1/* Copyright (C) 1992-2022 Free Software Foundation, Inc. 
2 Copyright The GNU Toolchain Authors. 
3 This file is part of the GNU C Library. 
4 
5 The GNU C Library is free software; you can redistribute it and/or 
6 modify it under the terms of the GNU Lesser General Public 
7 License as published by the Free Software Foundation; either 
8 version 2.1 of the License, or (at your option) any later version. 
9 
10 The GNU C Library is distributed in the hope that it will be useful, 
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
13 Lesser General Public License for more details. 
14 
15 You should have received a copy of the GNU Lesser General Public 
16 License along with the GNU C Library; if not, see 
17 <https://www.gnu.org/licenses/>. */ 
18 
19#ifndef _SYS_CDEFS_H 
20#define _SYS_CDEFS_H 1 
21 
22/* We are almost always included from features.h. */ 
23#ifndef _FEATURES_H 
24# include <features.h> 
25#endif 
26 
27/* The GNU libc does not support any K&R compilers or the traditional mode 
28 of ISO C compilers anymore. Check for some of the combinations not 
29 supported anymore. */ 
30#if defined __GNUC__ && !defined __STDC__ 
31# error "You need a ISO C conforming compiler to use the glibc headers" 
32#endif 
33 
34/* Some user header file might have defined this before. */ 
35#undef __P 
36#undef __PMT 
37 
38/* Compilers that lack __has_attribute may object to 
39 #if defined __has_attribute && __has_attribute (...) 
40 even though they do not need to evaluate the right-hand side of the &&. 
41 Similarly for __has_builtin, etc. */ 
42#if (defined __has_attribute \ 
43 && (!defined __clang_minor__ \ 
44 || 3 < __clang_major__ + (5 <= __clang_minor__))) 
45# define __glibc_has_attribute(attr) __has_attribute (attr) 
46#else 
47# define __glibc_has_attribute(attr) 0 
48#endif 
49#ifdef __has_builtin 
50# define __glibc_has_builtin(name) __has_builtin (name) 
51#else 
52# define __glibc_has_builtin(name) 0 
53#endif 
54#ifdef __has_extension 
55# define __glibc_has_extension(ext) __has_extension (ext) 
56#else 
57# define __glibc_has_extension(ext) 0 
58#endif 
59 
60#if defined __GNUC__ || defined __clang__ 
61 
62/* All functions, except those with callbacks or those that 
63 synchronize memory, are leaf functions. */ 
64# if __GNUC_PREREQ (4, 6) && !defined _LIBC 
65# define __LEAF , __leaf__ 
66# define __LEAF_ATTR __attribute__ ((__leaf__)) 
67# else 
68# define __LEAF 
69# define __LEAF_ATTR 
70# endif 
71 
72/* GCC can always grok prototypes. For C++ programs we add throw() 
73 to help it optimize the function calls. But this only works with 
74 gcc 2.8.x and egcs. For gcc 3.4 and up we even mark C functions 
75 as non-throwing using a function attribute since programs can use 
76 the -fexceptions options for C code as well. */ 
77# if !defined __cplusplus \ 
78 && (__GNUC_PREREQ (3, 4) || __glibc_has_attribute (__nothrow__)) 
79# define __THROW __attribute__ ((__nothrow__ __LEAF)) 
80# define __THROWNL __attribute__ ((__nothrow__)) 
81# define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) fct 
82# define __NTHNL(fct) __attribute__ ((__nothrow__)) fct 
83# else 
84# if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major >= 4) 
85# if __cplusplus >= 201103L 
86# define __THROW noexcept (true) 
87# else 
88# define __THROW throw () 
89# endif 
90# define __THROWNL __THROW 
91# define __NTH(fct) __LEAF_ATTR fct __THROW 
92# define __NTHNL(fct) fct __THROW 
93# else 
94# define __THROW 
95# define __THROWNL 
96# define __NTH(fct) fct 
97# define __NTHNL(fct) fct 
98# endif 
99# endif 
100 
101#else /* Not GCC or clang. */ 
102 
103# if (defined __cplusplus \ 
104 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) 
105# define __inline inline 
106# else 
107# define __inline /* No inline functions. */ 
108# endif 
109 
110# define __THROW 
111# define __THROWNL 
112# define __NTH(fct) fct 
113 
114#endif /* GCC || clang. */ 
115 
116/* These two macros are not used in glibc anymore. They are kept here 
117 only because some other projects expect the macros to be defined. */ 
118#define __P(args) args 
119#define __PMT(args) args 
120 
121/* For these things, GCC behaves the ANSI way normally, 
122 and the non-ANSI way under -traditional. */ 
123 
124#define __CONCAT(x,y) x ## y 
125#define __STRING(x) #x 
126 
127/* This is not a typedef so `const __ptr_t' does the right thing. */ 
128#define __ptr_t void * 
129 
130 
131/* C++ needs to know that types and declarations are C, not C++. */ 
132#ifdef __cplusplus 
133# define __BEGIN_DECLS extern "C" { 
134# define __END_DECLS } 
135#else 
136# define __BEGIN_DECLS 
137# define __END_DECLS 
138#endif 
139 
140 
141/* Fortify support. */ 
142#define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1) 
143#define __bos0(ptr) __builtin_object_size (ptr, 0) 
144 
145/* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available. */ 
146#if __USE_FORTIFY_LEVEL == 3 && (__glibc_clang_prereq (9, 0) \ 
147 || __GNUC_PREREQ (12, 0)) 
148# define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0) 
149# define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1) 
150#else 
151# define __glibc_objsize0(__o) __bos0 (__o) 
152# define __glibc_objsize(__o) __bos (__o) 
153#endif 
154 
155/* Compile time conditions to choose between the regular, _chk and _chk_warn 
156 variants. These conditions should get evaluated to constant and optimized 
157 away. */ 
158 
159#define __glibc_safe_len_cond(__l, __s, __osz) ((__l) <= (__osz) / (__s)) 
160#define __glibc_unsigned_or_positive(__l) \ 
161 ((__typeof (__l)) 0 < (__typeof (__l)) -1 \ 
162 || (__builtin_constant_p (__l) && (__l) > 0)) 
163 
164/* Length is known to be safe at compile time if the __L * __S <= __OBJSZ 
165 condition can be folded to a constant and if it is true. The -1 check is 
166 redundant because since it implies that __glibc_safe_len_cond is true. */ 
167#define __glibc_safe_or_unknown_len(__l, __s, __osz) \ 
168 (__glibc_unsigned_or_positive (__l) \ 
169 && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \ 
170 __s, __osz)) \ 
171 && __glibc_safe_len_cond ((__SIZE_TYPE__) (__l), __s, __osz)) 
172 
173/* Conversely, we know at compile time that the length is unsafe if the 
174 __L * __S <= __OBJSZ condition can be folded to a constant and if it is 
175 false. */ 
176#define __glibc_unsafe_len(__l, __s, __osz) \ 
177 (__glibc_unsigned_or_positive (__l) \ 
178 && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \ 
179 __s, __osz)) \ 
180 && !__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), __s, __osz)) 
181 
182/* Fortify function f. __f_alias, __f_chk and __f_chk_warn must be 
183 declared. */ 
184 
185#define __glibc_fortify(f, __l, __s, __osz, ...) \ 
186 (__glibc_safe_or_unknown_len (__l, __s, __osz) \ 
187 ? __ ## f ## _alias (__VA_ARGS__) \ 
188 : (__glibc_unsafe_len (__l, __s, __osz) \ 
189 ? __ ## f ## _chk_warn (__VA_ARGS__, __osz) \ 
190 : __ ## f ## _chk (__VA_ARGS__, __osz))) \ 
191 
192/* Fortify function f, where object size argument passed to f is the number of 
193 elements and not total size. */ 
194 
195#define __glibc_fortify_n(f, __l, __s, __osz, ...) \ 
196 (__glibc_safe_or_unknown_len (__l, __s, __osz) \ 
197 ? __ ## f ## _alias (__VA_ARGS__) \ 
198 : (__glibc_unsafe_len (__l, __s, __osz) \ 
199 ? __ ## f ## _chk_warn (__VA_ARGS__, (__osz) / (__s)) \ 
200 : __ ## f ## _chk (__VA_ARGS__, (__osz) / (__s)))) \ 
201 
202#if __GNUC_PREREQ (4,3) 
203# define __warnattr(msg) __attribute__((__warning__ (msg))) 
204# define __errordecl(name, msg) \ 
205 extern void name (void) __attribute__((__error__ (msg))) 
206#else 
207# define __warnattr(msg) 
208# define __errordecl(name, msg) extern void name (void) 
209#endif 
210 
211/* Support for flexible arrays. 
212 Headers that should use flexible arrays only if they're "real" 
213 (e.g. only if they won't affect sizeof()) should test 
214 #if __glibc_c99_flexarr_available. */ 
215#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc 
216# define __flexarr [] 
217# define __glibc_c99_flexarr_available 1 
218#elif __GNUC_PREREQ (2,97) || defined __clang__ 
219/* GCC 2.97 and clang support C99 flexible array members as an extension, 
220 even when in C89 mode or compiling C++ (any version). */ 
221# define __flexarr [] 
222# define __glibc_c99_flexarr_available 1 
223#elif defined __GNUC__ 
224/* Pre-2.97 GCC did not support C99 flexible arrays but did have 
225 an equivalent extension with slightly different notation. */ 
226# define __flexarr [0] 
227# define __glibc_c99_flexarr_available 1 
228#else 
229/* Some other non-C99 compiler. Approximate with [1]. */ 
230# define __flexarr [1] 
231# define __glibc_c99_flexarr_available 0 
232#endif 
233 
234 
235/* __asm__ ("xyz") is used throughout the headers to rename functions 
236 at the assembly language level. This is wrapped by the __REDIRECT 
237 macro, in order to support compilers that can do this some other 
238 way. When compilers don't support asm-names at all, we have to do 
239 preprocessor tricks instead (which don't have exactly the right 
240 semantics, but it's the best we can do). 
241 
242 Example: 
243 int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ 
244 
245#if (defined __GNUC__ && __GNUC__ >= 2) || (__clang_major__ >= 4) 
246 
247# define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) 
248# ifdef __cplusplus 
249# define __REDIRECT_NTH(name, proto, alias) \ 
250 name proto __THROW __asm__ (__ASMNAME (#alias)) 
251# define __REDIRECT_NTHNL(name, proto, alias) \ 
252 name proto __THROWNL __asm__ (__ASMNAME (#alias)) 
253# else 
254# define __REDIRECT_NTH(name, proto, alias) \ 
255 name proto __asm__ (__ASMNAME (#alias)) __THROW 
256# define __REDIRECT_NTHNL(name, proto, alias) \ 
257 name proto __asm__ (__ASMNAME (#alias)) __THROWNL 
258# endif 
259# define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) 
260# define __ASMNAME2(prefix, cname) __STRING (prefix) cname 
261 
262/* 
263#elif __SOME_OTHER_COMPILER__ 
264 
265# define __REDIRECT(name, proto, alias) name proto; \ 
266 _Pragma("let " #name " = " #alias) 
267*/ 
268#endif 
269 
270/* GCC and clang have various useful declarations that can be made with 
271 the '__attribute__' syntax. All of the ways we use this do fine if 
272 they are omitted for compilers that don't understand it. */ 
273#if !(defined __GNUC__ || defined __clang__) 
274# define __attribute__(xyz) /* Ignore */ 
275#endif 
276 
277/* At some point during the gcc 2.96 development the `malloc' attribute 
278 for functions was introduced. We don't want to use it unconditionally 
279 (although this would be possible) since it generates warnings. */ 
280#if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__malloc__) 
281# define __attribute_malloc__ __attribute__ ((__malloc__)) 
282#else 
283# define __attribute_malloc__ /* Ignore */ 
284#endif 
285 
286/* Tell the compiler which arguments to an allocation function 
287 indicate the size of the allocation. */ 
288#if __GNUC_PREREQ (4, 3) 
289# define __attribute_alloc_size__(params) \ 
290 __attribute__ ((__alloc_size__ params)) 
291#else 
292# define __attribute_alloc_size__(params) /* Ignore. */ 
293#endif 
294 
295/* Tell the compiler which argument to an allocation function 
296 indicates the alignment of the allocation. */ 
297#if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__alloc_align__) 
298# define __attribute_alloc_align__(param) \ 
299 __attribute__ ((__alloc_align__ param)) 
300#else 
301# define __attribute_alloc_align__(param) /* Ignore. */ 
302#endif 
303 
304/* At some point during the gcc 2.96 development the `pure' attribute 
305 for functions was introduced. We don't want to use it unconditionally 
306 (although this would be possible) since it generates warnings. */ 
307#if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__pure__) 
308# define __attribute_pure__ __attribute__ ((__pure__)) 
309#else 
310# define __attribute_pure__ /* Ignore */ 
311#endif 
312 
313/* This declaration tells the compiler that the value is constant. */ 
314#if __GNUC_PREREQ (2,5) || __glibc_has_attribute (__const__) 
315# define __attribute_const__ __attribute__ ((__const__)) 
316#else 
317# define __attribute_const__ /* Ignore */ 
318#endif 
319 
320#if __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__) 
321# define __attribute_maybe_unused__ __attribute__ ((__unused__)) 
322#else 
323# define __attribute_maybe_unused__ /* Ignore */ 
324#endif 
325 
326/* At some point during the gcc 3.1 development the `used' attribute 
327 for functions was introduced. We don't want to use it unconditionally 
328 (although this would be possible) since it generates warnings. */ 
329#if __GNUC_PREREQ (3,1) || __glibc_has_attribute (__used__) 
330# define __attribute_used__ __attribute__ ((__used__)) 
331# define __attribute_noinline__ __attribute__ ((__noinline__)) 
332#else 
333# define __attribute_used__ __attribute__ ((__unused__)) 
334# define __attribute_noinline__ /* Ignore */ 
335#endif 
336 
337/* Since version 3.2, gcc allows marking deprecated functions. */ 
338#if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__deprecated__) 
339# define __attribute_deprecated__ __attribute__ ((__deprecated__)) 
340#else 
341# define __attribute_deprecated__ /* Ignore */ 
342#endif 
343 
344/* Since version 4.5, gcc also allows one to specify the message printed 
345 when a deprecated function is used. clang claims to be gcc 4.2, but 
346 may also support this feature. */ 
347#if __GNUC_PREREQ (4,5) \ 
348 || __glibc_has_extension (__attribute_deprecated_with_message__) 
349# define __attribute_deprecated_msg__(msg) \ 
350 __attribute__ ((__deprecated__ (msg))) 
351#else 
352# define __attribute_deprecated_msg__(msg) __attribute_deprecated__ 
353#endif 
354 
355/* At some point during the gcc 2.8 development the `format_arg' attribute 
356 for functions was introduced. We don't want to use it unconditionally 
357 (although this would be possible) since it generates warnings. 
358 If several `format_arg' attributes are given for the same function, in 
359 gcc-3.0 and older, all but the last one are ignored. In newer gccs, 
360 all designated arguments are considered. */ 
361#if __GNUC_PREREQ (2,8) || __glibc_has_attribute (__format_arg__) 
362# define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) 
363#else 
364# define __attribute_format_arg__(x) /* Ignore */ 
365#endif 
366 
367/* At some point during the gcc 2.97 development the `strfmon' format 
368 attribute for functions was introduced. We don't want to use it 
369 unconditionally (although this would be possible) since it 
370 generates warnings. */ 
371#if __GNUC_PREREQ (2,97) || __glibc_has_attribute (__format__) 
372# define __attribute_format_strfmon__(a,b) \ 
373 __attribute__ ((__format__ (__strfmon__, a, b))) 
374#else 
375# define __attribute_format_strfmon__(a,b) /* Ignore */ 
376#endif 
377 
378/* The nonnull function attribute marks pointer parameters that 
379 must not be NULL. This has the name __nonnull in glibc, 
380 and __attribute_nonnull__ in files shared with Gnulib to avoid 
381 collision with a different __nonnull in DragonFlyBSD 5.9. */ 
382#ifndef __attribute_nonnull__ 
383# if __GNUC_PREREQ (3,3) || __glibc_has_attribute (__nonnull__) 
384# define __attribute_nonnull__(params) __attribute__ ((__nonnull__ params)) 
385# else 
386# define __attribute_nonnull__(params) 
387# endif 
388#endif 
389#ifndef __nonnull 
390# define __nonnull(params) __attribute_nonnull__ (params) 
391#endif 
392 
393/* The returns_nonnull function attribute marks the return type of the function 
394 as always being non-null. */ 
395#ifndef __returns_nonnull 
396# if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__returns_nonnull__) 
397# define __returns_nonnull __attribute__ ((__returns_nonnull__)) 
398# else 
399# define __returns_nonnull 
400# endif 
401#endif 
402 
403/* If fortification mode, we warn about unused results of certain 
404 function calls which can lead to problems. */ 
405#if __GNUC_PREREQ (3,4) || __glibc_has_attribute (__warn_unused_result__) 
406# define __attribute_warn_unused_result__ \ 
407 __attribute__ ((__warn_unused_result__)) 
408# if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0 
409# define __wur __attribute_warn_unused_result__ 
410# endif 
411#else 
412# define __attribute_warn_unused_result__ /* empty */ 
413#endif 
414#ifndef __wur 
415# define __wur /* Ignore */ 
416#endif 
417 
418/* Forces a function to be always inlined. */ 
419#if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__always_inline__) 
420/* The Linux kernel defines __always_inline in stddef.h (283d7573), and 
421 it conflicts with this definition. Therefore undefine it first to 
422 allow either header to be included first. */ 
423# undef __always_inline 
424# define __always_inline __inline __attribute__ ((__always_inline__)) 
425#else 
426# undef __always_inline 
427# define __always_inline __inline 
428#endif 
429 
430/* Associate error messages with the source location of the call site rather 
431 than with the source location inside the function. */ 
432#if __GNUC_PREREQ (4,3) || __glibc_has_attribute (__artificial__) 
433# define __attribute_artificial__ __attribute__ ((__artificial__)) 
434#else 
435# define __attribute_artificial__ /* Ignore */ 
436#endif 
437 
438/* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99 
439 inline semantics, unless -fgnu89-inline is used. Using __GNUC_STDC_INLINE__ 
440 or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions 
441 older than 4.3 may define these macros and still not guarantee GNU inlining 
442 semantics. 
443 
444 clang++ identifies itself as gcc-4.2, but has support for GNU inlining 
445 semantics, that can be checked for by using the __GNUC_STDC_INLINE_ and 
446 __GNUC_GNU_INLINE__ macro definitions. */ 
447#if (!defined __cplusplus || __GNUC_PREREQ (4,3) \ 
448 || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \ 
449 || defined __GNUC_GNU_INLINE__))) 
450# if defined __GNUC_STDC_INLINE__ || defined __cplusplus 
451# define __extern_inline extern __inline __attribute__ ((__gnu_inline__)) 
452# define __extern_always_inline \ 
453 extern __always_inline __attribute__ ((__gnu_inline__)) 
454# else 
455# define __extern_inline extern __inline 
456# define __extern_always_inline extern __always_inline 
457# endif 
458#endif 
459 
460#ifdef __extern_always_inline 
461# define __fortify_function __extern_always_inline __attribute_artificial__ 
462#endif 
463 
464/* GCC 4.3 and above allow passing all anonymous arguments of an 
465 __extern_always_inline function to some other vararg function. */ 
466#if __GNUC_PREREQ (4,3) 
467# define __va_arg_pack() __builtin_va_arg_pack () 
468# define __va_arg_pack_len() __builtin_va_arg_pack_len () 
469#endif 
470 
471/* It is possible to compile containing GCC extensions even if GCC is 
472 run in pedantic mode if the uses are carefully marked using the 
473 `__extension__' keyword. But this is not generally available before 
474 version 2.8. */ 
475#if !(__GNUC_PREREQ (2,8) || defined __clang__) 
476# define __extension__ /* Ignore */ 
477#endif 
478 
479/* __restrict is known in EGCS 1.2 and above, and in clang. 
480 It works also in C++ mode (outside of arrays), but only when spelled 
481 as '__restrict', not 'restrict'. */ 
482#if !(__GNUC_PREREQ (2,92) || __clang_major__ >= 3) 
483# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 
484# define __restrict restrict 
485# else 
486# define __restrict /* Ignore */ 
487# endif 
488#endif 
489 
490/* ISO C99 also allows to declare arrays as non-overlapping. The syntax is 
491 array_name[restrict] 
492 GCC 3.1 and clang support this. 
493 This syntax is not usable in C++ mode. */ 
494#if (__GNUC_PREREQ (3,1) || __clang_major__ >= 3) && !defined __cplusplus 
495# define __restrict_arr __restrict 
496#else 
497# ifdef __GNUC__ 
498# define __restrict_arr /* Not supported in old GCC. */ 
499# else 
500# if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 
501# define __restrict_arr restrict 
502# else 
503/* Some other non-C99 compiler. */ 
504# define __restrict_arr /* Not supported. */ 
505# endif 
506# endif 
507#endif 
508 
509#if (__GNUC__ >= 3) || __glibc_has_builtin (__builtin_expect) 
510# define __glibc_unlikely(cond) __builtin_expect ((cond), 0) 
511# define __glibc_likely(cond) __builtin_expect ((cond), 1) 
512#else 
513# define __glibc_unlikely(cond) (cond) 
514# define __glibc_likely(cond) (cond) 
515#endif 
516 
517#if (!defined _Noreturn \ 
518 && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ 
519 && !(__GNUC_PREREQ (4,7) \ 
520 || (3 < __clang_major__ + (5 <= __clang_minor__)))) 
521# if __GNUC_PREREQ (2,8) 
522# define _Noreturn __attribute__ ((__noreturn__)) 
523# else 
524# define _Noreturn 
525# endif 
526#endif 
527 
528#if __GNUC_PREREQ (8, 0) 
529/* Describes a char array whose address can safely be passed as the first 
530 argument to strncpy and strncat, as the char array is not necessarily 
531 a NUL-terminated string. */ 
532# define __attribute_nonstring__ __attribute__ ((__nonstring__)) 
533#else 
534# define __attribute_nonstring__ 
535#endif 
536 
537/* Undefine (also defined in libc-symbols.h). */ 
538#undef __attribute_copy__ 
539#if __GNUC_PREREQ (9, 0) 
540/* Copies attributes from the declaration or type referenced by 
541 the argument. */ 
542# define __attribute_copy__(arg) __attribute__ ((__copy__ (arg))) 
543#else 
544# define __attribute_copy__(arg) 
545#endif 
546 
547#if (!defined _Static_assert && !defined __cplusplus \ 
548 && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ 
549 && (!(__GNUC_PREREQ (4, 6) || __clang_major__ >= 4) \ 
550 || defined __STRICT_ANSI__)) 
551# define _Static_assert(expr, diagnostic) \ 
552 extern int (*__Static_assert_function (void)) \ 
553 [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })] 
554#endif 
555 
556/* Gnulib avoids including these, as they don't work on non-glibc or 
557 older glibc platforms. */ 
558#ifndef __GNULIB_CDEFS 
559# include <bits/wordsize.h> 
560# include <bits/long-double.h> 
561#endif 
562 
563#if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 
564# ifdef __REDIRECT 
565 
566/* Alias name defined automatically. */ 
567# define __LDBL_REDIR(name, proto) ... unused__ldbl_redir 
568# define __LDBL_REDIR_DECL(name) \ 
569 extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128")); 
570 
571/* Alias name defined automatically, with leading underscores. */ 
572# define __LDBL_REDIR2_DECL(name) \ 
573 extern __typeof (__##name) __##name \ 
574 __asm (__ASMNAME ("__" #name "ieee128")); 
575 
576/* Alias name defined manually. */ 
577# define __LDBL_REDIR1(name, proto, alias) ... unused__ldbl_redir1 
578# define __LDBL_REDIR1_DECL(name, alias) \ 
579 extern __typeof (name) name __asm (__ASMNAME (#alias)); 
580 
581# define __LDBL_REDIR1_NTH(name, proto, alias) \ 
582 __REDIRECT_NTH (name, proto, alias) 
583# define __REDIRECT_NTH_LDBL(name, proto, alias) \ 
584 __LDBL_REDIR1_NTH (name, proto, __##alias##ieee128) 
585 
586/* Unused. */ 
587# define __REDIRECT_LDBL(name, proto, alias) ... unused__redirect_ldbl 
588# define __LDBL_REDIR_NTH(name, proto) ... unused__ldbl_redir_nth 
589 
590# else 
591_Static_assert (0, "IEEE 128-bits long double requires redirection on this platform"); 
592# endif 
593#elif defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH 
594# define __LDBL_COMPAT 1 
595# ifdef __REDIRECT 
596# define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias) 
597# define __LDBL_REDIR(name, proto) \ 
598 __LDBL_REDIR1 (name, proto, __nldbl_##name) 
599# define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias) 
600# define __LDBL_REDIR_NTH(name, proto) \ 
601 __LDBL_REDIR1_NTH (name, proto, __nldbl_##name) 
602# define __LDBL_REDIR2_DECL(name) \ 
603 extern __typeof (__##name) __##name __asm (__ASMNAME ("__nldbl___" #name)); 
604# define __LDBL_REDIR1_DECL(name, alias) \ 
605 extern __typeof (name) name __asm (__ASMNAME (#alias)); 
606# define __LDBL_REDIR_DECL(name) \ 
607 extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name)); 
608# define __REDIRECT_LDBL(name, proto, alias) \ 
609 __LDBL_REDIR1 (name, proto, __nldbl_##alias) 
610# define __REDIRECT_NTH_LDBL(name, proto, alias) \ 
611 __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias) 
612# endif 
613#endif 
614#if (!defined __LDBL_COMPAT && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0) \ 
615 || !defined __REDIRECT 
616# define __LDBL_REDIR1(name, proto, alias) name proto 
617# define __LDBL_REDIR(name, proto) name proto 
618# define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW 
619# define __LDBL_REDIR_NTH(name, proto) name proto __THROW 
620# define __LDBL_REDIR2_DECL(name) 
621# define __LDBL_REDIR_DECL(name) 
622# ifdef __REDIRECT 
623# define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias) 
624# define __REDIRECT_NTH_LDBL(name, proto, alias) \ 
625 __REDIRECT_NTH (name, proto, alias) 
626# endif 
627#endif 
628 
629/* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is 
630 intended for use in preprocessor macros. 
631 
632 Note: MESSAGE must be a _single_ string; concatenation of string 
633 literals is not supported. */ 
634#if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5) 
635# define __glibc_macro_warning1(message) _Pragma (#message) 
636# define __glibc_macro_warning(message) \ 
637 __glibc_macro_warning1 (GCC warning message) 
638#else 
639# define __glibc_macro_warning(msg) 
640#endif 
641 
642/* Generic selection (ISO C11) is a C-only feature, available in GCC 
643 since version 4.9. Previous versions do not provide generic 
644 selection, even though they might set __STDC_VERSION__ to 201112L, 
645 when in -std=c11 mode. Thus, we must check for !defined __GNUC__ 
646 when testing __STDC_VERSION__ for generic selection support. 
647 On the other hand, Clang also defines __GNUC__, so a clang-specific 
648 check is required to enable the use of generic selection. */ 
649#if !defined __cplusplus \ 
650 && (__GNUC_PREREQ (4, 9) \ 
651 || __glibc_has_extension (c_generic_selections) \ 
652 || (!defined __GNUC__ && defined __STDC_VERSION__ \ 
653 && __STDC_VERSION__ >= 201112L)) 
654# define __HAVE_GENERIC_SELECTION 1 
655#else 
656# define __HAVE_GENERIC_SELECTION 0 
657#endif 
658 
659#if __GNUC_PREREQ (10, 0) 
660/* Designates a 1-based positional argument ref-index of pointer type 
661 that can be used to access size-index elements of the pointed-to 
662 array according to access mode, or at least one element when 
663 size-index is not provided: 
664 access (access-mode, <ref-index> [, <size-index>]) */ 
665# define __attr_access(x) __attribute__ ((__access__ x)) 
666/* For _FORTIFY_SOURCE == 3 we use __builtin_dynamic_object_size, which may 
667 use the access attribute to get object sizes from function definition 
668 arguments, so we can't use them on functions we fortify. Drop the object 
669 size hints for such functions. */ 
670# if __USE_FORTIFY_LEVEL == 3 
671# define __fortified_attr_access(a, o, s) __attribute__ ((__access__ (a, o))) 
672# else 
673# define __fortified_attr_access(a, o, s) __attr_access ((a, o, s)) 
674# endif 
675# if __GNUC_PREREQ (11, 0) 
676# define __attr_access_none(argno) __attribute__ ((__access__ (__none__, argno))) 
677# else 
678# define __attr_access_none(argno) 
679# endif 
680#else 
681# define __fortified_attr_access(a, o, s) 
682# define __attr_access(x) 
683# define __attr_access_none(argno) 
684#endif 
685 
686#if __GNUC_PREREQ (11, 0) 
687/* Designates dealloc as a function to call to deallocate objects 
688 allocated by the declared function. */ 
689# define __attr_dealloc(dealloc, argno) \ 
690 __attribute__ ((__malloc__ (dealloc, argno))) 
691# define __attr_dealloc_free __attr_dealloc (__builtin_free, 1) 
692#else 
693# define __attr_dealloc(dealloc, argno) 
694# define __attr_dealloc_free 
695#endif 
696 
697/* Specify that a function such as setjmp or vfork may return 
698 twice. */ 
699#if __GNUC_PREREQ (4, 1) 
700# define __attribute_returns_twice__ __attribute__ ((__returns_twice__)) 
701#else 
702# define __attribute_returns_twice__ /* Ignore. */ 
703#endif 
704 
705#endif /* sys/cdefs.h */ 
706