* NEWS: Mention this. * private.h (_TIME_BITS): Default to 64. --- NEWS | 8 ++++++++ private.h | 12 ++++++++++-- 2 files changed, 18 insertions(+), 2 deletions(-) diff --git a/NEWS b/NEWS index bddbd3da..a918aed2 100644 --- a/NEWS +++ b/NEWS @@ -57,6 +57,14 @@ Unreleased, experimental changes number 2438 comes from the 32-bit limit in the year 2038, plus the 400-year Gregorian cycle. (Problem reported by Bradley White.) + On glibc 2.34 and later, which optionally supports 64-bit time_t + on platforms like x86 where time_t was traditionally 32 bits, + default time_t to 64 instead of 32 bits. This lets functions like + localtime support timestamps after the year 2038, and fixes + year-2038 problems in zic when accessing files dated after 2038. + To continue to limit time_t to 32 bits on these platforms, use + "make CFLAGS='-D_TIME_BITS=32'". + In C code, prefer C23 keywords to pre-C23 macros for alignof, bool, false, and true. Also, use the following C23 features if available: __has_include, unreachable. diff --git a/private.h b/private.h index c185d5f3..2c7535d8 100644 --- a/private.h +++ b/private.h @@ -127,8 +127,9 @@ /* Enable strtoimax on pre-C99 Solaris 11. */ #define __EXTENSIONS__ 1 -/* To avoid having 'stat' fail unnecessarily with errno == EOVERFLOW, - enable large files on GNUish systems ... */ +/* Although tzcode does not call 'stat'-like functions directly, stdio + functions may call them. To avoid having them fail unnecessarily + with errno == EOVERFLOW, enable large files on GNUish systems ... */ #ifndef _FILE_OFFSET_BITS # define _FILE_OFFSET_BITS 64 #endif @@ -137,6 +138,13 @@ /* ... and enable large inode numbers on Mac OS X 10.5 and later. */ #define _DARWIN_USE_64_BIT_INODE 1 +/* On GNUish systems where time_t might be 32 or 64 bits, use 64. + This supports a wider time range, and avoids having 'stat'-like + functions fail unnecessarily with errno == EOVERFLOW. */ +#ifndef _TIME_BITS +# define _TIME_BITS 64 +#endif + /* ** Nested includes */ -- 2.37.2