https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109857
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #4) > This would be bad in the Debian case, because they backport changes to the > DST rules from the upstream IANA database, but for Debian stable don't > change the "version" string in tzdata.zi. This means libstdc++ will always > think the system tzdata.zi version "2021a" is older than the bundled > "2023c", even though the system file might actually have newer rules > backported from upstream. If we automatically used the bundled 2023c data we > would actually be using older data. Another consequence of the Debian stable policy is that a long-running C++ process will think it always has the latest tzdb, even if the on-disk tzdata.zi has actually been updated by apt-get. i.e. std::chrono::reload_tzdb() will never do anything. Maybe I should report this as a bug to Debian, and ask them to append some discriminator to the version string, like "2021a.1", "2021a.2" etc.
