diff options
Diffstat (limited to 'doc/autoconf.texi')
| -rw-r--r-- | doc/autoconf.texi | 34 |
1 files changed, 11 insertions, 23 deletions
diff --git a/doc/autoconf.texi b/doc/autoconf.texi index b3c708e8..0f3047b3 100644 --- a/doc/autoconf.texi +++ b/doc/autoconf.texi @@ -8808,18 +8808,20 @@ if possible. These types may include @code{blkcnt_t}, @code{dev_t}, Also, arrange for a @command{configure} option @code{--enable-year2038} to request widening the type @code{time_t} as needed to represent file -wand other timestamps after January 2038. This widening is possible +wand other timestamps after mid-January 2038. This widening is possible only on 32-bit GNU/Linux x86 and ARM systems with glibc 2.34 or later. If year-2038 support is requested but @command{configure} fails to find a way to widen @code{time_t} and inspection of the system suggests that this feature is available somehow, @command{configure} will error out. If you want the default to be @code{--enable-year2038}, you can use -@code{AC_SYS_YEAR2038} instead of @code{AC_SYS_LARGEFILE}. +@code{AC_SYS_YEAR2038} or @code{AC_SYS_YEAR2038_RECOMMENDED} +instead of @code{AC_SYS_LARGEFILE}. In other words, older packages that have long used @code{AC_SYS_LARGEFILE} can have year-2038 support on 32-bit GNU/Linux x86 and ARM systems either by regenerating @file{configure} with current Autoconf and configuring with -@option{--enable-year2038}, or by using @code{AC_SYS_YEAR2038} and -configuring without @option{--disable-year2038}. +@option{--enable-year2038}, or by using @code{AC_SYS_YEAR2038} or +@code{AC_SYS_YEAR2038_RECOMMENDED} and configuring without +@option{--disable-year2038}. A future version of Autoconf might change the @code{AC_SYS_LARGEFILE} default to @code{--enable-year2038}; if and when that happens, @code{AC_SYS_LARGEFILE} and @code{AC_SYS_YEAR2038} will become equivalent. @@ -8886,19 +8888,6 @@ library, enabling or disabling the application's large-file support may break binary compatibility with that library. @end defmac -@defmac AC_SYS_LARGEFILE_REQUIRED -@acindex{SYS_LARGEFILE_REQUIRED} -This macro has the same effect as @code{AC_SYS_LARGEFILE}, -but also declares that the program being configured -requires support for large files. -If a large @code{off_t} is unavailable, -@command{configure} will error out. -The @option{--disable-largefile} option will not be available. - -Large-file and year-2038 support for applications and libraries should -be configured compatibly. @xref{AC_SYS_LARGEFILE}. -@end defmac - @anchor{AC_SYS_LONG_FILE_NAMES} @defmac AC_SYS_LONG_FILE_NAMES @acindex{SYS_LONG_FILE_NAMES} @@ -8927,14 +8916,13 @@ applications and libraries should be configured compatibly. @xref{AC_SYS_LARGEFILE}. @end defmac -@defmac AC_SYS_YEAR2038_REQUIRED -@acindex{SYS_YEAR2038_REQUIRED} +@defmac AC_SYS_YEAR2038_RECOMMENDED +@acindex{SYS_YEAR2038_RECOMMENDED} This macro has the same effect as @code{AC_SYS_YEAR2038}, but also declares that the program being configured -requires support for timestamps after mid-January of 2038. -If a large @code{time_t} is unavailable, -@command{configure} will unconditionally error out. -The @option{--disable-year2038} option will not be available. +should support timestamps after mid-January 2038. +If a large @code{time_t} is unavailable, @command{configure} will error +out unless the @option{--disable-year2038} option is specified. Year-2038 support for applications and libraries should be configured compatibly. @xref{AC_SYS_YEAR2038}. |