Reference: https://wiki.gentoo.org/wiki/Project:Toolchain/time64_migration Reference: https://sourceware.org/pipermail/libc-alpha/2022-January/134985.html Signed-off-by: Sam James <sam@xxxxxxxxxx> --- man7/feature_test_macros.7 | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/man7/feature_test_macros.7 b/man7/feature_test_macros.7 index cdd962f7f..d33041001 100644 --- a/man7/feature_test_macros.7 +++ b/man7/feature_test_macros.7 @@ -412,6 +412,15 @@ large files with only a recompilation being required.) 64-bit systems naturally permit file sizes greater than 2 Gigabytes, and on those systems this macro has no effect. .TP +.B _TIME_BITS +Defining this macro with the value 64 +changes the width of +.BR time_t (3type) +to 64-bit which allows handling of timestamps beyond +2038. It is closely related to +.B _FILE_OFFSET_BITS +and depending on implementation, may require it set. +.TP .BR _BSD_SOURCE " (deprecated since glibc 2.20)" Defining this macro with any value causes header files to expose BSD-derived definitions. @@ -854,6 +863,10 @@ main(int argc, char *argv[]) printf("_FILE_OFFSET_BITS defined: %d\en", _FILE_OFFSET_BITS); #endif +#ifdef _TIME_BITS + printf("_TIME_BITS defined: %d\en", _TIME_BITS); +#endif + #ifdef _BSD_SOURCE printf("_BSD_SOURCE defined\en"); #endif -- 2.38.0
