Mercurial > gnulib
annotate lib/cdefs.h @ 40057:b06060465f09
maint: Run 'make update-copyright'
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Tue, 01 Jan 2019 00:25:11 +0100 |
| parents | ebff5813108e |
| children | f63c4e7dfb31 |
| rev | line source |
|---|---|
|
40057
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maint: Run 'make update-copyright'
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1 /* Copyright (C) 1992-2019 Free Software Foundation, Inc. |
| 19105 | 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 | |
| 19190 | 16 <https://www.gnu.org/licenses/>. */ |
| 19105 | 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 | |
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75 # if (defined __cplusplus \ |
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76 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) |
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77 # define __inline inline |
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78 # else |
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79 # define __inline /* No inline functions. */ |
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80 # endif |
| 19105 | 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. */ | |
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142 #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc |
| 19105 | 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 | |
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290 /* The nonnull function attribute marks pointer parameters that |
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291 must not be NULL. Do not define __nonnull if it is already defined, |
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292 for portability when this file is used in Gnulib. */ |
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293 #ifndef __nonnull |
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294 # if __GNUC_PREREQ (3,3) |
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295 # define __nonnull(params) __attribute__ ((__nonnull__ params)) |
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296 # else |
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297 # define __nonnull(params) |
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298 # endif |
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299 #endif |
| 19105 | 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__)) | |
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306 # if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0 |
| 19105 | 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 fot 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) | |
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379 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L |
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380 # define __restrict restrict |
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381 # else |
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382 # define __restrict /* Ignore */ |
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383 # endif |
| 19105 | 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 | |
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412 #ifdef __has_attribute |
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413 # define __glibc_has_attribute(attr) __has_attribute (attr) |
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414 #else |
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415 # define __glibc_has_attribute(attr) 0 |
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416 #endif |
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417 |
| 19105 | 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 | |
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428 #if __GNUC_PREREQ (8, 0) |
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429 /* Describes a char array whose address can safely be passed as the first |
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430 argument to strncpy and strncat, as the char array is not necessarily |
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431 a NUL-terminated string. */ |
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432 # define __attribute_nonstring__ __attribute__ ((__nonstring__)) |
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433 #else |
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434 # define __attribute_nonstring__ |
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435 #endif |
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436 |
| 19105 | 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 */ |