[Bug 2062522] Re: std::chrono::locate_zone("Asia/Chungking") fails

[Steve Langasek]

Hello Matthias, or anyone else affected,

Accepted tzdata into noble-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/tzdata/2024a-3ubuntu1
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
noble to verification-done-noble. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-noble. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: tzdata (Ubuntu Noble)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-noble

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https://bugs.launchpad.net/bugs/2062522

Title:
   std::chrono::locate_zone("Asia/Chungking") fails

Status in glibc package in Ubuntu:
  New
Status in tzdata package in Ubuntu:
  Fix Committed
Status in tzdata source package in Noble:
  Fix Committed

Bug description:
  forwarded from
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114770

  ```
  #include <chrono>
  int main()
  {
    (void) std::chrono::locate_zone("Asia/Chungking");
  }
  ```

  With the latest tzdata (version 2024a-2) on Debian Sid this fails:

  terminate called after throwing an instance of 'std::runtime_error'
    what():  tzdb: cannot locate zone: Asia/Chungking
  Aborted (core dumped)

  The problem is a Debian patch that enables link chaining, so that one link can have another link as its target:
  https://sources.debian.org/patches/tzdata/2024a-2/ziguard.awk-Move-link-to-link-feature-from-vanguard-to-ma.patch/

  This feature was added to tzdata in 2022, but isn't compatible with
  the expectations of the C++20 standard. When chrono::locate_zone finds
  a link, it expects its target to be a zone, not another link.

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