158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
/* Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#ifndef _FEATURES_H
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#define _FEATURES_H 1
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/* These are defined by the user (or the compiler)
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to specify the desired environment:
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__STRICT_ANSI__ ANSI Standard C.
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_POSIX_SOURCE IEEE Std 1003.1.
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_POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if ==2 add IEEE Std 1003.2.
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_BSD_SOURCE ANSI, POSIX, and 4.3BSD things.
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_SVID_SOURCE ANSI, POSIX, and SVID things.
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_GNU_SOURCE All of the above, plus GNU extensions.
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The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__.
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If none of these are defined, the default is _GNU_SOURCE.
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If more than one of these are defined, they accumulate.
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For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE
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together give you ANSI C, 1003.1, and 1003.2, but nothing else.
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These are defined by this file and are used by the
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header files to decide what to declare or define:
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__USE_POSIX Define IEEE Std 1003.1 things.
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__USE_POSIX2 Define IEEE Std 1003.2 things.
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__USE_BSD Define 4.3BSD things.
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__USE_SVID Define SVID things.
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__USE_MISC Define things common to BSD and System V Unix.
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__USE_GNU Define GNU extensions.
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__FAVOR_BSD Favor 4.3BSD things in cases of conflict.
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The macro `__GNU_LIBRARY__' is defined by this file unconditionally.
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All macros defined by this file are defined as 1.
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All macros listed above as possibly being defined by this file are
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explicitly undefined if they are not explicitly defined.
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Feature-test macros that are not defined by the user or compiler
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but are implied by the other feature-test macros defined (or by the
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lack of any definitions) are defined by the file. */
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/* Undefine everything, so we get a clean slate. */
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#undef __USE_POSIX
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#undef __USE_POSIX2
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#undef __USE_BSD
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#undef __USE_SVID
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#undef __USE_MISC
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#undef __USE_GNU
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#undef __FAVOR_BSD
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/* If nothing is defined, define _GNU_SOURCE. */
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#if (!defined(_GNU_SOURCE) && !defined(__STRICT_ANSI__) && \
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!defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) && \
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!defined(_BSD_SOURCE) && !defined(_SVID_SOURCE))
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#define _GNU_SOURCE 1
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#endif
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/* Always use ANSI things. */
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#define __USE_ANSI 1
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/* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
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#ifdef _BSD_SOURCE
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#define __FAVOR_BSD 1
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#endif
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/* If nothing (other than _GNU_SOURCE) is defined,
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define _BSD_SOURCE and _SVID_SOURCE. */
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#if (!defined(__STRICT_ANSI__) && !defined(_POSIX_SOURCE) && \
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!defined(_POSIX_C_SOURCE) && !defined(_BSD_SOURCE) && \
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!defined(_SVID_SOURCE))
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#define _BSD_SOURCE 1
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#define _SVID_SOURCE 1
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#endif
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/* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2. */
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#if (!defined(__STRICT_ANSI__) && !defined(_POSIX_SOURCE) && \
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!defined(_POSIX_C_SOURCE))
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#define _POSIX_SOURCE 1
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#define _POSIX_C_SOURCE 2
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#endif
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#if defined(_POSIX_SOURCE) || _POSIX_C_SOURCE >= 1
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#define __USE_POSIX 1
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#endif
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#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 2
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#define __USE_POSIX2 1
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#endif
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#if defined(_BSD_SOURCE) || defined(_SVID_SOURCE)
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#define __USE_MISC 1
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#endif
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#ifdef _BSD_SOURCE
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#define __USE_BSD 1
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#endif
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#ifdef _SVID_SOURCE
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#define __USE_SVID 1
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#endif
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#ifdef _GNU_SOURCE
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#define __USE_GNU 1
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#endif
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#undef __GNU_LIBRARY__
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#define __GNU_LIBRARY__ 1
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#if !defined(__GNUC__) || __GNUC__ < 2
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/* In GCC version 2, (__extension__ EXPR) will not complain
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about GCC extensions used in EXPR under -ansi or -pedantic. */
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#define __extension__
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#endif
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/* This is here only because every header file already includes this one. */
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#include <sys/cdefs.h>
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/* This is here only because every header file already includes this one. */
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#ifndef _LIBC
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/* Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
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<stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub
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which will always return failure (and set errno to ENOSYS).
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We avoid including <stubs.h> when compiling the C library itself to
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avoid a dependency loop. stubs.h depends on every object file. If
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this #include were done for the library source code, then every object
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file would depend on stubs.h. */
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#include <stubs.h>
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#endif
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#endif /* __features.h */
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