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Diffstat (limited to 'include/features.h')
| -rw-r--r-- | include/features.h | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/include/features.h b/include/features.h new file mode 100644 index 0000000000..d1f4ae3d29 --- /dev/null +++ b/include/features.h @@ -0,0 +1,235 @@ +/* Copyright (C) 1991, 92, 93, 95, 96, 97 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. 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. + _ISOC9X_SOURCE Extensions to ISO C 89 from ISO C 9x. + _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 + _XOPEN_SOURCE Includes POSIX and XPG things. + _XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions. + _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 all but _GNU_SOURCE. + 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_ISOC9X Define ISO C 9X things. + __USE_POSIX Define IEEE Std 1003.1 things. + __USE_POSIX2 Define IEEE Std 1003.2 things. + __USE_POSIX199309 Define IEEE Std 1003.1b things. + __USE_XOPEN Define XPG things. + __USE_XOPEN_EXTENDED Define X/Open Unix things. + __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_ISOC9X +#undef __USE_POSIX +#undef __USE_POSIX2 +#undef __USE_POSIX199309 +#undef __USE_XOPEN +#undef __USE_XOPEN_EXTENDED +#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 _ISOC9X_SOURCE +# define _ISOC9X_SOURCE 1 +# undef _POSIX_SOURCE +# define _POSIX_SOURCE 1 +# undef _POSIX_C_SOURCE +# define _POSIX_C_SOURCE 199309L +# undef _XOPEN_SOURCE +# define _XOPEN_SOURCE 1 +# undef _XOPEN_SOURCE_EXTENDED +# define _XOPEN_SOURCE_EXTENDED 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 _ISOC9X_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 C 9x extension. It will go away as soon + as this standard is officially released. */ +#ifdef _ISOC9X_SOURCE +# define __USE_ISOC9X 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 +# ifdef _XOPEN_SOURCE +# define _POSIX_C_SOURCE 2 +# else +# define _POSIX_C_SOURCE 199309L +# 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 defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 199309L +# define __USE_POSIX199309 1 +#endif + +#ifdef _XOPEN_SOURCE +# define __USE_XOPEN 1 +# ifdef _XOPEN_SOURCE_EXTENDED +# define __USE_XOPEN_EXTENDED 1 +# endif +#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 + +/* 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. Use __GLIBC__ and + __GLIBC_MINOR__ now (see below) when you want to test for a specific + GNU C library version and use the values in <gnu/lib-names.h> to get + the sonames of the shared libraries. */ +#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. */ +#define __GLIBC__ 2 +#define __GLIBC_MINOR__ 1 + + +#if !defined __GNUC__ || __GNUC__ < 2 +/* In GCC version 2, (__extension__ EXPR) will not complain + about GCC extensions used in EXPR under -ansi or -pedantic. */ +# define __extension__ +#endif + + +/* This is here only because every header file already includes this one. */ +#ifndef __ASSEMBLER__ +# include <sys/cdefs.h> +#endif + +/* This is here only because every header file already includes this one. */ +#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). + + 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 + +#endif /* features.h */ |