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phoenix |
/* Copyright (C) 1991,92,93,95,96,97,98,99,2000,2001 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _FEATURES_H
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#define _FEATURES_H 1
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/* For uClibc, always optimize for size -- this should disable
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* a lot of expensive inlining... */
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#define __OPTIMIZE_SIZE__ 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__ ISO Standard C.
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_ISOC99_SOURCE Extensions to ISO C89 from ISO C99.
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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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if >=199309L, add IEEE Std 1003.1b-1993;
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if >=199506L, add IEEE Std 1003.1c-1995
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_XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
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Single Unix conformance is wanted, to 600 for the
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upcoming sixth revision.
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_XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
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_LARGEFILE_SOURCE Some more functions for correct standard I/O.
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_LARGEFILE64_SOURCE Additional functionality from LFS for large files.
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_FILE_OFFSET_BITS=N Select default filesystem interface.
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_BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
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_SVID_SOURCE ISO C, POSIX, and SVID things.
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_GNU_SOURCE All of the above, plus GNU extensions.
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_REENTRANT Select additionally reentrant object.
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_THREAD_SAFE Same as _REENTRANT, often used by other systems.
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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 to have _SVID_SOURCE,
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_BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to
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199506L. 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 ISO 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_ISOC99 Define ISO C99 things.
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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_POSIX199309 Define IEEE Std 1003.1, and .1b things.
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__USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things.
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__USE_XOPEN Define XPG things.
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__USE_XOPEN_EXTENDED Define X/Open Unix things.
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__USE_UNIX98 Define Single Unix V2 things.
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__USE_XOPEN2K Define XPG6 things.
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__USE_LARGEFILE Define correct standard I/O things.
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__USE_LARGEFILE64 Define LFS things with separate names.
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__USE_FILE_OFFSET64 Define 64bit interface as default.
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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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__USE_REENTRANT Define reentrant/thread-safe *_r functions.
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__FAVOR_BSD Favor 4.3BSD things in cases of conflict.
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The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are
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defined by this file unconditionally. `__GNU_LIBRARY__' is provided
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only for compatibility. All new code should use the other symbols
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to test for features.
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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_ISOC99
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#undef __USE_POSIX
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#undef __USE_POSIX2
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#undef __USE_POSIX199309
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#undef __USE_POSIX199506
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#undef __USE_XOPEN
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#undef __USE_XOPEN_EXTENDED
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#undef __USE_UNIX98
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#undef __USE_XOPEN2K
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#undef __USE_LARGEFILE
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#undef __USE_LARGEFILE64
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#undef __USE_FILE_OFFSET64
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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 __USE_REENTRANT
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#undef __FAVOR_BSD
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#undef __KERNEL_STRICT_NAMES
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/* Suppress kernel-name space pollution unless user expressedly asks
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for it. */
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#ifndef _LOOSE_KERNEL_NAMES
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# define __KERNEL_STRICT_NAMES
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#endif
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/* Always use ISO C 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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#if defined _BSD_SOURCE && \
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!(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \
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defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \
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defined _GNU_SOURCE || defined _SVID_SOURCE)
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# define __FAVOR_BSD 1
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#endif
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/* If _GNU_SOURCE was defined by the user, turn on all the other features. */
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#ifdef _GNU_SOURCE
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# undef _ISOC99_SOURCE
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# define _ISOC99_SOURCE 1
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# undef _POSIX_SOURCE
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# define _POSIX_SOURCE 1
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# undef _POSIX_C_SOURCE
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# define _POSIX_C_SOURCE 199506L
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# undef _XOPEN_SOURCE
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# define _XOPEN_SOURCE 600
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# undef _XOPEN_SOURCE_EXTENDED
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# define _XOPEN_SOURCE_EXTENDED 1
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# undef _LARGEFILE64_SOURCE
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# define _LARGEFILE64_SOURCE 1
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# undef _BSD_SOURCE
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# define _BSD_SOURCE 1
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# undef _SVID_SOURCE
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# define _SVID_SOURCE 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 _ISOC99_SOURCE && \
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!defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \
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!defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \
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!defined _BSD_SOURCE && !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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/* This is to enable the ISO C99 extension. Also recognize the old macro
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which was used prior to the standard acceptance. This macro will
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eventually go away and the features enabled by default once the ISO C99
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standard is widely adopted. */
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#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
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|| (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
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# define __USE_ISOC99 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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(and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */
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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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# if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500
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# define _POSIX_C_SOURCE 2
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# else
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# define _POSIX_C_SOURCE 199506L
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# endif
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#endif
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#if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE
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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 || defined _XOPEN_SOURCE
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# define __USE_POSIX2 1
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#endif
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#if (_POSIX_C_SOURCE - 0) >= 199309L
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# define __USE_POSIX199309 1
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#endif
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#if (_POSIX_C_SOURCE - 0) >= 199506L
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# define __USE_POSIX199506 1
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#endif
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#ifdef _XOPEN_SOURCE
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# define __USE_XOPEN 1
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# if (_XOPEN_SOURCE - 0) >= 500
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# define __USE_XOPEN_EXTENDED 1
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# define __USE_UNIX98 1
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# undef _LARGEFILE_SOURCE
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# define _LARGEFILE_SOURCE 1
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# if (_XOPEN_SOURCE - 0) >= 600
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# define __USE_XOPEN2K 1
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# undef __USE_ISOC99
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# define __USE_ISOC99 1
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# endif
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# else
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# ifdef _XOPEN_SOURCE_EXTENDED
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# define __USE_XOPEN_EXTENDED 1
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# endif
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# endif
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#endif
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#ifdef _LARGEFILE_SOURCE
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# define __USE_LARGEFILE 1
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#endif
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#ifdef _LARGEFILE64_SOURCE
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# define __USE_LARGEFILE64 1
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#endif
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#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64
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# define __USE_FILE_OFFSET64 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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#if defined _REENTRANT || defined _THREAD_SAFE
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# define __USE_REENTRANT 1
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#endif
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/* We do support the IEC 559 math functionality, real and complex. */
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#define __STDC_IEC_559__ 1
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#define __STDC_IEC_559_COMPLEX__ 1
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#ifdef __UCLIBC_HAS_WCHAR__
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/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.0. */
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#define __STDC_ISO_10646__ 200009L
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#endif
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/* This macro indicates that the installed library is uClibc. Use
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* __UCLIBC_MAJOR__ and __UCLIBC_MINOR__ to test for the features in
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* specific releases. */
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#define __UCLIBC__ 1
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/* Major and minor version number of the uClibc library package are
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* can be used to test for features in specific uClibc releases.
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*
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* Now included from bits/uClibc_config.h */
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#if 0
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/* For uClibc release 0.9.12, these numbers would be: */
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#define __UCLIBC_MAJOR__ 0
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#define __UCLIBC_MINOR__ 9
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#define __UCLIBC_SUBLEVEL__ 12
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#endif
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/* There is an unwholesomely huge amount of code out there that depends on the
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* presence of GNU libc header files. We have GNU libc header files. So here
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* we commit a horrible sin. At this point, we _lie_ and claim to be GNU libc
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* to make things like /usr/include/linux/socket.h and lots of apps work as
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* their developers intended. This is IMHO, pardonable, since these defines
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* are not really intended to check for the presence of a particular library,
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* but rather are used to define an _interface_. */
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#if !defined __FORCE_NOGLIBC && (!defined _LIBC || defined __FORCE_GLIBC)
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# define __GNU_LIBRARY__ 6
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# define __GLIBC__ 2
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# define __GLIBC_MINOR__ 2
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#endif
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/* Convenience macros to test the versions of glibc and gcc.
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Use them like this:
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#if __GNUC_PREREQ (2,8)
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... code requiring gcc 2.8 or later ...
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#endif
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Note - they won't work for gcc1 or glibc1, since the _MINOR macros
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were not defined then. */
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#if defined __GNUC__ && defined __GNUC_MINOR__
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# define __GNUC_PREREQ(maj, min) \
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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
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#else
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# define __GNUC_PREREQ(maj, min) 0
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#endif
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#define __GLIBC_PREREQ(maj, min) \
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((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
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/* This is here only because every header file already includes this one. */
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#ifndef __ASSEMBLER__
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#ifndef _SYS_CDEFS_H
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# include <sys/cdefs.h>
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#endif
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/* If we don't have __REDIRECT, prototypes will be missing if
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__USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */
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# if defined __USE_FILE_OFFSET64 && !defined __REDIRECT
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# define __USE_LARGEFILE 1
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# define __USE_LARGEFILE64 1
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# endif
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#endif /* !ASSEMBLER */
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/* Decide whether we can define 'extern inline' functions in headers. */
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#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \
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&& !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__
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# define __USE_EXTERN_INLINES 1
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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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#if 0
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/*#ifndef _LIBC*/
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/* Get the definitions of all the appropriate `__stub_FUNCTION' symbols.
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<gnu/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 <gnu/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
|
331 |
|
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file would depend on stubs.h. */
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332 |
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|
333 |
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# include <gnu/stubs.h>
|
334 |
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#endif
|
335 |
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|
336 |
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/* Load up the current set of uClibc supported features */
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337 |
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#define __need_uClibc_config_h
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338 |
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#include <bits/uClibc_config.h>
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339 |
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#undef __need_uClibc_config_h
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340 |
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|
341 |
|
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/* Make sure users large file options agree with uClibc's configuration. */
|
342 |
|
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#ifndef __UCLIBC_HAS_LFS__
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343 |
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|
344 |
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/* If uClibc was built without large file support, output an error if
|
345 |
|
|
* and 64-bit file offsets were requested, output an error.
|
346 |
|
|
* NOTE: This is probably incorrect on a 64-bit arch... */
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347 |
|
|
#ifdef __USE_FILE_OFFSET64
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348 |
|
|
#error It appears you have defined _FILE_OFFSET_BITS=64. Unfortunately, \
|
349 |
|
|
uClibc was built without large file support enabled.
|
350 |
|
|
#endif
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351 |
|
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|
352 |
|
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/* If uClibc was built without large file support and _LARGEFILE64_SOURCE
|
353 |
|
|
* is defined, undefine it. */
|
354 |
|
|
#if defined(_LARGEFILE64_SOURCE)
|
355 |
|
|
#undef _LARGEFILE64_SOURCE
|
356 |
|
|
#undef __USE_LARGEFILE64
|
357 |
|
|
#endif
|
358 |
|
|
|
359 |
|
|
/* If we're actually building uClibc with large file support,
|
360 |
|
|
* define __USE_LARGEFILE64 and __USE_LARGEFILE. */
|
361 |
|
|
#elif defined(_LIBC)
|
362 |
|
|
#undef _LARGEFILE_SOURCE
|
363 |
|
|
#undef _LARGEFILE64_SOURCE
|
364 |
|
|
#undef _FILE_OFFSET_BITS
|
365 |
|
|
#undef __USE_LARGEFILE
|
366 |
|
|
#undef __USE_LARGEFILE64
|
367 |
|
|
#undef __USE_FILE_OFFSET64
|
368 |
|
|
#define _LARGEFILE_SOURCE 1
|
369 |
|
|
#define _LARGEFILE64_SOURCE 1
|
370 |
|
|
#define __USE_LARGEFILE 1
|
371 |
|
|
#define __USE_LARGEFILE64 1
|
372 |
|
|
#endif
|
373 |
|
|
|
374 |
|
|
/* Some nice features only work properly with ELF */
|
375 |
|
|
#if defined _LIBC
|
376 |
|
|
#if defined __HAVE_ELF__
|
377 |
|
|
/* Define ALIASNAME as a weak alias for NAME. */
|
378 |
|
|
# define weak_alias(name, aliasname) _weak_alias (name, aliasname)
|
379 |
|
|
# define _weak_alias(name, aliasname) \
|
380 |
|
|
extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
|
381 |
|
|
/* Define ALIASNAME as a strong alias for NAME. */
|
382 |
|
|
# define strong_alias(name, aliasname) _strong_alias(name, aliasname)
|
383 |
|
|
# define _strong_alias(name, aliasname) \
|
384 |
|
|
extern __typeof (name) aliasname __attribute__ ((alias (#name)));
|
385 |
|
|
/* This comes between the return type and function name in
|
386 |
|
|
* a function definition to make that definition weak. */
|
387 |
|
|
# define weak_function __attribute__ ((weak))
|
388 |
|
|
# define weak_const_function __attribute__ ((weak, __const__))
|
389 |
|
|
/* Tacking on "\n\t#" to the section name makes gcc put it's bogus
|
390 |
|
|
* section attributes on what looks like a comment to the assembler. */
|
391 |
|
|
# if defined(__cris__)
|
392 |
|
|
# define link_warning(symbol, msg)
|
393 |
|
|
# else
|
394 |
|
|
# define link_warning(symbol, msg) \
|
395 |
|
|
asm (".section " ".gnu.warning." #symbol "\n\t.previous"); \
|
396 |
|
|
static const char __evoke_link_warning_##symbol[] \
|
397 |
|
|
__attribute__ ((unused, section (".gnu.warning." #symbol "\n\t#"))) = msg;
|
398 |
|
|
#endif
|
399 |
|
|
#else /* !defined __HAVE_ELF__ */
|
400 |
|
|
# define strong_alias(name, aliasname) _strong_alias (name, aliasname)
|
401 |
|
|
# define weak_alias(name, aliasname) _strong_alias (name, aliasname)
|
402 |
|
|
# define _strong_alias(name, aliasname) \
|
403 |
|
|
__asm__(".global " __C_SYMBOL_PREFIX__ #aliasname "\n" \
|
404 |
|
|
".set " __C_SYMBOL_PREFIX__ #aliasname "," __C_SYMBOL_PREFIX__ #name);
|
405 |
|
|
# define link_warning(symbol, msg) \
|
406 |
|
|
asm (".stabs \"" msg "\",30,0,0,0\n\t" \
|
407 |
|
|
".stabs \"" #symbol "\",1,0,0,0\n");
|
408 |
|
|
#endif
|
409 |
|
|
|
410 |
|
|
#ifndef weak_function
|
411 |
|
|
/* If we do not have the __attribute__ ((weak)) syntax, there is no way we
|
412 |
|
|
can define functions as weak symbols. The compiler will emit a `.globl'
|
413 |
|
|
directive for the function symbol, and a `.weak' directive in addition
|
414 |
|
|
will produce an error from the assembler. */
|
415 |
|
|
# define weak_function /* empty */
|
416 |
|
|
# define weak_const_function /* empty */
|
417 |
|
|
#endif
|
418 |
|
|
|
419 |
|
|
/* On some platforms we can make internal function calls (i.e., calls of
|
420 |
|
|
functions not exported) a bit faster by using a different calling
|
421 |
|
|
convention. */
|
422 |
|
|
#ifndef internal_function
|
423 |
|
|
# define internal_function /* empty */
|
424 |
|
|
#endif
|
425 |
|
|
|
426 |
|
|
/* Prepare for the case that `__builtin_expect' is not available. */
|
427 |
|
|
#if __GNUC__ == 2 && __GNUC_MINOR__ < 96
|
428 |
|
|
#define __builtin_expect(x, expected_value) (x)
|
429 |
|
|
#endif
|
430 |
|
|
#ifndef likely
|
431 |
|
|
# define likely(x) __builtin_expect((!!(x)),1)
|
432 |
|
|
#endif
|
433 |
|
|
#ifndef unlikely
|
434 |
|
|
# define unlikely(x) __builtin_expect((!!(x)),0)
|
435 |
|
|
#endif
|
436 |
|
|
#ifndef __LINUX_COMPILER_H
|
437 |
|
|
#define __LINUX_COMPILER_H
|
438 |
|
|
#endif
|
439 |
|
|
|
440 |
|
|
/* --- this is added to integrate linuxthreads */
|
441 |
|
|
#define __USE_UNIX98 1
|
442 |
|
|
|
443 |
|
|
#endif /* _LIBC only stuff */
|
444 |
|
|
|
445 |
|
|
#ifndef __linux__
|
446 |
|
|
# define __linux__ 1
|
447 |
|
|
#endif
|
448 |
|
|
|
449 |
|
|
/* Disable __user, which shows up in 2.6.x include asm headers
|
450 |
|
|
* that get pulled in by signal.h */
|
451 |
|
|
#define __user
|
452 |
|
|
|
453 |
|
|
#endif /* features.h */
|