** Description changed: [ Impact ] The latest tzdata SRU[1] included a change[2] in the main data form: - The main source files' time zone abbreviations now use %z, - supported by zic since release 2015f and used in vanguard form - since release 2022b. For example, America/Sao_Paulo now contains - the zone continuation line "-3:00 Brazil %z", which is less error - prone than the old "-3:00 Brazil -03/-02". This does not change - the represented data: the generated TZif files are unchanged. - Rearguard form still avoids %z, to support obsolescent parsers. + The main source files' time zone abbreviations now use %z, + supported by zic since release 2015f and used in vanguard form + since release 2022b. For example, America/Sao_Paulo now contains + the zone continuation line "-3:00 Brazil %z", which is less error + prone than the old "-3:00 Brazil -03/-02". This does not change + the represented data: the generated TZif files are unchanged. + Rearguard form still avoids %z, to support obsolescent parsers. - - Turns out the standard c++ library in at least oracular and noble fail to parse that, resulting in a much small list of available timezones, or even crashes[3]. + Turns out the standard c++ library in at least oracular and noble fail + to parse that, resulting in a much small list of available timezones, or + even crashes[3]. The c++ fix for that is in [4]. That might be eventually SRUed, but at the moment it's quicker to adjust tzdata than the c++ library. Also, there might be other parsers in the supported Ubuntu releases that are also affected, and just haven't been noticed yet. - 1. https://launchpad.net/bugs/2070285 2. https://github.com/eggert/tz/commit/94e6b3b0eb773e66a9ac49b905c69c0fa6a31dc3 3. https://bugs.launchpad.net/ubuntu/+source/tzdata/+bug/2096974/comments/10 4. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116657 - [ Test Plan ] This update includes a new DEP8 test that checks specifically for this bug. Therefore, the test plan is to observe that the full suite of autopkgtests is run and that it passed. Manual testing specifically for this bug is also accepted, with the C++ example provided: """ inalling tzdata in version 2024b-0ubuntu0.24.04 causes std::chrono to deliver only 2 timezones: code: for (const auto & time_zone : std::chrono::get_tzdb().zones) { std::cout << time_zone.name() << std::endl; } output: Etc/GMT Etc/UTC """ The output should include all timezones. [ Where problems could occur ] - TBD + All software that use tzdata could be affected by this update. There is + probably at least one implementation in each programming language for + reading the timezone data. The update could trigger parser bugs. - [ Other Info ] - - TBD + The autopkgtest will cover Python's zoneinfo and now C++ std::chrono. [ Original Description ] inalling tzdata in version 2024b-0ubuntu0.24.04 causes std::chrono to deliver only 2 timezones: code: for (const auto & time_zone : std::chrono::get_tzdb().zones) { std::cout << time_zone.name() << std::endl; } output: Etc/GMT Etc/UTC
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2096974 Title: tzdata-2024b-0ubuntu0.24.04 makes std::chrono unusable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-14/+bug/2096974/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
