1 /* Copyright (C) 1992-2002, 2004, 2005, 2006, 2007, 2009, 2011, 2012 2 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 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. 9 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 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _SYS_CDEFS_H 20 #define _SYS_CDEFS_H 1 21 22 /* We are almost always included from features.h. */ 23 #ifndef _FEATURES_H 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 29 anymore supported. */ 30 #if defined __GNUC__ && !defined __STDC__ 31 # error "You need a ISO C conforming compiler to use the glibc headers" 32 #endif 33 34 /* Some user header file might have defined this before. */ 35 #undef __P 36 #undef __PMT 37 38 #ifdef __GNUC__ 39 40 /* All functions, except those with callbacks or those that 41 synchronize memory, are leaf functions. */ 42 # if __GNUC_PREREQ (4, 6) && !defined _LIBC 43 # define __LEAF , __leaf__ 44 # define __LEAF_ATTR __attribute__ ((__leaf__)) 45 # else 46 # define __LEAF 47 # define __LEAF_ATTR 48 # endif 49 50 /* GCC can always grok prototypes. For C++ programs we add throw() 51 to help it optimize the function calls. But this works only with 52 gcc 2.8.x and egcs. For gcc 3.2 and up we even mark C functions 53 as non-throwing using a function attribute since programs can use 54 the -fexceptions options for C code as well. */ 55 # if !defined __cplusplus && __GNUC_PREREQ (3, 3) 56 # define __THROW __attribute__ ((__nothrow__ __LEAF)) 57 # define __THROWNL __attribute__ ((__nothrow__)) 58 # define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) 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 # else 65 # define __THROW 66 # define __THROWNL 67 # define __NTH(fct) fct 68 # endif 69 # endif 70 71 #else /* Not GCC. */ 72 73 # define __inline /* No inline functions. */ 74 75 # define __THROW 76 # define __THROWNL 77 # define __NTH(fct) fct 78 79 #endif /* GCC. */ 80 81 /* These two macros are not used in glibc anymore. They are kept here 82 only because some other projects expect the macros to be defined. */ 83 #define __P(args) args 84 #define __PMT(args) args 85 86 /* For these things, GCC behaves the ANSI way normally, 87 and the non-ANSI way under -traditional. */ 88 89 #define __CONCAT(x,y) x ## y 90 #define __STRING(x) #x 91 92 /* This is not a typedef so `const __ptr_t' does the right thing. */ 93 #define __ptr_t void * 94 #define __long_double_t long double 95 96 97 /* C++ needs to know that types and declarations are C, not C++. */ 98 #ifdef __cplusplus 99 # define __BEGIN_DECLS extern "C" { 100 # define __END_DECLS } 101 #else 102 # define __BEGIN_DECLS 103 # define __END_DECLS 104 #endif 105 106 107 /* The standard library needs the functions from the ISO C90 standard 108 in the std namespace. At the same time we want to be safe for 109 future changes and we include the ISO C99 code in the non-standard 110 namespace __c99. The C++ wrapper header take case of adding the 111 definitions to the global namespace. */ 112 #if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES 113 # define __BEGIN_NAMESPACE_STD namespace std { 114 # define __END_NAMESPACE_STD } 115 # define __USING_NAMESPACE_STD(name) using std::name; 116 # define __BEGIN_NAMESPACE_C99 namespace __c99 { 117 # define __END_NAMESPACE_C99 } 118 # define __USING_NAMESPACE_C99(name) using __c99::name; 119 #else 120 /* For compatibility we do not add the declarations into any 121 namespace. They will end up in the global namespace which is what 122 old code expects. */ 123 # define __BEGIN_NAMESPACE_STD 124 # define __END_NAMESPACE_STD 125 # define __USING_NAMESPACE_STD(name) 126 # define __BEGIN_NAMESPACE_C99 127 # define __END_NAMESPACE_C99 128 # define __USING_NAMESPACE_C99(name) 129 #endif 130 131 132 /* Support for bounded pointers. */ 133 #ifndef __BOUNDED_POINTERS__ 134 # define __bounded /* nothing */ 135 # define __unbounded /* nothing */ 136 # define __ptrvalue /* nothing */ 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 #define __fortify_function __extern_always_inline __attribute_artificial__ 144 145 #if __GNUC_PREREQ (4,3) 146 # define __warndecl(name, msg) \ 147 extern void name (void) __attribute__((__warning__ (msg))) 148 # define __warnattr(msg) __attribute__((__warning__ (msg))) 149 # define __errordecl(name, msg) \ 150 extern void name (void) __attribute__((__error__ (msg))) 151 #else 152 # define __warndecl(name, msg) extern void name (void) 153 # define __warnattr(msg) 154 # define __errordecl(name, msg) extern void name (void) 155 #endif 156 157 /* Support for flexible arrays. */ 158 #if __GNUC_PREREQ (2,97) 159 /* GCC 2.97 supports C99 flexible array members. */ 160 # define __flexarr [] 161 #else 162 # ifdef __GNUC__ 163 # define __flexarr [0] 164 # else 165 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 166 # define __flexarr [] 167 # else 168 /* Some other non-C99 compiler. Approximate with [1]. */ 169 # define __flexarr [1] 170 # endif 171 # endif 172 #endif 173 174 175 /* __asm__ ("xyz") is used throughout the headers to rename functions 176 at the assembly language level. This is wrapped by the __REDIRECT 177 macro, in order to support compilers that can do this some other 178 way. When compilers don't support asm-names at all, we have to do 179 preprocessor tricks instead (which don't have exactly the right 180 semantics, but it's the best we can do). 181 182 Example: 183 int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ 184 185 #if defined __GNUC__ && __GNUC__ >= 2 186 187 # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) 188 # ifdef __cplusplus 189 # define __REDIRECT_NTH(name, proto, alias) \ 190 name proto __THROW __asm__ (__ASMNAME (#alias)) 191 # define __REDIRECT_NTHNL(name, proto, alias) \ 192 name proto __THROWNL __asm__ (__ASMNAME (#alias)) 193 # else 194 # define __REDIRECT_NTH(name, proto, alias) \ 195 name proto __asm__ (__ASMNAME (#alias)) __THROW 196 # define __REDIRECT_NTHNL(name, proto, alias) \ 197 name proto __asm__ (__ASMNAME (#alias)) __THROWNL 198 # endif 199 # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) 200 # define __ASMNAME2(prefix, cname) __STRING (prefix) cname 201 202 /* 203 #elif __SOME_OTHER_COMPILER__ 204 205 # define __REDIRECT(name, proto, alias) name proto; \ 206 _Pragma("let " #name " = " #alias) 207 */ 208 #endif 209 210 /* GCC has various useful declarations that can be made with the 211 `__attribute__' syntax. All of the ways we use this do fine if 212 they are omitted for compilers that don't understand it. */ 213 #if !defined __GNUC__ || __GNUC__ < 2 214 # define __attribute__(xyz) /* Ignore */ 215 #endif 216 217 /* At some point during the gcc 2.96 development the `malloc' attribute 218 for functions was introduced. We don't want to use it unconditionally 219 (although this would be possible) since it generates warnings. */ 220 #if __GNUC_PREREQ (2,96) 221 # define __attribute_malloc__ __attribute__ ((__malloc__)) 222 #else 223 # define __attribute_malloc__ /* Ignore */ 224 #endif 225 226 /* At some point during the gcc 2.96 development the `pure' attribute 227 for functions was introduced. We don't want to use it unconditionally 228 (although this would be possible) since it generates warnings. */ 229 #if __GNUC_PREREQ (2,96) 230 # define __attribute_pure__ __attribute__ ((__pure__)) 231 #else 232 # define __attribute_pure__ /* Ignore */ 233 #endif 234 235 /* This declaration tells the compiler that the value is constant. */ 236 #if __GNUC_PREREQ (2,5) 237 # define __attribute_const__ __attribute__ ((__const__)) 238 #else 239 # define __attribute_const__ /* Ignore */ 240 #endif 241 242 /* At some point during the gcc 3.1 development the `used' attribute 243 for functions was introduced. We don't want to use it unconditionally 244 (although this would be possible) since it generates warnings. */ 245 #if __GNUC_PREREQ (3,1) 246 # define __attribute_used__ __attribute__ ((__used__)) 247 # define __attribute_noinline__ __attribute__ ((__noinline__)) 248 #else 249 # define __attribute_used__ __attribute__ ((__unused__)) 250 # define __attribute_noinline__ /* Ignore */ 251 #endif 252 253 /* gcc allows marking deprecated functions. */ 254 #if __GNUC_PREREQ (3,2) 255 # define __attribute_deprecated__ __attribute__ ((__deprecated__)) 256 #else 257 # define __attribute_deprecated__ /* Ignore */ 258 #endif 259 260 /* At some point during the gcc 2.8 development the `format_arg' attribute 261 for functions was introduced. We don't want to use it unconditionally 262 (although this would be possible) since it generates warnings. 263 If several `format_arg' attributes are given for the same function, in 264 gcc-3.0 and older, all but the last one are ignored. In newer gccs, 265 all designated arguments are considered. */ 266 #if __GNUC_PREREQ (2,8) 267 # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) 268 #else 269 # define __attribute_format_arg__(x) /* Ignore */ 270 #endif 271 272 /* At some point during the gcc 2.97 development the `strfmon' format 273 attribute for functions was introduced. We don't want to use it 274 unconditionally (although this would be possible) since it 275 generates warnings. */ 276 #if __GNUC_PREREQ (2,97) 277 # define __attribute_format_strfmon__(a,b) \ 278 __attribute__ ((__format__ (__strfmon__, a, b))) 279 #else 280 # define __attribute_format_strfmon__(a,b) /* Ignore */ 281 #endif 282 283 /* The nonull function attribute allows to mark pointer parameters which 284 must not be NULL. */ 285 #if __GNUC_PREREQ (3,3) 286 # define __nonnull(params) __attribute__ ((__nonnull__ params)) 287 #else 288 # define __nonnull(params) 289 #endif 290 291 /* If fortification mode, we warn about unused results of certain 292 function calls which can lead to problems. */ 293 #if __GNUC_PREREQ (3,4) 294 # define __attribute_warn_unused_result__ \ 295 __attribute__ ((__warn_unused_result__)) 296 # if __USE_FORTIFY_LEVEL > 0 297 # define __wur __attribute_warn_unused_result__ 298 # endif 299 #else 300 # define __attribute_warn_unused_result__ /* empty */ 301 #endif 302 #ifndef __wur 303 # define __wur /* Ignore */ 304 #endif 305 306 /* Forces a function to be always inlined. */ 307 #if __GNUC_PREREQ (3,2) 308 # define __always_inline __inline __attribute__ ((__always_inline__)) 309 #else 310 # define __always_inline __inline 311 #endif 312 313 /* Associate error messages with the source location of the call site rather 314 than with the source location inside the function. */ 315 #if __GNUC_PREREQ (4,3) 316 # define __attribute_artificial__ __attribute__ ((__artificial__)) 317 #else 318 # define __attribute_artificial__ /* Ignore */ 319 #endif 320 321 /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99 322 inline semantics, unless -fgnu89-inline is used. */ 323 #if (!defined __cplusplus || __GNUC_PREREQ (4,3) || defined __clang__) && defined __GNUC__ 324 # if defined __GNUC_STDC_INLINE__ || defined __cplusplus 325 # define __extern_inline extern __inline __attribute__ ((__gnu_inline__)) 326 # define __extern_always_inline \ 327 extern __always_inline __attribute__ ((__gnu_inline__)) 328 # else 329 # define __extern_inline extern __inline 330 # define __extern_always_inline extern __always_inline 331 # endif 332 #elif defined __GNUC__ /* C++ and GCC <4.3. */ 333 # define __extern_inline extern __inline 334 # define __extern_always_inline \ 335 extern __always_inline 336 #else /* Not GCC. */ 337 # define __extern_inline /* Ignore */ 338 # define __extern_always_inline /* Ignore */ 339 #endif 340 341 /* GCC 4.3 and above allow passing all anonymous arguments of an 342 __extern_always_inline function to some other vararg function. */ 343 #if __GNUC_PREREQ (4,3) 344 # define __va_arg_pack() __builtin_va_arg_pack () 345 # define __va_arg_pack_len() __builtin_va_arg_pack_len () 346 #endif 347 348 /* It is possible to compile containing GCC extensions even if GCC is 349 run in pedantic mode if the uses are carefully marked using the 350 `__extension__' keyword. But this is not generally available before 351 version 2.8. */ 352 #if !__GNUC_PREREQ (2,8) 353 # define __extension__ /* Ignore */ 354 #endif 355 356 /* __restrict is known in EGCS 1.2 and above. */ 357 #if !__GNUC_PREREQ (2,92) 358 # define __restrict /* Ignore */ 359 #endif 360 361 /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is 362 array_name[restrict] 363 GCC 3.1 supports this. */ 364 #if __GNUC_PREREQ (3,1) && !defined __GNUG__ 365 # define __restrict_arr __restrict 366 #else 367 # ifdef __GNUC__ 368 # define __restrict_arr /* Not supported in old GCC. */ 369 # else 370 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 371 # define __restrict_arr restrict 372 # else 373 /* Some other non-C99 compiler. */ 374 # define __restrict_arr /* Not supported. */ 375 # endif 376 # endif 377 #endif 378 379 #if __GNUC__ >= 3 380 # define __glibc_unlikely(cond) __builtin_expect((cond), 0) 381 #else 382 # define __glibc_unlikely(cond) (cond) 383 #endif 384 385 #include <bits/wordsize.h> 386 387 #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH 388 # define __LDBL_COMPAT 1 389 # ifdef __REDIRECT 390 # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias) 391 # define __LDBL_REDIR(name, proto) \ 392 __LDBL_REDIR1 (name, proto, __nldbl_##name) 393 # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias) 394 # define __LDBL_REDIR_NTH(name, proto) \ 395 __LDBL_REDIR1_NTH (name, proto, __nldbl_##name) 396 # define __LDBL_REDIR1_DECL(name, alias) \ 397 extern __typeof (name) name __asm (__ASMNAME (#alias)); 398 # define __LDBL_REDIR_DECL(name) \ 399 extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name)); 400 # define __REDIRECT_LDBL(name, proto, alias) \ 401 __LDBL_REDIR1 (name, proto, __nldbl_##alias) 402 # define __REDIRECT_NTH_LDBL(name, proto, alias) \ 403 __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias) 404 # endif 405 #endif 406 #if !defined __LDBL_COMPAT || !defined __REDIRECT 407 # define __LDBL_REDIR1(name, proto, alias) name proto 408 # define __LDBL_REDIR(name, proto) name proto 409 # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW 410 # define __LDBL_REDIR_NTH(name, proto) name proto __THROW 411 # define __LDBL_REDIR_DECL(name) 412 # ifdef __REDIRECT 413 # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias) 414 # define __REDIRECT_NTH_LDBL(name, proto, alias) \ 415 __REDIRECT_NTH (name, proto, alias) 416 # endif 417 #endif 418 419 #endif /* sys/cdefs.h */ 420