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1 | /* Copyright (C) 1992-2019 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 General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 3 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 | General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU 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 | anymore supported. */ | |
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 works only 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 | # define __THROW throw () | |
62 | # define __THROWNL throw () | |
63 | # define __NTH(fct) __LEAF_ATTR fct throw () | |
64 | # define __NTHNL(fct) fct throw () | |
65 | # else | |
66 | # define __THROW | |
67 | # define __THROWNL | |
68 | # define __NTH(fct) fct | |
69 | # define __NTHNL(fct) fct | |
70 | # endif | |
71 | # endif | |
72 | ||
73 | #else /* Not GCC. */ | |
74 | ||
75 | # if (defined __cplusplus \ | |
76 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) | |
77 | # define __inline inline | |
78 | # else | |
79 | # define __inline /* No inline functions. */ | |
80 | # endif | |
81 | ||
82 | # define __THROW | |
83 | # define __THROWNL | |
84 | # define __NTH(fct) fct | |
85 | ||
86 | #endif /* GCC. */ | |
87 | ||
88 | /* Compilers that are not clang may object to | |
89 | #if defined __clang__ && __has_extension(...) | |
90 | even though they do not need to evaluate the right-hand side of the &&. */ | |
91 | #if defined __clang__ && defined __has_extension | |
92 | # define __glibc_clang_has_extension(ext) __has_extension (ext) | |
93 | #else | |
94 | # define __glibc_clang_has_extension(ext) 0 | |
95 | #endif | |
96 | ||
97 | /* These two macros are not used in glibc anymore. They are kept here | |
98 | only because some other projects expect the macros to be defined. */ | |
99 | #define __P(args) args | |
100 | #define __PMT(args) args | |
101 | ||
102 | /* For these things, GCC behaves the ANSI way normally, | |
103 | and the non-ANSI way under -traditional. */ | |
104 | ||
105 | #define __CONCAT(x,y) x ## y | |
106 | #define __STRING(x) #x | |
107 | ||
108 | /* This is not a typedef so `const __ptr_t' does the right thing. */ | |
109 | #define __ptr_t void * | |
110 | ||
111 | ||
112 | /* C++ needs to know that types and declarations are C, not C++. */ | |
113 | #ifdef __cplusplus | |
114 | # define __BEGIN_DECLS extern "C" { | |
115 | # define __END_DECLS } | |
116 | #else | |
117 | # define __BEGIN_DECLS | |
118 | # define __END_DECLS | |
119 | #endif | |
120 | ||
121 | ||
122 | /* Fortify support. */ | |
123 | #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1) | |
124 | #define __bos0(ptr) __builtin_object_size (ptr, 0) | |
125 | ||
126 | #if __GNUC_PREREQ (4,3) | |
127 | # define __warndecl(name, msg) \ | |
128 | extern void name (void) __attribute__((__warning__ (msg))) | |
129 | # define __warnattr(msg) __attribute__((__warning__ (msg))) | |
130 | # define __errordecl(name, msg) \ | |
131 | extern void name (void) __attribute__((__error__ (msg))) | |
132 | #else | |
133 | # define __warndecl(name, msg) extern void name (void) | |
134 | # define __warnattr(msg) | |
135 | # define __errordecl(name, msg) extern void name (void) | |
136 | #endif | |
137 | ||
138 | /* Support for flexible arrays. | |
139 | Headers that should use flexible arrays only if they're "real" | |
140 | (e.g. only if they won't affect sizeof()) should test | |
141 | #if __glibc_c99_flexarr_available. */ | |
142 | #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc | |
143 | # define __flexarr [] | |
144 | # define __glibc_c99_flexarr_available 1 | |
145 | #elif __GNUC_PREREQ (2,97) | |
146 | /* GCC 2.97 supports C99 flexible array members as an extension, | |
147 | even when in C89 mode or compiling C++ (any version). */ | |
148 | # define __flexarr [] | |
149 | # define __glibc_c99_flexarr_available 1 | |
150 | #elif defined __GNUC__ | |
151 | /* Pre-2.97 GCC did not support C99 flexible arrays but did have | |
152 | an equivalent extension with slightly different notation. */ | |
153 | # define __flexarr [0] | |
154 | # define __glibc_c99_flexarr_available 1 | |
155 | #else | |
156 | /* Some other non-C99 compiler. Approximate with [1]. */ | |
157 | # define __flexarr [1] | |
158 | # define __glibc_c99_flexarr_available 0 | |
159 | #endif | |
160 | ||
161 | ||
162 | /* __asm__ ("xyz") is used throughout the headers to rename functions | |
163 | at the assembly language level. This is wrapped by the __REDIRECT | |
164 | macro, in order to support compilers that can do this some other | |
165 | way. When compilers don't support asm-names at all, we have to do | |
166 | preprocessor tricks instead (which don't have exactly the right | |
167 | semantics, but it's the best we can do). | |
168 | ||
169 | Example: | |
170 | int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ | |
171 | ||
172 | #if defined __GNUC__ && __GNUC__ >= 2 | |
173 | ||
174 | # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) | |
175 | # ifdef __cplusplus | |
176 | # define __REDIRECT_NTH(name, proto, alias) \ | |
177 | name proto __THROW __asm__ (__ASMNAME (#alias)) | |
178 | # define __REDIRECT_NTHNL(name, proto, alias) \ | |
179 | name proto __THROWNL __asm__ (__ASMNAME (#alias)) | |
180 | # else | |
181 | # define __REDIRECT_NTH(name, proto, alias) \ | |
182 | name proto __asm__ (__ASMNAME (#alias)) __THROW | |
183 | # define __REDIRECT_NTHNL(name, proto, alias) \ | |
184 | name proto __asm__ (__ASMNAME (#alias)) __THROWNL | |
185 | # endif | |
186 | # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) | |
187 | # define __ASMNAME2(prefix, cname) __STRING (prefix) cname | |
188 | ||
189 | /* | |
190 | #elif __SOME_OTHER_COMPILER__ | |
191 | ||
192 | # define __REDIRECT(name, proto, alias) name proto; \ | |
193 | _Pragma("let " #name " = " #alias) | |
194 | */ | |
195 | #endif | |
196 | ||
197 | /* GCC has various useful declarations that can be made with the | |
198 | `__attribute__' syntax. All of the ways we use this do fine if | |
199 | they are omitted for compilers that don't understand it. */ | |
200 | #if !defined __GNUC__ || __GNUC__ < 2 | |
201 | # define __attribute__(xyz) /* Ignore */ | |
202 | #endif | |
203 | ||
204 | /* At some point during the gcc 2.96 development the `malloc' attribute | |
205 | for functions was introduced. We don't want to use it unconditionally | |
206 | (although this would be possible) since it generates warnings. */ | |
207 | #if __GNUC_PREREQ (2,96) | |
208 | # define __attribute_malloc__ __attribute__ ((__malloc__)) | |
209 | #else | |
210 | # define __attribute_malloc__ /* Ignore */ | |
211 | #endif | |
212 | ||
213 | /* Tell the compiler which arguments to an allocation function | |
214 | indicate the size of the allocation. */ | |
215 | #if __GNUC_PREREQ (4, 3) | |
216 | # define __attribute_alloc_size__(params) \ | |
217 | __attribute__ ((__alloc_size__ params)) | |
218 | #else | |
219 | # define __attribute_alloc_size__(params) /* Ignore. */ | |
220 | #endif | |
221 | ||
222 | /* At some point during the gcc 2.96 development the `pure' attribute | |
223 | for functions was introduced. We don't want to use it unconditionally | |
224 | (although this would be possible) since it generates warnings. */ | |
225 | #if __GNUC_PREREQ (2,96) | |
226 | # define __attribute_pure__ __attribute__ ((__pure__)) | |
227 | #else | |
228 | # define __attribute_pure__ /* Ignore */ | |
229 | #endif | |
230 | ||
231 | /* This declaration tells the compiler that the value is constant. */ | |
232 | #if __GNUC_PREREQ (2,5) | |
233 | # define __attribute_const__ __attribute__ ((__const__)) | |
234 | #else | |
235 | # define __attribute_const__ /* Ignore */ | |
236 | #endif | |
237 | ||
238 | /* At some point during the gcc 3.1 development the `used' attribute | |
239 | for functions was introduced. We don't want to use it unconditionally | |
240 | (although this would be possible) since it generates warnings. */ | |
241 | #if __GNUC_PREREQ (3,1) | |
242 | # define __attribute_used__ __attribute__ ((__used__)) | |
243 | # define __attribute_noinline__ __attribute__ ((__noinline__)) | |
244 | #else | |
245 | # define __attribute_used__ __attribute__ ((__unused__)) | |
246 | # define __attribute_noinline__ /* Ignore */ | |
247 | #endif | |
248 | ||
249 | /* Since version 3.2, gcc allows marking deprecated functions. */ | |
250 | #if __GNUC_PREREQ (3,2) | |
251 | # define __attribute_deprecated__ __attribute__ ((__deprecated__)) | |
252 | #else | |
253 | # define __attribute_deprecated__ /* Ignore */ | |
254 | #endif | |
255 | ||
256 | /* Since version 4.5, gcc also allows one to specify the message printed | |
257 | when a deprecated function is used. clang claims to be gcc 4.2, but | |
258 | may also support this feature. */ | |
259 | #if __GNUC_PREREQ (4,5) || \ | |
260 | __glibc_clang_has_extension (__attribute_deprecated_with_message__) | |
261 | # define __attribute_deprecated_msg__(msg) \ | |
262 | __attribute__ ((__deprecated__ (msg))) | |
263 | #else | |
264 | # define __attribute_deprecated_msg__(msg) __attribute_deprecated__ | |
265 | #endif | |
266 | ||
267 | /* At some point during the gcc 2.8 development the `format_arg' attribute | |
268 | for functions was introduced. We don't want to use it unconditionally | |
269 | (although this would be possible) since it generates warnings. | |
270 | If several `format_arg' attributes are given for the same function, in | |
271 | gcc-3.0 and older, all but the last one are ignored. In newer gccs, | |
272 | all designated arguments are considered. */ | |
273 | #if __GNUC_PREREQ (2,8) | |
274 | # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) | |
275 | #else | |
276 | # define __attribute_format_arg__(x) /* Ignore */ | |
277 | #endif | |
278 | ||
279 | /* At some point during the gcc 2.97 development the `strfmon' format | |
280 | attribute for functions was introduced. We don't want to use it | |
281 | unconditionally (although this would be possible) since it | |
282 | generates warnings. */ | |
283 | #if __GNUC_PREREQ (2,97) | |
284 | # define __attribute_format_strfmon__(a,b) \ | |
285 | __attribute__ ((__format__ (__strfmon__, a, b))) | |
286 | #else | |
287 | # define __attribute_format_strfmon__(a,b) /* Ignore */ | |
288 | #endif | |
289 | ||
290 | /* The nonnull function attribute marks pointer parameters that | |
291 | must not be NULL. Do not define __nonnull if it is already defined, | |
292 | for portability when this file is used in Gnulib. */ | |
293 | #ifndef __nonnull | |
294 | # if __GNUC_PREREQ (3,3) | |
295 | # define __nonnull(params) __attribute__ ((__nonnull__ params)) | |
296 | # else | |
297 | # define __nonnull(params) | |
298 | # endif | |
299 | #endif | |
300 | ||
301 | /* If fortification mode, we warn about unused results of certain | |
302 | function calls which can lead to problems. */ | |
303 | #if __GNUC_PREREQ (3,4) | |
304 | # define __attribute_warn_unused_result__ \ | |
305 | __attribute__ ((__warn_unused_result__)) | |
306 | # if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0 | |
307 | # define __wur __attribute_warn_unused_result__ | |
308 | # endif | |
309 | #else | |
310 | # define __attribute_warn_unused_result__ /* empty */ | |
311 | #endif | |
312 | #ifndef __wur | |
313 | # define __wur /* Ignore */ | |
314 | #endif | |
315 | ||
316 | /* Forces a function to be always inlined. */ | |
317 | #if __GNUC_PREREQ (3,2) | |
318 | /* The Linux kernel defines __always_inline in stddef.h (283d7573), and | |
319 | it conflicts with this definition. Therefore undefine it first to | |
320 | allow either header to be included first. */ | |
321 | # undef __always_inline | |
322 | # define __always_inline __inline __attribute__ ((__always_inline__)) | |
323 | #else | |
324 | # undef __always_inline | |
325 | # define __always_inline __inline | |
326 | #endif | |
327 | ||
328 | /* Associate error messages with the source location of the call site rather | |
329 | than with the source location inside the function. */ | |
330 | #if __GNUC_PREREQ (4,3) | |
331 | # define __attribute_artificial__ __attribute__ ((__artificial__)) | |
332 | #else | |
333 | # define __attribute_artificial__ /* Ignore */ | |
334 | #endif | |
335 | ||
336 | /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99 | |
337 | inline semantics, unless -fgnu89-inline is used. Using __GNUC_STDC_INLINE__ | |
338 | or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions | |
339 | older than 4.3 may define these macros and still not guarantee GNU inlining | |
340 | semantics. | |
341 | ||
342 | clang++ identifies itself as gcc-4.2, but has support for GNU inlining | |
343 | semantics, that can be checked for by using the __GNUC_STDC_INLINE_ and | |
344 | __GNUC_GNU_INLINE__ macro definitions. */ | |
345 | #if (!defined __cplusplus || __GNUC_PREREQ (4,3) \ | |
346 | || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \ | |
347 | || defined __GNUC_GNU_INLINE__))) | |
348 | # if defined __GNUC_STDC_INLINE__ || defined __cplusplus | |
349 | # define __extern_inline extern __inline __attribute__ ((__gnu_inline__)) | |
350 | # define __extern_always_inline \ | |
351 | extern __always_inline __attribute__ ((__gnu_inline__)) | |
352 | # else | |
353 | # define __extern_inline extern __inline | |
354 | # define __extern_always_inline extern __always_inline | |
355 | # endif | |
356 | #endif | |
357 | ||
358 | #ifdef __extern_always_inline | |
359 | # define __fortify_function __extern_always_inline __attribute_artificial__ | |
360 | #endif | |
361 | ||
362 | /* GCC 4.3 and above allow passing all anonymous arguments of an | |
363 | __extern_always_inline function to some other vararg function. */ | |
364 | #if __GNUC_PREREQ (4,3) | |
365 | # define __va_arg_pack() __builtin_va_arg_pack () | |
366 | # define __va_arg_pack_len() __builtin_va_arg_pack_len () | |
367 | #endif | |
368 | ||
369 | /* It is possible to compile containing GCC extensions even if GCC is | |
370 | run in pedantic mode if the uses are carefully marked using the | |
371 | `__extension__' keyword. But this is not generally available before | |
372 | version 2.8. */ | |
373 | #if !__GNUC_PREREQ (2,8) | |
374 | # define __extension__ /* Ignore */ | |
375 | #endif | |
376 | ||
377 | /* __restrict is known in EGCS 1.2 and above. */ | |
378 | #if !__GNUC_PREREQ (2,92) | |
379 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L | |
380 | # define __restrict restrict | |
381 | # else | |
382 | # define __restrict /* Ignore */ | |
383 | # endif | |
384 | #endif | |
385 | ||
386 | /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is | |
387 | array_name[restrict] | |
388 | GCC 3.1 supports this. */ | |
389 | #if __GNUC_PREREQ (3,1) && !defined __GNUG__ | |
390 | # define __restrict_arr __restrict | |
391 | #else | |
392 | # ifdef __GNUC__ | |
393 | # define __restrict_arr /* Not supported in old GCC. */ | |
394 | # else | |
395 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L | |
396 | # define __restrict_arr restrict | |
397 | # else | |
398 | /* Some other non-C99 compiler. */ | |
399 | # define __restrict_arr /* Not supported. */ | |
400 | # endif | |
401 | # endif | |
402 | #endif | |
403 | ||
404 | #if __GNUC__ >= 3 | |
405 | # define __glibc_unlikely(cond) __builtin_expect ((cond), 0) | |
406 | # define __glibc_likely(cond) __builtin_expect ((cond), 1) | |
407 | #else | |
408 | # define __glibc_unlikely(cond) (cond) | |
409 | # define __glibc_likely(cond) (cond) | |
410 | #endif | |
411 | ||
412 | #ifdef __has_attribute | |
413 | # define __glibc_has_attribute(attr) __has_attribute (attr) | |
414 | #else | |
415 | # define __glibc_has_attribute(attr) 0 | |
416 | #endif | |
417 | ||
418 | #if (!defined _Noreturn \ | |
419 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ | |
420 | && !__GNUC_PREREQ (4,7)) | |
421 | # if __GNUC_PREREQ (2,8) | |
422 | # define _Noreturn __attribute__ ((__noreturn__)) | |
423 | # else | |
424 | # define _Noreturn | |
425 | # endif | |
426 | #endif | |
427 | ||
428 | #if __GNUC_PREREQ (8, 0) | |
429 | /* Describes a char array whose address can safely be passed as the first | |
430 | argument to strncpy and strncat, as the char array is not necessarily | |
431 | a NUL-terminated string. */ | |
432 | # define __attribute_nonstring__ __attribute__ ((__nonstring__)) | |
433 | #else | |
434 | # define __attribute_nonstring__ | |
435 | #endif | |
436 | ||
437 | #if (!defined _Static_assert && !defined __cplusplus \ | |
438 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ | |
439 | && (!__GNUC_PREREQ (4, 6) || defined __STRICT_ANSI__)) | |
440 | # define _Static_assert(expr, diagnostic) \ | |
441 | extern int (*__Static_assert_function (void)) \ | |
442 | [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })] | |
443 | #endif | |
444 | ||
445 | /* The #ifndef lets Gnulib avoid including these on non-glibc | |
446 | platforms, where the includes typically do not exist. */ | |
447 | #ifndef __WORDSIZE | |
448 | # include <bits/wordsize.h> | |
449 | # include <bits/long-double.h> | |
450 | #endif | |
451 | ||
452 | #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH | |
453 | # define __LDBL_COMPAT 1 | |
454 | # ifdef __REDIRECT | |
455 | # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias) | |
456 | # define __LDBL_REDIR(name, proto) \ | |
457 | __LDBL_REDIR1 (name, proto, __nldbl_##name) | |
458 | # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias) | |
459 | # define __LDBL_REDIR_NTH(name, proto) \ | |
460 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##name) | |
461 | # define __LDBL_REDIR1_DECL(name, alias) \ | |
462 | extern __typeof (name) name __asm (__ASMNAME (#alias)); | |
463 | # define __LDBL_REDIR_DECL(name) \ | |
464 | extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name)); | |
465 | # define __REDIRECT_LDBL(name, proto, alias) \ | |
466 | __LDBL_REDIR1 (name, proto, __nldbl_##alias) | |
467 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ | |
468 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias) | |
469 | # endif | |
470 | #endif | |
471 | #if !defined __LDBL_COMPAT || !defined __REDIRECT | |
472 | # define __LDBL_REDIR1(name, proto, alias) name proto | |
473 | # define __LDBL_REDIR(name, proto) name proto | |
474 | # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW | |
475 | # define __LDBL_REDIR_NTH(name, proto) name proto __THROW | |
476 | # define __LDBL_REDIR_DECL(name) | |
477 | # ifdef __REDIRECT | |
478 | # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias) | |
479 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ | |
480 | __REDIRECT_NTH (name, proto, alias) | |
481 | # endif | |
482 | #endif | |
483 | ||
484 | /* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is | |
485 | intended for use in preprocessor macros. | |
486 | ||
487 | Note: MESSAGE must be a _single_ string; concatenation of string | |
488 | literals is not supported. */ | |
489 | #if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5) | |
490 | # define __glibc_macro_warning1(message) _Pragma (#message) | |
491 | # define __glibc_macro_warning(message) \ | |
492 | __glibc_macro_warning1 (GCC warning message) | |
493 | #else | |
494 | # define __glibc_macro_warning(msg) | |
495 | #endif | |
496 | ||
497 | /* Generic selection (ISO C11) is a C-only feature, available in GCC | |
498 | since version 4.9. Previous versions do not provide generic | |
499 | selection, even though they might set __STDC_VERSION__ to 201112L, | |
500 | when in -std=c11 mode. Thus, we must check for !defined __GNUC__ | |
501 | when testing __STDC_VERSION__ for generic selection support. | |
502 | On the other hand, Clang also defines __GNUC__, so a clang-specific | |
503 | check is required to enable the use of generic selection. */ | |
504 | #if !defined __cplusplus \ | |
505 | && (__GNUC_PREREQ (4, 9) \ | |
506 | || __glibc_clang_has_extension (c_generic_selections) \ | |
507 | || (!defined __GNUC__ && defined __STDC_VERSION__ \ | |
508 | && __STDC_VERSION__ >= 201112L)) | |
509 | # define __HAVE_GENERIC_SELECTION 1 | |
510 | #else | |
511 | # define __HAVE_GENERIC_SELECTION 0 | |
512 | #endif | |
513 | ||
514 | #endif /* sys/cdefs.h */ |