseudo-ANSI C keywords */
154 * In non-ANSI C environments, new programs will want ANSI-only C keywords
155 * deleted from the program and old programs will want them left alone.
156 * When using a compiler other than gcc, programs using the ANSI C keywords
157 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
158 * When using "gcc -traditional", we assume that this is the intent; if
159 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
161 #ifndef NO_ANSI_KEYWORDS
162 #define const /* delete ANSI C keywords */
166 #endif /* !NO_ANSI_KEYWORDS */
167 #endif /* !__GNUC__ */
168 #endif /* !(__STDC__ || __cplusplus) */
171 * Compiler-dependent macros to help declare dead (non-returning) and
172 * pure (no side effects) functions, and unused variables. They are
173 * null except for versions of gcc that are known to support the features
174 * properly (old versions of gcc-2 supported the dead and pure features
175 * in a different (wrong) way).
177 #define __weak_symbol __attribute__((__weak__))
178 #if __GNUC_PREREQ__(2, 7)
179 #define __dead2 __attribute__((__noreturn__))
180 #define __pure2 __attribute__((__const__))
181 #define __unused __attribute__((__unused__))
182 #define __packed __attribute__((__packed__))
183 #define __aligned(x) __attribute__((__aligned__(x)))
184 #define __section(x) __attribute__((__section__(x)))
191 #if __GNUC_PREREQ__(2, 96)
192 #define __malloclike __attribute__((__malloc__))
193 #define __pure __attribute__((__pure__))
196 #define __pure __pure2
199 #if __GNUC_PREREQ__(3, 1)
200 #define __always_inline __attribute__((__always_inline__))
201 #define __noinline __attribute__((__noinline__))
203 #define __always_inline
207 #if __GNUC_PREREQ__(3, 3)
208 #define __nonnull(...) __attribute__((__nonnull__(__VA_ARGS__)))
209 #define __used __attribute__((__used__))
211 #define __nonnull(...)
212 #define __used __unused
215 #if __GNUC_PREREQ__(3, 4)
216 #define __heedresult __attribute__((__warn_unused_result__))
221 #if __GNUC_PREREQ__(4, 1)
222 #define __returns_twice __attribute__((__returns_twice__))
224 #define __returns_twice
227 #if __GNUC_PREREQ__(4, 6) || __has_builtin(__builtin_unreachable)
228 #define __unreachable() __builtin_unreachable()
230 #define __unreachable() ((void)0)
233 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
234 #define __alloc_size(x) __attribute__((__alloc_size__(x)))
235 #define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x)))
237 #define __alloc_size(x)
238 #define __alloc_size2(n, x)
241 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__)
242 #define __alloc_align(x) __attribute__((__alloc_align__(x)))
244 #define __alloc_align(x)
247 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION__ < 199901
248 #define __func__ NULL
251 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI__)) || \
252 __STDC_VERSION__ >= 199901
253 #define __LONG_LONG_SUPPORTED
256 /* C++11 exposes a load of C99 stuff */
257 #if defined(__cplusplus) && __cplusplus >= 201103L
258 #define __LONG_LONG_SUPPORTED
259 #ifndef __STDC_LIMIT_MACROS
260 #define __STDC_LIMIT_MACROS
262 #ifndef __STDC_CONSTANT_MACROS
263 #define __STDC_CONSTANT_MACROS
268 * GCC 2.95 and later provides `__restrict' as an extension to C90 to support
269 * the C99-specific `restrict' type qualifier. We happen to use `__restrict'
270 * as a way to define the `restrict' type qualifier without disturbing older
271 * software that is unaware of C99 keywords.
273 #if !__GNUC_PREREQ__(2, 95)
274 #if __STDC_VERSION__ < 199901
277 #define __restrict restrict
282 * C99 allows to declare arrays as non-overlapping.
284 #if __GNUC_PREREQ__(3, 1) && !defined(__GNUG__)
285 #define __restrict_arr __restrict
288 #define __restrict_arr
290 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901
291 #define __restrict_arr restrict
293 #define __restrict_arr
299 * GNU C version 2.96 adds explicit branch prediction so that
300 * the CPU back-end can hint the processor and also so that
301 * code blocks can be reordered such that the predicted path
302 * sees a more linear flow, thus improving cache behavior, etc.
304 * The following two macros provide us with a way to utilize this
305 * compiler feature. Use __predict_true() if you expect the expression
306 * to evaluate to true, and __predict_false() if you expect the
307 * expression to evaluate to false.
309 * A few notes about usage:
311 * * Generally, __predict_false() error condition checks (unless
312 * you have some _strong_ reason to do otherwise, in which case
313 * document it), and/or __predict_true() `no-error' condition
314 * checks, assuming you want to optimize for the no-error case.
316 * * Other than that, if you don't know the likelihood of a test
317 * succeeding from empirical or other `hard' evidence, don't
320 * * These are meant to be used in places that are run `a lot'.
321 * It is wasteful to make predictions in code that is run
322 * seldomly (e.g. at subsystem initialization time) as the
323 * basic block reordering that this affects can often generate
326 #if __GNUC_PREREQ__(2, 96)
327 #define __predict_true(exp) __builtin_expect((exp), 1)
328 #define __predict_false(exp) __builtin_expect((exp), 0)
330 #define __predict_true(exp) (exp)
331 #define __predict_false(exp) (exp)
335 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
338 #if __GNUC_PREREQ__(4, 1)
339 #define __offsetof(type, field) __builtin_offsetof(type, field)
342 #define __offsetof(type, field) \
343 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
345 #define __offsetof(type, field) \
346 (__offsetof__ (reinterpret_cast <__size_t> \
347 (&reinterpret_cast <const volatile char &> \
348 (static_cast<type *> (0)->field))))
353 * Compiler-dependent macros to declare that functions take printf-like
354 * or scanf-like arguments. They are null except for versions of gcc
355 * that are known to support the features properly (old versions of gcc-2
356 * didn't permit keeping the keywords out of the application namespace).
358 * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions.
360 #if !__GNUC_PREREQ__(2, 7)
361 #define __printflike(fmtarg, firstvararg)
362 #define __scanflike(fmtarg, firstvararg)
363 #define __printf0like(fmtarg, firstvararg)
364 #define __format_arg(fmtarg)
365 #define __strfmonlike(fmtarg, firstvararg)
366 #define __strftimelike(fmtarg, firstvararg)
368 #elif __GNUC_PREREQ__(3, 0)
369 #define __printflike(fmtarg, firstvararg) \
370 __attribute__((__nonnull__(fmtarg), \
371 __format__ (__printf__, fmtarg, firstvararg)))
372 #define __printf0like(fmtarg, firstvararg) \
373 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
374 #define __scanflike(fmtarg, firstvararg) \
375 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
376 #define __format_arg(fmtarg) \
377 __attribute__((__format_arg__ (fmtarg)))
378 #define __strfmonlike(fmtarg, firstvararg) \
379 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
380 #define __strftimelike(fmtarg, firstvararg) \
381 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
384 #define __printflike(fmtarg, firstvararg) \
385 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
386 #define __printf0like(fmtarg, firstvararg) \
387 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
388 #define __scanflike(fmtarg, firstvararg) \
389 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
390 #define __format_arg(fmtarg) \
391 __attribute__((__format_arg__ (fmtarg)))
392 #define __strfmonlike(fmtarg, firstvararg) \
393 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
394 #define __strftimelike(fmtarg, firstvararg) \
395 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
398 #if !__GNUC_PREREQ__(3, 0)
399 #define __ARRAY_ZERO 0
405 * A convenient constructor macro, GCC 4.3.0 added priority support to
406 * constructors, provide a compatible interface for both.
408 #if __GNUC_PREREQ__(4, 3)
409 #define __constructor(prio) __attribute__((constructor(prio)))
411 #define __constructor(prio) __attribute__((constructor))
415 * Handy GCC based macros:
419 * The __cachealign macro can be used for cache line aligning structures
420 * of small to medium size. It aligns the particular structure or
421 * storage type to a system default cache line alignment, thus giving us
422 * a much more better cache utilization by making the hardware work at
423 * its best burst speeds.
427 * The __usereg macro can/should be used when a function contains
428 * arguments not more than 3. It can be very useful to us due to the
429 * message-passing nature of the kernel.
431 * !!NOTE - USAGE INFORMATION!!
433 * The __cachealign macro should not be used for data structures that are
434 * as big struct proc, struct vnode, struct thread, and other structs which
435 * are as big as them; simply because it will be useless in that case.
437 * The __usereg macro should be used whenever possible, i.e., when a function
438 * does not exceed more than 3 arguments, and should not be used for vararg
441 * In other words, AVOID MISUSE OF THESE MACROS. :-)
444 #define __cachealign __attribute__((__aligned__(__VM_CACHELINE_SIZE)))
445 #define __usereg __attribute__((__regparm__(3)))
452 #define __strong_reference(sym,aliassym) \
453 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
454 #define __weak_reference(sym,aliassym) \
455 __strong_reference(sym,aliassym) __attribute__ ((__weak__))
456 #define __weak_reference_asm(sym,alias) \
457 __asm__(".weak " #alias); \
458 __asm__(".equ " #alias ", " #sym)
459 #define __warn_references(sym,msg) \
460 __asm__(".section .gnu.warning." #sym); \
461 __asm__(".asciz \"" msg "\""); \
463 #define __sym_compat(sym,impl,verid) \
464 __asm__(".symver " #impl ", " #sym "@" #verid)
465 #define __sym_default(sym,impl,verid) \
466 __asm__(".symver " #impl ", " #sym "@@@" #verid)
467 #endif /* __GNUC__ */
469 #if defined(__GNUC__)
470 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
474 #define __RCSID(s) struct __hack
477 #ifndef __RCSID_SOURCE
478 #define __RCSID_SOURCE(s) struct __hack
482 #define __SCCSID(s) struct __hack
486 #define __FBSDID(s) struct __hack
490 #define __COPYRIGHT(s) struct __hack
494 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
498 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
502 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
506 * Keywords added in C11.
509 #if !__GNUC_PREREQ__(2, 95)
510 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
513 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
515 #if !__has_extension(c_alignas)
516 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
517 __has_extension(cxx_alignas)
518 #define _Alignas(x) alignas(x)
520 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
521 #define _Alignas(x) __aligned(x)
525 #if defined(__cplusplus) && __cplusplus >= 201103L
526 #define _Alignof(x) alignof(x)
528 #define _Alignof(x) __alignof(x)
531 #if !defined(_Noreturn)
532 #define _Noreturn __dead2
535 #if !__has_extension(c_static_assert)
536 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
537 __has_extension(cxx_static_assert)
538 #define _Static_assert(x, y) static_assert(x, y)
539 #elif !__GNUC_PREREQ__(4, 6)
540 #define _Static_assert(x, y) struct __hack
542 #define CTASSERT(x) _CTASSERT(x, __LINE__)
543 #define _CTASSERT(x, y) __CTASSERT(x, y)
544 #define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
549 * GCC 4.7 has -std=c++11 but does not support thread_local.
551 #if !__has_extension(c_thread_local)
552 #if (defined(__cplusplus) && __cplusplus >= 201103L && __GNUC_PREREQ__(4, 8)) || \
553 __has_extension(cxx_thread_local)
554 #define _Thread_local thread_local
556 #define _Thread_local __thread
561 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
563 #if defined(_KERNEL) && !defined(CTASSERT)
564 #define CTASSERT(x) _Static_assert(x, \
565 "compile-time assertion failed")
569 * Emulation of C11 _Generic(). Unlike the previously defined C11
570 * keywords, it is not possible to implement this using exactly the same
571 * syntax. Therefore implement something similar under the name
572 * __generic(). Unlike _Generic(), this macro can only distinguish
573 * between a single type, so it requires nested invocations to
574 * distinguish multiple cases.
577 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
578 #define __generic(expr, t, yes, no) \
579 _Generic(expr, t: yes, default: no)
580 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
581 #define __generic(expr, t, yes, no) \
582 __builtin_choose_expr( \
583 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
587 * POSIX.1 requires that the macros we test be defined before any standard
588 * header file is included.
590 * Here's a quick run-down of the versions:
591 * defined(_POSIX_SOURCE) 1003.1-1988
592 * _POSIX_C_SOURCE == 1 1003.1-1990
593 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
594 * _POSIX_C_SOURCE == 199309 1003.1b-1993
595 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
596 * and the omnibus ISO/IEC 9945-1: 1996
597 * _POSIX_C_SOURCE == 200112 1003.1-2001
598 * _POSIX_C_SOURCE == 200809 1003.1-2008
600 * In addition, the X/Open Portability Guide, which is now the Single UNIX
601 * Specification, defines a feature-test macro which indicates the version of
602 * that specification, and which subsumes _POSIX_C_SOURCE.
604 * Our macros begin with two underscores to avoid namespace screwage.
607 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
608 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1
609 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
610 #define _POSIX_C_SOURCE 199009
613 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
614 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2
615 #undef _POSIX_C_SOURCE
616 #define _POSIX_C_SOURCE 199209
619 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
621 #if _XOPEN_SOURCE - 0 >= 700
622 #define __XSI_VISIBLE 700
623 #undef _POSIX_C_SOURCE
624 #define _POSIX_C_SOURCE 200809
625 #elif _XOPEN_SOURCE - 0 >= 600
626 #define __XSI_VISIBLE 600
627 #undef _POSIX_C_SOURCE
628 #define _POSIX_C_SOURCE 200112
629 #elif _XOPEN_SOURCE - 0 >= 500
630 #define __XSI_VISIBLE 500
631 #undef _POSIX_C_SOURCE
632 #define _POSIX_C_SOURCE 199506
637 * Deal with all versions of POSIX. The ordering relative to the tests above is
640 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
641 #define _POSIX_C_SOURCE 198808
643 #ifdef _POSIX_C_SOURCE
644 #if (_POSIX_C_SOURCE - 0) >= 200809
645 #define __POSIX_VISIBLE 200809
646 #define __ISO_C_VISIBLE 1999
647 #elif (_POSIX_C_SOURCE - 0) >= 200112
648 #define __POSIX_VISIBLE 200112
649 #define __ISO_C_VISIBLE 1999
650 #elif (_POSIX_C_SOURCE - 0) >= 199506
651 #define __POSIX_VISIBLE 199506
652 #define __ISO_C_VISIBLE 1990
653 #elif (_POSIX_C_SOURCE - 0) >= 199309
654 #define __POSIX_VISIBLE 199309
655 #define __ISO_C_VISIBLE 1990
656 #elif (_POSIX_C_SOURCE - 0) >= 199209
657 #define __POSIX_VISIBLE 199209
658 #define __ISO_C_VISIBLE 1990
659 #elif (_POSIX_C_SOURCE - 0) >= 199009
660 #define __POSIX_VISIBLE 199009
661 #define __ISO_C_VISIBLE 1990
663 #define __POSIX_VISIBLE 198808
664 #define __ISO_C_VISIBLE 0
665 #endif /* _POSIX_C_SOURCE */
668 * Deal with _ANSI_SOURCE:
669 * If it is defined, and no other compilation environment is explicitly
670 * requested, then define our internal feature-test macros to zero. This
671 * makes no difference to the preprocessor (undefined symbols in preprocessing
672 * expressions are defined to have value zero), but makes it more convenient for
673 * a test program to print out the values.
675 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
676 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
677 * environment (and in fact we will never get here).
679 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
680 #define __POSIX_VISIBLE 0
681 #define __XSI_VISIBLE 0
682 #define __BSD_VISIBLE 0
683 #define __ISO_C_VISIBLE 1990
684 #define __EXT1_VISIBLE 0
685 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
686 #define __POSIX_VISIBLE 0
687 #define __XSI_VISIBLE 0
688 #define __BSD_VISIBLE 0
689 #define __ISO_C_VISIBLE 1999
690 #define __EXT1_VISIBLE 0
691 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
692 #define __POSIX_VISIBLE 0
693 #define __XSI_VISIBLE 0
694 #define __BSD_VISIBLE 0
695 #define __ISO_C_VISIBLE 2011
696 #define __EXT1_VISIBLE 0
697 #else /* Default environment: show everything. */
698 #define __POSIX_VISIBLE 200809
699 #define __XSI_VISIBLE 700
700 #define __BSD_VISIBLE 1
701 #define __ISO_C_VISIBLE 2011
702 #define __EXT1_VISIBLE 1
706 /* User override __EXT1_VISIBLE */
707 #if defined(__STDC_WANT_LIB_EXT1__)
708 #undef __EXT1_VISIBLE
709 #if __STDC_WANT_LIB_EXT1__
710 #define __EXT1_VISIBLE 1
712 #define __EXT1_VISIBLE 0
714 #endif /* __STDC_WANT_LIB_EXT1__ */
716 #ifndef __BSD_VISIBLE
717 #define __BSD_VISIBLE 0
719 #ifndef __EXT1_VISIBLE
720 #define __EXT1_VISIBLE 0
724 * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections
725 * of kernel modules which are discarded from binutils 2.17.50+ otherwise.
728 #define __GLOBL1(sym) __asm__(".globl " #sym)
729 #define __GLOBL(sym) __GLOBL1(sym)
731 #endif /* !_SYS_CDEFS_H_ */