From: Uwe Kleine-König <[email protected]>
On most 32bit architectures time_t (and a few other time related types)
are a signed 32bit wide integer type.
As a consequence they can only represent dates between
Fri Dec 13 08:45:52 PM UTC 1901
(-0x80000000 seconds before Jan 1 1970) and
Tue Jan 19 03:14:07 AM UTC 2038
(0x7fffffff seconds after Jan 1 1970). Given that some machines that are
built today have an expected lifetime of >15 years, this needs to be
extended. To to that, define the cpp symbol _TIME_BITS to 64 which
results in some magic in glibc to make time_t (and the few other time
related types) 64 bit wide.
This new switch CONFIG_TIME64 is in the spirit of CONFIG_LFS and only
expected to have the expected effect with glibc. On musl for examples
time_t already defaults to 64bit wide types.
---
Config.in | 10 ++++++++++
Makefile.flags | 1 +
2 files changed, 11 insertions(+)
diff --git a/Config.in b/Config.in
index a98a8b15b854..214eba54630e 100644
--- a/Config.in
+++ b/Config.in
@@ -108,6 +108,16 @@ config LFS
programs that can benefit from large file support include dd, gzip,
cp, mount, tar.
+config TIME64
+ bool "Support 64bit wide time types"
+ default y
+ depends on LFS
+ help
+ Make times later than 2038 representable for several libc syscalls
+ (stat, clk_gettime etc.). Note this switch is specific to glibc and has
+ no effect on platforms that already use 64bit wide time types (i.e. all
+ 64bit archs and some selected 32bit archs (currently riscv and x32)).
+
config PAM
bool "Support PAM (Pluggable Authentication Modules)"
default n
diff --git a/Makefile.flags b/Makefile.flags
index c34356230a9f..e17defbd00f9 100644
--- a/Makefile.flags
+++ b/Makefile.flags
@@ -15,6 +15,7 @@ CPPFLAGS += \
-include include/autoconf.h \
-D_GNU_SOURCE -DNDEBUG \
$(if $(CONFIG_LFS),-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
-D_FILE_OFFSET_BITS=64) \
+ $(if $(CONFIG_TIME64),-D_TIME_BITS=64) \
-DBB_VER=$(squote)$(quote)$(BB_VER)$(quote)$(squote)
CFLAGS += $(call cc-option,-Wall,)
base-commit: e512aeb0fb3c585948ae6517cfdf4a53cf99774d
--
2.39.2
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