]>
Commit | Line | Data |
---|---|---|
d3669add | 1 | /* Copyright (C) 1991, 92, 93, 95, 96 Free Software Foundation, Inc. |
28f540f4 RM |
2 | This file is part of the GNU C Library. |
3 | ||
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. | |
8 | ||
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. | |
13 | ||
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 | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
18 | ||
19 | #ifndef _FEATURES_H | |
20 | ||
21 | #define _FEATURES_H 1 | |
22 | ||
23 | /* These are defined by the user (or the compiler) | |
24 | to specify the desired environment: | |
25 | ||
26 | __STRICT_ANSI__ ANSI Standard C. | |
27 | _POSIX_SOURCE IEEE Std 1003.1. | |
28 | _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if ==2 add IEEE Std 1003.2. | |
29 | _BSD_SOURCE ANSI, POSIX, and 4.3BSD things. | |
30 | _SVID_SOURCE ANSI, POSIX, and SVID things. | |
31 | _GNU_SOURCE All of the above, plus GNU extensions. | |
32 | ||
33 | The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__. | |
d3669add | 34 | If none of these are defined, the default is all but _GNU_SOURCE. |
28f540f4 RM |
35 | If more than one of these are defined, they accumulate. |
36 | For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE | |
37 | together give you ANSI C, 1003.1, and 1003.2, but nothing else. | |
38 | ||
39 | These are defined by this file and are used by the | |
40 | header files to decide what to declare or define: | |
41 | ||
42 | __USE_POSIX Define IEEE Std 1003.1 things. | |
43 | __USE_POSIX2 Define IEEE Std 1003.2 things. | |
44 | __USE_BSD Define 4.3BSD things. | |
45 | __USE_SVID Define SVID things. | |
46 | __USE_MISC Define things common to BSD and System V Unix. | |
47 | __USE_GNU Define GNU extensions. | |
aa910907 | 48 | __USE_REENTRANT Define reentrant/thread-safe *_r functions. |
28f540f4 RM |
49 | __FAVOR_BSD Favor 4.3BSD things in cases of conflict. |
50 | ||
51 | The macro `__GNU_LIBRARY__' is defined by this file unconditionally. | |
52 | ||
53 | All macros defined by this file are defined as 1. | |
54 | All macros listed above as possibly being defined by this file are | |
55 | explicitly undefined if they are not explicitly defined. | |
56 | Feature-test macros that are not defined by the user or compiler | |
57 | but are implied by the other feature-test macros defined (or by the | |
58 | lack of any definitions) are defined by the file. */ | |
59 | ||
60 | ||
61 | /* Undefine everything, so we get a clean slate. */ | |
62 | #undef __USE_POSIX | |
63 | #undef __USE_POSIX2 | |
64 | #undef __USE_BSD | |
65 | #undef __USE_SVID | |
66 | #undef __USE_MISC | |
67 | #undef __USE_GNU | |
aa910907 | 68 | #undef __USE_REENTRANT |
28f540f4 RM |
69 | #undef __FAVOR_BSD |
70 | ||
71 | ||
28f540f4 RM |
72 | /* Always use ANSI things. */ |
73 | #define __USE_ANSI 1 | |
74 | ||
75 | ||
76 | /* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */ | |
d3669add | 77 | #if defined (_BSD_SOURCE) && \ |
4d585333 RM |
78 | !(defined (_POSIX_SOURCE) || defined (_POSIX_C_SOURCE) || \ |
79 | defined (_GNU_SOURCE) || defined (_SVID_SOURCE)) | |
28f540f4 RM |
80 | #define __FAVOR_BSD 1 |
81 | #endif | |
82 | ||
83 | ||
84 | /* If nothing (other than _GNU_SOURCE) is defined, | |
85 | define _BSD_SOURCE and _SVID_SOURCE. */ | |
86 | #if (!defined(__STRICT_ANSI__) && !defined(_POSIX_SOURCE) && \ | |
87 | !defined(_POSIX_C_SOURCE) && !defined(_BSD_SOURCE) && \ | |
88 | !defined(_SVID_SOURCE)) | |
89 | #define _BSD_SOURCE 1 | |
90 | #define _SVID_SOURCE 1 | |
91 | #endif | |
92 | ||
93 | /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2. */ | |
94 | #if (!defined(__STRICT_ANSI__) && !defined(_POSIX_SOURCE) && \ | |
95 | !defined(_POSIX_C_SOURCE)) | |
96 | #define _POSIX_SOURCE 1 | |
97 | #define _POSIX_C_SOURCE 2 | |
98 | #endif | |
99 | ||
100 | #if defined(_POSIX_SOURCE) || _POSIX_C_SOURCE >= 1 | |
101 | #define __USE_POSIX 1 | |
102 | #endif | |
103 | ||
104 | #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 2 | |
105 | #define __USE_POSIX2 1 | |
106 | #endif | |
107 | ||
108 | #if defined(_BSD_SOURCE) || defined(_SVID_SOURCE) | |
109 | #define __USE_MISC 1 | |
110 | #endif | |
111 | ||
112 | #ifdef _BSD_SOURCE | |
113 | #define __USE_BSD 1 | |
114 | #endif | |
115 | ||
116 | #ifdef _SVID_SOURCE | |
117 | #define __USE_SVID 1 | |
118 | #endif | |
119 | ||
120 | #ifdef _GNU_SOURCE | |
121 | #define __USE_GNU 1 | |
122 | #endif | |
123 | ||
aa910907 RM |
124 | #if defined (__USE_GNU) || defined (__USE_MISC) |
125 | #define __USE_REENTRANT 1 | |
126 | #endif | |
127 | ||
28f540f4 | 128 | |
487253ea RM |
129 | /* This macro indicates that the installed library is the GNU C Library. |
130 | Its value must be incremented whenever any existing library interface | |
131 | changes such that callers must be recompiled with the new header files. | |
132 | This value should always coincide with the major version number used for | |
133 | the shared C library corresponding to this set of header files. */ | |
134 | ||
28f540f4 | 135 | #undef __GNU_LIBRARY__ |
487253ea | 136 | #define __GNU_LIBRARY__ 5 |
28f540f4 RM |
137 | |
138 | ||
139 | #if !defined(__GNUC__) || __GNUC__ < 2 | |
140 | /* In GCC version 2, (__extension__ EXPR) will not complain | |
141 | about GCC extensions used in EXPR under -ansi or -pedantic. */ | |
142 | #define __extension__ | |
143 | #endif | |
144 | ||
145 | ||
146 | /* This is here only because every header file already includes this one. */ | |
147 | #include <sys/cdefs.h> | |
148 | ||
149 | /* This is here only because every header file already includes this one. */ | |
150 | #ifndef _LIBC | |
151 | /* Get the definitions of all the appropriate `__stub_FUNCTION' symbols. | |
152 | <stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub | |
153 | which will always return failure (and set errno to ENOSYS). | |
154 | ||
155 | We avoid including <stubs.h> when compiling the C library itself to | |
156 | avoid a dependency loop. stubs.h depends on every object file. If | |
157 | this #include were done for the library source code, then every object | |
158 | file would depend on stubs.h. */ | |
159 | ||
160 | #include <stubs.h> | |
161 | #endif | |
162 | ||
163 | #endif /* __features.h */ |