diff options
Diffstat (limited to '')
| -rw-r--r-- | doc/info/chap/introduction.texinfo | 96 | ||||
| -rw-r--r-- | include/slibc/features.h | 63 |
2 files changed, 158 insertions, 1 deletions
diff --git a/doc/info/chap/introduction.texinfo b/doc/info/chap/introduction.texinfo index 5dcf7cb..43f4898 100644 --- a/doc/info/chap/introduction.texinfo +++ b/doc/info/chap/introduction.texinfo @@ -51,6 +51,8 @@ the C programming language. @node Reserved Names @section Reserved Names +@cpindex Reserved names +@cpindex Names, reserved The names of all types, variables, functions and macros, that comes from the @sc{ISO}@tie{}C standard are reserved. Additionally, all names that are @@ -242,3 +244,97 @@ Additionally, @command{slibc} specifies the macro defined, all warnings @command{slibc} defines for header files and functions are disabled. +@command{slibc} also recognises feature-test +macros defined by other projects. + +@table @code +@item _ISOC90_SOURCE +@cpindex @sc{ISO}@tie{}C +@cpindex C90 +@lvindex _ISOC90_SOURCE +Enables functionality from the @sc{ISO}@tie{}C90 +standard, even if the program is not compiled +with C90. + +@item _ISOC99_SOURCE +@cpindex @sc{ISO}@tie{}C +@cpindex C99 +@lvindex _ISOC99_SOURCE +Enables functionality from the @sc{ISO}@tie{}C99 +standard, even if the program is not compiled +with C99. + +@item _ISOC11_SOURCE +@cpindex @sc{ISO}@tie{}C +@cpindex C11 +@lvindex _ISOC11_SOURCE +Enables functionality from the @sc{ISO}@tie{}C11 +standard, even if the program is not compiled +with C11. + +@item _POSIX_SOURCE +@cpindex @sc{POSIX} +@cpindex @sc{ISO}@tie{}C +@lvindex _POSIX_SOURCE +Enables functionality from the @sc{POSIX}.1 +standard (@sc{IEEE} Standard 1003.1) as well +as @sc{ISO}@tie{}C. @code{_POSIX_SOURCE} is +automatically enabled if @code{_POSIX_C_SOURCE} +is defined and has a positive value. + +@item _POSIX_C_SOURCE >= 1L +@cpindex @sc{POSIX} +@lvindex _POSIX_C_SOURCE +Enables functionality from the 1990 edition +of the @sc{POSIX}.1 standard (@sc{IEEE} +Standard 1003.1-1990). + +@item _POSIX_C_SOURCE >= 2L +@cpindex @sc{POSIX} +@lvindex _POSIX_C_SOURCE +Enables functionality from the 1992 edition +of the @sc{POSIX}.2 standard (@sc{IEEE} +Standard 1003.2-1992). + +@item _POSIX_C_SOURCE >= 199309L +@cpindex @sc{POSIX} +@lvindex _POSIX_C_SOURCE +Enables functionality from the 1993 edition +of the @sc{POSIX}.1b standard (@sc{IEEE} +Standard 1003.1b-1993). + +@item _POSIX_C_SOURCE >= 199506L +@cpindex @sc{POSIX} +@lvindex _POSIX_C_SOURCE +Enables functionality from the 1996 edition +of the @sc{POSIX}.1 standard (@sc{ISO}/@sc{IEC} +9945-1: 1996). + +@item _BSD_SOURCE +@cpindex @sc{BSD} +@lvindex _BSD_SOURCE +Enables functionality from @sc{BSD}, as well +as @sc{ISO}@tie{}C, @sc{POSIX}.1, and @sc{POSIX}.2. +Note that some @sc{BSD} function conflicts with +@sc{POSIX}.1. + +@lvindex _BSD_COMPATIBLE_SOURCE +@lvindex _POSIX_COMPATIBLE_SOURCE +To enable the @sc{BSD} functionality that conflicts +with @sc{POSIX}.1 functionality, also define +@code{_BSD_COMPATIBLE_SOURCE}. If you however +prefer to use the @sc{POSIX}.1 functionality, define +@code{_POSIX_COMPATIBLE_SOURCE} to suppress warnings +about conflicts. These two feature-test macros are +specific to @command{slibc}. + +@item _SVID_SOURCE +@cpindex @sc{SVID} +@cpindex System V Interface Description +@lvindex _SVID_SOURCE +Enables functionality from @i{System V Interface +Description} (@sc{SVID}), as well as @sc{ISO}@tie{}C, +@sc{POSIX}.1, @sc{POSIX}.2, and X/Open. + +@end table + diff --git a/include/slibc/features.h b/include/slibc/features.h index e6005f9..d223d76 100644 --- a/include/slibc/features.h +++ b/include/slibc/features.h @@ -40,7 +40,7 @@ /** * Is C99, or newer, used? */ -#if __STDC_VERSION__ >= 199901L +#if __STDC_VERSION__ >= 199901L || defined(_ISOC99_SOURCE) # define __C99__ #endif @@ -54,6 +54,55 @@ /** + * _POSIX_SOURCE is implied if (_POSIX_C_SOURCE >= 1L). + */ +#if !defined(_POSIX_SOURCE) && defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 1L) +# define _POSIX_SOURCE 1 +#endif +#if (!defined(_POSIX_C_SOURCE) || (_POSIX_C_SOURCE <= 0)) && !defined(_POSIX_SOURCE) +# define _POSIX_C_SOURCE 1L +#endif + +/** + * _BSD_SOURCE || _SVID_SOURCE implies _POSIX_C_SOURCE = 2. + */ +#if defined(_BSD_SOURCE) || defined(_SVID_SOURCE) +# if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE < 1L) +# undef _POSIX_C_SOURCE +# endif +# if !defined(_POSIX_C_SOURCE) +# define _POSIX_C_SOURCE 2 +# endif +#endif + +/** + * _SVID_SOURCE implies _XOPEN_SOURCE + */ +#if defined(_SVID_SOURCE) && !defined(_XOPEN_SOURCE) +# define _XOPEN_SOURCE 1 +#endif + +/** + * _BSD_COMPATIBLE_SOURCE requires _BSD_SOURCE. + */ +#if defined(_BSD_COMPATIBLE_SOURCE) && !defined(_BSD_SOURCE) +# if !defined(_SLIBC_SUPPRESS_WARNINGS) +# warning "_BSD_COMPATIBLE_SOURCE is defined, but _BSD_SOURCE is undefined." +# endif +#endif + +/** + * _BSD_COMPATIBLE_SOURCE and _POSIX_COMPATIBLE_SOURCE + * are incompatible. + */ +#if defined(_BSD_COMPATIBLE_SOURCE) && defined(_POSIX_COMPATIBLE_SOURCE) +# if !defined(_SLIBC_SUPPRESS_WARNINGS) +# warning "You should not define both _BSD_COMPATIBLE_SOURCE and _POSIX_COMPATIBLE_SOURCE." +# endif +#endif + + +/** * Feature-test macros that also change that * `_PORTABLE_SOURCE` and `_LIBRARY_HEADER` * is not defined. @@ -142,6 +191,18 @@ /** + * Functions that have a BSD-specification that is conficting + * with the POSIX-specification shall have this attribute. + */ +#if defined(_BSD_SOURCE) && !defined(_POSIX_COMPATIBLE_SOURCE) && !defined(_BSD_COMPATIBLE_SOURCE) +# define __bsd_posix_conflict \ + __warning("The BSD-version of this function is incompatible with the POSIX-version.") +#else +# define __bsd_posix_conflict /* ignore*/ +#endif + + +/** * Format for the `format` GCC function attribute, * for `*printf` functions. */ |