diff options
Diffstat (limited to 'include/features.h')
| -rw-r--r-- | include/features.h | 356 |
1 files changed, 286 insertions, 70 deletions
diff --git a/include/features.h b/include/features.h index f86788fa4..05afff6d8 100644 --- a/include/features.h +++ b/include/features.h @@ -1,6 +1,250 @@ -#ifndef __FEATURES_H -#define __FEATURES_H +/* Copyright (C) 1991,92,93,95,96,97,98,99,2000,2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + 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. + + 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 + _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if + Single Unix conformance is wanted, to 600 for the + upcoming sixth 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. + _GNU_SOURCE All of the above, plus GNU extensions. + _REENTRANT Select additionally reentrant object. + _THREAD_SAFE Same as _REENTRANT, often used by other systems. + + 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 + 199506L. 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_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_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_GNU Define GNU extensions. + __USE_REENTRANT Define reentrant/thread-safe *_r functions. + __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. */ + + +/* Undefine everything, so we get a clean slate. */ +#undef __USE_ISOC99 +#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_LARGEFILE +#undef __USE_LARGEFILE64 +#undef __USE_FILE_OFFSET64 +#undef __USE_BSD +#undef __USE_SVID +#undef __USE_MISC +#undef __USE_GNU +#undef __USE_REENTRANT +#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 + +/* Always use ISO C things. */ +#define __USE_ANSI 1 + + +/* 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 199506L +# undef _XOPEN_SOURCE +# define _XOPEN_SOURCE 600 +# 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 +#endif + +/* 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 + +/* 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 + +/* 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__ && !defined _POSIX_SOURCE && \ + !defined _POSIX_C_SOURCE) +# define _POSIX_SOURCE 1 +# if defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) < 500 +# define _POSIX_C_SOURCE 2 +# else +# define _POSIX_C_SOURCE 199506L +# endif +#endif + +#if defined _POSIX_SOURCE || _POSIX_C_SOURCE >= 1 || defined _XOPEN_SOURCE +# define __USE_POSIX 1 +#endif + +#if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE +# define __USE_POSIX2 1 +#endif + +#if (_POSIX_C_SOURCE - 0) >= 199309L +# define __USE_POSIX199309 1 +#endif + +#if (_POSIX_C_SOURCE - 0) >= 199506L +# define __USE_POSIX199506 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 +# 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 + +#ifdef _SVID_SOURCE +# define __USE_SVID 1 +#endif + +#ifdef _GNU_SOURCE +# define __USE_GNU 1 +#endif + +#if defined _REENTRANT || defined _THREAD_SAFE +# define __USE_REENTRANT 1 +#endif + +/* We do support the IEC 559 math functionality, real and complex. */ +#define __STDC_IEC_559__ 1 +#define __STDC_IEC_559_COMPLEX__ 1 + +/* wchar_t uses ISO 10646-1 (2nd ed., published 2000-09-15) / Unicode 3.0. */ +#define __STDC_ISO_10646__ 200009L /* Major and minor version number of the uClibc library package. Use these macros to test for features in specific releases. */ @@ -18,93 +262,67 @@ #if !defined _LIBC || defined __FORCE_GLIBC__ # define __GNU_LIBRARY__ 6 # define __GLIBC__ 2 -# define __GLIBC_MINOR__ 1 +# define __GLIBC_MINOR__ 2 #endif -/* Make a half-hearted attempt to accomodate non-gcc compilers */ -#ifndef __GNUC__ -#define __attribute(foo) /* Ignore */ -#endif - -/* Convenience macro to test the version of gcc. - * Use it like this: - * #if __GNUC_PREREQ (2,8) - * ... code requiring gcc 2.8 or later ... - * #endif - * Note - they won't work for gcc1, since the _MINOR macros - * were not defined then. */ +/* 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) \ +# define __GNUC_PREREQ(maj, min) \ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) #else -#define __GNUC_PREREQ(maj,min) 0 +# define __GNUC_PREREQ(maj, min) 0 #endif -/* __restrict is known in EGCS 1.2 and above. */ -#if !defined __GNUC__ || __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 92) -# define __restrict /* Ignore */ -#endif +#define __GLIBC_PREREQ(maj, min) \ + ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) -/* __extension__ is known in gcc 2.8 above. */ -#if !defined __GNUC__ || __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) -# define __extension__ /* Ignore */ +/* This is here only because every header file already includes this one. */ +#ifndef __ASSEMBLER__ +#ifndef _SYS_CDEFS_H +# include <sys/cdefs.h> #endif -#ifdef __STDC__ +/* 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 +# define __USE_LARGEFILE64 1 +# endif -#define __P(x) x -#define __PMT(x) x -#ifndef __const -#define __const const -#endif +#endif /* !ASSEMBLER */ -/* Almost ansi */ -#if __STDC__ != 1 -#ifndef const -#define const -#endif -#define volatile +/* Decide whether we can define 'extern inline' functions in headers. */ +#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ + && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ +# define __USE_EXTERN_INLINES 1 #endif -#else /* K&R */ +/* This is here only because every header file already includes this one. */ +#if 0 +//#ifndef _LIBC +/* Get the definitions of all the appropriate `__stub_FUNCTION' symbols. + <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub + which will always return failure (and set errno to ENOSYS). -#define __P(x) () -#ifndef __const -#define __const -#endif -#ifndef const -#define const -#endif -#define volatile + We avoid including <gnu/stubs.h> when compiling the C library itself to + avoid a dependency loop. stubs.h depends on every object file. If + this #include were done for the library source code, then every object + file would depend on stubs.h. */ +# include <gnu/stubs.h> #endif -/* GNUish things */ -#define __CONSTVALUE -#define __CONSTVALUE2 - -#define __USE_BSD -#define __USE_MISC -#define __USE_POSIX -#define __USE_POSIX2 -#define __USE_XOPEN - -#undef __KERNEL_STRICT_NAMES -#ifndef _LOOSE_KERNEL_NAMES -# define __KERNEL_STRICT_NAMES -#endif - -#ifdef _GNU_SOURCE -# define __USE_GNU 1 -#endif - -#include <sys/cdefs.h> - +/* Load up the current set of uClibc supported features */ #define __need_uClibc_config_h #include <bits/uClibc_config.h> #undef __need_uClibc_config_h - /* Some nice features only work properly with ELF */ #if defined HAVE_ELF # define link_warning(symbol, msg) \ @@ -121,6 +339,4 @@ __asm__(".global alias\n.set alias,original"); #endif - -#endif - +#endif /* features.h */ |