This works around Gnome bug 730332
<https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
zic 2014c introduced the idea of generating a transition at the
minimum time value -2**63, to avoid ambiguities about what to do
before the first real transition. Through Glib release 2.40, the
interval_end function of Glib's gtimezone.c subtracts one from
this, to find the end time of the zeroth interval (i.e., the
interval containing all the "early" time stamps); this subtraction
typically overflows and wraps around to 2**63 - 1, which causes
Glib to go off the rails and assume that all time stamps are
"early". For example, Glib computes Sao Paulo time stamps as if
Brazil's circa-1913 rules were still in effect.
(Thanks to Leonardo Chiquitto for reporting the bug.)
Work around the bug by not generating time stamps equal to -2**63.
Come to think of it, time stamps before the Big Bang are physically
suspect anyway, so don't generate time stamps before the Big Bang.
* Makefile (GCC_DEBUG_FLAGS): Add comment re BIG_BANG.
* NEWS, zic.8 (NOTES): Document this.
* zic.c (BIG_BANG): New macro.
(big_bang_time): New constant.
(writezone, outzone, addtt): Compare to big_bang_time, not to
min_time, when deciding whether to output a time stamp.
* Makefile (GCC_DEBUG_FLAGS): Add -Wno-address and -Wno-cast-qual.
Otherwise, GCC 4.8.1 complains about some of the following changes.
* localtime.c (wildabbr): Now const. This is a tiny bit more
efficient, POSIX allows it, and the ALL_STATE simplifications
below make use of it. All uses changed to cast if needed.
(settzname, tzload, localsub, gmtsub, timesub, time2sub, time1):
Protect less code with ALL_STATE; this is simpler and doesn't
change behavior (or, these days, efficiency).
(time1): Simplify the PCTS ifdef, and explain what PCTS is.
The current tzdata now goes to 17, which is uncomfortably close to
the NOSOLAR limit of 20.
* Makefile (CFLAGS): Remove NOSOLAR comment.
* tzfile.h (TZ_MAX_TYPES): Ignore NOSOLAR; always default to 256.
* NEWS: Document this.
Problem reported by Patrick 'P. J.' McDermott in
<http://mm.icann.org/pipermail/tz/2013-October/020441.html>.
This code is quite a bit different from what he proposed.
* tzselect.ksh: Rewrite so that it should work with /bin/sh on
common platforms. For portability to Solaris 9 /bin/sh, use
`...`, not $(...), and avoid $((...)).
(doselect): New function. Use this instead of plain 'select'.
Callers no longer need to worry whether it sets the var to empty.
* Makefile, NEWS: Document this.
* Makefile: Let the user override AR, and build libtz.a before
installing it, as suggested by Michael Forney in
<https://github.com/eggert/tz/pull/3>. Also, let the user
override RANLIB. Modernize a bit by assuming POSIX.2-1992 or
later; this is safe nowadays and simplifies the libtz.a business.
And treat 'leapseconds' more like we used to, since it's
machine-independent a 'make clean' doesn't need to remove it.
(TZLIB): Remove.
(AR, RANLIB): New macros.
(TABDATA): Add leapseconds, so that 'make' builds it by default.
(DATA): Remove leapseconds, since $(TABDATA) now has it.
(all): Depend on libtz.a, not $(LIBOBJS).
(install): Install libtz.a using 'cp', like other files.
Also invoke $(RANLIB) on it, after installing.
Do not assume that TZDIR is not overridden.
(install, INSTALL, check_time_t_alternatives): Use 'mkdir -p', as
it's safe to assume nowadays (standardized in POSIX.2-1992).
(install, INSTALL): Prefer 'cp -f' to 'rm' followed by 'cp', as
it's safe to assume 'cp -f' nowadays (also standardized in POSIX.2-1992).
(libtz.a): Rename from $(DESTDIR)$(TZLIB), since we now build it here.
Use $(AR) rather than ar.
Use $(RANLIB) rather than trying to guess it.
(clean_misc): Do not remove 'leapseconds', as it's machine-independent.
(maintainer-clean): Remove 'leapseconds' here instead.
(clean, check_public): Standardize on 'rm -fr' rather than 'rm -f -r';
formerly the makefile was inconsistent.
(set-timestamps.out): Don't ignore failurs of the actual touch command.
MinGW problem reported by Theo Veenker in
<http://mm.icann.org/pipermail/tz/2013-September/020378.html>.
The patched code should work even on POSIXish hosts
where 'link' and 'symlink' fail for whatever reason,
e.g., if the destination file system is VFAT.
Also, the patch fixes some bugs when symlinks are used.
* Makefile (CFLAGS): Mention HAVE_LINK in the comment.
(TZDSRCS): Add asctime.o, since MinGW lacks asctime.
(TZDOBJS): Add asctime.c.
* private.h (HAVE_LINK): Default to 1.
* zic.c (link) [!HAVE_LINK]: New macro.
(symlink) [!HAVE_SYMLINK]: New macro.
(dolink): Fix some bugs when 'link' fails but 'symlink' succeeds.
Fall back on copying when both fail.
* NEWS: Document the above.
Problem with leapseconds reported by Matt Burgess in
<http://mm.icann.org/pipermail/tz/2013-September/020379.html>
with a followup by Ian Abbott in
<http://mm.icann.org/pipermail/tz/2013-September/020383.html>.
* Makefile (MANTXTS): New macro.
(maintainer-clean): Use it.
(DOCS): Add it.
(DATA): Add 'leapseconds'.
(LEAP_DEPS): New macro.
(leapseconds): Use it.
(public): Don't depend on set-timestamps; each tarball does that
individually now, to allow for more parallelization.
(date.1.txt, newctime.3.txt, newstrftime.3.txt, newtzset.3.txt)
(time2posix.3.txt, tzfile.5.txt, tzselect.8.txt, zdump.8.txt)
(zic.8.txt): Depend on the corresponding non-.txt file.
$(MANTXTS): New rule.
(set-timestamps.out): Rename from set-timestamps, and make it a file,
so that it has its own timestamp; this avoids useless rework.
Depend on $(ENCHILADA) and ignore files under Git that are not
also listed in $(ENCHILADA). Set the timestamp of 'leapseconds'
and each $(MANTXTS) to be the maximum of its dependencies, to avoid
timestamp churn in future tarballs. Prefer touch -m, as we don't
care about access time here.
(tzcode$(VERSION).tar.gz, tzdata$(VERSION).tar.gz):
Depend on set-timestamps.out rather than the individual files,
so timestamps are set before creating the tarballs even when
make is parallelized.
(tzcode$(VERSION).tar.gz): Don't mention *.[1-8].txt explicitly,
since we now get $(MANTXTS) via $(DOCS).
* NEWS: Document the above.
* Makefile (COMMON): Move README here ...
(DOCS): ... from here, as it talks about the public-domain status
of the files, and this should be in both tarballs.
* README: Add intro. Mention public-domain status of files.
Remove and reorganize some obsolete text, e.g., move 1989 release
info from here to NEWS's tail.
* NEWS: Document the above.
* Makefile (set-timestamps): Use git's tformat rather than format,
to port to strict POSIX hosts where `` output in shell scripts
cannot end in a non-newline. Use git diff --quiet rather than git
diff --name-only, as it's simpler. Use touch -c for safety, and
-m to avoid setting last-access time, which we don't care about.
Diagnose files that don't match repository.
* NEWS: Document this.
Further testing found that it was incompatible with Ubuntu 12.04 glibc
so this feature requires redesign and more testing.
* Makefile (ZFLAGS): Remove comment about name and version info.
Make it an empty var instead.
* tzfile.5, tzfile.h: Remove description of meta-information.
* zic.8: Remove options -n and -o.
* zic.c: Don't include <stddef.h>.
(genoption, genoptions, genname, addgenoption, writevalue): Remove.
(usage, main, writezone): Remove support for -n and -o.
This was experimental, and it appears that the tzwinnow
approach will be better. We need to cut a new stable
release soon, and the -t option might make it harder to
integrate tzwinnow later, so let's omit -t for now.
* .gitignore: Remove time.tab.
* Makefile (ZONETABTYPE): Remove. All uses removed.
(time.tab): Remove. All uses removed.
* Theory: Omit discussion of time.tab.
* zone-time.awk: Remove.
* tzselect.8: Omit -t and time.tab.
* tzselect.ksh (ZONETABTYPE): Remove. All uses removed.
Remove -t ZONETABTYPE option.
* zone.tab: Restore first comment line, since there's no longer
a need to distinguish this file from time.tab.
* Makefile (ZFLAGS): Add a comment about how to enable meta-info.
* tzfile.5: Describe meta-information.
* zic.8: Document new options -n and -o, which cause zic to
generate meta-info.
* zic.c: Include <stddef.h>, for ptrdiff_t.
(genoption, genoptions, genname): New static vars.
(usage): Summarize new options.
(addgenoption, writevalue): New function.
(main, writezone): Add support for new options.
In several places the code and documentation incorrectly used
"UTC" to describe time stamps that might precede the introduction
of UTC and for which UTC is therefore undefined. Change these
uses to "UT", as that's the correct term when talking about these
time stamps. Problem reported by Steve Allen in
<http://mm.icann.org/pipermail/tz/2013-September/019907.html>.
The major compatibility issue here is with 'zdump -v'; it'll now
output "UT" instead of the possibly-incorrect "UTC".
Many files change in minor ways in the commentary.
* zdump.c (show):
* zic.c (inzsub, addtype):
In output, say "UT" rather than "UTC", since the time stamp we're
talking about might precede the introduction of UTC.
Other tz file readers had problems with the new pre1970 file, so
remove it and related changes. To recover the pre-1970 data,
instead change pre-1970 Zone entries in other files back to what
they were. Perhaps we'll try to find a better way someday.
* .gitignore: Remove back-pre1970.
* Makefile (BACKWARD): Remove. All uses changed back to 'backward'.
(AWK_SCRIPTS): Remove back-pre1970.awk.
(back-pre1970): Remove.
(clean_misc): Don't rm back-pre1970.
(check_public): Remove special case for pre1970.
* back-pre1970.awk, pre1970: Remove.
* backward (America/Anguilla, America/Antigua, America/Aruba)
(America/Atikokan, America/Blanc-Sablon, America/Cayman)
(America/Creston, America/Curacao, America/Dominica, America/Grenada)
(America/Guadeloupe, America/Montreal, America/Montserrat)
(America/Nassau, America/Port_of_Spain, America/St_Kitts)
(America/St_Lucia, America/St_Thomas, America/St_Vincent)
(America/Tortola): Remove, as these are zones again.
(America/Coral_Harbour, America/Kralendijk, America/Lower_Princes)
(America/Marigot, America/St_Barthelemy, America/Virgin):
Revert to previous links.
* northamerica (Mont, America/Blanc-Sablon, America/Montreal)
(America/Atikokan, America/Creston, America/Anguilla, America/Antigua)
(Bahamas, America/Nassau, America/Cayman, America/Dominica)
(America/Grenada, America/Guadeloupe, America/Montserrat)
(America/St_Kitts, America/St_Lucia, America/St_Vincent)
(America/Tortola, America/St_Thomas):
* southamerica (America/Aruba, America/Curacao, America/Port_of_Spain):
Restore these rules and zones.
* .gitignore: Add back-pre1970.
This lets us preserve information about pre-1970 time stamps when
we change a Zone to a Link to another zone whose time stamps agree
after 1970. This should address concerns about some recent
changes that removed this information. This implementation is a
stripped-down version of a suggestion by Andrew Main (Zefram) in
<http://mm.icann.org/pipermail/tz/2013-August/019615.html> and
<http://mm.icann.org/pipermail/tz/2013-August/019639.html> to
allow filtering tz data by date range. Unlike Zefram's
suggestion, this implementation supports only two date ranges,
namely 1970 on, using 'make BACKWARD=backward'; and all dates,
using 'make BACKWARD="pre1970 back-pre1970"'. At some point I'd
like to improve it to support arbitrary date ranges, but at least
we've now restored the data whose loss was of some concern.
* .gitignore: Add back-pre1970.
* Makefile (BACKWARD): New macro.
(YDATA): Use it instead of 'backward'.
(AWK_SCRIPTS): New macro, with additional script back-pre1970.awk.
(MISC): Use it.
(back-pre1970): New rule.
(clean_misc): Clean back-pre1970. Also clean time.tab, while we're
at it.
(check_public): Don't require pre1970 to stand alone.
* pre1970, back-pre1970.awk: New files.
This is a backwards-compatible way of transitioning to a less
politically-charged approach to choosing TZ values. A new time
zone table time.tab acts like zone.tab, except it omits TZ values
that are present only for political reasons. tzselect has a new
"-t zonetabtype" option that lets users select which time zone table
to use, and installers can select the default table. The zone.tab
file does not change, and the default tzselect table for now is
zone.tab. This avoids the backward-compatibility concerns
expressed on the tz mailing list; see, for example,
the discussion surrounding Derick Rethans's comments in
<http://mm.icann.org/pipermail/tz/2013-August/019544.html>
* .gitignore: Add time.tab.
* Makefile (ZONETABTYPE): New macro.
(TABDATA): Add time.tab.
(all): Depend on $(TABDATA).
(install): Do not depend on $(TABDATA), since $(DATA) includes it.
Install time.tab too.
(time.tab): New rule.
(tzselect.tab): Substitute ZONETABTYPE.
* zone-time.awk: New file.
* tzselect.8: Document new options, and --help and --version while
we're at it.
* tzselect.ksh (ZONETABTYPE): New var.
Implement -t ZONETABTYPE option.
Check that no extra operands are given.
* zone.tab: Change first comment line, to distinguish the two
tables better.
* Makefile (TZDIR_BASENAME): New macro.
(TZDIR): Use it.
(other_two): Remove.
(right_posix, posix_right): Use a symbolic link if supported.
This saves about 2 megabytes' worth of installed files.
I audited the code and fixed as many width-asssumptions as I could
find, including several places where the code assumed that 'time_t'
was no wider than 'long'; this assumption is not true on 32-bit
NetBSD platforms. This caught every problem that is already fixed
in the NetBSD zic.c, and caught quite a few more.
* Makefile: Add comments re HAVE_DOS_FILE_NAMES and HAVE_INTTYPES_H.
* date.c (checkfinal, netsettime): Don't use 'long' where 'int' will do.
* difftime.c (difftime): Mark with ATTRIBUTE_CONST.
Use uintmax_t, not unsigned long, for the widest unsigned integer type.
Use long double, not double, if time_t is wider than uintmax_t;
this can in theory help on nonstandard platforms, such as GCC
with 64-bit uintmax_t and 128-bit __int128_t.
* localtime.c (struct ttinfo.tt_gmtoff, struct rule.r_time)
(detzcode, getsecs, getoffset, gmtsub, localsub, increment_overflow32)
(normalize_overflow32, time1, time2, timesub, transtime, tzparse)
(time2sub, timeoff, gtime):
* tzfile.h (SECSPERDAY):
* zdump.c (SECSPERDAY):
* zic.c (convert, puttzcode):
Use int_fast32_t, not long, when all we care is that values up to
2**31 can be stored. This doesn't fix any bugs, but it allows
more opportunity for compiler optimization.
(struct lsinfo.ls_corr, timesub, leapcorr):
Use int_fast64_t, not long, when values up to 2**63 can be stored.
(timesub): Make it clearer when we are truncating 0.5 to 0.
(increment_overflow32): Rename from long_increment_overflow.
All uses changed.
(normalize_overflow32): Rename from long_normalize_overflow.
All uses changed.
* private.h (HAVE_INTTYPES_H, ATTRIBUTE_CONST): New macros.
Include <inttypes.h> if HAVE_INTTYPES_H.
(INT_FAST64_MIN, INT_FAST64_MAX, SCNdFAST64, int_fast32_t, PRIdMAX)
(uintmax_t, PRIuMAX, _Noreturn):
Define to reasonable values if it's an older compiler.
* scheck.c (scheck): Add support for arbitrary formats, such as
those that SCNdFAST64 can expand to, at the price of no longer
supporting weird conversion specs like "%[%]".
* strftime.c (_fmt): Use intmax_t and uintmax_t to format time_t,
not long and unsigned long.
* zdump.c (int_fast32_t, intmax_t, PRIdMAX, SCNdMAX):
Define for pre-C99 compilers, like private.h does.
(delta, yeartot, main): Use intmax_t, not long.
(hunt): Use time_t, not long, since the diff must be nonnegative.
(tformat): Allow for time_t wider than long.
* zic.c (ZIC_MIN, ZIC_MAX, SCNdZIC): New macros.
(OFFSET_STRLEN_MAXIMUM, RULE_STRLEN_MAXIMUM): Remove.
(struct rule): Make r_loyear, r_hiyear, r_tod, r_stdoff, z_gmtoff,
z_stdoff zic_t, not long.
(addtype, gethms, oadd, rpytime, tadd, gmtoffs, corr, inleap)
(stringoffset, stringrule, outzone, addtype, adjleap, rpytime)
(LDAYSPERWEEK):
Use zic_t, not long.
(leapminyear, leapmaxyear, min_year, max_year, rulesub, updateminmax)
(outzone, rpytime):
Use zic_t, not int.
(usage): Now _Noreturn.
(main): Use S_IWGRP, not 'unix', to determine whether to call umask.
(writezone): Omit unnecessary cast.
(mkdirs): Use HAVE_DOS_FILE_NAMES, not 'unix', to determine
whether to parse DOS file anmes.
(eitol): Remove; no longer needed.
* Makefile (TIME_T_ALTERNATIVES): New macro.
(check_time_t_alternatives, clean_misc): New rules.
(clean): Split out into clean_misc and removing tzpublic.
(public): Add check_time_t.
This makes it easier to test on (say) Debian, even if we're
testing the time_t type on (say) NetBSD. NetBSD uses 64-bit
time_t on 32-bit hosts, and this lets us test a NetBSD-style
implementation (32-bit 'long', 64-bit time_t) on a 32-bit Debian host.
* Makefile: Update comments to talk about TIME_T_FLOATING and time_tz.
Sort the comments.
* private.h (restrict): Define to empty with older compilers.
'restrict' is now needed, to define gmtime_r and localtime_r in
standard ways when time_tz is defined.
Make the following changes if time_tz is defined:
(sys_time, time): New static functions. The former is the system
'time' function that applies to the system time_t, the latter
our function that applies to our time_t.
(time_t, ctime, ctime_r, difftime, gmtime, gmtime_r, localtime)
(localtime_r, mktime): Rename to tz_time_t, tz_ctime, etc.,
via macros. Declare the renamed versions.
* zdump.8: Document new options -V, -t.
* zdump.c: Include private.h if time_tz is defined.
(INITIALIZE): Remove; no longer needed.
(absolute_min_time, absolute_max_time): Work even if time_t
is wider than intmax_t, which can be true with GCC and __int128_t.
Use the new TIME_T_FLOATING macro for this.
(usage): Document new flags.
(main): Support them.
Based on a patch by Joseph S. Myers in
<http://mm.icann.org/pipermail/tz/2012-November/018452.html>.
* Makefile (BUGEMAIL): New macro.
(version.h, tzselect): Use it to define REPORT_BUGS_TO.
* tzselect.ksh (REPORT_BUGS_TO): New variable, used for --help.
* zdump.c, zic.c (usage): Use REPORT_BUGS_TO for --help.
E.g., "zic (tzcode) 2012i" instead of "tzcode2012i".
Thread started by Joseph S. Myers in
<http://mm.icann.org/pipermail/tz/2012-November/018439.html>.
* Makefile (PACKAGE): New macro.
(version.h, tzselect): New constant PKGVERSION, derived from PACKAGE.
(tzselect): TZVERSION is now simply VERSION, since PACKAGE is also
output.
* tzselect.ksh (PKGVERSION): New var, which Makefile substitutes for.
(--usage, --version): Exit with nonzero status if we can't
output the help or version number.
* tzselect.ksh (--version):
* zdump.c, zic.c (main):
Output versions like this: "zdump (tzcode) 2012i".
