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dff8da6b | 1 | /* Copyright (C) 1992-2024 Free Software Foundation, Inc. |
8a9a5931 | 2 | Copyright The GNU Toolchain Authors. |
54d79e99 | 3 | This file is part of the GNU C Library. |
28f540f4 | 4 | |
54d79e99 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 9 | |
54d79e99 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
28f540f4 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
28f540f4 RM |
18 | |
19 | #ifndef _SYS_CDEFS_H | |
28f540f4 | 20 | #define _SYS_CDEFS_H 1 |
5107cf1d | 21 | |
a6ff34d7 UD |
22 | /* We are almost always included from features.h. */ |
23 | #ifndef _FEATURES_H | |
7688db91 UD |
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 | |
2ea6af74 | 29 | supported anymore. */ |
21244c70 JW |
30 | #if defined __GNUC__ && !defined __STDC__ && !defined __cplusplus |
31 | # error "You need a ISO C or C++ conforming compiler to use the glibc headers" | |
a6ff34d7 | 32 | #endif |
28f540f4 RM |
33 | |
34 | /* Some user header file might have defined this before. */ | |
35 | #undef __P | |
d112ae30 | 36 | #undef __PMT |
28f540f4 | 37 | |
c8ba52ab AZ |
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__ | |
28f540f4 | 61 | |
3871f58f AS |
62 | /* All functions, except those with callbacks or those that |
63 | synchronize memory, are leaf functions. */ | |
aa78043a UD |
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 | ||
dff14448 | 72 | /* GCC can always grok prototypes. For C++ programs we add throw() |
2ea6af74 | 73 | to help it optimize the function calls. But this only works with |
c8ba52ab | 74 | gcc 2.8.x and egcs. For gcc 3.4 and up we even mark C functions |
f377d022 UD |
75 | as non-throwing using a function attribute since programs can use |
76 | the -fexceptions options for C code as well. */ | |
c8ba52ab AZ |
77 | # if !defined __cplusplus \ |
78 | && (__GNUC_PREREQ (3, 4) || __glibc_has_attribute (__nothrow__)) | |
49a43d80 | 79 | # define __THROW __attribute__ ((__nothrow__ __LEAF)) |
3871f58f | 80 | # define __THROWNL __attribute__ ((__nothrow__)) |
49a43d80 | 81 | # define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) fct |
7c3018f9 | 82 | # define __NTHNL(fct) __attribute__ ((__nothrow__)) fct |
dff14448 | 83 | # else |
7999b8a3 | 84 | # if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major__ >= 4) |
d445d9ca JW |
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 | |
f377d022 UD |
93 | # else |
94 | # define __THROW | |
3871f58f | 95 | # define __THROWNL |
f377d022 | 96 | # define __NTH(fct) fct |
7c3018f9 | 97 | # define __NTHNL(fct) fct |
f377d022 | 98 | # endif |
dff14448 | 99 | # endif |
4360eafd | 100 | |
0ab341b2 SB |
101 | # if __GNUC_PREREQ (4, 3) || __glibc_has_attribute (__cold__) |
102 | # define __COLD __attribute__ ((__cold__)) | |
103 | # else | |
104 | # define __COLD | |
105 | # endif | |
106 | ||
c8ba52ab | 107 | #else /* Not GCC or clang. */ |
28f540f4 | 108 | |
383e87c9 JM |
109 | # if (defined __cplusplus \ |
110 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) | |
111 | # define __inline inline | |
112 | # else | |
113 | # define __inline /* No inline functions. */ | |
114 | # endif | |
28f540f4 | 115 | |
9b767d19 | 116 | # define __THROW |
3871f58f | 117 | # define __THROWNL |
f377d022 | 118 | # define __NTH(fct) fct |
0ab341b2 | 119 | # define __COLD |
28f540f4 | 120 | |
c8ba52ab | 121 | #endif /* GCC || clang. */ |
cab4d74b | 122 | |
d19687d6 UD |
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 | |
127 | ||
28f540f4 RM |
128 | /* For these things, GCC behaves the ANSI way normally, |
129 | and the non-ANSI way under -traditional. */ | |
130 | ||
7f4e0e58 UD |
131 | #define __CONCAT(x,y) x ## y |
132 | #define __STRING(x) #x | |
28f540f4 RM |
133 | |
134 | /* This is not a typedef so `const __ptr_t' does the right thing. */ | |
7f4e0e58 | 135 | #define __ptr_t void * |
857fa1b8 RM |
136 | |
137 | ||
28f540f4 RM |
138 | /* C++ needs to know that types and declarations are C, not C++. */ |
139 | #ifdef __cplusplus | |
dfd2257a UD |
140 | # define __BEGIN_DECLS extern "C" { |
141 | # define __END_DECLS } | |
28f540f4 | 142 | #else |
dfd2257a UD |
143 | # define __BEGIN_DECLS |
144 | # define __END_DECLS | |
28f540f4 RM |
145 | #endif |
146 | ||
ab95290c | 147 | |
7a709361 AZ |
148 | /* The overloadable attribute was added on clang 2.6. */ |
149 | #if defined __clang_major__ \ | |
150 | && (__clang_major__ + (__clang_minor__ >= 6) > 2) | |
151 | # define __attribute_overloadable__ __attribute__((__overloadable__)) | |
152 | #else | |
153 | # define __attribute_overloadable__ | |
154 | #endif | |
155 | ||
b5cc329c UD |
156 | /* Fortify support. */ |
157 | #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1) | |
158 | #define __bos0(ptr) __builtin_object_size (ptr, 0) | |
159 | ||
c43c5796 | 160 | /* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available. */ |
86bf0feb SP |
161 | #if __USE_FORTIFY_LEVEL == 3 && (__glibc_clang_prereq (9, 0) \ |
162 | || __GNUC_PREREQ (12, 0)) | |
c43c5796 SP |
163 | # define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0) |
164 | # define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1) | |
165 | #else | |
166 | # define __glibc_objsize0(__o) __bos0 (__o) | |
167 | # define __glibc_objsize(__o) __bos (__o) | |
168 | #endif | |
169 | ||
2337e04e | 170 | #if __USE_FORTIFY_LEVEL > 0 |
a643f60c SP |
171 | /* Compile time conditions to choose between the regular, _chk and _chk_warn |
172 | variants. These conditions should get evaluated to constant and optimized | |
173 | away. */ | |
174 | ||
175 | #define __glibc_safe_len_cond(__l, __s, __osz) ((__l) <= (__osz) / (__s)) | |
176 | #define __glibc_unsigned_or_positive(__l) \ | |
177 | ((__typeof (__l)) 0 < (__typeof (__l)) -1 \ | |
178 | || (__builtin_constant_p (__l) && (__l) > 0)) | |
179 | ||
180 | /* Length is known to be safe at compile time if the __L * __S <= __OBJSZ | |
33e03f9c | 181 | condition can be folded to a constant and if it is true, or unknown (-1) */ |
a643f60c | 182 | #define __glibc_safe_or_unknown_len(__l, __s, __osz) \ |
61a87530 | 183 | ((__builtin_constant_p (__osz) && (__osz) == (__SIZE_TYPE__) -1) \ |
33e03f9c JB |
184 | || (__glibc_unsigned_or_positive (__l) \ |
185 | && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \ | |
186 | (__s), (__osz))) \ | |
187 | && __glibc_safe_len_cond ((__SIZE_TYPE__) (__l), (__s), (__osz)))) | |
a643f60c | 188 | |
ae23fa3e | 189 | /* Conversely, we know at compile time that the length is unsafe if the |
a643f60c SP |
190 | __L * __S <= __OBJSZ condition can be folded to a constant and if it is |
191 | false. */ | |
192 | #define __glibc_unsafe_len(__l, __s, __osz) \ | |
193 | (__glibc_unsigned_or_positive (__l) \ | |
194 | && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \ | |
195 | __s, __osz)) \ | |
196 | && !__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), __s, __osz)) | |
197 | ||
7a709361 AZ |
198 | /* To correctly instrument the fortify wrapper clang requires the |
199 | pass_object_size attribute, and the attribute has the restriction that the | |
200 | argument needs to be 'const'. Furthermore, to make it usable with C | |
201 | interfaces, clang provides the overload attribute, which provides a C++ | |
202 | like function overload support. The overloaded fortify wrapper with the | |
203 | pass_object_size attribute has precedence over the default symbol. | |
204 | ||
205 | Also, clang does not support __va_arg_pack, so variadic functions are | |
206 | expanded to issue va_arg implementations. The error function must not have | |
207 | bodies (address takes are expanded to nonfortified calls), and with | |
208 | __fortify_function compiler might still create a body with the C++ | |
209 | mangling name (due to the overload attribute). In this case, the function | |
210 | is defined with __fortify_function_error_function macro instead. | |
211 | ||
212 | The argument size check is also done with a clang-only attribute, | |
213 | __attribute__ ((__diagnose_if__ (...))), different than gcc which calls | |
214 | symbol_chk_warn alias with uses __warnattr attribute. | |
215 | ||
216 | The pass_object_size was added on clang 4.0, __diagnose_if__ on 5.0, | |
217 | and pass_dynamic_object_size on 9.0. */ | |
218 | #if defined __clang_major__ && __clang_major__ >= 5 | |
219 | # define __fortify_use_clang 1 | |
220 | ||
221 | # define __fortify_function_error_function static __attribute__((__unused__)) | |
222 | ||
223 | # define __fortify_clang_pass_object_size_n(n) \ | |
224 | __attribute__ ((__pass_object_size__ (n))) | |
225 | # define __fortify_clang_pass_object_size0 \ | |
226 | __fortify_clang_pass_object_size_n (0) | |
227 | # define __fortify_clang_pass_object_size \ | |
228 | __fortify_clang_pass_object_size_n (__USE_FORTIFY_LEVEL > 1) | |
229 | ||
230 | # if __clang_major__ >= 9 | |
231 | # define __fortify_clang_pass_dynamic_object_size_n(n) \ | |
232 | __attribute__ ((__pass_dynamic_object_size__ (n))) | |
233 | # define __fortify_clang_pass_dynamic_object_size0 \ | |
234 | __fortify_clang_pass_dynamic_object_size_n (0) | |
235 | # define __fortify_clang_pass_dynamic_object_size \ | |
236 | __fortify_clang_pass_dynamic_object_size_n (1) | |
237 | # else | |
238 | # define __fortify_clang_pass_dynamic_object_size_n(n) | |
239 | # define __fortify_clang_pass_dynamic_object_size0 | |
240 | # define __fortify_clang_pass_dynamic_object_size | |
241 | # endif | |
242 | ||
243 | # define __fortify_clang_bos_static_lt_impl(bos_val, n, s) \ | |
244 | ((bos_val) != -1ULL && (n) > (bos_val) / (s)) | |
245 | # define __fortify_clang_bos_static_lt2(__n, __e, __s) \ | |
246 | __fortify_clang_bos_static_lt_impl (__bos (__e), __n, __s) | |
247 | # define __fortify_clang_bos_static_lt(__n, __e) \ | |
248 | __fortify_clang_bos_static_lt2 (__n, __e, 1) | |
249 | # define __fortify_clang_bos0_static_lt2(__n, __e, __s) \ | |
250 | __fortify_clang_bos_static_lt_impl (__bos0 (__e), __n, __s) | |
251 | # define __fortify_clang_bos0_static_lt(__n, __e) \ | |
252 | __fortify_clang_bos0_static_lt2 (__n, __e, 1) | |
253 | ||
254 | # define __fortify_clang_bosn_args(bos_fn, n, buf, div, complaint) \ | |
255 | (__fortify_clang_bos_static_lt_impl (bos_fn (buf), n, div)), (complaint), \ | |
256 | "warning" | |
257 | ||
258 | # define __fortify_clang_warning(__c, __msg) \ | |
259 | __attribute__ ((__diagnose_if__ ((__c), (__msg), "warning"))) | |
86889e22 AZ |
260 | # define __fortify_clang_error(__c, __msg) \ |
261 | __attribute__ ((__diagnose_if__ ((__c), (__msg), "error"))) | |
262 | # define __fortify_clang_warning_only_if_bos0_lt(n, buf, complaint) \ | |
7a709361 AZ |
263 | __attribute__ ((__diagnose_if__ \ |
264 | (__fortify_clang_bosn_args (__bos0, n, buf, 1, complaint)))) | |
265 | # define __fortify_clang_warning_only_if_bos0_lt2(n, buf, div, complaint) \ | |
266 | __attribute__ ((__diagnose_if__ \ | |
267 | (__fortify_clang_bosn_args (__bos0, n, buf, div, complaint)))) | |
268 | # define __fortify_clang_warning_only_if_bos_lt(n, buf, complaint) \ | |
269 | __attribute__ ((__diagnose_if__ \ | |
270 | (__fortify_clang_bosn_args (__bos, n, buf, 1, complaint)))) | |
271 | # define __fortify_clang_warning_only_if_bos_lt2(n, buf, div, complaint) \ | |
272 | __attribute__ ((__diagnose_if__ \ | |
273 | (__fortify_clang_bosn_args (__bos, n, buf, div, complaint)))) | |
274 | ||
86889e22 AZ |
275 | # define __fortify_clang_prefer_this_overload \ |
276 | __attribute__ ((enable_if (1, ""))) | |
277 | # define __fortify_clang_unavailable(__msg) \ | |
278 | __attribute__ ((unavailable(__msg))) | |
279 | ||
7a709361 AZ |
280 | # if __USE_FORTIFY_LEVEL == 3 |
281 | # define __fortify_clang_overload_arg(__type, __attr, __name) \ | |
282 | __type __attr const __fortify_clang_pass_dynamic_object_size __name | |
283 | # define __fortify_clang_overload_arg0(__type, __attr, __name) \ | |
284 | __type __attr const __fortify_clang_pass_dynamic_object_size0 __name | |
285 | # else | |
286 | # define __fortify_clang_overload_arg(__type, __attr, __name) \ | |
287 | __type __attr const __fortify_clang_pass_object_size __name | |
288 | # define __fortify_clang_overload_arg0(__type, __attr, __name) \ | |
289 | __type __attr const __fortify_clang_pass_object_size0 __name | |
290 | # endif | |
291 | ||
292 | # define __fortify_clang_mul_may_overflow(size, n) \ | |
293 | ((size | n) >= (((size_t)1) << (8 * sizeof (size_t) / 2))) | |
294 | ||
295 | # define __fortify_clang_size_too_small(__bos, __dest, __len) \ | |
296 | (__bos (__dest) != (size_t) -1 && __bos (__dest) < __len) | |
297 | # define __fortify_clang_warn_if_src_too_large(__dest, __src) \ | |
298 | __fortify_clang_warning (__fortify_clang_size_too_small (__glibc_objsize, \ | |
299 | __dest, \ | |
300 | __builtin_strlen (__src) + 1), \ | |
301 | "destination buffer will always be overflown by source") | |
302 | # define __fortify_clang_warn_if_dest_too_small(__dest, __len) \ | |
303 | __fortify_clang_warning (__fortify_clang_size_too_small (__glibc_objsize, \ | |
304 | __dest, \ | |
305 | __len), \ | |
306 | "function called with bigger length than the destination buffer") | |
307 | # define __fortify_clang_warn_if_dest_too_small0(__dest, __len) \ | |
308 | __fortify_clang_warning (__fortify_clang_size_too_small (__glibc_objsize0, \ | |
309 | __dest, \ | |
310 | __len), \ | |
311 | "function called with bigger length than the destination buffer") | |
312 | #else | |
313 | # define __fortify_use_clang 0 | |
314 | # define __fortify_clang_warning(__c, __msg) | |
315 | # define __fortify_clang_warning_only_if_bos0_lt(__n, __buf, __complaint) | |
316 | # define __fortify_clang_warning_only_if_bos0_lt2(__n, __buf, __div, complaint) | |
317 | # define __fortify_clang_warning_only_if_bos_lt(__n, __buf, __complaint) | |
318 | # define __fortify_clang_warning_only_if_bos_lt2(__n, __buf, div, __complaint) | |
319 | # define __fortify_clang_overload_arg(__type, __attr, __name) \ | |
320 | __type __attr __name | |
321 | # define __fortify_clang_overload_arg0(__type, __attr, __name) \ | |
322 | __fortify_clang_overload_arg (__type, __attr, __name) | |
323 | # define __fortify_clang_warn_if_src_too_large(__dest, __src) | |
324 | # define __fortify_clang_warn_if_dest_too_small(__dest, __len) | |
325 | # define __fortify_clang_warn_if_dest_too_small0(__dest, __len) | |
326 | #endif | |
327 | ||
328 | ||
a643f60c SP |
329 | /* Fortify function f. __f_alias, __f_chk and __f_chk_warn must be |
330 | declared. */ | |
331 | ||
7a709361 AZ |
332 | #if !__fortify_use_clang |
333 | # define __glibc_fortify(f, __l, __s, __osz, ...) \ | |
a643f60c SP |
334 | (__glibc_safe_or_unknown_len (__l, __s, __osz) \ |
335 | ? __ ## f ## _alias (__VA_ARGS__) \ | |
336 | : (__glibc_unsafe_len (__l, __s, __osz) \ | |
337 | ? __ ## f ## _chk_warn (__VA_ARGS__, __osz) \ | |
2337e04e | 338 | : __ ## f ## _chk (__VA_ARGS__, __osz))) |
7a709361 AZ |
339 | #else |
340 | # define __glibc_fortify(f, __l, __s, __osz, ...) \ | |
341 | (__osz == (__SIZE_TYPE__) -1) \ | |
342 | ? __ ## f ## _alias (__VA_ARGS__) \ | |
343 | : __ ## f ## _chk (__VA_ARGS__, __osz) | |
344 | #endif | |
a643f60c SP |
345 | |
346 | /* Fortify function f, where object size argument passed to f is the number of | |
347 | elements and not total size. */ | |
348 | ||
7a709361 AZ |
349 | #if !__fortify_use_clang |
350 | # define __glibc_fortify_n(f, __l, __s, __osz, ...) \ | |
a643f60c SP |
351 | (__glibc_safe_or_unknown_len (__l, __s, __osz) \ |
352 | ? __ ## f ## _alias (__VA_ARGS__) \ | |
353 | : (__glibc_unsafe_len (__l, __s, __osz) \ | |
354 | ? __ ## f ## _chk_warn (__VA_ARGS__, (__osz) / (__s)) \ | |
2337e04e | 355 | : __ ## f ## _chk (__VA_ARGS__, (__osz) / (__s)))) |
7a709361 AZ |
356 | # else |
357 | # define __glibc_fortify_n(f, __l, __s, __osz, ...) \ | |
358 | (__osz == (__SIZE_TYPE__) -1) \ | |
359 | ? __ ## f ## _alias (__VA_ARGS__) \ | |
360 | : __ ## f ## _chk (__VA_ARGS__, (__osz) / (__s)) | |
2337e04e | 361 | #endif |
a643f60c | 362 | |
7a709361 AZ |
363 | #endif /* __USE_FORTIFY_LEVEL > 0 */ |
364 | ||
d6cd6bf4 | 365 | #if __GNUC_PREREQ (4,3) |
d6cd6bf4 UD |
366 | # define __warnattr(msg) __attribute__((__warning__ (msg))) |
367 | # define __errordecl(name, msg) \ | |
368 | extern void name (void) __attribute__((__error__ (msg))) | |
369 | #else | |
d6cd6bf4 UD |
370 | # define __warnattr(msg) |
371 | # define __errordecl(name, msg) extern void name (void) | |
372 | #endif | |
b5cc329c | 373 | |
cb765808 ZW |
374 | /* Support for flexible arrays. |
375 | Headers that should use flexible arrays only if they're "real" | |
376 | (e.g. only if they won't affect sizeof()) should test | |
377 | #if __glibc_c99_flexarr_available. */ | |
c8ba52ab | 378 | #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc |
a1620a4c | 379 | # define __flexarr [] |
cb765808 | 380 | # define __glibc_c99_flexarr_available 1 |
c8ba52ab AZ |
381 | #elif __GNUC_PREREQ (2,97) || defined __clang__ |
382 | /* GCC 2.97 and clang support C99 flexible array members as an extension, | |
cb765808 ZW |
383 | even when in C89 mode or compiling C++ (any version). */ |
384 | # define __flexarr [] | |
385 | # define __glibc_c99_flexarr_available 1 | |
386 | #elif defined __GNUC__ | |
387 | /* Pre-2.97 GCC did not support C99 flexible arrays but did have | |
388 | an equivalent extension with slightly different notation. */ | |
389 | # define __flexarr [0] | |
390 | # define __glibc_c99_flexarr_available 1 | |
a1620a4c | 391 | #else |
a1620a4c | 392 | /* Some other non-C99 compiler. Approximate with [1]. */ |
cb765808 ZW |
393 | # define __flexarr [1] |
394 | # define __glibc_c99_flexarr_available 0 | |
a1620a4c UD |
395 | #endif |
396 | ||
397 | ||
01cad722 UD |
398 | /* __asm__ ("xyz") is used throughout the headers to rename functions |
399 | at the assembly language level. This is wrapped by the __REDIRECT | |
400 | macro, in order to support compilers that can do this some other | |
401 | way. When compilers don't support asm-names at all, we have to do | |
402 | preprocessor tricks instead (which don't have exactly the right | |
403 | semantics, but it's the best we can do). | |
404 | ||
405 | Example: | |
fbedbe9d | 406 | int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ |
01cad722 | 407 | |
c8ba52ab | 408 | #if (defined __GNUC__ && __GNUC__ >= 2) || (__clang_major__ >= 4) |
01cad722 | 409 | |
5408c757 | 410 | # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) |
05f4d5cd UD |
411 | # ifdef __cplusplus |
412 | # define __REDIRECT_NTH(name, proto, alias) \ | |
413 | name proto __THROW __asm__ (__ASMNAME (#alias)) | |
edc5984d AS |
414 | # define __REDIRECT_NTHNL(name, proto, alias) \ |
415 | name proto __THROWNL __asm__ (__ASMNAME (#alias)) | |
05f4d5cd UD |
416 | # else |
417 | # define __REDIRECT_NTH(name, proto, alias) \ | |
f377d022 | 418 | name proto __asm__ (__ASMNAME (#alias)) __THROW |
edc5984d AS |
419 | # define __REDIRECT_NTHNL(name, proto, alias) \ |
420 | name proto __asm__ (__ASMNAME (#alias)) __THROWNL | |
05f4d5cd | 421 | # endif |
5408c757 UD |
422 | # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) |
423 | # define __ASMNAME2(prefix, cname) __STRING (prefix) cname | |
01cad722 | 424 | |
eea000f6 FB |
425 | #ifndef __REDIRECT_FORTIFY |
426 | #define __REDIRECT_FORTIFY __REDIRECT | |
427 | #endif | |
428 | ||
429 | #ifndef __REDIRECT_FORTIFY_NTH | |
430 | #define __REDIRECT_FORTIFY_NTH __REDIRECT_NTH | |
431 | #endif | |
432 | ||
01cad722 UD |
433 | /* |
434 | #elif __SOME_OTHER_COMPILER__ | |
435 | ||
5408c757 UD |
436 | # define __REDIRECT(name, proto, alias) name proto; \ |
437 | _Pragma("let " #name " = " #alias) | |
01cad722 UD |
438 | */ |
439 | #endif | |
440 | ||
c8ba52ab AZ |
441 | /* GCC and clang have various useful declarations that can be made with |
442 | the '__attribute__' syntax. All of the ways we use this do fine if | |
443 | they are omitted for compilers that don't understand it. */ | |
444 | #if !(defined __GNUC__ || defined __clang__) | |
e9e9b245 | 445 | # define __attribute__(xyz) /* Ignore */ |
ae177b9c UD |
446 | #endif |
447 | ||
e9e9b245 UD |
448 | /* At some point during the gcc 2.96 development the `malloc' attribute |
449 | for functions was introduced. We don't want to use it unconditionally | |
450 | (although this would be possible) since it generates warnings. */ | |
c8ba52ab | 451 | #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__malloc__) |
ae177b9c UD |
452 | # define __attribute_malloc__ __attribute__ ((__malloc__)) |
453 | #else | |
454 | # define __attribute_malloc__ /* Ignore */ | |
01cad722 | 455 | #endif |
2f6d1f1b | 456 | |
2f62b9ee MF |
457 | /* Tell the compiler which arguments to an allocation function |
458 | indicate the size of the allocation. */ | |
459 | #if __GNUC_PREREQ (4, 3) | |
460 | # define __attribute_alloc_size__(params) \ | |
461 | __attribute__ ((__alloc_size__ params)) | |
462 | #else | |
463 | # define __attribute_alloc_size__(params) /* Ignore. */ | |
464 | #endif | |
465 | ||
8a9a5931 JW |
466 | /* Tell the compiler which argument to an allocation function |
467 | indicates the alignment of the allocation. */ | |
468 | #if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__alloc_align__) | |
469 | # define __attribute_alloc_align__(param) \ | |
470 | __attribute__ ((__alloc_align__ param)) | |
471 | #else | |
472 | # define __attribute_alloc_align__(param) /* Ignore. */ | |
473 | #endif | |
474 | ||
ca5a4c3c AJ |
475 | /* At some point during the gcc 2.96 development the `pure' attribute |
476 | for functions was introduced. We don't want to use it unconditionally | |
477 | (although this would be possible) since it generates warnings. */ | |
c8ba52ab | 478 | #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__pure__) |
ca5a4c3c AJ |
479 | # define __attribute_pure__ __attribute__ ((__pure__)) |
480 | #else | |
481 | # define __attribute_pure__ /* Ignore */ | |
482 | #endif | |
483 | ||
295e904f | 484 | /* This declaration tells the compiler that the value is constant. */ |
c8ba52ab | 485 | #if __GNUC_PREREQ (2,5) || __glibc_has_attribute (__const__) |
295e904f MP |
486 | # define __attribute_const__ __attribute__ ((__const__)) |
487 | #else | |
488 | # define __attribute_const__ /* Ignore */ | |
489 | #endif | |
490 | ||
c8ba52ab AZ |
491 | #if __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__) |
492 | # define __attribute_maybe_unused__ __attribute__ ((__unused__)) | |
493 | #else | |
494 | # define __attribute_maybe_unused__ /* Ignore */ | |
495 | #endif | |
496 | ||
d3640b91 UD |
497 | /* At some point during the gcc 3.1 development the `used' attribute |
498 | for functions was introduced. We don't want to use it unconditionally | |
499 | (although this would be possible) since it generates warnings. */ | |
c8ba52ab | 500 | #if __GNUC_PREREQ (3,1) || __glibc_has_attribute (__used__) |
d3640b91 | 501 | # define __attribute_used__ __attribute__ ((__used__)) |
fb23eb25 | 502 | # define __attribute_noinline__ __attribute__ ((__noinline__)) |
d3640b91 UD |
503 | #else |
504 | # define __attribute_used__ __attribute__ ((__unused__)) | |
fb23eb25 | 505 | # define __attribute_noinline__ /* Ignore */ |
d3640b91 UD |
506 | #endif |
507 | ||
cab4d74b | 508 | /* Since version 3.2, gcc allows marking deprecated functions. */ |
c8ba52ab | 509 | #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__deprecated__) |
3b7ed871 UD |
510 | # define __attribute_deprecated__ __attribute__ ((__deprecated__)) |
511 | #else | |
512 | # define __attribute_deprecated__ /* Ignore */ | |
513 | #endif | |
514 | ||
cab4d74b ZW |
515 | /* Since version 4.5, gcc also allows one to specify the message printed |
516 | when a deprecated function is used. clang claims to be gcc 4.2, but | |
517 | may also support this feature. */ | |
34a5a146 | 518 | #if __GNUC_PREREQ (4,5) \ |
c8ba52ab | 519 | || __glibc_has_extension (__attribute_deprecated_with_message__) |
cab4d74b ZW |
520 | # define __attribute_deprecated_msg__(msg) \ |
521 | __attribute__ ((__deprecated__ (msg))) | |
522 | #else | |
523 | # define __attribute_deprecated_msg__(msg) __attribute_deprecated__ | |
524 | #endif | |
525 | ||
ca8d5a5f UD |
526 | /* At some point during the gcc 2.8 development the `format_arg' attribute |
527 | for functions was introduced. We don't want to use it unconditionally | |
f369623d UD |
528 | (although this would be possible) since it generates warnings. |
529 | If several `format_arg' attributes are given for the same function, in | |
530 | gcc-3.0 and older, all but the last one are ignored. In newer gccs, | |
531 | all designated arguments are considered. */ | |
c8ba52ab | 532 | #if __GNUC_PREREQ (2,8) || __glibc_has_attribute (__format_arg__) |
ca8d5a5f UD |
533 | # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) |
534 | #else | |
535 | # define __attribute_format_arg__(x) /* Ignore */ | |
536 | #endif | |
537 | ||
66e23ba1 UD |
538 | /* At some point during the gcc 2.97 development the `strfmon' format |
539 | attribute for functions was introduced. We don't want to use it | |
540 | unconditionally (although this would be possible) since it | |
541 | generates warnings. */ | |
c8ba52ab | 542 | #if __GNUC_PREREQ (2,97) || __glibc_has_attribute (__format__) |
66e23ba1 UD |
543 | # define __attribute_format_strfmon__(a,b) \ |
544 | __attribute__ ((__format__ (__strfmon__, a, b))) | |
545 | #else | |
546 | # define __attribute_format_strfmon__(a,b) /* Ignore */ | |
547 | #endif | |
548 | ||
c8ba52ab | 549 | /* The nonnull function attribute marks pointer parameters that |
0b5ca7c3 PE |
550 | must not be NULL. This has the name __nonnull in glibc, |
551 | and __attribute_nonnull__ in files shared with Gnulib to avoid | |
552 | collision with a different __nonnull in DragonFlyBSD 5.9. */ | |
553 | #ifndef __attribute_nonnull__ | |
c8ba52ab | 554 | # if __GNUC_PREREQ (3,3) || __glibc_has_attribute (__nonnull__) |
0b5ca7c3 | 555 | # define __attribute_nonnull__(params) __attribute__ ((__nonnull__ params)) |
c8ba52ab | 556 | # else |
0b5ca7c3 | 557 | # define __attribute_nonnull__(params) |
c8ba52ab | 558 | # endif |
0b5ca7c3 PE |
559 | #endif |
560 | #ifndef __nonnull | |
561 | # define __nonnull(params) __attribute_nonnull__ (params) | |
8a1f658b UD |
562 | #endif |
563 | ||
b8e8bb32 SP |
564 | /* The returns_nonnull function attribute marks the return type of the function |
565 | as always being non-null. */ | |
566 | #ifndef __returns_nonnull | |
567 | # if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__returns_nonnull__) | |
568 | # define __returns_nonnull __attribute__ ((__returns_nonnull__)) | |
569 | # else | |
570 | # define __returns_nonnull | |
571 | # endif | |
572 | #endif | |
573 | ||
5cf53cc2 UD |
574 | /* If fortification mode, we warn about unused results of certain |
575 | function calls which can lead to problems. */ | |
c8ba52ab | 576 | #if __GNUC_PREREQ (3,4) || __glibc_has_attribute (__warn_unused_result__) |
9ee4c017 UD |
577 | # define __attribute_warn_unused_result__ \ |
578 | __attribute__ ((__warn_unused_result__)) | |
c8ba52ab | 579 | # if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0 |
9ee4c017 UD |
580 | # define __wur __attribute_warn_unused_result__ |
581 | # endif | |
5cf53cc2 | 582 | #else |
9ee4c017 UD |
583 | # define __attribute_warn_unused_result__ /* empty */ |
584 | #endif | |
585 | #ifndef __wur | |
5cf53cc2 UD |
586 | # define __wur /* Ignore */ |
587 | #endif | |
588 | ||
88764ae2 | 589 | /* Forces a function to be always inlined. */ |
c8ba52ab | 590 | #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__always_inline__) |
e0835a53 CD |
591 | /* The Linux kernel defines __always_inline in stddef.h (283d7573), and |
592 | it conflicts with this definition. Therefore undefine it first to | |
593 | allow either header to be included first. */ | |
594 | # undef __always_inline | |
88764ae2 UD |
595 | # define __always_inline __inline __attribute__ ((__always_inline__)) |
596 | #else | |
e0835a53 | 597 | # undef __always_inline |
88764ae2 UD |
598 | # define __always_inline __inline |
599 | #endif | |
600 | ||
5ac3ea17 MP |
601 | /* Associate error messages with the source location of the call site rather |
602 | than with the source location inside the function. */ | |
c8ba52ab | 603 | #if __GNUC_PREREQ (4,3) || __glibc_has_attribute (__artificial__) |
5ac3ea17 MP |
604 | # define __attribute_artificial__ __attribute__ ((__artificial__)) |
605 | #else | |
606 | # define __attribute_artificial__ /* Ignore */ | |
607 | #endif | |
608 | ||
884ddc50 SP |
609 | /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99 |
610 | inline semantics, unless -fgnu89-inline is used. Using __GNUC_STDC_INLINE__ | |
611 | or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions | |
612 | older than 4.3 may define these macros and still not guarantee GNU inlining | |
602f80ec SP |
613 | semantics. |
614 | ||
615 | clang++ identifies itself as gcc-4.2, but has support for GNU inlining | |
a1b02ae7 | 616 | semantics, that can be checked for by using the __GNUC_STDC_INLINE_ and |
602f80ec SP |
617 | __GNUC_GNU_INLINE__ macro definitions. */ |
618 | #if (!defined __cplusplus || __GNUC_PREREQ (4,3) \ | |
619 | || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \ | |
620 | || defined __GNUC_GNU_INLINE__))) | |
884ddc50 | 621 | # if defined __GNUC_STDC_INLINE__ || defined __cplusplus |
de1c3ebb | 622 | # define __extern_inline extern __inline __attribute__ ((__gnu_inline__)) |
5ac3ea17 | 623 | # define __extern_always_inline \ |
b037a293 | 624 | extern __always_inline __attribute__ ((__gnu_inline__)) |
de1c3ebb UD |
625 | # else |
626 | # define __extern_inline extern __inline | |
5ac3ea17 | 627 | # define __extern_always_inline extern __always_inline |
de1c3ebb | 628 | # endif |
884ddc50 SP |
629 | #endif |
630 | ||
631 | #ifdef __extern_always_inline | |
632 | # define __fortify_function __extern_always_inline __attribute_artificial__ | |
de1c3ebb UD |
633 | #endif |
634 | ||
635 | /* GCC 4.3 and above allow passing all anonymous arguments of an | |
636 | __extern_always_inline function to some other vararg function. */ | |
3dd79d63 | 637 | #if __GNUC_PREREQ (4,3) |
de1c3ebb | 638 | # define __va_arg_pack() __builtin_va_arg_pack () |
3a50811c | 639 | # define __va_arg_pack_len() __builtin_va_arg_pack_len () |
b037a293 UD |
640 | #endif |
641 | ||
8325d82c UD |
642 | /* It is possible to compile containing GCC extensions even if GCC is |
643 | run in pedantic mode if the uses are carefully marked using the | |
644 | `__extension__' keyword. But this is not generally available before | |
645 | version 2.8. */ | |
c8ba52ab | 646 | #if !(__GNUC_PREREQ (2,8) || defined __clang__) |
8325d82c | 647 | # define __extension__ /* Ignore */ |
8325d82c UD |
648 | #endif |
649 | ||
c8ba52ab AZ |
650 | /* __restrict is known in EGCS 1.2 and above, and in clang. |
651 | It works also in C++ mode (outside of arrays), but only when spelled | |
652 | as '__restrict', not 'restrict'. */ | |
653 | #if !(__GNUC_PREREQ (2,92) || __clang_major__ >= 3) | |
383e87c9 JM |
654 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L |
655 | # define __restrict restrict | |
656 | # else | |
657 | # define __restrict /* Ignore */ | |
658 | # endif | |
a6ff34d7 | 659 | #endif |
2f6d1f1b | 660 | |
98cbe360 UD |
661 | /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is |
662 | array_name[restrict] | |
c8ba52ab AZ |
663 | GCC 3.1 and clang support this. |
664 | This syntax is not usable in C++ mode. */ | |
665 | #if (__GNUC_PREREQ (3,1) || __clang_major__ >= 3) && !defined __cplusplus | |
b912ca11 UD |
666 | # define __restrict_arr __restrict |
667 | #else | |
668 | # ifdef __GNUC__ | |
669 | # define __restrict_arr /* Not supported in old GCC. */ | |
670 | # else | |
671 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L | |
672 | # define __restrict_arr restrict | |
673 | # else | |
674 | /* Some other non-C99 compiler. */ | |
675 | # define __restrict_arr /* Not supported. */ | |
676 | # endif | |
677 | # endif | |
678 | #endif | |
98cbe360 | 679 | |
c8ba52ab | 680 | #if (__GNUC__ >= 3) || __glibc_has_builtin (__builtin_expect) |
4858fa2a RM |
681 | # define __glibc_unlikely(cond) __builtin_expect ((cond), 0) |
682 | # define __glibc_likely(cond) __builtin_expect ((cond), 1) | |
4af3879c | 683 | #else |
4858fa2a RM |
684 | # define __glibc_unlikely(cond) (cond) |
685 | # define __glibc_likely(cond) (cond) | |
4af3879c SP |
686 | #endif |
687 | ||
d12704c7 SP |
688 | #if (!defined _Noreturn \ |
689 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ | |
c8ba52ab AZ |
690 | && !(__GNUC_PREREQ (4,7) \ |
691 | || (3 < __clang_major__ + (5 <= __clang_minor__)))) | |
c4c41244 PE |
692 | # if __GNUC_PREREQ (2,8) |
693 | # define _Noreturn __attribute__ ((__noreturn__)) | |
694 | # else | |
695 | # define _Noreturn | |
696 | # endif | |
697 | #endif | |
698 | ||
7532837d MS |
699 | #if __GNUC_PREREQ (8, 0) |
700 | /* Describes a char array whose address can safely be passed as the first | |
701 | argument to strncpy and strncat, as the char array is not necessarily | |
702 | a NUL-terminated string. */ | |
703 | # define __attribute_nonstring__ __attribute__ ((__nonstring__)) | |
704 | #else | |
705 | # define __attribute_nonstring__ | |
706 | #endif | |
707 | ||
1626a1cf MS |
708 | /* Undefine (also defined in libc-symbols.h). */ |
709 | #undef __attribute_copy__ | |
710 | #if __GNUC_PREREQ (9, 0) | |
711 | /* Copies attributes from the declaration or type referenced by | |
712 | the argument. */ | |
713 | # define __attribute_copy__(arg) __attribute__ ((__copy__ (arg))) | |
714 | #else | |
715 | # define __attribute_copy__(arg) | |
716 | #endif | |
717 | ||
3999d26e PE |
718 | #if (!defined _Static_assert && !defined __cplusplus \ |
719 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ | |
c8ba52ab AZ |
720 | && (!(__GNUC_PREREQ (4, 6) || __clang_major__ >= 4) \ |
721 | || defined __STRICT_ANSI__)) | |
3999d26e PE |
722 | # define _Static_assert(expr, diagnostic) \ |
723 | extern int (*__Static_assert_function (void)) \ | |
724 | [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })] | |
725 | #endif | |
726 | ||
0b5ca7c3 PE |
727 | /* Gnulib avoids including these, as they don't work on non-glibc or |
728 | older glibc platforms. */ | |
729 | #ifndef __GNULIB_CDEFS | |
c8ba52ab AZ |
730 | # include <bits/wordsize.h> |
731 | # include <bits/long-double.h> | |
732 | #endif | |
c6251f03 | 733 | |
e2239af3 | 734 | #if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 |
e4a39992 GG |
735 | # ifdef __REDIRECT |
736 | ||
737 | /* Alias name defined automatically. */ | |
738 | # define __LDBL_REDIR(name, proto) ... unused__ldbl_redir | |
739 | # define __LDBL_REDIR_DECL(name) \ | |
740 | extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128")); | |
1a57ab0c SM |
741 | # define __REDIRECT_LDBL(name, proto, alias) \ |
742 | name proto __asm (__ASMNAME ("__" #alias "ieee128")) | |
e4a39992 GG |
743 | |
744 | /* Alias name defined automatically, with leading underscores. */ | |
745 | # define __LDBL_REDIR2_DECL(name) \ | |
746 | extern __typeof (__##name) __##name \ | |
747 | __asm (__ASMNAME ("__" #name "ieee128")); | |
748 | ||
749 | /* Alias name defined manually. */ | |
750 | # define __LDBL_REDIR1(name, proto, alias) ... unused__ldbl_redir1 | |
751 | # define __LDBL_REDIR1_DECL(name, alias) \ | |
752 | extern __typeof (name) name __asm (__ASMNAME (#alias)); | |
753 | ||
754 | # define __LDBL_REDIR1_NTH(name, proto, alias) \ | |
755 | __REDIRECT_NTH (name, proto, alias) | |
756 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ | |
757 | __LDBL_REDIR1_NTH (name, proto, __##alias##ieee128) | |
758 | ||
759 | /* Unused. */ | |
e4a39992 GG |
760 | # define __LDBL_REDIR_NTH(name, proto) ... unused__ldbl_redir_nth |
761 | ||
762 | # else | |
763 | _Static_assert (0, "IEEE 128-bits long double requires redirection on this platform"); | |
764 | # endif | |
765 | #elif defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH | |
c6251f03 RM |
766 | # define __LDBL_COMPAT 1 |
767 | # ifdef __REDIRECT | |
768 | # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias) | |
769 | # define __LDBL_REDIR(name, proto) \ | |
770 | __LDBL_REDIR1 (name, proto, __nldbl_##name) | |
771 | # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias) | |
772 | # define __LDBL_REDIR_NTH(name, proto) \ | |
773 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##name) | |
e4a39992 GG |
774 | # define __LDBL_REDIR2_DECL(name) \ |
775 | extern __typeof (__##name) __##name __asm (__ASMNAME ("__nldbl___" #name)); | |
54e98f69 RM |
776 | # define __LDBL_REDIR1_DECL(name, alias) \ |
777 | extern __typeof (name) name __asm (__ASMNAME (#alias)); | |
c6251f03 | 778 | # define __LDBL_REDIR_DECL(name) \ |
54e98f69 | 779 | extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name)); |
ac97dec1 UD |
780 | # define __REDIRECT_LDBL(name, proto, alias) \ |
781 | __LDBL_REDIR1 (name, proto, __nldbl_##alias) | |
782 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ | |
783 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias) | |
c6251f03 RM |
784 | # endif |
785 | #endif | |
e2239af3 | 786 | #if (!defined __LDBL_COMPAT && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0) \ |
e4a39992 | 787 | || !defined __REDIRECT |
c6251f03 RM |
788 | # define __LDBL_REDIR1(name, proto, alias) name proto |
789 | # define __LDBL_REDIR(name, proto) name proto | |
790 | # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW | |
791 | # define __LDBL_REDIR_NTH(name, proto) name proto __THROW | |
e4a39992 | 792 | # define __LDBL_REDIR2_DECL(name) |
c6251f03 | 793 | # define __LDBL_REDIR_DECL(name) |
ac97dec1 UD |
794 | # ifdef __REDIRECT |
795 | # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias) | |
796 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ | |
797 | __REDIRECT_NTH (name, proto, alias) | |
798 | # endif | |
c6251f03 RM |
799 | #endif |
800 | ||
bfbd1de1 | 801 | /* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is |
809b72df ZW |
802 | intended for use in preprocessor macros. |
803 | ||
804 | Note: MESSAGE must be a _single_ string; concatenation of string | |
805 | literals is not supported. */ | |
806 | #if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5) | |
bfbd1de1 FW |
807 | # define __glibc_macro_warning1(message) _Pragma (#message) |
808 | # define __glibc_macro_warning(message) \ | |
809 | __glibc_macro_warning1 (GCC warning message) | |
810 | #else | |
811 | # define __glibc_macro_warning(msg) | |
812 | #endif | |
813 | ||
6913ad65 GG |
814 | /* Generic selection (ISO C11) is a C-only feature, available in GCC |
815 | since version 4.9. Previous versions do not provide generic | |
816 | selection, even though they might set __STDC_VERSION__ to 201112L, | |
817 | when in -std=c11 mode. Thus, we must check for !defined __GNUC__ | |
818 | when testing __STDC_VERSION__ for generic selection support. | |
477bf19a GG |
819 | On the other hand, Clang also defines __GNUC__, so a clang-specific |
820 | check is required to enable the use of generic selection. */ | |
6913ad65 GG |
821 | #if !defined __cplusplus \ |
822 | && (__GNUC_PREREQ (4, 9) \ | |
c8ba52ab | 823 | || __glibc_has_extension (c_generic_selections) \ |
6913ad65 GG |
824 | || (!defined __GNUC__ && defined __STDC_VERSION__ \ |
825 | && __STDC_VERSION__ >= 201112L)) | |
477bf19a GG |
826 | # define __HAVE_GENERIC_SELECTION 1 |
827 | #else | |
828 | # define __HAVE_GENERIC_SELECTION 0 | |
829 | #endif | |
830 | ||
06febd8c MS |
831 | #if __GNUC_PREREQ (10, 0) |
832 | /* Designates a 1-based positional argument ref-index of pointer type | |
833 | that can be used to access size-index elements of the pointed-to | |
834 | array according to access mode, or at least one element when | |
835 | size-index is not provided: | |
836 | access (access-mode, <ref-index> [, <size-index>]) */ | |
a1561c3b | 837 | # define __attr_access(x) __attribute__ ((__access__ x)) |
e938c027 SP |
838 | /* For _FORTIFY_SOURCE == 3 we use __builtin_dynamic_object_size, which may |
839 | use the access attribute to get object sizes from function definition | |
840 | arguments, so we can't use them on functions we fortify. Drop the object | |
841 | size hints for such functions. */ | |
842 | # if __USE_FORTIFY_LEVEL == 3 | |
843 | # define __fortified_attr_access(a, o, s) __attribute__ ((__access__ (a, o))) | |
844 | # else | |
845 | # define __fortified_attr_access(a, o, s) __attr_access ((a, o, s)) | |
846 | # endif | |
a1561c3b MS |
847 | # if __GNUC_PREREQ (11, 0) |
848 | # define __attr_access_none(argno) __attribute__ ((__access__ (__none__, argno))) | |
849 | # else | |
850 | # define __attr_access_none(argno) | |
851 | # endif | |
06febd8c | 852 | #else |
e938c027 | 853 | # define __fortified_attr_access(a, o, s) |
06febd8c | 854 | # define __attr_access(x) |
a1561c3b | 855 | # define __attr_access_none(argno) |
06febd8c MS |
856 | #endif |
857 | ||
c1760eaf MS |
858 | #if __GNUC_PREREQ (11, 0) |
859 | /* Designates dealloc as a function to call to deallocate objects | |
860 | allocated by the declared function. */ | |
861 | # define __attr_dealloc(dealloc, argno) \ | |
862 | __attribute__ ((__malloc__ (dealloc, argno))) | |
863 | # define __attr_dealloc_free __attr_dealloc (__builtin_free, 1) | |
864 | #else | |
865 | # define __attr_dealloc(dealloc, argno) | |
866 | # define __attr_dealloc_free | |
867 | #endif | |
868 | ||
548f467f JM |
869 | /* Specify that a function such as setjmp or vfork may return |
870 | twice. */ | |
871 | #if __GNUC_PREREQ (4, 1) | |
872 | # define __attribute_returns_twice__ __attribute__ ((__returns_twice__)) | |
873 | #else | |
874 | # define __attribute_returns_twice__ /* Ignore. */ | |
875 | #endif | |
876 | ||
28f540f4 | 877 | #endif /* sys/cdefs.h */ |