Updated: tzcode 2022g

Updated: tzcode 2022g

[Cygwin tzcode/tzdata Maintainer]

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The following packages have been upgraded in the Cygwin distribution:

* tzcode	2022g

The Time Zone Database (often called tz, tzdb, or zoneinfo) contains
data that represents the history of local time for many locations around
the world, and supports conversion of UTC time to local time at those
locations to allow display of those local times. It is updated
periodically to reflect changes made by political bodies to summer
daylight saving time rules, UTC offsets, and time zone boundaries.
The tzcode package provides the tzselect, zdump, and zic utilities.

For more information, see the project home page:

	https://www.iana.org/time-zones

For more details on changes, see the announcement or below:

	https://mm.icann.org/pipermail/tz-announce/2022-November/000076.html


Release 2022g - 2022-11-29 08:58:31 -0800

Briefly:
    C89 is now deprecated; please use C99 or later.
    Portability fixes for AIX, libintl, MS-Windows, musl, z/OS
    In C code, use more C23 features if available.
    C23 timegm now supported by default
    Fixes for unlikely integer overflows

Changes to code

    Although tzcode still works with C89, bugs found in recent routine
    maintenance indicate that bitrot has set in and that in practice
    C89 is no longer used to build tzcode.  As it is a maintenance
    burden, support for C89 is planned to be removed soon.  Instead,
    please use compilers compatible with C99, C11, C17, or C23.

    timegm, which tzcode implemented in 1989, will finally be
    standardized 34 years later as part of C23, so timegm is now
    supported even if STD_INSPIRED is not defined.

    Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone.
    (Problem reported by Đoàn Trần Công Danh.)

    Fix bug in zic on hosts where malloc(0) yields NULL on success.
    (Problem reported by Tim McBrayer for AIX 6.1.)

    Fix zic configuration to avoid linkage failures on some platforms.
    (Problems reported by Gilmore Davidson and Igor Ivanov.)

    Work around MS-Windows nmake incompatibility with POSIX.
    (Problem reported by Manuela Friedrich.)

    Port mktime and strftime to debugging platforms where accessing
    uninitialized data has undefined behavior (strftime problem
    reported by Robert Elz).

    Check more carefully for unlikely integer overflows, preferring
    C23 <stdckdint.h> to overflow checking by hand, as the latter has
    had obscure bugs.

Changes to build procedure

    New Makefile rule check_mild that skips checking whether Link
    lines are in the file 'backward'.  (Inspired by a suggestion from
    Stephen Colebourne.)