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Diffstat (limited to 'REORG.TODO/include/features.h')
| -rw-r--r-- | REORG.TODO/include/features.h | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/REORG.TODO/include/features.h b/REORG.TODO/include/features.h new file mode 100644 index 0000000000..972cbd2b5d --- /dev/null +++ b/REORG.TODO/include/features.h @@ -0,0 +1,450 @@ +/* Copyright (C) 1991-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#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. + _ISOC11_SOURCE Extensions to ISO C99 from ISO C11. + __STDC_WANT_LIB_EXT2__ + Extensions to ISO C99 from TR 27431-2:2010. + __STDC_WANT_IEC_60559_BFP_EXT__ + Extensions to ISO C11 from TS 18661-1:2014. + __STDC_WANT_IEC_60559_FUNCS_EXT__ + Extensions to ISO C11 from TS 18661-4:2015. + __STDC_WANT_IEC_60559_TYPES_EXT__ + Extensions to ISO C11 from TS 18661-3:2015. + + _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. + _ATFILE_SOURCE Additional *at interfaces. + _GNU_SOURCE All of the above, plus GNU extensions. + _DEFAULT_SOURCE The default set of features (taking precedence over + __STRICT_ANSI__). + + _FORTIFY_SOURCE Add security hardening to many library functions. + Set to 1 or 2; 2 performs stricter checks than 1. + + _REENTRANT, _THREAD_SAFE + Obsolete; equivalent to _POSIX_C_SOURCE=199506L. + + The `-ansi' switch to the GNU C compiler, and standards conformance + options such as `-std=c99', define __STRICT_ANSI__. If none of + these are defined, or if _DEFAULT_SOURCE is defined, the default is + to have _POSIX_SOURCE set to one and _POSIX_C_SOURCE set to + 200809L, as well as enabling miscellaneous functions from BSD and + SVID. 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: + + __GLIBC_USE (F) Define things from feature set F. This is defined + to 1 or 0; the subsequent macros are either defined + or undefined, and those tests should be moved to + __GLIBC_USE. + __USE_ISOC11 Define ISO C11 things. + __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_XOPEN2KXSI Define XPG6 XSI things. + __USE_XOPEN2K8 Define XPG7 things. + __USE_XOPEN2K8XSI Define XPG7 XSI 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_MISC Define things from 4.3BSD or System V Unix. + __USE_ATFILE Define *at interfaces and AT_* constants for them. + __USE_GNU Define GNU extensions. + __USE_FORTIFY_LEVEL Additional security measures used, according to level. + + 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. + + ISO C feature test macros depend on the definition of the macro + when an affected header is included, not when the first system + header is included, and so they are handled in + <bits/libc-header-start.h>, which does not have a multiple include + guard. Feature test macros that can be handled from the first + system header included are handled here. */ + + +/* Undefine everything, so we get a clean slate. */ +#undef __USE_ISOC11 +#undef __USE_ISOC99 +#undef __USE_ISOC95 +#undef __USE_ISOCXX11 +#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_XOPEN2KXSI +#undef __USE_XOPEN2K8 +#undef __USE_XOPEN2K8XSI +#undef __USE_LARGEFILE +#undef __USE_LARGEFILE64 +#undef __USE_FILE_OFFSET64 +#undef __USE_MISC +#undef __USE_ATFILE +#undef __USE_GNU +#undef __USE_FORTIFY_LEVEL +#undef __KERNEL_STRICT_NAMES +#undef __GLIBC_USE_DEPRECATED_GETS + +/* Suppress kernel-name space pollution unless user expressedly asks + for it. */ +#ifndef _LOOSE_KERNEL_NAMES +# define __KERNEL_STRICT_NAMES +#endif + +/* Convenience macro to test the version of gcc. + Use like this: + #if __GNUC_PREREQ (2,8) + ... code requiring gcc 2.8 or later ... + #endif + Note: only works for GCC 2.0 and later, because __GNUC_MINOR__ was + added in 2.0. */ +#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 + +/* Similarly for clang. Features added to GCC after version 4.2 may + or may not also be available in clang, and clang's definitions of + __GNUC(_MINOR)__ are fixed at 4 and 2 respectively. Not all such + features can be queried via __has_extension/__has_feature. */ +#if defined __clang_major__ && defined __clang_minor__ +# define __glibc_clang_prereq(maj, min) \ + ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min)) +#else +# define __glibc_clang_prereq(maj, min) 0 +#endif + +/* Whether to use feature set F. */ +#define __GLIBC_USE(F) __GLIBC_USE_ ## F + +/* _BSD_SOURCE and _SVID_SOURCE are deprecated aliases for + _DEFAULT_SOURCE. If _DEFAULT_SOURCE is present we do not + issue a warning; the expectation is that the source is being + transitioned to use the new macro. */ +#if (defined _BSD_SOURCE || defined _SVID_SOURCE) \ + && !defined _DEFAULT_SOURCE +# warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" +# undef _DEFAULT_SOURCE +# define _DEFAULT_SOURCE 1 +#endif + +/* If _GNU_SOURCE was defined by the user, turn on all the other features. */ +#ifdef _GNU_SOURCE +# undef _ISOC95_SOURCE +# define _ISOC95_SOURCE 1 +# undef _ISOC99_SOURCE +# define _ISOC99_SOURCE 1 +# undef _ISOC11_SOURCE +# define _ISOC11_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 _DEFAULT_SOURCE +# define _DEFAULT_SOURCE 1 +# undef _ATFILE_SOURCE +# define _ATFILE_SOURCE 1 +#endif + +/* If nothing (other than _GNU_SOURCE and _DEFAULT_SOURCE) is defined, + define _DEFAULT_SOURCE. */ +#if (defined _DEFAULT_SOURCE \ + || (!defined __STRICT_ANSI__ \ + && !defined _ISOC99_SOURCE \ + && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE \ + && !defined _XOPEN_SOURCE)) +# undef _DEFAULT_SOURCE +# define _DEFAULT_SOURCE 1 +#endif + +/* This is to enable the ISO C11 extension. */ +#if (defined _ISOC11_SOURCE \ + || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L)) +# define __USE_ISOC11 1 +#endif + +/* This is to enable the ISO C99 extension. */ +#if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \ + || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L)) +# define __USE_ISOC99 1 +#endif + +/* This is to enable the ISO C90 Amendment 1:1995 extension. */ +#if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \ + || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L)) +# define __USE_ISOC95 1 +#endif + +/* This is to enable compatibility for ISO C++11. + + So far g++ does not provide a macro. Check the temporary macro for + now, too. */ +#if ((defined __cplusplus && __cplusplus >= 201103L) \ + || defined __GXX_EXPERIMENTAL_CXX0X__) +# define __USE_ISOCXX11 1 +#endif + +/* If none of the ANSI/POSIX macros are defined, or if _DEFAULT_SOURCE + is defined, use POSIX.1-2008 (or another version depending on + _XOPEN_SOURCE). */ +#ifdef _DEFAULT_SOURCE +# if !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE +# define __USE_POSIX_IMPLICITLY 1 +# endif +# undef _POSIX_SOURCE +# define _POSIX_SOURCE 1 +# undef _POSIX_C_SOURCE +# define _POSIX_C_SOURCE 200809L +#endif + +#if ((!defined __STRICT_ANSI__ \ + || (defined _XOPEN_SOURCE && (_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 + +/* Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be + defined in all multithreaded code. GNU libc has not required this + for many years. We now treat them as compatibility synonyms for + _POSIX_C_SOURCE=199506L, which is the earliest level of POSIX with + comprehensive support for multithreaded code. Using them never + lowers the selected level of POSIX conformance, only raises it. */ +#if ((!defined _POSIX_C_SOURCE || (_POSIX_C_SOURCE - 0) < 199506L) \ + && (defined _REENTRANT || defined _THREAD_SAFE)) +# define _POSIX_SOURCE 1 +# undef _POSIX_C_SOURCE +# define _POSIX_C_SOURCE 199506L +#endif + +#if (defined _POSIX_SOURCE \ + || (defined _POSIX_C_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 - 0) >= 199309L +# define __USE_POSIX199309 1 +#endif + +#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L +# define __USE_POSIX199506 1 +#endif + +#if defined _POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L +# define __USE_XOPEN2K 1 +# undef __USE_ISOC95 +# define __USE_ISOC95 1 +# undef __USE_ISOC99 +# define __USE_ISOC99 1 +#endif + +#if defined _POSIX_C_SOURCE && (_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 +# define __USE_XOPEN2K8XSI 1 +# endif +# define __USE_XOPEN2K 1 +# define __USE_XOPEN2KXSI 1 +# undef __USE_ISOC95 +# define __USE_ISOC95 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 _DEFAULT_SOURCE +# define __USE_MISC 1 +#endif + +#ifdef _ATFILE_SOURCE +# define __USE_ATFILE 1 +#endif + +#ifdef _GNU_SOURCE +# define __USE_GNU 1 +#endif + +#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 +# if !defined __OPTIMIZE__ || __OPTIMIZE__ <= 0 +# warning _FORTIFY_SOURCE requires compiling with optimization (-O) +# elif !__GNUC_PREREQ (4, 1) +# warning _FORTIFY_SOURCE requires GCC 4.1 or later +# elif _FORTIFY_SOURCE > 1 +# define __USE_FORTIFY_LEVEL 2 +# else +# define __USE_FORTIFY_LEVEL 1 +# endif +#endif +#ifndef __USE_FORTIFY_LEVEL +# define __USE_FORTIFY_LEVEL 0 +#endif + +/* The function 'gets' existed in C89, but is impossible to use + safely. It has been removed from ISO C11 and ISO C++14. Note: for + compatibility with various implementations of <cstdio>, this test + must consider only the value of __cplusplus when compiling C++. */ +#if defined __cplusplus ? __cplusplus >= 201402L : defined __USE_ISOC11 +# define __GLIBC_USE_DEPRECATED_GETS 0 +#else +# define __GLIBC_USE_DEPRECATED_GETS 1 +#endif + +/* Get definitions of __STDC_* predefined macros, if the compiler has + not preincluded this header automatically. */ +#include <stdc-predef.h> + +/* 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__ 25 + +#define __GLIBC_PREREQ(maj, min) \ + ((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min)) + +/* This is here only because every header file already includes this one. */ +#ifndef __ASSEMBLER__ +# ifndef _SYS_CDEFS_H +# include <sys/cdefs.h> +# 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 +# define __USE_LARGEFILE64 1 +# endif + +#endif /* !ASSEMBLER */ + +/* Decide whether we can define 'extern inline' functions in headers. */ +#if __GNUC_PREREQ (2, 7) && defined __OPTIMIZE__ \ + && !defined __OPTIMIZE_SIZE__ && !defined __NO_INLINE__ \ + && defined __extern_inline +# define __USE_EXTERN_INLINES 1 +#endif + + +/* This is here only because every header file already includes this one. + Get the definitions of all the appropriate `__stub_FUNCTION' symbols. + <gnu/stubs.h> contains `#define __stub_FUNCTION' when FUNCTION is a stub + that will always return failure (and set errno to ENOSYS). */ +#include <gnu/stubs.h> + + +#endif /* features.h */ |