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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2023-04-20 14:13:17 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2023-05-07 18:57:06 +0200 |
| commit | 40fa8eb998e27529fcd59830eb163b43658f9e81 (patch) | |
| tree | 2b9c9be2b1fcf5f947f25d06dc7dc4859ee4ed00 /Makefile.flags | |
| parent | 07f8b6feac2ff80793394b5b5acff5cd149d7fb2 (diff) | |
| download | busybox-40fa8eb998e27529fcd59830eb163b43658f9e81.tar.gz | |
build system: Make it possible to build with 64bit time_t
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.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'Makefile.flags')
| -rw-r--r-- | Makefile.flags | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Makefile.flags b/Makefile.flags index 1cec5ba20..e4cd658fd 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,) |