1 /* Copyright (C) 1992,93,94,95,96,97,98,99 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
20 #define _SYS_CDEFS_H 1
22 /* We are almost always included from features.h. */
27 /* Some user header file might have defined this before. */
33 /* GCC can always grok prototypes. For C++ programs we add throw()
34 to help it optimize the function calls. But this works only with
35 gcc 2.8.x and egcs. */
36 # if defined __cplusplus && __GNUC_PREREQ (2,8)
37 # define __THROW throw ()
41 # define __P(args) args __THROW
42 /* This macro will be used for functions which might take C++ callback
44 # define __PMT(args) args
48 # define __inline /* No inline functions. */
50 # if (defined __STDC__ && __STDC__) || defined __cplusplus
52 # define __P(args) args
53 # define __PMT(args) args
55 # else /* Not ANSI C or C++. */
57 # define __P(args) () /* No prototypes. */
58 # define __PMT(args) ()
60 # endif /* ANSI C or C++. */
62 # define __const const
63 # define __signed signed
64 # define __volatile volatile
68 /* For these things, GCC behaves the ANSI way normally,
69 and the non-ANSI way under -traditional. */
71 #if defined __STDC__ && __STDC__
73 # define __CONCAT(x,y) x ## y
74 # define __STRING(x) #x
76 /* This is not a typedef so `const __ptr_t' does the right thing. */
77 # define __ptr_t void *
78 # define __long_double_t long double
82 # define __CONCAT(x,y) x/**/y
83 # define __STRING(x) "x"
85 # define __ptr_t char *
86 # define __long_double_t long double
88 /* The BSD header files use the ANSI keywords unmodified (this means that
89 old programs may lose if they use the new keywords as identifiers), but
90 those names are not available under -traditional. We define them to
91 their __ versions, which are taken care of above. */
93 # define const __const
94 # define signed __signed
95 # define volatile __volatile
101 /* C++ needs to know that types and declarations are C, not C++. */
103 # define __BEGIN_DECLS extern "C" {
104 # define __END_DECLS }
106 # define __BEGIN_DECLS
110 /* __asm__ ("xyz") is used throughout the headers to rename functions
111 at the assembly language level. This is wrapped by the __REDIRECT
112 macro, in order to support compilers that can do this some other
113 way. When compilers don't support asm-names at all, we have to do
114 preprocessor tricks instead (which don't have exactly the right
115 semantics, but it's the best we can do).
118 int __REDIRECT(setpgrp, __P((__pid_t pid, __pid_t pgrp)), setpgid); */
120 #if defined __GNUC__ && __GNUC__ >= 2
122 # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
123 # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
124 # define __ASMNAME2(prefix, cname) __STRING (prefix) cname
127 #elif __SOME_OTHER_COMPILER__
129 # define __REDIRECT(name, proto, alias) name proto; \
130 _Pragma("let " #name " = " #alias)
134 /* GCC has various useful declarations that can be made with the
135 `__attribute__' syntax. All of the ways we use this do fine if
136 they are omitted for compilers that don't understand it. */
137 #if !defined __GNUC__ || __GNUC__ < 2
139 # define __attribute__(xyz) /* Ignore */
143 /* At some point during the gcc 2.96 development the `malloc' attribute
144 for functions was introduced. We don't want to use it unconditionally
145 (although this would be possible) since it generates warnings. */
146 #if __GNUC_PREREQ (2,96)
147 # define __attribute_malloc__ __attribute__ ((__malloc__))
149 # define __attribute_malloc__ /* Ignore */
152 /* It is possible to compile containing GCC extensions even if GCC is
153 run in pedantic mode if the uses are carefully marked using the
154 `__extension__' keyword. But this is not generally available before
156 #if !__GNUC_PREREQ (2,8)
157 # define __extension__ /* Ignore */
160 /* __restrict is known in EGCS 1.2 and above. */
161 #if !__GNUC_PREREQ (2,92)
162 # define __restrict /* Ignore */
165 #endif /* sys/cdefs.h */