Patch is fine however I would suggest to remove the hunk changing
changellog files it will make it easy to backport
On Thu, Nov 21, 2024 at 5:30 PM Markus Volk via lists.openembedded.org
<f_l_k=t-online...@lists.openembedded.org> wrote:
> There is an issue in the std::chrono::tzdb parser that causes problems
> since the tzdata-2024b release started using %z in the main format.
>
> As a real world problem I encounter an issue with the waybar clock module,
> which ignores the timezone setting and only shows system time.
>
> Signed-off-by: Markus Volk <f_...@t-online.de>
> ---
> meta/recipes-devtools/gcc/gcc-14.2.inc | 1 +
> ...4fffe3fc82a710bea66ad651720d71c938b8.patch | 567 ++++++++++++++++++
> 2 files changed, 568 insertions(+)
> create mode 100644
> meta/recipes-devtools/gcc/gcc/gcc.git-ab884fffe3fc82a710bea66ad651720d71c938b8.patch
>
> diff --git a/meta/recipes-devtools/gcc/gcc-14.2.inc
> b/meta/recipes-devtools/gcc/gcc-14.2.inc
> index f05484cfc0..9cfb246294 100644
> --- a/meta/recipes-devtools/gcc/gcc-14.2.inc
> +++ b/meta/recipes-devtools/gcc/gcc-14.2.inc
> @@ -68,6 +68,7 @@ SRC_URI = "${BASEURI} \
> file://0023-Fix-install-path-of-linux64.h.patch \
> file://0024-Avoid-hardcoded-build-paths-into-ppc-libgcc.patch \
> file://0025-gcc-testsuite-tweaks-for-mips-OE.patch \
> + file://gcc.git-ab884fffe3fc82a710bea66ad651720d71c938b8.patch \
> "
>
> S = "${TMPDIR}/work-shared/gcc-${PV}-${PR}/${SOURCEDIR}"
> diff --git
> a/meta/recipes-devtools/gcc/gcc/gcc.git-ab884fffe3fc82a710bea66ad651720d71c938b8.patch
> b/meta/recipes-devtools/gcc/gcc/gcc.git-ab884fffe3fc82a710bea66ad651720d71c938b8.patch
> new file mode 100644
> index 0000000000..ca6fc92e07
> --- /dev/null
> +++
> b/meta/recipes-devtools/gcc/gcc/gcc.git-ab884fffe3fc82a710bea66ad651720d71c938b8.patch
> @@ -0,0 +1,567 @@
> +From ab884fffe3fc82a710bea66ad651720d71c938b8 Mon Sep 17 00:00:00 2001
> +From: Jonathan Wakely <jwak...@redhat.com>
> +Date: Tue, 30 Apr 2024 09:52:13 +0100
> +Subject: [PATCH] libstdc++: Fix std::chrono::tzdb to work with vanguard
> format
> +
> +I found some issues in the std::chrono::tzdb parser by testing the
> +tzdata "vanguard" format, which uses new features that aren't enabled in
> +the "main" and "rearguard" data formats.
> +
> +Since 2024a the keyword "minimum" is no longer valid for the FROM and TO
> +fields in a Rule line, which means that "m" is now a valid abbreviation
> +for "maximum". Previously we expected either "mi" or "ma". For backwards
> +compatibility, a FROM field beginning with "mi" is still supported and
> +is treated as 1900. The "maximum" keyword is only allowed in TO now,
> +because it makes no sense in FROM. To support these changes the
> +minmax_year and minmax_year2 classes for parsing FROM and TO are
> +replaced with a single years_from_to class that reads both fields.
> +
> +The vanguard format makes use of %z in Zone FORMAT fields, which caused
> +an exception to be thrown from ZoneInfo::set_abbrev because no % or /
> +characters were expected when a Zone doesn't use a named Rule. The
> +ZoneInfo::to(sys_info&) function now uses format_abbrev_str to replace
> +any %z with the current offset. Although format_abbrev_str also checks
> +for %s and STD/DST formats, those only make sense when a named Rule is
> +in effect, so won't occur when ZoneInfo::to(sys_info&) is used.
> +
> +Since making this change on trunk, the tzdata-2024b release started
> +using %z in the main format, not just vanguard. This makes a backport to
> +release branches necessary (see PR 116657).
> +
> +This change also implements a feature that has always been missing from
> +time_zone::_M_get_sys_info: finding the Rule that is active before the
> +specified time point, so that we can correctly handle %s in the FORMAT
> +for the first new sys_info that gets created. This requires implementing
> +a poorly documented feature of zic, to get the LETTERS field from a
> +later transition, as described at
> +https://mm.icann.org/pipermail/tz/2024-April/058891.html
> +In order for this to work we need to be able to distinguish an empty
> +letters field (as used by CE%sT where the variable part is either empty
> +or "S") from "the letters field is not known for this transition". The
> +tzdata file uses "-" for an empty letters field, which libstdc++ was
> +previously replacing with "" when the Rule was parsed. Instead, we now
> +preserve the "-" in the Rule object, so that "" can be used for the case
> +where we don't know the letters (and so need to decide it).
> +
> +libstdc++-v3/ChangeLog:
> +
> + * src/c++20/tzdb.cc (minmax_year, minmax_year2): Remove.
> + (years_from_to): New class replacing minmax_year and
> + minmax_year2.
> + (format_abbrev_str, select_std_or_dst_abbrev): Move earlier in
> + the file. Handle "-" for letters.
> + (ZoneInfo::to): Use format_abbrev_str to expand %z.
> + (ZoneInfo::set_abbrev): Remove exception. Change parameter from
> + reference to value.
> + (operator>>(istream&, Rule&)): Do not clear letters when it
> + contains "-".
> + (time_zone::_M_get_sys_info): Add missing logic to find the Rule
> + in effect before the time point.
> + * testsuite/std/time/tzdb/1.cc: Adjust for vanguard format using
> + "GMT" as the Zone name, not as a Link to "Etc/GMT".
> + * testsuite/std/time/time_zone/sys_info_abbrev.cc: New test.
> +
> +(cherry picked from commit 0ca8d56f2085715f27ee536c6c344bc47af49cdd)
> +
> +Upstream-Status: Backport [
> https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=5ceea2ac106d6dd1aa8175670b15a801316cf1c9
> ]
> +
> +Signed-off-by: Markus Volk <f_...@t-online.de>
> +---
> + libstdc++-v3/src/c++20/tzdb.cc | 265 +++++++++++-------
> + .../std/time/time_zone/sys_info_abbrev.cc | 106 +++++++
> + libstdc++-v3/testsuite/std/time/tzdb/1.cc | 6 +-
> + 3 files changed, 274 insertions(+), 103 deletions(-)
> + create mode 100644
> libstdc++-v3/testsuite/std/time/time_zone/sys_info_abbrev.cc
> +
> +diff --git a/libstdc++-v3/src/c++20/tzdb.cc
> b/libstdc++-v3/src/c++20/tzdb.cc
> +index c7c7cc9deee6..7e8cce7ce8cf 100644
> +--- a/libstdc++-v3/src/c++20/tzdb.cc
> ++++ b/libstdc++-v3/src/c++20/tzdb.cc
> +@@ -342,51 +342,103 @@ namespace std::chrono
> + friend istream& operator>>(istream&, on_day&);
> + };
> +
> +- // Wrapper for chrono::year that reads a year, or one of the keywords
> +- // "minimum" or "maximum", or an unambiguous prefix of a keyword.
> +- struct minmax_year
> ++ // Wrapper for two chrono::year values, which reads the FROM and TO
> ++ // fields of a Rule line. The FROM field is a year and TO is a year
> or
> ++ // one of the keywords "maximum" or "only" (or an abbreviation of
> those).
> ++ // For backwards compatibility, the keyword "minimum" is recognized
> ++ // for FROM and interpreted as 1900.
> ++ struct years_from_to
> + {
> +- year& y;
> ++ year& from;
> ++ year& to;
> +
> +- friend istream& operator>>(istream& in, minmax_year&& y)
> ++ friend istream& operator>>(istream& in, years_from_to&& yy)
> + {
> +- if (ws(in).peek() == 'm') // keywords "minimum" or "maximum"
> ++ string s;
> ++ auto c = ws(in).peek();
> ++ if (c == 'm') [[unlikely]] // keyword "minimum"
> + {
> +- string s;
> +- in >> s; // extract the rest of the word, but only look at s[1]
> +- if (s[1] == 'a')
> +- y.y = year::max();
> +- else if (s[1] == 'i')
> +- y.y = year::min();
> +- else
> +- in.setstate(ios::failbit);
> ++ in >> s; // extract the rest of the word
> ++ yy.from = year(1900);
> ++ }
> ++ else if (int num = 0; in >> num) [[likely]]
> ++ yy.from = year{num};
> ++
> ++ c = ws(in).peek();
> ++ if (c == 'm') // keyword "maximum"
> ++ {
> ++ in >> s; // extract the rest of the word
> ++ yy.to = year::max();
> ++ }
> ++ else if (c == 'o') // keyword "only"
> ++ {
> ++ in >> s; // extract the rest of the word
> ++ yy.to = yy.from;
> + }
> + else if (int num = 0; in >> num)
> +- y.y = year{num};
> ++ yy.to = year{num};
> ++
> + return in;
> + }
> + };
> +
> +- // As above for minmax_year, but also supports the keyword "only",
> +- // meaning that the TO year is the same as the FROM year.
> +- struct minmax_year2
> ++ bool
> ++ select_std_or_dst_abbrev(string& abbrev, minutes save)
> + {
> +- minmax_year to;
> +- year from;
> ++ if (size_t pos = abbrev.find('/'); pos != string::npos)
> ++ {
> ++ // Select one of "STD/DST" for standard or daylight.
> ++ if (save == 0min)
> ++ abbrev.erase(pos);
> ++ else
> ++ abbrev.erase(0, pos + 1);
> ++ return true;
> ++ }
> ++ return false;
> ++ }
> +
> +- friend istream& operator>>(istream& in, minmax_year2&& y)
> +- {
> +- if (ws(in).peek() == 'o') // keyword "only"
> +- {
> +- string s;
> +- in >> s; // extract the whole keyword
> +- y.to.y = y.from;
> +- }
> +- else
> +- in >> std::move(y.to);
> +- return in;
> +- }
> +- };
> ++ // Set the sys_info::abbrev string by expanding any placeholders.
> ++ void
> ++ format_abbrev_str(sys_info& info, string_view letters = {})
> ++ {
> ++ if (size_t pos = info.abbrev.find('%'); pos != string::npos)
> ++ {
> ++ if (info.abbrev[pos + 1] == 's')
> ++ {
> ++ // Expand "%s" to the variable part, given by Rule::letters.
> ++ if (letters == "-")
> ++ info.abbrev.erase(pos, 2);
> ++ else
> ++ info.abbrev.replace(pos, 2, letters);
> ++ }
> ++ else if (info.abbrev[pos + 1] == 'z')
> ++ {
> ++ // Expand "%z" to the UT offset as +/-hh, +/-hhmm, or
> +/-hhmmss.
> ++ hh_mm_ss<seconds> t(info.offset);
> ++ string z(1, "+-"[t.is_negative()]);
> ++ long val = t.hours().count();
> ++ int digits = 2;
> ++ if (int m = t.minutes().count())
> ++ {
> ++ digits = 4;
> ++ val *= 100;
> ++ val += m;
> ++ if (int s = t.seconds().count())
> ++ {
> ++ digits = 6;
> ++ val *= 100;
> ++ val += s;
> ++ }
> ++ }
> ++ auto sval = std::to_string(val);
> ++ z += string(digits - sval.size(), '0');
> ++ z += sval;
> ++ info.abbrev.replace(pos, 2, z);
> ++ }
> ++ }
> ++ else
> ++ select_std_or_dst_abbrev(info.abbrev, info.save);
> ++ }
> +
> + // A time zone information record.
> + // Zone NAME STDOFF RULES FORMAT [UNTIL]
> +@@ -462,6 +514,7 @@ namespace std::chrono
> + info.offset = offset();
> + info.save = minutes(m_save);
> + info.abbrev = format();
> ++ format_abbrev_str(info); // expand %z
> + return true;
> + }
> +
> +@@ -469,12 +522,9 @@ namespace std::chrono
> + friend class time_zone;
> +
> + void
> +- set_abbrev(const string& abbrev)
> ++ set_abbrev(string abbrev)
> + {
> +- // In practice, the FORMAT field never needs expanding here.
> +- if (abbrev.find_first_of("/%") != abbrev.npos)
> +- __throw_runtime_error("std::chrono::time_zone: invalid data");
> +- m_buf = abbrev;
> ++ m_buf = std::move(abbrev);
> + m_pos = 0;
> + m_expanded = true;
> + }
> +@@ -544,9 +594,7 @@ namespace std::chrono
> +
> + // Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
> +
> +- in >> quoted(rule.name)
> +- >> minmax_year{rule.from}
> +- >> minmax_year2{rule.to, rule.from};
> ++ in >> quoted(rule.name) >> years_from_to{rule.from, rule.to};
> +
> + if (char type; in >> type && type != '-')
> + in.setstate(ios::failbit);
> +@@ -557,7 +605,7 @@ namespace std::chrono
> + if (save_time.indicator != at_time::Wall)
> + {
> + // We don't actually store the save_time.indicator, because we
> +- // assume that it's always deducable from the actual offset
> value.
> ++ // assume that it's always deducible from the offset value.
> + auto expected = save_time.time == 0s
> + ? at_time::Standard
> + : at_time::Daylight;
> +@@ -567,8 +615,6 @@ namespace std::chrono
> + rule.save = save_time.time;
> +
> + in >> rule.letters;
> +- if (rule.letters == "-")
> +- rule.letters.clear();
> + return in;
> + }
> +
> +@@ -719,58 +765,6 @@ namespace std::chrono
> + #endif // TZDB_DISABLED
> + };
> +
> +-#ifndef TZDB_DISABLED
> +- namespace
> +- {
> +- bool
> +- select_std_or_dst_abbrev(string& abbrev, minutes save)
> +- {
> +- if (size_t pos = abbrev.find('/'); pos != string::npos)
> +- {
> +- // Select one of "STD/DST" for standard or daylight.
> +- if (save == 0min)
> +- abbrev.erase(pos);
> +- else
> +- abbrev.erase(0, pos + 1);
> +- return true;
> +- }
> +- return false;
> +- }
> +-
> +- // Set the sys_info::abbrev string by expanding any placeholders.
> +- void
> +- format_abbrev_str(sys_info& info, string_view letters = {})
> +- {
> +- if (size_t pos = info.abbrev.find("%s"); pos != string::npos)
> +- {
> +- // Expand "%s" to the variable part, given by Rule::letters.
> +- info.abbrev.replace(pos, 2, letters);
> +- }
> +- else if (size_t pos = info.abbrev.find("%z"); pos != string::npos)
> +- {
> +- // Expand "%z" to the UT offset as +/-hh, +/-hhmm, or +/-hhmmss.
> +- hh_mm_ss<seconds> t(info.offset);
> +- string z(1, "+-"[t.is_negative()]);
> +- long val = t.hours().count();
> +- if (minutes m = t.minutes(); m != m.zero())
> +- {
> +- val *= 100;
> +- val += m.count();
> +- if (seconds s = t.seconds(); s != s.zero())
> +- {
> +- val *= 100;
> +- val += s.count();
> +- }
> +- }
> +- z += std::to_string(val);
> +- info.abbrev.replace(pos, 2, z);
> +- }
> +- else
> +- select_std_or_dst_abbrev(info.abbrev, info.save);
> +- }
> +- }
> +-#endif // TZDB_DISABLED
> +-
> + // Implementation of std::chrono::time_zone::get_info(const
> sys_time<D>&)
> + sys_info
> + time_zone::_M_get_sys_info(sys_seconds tp) const
> +@@ -839,12 +833,72 @@ namespace std::chrono
> + info.abbrev = ri.format();
> +
> + string_view letters;
> +- if (i != infos.begin())
> ++ if (i != infos.begin() && i[-1].expanded())
> ++ letters = i[-1].next_letters();
> ++
> ++ if (letters.empty())
> + {
> +- if (i[-1].expanded())
> +- letters = i[-1].next_letters();
> +- // XXX else need to find Rule active before this time and use it
> +- // to know the initial offset, save, and letters.
> ++ sys_seconds t = info.begin - seconds(1);
> ++ const year_month_day date(chrono::floor<days>(t));
> ++
> ++ // Try to find a Rule active before this time, to get initial
> ++ // SAVE and LETTERS values. There may not be a Rule for the period
> ++ // before the first DST transition, so find the earliest DST->STD
> ++ // transition and use the LETTERS from that.
> ++ const Rule* active_rule = nullptr;
> ++ sys_seconds active_rule_start = sys_seconds::min();
> ++ const Rule* first_std = nullptr;
> ++ for (const auto& rule : rules)
> ++ {
> ++ if (rule.save == minutes(0))
> ++ {
> ++ if (!first_std)
> ++ first_std = &rule;
> ++ else if (rule.from < first_std->from)
> ++ first_std = &rule;
> ++ else if (rule.from == first_std->from)
> ++ {
> ++ if (rule.start_time(rule.from, {})
> ++ < first_std->start_time(first_std->from, {}))
> ++ first_std = &rule;
> ++ }
> ++ }
> ++
> ++ year y = date.year();
> ++
> ++ if (y > rule.to) // rule no longer applies at time t
> ++ continue;
> ++ if (y < rule.from) // rule doesn't apply yet at time t
> ++ continue;
> ++
> ++ sys_seconds rule_start;
> ++
> ++ seconds offset{}; // appropriate for at_time::Universal
> ++ if (rule.when.indicator == at_time::Wall)
> ++ offset = info.offset;
> ++ else if (rule.when.indicator == at_time::Standard)
> ++ offset = ri.offset();
> ++
> ++ // Time the rule takes effect this year:
> ++ rule_start = rule.start_time(y, offset);
> ++
> ++ if (rule_start >= t && rule.from < y)
> ++ {
> ++ // Try this rule in the previous year.
> ++ rule_start = rule.start_time(--y, offset);
> ++ }
> ++
> ++ if (active_rule_start < rule_start && rule_start < t)
> ++ {
> ++ active_rule_start = rule_start;
> ++ active_rule = &rule;
> ++ }
> ++ }
> ++
> ++ if (active_rule)
> ++ letters = active_rule->letters;
> ++ else if (first_std)
> ++ letters = first_std->letters;
> + }
> +
> + const Rule* curr_rule = nullptr;
> +@@ -2069,9 +2123,11 @@ namespace std::chrono
> + istringstream in2(std::move(rules));
> + in2 >> rules_time;
> + inf.m_save = duration_cast<minutes>(rules_time.time);
> ++ // If the FORMAT is "STD/DST" then we can choose the right
> one
> ++ // now, so that we store a shorter string.
> + select_std_or_dst_abbrev(fmt, inf.m_save);
> + }
> +- inf.set_abbrev(fmt);
> ++ inf.set_abbrev(std::move(fmt));
> + }
> +
> + // YEAR [MONTH [DAY [TIME]]]
> +@@ -2082,7 +2138,12 @@ namespace std::chrono
> + abbrev_month m{January};
> + int d = 1;
> + at_time t{};
> ++ // XXX DAY should support ON format, e.g. lastSun or Sun>=8
> + in >> m >> d >> t;
> ++ // XXX UNTIL field should be interpreted
> ++ // "using the rules in effect just before the transition"
> ++ // so might need to store as year_month_day and hh_mm_ss and only
> ++ // convert to a sys_time once we know the offset in effect.
> + inf.m_until = sys_days(year(y)/m.m/day(d)) + seconds(t.time);
> + }
> + else
> +diff --git a/libstdc++-v3/testsuite/std/time/time_zone/sys_info_abbrev.cc
> b/libstdc++-v3/testsuite/std/time/time_zone/sys_info_abbrev.cc
> +new file mode 100644
> +index 000000000000..f1a8fff02f58
> +--- /dev/null
> ++++ b/libstdc++-v3/testsuite/std/time/time_zone/sys_info_abbrev.cc
> +@@ -0,0 +1,106 @@
> ++// { dg-do run { target c++20 } }
> ++// { dg-require-effective-target tzdb }
> ++// { dg-require-effective-target cxx11_abi }
> ++// { dg-xfail-run-if "no weak override on AIX" { powerpc-ibm-aix* } }
> ++
> ++#include <chrono>
> ++#include <fstream>
> ++#include <testsuite_hooks.h>
> ++
> ++static bool override_used = false;
> ++
> ++namespace __gnu_cxx
> ++{
> ++ const char* zoneinfo_dir_override() {
> ++ override_used = true;
> ++ return "./";
> ++ }
> ++}
> ++
> ++using namespace std::chrono;
> ++
> ++void
> ++test_format()
> ++{
> ++ std::ofstream("tzdata.zi") << R"(# version test_1
> ++Zone Africa/Bissau -1:2:20 - LMT 1912 Ja 1 1u
> ++ -1 - %z 1975
> ++ 0 - GMT
> ++Zon Some/Zone 1:2:3 - %z 1900
> ++ 1:23:45 - %z 1950
> ++Zo Another/Zone 1:2:3 - AZ0 1901
> ++ 1 Roolz A%sZ 2000
> ++ 1 Roolz SAZ/DAZ 2005
> ++ 1 Roolz %z
> ++Rule Roolz 1950 max - April 1 2 1 D
> ++Rul Roolz 1950 max - Oct 1 1 0 S
> ++Z Strange/Zone 1 - X%sX 1980
> ++ 1 - FOO/BAR 1990
> ++ 2:00 - %zzz 1995
> ++ 0:9 - %zzz 1996
> ++ 0:8:7 - %zzz 1997
> ++ 0:6:5.5 - %zzz 1998
> ++)";
> ++
> ++ const auto& db = reload_tzdb();
> ++ VERIFY( override_used ); // If this fails then XFAIL for the target.
> ++ VERIFY( db.version == "test_1" );
> ++
> ++ // Test formatting %z as
> ++ auto tz = locate_zone("Africa/Bissau");
> ++ auto inf = tz->get_info(sys_days(1974y/1/1));
> ++ VERIFY( inf.abbrev == "-01" );
> ++
> ++ tz = locate_zone("Some/Zone");
> ++ inf = tz->get_info(sys_days(1899y/1/1));
> ++ VERIFY( inf.abbrev == "+010203" );
> ++ inf = tz->get_info(sys_days(1955y/1/1));
> ++ VERIFY( inf.abbrev == "+012345" );
> ++
> ++ tz = locate_zone("Another/Zone");
> ++ // Test formatting %s as the LETTER/S field from the active Rule.
> ++ inf = tz->get_info(sys_days(1910y/January/1));
> ++ VERIFY( inf.abbrev == "ASZ" );
> ++ inf = tz->get_info(sys_days(1950y/January/1));
> ++ VERIFY( inf.abbrev == "ASZ" );
> ++ inf = tz->get_info(sys_days(1950y/June/1));
> ++ VERIFY( inf.abbrev == "ADZ" );
> ++ inf = tz->get_info(sys_days(1999y/January/1));
> ++ VERIFY( inf.abbrev == "ASZ" );
> ++ inf = tz->get_info(sys_days(1999y/July/1));
> ++ VERIFY( inf.abbrev == "ADZ" );
> ++ // Test formatting STD/DST according to the active Rule.
> ++ inf = tz->get_info(sys_days(2000y/January/2));
> ++ VERIFY( inf.abbrev == "SAZ" );
> ++ inf = tz->get_info(sys_days(2001y/January/1));
> ++ VERIFY( inf.abbrev == "SAZ" );
> ++ inf = tz->get_info(sys_days(2001y/July/1));
> ++ VERIFY( inf.abbrev == "DAZ" );
> ++ // Test formatting %z as the offset determined by the active Rule.
> ++ inf = tz->get_info(sys_days(2005y/January/2));
> ++ VERIFY( inf.abbrev == "+01" );
> ++ inf = tz->get_info(sys_days(2006y/January/1));
> ++ VERIFY( inf.abbrev == "+01" );
> ++ inf = tz->get_info(sys_days(2006y/July/1));
> ++ VERIFY( inf.abbrev == "+02" );
> ++
> ++ // Test formatting %z, %s and S/D for a Zone with no associated Rules.
> ++ tz = locate_zone("Strange/Zone");
> ++ inf = tz->get_info(sys_days(1979y/January/1));
> ++ VERIFY( inf.abbrev == "XX" ); // No Rule means nothing to use for %s.
> ++ inf = tz->get_info(sys_days(1981y/July/1));
> ++ VERIFY( inf.abbrev == "FOO" ); // Always standard time means first
> string.
> ++ inf = tz->get_info(sys_days(1994y/July/1));
> ++ VERIFY( inf.abbrev == "+02zz" );
> ++ inf = tz->get_info(sys_days(1995y/July/1));
> ++ VERIFY( inf.abbrev == "+0009zz" );
> ++ inf = tz->get_info(sys_days(1996y/July/1));
> ++ VERIFY( inf.abbrev == "+000807zz" );
> ++ inf = tz->get_info(sys_days(1997y/July/1));
> ++ VERIFY( inf.abbrev == "+000606zz" );
> ++}
> ++
> ++int main()
> ++{
> ++ test_format();
> ++}
> +diff --git a/libstdc++-v3/testsuite/std/time/tzdb/1.cc
> b/libstdc++-v3/testsuite/std/time/tzdb/1.cc
> +index 796f3a8b4256..7a31c1c20ba7 100644
> +--- a/libstdc++-v3/testsuite/std/time/tzdb/1.cc
> ++++ b/libstdc++-v3/testsuite/std/time/tzdb/1.cc
> +@@ -39,11 +39,15 @@ test_locate()
> + const tzdb& db = get_tzdb();
> + const time_zone* tz = db.locate_zone("GMT");
> + VERIFY( tz != nullptr );
> +- VERIFY( tz->name() == "Etc/GMT" );
> + VERIFY( tz == std::chrono::locate_zone("GMT") );
> + VERIFY( tz == db.locate_zone("Etc/GMT") );
> + VERIFY( tz == db.locate_zone("Etc/GMT+0") );
> +
> ++ // Since 2022f GMT is now a Zone and Etc/GMT a link instead of vice
> versa,
> ++ // but only when using the vanguard format. As of 2024a, the main and
> ++ // rearguard formats still have Etc/GMT as a Zone and GMT as a link.
> ++ VERIFY( tz->name() == "GMT" || tz->name() == "Etc/GMT" );
> ++
> + VERIFY( db.locate_zone(db.current_zone()->name()) == db.current_zone()
> );
> + }
> +
> +--
> +2.43.5
> +
> --
> 2.47.0
>
>
>
>
>
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