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852d75f9 | 1 | /* Copyright (C) 1992,93,94,95,96,97,98,99,2000,2001 Free Software Foundation, Inc. |
54d79e99 | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
54d79e99 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
54d79e99 UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 AJ |
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 | |
17 | 02111-1307 USA. */ | |
28f540f4 RM |
18 | |
19 | #ifndef _SYS_CDEFS_H | |
28f540f4 | 20 | #define _SYS_CDEFS_H 1 |
5107cf1d | 21 | |
a6ff34d7 UD |
22 | /* We are almost always included from features.h. */ |
23 | #ifndef _FEATURES_H | |
7688db91 UD |
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" | |
a6ff34d7 | 32 | #endif |
28f540f4 RM |
33 | |
34 | /* Some user header file might have defined this before. */ | |
35 | #undef __P | |
d112ae30 | 36 | #undef __PMT |
28f540f4 RM |
37 | |
38 | #ifdef __GNUC__ | |
39 | ||
dff14448 UD |
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. */ | |
4360eafd | 43 | # if defined __cplusplus && __GNUC_PREREQ (2,8) |
99e46354 | 44 | # define __THROW throw () |
dff14448 | 45 | # else |
99e46354 | 46 | # define __THROW |
dff14448 | 47 | # endif |
99e46354 | 48 | # define __P(args) args __THROW |
dff14448 UD |
49 | /* This macro will be used for functions which might take C++ callback |
50 | functions. */ | |
9c3a54d4 | 51 | # define __PMT(args) args |
4360eafd | 52 | |
28f540f4 RM |
53 | #else /* Not GCC. */ |
54 | ||
dfd2257a | 55 | # define __inline /* No inline functions. */ |
28f540f4 | 56 | |
9b767d19 | 57 | # define __THROW |
7f4e0e58 UD |
58 | # define __P(args) args |
59 | # define __PMT(args) args | |
28f540f4 | 60 | |
c1422e5b UD |
61 | # define __const const |
62 | # define __signed signed | |
63 | # define __volatile volatile | |
64 | ||
28f540f4 RM |
65 | #endif /* GCC. */ |
66 | ||
67 | /* For these things, GCC behaves the ANSI way normally, | |
68 | and the non-ANSI way under -traditional. */ | |
69 | ||
7f4e0e58 UD |
70 | #define __CONCAT(x,y) x ## y |
71 | #define __STRING(x) #x | |
28f540f4 RM |
72 | |
73 | /* This is not a typedef so `const __ptr_t' does the right thing. */ | |
7f4e0e58 UD |
74 | #define __ptr_t void * |
75 | #define __long_double_t long double | |
857fa1b8 RM |
76 | |
77 | ||
28f540f4 RM |
78 | /* C++ needs to know that types and declarations are C, not C++. */ |
79 | #ifdef __cplusplus | |
dfd2257a UD |
80 | # define __BEGIN_DECLS extern "C" { |
81 | # define __END_DECLS } | |
28f540f4 | 82 | #else |
dfd2257a UD |
83 | # define __BEGIN_DECLS |
84 | # define __END_DECLS | |
28f540f4 RM |
85 | #endif |
86 | ||
ab95290c UD |
87 | |
88 | /* Support for bounded pointers. */ | |
89 | #ifndef __BOUNDED_POINTERS__ | |
90 | # define __bounded /* nothing */ | |
91 | # define __unbounded /* nothing */ | |
5785c39f | 92 | # define __ptrvalue /* nothing */ |
ab95290c UD |
93 | #endif |
94 | ||
95 | ||
a1620a4c UD |
96 | /* Support for flexible arrays. */ |
97 | #if __GNUC_PREREQ (2,97) | |
98 | /* GCC 2.97 supports C99 flexible array members. */ | |
99 | # define __flexarr [] | |
100 | #else | |
101 | # ifdef __GNUC__ | |
102 | # define __flexarr [0] | |
103 | # else | |
8ab5926a | 104 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L |
a1620a4c UD |
105 | # define __flexarr [] |
106 | # else | |
107 | /* Some other non-C99 compiler. Approximate with [1]. */ | |
108 | # define __flexarr [1] | |
109 | # endif | |
110 | # endif | |
111 | #endif | |
112 | ||
113 | ||
01cad722 UD |
114 | /* __asm__ ("xyz") is used throughout the headers to rename functions |
115 | at the assembly language level. This is wrapped by the __REDIRECT | |
116 | macro, in order to support compilers that can do this some other | |
117 | way. When compilers don't support asm-names at all, we have to do | |
118 | preprocessor tricks instead (which don't have exactly the right | |
119 | semantics, but it's the best we can do). | |
120 | ||
121 | Example: | |
fbedbe9d | 122 | int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */ |
01cad722 UD |
123 | |
124 | #if defined __GNUC__ && __GNUC__ >= 2 | |
125 | ||
5408c757 UD |
126 | # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias)) |
127 | # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname) | |
128 | # define __ASMNAME2(prefix, cname) __STRING (prefix) cname | |
01cad722 UD |
129 | |
130 | /* | |
131 | #elif __SOME_OTHER_COMPILER__ | |
132 | ||
5408c757 UD |
133 | # define __REDIRECT(name, proto, alias) name proto; \ |
134 | _Pragma("let " #name " = " #alias) | |
01cad722 UD |
135 | */ |
136 | #endif | |
137 | ||
138 | /* GCC has various useful declarations that can be made with the | |
28f540f4 | 139 | `__attribute__' syntax. All of the ways we use this do fine if |
01cad722 | 140 | they are omitted for compilers that don't understand it. */ |
dfd2257a | 141 | #if !defined __GNUC__ || __GNUC__ < 2 |
e9e9b245 | 142 | # define __attribute__(xyz) /* Ignore */ |
ae177b9c UD |
143 | #endif |
144 | ||
e9e9b245 UD |
145 | /* At some point during the gcc 2.96 development the `malloc' attribute |
146 | for functions was introduced. We don't want to use it unconditionally | |
147 | (although this would be possible) since it generates warnings. */ | |
ae177b9c UD |
148 | #if __GNUC_PREREQ (2,96) |
149 | # define __attribute_malloc__ __attribute__ ((__malloc__)) | |
150 | #else | |
151 | # define __attribute_malloc__ /* Ignore */ | |
01cad722 | 152 | #endif |
2f6d1f1b | 153 | |
ca5a4c3c AJ |
154 | /* At some point during the gcc 2.96 development the `pure' attribute |
155 | for functions was introduced. We don't want to use it unconditionally | |
156 | (although this would be possible) since it generates warnings. */ | |
157 | #if __GNUC_PREREQ (2,96) | |
158 | # define __attribute_pure__ __attribute__ ((__pure__)) | |
159 | #else | |
160 | # define __attribute_pure__ /* Ignore */ | |
161 | #endif | |
162 | ||
ca8d5a5f UD |
163 | /* At some point during the gcc 2.8 development the `format_arg' attribute |
164 | for functions was introduced. We don't want to use it unconditionally | |
165 | (although this would be possible) since it generates warnings. */ | |
166 | #if __GNUC_PREREQ (2,8) | |
167 | # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x))) | |
168 | #else | |
169 | # define __attribute_format_arg__(x) /* Ignore */ | |
170 | #endif | |
171 | ||
66e23ba1 UD |
172 | /* At some point during the gcc 2.97 development the `strfmon' format |
173 | attribute for functions was introduced. We don't want to use it | |
174 | unconditionally (although this would be possible) since it | |
175 | generates warnings. */ | |
176 | #if __GNUC_PREREQ (2,97) | |
177 | # define __attribute_format_strfmon__(a,b) \ | |
178 | __attribute__ ((__format__ (__strfmon__, a, b))) | |
179 | #else | |
180 | # define __attribute_format_strfmon__(a,b) /* Ignore */ | |
181 | #endif | |
182 | ||
8325d82c UD |
183 | /* It is possible to compile containing GCC extensions even if GCC is |
184 | run in pedantic mode if the uses are carefully marked using the | |
185 | `__extension__' keyword. But this is not generally available before | |
186 | version 2.8. */ | |
4360eafd | 187 | #if !__GNUC_PREREQ (2,8) |
8325d82c | 188 | # define __extension__ /* Ignore */ |
8325d82c UD |
189 | #endif |
190 | ||
a6ff34d7 | 191 | /* __restrict is known in EGCS 1.2 and above. */ |
4360eafd | 192 | #if !__GNUC_PREREQ (2,92) |
a6ff34d7 | 193 | # define __restrict /* Ignore */ |
a6ff34d7 | 194 | #endif |
2f6d1f1b | 195 | |
98cbe360 UD |
196 | /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is |
197 | array_name[restrict] | |
b912ca11 | 198 | GCC 3.1 supports this. */ |
852d75f9 | 199 | #if __GNUC_PREREQ (3,1) && !defined __GNUG__ |
b912ca11 UD |
200 | # define __restrict_arr __restrict |
201 | #else | |
202 | # ifdef __GNUC__ | |
203 | # define __restrict_arr /* Not supported in old GCC. */ | |
204 | # else | |
205 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L | |
206 | # define __restrict_arr restrict | |
207 | # else | |
208 | /* Some other non-C99 compiler. */ | |
209 | # define __restrict_arr /* Not supported. */ | |
210 | # endif | |
211 | # endif | |
212 | #endif | |
98cbe360 | 213 | |
28f540f4 | 214 | #endif /* sys/cdefs.h */ |