1 | /* Copyright (C) 1992-2021 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #ifndef _SYS_CDEFS_H |
19 | #define _SYS_CDEFS_H 1 |
20 | |
21 | /* We are almost always included from features.h. */ |
22 | #ifndef _FEATURES_H |
23 | # include <features.h> |
24 | #endif |
25 | |
26 | /* The GNU libc does not support any K&R compilers or the traditional mode |
27 | of ISO C compilers anymore. Check for some of the combinations not |
28 | supported anymore. */ |
29 | #if defined __GNUC__ && !defined __STDC__ |
30 | # error "You need a ISO C conforming compiler to use the glibc headers" |
31 | #endif |
32 | |
33 | /* Some user header file might have defined this before. */ |
34 | #undef __P |
35 | #undef __PMT |
36 | |
37 | #ifdef __GNUC__ |
38 | |
39 | /* All functions, except those with callbacks or those that |
40 | synchronize memory, are leaf functions. */ |
41 | # if __GNUC_PREREQ (4, 6) && !defined _LIBC |
42 | # define __LEAF , __leaf__ |
43 | # define __LEAF_ATTR __attribute__ ((__leaf__)) |
44 | # else |
45 | # define __LEAF |
46 | # define __LEAF_ATTR |
47 | # endif |
48 | |
49 | /* GCC can always grok prototypes. For C++ programs we add throw() |
50 | to help it optimize the function calls. But this only works with |
51 | gcc 2.8.x and egcs. For gcc 3.2 and up we even mark C functions |
52 | as non-throwing using a function attribute since programs can use |
53 | the -fexceptions options for C code as well. */ |
54 | # if !defined __cplusplus && __GNUC_PREREQ (3, 3) |
55 | # define __THROW __attribute__ ((__nothrow__ __LEAF)) |
56 | # define __THROWNL __attribute__ ((__nothrow__)) |
57 | # define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) fct |
58 | # define __NTHNL(fct) __attribute__ ((__nothrow__)) fct |
59 | # else |
60 | # if defined __cplusplus && __GNUC_PREREQ (2,8) |
61 | # if __cplusplus >= 201103L |
62 | # define __THROW noexcept (true) |
63 | # else |
64 | # define __THROW throw () |
65 | # endif |
66 | # define __THROWNL __THROW |
67 | # define __NTH(fct) __LEAF_ATTR fct __THROW |
68 | # define __NTHNL(fct) fct __THROW |
69 | # else |
70 | # define __THROW |
71 | # define __THROWNL |
72 | # define __NTH(fct) fct |
73 | # define __NTHNL(fct) fct |
74 | # endif |
75 | # endif |
76 | |
77 | #else /* Not GCC. */ |
78 | |
79 | # if (defined __cplusplus \ |
80 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) |
81 | # define __inline inline |
82 | # else |
83 | # define __inline /* No inline functions. */ |
84 | # endif |
85 | |
86 | # define __THROW |
87 | # define __THROWNL |
88 | # define __NTH(fct) fct |
89 | |
90 | #endif /* GCC. */ |
91 | |
92 | /* Compilers that are not clang may object to |
93 | #if defined __clang__ && __has_extension(...) |
94 | even though they do not need to evaluate the right-hand side of the &&. */ |
95 | #if defined __clang__ && defined __has_extension |
96 | # define __glibc_clang_has_extension(ext) __has_extension (ext) |
97 | #else |
98 | # define __glibc_clang_has_extension(ext) 0 |
99 | #endif |
100 | |
101 | /* These two macros are not used in glibc anymore. They are kept here |
102 | only because some other projects expect the macros to be defined. */ |
103 | #define __P(args) args |
104 | #define __PMT(args) args |
105 | |
106 | /* For these things, GCC behaves the ANSI way normally, |
107 | and the non-ANSI way under -traditional. */ |
108 | |
109 | #define __CONCAT(x,y) x ## y |
110 | #define __STRING(x) #x |
111 | |
112 | /* This is not a typedef so `const __ptr_t' does the right thing. */ |
113 | #define __ptr_t void * |
114 | |
115 | |
116 | /* C++ needs to know that types and declarations are C, not C++. */ |
117 | #ifdef __cplusplus |
118 | # define __BEGIN_DECLS extern "C" { |
119 | # define __END_DECLS } |
120 | #else |
121 | # define __BEGIN_DECLS |
122 | # define __END_DECLS |
123 | #endif |
124 | |
125 | |
126 | /* Fortify support. */ |
127 | #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1) |
128 | #define __bos0(ptr) __builtin_object_size (ptr, 0) |
129 | |
130 | /* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available. */ |
131 | #if __USE_FORTIFY_LEVEL == 3 && __glibc_clang_prereq (9, 0) |
132 | # define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0) |
133 | # define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1) |
134 | #else |
135 | # define __glibc_objsize0(__o) __bos0 (__o) |
136 | # define __glibc_objsize(__o) __bos (__o) |
137 | #endif |
138 | |
139 | #if __GNUC_PREREQ (4,3) |
140 | # define __warnattr(msg) __attribute__((__warning__ (msg))) |
141 | # define __errordecl(name, msg) \ |
142 | extern void name (void) __attribute__((__error__ (msg))) |
143 | #else |
144 | # define __warnattr(msg) |
145 | # define __errordecl(name, msg) extern void name (void) |
146 | #endif |
147 | |
148 | /* Support for flexible arrays. |
149 | Headers that should use flexible arrays only if they're "real" |
150 | (e.g. only if they won't affect sizeof()) should test |
151 | #if __glibc_c99_flexarr_available. */ |
152 | #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L |
153 | # define __flexarr [] |
154 | # define __glibc_c99_flexarr_available 1 |
155 | #elif __GNUC_PREREQ (2,97) |
156 | /* GCC 2.97 supports C99 flexible array members as an extension, |
157 | even when in C89 mode or compiling C++ (any version). */ |
158 | # define __flexarr [] |
159 | # define __glibc_c99_flexarr_available 1 |
160 | #elif defined __GNUC__ |
161 | /* Pre-2.97 GCC did not support C99 flexible arrays but did have |
162 | an equivalent extension with slightly different notation. */ |
163 | # define __flexarr [0] |
164 | # define __glibc_c99_flexarr_available 1 |
165 | #else |
166 | /* Some other non-C99 compiler. Approximate with [1]. */ |
167 | # define __flexarr [1] |
168 | # define __glibc_c99_flexarr_available 0 |
169 | #endif |
170 | |
171 | |
172 | /* __asm__ ("xyz") is used throughout the headers to rename functions |
173 | at the assembly language level. This is wrapped by the __REDIRECT |
174 | macro, in order to support compilers that can do this some other |
175 | way. When compilers don't support asm-names at all, we have to do |
176 | preprocessor tricks instead (which don't have exactly the right |
177 | semantics, but it's the best we can do). |
178 | |
179 | Example: |
180 | int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ |
181 | |
182 | #if defined __GNUC__ && __GNUC__ >= 2 |
183 | |
184 | # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) |
185 | # ifdef __cplusplus |
186 | # define __REDIRECT_NTH(name, proto, alias) \ |
187 | name proto __THROW __asm__ (__ASMNAME (#alias)) |
188 | # define __REDIRECT_NTHNL(name, proto, alias) \ |
189 | name proto __THROWNL __asm__ (__ASMNAME (#alias)) |
190 | # else |
191 | # define __REDIRECT_NTH(name, proto, alias) \ |
192 | name proto __asm__ (__ASMNAME (#alias)) __THROW |
193 | # define __REDIRECT_NTHNL(name, proto, alias) \ |
194 | name proto __asm__ (__ASMNAME (#alias)) __THROWNL |
195 | # endif |
196 | # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) |
197 | # define __ASMNAME2(prefix, cname) __STRING (prefix) cname |
198 | |
199 | /* |
200 | #elif __SOME_OTHER_COMPILER__ |
201 | |
202 | # define __REDIRECT(name, proto, alias) name proto; \ |
203 | _Pragma("let " #name " = " #alias) |
204 | */ |
205 | #endif |
206 | |
207 | /* GCC has various useful declarations that can be made with the |
208 | `__attribute__' syntax. All of the ways we use this do fine if |
209 | they are omitted for compilers that don't understand it. */ |
210 | #if !defined __GNUC__ || __GNUC__ < 2 |
211 | # define __attribute__(xyz) /* Ignore */ |
212 | #endif |
213 | |
214 | /* At some point during the gcc 2.96 development the `malloc' attribute |
215 | for functions was introduced. We don't want to use it unconditionally |
216 | (although this would be possible) since it generates warnings. */ |
217 | #if __GNUC_PREREQ (2,96) |
218 | # define __attribute_malloc__ __attribute__ ((__malloc__)) |
219 | #else |
220 | # define __attribute_malloc__ /* Ignore */ |
221 | #endif |
222 | |
223 | /* Tell the compiler which arguments to an allocation function |
224 | indicate the size of the allocation. */ |
225 | #if __GNUC_PREREQ (4, 3) |
226 | # define __attribute_alloc_size__(params) \ |
227 | __attribute__ ((__alloc_size__ params)) |
228 | #else |
229 | # define __attribute_alloc_size__(params) /* Ignore. */ |
230 | #endif |
231 | |
232 | /* At some point during the gcc 2.96 development the `pure' attribute |
233 | for functions was introduced. We don't want to use it unconditionally |
234 | (although this would be possible) since it generates warnings. */ |
235 | #if __GNUC_PREREQ (2,96) |
236 | # define __attribute_pure__ __attribute__ ((__pure__)) |
237 | #else |
238 | # define __attribute_pure__ /* Ignore */ |
239 | #endif |
240 | |
241 | /* This declaration tells the compiler that the value is constant. */ |
242 | #if __GNUC_PREREQ (2,5) |
243 | # define __attribute_const__ __attribute__ ((__const__)) |
244 | #else |
245 | # define __attribute_const__ /* Ignore */ |
246 | #endif |
247 | |
248 | /* At some point during the gcc 3.1 development the `used' attribute |
249 | for functions was introduced. We don't want to use it unconditionally |
250 | (although this would be possible) since it generates warnings. */ |
251 | #if __GNUC_PREREQ (3,1) |
252 | # define __attribute_used__ __attribute__ ((__used__)) |
253 | # define __attribute_noinline__ __attribute__ ((__noinline__)) |
254 | #else |
255 | # define __attribute_used__ __attribute__ ((__unused__)) |
256 | # define __attribute_noinline__ /* Ignore */ |
257 | #endif |
258 | |
259 | /* Since version 3.2, gcc allows marking deprecated functions. */ |
260 | #if __GNUC_PREREQ (3,2) |
261 | # define __attribute_deprecated__ __attribute__ ((__deprecated__)) |
262 | #else |
263 | # define __attribute_deprecated__ /* Ignore */ |
264 | #endif |
265 | |
266 | /* Since version 4.5, gcc also allows one to specify the message printed |
267 | when a deprecated function is used. clang claims to be gcc 4.2, but |
268 | may also support this feature. */ |
269 | #if __GNUC_PREREQ (4,5) \ |
270 | || __glibc_clang_has_extension (__attribute_deprecated_with_message__) |
271 | # define __attribute_deprecated_msg__(msg) \ |
272 | __attribute__ ((__deprecated__ (msg))) |
273 | #else |
274 | # define __attribute_deprecated_msg__(msg) __attribute_deprecated__ |
275 | #endif |
276 | |
277 | /* At some point during the gcc 2.8 development the `format_arg' 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 several `format_arg' attributes are given for the same function, in |
281 | gcc-3.0 and older, all but the last one are ignored. In newer gccs, |
282 | all designated arguments are considered. */ |
283 | #if __GNUC_PREREQ (2,8) |
284 | # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) |
285 | #else |
286 | # define __attribute_format_arg__(x) /* Ignore */ |
287 | #endif |
288 | |
289 | /* At some point during the gcc 2.97 development the `strfmon' format |
290 | attribute for functions was introduced. We don't want to use it |
291 | unconditionally (although this would be possible) since it |
292 | generates warnings. */ |
293 | #if __GNUC_PREREQ (2,97) |
294 | # define __attribute_format_strfmon__(a,b) \ |
295 | __attribute__ ((__format__ (__strfmon__, a, b))) |
296 | #else |
297 | # define __attribute_format_strfmon__(a,b) /* Ignore */ |
298 | #endif |
299 | |
300 | /* The nonull function attribute allows to mark pointer parameters which |
301 | must not be NULL. */ |
302 | #if __GNUC_PREREQ (3,3) |
303 | # define __nonnull(params) __attribute__ ((__nonnull__ params)) |
304 | #else |
305 | # define __nonnull(params) |
306 | #endif |
307 | |
308 | /* If fortification mode, we warn about unused results of certain |
309 | function calls which can lead to problems. */ |
310 | #if __GNUC_PREREQ (3,4) |
311 | # define __attribute_warn_unused_result__ \ |
312 | __attribute__ ((__warn_unused_result__)) |
313 | # if __USE_FORTIFY_LEVEL > 0 |
314 | # define __wur __attribute_warn_unused_result__ |
315 | # endif |
316 | #else |
317 | # define __attribute_warn_unused_result__ /* empty */ |
318 | #endif |
319 | #ifndef __wur |
320 | # define __wur /* Ignore */ |
321 | #endif |
322 | |
323 | /* Forces a function to be always inlined. */ |
324 | #if __GNUC_PREREQ (3,2) |
325 | /* The Linux kernel defines __always_inline in stddef.h (283d7573), and |
326 | it conflicts with this definition. Therefore undefine it first to |
327 | allow either header to be included first. */ |
328 | # undef __always_inline |
329 | # define __always_inline __inline __attribute__ ((__always_inline__)) |
330 | #else |
331 | # undef __always_inline |
332 | # define __always_inline __inline |
333 | #endif |
334 | |
335 | /* Associate error messages with the source location of the call site rather |
336 | than with the source location inside the function. */ |
337 | #if __GNUC_PREREQ (4,3) |
338 | # define __attribute_artificial__ __attribute__ ((__artificial__)) |
339 | #else |
340 | # define __attribute_artificial__ /* Ignore */ |
341 | #endif |
342 | |
343 | /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99 |
344 | inline semantics, unless -fgnu89-inline is used. Using __GNUC_STDC_INLINE__ |
345 | or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions |
346 | older than 4.3 may define these macros and still not guarantee GNU inlining |
347 | semantics. |
348 | |
349 | clang++ identifies itself as gcc-4.2, but has support for GNU inlining |
350 | semantics, that can be checked for by using the __GNUC_STDC_INLINE_ and |
351 | __GNUC_GNU_INLINE__ macro definitions. */ |
352 | #if (!defined __cplusplus || __GNUC_PREREQ (4,3) \ |
353 | || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \ |
354 | || defined __GNUC_GNU_INLINE__))) |
355 | # if defined __GNUC_STDC_INLINE__ || defined __cplusplus |
356 | # define __extern_inline extern __inline __attribute__ ((__gnu_inline__)) |
357 | # define __extern_always_inline \ |
358 | extern __always_inline __attribute__ ((__gnu_inline__)) |
359 | # else |
360 | # define __extern_inline extern __inline |
361 | # define __extern_always_inline extern __always_inline |
362 | # endif |
363 | #endif |
364 | |
365 | #ifdef __extern_always_inline |
366 | # define __fortify_function __extern_always_inline __attribute_artificial__ |
367 | #endif |
368 | |
369 | /* GCC 4.3 and above allow passing all anonymous arguments of an |
370 | __extern_always_inline function to some other vararg function. */ |
371 | #if __GNUC_PREREQ (4,3) |
372 | # define __va_arg_pack() __builtin_va_arg_pack () |
373 | # define __va_arg_pack_len() __builtin_va_arg_pack_len () |
374 | #endif |
375 | |
376 | /* It is possible to compile containing GCC extensions even if GCC is |
377 | run in pedantic mode if the uses are carefully marked using the |
378 | `__extension__' keyword. But this is not generally available before |
379 | version 2.8. */ |
380 | #if !__GNUC_PREREQ (2,8) |
381 | # define __extension__ /* Ignore */ |
382 | #endif |
383 | |
384 | /* __restrict is known in EGCS 1.2 and above. */ |
385 | #if !__GNUC_PREREQ (2,92) |
386 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L |
387 | # define __restrict restrict |
388 | # else |
389 | # define __restrict /* Ignore */ |
390 | # endif |
391 | #endif |
392 | |
393 | /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is |
394 | array_name[restrict] |
395 | GCC 3.1 supports this. */ |
396 | #if __GNUC_PREREQ (3,1) && !defined __GNUG__ |
397 | # define __restrict_arr __restrict |
398 | #else |
399 | # ifdef __GNUC__ |
400 | # define __restrict_arr /* Not supported in old GCC. */ |
401 | # else |
402 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L |
403 | # define __restrict_arr restrict |
404 | # else |
405 | /* Some other non-C99 compiler. */ |
406 | # define __restrict_arr /* Not supported. */ |
407 | # endif |
408 | # endif |
409 | #endif |
410 | |
411 | #if __GNUC__ >= 3 |
412 | # define __glibc_unlikely(cond) __builtin_expect ((cond), 0) |
413 | # define __glibc_likely(cond) __builtin_expect ((cond), 1) |
414 | #else |
415 | # define __glibc_unlikely(cond) (cond) |
416 | # define __glibc_likely(cond) (cond) |
417 | #endif |
418 | |
419 | #ifdef __has_attribute |
420 | # define __glibc_has_attribute(attr) __has_attribute (attr) |
421 | #else |
422 | # define __glibc_has_attribute(attr) 0 |
423 | #endif |
424 | |
425 | #if (!defined _Noreturn \ |
426 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ |
427 | && !__GNUC_PREREQ (4,7)) |
428 | # if __GNUC_PREREQ (2,8) |
429 | # define _Noreturn __attribute__ ((__noreturn__)) |
430 | # else |
431 | # define _Noreturn |
432 | # endif |
433 | #endif |
434 | |
435 | #if __GNUC_PREREQ (8, 0) |
436 | /* Describes a char array whose address can safely be passed as the first |
437 | argument to strncpy and strncat, as the char array is not necessarily |
438 | a NUL-terminated string. */ |
439 | # define __attribute_nonstring__ __attribute__ ((__nonstring__)) |
440 | #else |
441 | # define __attribute_nonstring__ |
442 | #endif |
443 | |
444 | /* Undefine (also defined in libc-symbols.h). */ |
445 | #undef __attribute_copy__ |
446 | #if __GNUC_PREREQ (9, 0) |
447 | /* Copies attributes from the declaration or type referenced by |
448 | the argument. */ |
449 | # define __attribute_copy__(arg) __attribute__ ((__copy__ (arg))) |
450 | #else |
451 | # define __attribute_copy__(arg) |
452 | #endif |
453 | |
454 | #if (!defined _Static_assert && !defined __cplusplus \ |
455 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ |
456 | && (!__GNUC_PREREQ (4, 6) || defined __STRICT_ANSI__)) |
457 | # define _Static_assert(expr, diagnostic) \ |
458 | extern int (*__Static_assert_function (void)) \ |
459 | [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })] |
460 | #endif |
461 | |
462 | #include <bits/wordsize.h> |
463 | #include <bits/long-double.h> |
464 | |
465 | #if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 |
466 | # ifdef __REDIRECT |
467 | |
468 | /* Alias name defined automatically. */ |
469 | # define __LDBL_REDIR(name, proto) ... unused__ldbl_redir |
470 | # define __LDBL_REDIR_DECL(name) \ |
471 | extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128")); |
472 | |
473 | /* Alias name defined automatically, with leading underscores. */ |
474 | # define __LDBL_REDIR2_DECL(name) \ |
475 | extern __typeof (__##name) __##name \ |
476 | __asm (__ASMNAME ("__" #name "ieee128")); |
477 | |
478 | /* Alias name defined manually. */ |
479 | # define __LDBL_REDIR1(name, proto, alias) ... unused__ldbl_redir1 |
480 | # define __LDBL_REDIR1_DECL(name, alias) \ |
481 | extern __typeof (name) name __asm (__ASMNAME (#alias)); |
482 | |
483 | # define __LDBL_REDIR1_NTH(name, proto, alias) \ |
484 | __REDIRECT_NTH (name, proto, alias) |
485 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ |
486 | __LDBL_REDIR1_NTH (name, proto, __##alias##ieee128) |
487 | |
488 | /* Unused. */ |
489 | # define __REDIRECT_LDBL(name, proto, alias) ... unused__redirect_ldbl |
490 | # define __LDBL_REDIR_NTH(name, proto) ... unused__ldbl_redir_nth |
491 | |
492 | # else |
493 | _Static_assert (0, "IEEE 128-bits long double requires redirection on this platform" ); |
494 | # endif |
495 | #elif defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH |
496 | # define __LDBL_COMPAT 1 |
497 | # ifdef __REDIRECT |
498 | # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias) |
499 | # define __LDBL_REDIR(name, proto) \ |
500 | __LDBL_REDIR1 (name, proto, __nldbl_##name) |
501 | # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias) |
502 | # define __LDBL_REDIR_NTH(name, proto) \ |
503 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##name) |
504 | # define __LDBL_REDIR2_DECL(name) \ |
505 | extern __typeof (__##name) __##name __asm (__ASMNAME ("__nldbl___" #name)); |
506 | # define __LDBL_REDIR1_DECL(name, alias) \ |
507 | extern __typeof (name) name __asm (__ASMNAME (#alias)); |
508 | # define __LDBL_REDIR_DECL(name) \ |
509 | extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name)); |
510 | # define __REDIRECT_LDBL(name, proto, alias) \ |
511 | __LDBL_REDIR1 (name, proto, __nldbl_##alias) |
512 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ |
513 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias) |
514 | # endif |
515 | #endif |
516 | #if (!defined __LDBL_COMPAT && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0) \ |
517 | || !defined __REDIRECT |
518 | # define __LDBL_REDIR1(name, proto, alias) name proto |
519 | # define __LDBL_REDIR(name, proto) name proto |
520 | # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW |
521 | # define __LDBL_REDIR_NTH(name, proto) name proto __THROW |
522 | # define __LDBL_REDIR2_DECL(name) |
523 | # define __LDBL_REDIR_DECL(name) |
524 | # ifdef __REDIRECT |
525 | # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias) |
526 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ |
527 | __REDIRECT_NTH (name, proto, alias) |
528 | # endif |
529 | #endif |
530 | |
531 | /* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is |
532 | intended for use in preprocessor macros. |
533 | |
534 | Note: MESSAGE must be a _single_ string; concatenation of string |
535 | literals is not supported. */ |
536 | #if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5) |
537 | # define __glibc_macro_warning1(message) _Pragma (#message) |
538 | # define __glibc_macro_warning(message) \ |
539 | __glibc_macro_warning1 (GCC warning message) |
540 | #else |
541 | # define __glibc_macro_warning(msg) |
542 | #endif |
543 | |
544 | /* Generic selection (ISO C11) is a C-only feature, available in GCC |
545 | since version 4.9. Previous versions do not provide generic |
546 | selection, even though they might set __STDC_VERSION__ to 201112L, |
547 | when in -std=c11 mode. Thus, we must check for !defined __GNUC__ |
548 | when testing __STDC_VERSION__ for generic selection support. |
549 | On the other hand, Clang also defines __GNUC__, so a clang-specific |
550 | check is required to enable the use of generic selection. */ |
551 | #if !defined __cplusplus \ |
552 | && (__GNUC_PREREQ (4, 9) \ |
553 | || __glibc_clang_has_extension (c_generic_selections) \ |
554 | || (!defined __GNUC__ && defined __STDC_VERSION__ \ |
555 | && __STDC_VERSION__ >= 201112L)) |
556 | # define __HAVE_GENERIC_SELECTION 1 |
557 | #else |
558 | # define __HAVE_GENERIC_SELECTION 0 |
559 | #endif |
560 | |
561 | #if __GNUC_PREREQ (10, 0) |
562 | /* Designates a 1-based positional argument ref-index of pointer type |
563 | that can be used to access size-index elements of the pointed-to |
564 | array according to access mode, or at least one element when |
565 | size-index is not provided: |
566 | access (access-mode, <ref-index> [, <size-index>]) */ |
567 | #define __attr_access(x) __attribute__ ((__access__ x)) |
568 | #else |
569 | # define __attr_access(x) |
570 | #endif |
571 | |
572 | /* Specify that a function such as setjmp or vfork may return |
573 | twice. */ |
574 | #if __GNUC_PREREQ (4, 1) |
575 | # define __attribute_returns_twice__ __attribute__ ((__returns_twice__)) |
576 | #else |
577 | # define __attribute_returns_twice__ /* Ignore. */ |
578 | #endif |
579 | |
580 | #endif /* sys/cdefs.h */ |
581 | |