From patchwork Fri Nov 22 01:29:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Volk X-Patchwork-Id: 52947 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id EFFEAE65D12 for ; Fri, 22 Nov 2024 01:30:12 +0000 (UTC) Received: from mailout06.t-online.de (mailout06.t-online.de [194.25.134.19]) by mx.groups.io with SMTP id smtpd.web10.14743.1732239003871067341 for ; Thu, 21 Nov 2024 17:30:04 -0800 Authentication-Results: mx.groups.io; dkim=none (message not signed); spf=pass (domain: t-online.de, ip: 194.25.134.19, mailfrom: f_l_k@t-online.de) Received: from fwd76.aul.t-online.de (fwd76.aul.t-online.de [10.223.144.102]) by mailout06.t-online.de (Postfix) with SMTP id 07B599A6 for ; Fri, 22 Nov 2024 02:30:00 +0100 (CET) Received: from intel-corei7-64.fritz.box ([84.163.36.225]) by fwd76.t-online.de with (TLSv1.3:TLS_AES_256_GCM_SHA384 encrypted) esmtp id 1tEIUh-3GqJmL0; Fri, 22 Nov 2024 02:29:59 +0100 From: Markus Volk To: openembedded-core@lists.openembedded.org Subject: [oe-core][PATCH] gcc: add a backport patch to fix an issue with tzdata 2024b Date: Fri, 22 Nov 2024 02:29:41 +0100 Message-ID: <20241122012941.3055-1-f_l_k@t-online.de> X-Mailer: git-send-email 2.47.0 MIME-Version: 1.0 X-TOI-EXPURGATEID: 150726::1732238999-45FEA90D-F64E3BD7/0/0 CLEAN NORMAL X-TOI-MSGID: 7e4fd6b2-b686-4237-aab5-0b8f7f55648c List-Id: X-Webhook-Received: from li982-79.members.linode.com [45.33.32.79] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Fri, 22 Nov 2024 01:30:12 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/207584 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 --- 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 +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 +--- + 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 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 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&) + 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(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(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 ++#include ++#include ++ ++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 +