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) |
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 | #endif |
333 | |
334 | /* GCC 4.3 and above allow passing all anonymous arguments of an |
335 | __extern_always_inline function to some other vararg function. */ |
336 | #if __GNUC_PREREQ (4,3) |
337 | # define __va_arg_pack() __builtin_va_arg_pack () |
338 | # define __va_arg_pack_len() __builtin_va_arg_pack_len () |
339 | #endif |
340 | |
341 | /* It is possible to compile containing GCC extensions even if GCC is |
342 | run in pedantic mode if the uses are carefully marked using the |
343 | `__extension__' keyword. But this is not generally available before |
344 | version 2.8. */ |
345 | #if !__GNUC_PREREQ (2,8) |
346 | # define __extension__ /* Ignore */ |
347 | #endif |
348 | |
349 | /* __restrict is known in EGCS 1.2 and above. */ |
350 | #if !__GNUC_PREREQ (2,92) |
351 | # define __restrict /* Ignore */ |
352 | #endif |
353 | |
354 | /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is |
355 | array_name[restrict] |
356 | GCC 3.1 supports this. */ |
357 | #if __GNUC_PREREQ (3,1) && !defined __GNUG__ |
358 | # define __restrict_arr __restrict |
359 | #else |
360 | # ifdef __GNUC__ |
361 | # define __restrict_arr /* Not supported in old GCC. */ |
362 | # else |
363 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L |
364 | # define __restrict_arr restrict |
365 | # else |
366 | /* Some other non-C99 compiler. */ |
367 | # define __restrict_arr /* Not supported. */ |
368 | # endif |
369 | # endif |
370 | #endif |
371 | |
372 | #if __GNUC__ >= 3 |
373 | # define __glibc_unlikely(cond) __builtin_expect((cond), 0) |
374 | #else |
375 | # define __glibc_unlikely(cond) (cond) |
376 | #endif |
377 | |
378 | #include <bits/wordsize.h> |
379 | |
380 | #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH |
381 | # define __LDBL_COMPAT 1 |
382 | # ifdef __REDIRECT |
383 | # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias) |
384 | # define __LDBL_REDIR(name, proto) \ |
385 | __LDBL_REDIR1 (name, proto, __nldbl_##name) |
386 | # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias) |
387 | # define __LDBL_REDIR_NTH(name, proto) \ |
388 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##name) |
389 | # define __LDBL_REDIR1_DECL(name, alias) \ |
390 | extern __typeof (name) name __asm (__ASMNAME (#alias)); |
391 | # define __LDBL_REDIR_DECL(name) \ |
392 | extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name)); |
393 | # define __REDIRECT_LDBL(name, proto, alias) \ |
394 | __LDBL_REDIR1 (name, proto, __nldbl_##alias) |
395 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ |
396 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias) |
397 | # endif |
398 | #endif |
399 | #if !defined __LDBL_COMPAT || !defined __REDIRECT |
400 | # define __LDBL_REDIR1(name, proto, alias) name proto |
401 | # define __LDBL_REDIR(name, proto) name proto |
402 | # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW |
403 | # define __LDBL_REDIR_NTH(name, proto) name proto __THROW |
404 | # define __LDBL_REDIR_DECL(name) |
405 | # ifdef __REDIRECT |
406 | # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias) |
407 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \ |
408 | __REDIRECT_NTH (name, proto, alias) |
409 | # endif |
410 | #endif |
411 | |
412 | #endif /* sys/cdefs.h */ |
413 | |