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* NEWS: Reorganize recent code news clarity, and mention tzdist.

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Paul Eggert
2014-08-26 18:49:54 -07:00
parent c72b41e2be
commit 2ba2b160d0
1 changed files with 38 additions and 37 deletions
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75
NEWS
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@ -42,41 +42,15 @@ Unreleased, experimental changes
Changes affecting code
Some crashes have been fixed when zdump or the tz library is given
invalid or outlandish input.
The tz library no longer mishandles leap seconds on platforms with
unsigned time_t in time zones that lack ordinary transitions after 1970.
The tz library is now thread-safe if compiled with THREAD_SAFE defined.
Although not needed for tz's own applications, which are single-threaded,
this supports POSIX better if the tz library is used in multithreaded apps.
Unless NETBSD_INSPIRED is defined to 0, the tz library now supplies
functions that let callers create and use objects representing time zones.
This is intended for applications that need to deal with many time
zones simultaneously, e.g., an application where each thread may be
in a different time zone. The new functions are tzalloc, tzfree,
localtime_rz, mktime_z, and (if STD_INSPIRED is also defined)
posix2time_z and time2posix_z. (Thanks to Alan Barrett and
Jonathan Lennox for helping to debug this.)
The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
already defined, to make it easier to configure on common platforms.
Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
Unless the new macro UNINIT_TRAP is defined to 0, the tz code now
assumes that reading uninitialized memory yields garbage values
but does not cause other problems such as traps.
If TM_GMTOFF is defined and UNINIT_TRAP is not 0, mktime is now
more likely to guess right for ambiguous time stamps near
transitions where tm_isdst does not change.
If HAVE_STRFTIME_L is defined to 1, the tz library now defines
strftime_l for compatibility with recent versions of POSIX.
Only the C locale is supported, though. HAVE_STRFTIME_L defaults
to 1 on recent POSIX versions, and to 0 otherwise.
Unless NETBSD_INSPIRED is defined to 0, the tz library now
supplies functions for creating and using objects that represent
time zones. The new functions are tzalloc, tzfree, localtime_rz,
mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
time2posix_z. They are intended for performance: for example,
localtime_rz (unlike localtime_r) is trivially thread-safe without
locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
functions, and to Alan Barrett and Jonathan Lennox for helping to
debug the change.)
zdump now builds with the tz library unless USE_LTZ is defined to 0,
This lets zdump use tz features even if the system library lacks them.
@ -92,6 +66,33 @@ Unreleased, experimental changes
with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
lacks these two functions.
If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
Although not needed for tz's own applications, which are single-threaded,
this supports POSIX better if the tz library is used in multithreaded apps.
Some crashes have been fixed when zdump or the tz library is given
invalid or outlandish input.
The tz library no longer mishandles leap seconds on platforms with
unsigned time_t in time zones that lack ordinary transitions after 1970.
The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
already defined, to make it easier to configure on common platforms.
Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
assumes that reading uninitialized memory yields garbage values
but does not cause other problems such as traps.
If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
more likely to guess right for ambiguous time stamps near
transitions where tm_isdst does not change.
If HAVE_STRFTIME_L is defined to 1, the tz library now defines
strftime_l for compatibility with recent versions of POSIX.
Only the C locale is supported, though. HAVE_STRFTIME_L defaults
to 1 on recent POSIX versions, and to 0 otherwise.
tzselect -c now uses a hybrid distance measure that works better
in Africa. (Thanks to Alan Barrett for noting the problem.)
@ -145,8 +146,8 @@ Unreleased, experimental changes
and more like the parameters of 'ln'. LINK-FROM has become TARGET,
and LINK-TO has become LINK-NAME.
tz-link.htm mentions Windows Runtime etc. (thanks to Matt Johnson)
and HP-UX's tztab.
tz-link.htm mentions the IETF's tzdist working group; Windows
Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
Some broken URLs have been fixed in the commentary. (Thanks to
Lester Caine.)