X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=include%2Ffeatures.h;h=41e83a93ff425464ee56d380d18a170e4a5a5505;hb=eae3172be207b6212f327b43eee429c091bd0419;hp=44a4f55ac709378fe213b4189f9e9bb4af7143d0;hpb=469cdfc504836ec2e6ac4cfc8cc0a388dac149a4;p=uclinux-h8%2FuClibc.git diff --git a/include/features.h b/include/features.h index 44a4f55ac..41e83a93f 100644 --- a/include/features.h +++ b/include/features.h @@ -1,68 +1,451 @@ +/* Copyright (C) 1991-1993,1995-2006,2007,2009 Free Software Foundation, Inc. + This file is part of the GNU C Library. -#ifndef __FEATURES_H -#define __FEATURES_H + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. -/* Major and minor version number of the uClibc library package. Use - these macros to test for features in specific releases. */ -#define __UCLIBC__ 0 -#define __UCLIBC_MAJOR__ 9 -#define __UCLIBC_MINOR__ 1 + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _FEATURES_H +#define _FEATURES_H 1 + +/* These are defined by the user (or the compiler) + to specify the desired environment: + + __STRICT_ANSI__ ISO Standard C. + _ISOC99_SOURCE Extensions to ISO C89 from ISO C99. + _POSIX_SOURCE IEEE Std 1003.1. + _POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2; + if >=199309L, add IEEE Std 1003.1b-1993; + if >=199506L, add IEEE Std 1003.1c-1995; + if >=200112L, all of IEEE 1003.1-2004 + if >=200809L, all of IEEE 1003.1-2008 + _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if + Single Unix conformance is wanted, to 600 for the + sixth revision, to 700 for the seventh revision. + _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions. + _LARGEFILE_SOURCE Some more functions for correct standard I/O. + _LARGEFILE64_SOURCE Additional functionality from LFS for large files. + _FILE_OFFSET_BITS=N Select default filesystem interface. + _BSD_SOURCE ISO C, POSIX, and 4.3BSD things. + _SVID_SOURCE ISO C, POSIX, and SVID things. + _ATFILE_SOURCE Additional *at interfaces. + _GNU_SOURCE All of the above, plus GNU extensions. + _REENTRANT Select additionally reentrant object. + _THREAD_SAFE Same as _REENTRANT, often used by other systems. + _FORTIFY_SOURCE If set to numeric value > 0 additional security + measures are defined, according to level. + + The `-ansi' switch to the GNU C compiler defines __STRICT_ANSI__. + If none of these are defined, the default is to have _SVID_SOURCE, + _BSD_SOURCE, and _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to + 200112L. If more than one of these are defined, they accumulate. + For example __STRICT_ANSI__, _POSIX_SOURCE and _POSIX_C_SOURCE + together give you ISO C, 1003.1, and 1003.2, but nothing else. + + These are defined by this file and are used by the + header files to decide what to declare or define: + + __USE_ISOC99 Define ISO C99 things. + __USE_ISOC95 Define ISO C90 AMD1 (C95) things. + __USE_POSIX Define IEEE Std 1003.1 things. + __USE_POSIX2 Define IEEE Std 1003.2 things. + __USE_POSIX199309 Define IEEE Std 1003.1, and .1b things. + __USE_POSIX199506 Define IEEE Std 1003.1, .1b, .1c and .1i things. + __USE_XOPEN Define XPG things. + __USE_XOPEN_EXTENDED Define X/Open Unix things. + __USE_UNIX98 Define Single Unix V2 things. + __USE_XOPEN2K Define XPG6 things. + __USE_XOPEN2K8 Define XPG7 things. + __USE_LARGEFILE Define correct standard I/O things. + __USE_LARGEFILE64 Define LFS things with separate names. + __USE_FILE_OFFSET64 Define 64bit interface as default. + __USE_BSD Define 4.3BSD things. + __USE_SVID Define SVID things. + __USE_MISC Define things common to BSD and System V Unix. + __USE_ATFILE Define *at interfaces and AT_* constants for them. + __USE_GNU Define GNU extensions. + __USE_REENTRANT Define reentrant/thread-safe *_r functions. + __USE_FORTIFY_LEVEL Additional security measures used, according to level. + __FAVOR_BSD Favor 4.3BSD things in cases of conflict. + + The macros `__GNU_LIBRARY__', `__GLIBC__', and `__GLIBC_MINOR__' are + defined by this file unconditionally. `__GNU_LIBRARY__' is provided + only for compatibility. All new code should use the other symbols + to test for features. + + All macros listed above as possibly being defined by this file are + explicitly undefined if they are not explicitly defined. + Feature-test macros that are not defined by the user or compiler + but are implied by the other feature-test macros defined (or by the + lack of any definitions) are defined by the file. */ -/* Make a half-hearted attempt to accomodate non-gcc compilers */ -#ifndef __GNUC__ -#define __attribute(foo) /* Ignore */ + +/* Undefine everything, so we get a clean slate. */ +#undef __USE_ISOC99 +#undef __USE_ISOC95 +#undef __USE_POSIX +#undef __USE_POSIX2 +#undef __USE_POSIX199309 +#undef __USE_POSIX199506 +#undef __USE_XOPEN +#undef __USE_XOPEN_EXTENDED +#undef __USE_UNIX98 +#undef __USE_XOPEN2K +#undef __USE_XOPEN2K8 +#undef __USE_LARGEFILE +#undef __USE_LARGEFILE64 +#undef __USE_FILE_OFFSET64 +#undef __USE_BSD +#undef __USE_SVID +#undef __USE_MISC +#undef __USE_ATFILE +#undef __USE_GNU +#undef __USE_REENTRANT +#undef __USE_FORTIFY_LEVEL +#undef __FAVOR_BSD +#undef __KERNEL_STRICT_NAMES + +/* Suppress kernel-name space pollution unless user expressedly asks + for it. */ +#ifndef _LOOSE_KERNEL_NAMES +# define __KERNEL_STRICT_NAMES #endif -/* __restrict is known in EGCS 1.2 and above. */ -#if !defined __GNUC__ || __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 92) -# define __restrict /* Ignore */ +/* Always use ISO C things. */ +#define __USE_ANSI 1 + +/* Convenience macros to test the versions of glibc and gcc. + Use them like this: + #if __GNUC_PREREQ (2,8) + ... code requiring gcc 2.8 or later ... + #endif + Note - they won't work for gcc1 or glibc1, since the _MINOR macros + were not defined then. */ +#if defined __GNUC__ && defined __GNUC_MINOR__ +# define __GNUC_PREREQ(maj, min) \ + ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) +#else +# define __GNUC_PREREQ(maj, min) 0 #endif -#ifdef __STDC__ +/* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */ +#if defined _BSD_SOURCE && \ + !(defined _POSIX_SOURCE || defined _POSIX_C_SOURCE || \ + defined _XOPEN_SOURCE || defined _XOPEN_SOURCE_EXTENDED || \ + defined _GNU_SOURCE || defined _SVID_SOURCE) +# define __FAVOR_BSD 1 +#endif + +/* If _GNU_SOURCE was defined by the user, turn on all the other features. */ +#ifdef _GNU_SOURCE +# undef _ISOC99_SOURCE +# define _ISOC99_SOURCE 1 +# undef _POSIX_SOURCE +# define _POSIX_SOURCE 1 +# undef _POSIX_C_SOURCE +# define _POSIX_C_SOURCE 200809L +# undef _XOPEN_SOURCE +# define _XOPEN_SOURCE 700 +# undef _XOPEN_SOURCE_EXTENDED +# define _XOPEN_SOURCE_EXTENDED 1 +# undef _LARGEFILE64_SOURCE +# define _LARGEFILE64_SOURCE 1 +# undef _BSD_SOURCE +# define _BSD_SOURCE 1 +# undef _SVID_SOURCE +# define _SVID_SOURCE 1 +# undef _ATFILE_SOURCE +# define _ATFILE_SOURCE 1 +#endif + +/* This macro indicates that the installed library is uClibc. Use + * __UCLIBC_MAJOR__ and __UCLIBC_MINOR__ to test for the features in + * specific releases. */ +#define __UCLIBC__ 1 -#define __P(x) x -#define __PMT(x) x -#define __const const +#ifdef __UCLIBC__ +/* Load up the current set of uClibc supported features along + * with the current uClibc major and minor version numbers. + * For uClibc release 0.9.26, these numbers would be: + * #define __UCLIBC_MAJOR__ 0 + * #define __UCLIBC_MINOR__ 9 + * #define __UCLIBC_SUBLEVEL__ 26 + */ +# define __need_uClibc_config_h +# include +# undef __need_uClibc_config_h -/* Almost ansi */ -#if __STDC__ != 1 -#define const -#define volatile +/* For uClibc, always optimize for size -- this should disable + * a lot of expensive inlining... + * TODO: this is wrong! __OPTIMIZE_SIZE__ is an indicator of + * gcc -Os compile. We should not mess with compiler inlines. + * We should instead disable __USE_EXTERN_INLINES unconditionally, + * or maybe actually audit and test uclibc to work correctly + * with __USE_EXTERN_INLINES on. + */ +# define __OPTIMIZE_SIZE__ 1 + +/* disable unsupported features */ +# undef __LDBL_COMPAT + +# ifndef __UCLIBC_HAS_FORTIFY__ +# undef _FORTIFY_SOURCE +# endif + +# ifndef __UCLIBC_HAS_THREADS__ +# if defined _REENTRANT || defined _THREAD_SAFE +# warning requested reentrant code, but thread support was disabled +# undef _REENTRANT +# undef _THREAD_SAFE +# endif +# endif + +# ifndef __UCLIBC_HAS_LFS__ +# undef _LARGEFILE64_SOURCE +/* NOTE: This is probably incorrect on a 64-bit arch... */ +# if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 +# error It appears you have defined _FILE_OFFSET_BITS=64. Unfortunately, \ +uClibc was built without large file support enabled. +# endif +# elif defined __BCC__ +# error BCC does not support LFS, please disable it +# endif +#endif /* __UCLIBC__ */ + +/* If nothing (other than _GNU_SOURCE) is defined, + define _BSD_SOURCE and _SVID_SOURCE. */ +#if (!defined __STRICT_ANSI__ && !defined _ISOC99_SOURCE && \ + !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE && \ + !defined _XOPEN_SOURCE && !defined _XOPEN_SOURCE_EXTENDED && \ + !defined _BSD_SOURCE && !defined _SVID_SOURCE) +# define _BSD_SOURCE 1 +# define _SVID_SOURCE 1 #endif -#else /* K&R */ +/* This is to enable the ISO C99 extension. Also recognize the old macro + which was used prior to the standard acceptance. This macro will + eventually go away and the features enabled by default once the ISO C99 + standard is widely adopted. */ +#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \ + || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) +# define __USE_ISOC99 1 +#endif -#define __P(x) () -#define __const -#define const -#define volatile +/* This is to enable the ISO C90 Amendment 1:1995 extension. */ +#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \ + || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L)) +# define __USE_ISOC95 1 +#endif +/* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2 + (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined). */ +#if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \ + !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE) +# define _POSIX_SOURCE 1 +# if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500 +# define _POSIX_C_SOURCE 2 +# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 600 +# define _POSIX_C_SOURCE 199506L +# elif defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 700 +# define _POSIX_C_SOURCE 200112L +# else +# define _POSIX_C_SOURCE 200809L +# endif +# define __USE_POSIX_IMPLICITLY 1 #endif -/* No C++ */ -#define __BEGIN_DECLS -#define __END_DECLS +#if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE +# define __USE_POSIX 1 +#endif -/* GNUish things */ -#define __CONSTVALUE -#define __CONSTVALUE2 +#if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE +# define __USE_POSIX2 1 +#endif -#define __USE_BSD -#define __USE_MISC -#define __USE_POSIX -#define __USE_POSIX2 -#define __USE_XOPEN +#if (_POSIX_C_SOURCE - 0) >= 199309L +# define __USE_POSIX199309 1 +#endif -#undef __KERNEL_STRICT_NAMES -#ifndef _LOOSE_KERNEL_NAMES -# define __KERNEL_STRICT_NAMES +#if (_POSIX_C_SOURCE - 0) >= 199506L +# define __USE_POSIX199506 1 +#endif + +#if (_POSIX_C_SOURCE - 0) >= 200112L +# define __USE_XOPEN2K 1 +# undef __USE_ISOC99 +# define __USE_ISOC99 1 +#endif + +#if (_POSIX_C_SOURCE - 0) >= 200809L +# define __USE_XOPEN2K8 1 +# undef _ATFILE_SOURCE +# define _ATFILE_SOURCE 1 +#endif + +#ifdef _XOPEN_SOURCE +# define __USE_XOPEN 1 +# if (_XOPEN_SOURCE - 0) >= 500 +# define __USE_XOPEN_EXTENDED 1 +# define __USE_UNIX98 1 +# undef _LARGEFILE_SOURCE +# define _LARGEFILE_SOURCE 1 +# if (_XOPEN_SOURCE - 0) >= 600 +# if (_XOPEN_SOURCE - 0) >= 700 +# define __USE_XOPEN2K8 1 +# endif +# define __USE_XOPEN2K 1 +# undef __USE_ISOC99 +# define __USE_ISOC99 1 +# endif +# else +# ifdef _XOPEN_SOURCE_EXTENDED +# define __USE_XOPEN_EXTENDED 1 +# endif +# endif +#endif + +#ifdef _LARGEFILE_SOURCE +# define __USE_LARGEFILE 1 +#endif + +#ifdef _LARGEFILE64_SOURCE +# define __USE_LARGEFILE64 1 +#endif + +#if defined _FILE_OFFSET_BITS && _FILE_OFFSET_BITS == 64 +# define __USE_FILE_OFFSET64 1 +#endif + +#if defined _BSD_SOURCE || defined _SVID_SOURCE +# define __USE_MISC 1 #endif +#ifdef _BSD_SOURCE +# define __USE_BSD 1 +#endif -#include +#ifdef _SVID_SOURCE +# define __USE_SVID 1 +#endif +#ifdef _ATFILE_SOURCE +# define __USE_ATFILE 1 +#endif + +#ifdef _GNU_SOURCE +# define __USE_GNU 1 +#endif + +#if defined _REENTRANT || defined _THREAD_SAFE +# define __USE_REENTRANT 1 +#endif + +#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \ + && __GNUC_PREREQ (4, 1) && defined __OPTIMIZE__ && __OPTIMIZE__ > 0 +# if _FORTIFY_SOURCE > 1 +# define __USE_FORTIFY_LEVEL 2 +# else +# define __USE_FORTIFY_LEVEL 1 +# endif +#else +# define __USE_FORTIFY_LEVEL 0 +#endif + +/* We do support the IEC 559 math functionality, real and complex. */ +#ifdef __UCLIBC_HAS_FLOATS__ +#define __STDC_IEC_559__ 1 +#define __STDC_IEC_559_COMPLEX__ 1 +#endif + +#ifdef __UCLIBC_HAS_WCHAR__ +/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.1. */ +#define __STDC_ISO_10646__ 200009L +#endif + +/* There is an unwholesomely huge amount of code out there that depends on the + * presence of GNU libc header files. We have GNU libc header files. So here + * we commit a horrible sin. At this point, we _lie_ and claim to be GNU libc + * to make things like /usr/include/linux/socket.h and lots of apps work as + * their developers intended. This is IMHO, pardonable, since these defines + * are not really intended to check for the presence of a particular library, + * but rather are used to define an _interface_. */ +#if !defined __FORCE_NOGLIBC && (!defined _LIBC || defined __FORCE_GLIBC) +/* This macro indicates that the installed library is the GNU C Library. + For historic reasons the value now is 6 and this will stay from now + on. The use of this variable is deprecated. */ +/* uClibc WARNING: leave these aligned to the left, don't put a space after '#', else + * broken apps could fail the check. */ +#undef __GNU_LIBRARY__ +#define __GNU_LIBRARY__ 6 + +/* Major and minor version number of the GNU C library package. Use + these macros to test for features in specific releases. */ +/* Don't do it, if you want to keep uClibc happy. */ +#define __GLIBC__ 2 +#define __GLIBC_MINOR__ 2 +#endif + +#define __GLIBC_PREREQ(maj, min) \ + ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) + +#ifndef __UCLIBC__ +/* Decide whether a compiler supports the long long datatypes. */ +#if defined __GNUC__ \ + || (defined __PGI && defined __i386__ ) \ + || (defined __INTEL_COMPILER && (defined __i386__ || defined __ia64__)) \ + || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L) +# define __GLIBC_HAVE_LONG_LONG 1 +#endif +#endif + +/* This is here only because every header file already includes this one. */ +#ifndef __ASSEMBLER__ +# ifndef _SYS_CDEFS_H +# include +# endif + +/* If we don't have __REDIRECT, prototypes will be missing if + __USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */ +# if defined __USE_FILE_OFFSET64 && !defined __REDIRECT +# define __USE_LARGEFILE 1 +# ifdef __UCLIBC_HAS_LFS__ +# define __USE_LARGEFILE64 1 +# endif +# endif + +#endif /* !ASSEMBLER */ + +/* Decide whether we can, and are willing to define extern inline + * functions in headers, even if this results in a slightly bigger + * code for user programs built against uclibc. + * Enabled only in -O2 compiles, not -Os. + * uclibc itself is usually built without __USE_EXTERN_INLINES, + * remove "&& !defined __OPTIMIZE_SIZE__" part to do otherwise. + */ +#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ + && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \ + && (defined __extern_inline || defined __GNUC_GNU_INLINE__ || defined __GNUC_STDC_INLINE__) +# define __USE_EXTERN_INLINES 1 +#endif +#ifdef _LIBC +# ifdef __UCLIBC_HAS_LFS__ +# undef _FILE_OFFSET_BITS +# undef __USE_FILE_OFFSET64 +# endif +# include #endif +#endif /* features.h */