diff options
Diffstat (limited to 'newlib/libc/include/sys/features.h')
| -rw-r--r-- | newlib/libc/include/sys/features.h | 294 |
1 files changed, 275 insertions, 19 deletions
diff --git a/newlib/libc/include/sys/features.h b/newlib/libc/include/sys/features.h index cb6d1eb53..1625495f4 100644 --- a/newlib/libc/include/sys/features.h +++ b/newlib/libc/include/sys/features.h @@ -39,6 +39,281 @@ extern "C" { /* Version with trailing underscores for BSD compatibility. */ #define __GNUC_PREREQ__(ma, mi) __GNUC_PREREQ(ma, mi) + +/* + * Feature test macros control which symbols are exposed by the system + * headers. Any of these must be defined before including any headers. + * + * __STRICT_ANSI__ (defined by gcc -ansi, -std=c90, -std=c99, or -std=c11) + * ISO C + * + * _POSIX_SOURCE (deprecated by _POSIX_C_SOURCE=1) + * _POSIX_C_SOURCE >= 1 + * POSIX.1-1990 + * + * _POSIX_C_SOURCE >= 2 + * POSIX.2-1992 + * + * _POSIX_C_SOURCE >= 199309L + * POSIX.1b-1993 Real-time extensions + * + * _POSIX_C_SOURCE >= 199506L + * POSIX.1c-1995 Threads extensions + * + * _POSIX_C_SOURCE >= 200112L + * POSIX.1-2001 and C99 + * + * _POSIX_C_SOURCE >= 200809L + * POSIX.1-2008 + * + * _XOPEN_SOURCE + * POSIX.1-1990 and XPG4 + * + * _XOPEN_SOURCE_EXTENDED + * SUSv1 (POSIX.2-1992 plus XPG4v2) + * + * _XOPEN_SOURCE >= 500 + * SUSv2 (POSIX.1c-1995 plus XSI) + * + * _XOPEN_SOURCE >= 600 + * SUSv3 (POSIX.1-2001 plus XSI) and C99 + * + * _XOPEN_SOURCE >= 700 + * SUSv4 (POSIX.1-2008 plus XSI) + * + * _ISOC99_SOURCE or gcc -std=c99 or g++ -std=c++11 + * ISO C99 + * + * _ISOC11_SOURCE or gcc -std=c11 or g++ -std=c++11 + * ISO C11 + * + * _ATFILE_SOURCE (implied by _POSIX_C_SOURCE >= 200809L) + * "at" functions + * + * _LARGEFILE_SOURCE (deprecated by _XOPEN_SOURCE >= 500) + * fseeko, ftello + * + * _GNU_SOURCE + * All of the above plus GNU extensions + * + * _BSD_SOURCE (deprecated by _DEFAULT_SOURCE) + * _SVID_SOURCE (deprecated by _DEFAULT_SOURCE) + * _DEFAULT_SOURCE (or none of the above) + * POSIX-1.2008 with BSD and SVr4 extensions + */ + +#ifdef _GNU_SOURCE +#undef _ATFILE_SOURCE +#define _ATFILE_SOURCE 1 +#undef _DEFAULT_SOURCE +#define _DEFAULT_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 +#endif /* _GNU_SOURCE */ + +#if defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || \ + (!defined(__STRICT_ANSI__) && !defined(_ANSI_SOURCE) && \ + !defined(_ISOC99_SOURCE) && !defined(_POSIX_SOURCE) && \ + !defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)) +#undef _DEFAULT_SOURCE +#define _DEFAULT_SOURCE 1 +#endif + +#if defined(_DEFAULT_SOURCE) +#undef _POSIX_SOURCE +#define _POSIX_SOURCE 1 +#undef _POSIX_C_SOURCE +#define _POSIX_C_SOURCE 200809L +#endif + +#if !defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) && \ + ((!defined(__STRICT_ANSI__) && !defined(_ANSI_SOURCE)) || \ + (_XOPEN_SOURCE - 0) >= 500) +#define _POSIX_SOURCE 1 +#if !defined(_XOPEN_SOURCE) || (_XOPEN_SOURCE - 0) >= 700 +#define _POSIX_C_SOURCE 200809L +#elif (_XOPEN_SOURCE - 0) >= 600 +#define _POSIX_C_SOURCE 200112L +#elif (_XOPEN_SOURCE - 0) >= 500 +#define _POSIX_C_SOURCE 199506L +#elif (_XOPEN_SOURCE - 0) < 500 +#define _POSIX_C_SOURCE 2 +#endif +#endif + +#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200809 +#undef _ATFILE_SOURCE +#define _ATFILE_SOURCE 1 +#endif + +/* + * The following private macros are used throughout the headers to control + * which symbols should be exposed. They are for internal use only, as + * indicated by the leading double underscore, and must never be used outside + * of these headers. + * + * __POSIX_VISIBLE + * any version of POSIX.1; enabled by default, or with _POSIX_SOURCE, + * any value of _POSIX_C_SOURCE, or _XOPEN_SOURCE >= 500. + * + * __POSIX_VISIBLE >= 2 + * POSIX.2-1992; enabled by default, with _POSIX_C_SOURCE >= 2, + * or _XOPEN_SOURCE >= 500. + * + * __POSIX_VISIBLE >= 199309 + * POSIX.1b-1993; enabled by default, with _POSIX_C_SOURCE >= 199309L, + * or _XOPEN_SOURCE >= 500. + * + * __POSIX_VISIBLE >= 199506 + * POSIX.1c-1995; enabled by default, with _POSIX_C_SOURCE >= 199506L, + * or _XOPEN_SOURCE >= 500. + * + * __POSIX_VISIBLE >= 200112 + * POSIX.1-2001; enabled by default, with _POSIX_C_SOURCE >= 200112L, + * or _XOPEN_SOURCE >= 600. + * + * __POSIX_VISIBLE >= 200809 + * POSIX.1-2008; enabled by default, with _POSIX_C_SOURCE >= 200809L, + * or _XOPEN_SOURCE >= 700. + * + * __XSI_VISIBLE + * XPG4 XSI extensions; enabled with any version of _XOPEN_SOURCE. + * + * __XSI_VISIBLE >= 4 + * SUSv1 XSI extensions; enabled with both _XOPEN_SOURCE and + * _XOPEN_SOURCE_EXTENDED together. + * + * __XSI_VISIBLE >= 500 + * SUSv2 XSI extensions; enabled with _XOPEN_SOURCE >= 500. + * + * __XSI_VISIBLE >= 600 + * SUSv3 XSI extensions; enabled with _XOPEN_SOURCE >= 600. + * + * __XSI_VISIBLE >= 700 + * SUSv4 XSI extensions; enabled with _XOPEN_SOURCE >= 700. + * + * __ISO_C_VISIBLE >= 1999 + * ISO C99; enabled with gcc -std=c99 or newer (on by default since GCC 5), + * g++ -std=c++11 or newer (on by default since GCC 6), or with + * _ISOC99_SOURCE, _POSIX_C_SOURCE >= 200112L, or _XOPEN_SOURCE >= 600. + * + * __ISO_C_VISIBLE >= 2011 + * ISO C11; enabled with gcc -std=c11 or newer (on by default since GCC 5), + * g++ -std=c++11 or newer (on by default since GCC 6), or with + * _ISOC11_SOURCE. + * + * __ATFILE_VISIBLE + * "at" functions; enabled by default, with _ATFILE_SOURCE, + * _POSIX_C_SOURCE >= 200809L, or _XOPEN_SOURCE >= 700. + * + * __LARGEFILE_VISIBLE + * fseeko, ftello; enabled with _LARGEFILE_SOURCE or _XOPEN_SOURCE >= 500. + * + * __BSD_VISIBLE + * BSD extensions; enabled by default, or with _BSD_SOURCE. + * + * __SVID_VISIBLE + * SVr4 extensions; enabled by default, or with _SVID_SOURCE. + * + * __MISC_VISIBLE + * Extensions found in both BSD and SVr4 (shorthand for + * (__BSD_VISIBLE || __SVID_VISIBLE)), or newlib-specific + * extensions; enabled by default. + * + * __GNU_VISIBLE + * GNU extensions; enabled with _GNU_SOURCE. + * + * In all cases above, "enabled by default" means either by defining + * _DEFAULT_SOURCE, or by not defining any of the public feature test macros. + * Defining _GNU_SOURCE makes all of the above avaliable. + */ + +#ifdef _ATFILE_SOURCE +#define __ATFILE_VISIBLE 1 +#else +#define __ATFILE_VISIBLE 0 +#endif + +#ifdef _DEFAULT_SOURCE +#define __BSD_VISIBLE 1 +#else +#define __BSD_VISIBLE 0 +#endif + +#ifdef _GNU_SOURCE +#define __GNU_VISIBLE 1 +#else +#define __GNU_VISIBLE 0 +#endif + +#if defined(_ISOC11_SOURCE) || \ + (__STDC_VERSION__ - 0) >= 201112L || (__cplusplus - 0) >= 201103L +#define __ISO_C_VISIBLE 2011 +#elif defined(_ISOC99_SOURCE) || \ + (__STDC_VERSION__ - 0) >= 199901L || (_POSIX_C_SOURCE - 0) >= 200112L +#define __ISO_C_VISIBLE 1999 +#else +#define __ISO_C_VISIBLE 1990 +#endif + +#if defined(_LARGEFILE_SOURCE) || (_XOPEN_SOURCE - 0) >= 500 +#define __LARGEFILE_VISIBLE 1 +#else +#define __LARGEFILE_VISIBLE 0 +#endif + +#ifdef _DEFAULT_SOURCE +#define __MISC_VISIBLE 1 +#else +#define __MISC_VISIBLE 0 +#endif + +#if (_POSIX_C_SOURCE - 0) >= 200809L +#define __POSIX_VISIBLE 200809 +#elif (_POSIX_C_SOURCE - 0) >= 200112L +#define __POSIX_VISIBLE 200112 +#elif (_POSIX_C_SOURCE - 0) >= 199506L +#define __POSIX_VISIBLE 199506 +#elif (_POSIX_C_SOURCE - 0) >= 199309L +#define __POSIX_VISIBLE 199309 +#elif (_POSIX_C_SOURCE - 0) >= 2 || defined(_XOPEN_SOURCE) +#define __POSIX_VISIBLE 199209 +#elif defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) +#define __POSIX_VISIBLE 199009 +#else +#define __POSIX_VISIBLE 0 +#endif + +#ifdef _DEFAULT_SOURCE +#define __SVID_VISIBLE 1 +#else +#define __SVID_VISIBLE 0 +#endif + +#if (_XOPEN_SOURCE - 0) >= 700 +#define __XSI_VISIBLE 700 +#elif (_XOPEN_SOURCE - 0) >= 600 +#define __XSI_VISIBLE 600 +#elif (_XOPEN_SOURCE - 0) >= 500 +#define __XSI_VISIBLE 500 +#elif defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED) +#define __XSI_VISIBLE 4 +#elif defined(_XOPEN_SOURCE) +#define __XSI_VISIBLE 1 +#else +#define __XSI_VISIBLE 0 +#endif + /* RTEMS adheres to POSIX -- 1003.1b with some features from annexes. */ #ifdef __rtems__ @@ -206,25 +481,6 @@ extern "C" { #endif /* __CYGWIN__ */ -/* Per the permission given in POSIX.1-2008 section 2.2.1, define - * _POSIX_C_SOURCE if _XOPEN_SOURCE is defined and _POSIX_C_SOURCE is not. - * (_XOPEN_SOURCE indicates that XSI extensions are desired by an application.) - * This permission is first granted in 2008, but use it for older ones, also. - * Allow for _XOPEN_SOURCE to be empty (from the earliest form of it, before it - * was required to have specific values). - */ -#if !defined(_POSIX_C_SOURCE) && defined(_XOPEN_SOURCE) - #if (_XOPEN_SOURCE - 0) == 700 /* POSIX.1-2008 */ - #define _POSIX_C_SOURCE 200809L - #elif (_XOPEN_SOURCE - 0) == 600 /* POSIX.1-2001 or 2004 */ - #define _POSIX_C_SOURCE 200112L - #elif (_XOPEN_SOURCE - 0) == 500 /* POSIX.1-1995 */ - #define _POSIX_C_SOURCE 199506L - #elif (_XOPEN_SOURCE - 0) < 500 /* really old */ - #define _POSIX_C_SOURCE 2 - #endif -#endif - #ifdef __cplusplus } #endif |