1 /* Copyright (C) 1992-2021 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _SYS_CDEFS_H 19 #define _SYS_CDEFS_H 1 20 21 /* We are almost always included from features.h. */ 22 #ifndef _FEATURES_H 23 # include <features.h> 24 #endif 25 26 /* The GNU libc does not support any K&R compilers or the traditional mode 27 of ISO C compilers anymore. Check for some of the combinations not 28 supported anymore. */ 29 #if defined __GNUC__ && !defined __STDC__ 30 # error "You need a ISO C conforming compiler to use the glibc headers" 31 #endif 32 33 /* Some user header file might have defined this before. */ 34 #undef __P 35 #undef __PMT 36 37 /* Compilers that lack __has_attribute may object to 38 #if defined __has_attribute && __has_attribute (...) 39 even though they do not need to evaluate the right-hand side of the &&. 40 Similarly for __has_builtin, etc. */ 41 #if (defined __has_attribute \ 42 && (!defined __clang_minor__ \ 43 || 3 < __clang_major__ + (5 <= __clang_minor__))) 44 # define __glibc_has_attribute(attr) __has_attribute (attr) 45 #else 46 # define __glibc_has_attribute(attr) 0 47 #endif 48 #ifdef __has_builtin 49 # define __glibc_has_builtin(name) __has_builtin (name) 50 #else 51 # define __glibc_has_builtin(name) 0 52 #endif 53 #ifdef __has_extension 54 # define __glibc_has_extension(ext) __has_extension (ext) 55 #else 56 # define __glibc_has_extension(ext) 0 57 #endif 58 59 #if defined __GNUC__ || defined __clang__ 60 61 /* All functions, except those with callbacks or those that 62 synchronize memory, are leaf functions. */ 63 # if __GNUC_PREREQ (4, 6) && !defined _LIBC 64 # define __LEAF , __leaf__ 65 # define __LEAF_ATTR __attribute__ ((__leaf__)) 66 # else 67 # define __LEAF 68 # define __LEAF_ATTR 69 # endif 70 71 /* GCC can always grok prototypes. For C++ programs we add throw() 72 to help it optimize the function calls. But this only works with 73 gcc 2.8.x and egcs. For gcc 3.4 and up we even mark C functions 74 as non-throwing using a function attribute since programs can use 75 the -fexceptions options for C code as well. */ 76 # if !defined __cplusplus \ 77 && (__GNUC_PREREQ (3, 4) || __glibc_has_attribute (__nothrow__)) 78 # define __THROW __attribute__ ((__nothrow__ __LEAF)) 79 # define __THROWNL __attribute__ ((__nothrow__)) 80 # define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) fct 81 # define __NTHNL(fct) __attribute__ ((__nothrow__)) fct 82 # else 83 # if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major >= 4) 84 # if __cplusplus >= 201103L 85 # define __THROW noexcept (true) 86 # else 87 # define __THROW throw () 88 # endif 89 # define __THROWNL __THROW 90 # define __NTH(fct) __LEAF_ATTR fct __THROW 91 # define __NTHNL(fct) fct __THROW 92 # else 93 # define __THROW 94 # define __THROWNL 95 # define __NTH(fct) fct 96 # define __NTHNL(fct) fct 97 # endif 98 # endif 99 100 #else /* Not GCC or clang. */ 101 102 # if (defined __cplusplus \ 103 || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) 104 # define __inline inline 105 # else 106 # define __inline /* No inline functions. */ 107 # endif 108 109 # define __THROW 110 # define __THROWNL 111 # define __NTH(fct) fct 112 113 #endif /* GCC || clang. */ 114 115 /* These two macros are not used in glibc anymore. They are kept here 116 only because some other projects expect the macros to be defined. */ 117 #define __P(args) args 118 #define __PMT(args) args 119 120 /* For these things, GCC behaves the ANSI way normally, 121 and the non-ANSI way under -traditional. */ 122 123 #define __CONCAT(x,y) x ## y 124 #define __STRING(x) #x 125 126 /* This is not a typedef so `const __ptr_t' does the right thing. */ 127 #define __ptr_t void * 128 129 130 /* C++ needs to know that types and declarations are C, not C++. */ 131 #ifdef __cplusplus 132 # define __BEGIN_DECLS extern "C" { 133 # define __END_DECLS } 134 #else 135 # define __BEGIN_DECLS 136 # define __END_DECLS 137 #endif 138 139 140 /* Fortify support. */ 141 #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1) 142 #define __bos0(ptr) __builtin_object_size (ptr, 0) 143 144 /* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available. */ 145 #if __USE_FORTIFY_LEVEL == 3 && __glibc_clang_prereq (9, 0) 146 # define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0) 147 # define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1) 148 #else 149 # define __glibc_objsize0(__o) __bos0 (__o) 150 # define __glibc_objsize(__o) __bos (__o) 151 #endif 152 153 #if __GNUC_PREREQ (4,3) 154 # define __warnattr(msg) __attribute__((__warning__ (msg))) 155 # define __errordecl(name, msg) \ 156 extern void name (void) __attribute__((__error__ (msg))) 157 #else 158 # define __warnattr(msg) 159 # define __errordecl(name, msg) extern void name (void) 160 #endif 161 162 /* Support for flexible arrays. 163 Headers that should use flexible arrays only if they're "real" 164 (e.g. only if they won't affect sizeof()) should test 165 #if __glibc_c99_flexarr_available. */ 166 #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc 167 # define __flexarr [] 168 # define __glibc_c99_flexarr_available 1 169 #elif __GNUC_PREREQ (2,97) || defined __clang__ 170 /* GCC 2.97 and clang support C99 flexible array members as an extension, 171 even when in C89 mode or compiling C++ (any version). */ 172 # define __flexarr [] 173 # define __glibc_c99_flexarr_available 1 174 #elif defined __GNUC__ 175 /* Pre-2.97 GCC did not support C99 flexible arrays but did have 176 an equivalent extension with slightly different notation. */ 177 # define __flexarr [0] 178 # define __glibc_c99_flexarr_available 1 179 #else 180 /* Some other non-C99 compiler. Approximate with [1]. */ 181 # define __flexarr [1] 182 # define __glibc_c99_flexarr_available 0 183 #endif 184 185 186 /* __asm__ ("xyz") is used throughout the headers to rename functions 187 at the assembly language level. This is wrapped by the __REDIRECT 188 macro, in order to support compilers that can do this some other 189 way. When compilers don't support asm-names at all, we have to do 190 preprocessor tricks instead (which don't have exactly the right 191 semantics, but it's the best we can do). 192 193 Example: 194 int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ 195 196 #if (defined __GNUC__ && __GNUC__ >= 2) || (__clang_major__ >= 4) 197 198 # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) 199 # ifdef __cplusplus 200 # define __REDIRECT_NTH(name, proto, alias) \ 201 name proto __THROW __asm__ (__ASMNAME (#alias)) 202 # define __REDIRECT_NTHNL(name, proto, alias) \ 203 name proto __THROWNL __asm__ (__ASMNAME (#alias)) 204 # else 205 # define __REDIRECT_NTH(name, proto, alias) \ 206 name proto __asm__ (__ASMNAME (#alias)) __THROW 207 # define __REDIRECT_NTHNL(name, proto, alias) \ 208 name proto __asm__ (__ASMNAME (#alias)) __THROWNL 209 # endif 210 # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) 211 # define __ASMNAME2(prefix, cname) __STRING (prefix) cname 212 213 /* 214 #elif __SOME_OTHER_COMPILER__ 215 216 # define __REDIRECT(name, proto, alias) name proto; \ 217 _Pragma("let " #name " = " #alias) 218 */ 219 #endif 220 221 /* GCC and clang have various useful declarations that can be made with 222 the '__attribute__' syntax. All of the ways we use this do fine if 223 they are omitted for compilers that don't understand it. */ 224 #if !(defined __GNUC__ || defined __clang__) 225 # define __attribute__(xyz) /* Ignore */ 226 #endif 227 228 /* At some point during the gcc 2.96 development the `malloc' attribute 229 for functions was introduced. We don't want to use it unconditionally 230 (although this would be possible) since it generates warnings. */ 231 #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__malloc__) 232 # define __attribute_malloc__ __attribute__ ((__malloc__)) 233 #else 234 # define __attribute_malloc__ /* Ignore */ 235 #endif 236 237 /* Tell the compiler which arguments to an allocation function 238 indicate the size of the allocation. */ 239 #if __GNUC_PREREQ (4, 3) 240 # define __attribute_alloc_size__(params) \ 241 __attribute__ ((__alloc_size__ params)) 242 #else 243 # define __attribute_alloc_size__(params) /* Ignore. */ 244 #endif 245 246 /* At some point during the gcc 2.96 development the `pure' attribute 247 for functions was introduced. We don't want to use it unconditionally 248 (although this would be possible) since it generates warnings. */ 249 #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__pure__) 250 # define __attribute_pure__ __attribute__ ((__pure__)) 251 #else 252 # define __attribute_pure__ /* Ignore */ 253 #endif 254 255 /* This declaration tells the compiler that the value is constant. */ 256 #if __GNUC_PREREQ (2,5) || __glibc_has_attribute (__const__) 257 # define __attribute_const__ __attribute__ ((__const__)) 258 #else 259 # define __attribute_const__ /* Ignore */ 260 #endif 261 262 #if __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__) 263 # define __attribute_maybe_unused__ __attribute__ ((__unused__)) 264 #else 265 # define __attribute_maybe_unused__ /* Ignore */ 266 #endif 267 268 /* At some point during the gcc 3.1 development the `used' attribute 269 for functions was introduced. We don't want to use it unconditionally 270 (although this would be possible) since it generates warnings. */ 271 #if __GNUC_PREREQ (3,1) || __glibc_has_attribute (__used__) 272 # define __attribute_used__ __attribute__ ((__used__)) 273 # define __attribute_noinline__ __attribute__ ((__noinline__)) 274 #else 275 # define __attribute_used__ __attribute__ ((__unused__)) 276 # define __attribute_noinline__ /* Ignore */ 277 #endif 278 279 /* Since version 3.2, gcc allows marking deprecated functions. */ 280 #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__deprecated__) 281 # define __attribute_deprecated__ __attribute__ ((__deprecated__)) 282 #else 283 # define __attribute_deprecated__ /* Ignore */ 284 #endif 285 286 /* Since version 4.5, gcc also allows one to specify the message printed 287 when a deprecated function is used. clang claims to be gcc 4.2, but 288 may also support this feature. */ 289 #if __GNUC_PREREQ (4,5) \ 290 || __glibc_has_extension (__attribute_deprecated_with_message__) 291 # define __attribute_deprecated_msg__(msg) \ 292 __attribute__ ((__deprecated__ (msg))) 293 #else 294 # define __attribute_deprecated_msg__(msg) __attribute_deprecated__ 295 #endif 296 297 /* At some point during the gcc 2.8 development the `format_arg' attribute 298 for functions was introduced. We don't want to use it unconditionally 299 (although this would be possible) since it generates warnings. 300 If several `format_arg' attributes are given for the same function, in 301 gcc-3.0 and older, all but the last one are ignored. In newer gccs, 302 all designated arguments are considered. */ 303 #if __GNUC_PREREQ (2,8) || __glibc_has_attribute (__format_arg__) 304 # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) 305 #else 306 # define __attribute_format_arg__(x) /* Ignore */ 307 #endif 308 309 /* At some point during the gcc 2.97 development the `strfmon' format 310 attribute for functions was introduced. We don't want to use it 311 unconditionally (although this would be possible) since it 312 generates warnings. */ 313 #if __GNUC_PREREQ (2,97) || __glibc_has_attribute (__format__) 314 # define __attribute_format_strfmon__(a,b) \ 315 __attribute__ ((__format__ (__strfmon__, a, b))) 316 #else 317 # define __attribute_format_strfmon__(a,b) /* Ignore */ 318 #endif 319 320 /* The nonnull function attribute marks pointer parameters that 321 must not be NULL. This has the name __nonnull in glibc, 322 and __attribute_nonnull__ in files shared with Gnulib to avoid 323 collision with a different __nonnull in DragonFlyBSD 5.9. */ 324 #ifndef __attribute_nonnull__ 325 # if __GNUC_PREREQ (3,3) || __glibc_has_attribute (__nonnull__) 326 # define __attribute_nonnull__(params) __attribute__ ((__nonnull__ params)) 327 # else 328 # define __attribute_nonnull__(params) 329 # endif 330 #endif 331 #ifndef __nonnull 332 # define __nonnull(params) __attribute_nonnull__ (params) 333 #endif 334 335 /* The returns_nonnull function attribute marks the return type of the function 336 as always being non-null. */ 337 #ifndef __returns_nonnull 338 # if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__returns_nonnull__) 339 # define __returns_nonnull __attribute__ ((__returns_nonnull__)) 340 # else 341 # define __returns_nonnull 342 # endif 343 #endif 344 345 /* If fortification mode, we warn about unused results of certain 346 function calls which can lead to problems. */ 347 #if __GNUC_PREREQ (3,4) || __glibc_has_attribute (__warn_unused_result__) 348 # define __attribute_warn_unused_result__ \ 349 __attribute__ ((__warn_unused_result__)) 350 # if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0 351 # define __wur __attribute_warn_unused_result__ 352 # endif 353 #else 354 # define __attribute_warn_unused_result__ /* empty */ 355 #endif 356 #ifndef __wur 357 # define __wur /* Ignore */ 358 #endif 359 360 /* Forces a function to be always inlined. */ 361 #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__always_inline__) 362 /* The Linux kernel defines __always_inline in stddef.h (283d7573), and 363 it conflicts with this definition. Therefore undefine it first to 364 allow either header to be included first. */ 365 # undef __always_inline 366 # define __always_inline __inline __attribute__ ((__always_inline__)) 367 #else 368 # undef __always_inline 369 # define __always_inline __inline 370 #endif 371 372 /* Associate error messages with the source location of the call site rather 373 than with the source location inside the function. */ 374 #if __GNUC_PREREQ (4,3) || __glibc_has_attribute (__artificial__) 375 # define __attribute_artificial__ __attribute__ ((__artificial__)) 376 #else 377 # define __attribute_artificial__ /* Ignore */ 378 #endif 379 380 /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99 381 inline semantics, unless -fgnu89-inline is used. Using __GNUC_STDC_INLINE__ 382 or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions 383 older than 4.3 may define these macros and still not guarantee GNU inlining 384 semantics. 385 386 clang++ identifies itself as gcc-4.2, but has support for GNU inlining 387 semantics, that can be checked for by using the __GNUC_STDC_INLINE_ and 388 __GNUC_GNU_INLINE__ macro definitions. */ 389 #if (!defined __cplusplus || __GNUC_PREREQ (4,3) \ 390 || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \ 391 || defined __GNUC_GNU_INLINE__))) 392 # if defined __GNUC_STDC_INLINE__ || defined __cplusplus 393 # define __extern_inline extern __inline __attribute__ ((__gnu_inline__)) 394 # define __extern_always_inline \ 395 extern __always_inline __attribute__ ((__gnu_inline__)) 396 # else 397 # define __extern_inline extern __inline 398 # define __extern_always_inline extern __always_inline 399 # endif 400 #endif 401 402 #ifdef __extern_always_inline 403 # define __fortify_function __extern_always_inline __attribute_artificial__ 404 #endif 405 406 /* GCC 4.3 and above allow passing all anonymous arguments of an 407 __extern_always_inline function to some other vararg function. */ 408 #if __GNUC_PREREQ (4,3) 409 # define __va_arg_pack() __builtin_va_arg_pack () 410 # define __va_arg_pack_len() __builtin_va_arg_pack_len () 411 #endif 412 413 /* It is possible to compile containing GCC extensions even if GCC is 414 run in pedantic mode if the uses are carefully marked using the 415 `__extension__' keyword. But this is not generally available before 416 version 2.8. */ 417 #if !(__GNUC_PREREQ (2,8) || defined __clang__) 418 # define __extension__ /* Ignore */ 419 #endif 420 421 /* __restrict is known in EGCS 1.2 and above, and in clang. 422 It works also in C++ mode (outside of arrays), but only when spelled 423 as '__restrict', not 'restrict'. */ 424 #if !(__GNUC_PREREQ (2,92) || __clang_major__ >= 3) 425 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 426 # define __restrict restrict 427 # else 428 # define __restrict /* Ignore */ 429 # endif 430 #endif 431 432 /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is 433 array_name[restrict] 434 GCC 3.1 and clang support this. 435 This syntax is not usable in C++ mode. */ 436 #if (__GNUC_PREREQ (3,1) || __clang_major__ >= 3) && !defined __cplusplus 437 # define __restrict_arr __restrict 438 #else 439 # ifdef __GNUC__ 440 # define __restrict_arr /* Not supported in old GCC. */ 441 # else 442 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 443 # define __restrict_arr restrict 444 # else 445 /* Some other non-C99 compiler. */ 446 # define __restrict_arr /* Not supported. */ 447 # endif 448 # endif 449 #endif 450 451 #if (__GNUC__ >= 3) || __glibc_has_builtin (__builtin_expect) 452 # define __glibc_unlikely(cond) __builtin_expect ((cond), 0) 453 # define __glibc_likely(cond) __builtin_expect ((cond), 1) 454 #else 455 # define __glibc_unlikely(cond) (cond) 456 # define __glibc_likely(cond) (cond) 457 #endif 458 459 #if (!defined _Noreturn \ 460 && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ 461 && !(__GNUC_PREREQ (4,7) \ 462 || (3 < __clang_major__ + (5 <= __clang_minor__)))) 463 # if __GNUC_PREREQ (2,8) 464 # define _Noreturn __attribute__ ((__noreturn__)) 465 # else 466 # define _Noreturn 467 # endif 468 #endif 469 470 #if __GNUC_PREREQ (8, 0) 471 /* Describes a char array whose address can safely be passed as the first 472 argument to strncpy and strncat, as the char array is not necessarily 473 a NUL-terminated string. */ 474 # define __attribute_nonstring__ __attribute__ ((__nonstring__)) 475 #else 476 # define __attribute_nonstring__ 477 #endif 478 479 /* Undefine (also defined in libc-symbols.h). */ 480 #undef __attribute_copy__ 481 #if __GNUC_PREREQ (9, 0) 482 /* Copies attributes from the declaration or type referenced by 483 the argument. */ 484 # define __attribute_copy__(arg) __attribute__ ((__copy__ (arg))) 485 #else 486 # define __attribute_copy__(arg) 487 #endif 488 489 #if (!defined _Static_assert && !defined __cplusplus \ 490 && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \ 491 && (!(__GNUC_PREREQ (4, 6) || __clang_major__ >= 4) \ 492 || defined __STRICT_ANSI__)) 493 # define _Static_assert(expr, diagnostic) \ 494 extern int (*__Static_assert_function (void)) \ 495 [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })] 496 #endif 497 498 /* Gnulib avoids including these, as they don't work on non-glibc or 499 older glibc platforms. */ 500 #ifndef __GNULIB_CDEFS 501 # include <bits/wordsize.h> 502 # include <bits/long-double.h> 503 #endif 504 505 #if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 506 # ifdef __REDIRECT 507 508 /* Alias name defined automatically. */ 509 # define __LDBL_REDIR(name, proto) ... unused__ldbl_redir 510 # define __LDBL_REDIR_DECL(name) \ 511 extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128")); 512 513 /* Alias name defined automatically, with leading underscores. */ 514 # define __LDBL_REDIR2_DECL(name) \ 515 extern __typeof (__##name) __##name \ 516 __asm (__ASMNAME ("__" #name "ieee128")); 517 518 /* Alias name defined manually. */ 519 # define __LDBL_REDIR1(name, proto, alias) ... unused__ldbl_redir1 520 # define __LDBL_REDIR1_DECL(name, alias) \ 521 extern __typeof (name) name __asm (__ASMNAME (#alias)); 522 523 # define __LDBL_REDIR1_NTH(name, proto, alias) \ 524 __REDIRECT_NTH (name, proto, alias) 525 # define __REDIRECT_NTH_LDBL(name, proto, alias) \ 526 __LDBL_REDIR1_NTH (name, proto, __##alias##ieee128) 527 528 /* Unused. */ 529 # define __REDIRECT_LDBL(name, proto, alias) ... unused__redirect_ldbl 530 # define __LDBL_REDIR_NTH(name, proto) ... unused__ldbl_redir_nth 531 532 # else 533 _Static_assert (0, "IEEE 128-bits long double requires redirection on this platform"); 534 # endif 535 #elif defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH 536 # define __LDBL_COMPAT 1 537 # ifdef __REDIRECT 538 # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias) 539 # define __LDBL_REDIR(name, proto) \ 540 __LDBL_REDIR1 (name, proto, __nldbl_##name) 541 # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias) 542 # define __LDBL_REDIR_NTH(name, proto) \ 543 __LDBL_REDIR1_NTH (name, proto, __nldbl_##name) 544 # define __LDBL_REDIR2_DECL(name) \ 545 extern __typeof (__##name) __##name __asm (__ASMNAME ("__nldbl___" #name)); 546 # define __LDBL_REDIR1_DECL(name, alias) \ 547 extern __typeof (name) name __asm (__ASMNAME (#alias)); 548 # define __LDBL_REDIR_DECL(name) \ 549 extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name)); 550 # define __REDIRECT_LDBL(name, proto, alias) \ 551 __LDBL_REDIR1 (name, proto, __nldbl_##alias) 552 # define __REDIRECT_NTH_LDBL(name, proto, alias) \ 553 __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias) 554 # endif 555 #endif 556 #if (!defined __LDBL_COMPAT && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0) \ 557 || !defined __REDIRECT 558 # define __LDBL_REDIR1(name, proto, alias) name proto 559 # define __LDBL_REDIR(name, proto) name proto 560 # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW 561 # define __LDBL_REDIR_NTH(name, proto) name proto __THROW 562 # define __LDBL_REDIR2_DECL(name) 563 # define __LDBL_REDIR_DECL(name) 564 # ifdef __REDIRECT 565 # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias) 566 # define __REDIRECT_NTH_LDBL(name, proto, alias) \ 567 __REDIRECT_NTH (name, proto, alias) 568 # endif 569 #endif 570 571 /* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is 572 intended for use in preprocessor macros. 573 574 Note: MESSAGE must be a _single_ string; concatenation of string 575 literals is not supported. */ 576 #if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5) 577 # define __glibc_macro_warning1(message) _Pragma (#message) 578 # define __glibc_macro_warning(message) \ 579 __glibc_macro_warning1 (GCC warning message) 580 #else 581 # define __glibc_macro_warning(msg) 582 #endif 583 584 /* Generic selection (ISO C11) is a C-only feature, available in GCC 585 since version 4.9. Previous versions do not provide generic 586 selection, even though they might set __STDC_VERSION__ to 201112L, 587 when in -std=c11 mode. Thus, we must check for !defined __GNUC__ 588 when testing __STDC_VERSION__ for generic selection support. 589 On the other hand, Clang also defines __GNUC__, so a clang-specific 590 check is required to enable the use of generic selection. */ 591 #if !defined __cplusplus \ 592 && (__GNUC_PREREQ (4, 9) \ 593 || __glibc_has_extension (c_generic_selections) \ 594 || (!defined __GNUC__ && defined __STDC_VERSION__ \ 595 && __STDC_VERSION__ >= 201112L)) 596 # define __HAVE_GENERIC_SELECTION 1 597 #else 598 # define __HAVE_GENERIC_SELECTION 0 599 #endif 600 601 #if __GNUC_PREREQ (10, 0) 602 /* Designates a 1-based positional argument ref-index of pointer type 603 that can be used to access size-index elements of the pointed-to 604 array according to access mode, or at least one element when 605 size-index is not provided: 606 access (access-mode, <ref-index> [, <size-index>]) */ 607 # define __attr_access(x) __attribute__ ((__access__ x)) 608 # if __GNUC_PREREQ (11, 0) 609 # define __attr_access_none(argno) __attribute__ ((__access__ (__none__, argno))) 610 # else 611 # define __attr_access_none(argno) 612 # endif 613 #else 614 # define __attr_access(x) 615 # define __attr_access_none(argno) 616 #endif 617 618 #if __GNUC_PREREQ (11, 0) 619 /* Designates dealloc as a function to call to deallocate objects 620 allocated by the declared function. */ 621 # define __attr_dealloc(dealloc, argno) \ 622 __attribute__ ((__malloc__ (dealloc, argno))) 623 # define __attr_dealloc_free __attr_dealloc (__builtin_free, 1) 624 #else 625 # define __attr_dealloc(dealloc, argno) 626 # define __attr_dealloc_free 627 #endif 628 629 /* Specify that a function such as setjmp or vfork may return 630 twice. */ 631 #if __GNUC_PREREQ (4, 1) 632 # define __attribute_returns_twice__ __attribute__ ((__returns_twice__)) 633 #else 634 # define __attribute_returns_twice__ /* Ignore. */ 635 #endif 636 637 #endif /* sys/cdefs.h */ 638