1 /* Copyright (C) 1992-2001, 2002, 2004, 2005, 2006, 2007 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, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 #ifndef _SYS_CDEFS_H 21 #define _SYS_CDEFS_H 1 22 23 /* We are almost always included from features.h. */ 24 #ifndef _FEATURES_H 25 # include <features.h> 26 #endif 27 28 /* The GNU libc does not support any K&R compilers or the traditional mode 29 of ISO C compilers anymore. Check for some of the combinations not 30 anymore supported. */ 31 #if defined __GNUC__ && !defined __STDC__ 32 # error "You need a ISO C conforming compiler to use the glibc headers" 33 #endif 34 35 /* Some user header file might have defined this before. */ 36 #undef __P 37 #undef __PMT 38 39 #ifdef __GNUC__ 40 41 /* GCC can always grok prototypes. For C++ programs we add throw() 42 to help it optimize the function calls. But this works only with 43 gcc 2.8.x and egcs. For gcc 3.2 and up we even mark C functions 44 as non-throwing using a function attribute since programs can use 45 the -fexceptions options for C code as well. */ 46 # if !defined __cplusplus && __GNUC_PREREQ (3, 3) 47 # define __THROW __attribute__ ((__nothrow__)) 48 # define __NTH(fct) __attribute__ ((__nothrow__)) fct 49 # else 50 # if defined __cplusplus && __GNUC_PREREQ (2,8) 51 # define __THROW throw () 52 # define __NTH(fct) fct throw () 53 # else 54 # define __THROW 55 # define __NTH(fct) fct 56 # endif 57 # endif 58 59 #else /* Not GCC. */ 60 61 # define __inline /* No inline functions. */ 62 63 # define __THROW 64 # define __NTH(fct) fct 65 66 # define __const const 67 # define __signed signed 68 # define __volatile volatile 69 70 #endif /* GCC. */ 71 72 /* These two macros are not used in glibc anymore. They are kept here 73 only because some other projects expect the macros to be defined. */ 74 #define __P(args) args 75 #define __PMT(args) args 76 77 /* For these things, GCC behaves the ANSI way normally, 78 and the non-ANSI way under -traditional. */ 79 80 #define __CONCAT(x,y) x ## y 81 #define __STRING(x) #x 82 83 /* This is not a typedef so `const __ptr_t' does the right thing. */ 84 #define __ptr_t void * 85 #define __long_double_t long double 86 87 88 /* C++ needs to know that types and declarations are C, not C++. */ 89 #ifdef __cplusplus 90 # define __BEGIN_DECLS extern "C" { 91 # define __END_DECLS } 92 #else 93 # define __BEGIN_DECLS 94 # define __END_DECLS 95 #endif 96 97 98 /* The standard library needs the functions from the ISO C90 standard 99 in the std namespace. At the same time we want to be safe for 100 future changes and we include the ISO C99 code in the non-standard 101 namespace __c99. The C++ wrapper header take case of adding the 102 definitions to the global namespace. */ 103 #if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES 104 # define __BEGIN_NAMESPACE_STD namespace std { 105 # define __END_NAMESPACE_STD } 106 # define __USING_NAMESPACE_STD(name) using std::name; 107 # define __BEGIN_NAMESPACE_C99 namespace __c99 { 108 # define __END_NAMESPACE_C99 } 109 # define __USING_NAMESPACE_C99(name) using __c99::name; 110 #else 111 /* For compatibility we do not add the declarations into any 112 namespace. They will end up in the global namespace which is what 113 old code expects. */ 114 # define __BEGIN_NAMESPACE_STD 115 # define __END_NAMESPACE_STD 116 # define __USING_NAMESPACE_STD(name) 117 # define __BEGIN_NAMESPACE_C99 118 # define __END_NAMESPACE_C99 119 # define __USING_NAMESPACE_C99(name) 120 #endif 121 122 123 /* Support for bounded pointers. */ 124 #ifndef __BOUNDED_POINTERS__ 125 # define __bounded /* nothing */ 126 # define __unbounded /* nothing */ 127 # define __ptrvalue /* nothing */ 128 #endif 129 130 131 /* Fortify support. */ 132 #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1) 133 #define __bos0(ptr) __builtin_object_size (ptr, 0) 134 135 #if __GNUC_PREREQ (4,3) 136 # define __warndecl(name, msg) \ 137 extern void name (void) __attribute__((__warning__ (msg))) 138 # define __warnattr(msg) __attribute__((__warning__ (msg))) 139 # define __errordecl(name, msg) \ 140 extern void name (void) __attribute__((__error__ (msg))) 141 #else 142 # define __warndecl(name, msg) extern void name (void) 143 # define __warnattr(msg) 144 # define __errordecl(name, msg) extern void name (void) 145 #endif 146 147 /* Support for flexible arrays. */ 148 #if __GNUC_PREREQ (2,97) 149 /* GCC 2.97 supports C99 flexible array members. */ 150 # define __flexarr [] 151 #else 152 # ifdef __GNUC__ 153 # define __flexarr [0] 154 # else 155 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 156 # define __flexarr [] 157 # else 158 /* Some other non-C99 compiler. Approximate with [1]. */ 159 # define __flexarr [1] 160 # endif 161 # endif 162 #endif 163 164 165 /* __asm__ ("xyz") is used throughout the headers to rename functions 166 at the assembly language level. This is wrapped by the __REDIRECT 167 macro, in order to support compilers that can do this some other 168 way. When compilers don't support asm-names at all, we have to do 169 preprocessor tricks instead (which don't have exactly the right 170 semantics, but it's the best we can do). 171 172 Example: 173 int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ 174 175 #if defined __GNUC__ && __GNUC__ >= 2 176 177 # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) 178 # ifdef __cplusplus 179 # define __REDIRECT_NTH(name, proto, alias) \ 180 name proto __THROW __asm__ (__ASMNAME (#alias)) 181 # else 182 # define __REDIRECT_NTH(name, proto, alias) \ 183 name proto __asm__ (__ASMNAME (#alias)) __THROW 184 # endif 185 # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) 186 # define __ASMNAME2(prefix, cname) __STRING (prefix) cname 187 188 /* 189 #elif __SOME_OTHER_COMPILER__ 190 191 # define __REDIRECT(name, proto, alias) name proto; \ 192 _Pragma("let " #name " = " #alias) 193 */ 194 #endif 195 196 /* GCC has various useful declarations that can be made with the 197 `__attribute__' syntax. All of the ways we use this do fine if 198 they are omitted for compilers that don't understand it. */ 199 #if !defined __GNUC__ || __GNUC__ < 2 200 # define __attribute__(xyz) /* Ignore */ 201 #endif 202 203 /* At some point during the gcc 2.96 development the `malloc' attribute 204 for functions was introduced. We don't want to use it unconditionally 205 (although this would be possible) since it generates warnings. */ 206 #if __GNUC_PREREQ (2,96) 207 # define __attribute_malloc__ __attribute__ ((__malloc__)) 208 #else 209 # define __attribute_malloc__ /* Ignore */ 210 #endif 211 212 /* At some point during the gcc 2.96 development the `pure' attribute 213 for functions was introduced. We don't want to use it unconditionally 214 (although this would be possible) since it generates warnings. */ 215 #if __GNUC_PREREQ (2,96) 216 # define __attribute_pure__ __attribute__ ((__pure__)) 217 #else 218 # define __attribute_pure__ /* Ignore */ 219 #endif 220 221 /* At some point during the gcc 3.1 development the `used' attribute 222 for functions was introduced. We don't want to use it unconditionally 223 (although this would be possible) since it generates warnings. */ 224 #if __GNUC_PREREQ (3,1) 225 # define __attribute_used__ __attribute__ ((__used__)) 226 # define __attribute_noinline__ __attribute__ ((__noinline__)) 227 #else 228 # define __attribute_used__ __attribute__ ((__unused__)) 229 # define __attribute_noinline__ /* Ignore */ 230 #endif 231 232 /* gcc allows marking deprecated functions. */ 233 #if __GNUC_PREREQ (3,2) 234 # define __attribute_deprecated__ __attribute__ ((__deprecated__)) 235 #else 236 # define __attribute_deprecated__ /* Ignore */ 237 #endif 238 239 /* At some point during the gcc 2.8 development the `format_arg' attribute 240 for functions was introduced. We don't want to use it unconditionally 241 (although this would be possible) since it generates warnings. 242 If several `format_arg' attributes are given for the same function, in 243 gcc-3.0 and older, all but the last one are ignored. In newer gccs, 244 all designated arguments are considered. */ 245 #if __GNUC_PREREQ (2,8) 246 # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) 247 #else 248 # define __attribute_format_arg__(x) /* Ignore */ 249 #endif 250 251 /* At some point during the gcc 2.97 development the `strfmon' format 252 attribute for functions was introduced. We don't want to use it 253 unconditionally (although this would be possible) since it 254 generates warnings. */ 255 #if __GNUC_PREREQ (2,97) 256 # define __attribute_format_strfmon__(a,b) \ 257 __attribute__ ((__format__ (__strfmon__, a, b))) 258 #else 259 # define __attribute_format_strfmon__(a,b) /* Ignore */ 260 #endif 261 262 /* The nonull function attribute allows to mark pointer parameters which 263 must not be NULL. */ 264 #if __GNUC_PREREQ (3,3) 265 # define __nonnull(params) __attribute__ ((__nonnull__ params)) 266 #else 267 # define __nonnull(params) 268 #endif 269 270 /* If fortification mode, we warn about unused results of certain 271 function calls which can lead to problems. */ 272 #if __GNUC_PREREQ (3,4) 273 # define __attribute_warn_unused_result__ \ 274 __attribute__ ((__warn_unused_result__)) 275 # if __USE_FORTIFY_LEVEL > 0 276 # define __wur __attribute_warn_unused_result__ 277 # endif 278 #else 279 # define __attribute_warn_unused_result__ /* empty */ 280 #endif 281 #ifndef __wur 282 # define __wur /* Ignore */ 283 #endif 284 285 /* Forces a function to be always inlined. */ 286 #if __GNUC_PREREQ (3,2) 287 # define __always_inline __inline __attribute__ ((__always_inline__)) 288 #else 289 # define __always_inline __inline 290 #endif 291 292 /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99 293 inline semantics, unless -fgnu89-inline is used. */ 294 #if !defined __cplusplus || __GNUC_PREREQ (4,3) 295 # if defined __GNUC_STDC_INLINE__ || defined __cplusplus 296 # define __extern_inline extern __inline __attribute__ ((__gnu_inline__)) 297 # if __GNUC_PREREQ (4,3) 298 # define __extern_always_inline \ 299 extern __always_inline __attribute__ ((__gnu_inline__, __artificial__)) 300 # else 301 # define __extern_always_inline \ 302 extern __always_inline __attribute__ ((__gnu_inline__)) 303 # endif 304 # else 305 # define __extern_inline extern __inline 306 # define __extern_always_inline extern __always_inline 307 # endif 308 #endif 309 310 /* GCC 4.3 and above allow passing all anonymous arguments of an 311 __extern_always_inline function to some other vararg function. */ 312 #if __GNUC_PREREQ (4,3) 313 # define __va_arg_pack() __builtin_va_arg_pack () 314 # define __va_arg_pack_len() __builtin_va_arg_pack_len () 315 #endif 316 317 /* It is possible to compile containing GCC extensions even if GCC is 318 run in pedantic mode if the uses are carefully marked using the 319 `__extension__' keyword. But this is not generally available before 320 version 2.8. */ 321 #if !__GNUC_PREREQ (2,8) 322 # define __extension__ /* Ignore */ 323 #endif 324 325 /* __restrict is known in EGCS 1.2 and above. */ 326 #if !__GNUC_PREREQ (2,92) 327 # define __restrict /* Ignore */ 328 #endif 329 330 /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is 331 array_name[restrict] 332 GCC 3.1 supports this. */ 333 #if __GNUC_PREREQ (3,1) && !defined __GNUG__ 334 # define __restrict_arr __restrict 335 #else 336 # ifdef __GNUC__ 337 # define __restrict_arr /* Not supported in old GCC. */ 338 # else 339 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 340 # define __restrict_arr restrict 341 # else 342 /* Some other non-C99 compiler. */ 343 # define __restrict_arr /* Not supported. */ 344 # endif 345 # endif 346 #endif 347 348 #include <bits/wordsize.h> 349 350 #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH 351 # define __LDBL_COMPAT 1 352 # ifdef __REDIRECT 353 # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias) 354 # define __LDBL_REDIR(name, proto) \ 355 __LDBL_REDIR1 (name, proto, __nldbl_##name) 356 # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias) 357 # define __LDBL_REDIR_NTH(name, proto) \ 358 __LDBL_REDIR1_NTH (name, proto, __nldbl_##name) 359 # define __LDBL_REDIR1_DECL(name, alias) \ 360 extern __typeof (name) name __asm (__ASMNAME (#alias)); 361 # define __LDBL_REDIR_DECL(name) \ 362 extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name)); 363 # define __REDIRECT_LDBL(name, proto, alias) \ 364 __LDBL_REDIR1 (name, proto, __nldbl_##alias) 365 # define __REDIRECT_NTH_LDBL(name, proto, alias) \ 366 __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias) 367 # endif 368 #endif 369 #if !defined __LDBL_COMPAT || !defined __REDIRECT 370 # define __LDBL_REDIR1(name, proto, alias) name proto 371 # define __LDBL_REDIR(name, proto) name proto 372 # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW 373 # define __LDBL_REDIR_NTH(name, proto) name proto __THROW 374 # define __LDBL_REDIR_DECL(name) 375 # ifdef __REDIRECT 376 # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias) 377 # define __REDIRECT_NTH_LDBL(name, proto, alias) \ 378 __REDIRECT_NTH (name, proto, alias) 379 # endif 380 #endif 381 382 #endif /* sys/cdefs.h */ 383