1 /* Copyright (C) 1992-2001, 2002, 2004 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, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 #define _SYS_CDEFS_H 1
22 /* We are almost always included from features.h. */
24 # include <features.h>
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
30 #if defined __GNUC__ && !defined __STDC__
31 # error "You need a ISO C conforming compiler to use the glibc headers"
34 /* Some user header file might have defined this before. */
40 /* GCC can always grok prototypes. For C++ programs we add throw()
41 to help it optimize the function calls. But this works only with
42 gcc 2.8.x and egcs. For gcc 3.2 and up we even mark C functions
43 as non-throwing using a function attribute since programs can use
44 the -fexceptions options for C code as well. */
45 # if !defined __cplusplus && __GNUC_PREREQ (3, 3)
46 # define __THROW __attribute__ ((__nothrow__))
47 # define __NTH(fct) __attribute__ ((__nothrow__)) fct
49 # if defined __cplusplus && __GNUC_PREREQ (2,8)
50 # define __THROW throw ()
51 # define __NTH(fct) fct throw ()
54 # define __NTH(fct) fct
60 # define __inline /* No inline functions. */
63 # define __NTH(fct) fct
65 # define __const const
66 # define __signed signed
67 # define __volatile volatile
71 /* These two macros are not used in glibc anymore. They are kept here
72 only because some other projects expect the macros to be defined. */
73 #define __P(args) args
74 #define __PMT(args) args
76 /* For these things, GCC behaves the ANSI way normally,
77 and the non-ANSI way under -traditional. */
79 #define __CONCAT(x,y) x ## y
80 #define __STRING(x) #x
82 /* This is not a typedef so `const __ptr_t' does the right thing. */
83 #define __ptr_t void *
84 #define __long_double_t long double
87 /* C++ needs to know that types and declarations are C, not C++. */
89 # define __BEGIN_DECLS extern "C" {
90 # define __END_DECLS }
92 # define __BEGIN_DECLS
97 /* The standard library needs the functions from the ISO C90 standard
98 in the std namespace. At the same time we want to be safe for
99 future changes and we include the ISO C99 code in the non-standard
100 namespace __c99. The C++ wrapper header take case of adding the
101 definitions to the global namespace. */
102 #if defined __cplusplus && defined _GLIBCPP_USE_NAMESPACES
103 # define __BEGIN_NAMESPACE_STD namespace std {
104 # define __END_NAMESPACE_STD }
105 # define __USING_NAMESPACE_STD(name) using std::name;
106 # define __BEGIN_NAMESPACE_C99 namespace __c99 {
107 # define __END_NAMESPACE_C99 }
108 # define __USING_NAMESPACE_C99(name) using __c99::name;
110 /* For compatibility we do not add the declarations into any
111 namespace. They will end up in the global namespace which is what
113 # define __BEGIN_NAMESPACE_STD
114 # define __END_NAMESPACE_STD
115 # define __USING_NAMESPACE_STD(name)
116 # define __BEGIN_NAMESPACE_C99
117 # define __END_NAMESPACE_C99
118 # define __USING_NAMESPACE_C99(name)
122 /* Support for bounded pointers. */
123 #ifndef __BOUNDED_POINTERS__
124 # define __bounded /* nothing */
125 # define __unbounded /* nothing */
126 # define __ptrvalue /* nothing */
130 /* Fortify support. */
131 #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
132 #define __bos0(ptr) __builtin_object_size (ptr, 0)
135 /* Support for flexible arrays. */
136 #if __GNUC_PREREQ (2,97)
137 /* GCC 2.97 supports C99 flexible array members. */
138 # define __flexarr []
141 # define __flexarr [0]
143 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
144 # define __flexarr []
146 /* Some other non-C99 compiler. Approximate with [1]. */
147 # define __flexarr [1]
153 /* __asm__ ("xyz") is used throughout the headers to rename functions
154 at the assembly language level. This is wrapped by the __REDIRECT
155 macro, in order to support compilers that can do this some other
156 way. When compilers don't support asm-names at all, we have to do
157 preprocessor tricks instead (which don't have exactly the right
158 semantics, but it's the best we can do).
161 int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
163 #if defined __GNUC__ && __GNUC__ >= 2
165 # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
167 # define __REDIRECT_NTH(name, proto, alias) \
168 name proto __THROW __asm__ (__ASMNAME (#alias))
170 # define __REDIRECT_NTH(name, proto, alias) \
171 name proto __asm__ (__ASMNAME (#alias)) __THROW
173 # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
174 # define __ASMNAME2(prefix, cname) __STRING (prefix) cname
177 #elif __SOME_OTHER_COMPILER__
179 # define __REDIRECT(name, proto, alias) name proto; \
180 _Pragma("let " #name " = " #alias)
184 /* GCC has various useful declarations that can be made with the
185 `__attribute__' syntax. All of the ways we use this do fine if
186 they are omitted for compilers that don't understand it. */
187 #if !defined __GNUC__ || __GNUC__ < 2
188 # define __attribute__(xyz) /* Ignore */
191 /* At some point during the gcc 2.96 development the `malloc' attribute
192 for functions was introduced. We don't want to use it unconditionally
193 (although this would be possible) since it generates warnings. */
194 #if __GNUC_PREREQ (2,96)
195 # define __attribute_malloc__ __attribute__ ((__malloc__))
197 # define __attribute_malloc__ /* Ignore */
200 /* At some point during the gcc 2.96 development the `pure' attribute
201 for functions was introduced. We don't want to use it unconditionally
202 (although this would be possible) since it generates warnings. */
203 #if __GNUC_PREREQ (2,96)
204 # define __attribute_pure__ __attribute__ ((__pure__))
206 # define __attribute_pure__ /* Ignore */
209 /* At some point during the gcc 3.1 development the `used' attribute
210 for functions was introduced. We don't want to use it unconditionally
211 (although this would be possible) since it generates warnings. */
212 #if __GNUC_PREREQ (3,1)
213 # define __attribute_used__ __attribute__ ((__used__))
214 # define __attribute_noinline__ __attribute__ ((__noinline__))
216 # define __attribute_used__ __attribute__ ((__unused__))
217 # define __attribute_noinline__ /* Ignore */
220 /* gcc allows marking deprecated functions. */
221 #if __GNUC_PREREQ (3,2)
222 # define __attribute_deprecated__ __attribute__ ((__deprecated__))
224 # define __attribute_deprecated__ /* Ignore */
227 /* At some point during the gcc 2.8 development the `format_arg' attribute
228 for functions was introduced. We don't want to use it unconditionally
229 (although this would be possible) since it generates warnings.
230 If several `format_arg' attributes are given for the same function, in
231 gcc-3.0 and older, all but the last one are ignored. In newer gccs,
232 all designated arguments are considered. */
233 #if __GNUC_PREREQ (2,8)
234 # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
236 # define __attribute_format_arg__(x) /* Ignore */
239 /* At some point during the gcc 2.97 development the `strfmon' format
240 attribute for functions was introduced. We don't want to use it
241 unconditionally (although this would be possible) since it
242 generates warnings. */
243 #if __GNUC_PREREQ (2,97)
244 # define __attribute_format_strfmon__(a,b) \
245 __attribute__ ((__format__ (__strfmon__, a, b)))
247 # define __attribute_format_strfmon__(a,b) /* Ignore */
250 /* The nonull function attribute allows to mark pointer parameters which
252 #if __GNUC_PREREQ (3,3)
253 # define __nonnull(params) __attribute__ ((__nonnull__ params))
255 # define __nonnull(params)
258 /* It is possible to compile containing GCC extensions even if GCC is
259 run in pedantic mode if the uses are carefully marked using the
260 `__extension__' keyword. But this is not generally available before
262 #if !__GNUC_PREREQ (2,8)
263 # define __extension__ /* Ignore */
266 /* __restrict is known in EGCS 1.2 and above. */
267 #if !__GNUC_PREREQ (2,92)
268 # define __restrict /* Ignore */
271 /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is
273 GCC 3.1 supports this. */
274 #if __GNUC_PREREQ (3,1) && !defined __GNUG__
275 # define __restrict_arr __restrict
278 # define __restrict_arr /* Not supported in old GCC. */
280 # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
281 # define __restrict_arr restrict
283 /* Some other non-C99 compiler. */
284 # define __restrict_arr /* Not supported. */
289 #endif /* sys/cdefs.h */