1 /* Copyright (C) 1992-2023 Free Software Foundation, Inc.
2 Copyright The GNU Toolchain Authors.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #define _SYS_CDEFS_H 1
22 /* We are almost always included from features.h. */
24 # include <features.h>
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
30 #if defined __GNUC__ && !defined __STDC__ && !defined __cplusplus
31 # error "You need a ISO C or C++ conforming compiler to use the glibc headers"
34 /* Some user header file might have defined this before. */
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)
47 # define __glibc_has_attribute(attr) 0
50 # define __glibc_has_builtin(name) __has_builtin (name)
52 # define __glibc_has_builtin(name) 0
54 #ifdef __has_extension
55 # define __glibc_has_extension(ext) __has_extension (ext)
57 # define __glibc_has_extension(ext) 0
60 #if defined __GNUC__ || defined __clang__
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__))
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
84 # if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major__ >= 4)
85 # if __cplusplus >= 201103L
86 # define __THROW noexcept (true)
88 # define __THROW throw ()
90 # define __THROWNL __THROW
91 # define __NTH(fct) __LEAF_ATTR fct __THROW
92 # define __NTHNL(fct) fct __THROW
96 # define __NTH(fct) fct
97 # define __NTHNL(fct) fct
101 # if __GNUC_PREREQ (4, 3) || __glibc_has_attribute (__cold__)
102 # define __COLD __attribute__ ((__cold__))
107 #else /* Not GCC or clang. */
109 # if (defined __cplusplus \
110 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
111 # define __inline inline
113 # define __inline /* No inline functions. */
118 # define __NTH(fct) fct
121 #endif /* GCC || clang. */
123 /* These two macros are not used in glibc anymore. They are kept here
124 only because some other projects expect the macros to be defined. */
125 #define __P(args) args
126 #define __PMT(args) args
128 /* For these things, GCC behaves the ANSI way normally,
129 and the non-ANSI way under -traditional. */
131 #define __CONCAT(x,y) x ## y
132 #define __STRING(x) #x
134 /* This is not a typedef so `const __ptr_t' does the right thing. */
135 #define __ptr_t void *
138 /* C++ needs to know that types and declarations are C, not C++. */
140 # define __BEGIN_DECLS extern "C" {
141 # define __END_DECLS }
143 # define __BEGIN_DECLS
148 /* Fortify support. */
149 #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
150 #define __bos0(ptr) __builtin_object_size (ptr, 0)
152 /* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available. */
153 #if __USE_FORTIFY_LEVEL == 3 && (__glibc_clang_prereq (9, 0) \
154 || __GNUC_PREREQ (12, 0))
155 # define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0)
156 # define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1)
158 # define __glibc_objsize0(__o) __bos0 (__o)
159 # define __glibc_objsize(__o) __bos (__o)
162 #if __USE_FORTIFY_LEVEL > 0
163 /* Compile time conditions to choose between the regular, _chk and _chk_warn
164 variants. These conditions should get evaluated to constant and optimized
167 #define __glibc_safe_len_cond(__l, __s, __osz) ((__l) <= (__osz) / (__s))
168 #define __glibc_unsigned_or_positive(__l) \
169 ((__typeof (__l)) 0 < (__typeof (__l)) -1 \
170 || (__builtin_constant_p (__l) && (__l) > 0))
172 /* Length is known to be safe at compile time if the __L * __S <= __OBJSZ
173 condition can be folded to a constant and if it is true, or unknown (-1) */
174 #define __glibc_safe_or_unknown_len(__l, __s, __osz) \
175 ((__builtin_constant_p (__osz) && (__osz) == (__SIZE_TYPE__) -1) \
176 || (__glibc_unsigned_or_positive (__l) \
177 && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \
179 && __glibc_safe_len_cond ((__SIZE_TYPE__) (__l), (__s), (__osz))))
181 /* Conversely, we know at compile time that the length is unsafe if the
182 __L * __S <= __OBJSZ condition can be folded to a constant and if it is
184 #define __glibc_unsafe_len(__l, __s, __osz) \
185 (__glibc_unsigned_or_positive (__l) \
186 && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \
188 && !__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), __s, __osz))
190 /* Fortify function f. __f_alias, __f_chk and __f_chk_warn must be
193 #define __glibc_fortify(f, __l, __s, __osz, ...) \
194 (__glibc_safe_or_unknown_len (__l, __s, __osz) \
195 ? __ ## f ## _alias (__VA_ARGS__) \
196 : (__glibc_unsafe_len (__l, __s, __osz) \
197 ? __ ## f ## _chk_warn (__VA_ARGS__, __osz) \
198 : __ ## f ## _chk (__VA_ARGS__, __osz)))
200 /* Fortify function f, where object size argument passed to f is the number of
201 elements and not total size. */
203 #define __glibc_fortify_n(f, __l, __s, __osz, ...) \
204 (__glibc_safe_or_unknown_len (__l, __s, __osz) \
205 ? __ ## f ## _alias (__VA_ARGS__) \
206 : (__glibc_unsafe_len (__l, __s, __osz) \
207 ? __ ## f ## _chk_warn (__VA_ARGS__, (__osz) / (__s)) \
208 : __ ## f ## _chk (__VA_ARGS__, (__osz) / (__s))))
211 #if __GNUC_PREREQ (4,3)
212 # define __warnattr(msg) __attribute__((__warning__ (msg)))
213 # define __errordecl(name, msg) \
214 extern void name (void) __attribute__((__error__ (msg)))
216 # define __warnattr(msg)
217 # define __errordecl(name, msg) extern void name (void)
220 /* Support for flexible arrays.
221 Headers that should use flexible arrays only if they're "real"
222 (e.g. only if they won't affect sizeof()) should test
223 #if __glibc_c99_flexarr_available. */
224 #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc
225 # define __flexarr []
226 # define __glibc_c99_flexarr_available 1
227 #elif __GNUC_PREREQ (2,97) || defined __clang__
228 /* GCC 2.97 and clang support C99 flexible array members as an extension,
229 even when in C89 mode or compiling C++ (any version). */
230 # define __flexarr []
231 # define __glibc_c99_flexarr_available 1
232 #elif defined __GNUC__
233 /* Pre-2.97 GCC did not support C99 flexible arrays but did have
234 an equivalent extension with slightly different notation. */
235 # define __flexarr [0]
236 # define __glibc_c99_flexarr_available 1
238 /* Some other non-C99 compiler. Approximate with [1]. */
239 # define __flexarr [1]
240 # define __glibc_c99_flexarr_available 0
244 /* __asm__ ("xyz") is used throughout the headers to rename functions
245 at the assembly language level. This is wrapped by the __REDIRECT
246 macro, in order to support compilers that can do this some other
247 way. When compilers don't support asm-names at all, we have to do
248 preprocessor tricks instead (which don't have exactly the right
249 semantics, but it's the best we can do).
252 int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
254 #if (defined __GNUC__ && __GNUC__ >= 2) || (__clang_major__ >= 4)
256 # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
258 # define __REDIRECT_NTH(name, proto, alias) \
259 name proto __THROW __asm__ (__ASMNAME (#alias))
260 # define __REDIRECT_NTHNL(name, proto, alias) \
261 name proto __THROWNL __asm__ (__ASMNAME (#alias))
263 # define __REDIRECT_NTH(name, proto, alias) \
264 name proto __asm__ (__ASMNAME (#alias)) __THROW
265 # define __REDIRECT_NTHNL(name, proto, alias) \
266 name proto __asm__ (__ASMNAME (#alias)) __THROWNL
268 # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
269 # define __ASMNAME2(prefix, cname) __STRING (prefix) cname
272 #elif __SOME_OTHER_COMPILER__
274 # define __REDIRECT(name, proto, alias) name proto; \
275 _Pragma("let " #name " = " #alias)
279 /* GCC and clang have various useful declarations that can be made with
280 the '__attribute__' syntax. All of the ways we use this do fine if
281 they are omitted for compilers that don't understand it. */
282 #if !(defined __GNUC__ || defined __clang__)
283 # define __attribute__(xyz) /* Ignore */
286 /* At some point during the gcc 2.96 development the `malloc' attribute
287 for functions was introduced. We don't want to use it unconditionally
288 (although this would be possible) since it generates warnings. */
289 #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__malloc__)
290 # define __attribute_malloc__ __attribute__ ((__malloc__))
292 # define __attribute_malloc__ /* Ignore */
295 /* Tell the compiler which arguments to an allocation function
296 indicate the size of the allocation. */
297 #if __GNUC_PREREQ (4, 3)
298 # define __attribute_alloc_size__(params) \
299 __attribute__ ((__alloc_size__ params))
301 # define __attribute_alloc_size__(params) /* Ignore. */
304 /* Tell the compiler which argument to an allocation function
305 indicates the alignment of the allocation. */
306 #if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__alloc_align__)
307 # define __attribute_alloc_align__(param) \
308 __attribute__ ((__alloc_align__ param))
310 # define __attribute_alloc_align__(param) /* Ignore. */
313 /* At some point during the gcc 2.96 development the `pure' attribute
314 for functions was introduced. We don't want to use it unconditionally
315 (although this would be possible) since it generates warnings. */
316 #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__pure__)
317 # define __attribute_pure__ __attribute__ ((__pure__))
319 # define __attribute_pure__ /* Ignore */
322 /* This declaration tells the compiler that the value is constant. */
323 #if __GNUC_PREREQ (2,5) || __glibc_has_attribute (__const__)
324 # define __attribute_const__ __attribute__ ((__const__))
326 # define __attribute_const__ /* Ignore */
329 #if __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__)
330 # define __attribute_maybe_unused__ __attribute__ ((__unused__))
332 # define __attribute_maybe_unused__ /* Ignore */
335 /* At some point during the gcc 3.1 development the `used' attribute
336 for functions was introduced. We don't want to use it unconditionally
337 (although this would be possible) since it generates warnings. */
338 #if __GNUC_PREREQ (3,1) || __glibc_has_attribute (__used__)
339 # define __attribute_used__ __attribute__ ((__used__))
340 # define __attribute_noinline__ __attribute__ ((__noinline__))
342 # define __attribute_used__ __attribute__ ((__unused__))
343 # define __attribute_noinline__ /* Ignore */
346 /* Since version 3.2, gcc allows marking deprecated functions. */
347 #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__deprecated__)
348 # define __attribute_deprecated__ __attribute__ ((__deprecated__))
350 # define __attribute_deprecated__ /* Ignore */
353 /* Since version 4.5, gcc also allows one to specify the message printed
354 when a deprecated function is used. clang claims to be gcc 4.2, but
355 may also support this feature. */
356 #if __GNUC_PREREQ (4,5) \
357 || __glibc_has_extension (__attribute_deprecated_with_message__)
358 # define __attribute_deprecated_msg__(msg) \
359 __attribute__ ((__deprecated__ (msg)))
361 # define __attribute_deprecated_msg__(msg) __attribute_deprecated__
364 /* At some point during the gcc 2.8 development the `format_arg' attribute
365 for functions was introduced. We don't want to use it unconditionally
366 (although this would be possible) since it generates warnings.
367 If several `format_arg' attributes are given for the same function, in
368 gcc-3.0 and older, all but the last one are ignored. In newer gccs,
369 all designated arguments are considered. */
370 #if __GNUC_PREREQ (2,8) || __glibc_has_attribute (__format_arg__)
371 # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
373 # define __attribute_format_arg__(x) /* Ignore */
376 /* At some point during the gcc 2.97 development the `strfmon' format
377 attribute for functions was introduced. We don't want to use it
378 unconditionally (although this would be possible) since it
379 generates warnings. */
380 #if __GNUC_PREREQ (2,97) || __glibc_has_attribute (__format__)
381 # define __attribute_format_strfmon__(a,b) \
382 __attribute__ ((__format__ (__strfmon__, a, b)))
384 # define __attribute_format_strfmon__(a,b) /* Ignore */
387 /* The nonnull function attribute marks pointer parameters that
388 must not be NULL. This has the name __nonnull in glibc,
389 and __attribute_nonnull__ in files shared with Gnulib to avoid
390 collision with a different __nonnull in DragonFlyBSD 5.9. */
391 #ifndef __attribute_nonnull__
392 # if __GNUC_PREREQ (3,3) || __glibc_has_attribute (__nonnull__)
393 # define __attribute_nonnull__(params) __attribute__ ((__nonnull__ params))
395 # define __attribute_nonnull__(params)
399 # define __nonnull(params) __attribute_nonnull__ (params)
402 /* The returns_nonnull function attribute marks the return type of the function
403 as always being non-null. */
404 #ifndef __returns_nonnull
405 # if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__returns_nonnull__)
406 # define __returns_nonnull __attribute__ ((__returns_nonnull__))
408 # define __returns_nonnull
412 /* If fortification mode, we warn about unused results of certain
413 function calls which can lead to problems. */
414 #if __GNUC_PREREQ (3,4) || __glibc_has_attribute (__warn_unused_result__)
415 # define __attribute_warn_unused_result__ \
416 __attribute__ ((__warn_unused_result__))
417 # if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0
418 # define __wur __attribute_warn_unused_result__
421 # define __attribute_warn_unused_result__ /* empty */
424 # define __wur /* Ignore */
427 /* Forces a function to be always inlined. */
428 #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__always_inline__)
429 /* The Linux kernel defines __always_inline in stddef.h (283d7573), and
430 it conflicts with this definition. Therefore undefine it first to
431 allow either header to be included first. */
432 # undef __always_inline
433 # define __always_inline __inline __attribute__ ((__always_inline__))
435 # undef __always_inline
436 # define __always_inline __inline
439 /* Associate error messages with the source location of the call site rather
440 than with the source location inside the function. */
441 #if __GNUC_PREREQ (4,3) || __glibc_has_attribute (__artificial__)
442 # define __attribute_artificial__ __attribute__ ((__artificial__))
444 # define __attribute_artificial__ /* Ignore */
447 /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
448 inline semantics, unless -fgnu89-inline is used. Using __GNUC_STDC_INLINE__
449 or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions
450 older than 4.3 may define these macros and still not guarantee GNU inlining
453 clang++ identifies itself as gcc-4.2, but has support for GNU inlining
454 semantics, that can be checked for by using the __GNUC_STDC_INLINE_ and
455 __GNUC_GNU_INLINE__ macro definitions. */
456 #if (!defined __cplusplus || __GNUC_PREREQ (4,3) \
457 || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \
458 || defined __GNUC_GNU_INLINE__)))
459 # if defined __GNUC_STDC_INLINE__ || defined __cplusplus
460 # define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
461 # define __extern_always_inline \
462 extern __always_inline __attribute__ ((__gnu_inline__))
464 # define __extern_inline extern __inline
465 # define __extern_always_inline extern __always_inline
469 #ifdef __extern_always_inline
470 # define __fortify_function __extern_always_inline __attribute_artificial__
473 /* GCC 4.3 and above allow passing all anonymous arguments of an
474 __extern_always_inline function to some other vararg function. */
475 #if __GNUC_PREREQ (4,3)
476 # define __va_arg_pack() __builtin_va_arg_pack ()
477 # define __va_arg_pack_len() __builtin_va_arg_pack_len ()
480 /* It is possible to compile containing GCC extensions even if GCC is
481 run in pedantic mode if the uses are carefully marked using the
482 `__extension__' keyword. But this is not generally available before
484 #if !(__GNUC_PREREQ (2,8) || defined __clang__)
485 # define __extension__ /* Ignore */
488 /* __restrict is known in EGCS 1.2 and above, and in clang.
489 It works also in C++ mode (outside of arrays), but only when spelled
490 as '__restrict', not 'restrict'. */
491 #if !(__GNUC_PREREQ (2,92) || __clang_major__ >= 3)
492 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
493 # define __restrict restrict
495 # define __restrict /* Ignore */
499 /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is
501 GCC 3.1 and clang support this.
502 This syntax is not usable in C++ mode. */
503 #if (__GNUC_PREREQ (3,1) || __clang_major__ >= 3) && !defined __cplusplus
504 # define __restrict_arr __restrict
507 # define __restrict_arr /* Not supported in old GCC. */
509 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
510 # define __restrict_arr restrict
512 /* Some other non-C99 compiler. */
513 # define __restrict_arr /* Not supported. */
518 #if (__GNUC__ >= 3) || __glibc_has_builtin (__builtin_expect)
519 # define __glibc_unlikely(cond) __builtin_expect ((cond), 0)
520 # define __glibc_likely(cond) __builtin_expect ((cond), 1)
522 # define __glibc_unlikely(cond) (cond)
523 # define __glibc_likely(cond) (cond)
526 #if (!defined _Noreturn \
527 && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
528 && !(__GNUC_PREREQ (4,7) \
529 || (3 < __clang_major__ + (5 <= __clang_minor__))))
530 # if __GNUC_PREREQ (2,8)
531 # define _Noreturn __attribute__ ((__noreturn__))
537 #if __GNUC_PREREQ (8, 0)
538 /* Describes a char array whose address can safely be passed as the first
539 argument to strncpy and strncat, as the char array is not necessarily
540 a NUL-terminated string. */
541 # define __attribute_nonstring__ __attribute__ ((__nonstring__))
543 # define __attribute_nonstring__
546 /* Undefine (also defined in libc-symbols.h). */
547 #undef __attribute_copy__
548 #if __GNUC_PREREQ (9, 0)
549 /* Copies attributes from the declaration or type referenced by
551 # define __attribute_copy__(arg) __attribute__ ((__copy__ (arg)))
553 # define __attribute_copy__(arg)
556 #if (!defined _Static_assert && !defined __cplusplus \
557 && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
558 && (!(__GNUC_PREREQ (4, 6) || __clang_major__ >= 4) \
559 || defined __STRICT_ANSI__))
560 # define _Static_assert(expr, diagnostic) \
561 extern int (*__Static_assert_function (void)) \
562 [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
565 /* Gnulib avoids including these, as they don't work on non-glibc or
566 older glibc platforms. */
567 #ifndef __GNULIB_CDEFS
568 # include <bits/wordsize.h>
569 # include <bits/long-double.h>
572 #if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
575 /* Alias name defined automatically. */
576 # define __LDBL_REDIR(name, proto) ... unused__ldbl_redir
577 # define __LDBL_REDIR_DECL(name) \
578 extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128"));
580 /* Alias name defined automatically, with leading underscores. */
581 # define __LDBL_REDIR2_DECL(name) \
582 extern __typeof (__##name) __##name \
583 __asm (__ASMNAME ("__" #name "ieee128"));
585 /* Alias name defined manually. */
586 # define __LDBL_REDIR1(name, proto, alias) ... unused__ldbl_redir1
587 # define __LDBL_REDIR1_DECL(name, alias) \
588 extern __typeof (name) name __asm (__ASMNAME (#alias));
590 # define __LDBL_REDIR1_NTH(name, proto, alias) \
591 __REDIRECT_NTH (name, proto, alias)
592 # define __REDIRECT_NTH_LDBL(name, proto, alias) \
593 __LDBL_REDIR1_NTH (name, proto, __##alias##ieee128)
596 # define __REDIRECT_LDBL(name, proto, alias) ... unused__redirect_ldbl
597 # define __LDBL_REDIR_NTH(name, proto) ... unused__ldbl_redir_nth
600 _Static_assert (0, "IEEE 128-bits long double requires redirection on this platform");
602 #elif defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
603 # define __LDBL_COMPAT 1
605 # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias)
606 # define __LDBL_REDIR(name, proto) \
607 __LDBL_REDIR1 (name, proto, __nldbl_##name)
608 # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias)
609 # define __LDBL_REDIR_NTH(name, proto) \
610 __LDBL_REDIR1_NTH (name, proto, __nldbl_##name)
611 # define __LDBL_REDIR2_DECL(name) \
612 extern __typeof (__##name) __##name __asm (__ASMNAME ("__nldbl___" #name));
613 # define __LDBL_REDIR1_DECL(name, alias) \
614 extern __typeof (name) name __asm (__ASMNAME (#alias));
615 # define __LDBL_REDIR_DECL(name) \
616 extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name));
617 # define __REDIRECT_LDBL(name, proto, alias) \
618 __LDBL_REDIR1 (name, proto, __nldbl_##alias)
619 # define __REDIRECT_NTH_LDBL(name, proto, alias) \
620 __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias)
623 #if (!defined __LDBL_COMPAT && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0) \
624 || !defined __REDIRECT
625 # define __LDBL_REDIR1(name, proto, alias) name proto
626 # define __LDBL_REDIR(name, proto) name proto
627 # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW
628 # define __LDBL_REDIR_NTH(name, proto) name proto __THROW
629 # define __LDBL_REDIR2_DECL(name)
630 # define __LDBL_REDIR_DECL(name)
632 # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias)
633 # define __REDIRECT_NTH_LDBL(name, proto, alias) \
634 __REDIRECT_NTH (name, proto, alias)
638 /* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is
639 intended for use in preprocessor macros.
641 Note: MESSAGE must be a _single_ string; concatenation of string
642 literals is not supported. */
643 #if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5)
644 # define __glibc_macro_warning1(message) _Pragma (#message)
645 # define __glibc_macro_warning(message) \
646 __glibc_macro_warning1 (GCC warning message)
648 # define __glibc_macro_warning(msg)
651 /* Generic selection (ISO C11) is a C-only feature, available in GCC
652 since version 4.9. Previous versions do not provide generic
653 selection, even though they might set __STDC_VERSION__ to 201112L,
654 when in -std=c11 mode. Thus, we must check for !defined __GNUC__
655 when testing __STDC_VERSION__ for generic selection support.
656 On the other hand, Clang also defines __GNUC__, so a clang-specific
657 check is required to enable the use of generic selection. */
658 #if !defined __cplusplus \
659 && (__GNUC_PREREQ (4, 9) \
660 || __glibc_has_extension (c_generic_selections) \
661 || (!defined __GNUC__ && defined __STDC_VERSION__ \
662 && __STDC_VERSION__ >= 201112L))
663 # define __HAVE_GENERIC_SELECTION 1
665 # define __HAVE_GENERIC_SELECTION 0
668 #if __GNUC_PREREQ (10, 0)
669 /* Designates a 1-based positional argument ref-index of pointer type
670 that can be used to access size-index elements of the pointed-to
671 array according to access mode, or at least one element when
672 size-index is not provided:
673 access (access-mode, <ref-index> [, <size-index>]) */
674 # define __attr_access(x) __attribute__ ((__access__ x))
675 /* For _FORTIFY_SOURCE == 3 we use __builtin_dynamic_object_size, which may
676 use the access attribute to get object sizes from function definition
677 arguments, so we can't use them on functions we fortify. Drop the object
678 size hints for such functions. */
679 # if __USE_FORTIFY_LEVEL == 3
680 # define __fortified_attr_access(a, o, s) __attribute__ ((__access__ (a, o)))
682 # define __fortified_attr_access(a, o, s) __attr_access ((a, o, s))
684 # if __GNUC_PREREQ (11, 0)
685 # define __attr_access_none(argno) __attribute__ ((__access__ (__none__, argno)))
687 # define __attr_access_none(argno)
690 # define __fortified_attr_access(a, o, s)
691 # define __attr_access(x)
692 # define __attr_access_none(argno)
695 #if __GNUC_PREREQ (11, 0)
696 /* Designates dealloc as a function to call to deallocate objects
697 allocated by the declared function. */
698 # define __attr_dealloc(dealloc, argno) \
699 __attribute__ ((__malloc__ (dealloc, argno)))
700 # define __attr_dealloc_free __attr_dealloc (__builtin_free, 1)
702 # define __attr_dealloc(dealloc, argno)
703 # define __attr_dealloc_free
706 /* Specify that a function such as setjmp or vfork may return
708 #if __GNUC_PREREQ (4, 1)
709 # define __attribute_returns_twice__ __attribute__ ((__returns_twice__))
711 # define __attribute_returns_twice__ /* Ignore. */
714 #endif /* sys/cdefs.h */