1 /* Copyright (C) 1992-2013 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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 <http://www.gnu.org/licenses/>. */
19 #define _SYS_CDEFS_H 1
21 /* We are almost always included from features.h. */
23 # include <features.h>
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
29 #if defined __GNUC__ && !defined __STDC__
30 # error "You need a ISO C conforming compiler to use the glibc headers"
33 /* Some user header file might have defined this before. */
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__))
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
59 # if defined __cplusplus && __GNUC_PREREQ (2,8)
60 # define __THROW throw ()
61 # define __THROWNL throw ()
62 # define __NTH(fct) __LEAF_ATTR fct throw ()
66 # define __NTH(fct) fct
72 # define __inline /* No inline functions. */
76 # define __NTH(fct) fct
80 /* These two macros are not used in glibc anymore. They are kept here
81 only because some other projects expect the macros to be defined. */
82 #define __P(args) args
83 #define __PMT(args) args
85 /* For these things, GCC behaves the ANSI way normally,
86 and the non-ANSI way under -traditional. */
88 #define __CONCAT(x,y) x ## y
89 #define __STRING(x) #x
91 /* This is not a typedef so `const __ptr_t' does the right thing. */
92 #define __ptr_t void *
93 #define __long_double_t long double
96 /* C++ needs to know that types and declarations are C, not C++. */
98 # define __BEGIN_DECLS extern "C" {
99 # define __END_DECLS }
101 # define __BEGIN_DECLS
106 /* The standard library needs the functions from the ISO C90 standard
107 in the std namespace. At the same time we want to be safe for
108 future changes and we include the ISO C99 code in the non-standard
109 namespace __c99. The C++ wrapper header take case of adding the
110 definitions to the global namespace. */
111 #if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES
112 # define __BEGIN_NAMESPACE_STD namespace std {
113 # define __END_NAMESPACE_STD }
114 # define __USING_NAMESPACE_STD(name) using std::name;
115 # define __BEGIN_NAMESPACE_C99 namespace __c99 {
116 # define __END_NAMESPACE_C99 }
117 # define __USING_NAMESPACE_C99(name) using __c99::name;
119 /* For compatibility we do not add the declarations into any
120 namespace. They will end up in the global namespace which is what
122 # define __BEGIN_NAMESPACE_STD
123 # define __END_NAMESPACE_STD
124 # define __USING_NAMESPACE_STD(name)
125 # define __BEGIN_NAMESPACE_C99
126 # define __END_NAMESPACE_C99
127 # define __USING_NAMESPACE_C99(name)
131 /* Support for bounded pointers. */
132 #ifndef __BOUNDED_POINTERS__
133 # define __bounded /* nothing */
134 # define __unbounded /* nothing */
135 # define __ptrvalue /* nothing */
139 /* Fortify support. */
140 #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
141 #define __bos0(ptr) __builtin_object_size (ptr, 0)
142 #define __fortify_function __extern_always_inline __attribute_artificial__
144 #if __GNUC_PREREQ (4,3)
145 # define __warndecl(name, msg) \
146 extern void name (void) __attribute__((__warning__ (msg)))
147 # define __warnattr(msg) __attribute__((__warning__ (msg)))
148 # define __errordecl(name, msg) \
149 extern void name (void) __attribute__((__error__ (msg)))
151 # define __warndecl(name, msg) extern void name (void)
152 # define __warnattr(msg)
153 # define __errordecl(name, msg) extern void name (void)
156 /* Support for flexible arrays. */
157 #if __GNUC_PREREQ (2,97)
158 /* GCC 2.97 supports C99 flexible array members. */
159 # define __flexarr []
162 # define __flexarr [0]
164 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
165 # define __flexarr []
167 /* Some other non-C99 compiler. Approximate with [1]. */
168 # define __flexarr [1]
174 /* __asm__ ("xyz") is used throughout the headers to rename functions
175 at the assembly language level. This is wrapped by the __REDIRECT
176 macro, in order to support compilers that can do this some other
177 way. When compilers don't support asm-names at all, we have to do
178 preprocessor tricks instead (which don't have exactly the right
179 semantics, but it's the best we can do).
182 int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
184 #if defined __GNUC__ && __GNUC__ >= 2
186 # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
188 # define __REDIRECT_NTH(name, proto, alias) \
189 name proto __THROW __asm__ (__ASMNAME (#alias))
190 # define __REDIRECT_NTHNL(name, proto, alias) \
191 name proto __THROWNL __asm__ (__ASMNAME (#alias))
193 # define __REDIRECT_NTH(name, proto, alias) \
194 name proto __asm__ (__ASMNAME (#alias)) __THROW
195 # define __REDIRECT_NTHNL(name, proto, alias) \
196 name proto __asm__ (__ASMNAME (#alias)) __THROWNL
198 # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
199 # define __ASMNAME2(prefix, cname) __STRING (prefix) cname
202 #elif __SOME_OTHER_COMPILER__
204 # define __REDIRECT(name, proto, alias) name proto; \
205 _Pragma("let " #name " = " #alias)
209 /* GCC has various useful declarations that can be made with the
210 `__attribute__' syntax. All of the ways we use this do fine if
211 they are omitted for compilers that don't understand it. */
212 #if !defined __GNUC__ || __GNUC__ < 2
213 # define __attribute__(xyz) /* Ignore */
216 /* At some point during the gcc 2.96 development the `malloc' attribute
217 for functions was introduced. We don't want to use it unconditionally
218 (although this would be possible) since it generates warnings. */
219 #if __GNUC_PREREQ (2,96)
220 # define __attribute_malloc__ __attribute__ ((__malloc__))
222 # define __attribute_malloc__ /* Ignore */
225 /* At some point during the gcc 2.96 development the `pure' attribute
226 for functions was introduced. We don't want to use it unconditionally
227 (although this would be possible) since it generates warnings. */
228 #if __GNUC_PREREQ (2,96)
229 # define __attribute_pure__ __attribute__ ((__pure__))
231 # define __attribute_pure__ /* Ignore */
234 /* This declaration tells the compiler that the value is constant. */
235 #if __GNUC_PREREQ (2,5)
236 # define __attribute_const__ __attribute__ ((__const__))
238 # define __attribute_const__ /* Ignore */
241 /* At some point during the gcc 3.1 development the `used' attribute
242 for functions was introduced. We don't want to use it unconditionally
243 (although this would be possible) since it generates warnings. */
244 #if __GNUC_PREREQ (3,1)
245 # define __attribute_used__ __attribute__ ((__used__))
246 # define __attribute_noinline__ __attribute__ ((__noinline__))
248 # define __attribute_used__ __attribute__ ((__unused__))
249 # define __attribute_noinline__ /* Ignore */
252 /* gcc allows marking deprecated functions. */
253 #if __GNUC_PREREQ (3,2)
254 # define __attribute_deprecated__ __attribute__ ((__deprecated__))
256 # define __attribute_deprecated__ /* Ignore */
259 /* At some point during the gcc 2.8 development the `format_arg' attribute
260 for functions was introduced. We don't want to use it unconditionally
261 (although this would be possible) since it generates warnings.
262 If several `format_arg' attributes are given for the same function, in
263 gcc-3.0 and older, all but the last one are ignored. In newer gccs,
264 all designated arguments are considered. */
265 #if __GNUC_PREREQ (2,8)
266 # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
268 # define __attribute_format_arg__(x) /* Ignore */
271 /* At some point during the gcc 2.97 development the `strfmon' format
272 attribute for functions was introduced. We don't want to use it
273 unconditionally (although this would be possible) since it
274 generates warnings. */
275 #if __GNUC_PREREQ (2,97)
276 # define __attribute_format_strfmon__(a,b) \
277 __attribute__ ((__format__ (__strfmon__, a, b)))
279 # define __attribute_format_strfmon__(a,b) /* Ignore */
282 /* The nonull function attribute allows to mark pointer parameters which
284 #if __GNUC_PREREQ (3,3)
285 # define __nonnull(params) __attribute__ ((__nonnull__ params))
287 # define __nonnull(params)
290 /* If fortification mode, we warn about unused results of certain
291 function calls which can lead to problems. */
292 #if __GNUC_PREREQ (3,4)
293 # define __attribute_warn_unused_result__ \
294 __attribute__ ((__warn_unused_result__))
295 # if __USE_FORTIFY_LEVEL > 0
296 # define __wur __attribute_warn_unused_result__
299 # define __attribute_warn_unused_result__ /* empty */
302 # define __wur /* Ignore */
305 /* Forces a function to be always inlined. */
306 #if __GNUC_PREREQ (3,2)
307 # define __always_inline __inline __attribute__ ((__always_inline__))
309 # define __always_inline __inline
312 /* Associate error messages with the source location of the call site rather
313 than with the source location inside the function. */
314 #if __GNUC_PREREQ (4,3)
315 # define __attribute_artificial__ __attribute__ ((__artificial__))
317 # define __attribute_artificial__ /* Ignore */
320 /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
321 inline semantics, unless -fgnu89-inline is used. */
322 #if (!defined __cplusplus || __GNUC_PREREQ (4,3)) && defined __GNUC__
323 # if defined __GNUC_STDC_INLINE__ || defined __cplusplus
324 # define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
325 # define __extern_always_inline \
326 extern __always_inline __attribute__ ((__gnu_inline__))
328 # define __extern_inline extern __inline
329 # define __extern_always_inline extern __always_inline
331 #elif defined __GNUC__ /* C++ and GCC <4.3. */
332 # define __extern_inline extern __inline
333 # define __extern_always_inline \
334 extern __always_inline
336 # define __extern_inline /* Ignore */
337 # define __extern_always_inline /* Ignore */
340 /* GCC 4.3 and above allow passing all anonymous arguments of an
341 __extern_always_inline function to some other vararg function. */
342 #if __GNUC_PREREQ (4,3)
343 # define __va_arg_pack() __builtin_va_arg_pack ()
344 # define __va_arg_pack_len() __builtin_va_arg_pack_len ()
347 /* It is possible to compile containing GCC extensions even if GCC is
348 run in pedantic mode if the uses are carefully marked using the
349 `__extension__' keyword. But this is not generally available before
351 #if !__GNUC_PREREQ (2,8)
352 # define __extension__ /* Ignore */
355 /* __restrict is known in EGCS 1.2 and above. */
356 #if !__GNUC_PREREQ (2,92)
357 # define __restrict /* Ignore */
360 /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is
362 GCC 3.1 supports this. */
363 #if __GNUC_PREREQ (3,1) && !defined __GNUG__
364 # define __restrict_arr __restrict
367 # define __restrict_arr /* Not supported in old GCC. */
369 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
370 # define __restrict_arr restrict
372 /* Some other non-C99 compiler. */
373 # define __restrict_arr /* Not supported. */
379 # define __glibc_unlikely(cond) __builtin_expect ((cond), 0)
380 # define __glibc_likely(cond) __builtin_expect ((cond), 1)
382 # define __glibc_unlikely(cond) (cond)
383 # define __glibc_likely(cond) (cond)
386 #include <bits/wordsize.h>
388 #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
389 # define __LDBL_COMPAT 1
391 # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias)
392 # define __LDBL_REDIR(name, proto) \
393 __LDBL_REDIR1 (name, proto, __nldbl_##name)
394 # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias)
395 # define __LDBL_REDIR_NTH(name, proto) \
396 __LDBL_REDIR1_NTH (name, proto, __nldbl_##name)
397 # define __LDBL_REDIR1_DECL(name, alias) \
398 extern __typeof (name) name __asm (__ASMNAME (#alias));
399 # define __LDBL_REDIR_DECL(name) \
400 extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name));
401 # define __REDIRECT_LDBL(name, proto, alias) \
402 __LDBL_REDIR1 (name, proto, __nldbl_##alias)
403 # define __REDIRECT_NTH_LDBL(name, proto, alias) \
404 __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias)
407 #if !defined __LDBL_COMPAT || !defined __REDIRECT
408 # define __LDBL_REDIR1(name, proto, alias) name proto
409 # define __LDBL_REDIR(name, proto) name proto
410 # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW
411 # define __LDBL_REDIR_NTH(name, proto) name proto __THROW
412 # define __LDBL_REDIR_DECL(name)
414 # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias)
415 # define __REDIRECT_NTH_LDBL(name, proto, alias) \
416 __REDIRECT_NTH (name, proto, alias)
420 #endif /* sys/cdefs.h */