[Bug 2096974] Re: tzdata-2024b-0ubuntu0.24.04 makes std::chrono unusable

[Benjamin Drung]

It looks like the upstream commit
https://github.com/eggert/tz/commit/94e6b3b0eb773e66a9ac49b905c69c0fa6a31dc3
is the reason for it.

As workaround switch from the main format to the rearguard format until
std::chrono is fixed. The NEWS file says:

    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.

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https://bugs.launchpad.net/bugs/2096974

Title:
  tzdata-2024b-0ubuntu0.24.04 makes std::chrono unusable

Status in gcc-14 package in Ubuntu:
  Confirmed
Status in tzdata package in Ubuntu:
  Triaged
Status in waybar package in Ubuntu:
  New
Status in gcc-14 source package in Noble:
  New
Status in tzdata source package in Noble:
  New
Status in waybar source package in Noble:
  New
Status in gcc-14 source package in Oracular:
  New
Status in tzdata source package in Oracular:
  New
Status in waybar source package in Oracular:
  New

Bug 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

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