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 #define __warndecl(name, msg) extern void name (void) 135 136 137 /* Support for flexible arrays. */ 138 #if __GNUC_PREREQ (2,97) 139 /* GCC 2.97 supports C99 flexible array members. */ 140 # define __flexarr [] 141 #else 142 # ifdef __GNUC__ 143 # define __flexarr [0] 144 # else 145 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 146 # define __flexarr [] 147 # else 148 /* Some other non-C99 compiler. Approximate with [1]. */ 149 # define __flexarr [1] 150 # endif 151 # endif 152 #endif 153 154 155 /* __asm__ ("xyz") is used throughout the headers to rename functions 156 at the assembly language level. This is wrapped by the __REDIRECT 157 macro, in order to support compilers that can do this some other 158 way. When compilers don't support asm-names at all, we have to do 159 preprocessor tricks instead (which don't have exactly the right 160 semantics, but it's the best we can do). 161 162 Example: 163 int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ 164 165 #if defined __GNUC__ && __GNUC__ >= 2 166 167 # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) 168 # ifdef __cplusplus 169 # define __REDIRECT_NTH(name, proto, alias) \ 170 name proto __THROW __asm__ (__ASMNAME (#alias)) 171 # else 172 # define __REDIRECT_NTH(name, proto, alias) \ 173 name proto __asm__ (__ASMNAME (#alias)) __THROW 174 # endif 175 # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) 176 # define __ASMNAME2(prefix, cname) __STRING (prefix) cname 177 178 /* 179 #elif __SOME_OTHER_COMPILER__ 180 181 # define __REDIRECT(name, proto, alias) name proto; \ 182 _Pragma("let " #name " = " #alias) 183 */ 184 #endif 185 186 /* GCC has various useful declarations that can be made with the 187 `__attribute__' syntax. All of the ways we use this do fine if 188 they are omitted for compilers that don't understand it. */ 189 #if !defined __GNUC__ || __GNUC__ < 2 190 # define __attribute__(xyz) /* Ignore */ 191 #endif 192 193 /* At some point during the gcc 2.96 development the `malloc' attribute 194 for functions was introduced. We don't want to use it unconditionally 195 (although this would be possible) since it generates warnings. */ 196 #if __GNUC_PREREQ (2,96) 197 # define __attribute_malloc__ __attribute__ ((__malloc__)) 198 #else 199 # define __attribute_malloc__ /* Ignore */ 200 #endif 201 202 /* At some point during the gcc 2.96 development the `pure' attribute 203 for functions was introduced. We don't want to use it unconditionally 204 (although this would be possible) since it generates warnings. */ 205 #if __GNUC_PREREQ (2,96) 206 # define __attribute_pure__ __attribute__ ((__pure__)) 207 #else 208 # define __attribute_pure__ /* Ignore */ 209 #endif 210 211 /* At some point during the gcc 3.1 development the `used' attribute 212 for functions was introduced. We don't want to use it unconditionally 213 (although this would be possible) since it generates warnings. */ 214 #if __GNUC_PREREQ (3,1) 215 # define __attribute_used__ __attribute__ ((__used__)) 216 # define __attribute_noinline__ __attribute__ ((__noinline__)) 217 #else 218 # define __attribute_used__ __attribute__ ((__unused__)) 219 # define __attribute_noinline__ /* Ignore */ 220 #endif 221 222 /* gcc allows marking deprecated functions. */ 223 #if __GNUC_PREREQ (3,2) 224 # define __attribute_deprecated__ __attribute__ ((__deprecated__)) 225 #else 226 # define __attribute_deprecated__ /* Ignore */ 227 #endif 228 229 /* At some point during the gcc 2.8 development the `format_arg' attribute 230 for functions was introduced. We don't want to use it unconditionally 231 (although this would be possible) since it generates warnings. 232 If several `format_arg' attributes are given for the same function, in 233 gcc-3.0 and older, all but the last one are ignored. In newer gccs, 234 all designated arguments are considered. */ 235 #if __GNUC_PREREQ (2,8) 236 # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) 237 #else 238 # define __attribute_format_arg__(x) /* Ignore */ 239 #endif 240 241 /* At some point during the gcc 2.97 development the `strfmon' format 242 attribute for functions was introduced. We don't want to use it 243 unconditionally (although this would be possible) since it 244 generates warnings. */ 245 #if __GNUC_PREREQ (2,97) 246 # define __attribute_format_strfmon__(a,b) \ 247 __attribute__ ((__format__ (__strfmon__, a, b))) 248 #else 249 # define __attribute_format_strfmon__(a,b) /* Ignore */ 250 #endif 251 252 /* The nonull function attribute allows to mark pointer parameters which 253 must not be NULL. */ 254 #if __GNUC_PREREQ (3,3) 255 # define __nonnull(params) __attribute__ ((__nonnull__ params)) 256 #else 257 # define __nonnull(params) 258 #endif 259 260 /* If fortification mode, we warn about unused results of certain 261 function calls which can lead to problems. */ 262 #if __GNUC_PREREQ (3,4) 263 # define __attribute_warn_unused_result__ \ 264 __attribute__ ((__warn_unused_result__)) 265 # if __USE_FORTIFY_LEVEL > 0 266 # define __wur __attribute_warn_unused_result__ 267 # endif 268 #else 269 # define __attribute_warn_unused_result__ /* empty */ 270 #endif 271 #ifndef __wur 272 # define __wur /* Ignore */ 273 #endif 274 275 /* Forces a function to be always inlined. */ 276 #if __GNUC_PREREQ (3,2) 277 # define __always_inline __inline __attribute__ ((__always_inline__)) 278 #else 279 # define __always_inline __inline 280 #endif 281 282 /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99 283 inline semantics, unless -fgnu89-inline is used. */ 284 #ifdef __GNUC_STDC_INLINE__ 285 # define __extern_inline extern __inline __attribute__ ((__gnu_inline__)) 286 # define __extern_always_inline \ 287 extern __always_inline __attribute__ ((__gnu_inline__)) 288 #else 289 # define __extern_inline extern __inline 290 # define __extern_always_inline extern __always_inline 291 #endif 292 293 /* It is possible to compile containing GCC extensions even if GCC is 294 run in pedantic mode if the uses are carefully marked using the 295 `__extension__' keyword. But this is not generally available before 296 version 2.8. */ 297 #if !__GNUC_PREREQ (2,8) 298 # define __extension__ /* Ignore */ 299 #endif 300 301 /* __restrict is known in EGCS 1.2 and above. */ 302 #if !__GNUC_PREREQ (2,92) 303 # define __restrict /* Ignore */ 304 #endif 305 306 /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is 307 array_name[restrict] 308 GCC 3.1 supports this. */ 309 #if __GNUC_PREREQ (3,1) && !defined __GNUG__ 310 # define __restrict_arr __restrict 311 #else 312 # ifdef __GNUC__ 313 # define __restrict_arr /* Not supported in old GCC. */ 314 # else 315 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L 316 # define __restrict_arr restrict 317 # else 318 /* Some other non-C99 compiler. */ 319 # define __restrict_arr /* Not supported. */ 320 # endif 321 # endif 322 #endif 323 324 #include <bits/wordsize.h> 325 326 #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH 327 # define __LDBL_COMPAT 1 328 # ifdef __REDIRECT 329 # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias) 330 # define __LDBL_REDIR(name, proto) \ 331 __LDBL_REDIR1 (name, proto, __nldbl_##name) 332 # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias) 333 # define __LDBL_REDIR_NTH(name, proto) \ 334 __LDBL_REDIR1_NTH (name, proto, __nldbl_##name) 335 # define __LDBL_REDIR1_DECL(name, alias) \ 336 extern __typeof (name) name __asm (__ASMNAME (#alias)); 337 # define __LDBL_REDIR_DECL(name) \ 338 extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name)); 339 # endif 340 #endif 341 #if !defined __LDBL_COMPAT || !defined __REDIRECT 342 # define __LDBL_REDIR1(name, proto, alias) name proto 343 # define __LDBL_REDIR(name, proto) name proto 344 # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW 345 # define __LDBL_REDIR_NTH(name, proto) name proto __THROW 346 # define __LDBL_REDIR_DECL(name) 347 #endif 348 349 #endif /* sys/cdefs.h */ 350