[Bug 1904439] [NEW] python3.9+ should be compiled with --with-tzpath option

[Paul G]

Public bug reported:

PEP 615 added a compile-time option for specifying the location of time
zone data, with a primary use case being that it would allow distros to
specify where the system-deployed zoneinfo files are.

See https://www.python.org/dev/peps/pep-0615/#compile-time-options and
https://docs.python.org/3/library/zoneinfo.html#zoneinfo-data-compile-
time-config

Since debian's tzdata is always deployed to /usr/share/zoneinfo, it
would be a good idea to compile with --with-tzpath=/usr/share/zoneinfo,
so that the default zoneinfo.TZPATH (i.e. the value when the time zone
search path is not modified by an environment variable or
zoneinfo.reset_tzpath) is ('/usr/share/zoneinfo',) rather than:

('/usr/share/zoneinfo',
'/usr/lib/zoneinfo',
'/usr/share/lib/zoneinfo',
'/etc/zoneinfo')

This will mostly make failed lookups faster, and possibly avoid some
bugs that would be hit by users who have some old non-system time zones
distributed to one of the other locations.

** Affects: python3.9 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1904439

Title:
  python3.9+ should be compiled with --with-tzpath option

Status in python3.9 package in Ubuntu:
  New

Bug description:
  PEP 615 added a compile-time option for specifying the location of
  time zone data, with a primary use case being that it would allow
  distros to specify where the system-deployed zoneinfo files are.

  See https://www.python.org/dev/peps/pep-0615/#compile-time-options and
  https://docs.python.org/3/library/zoneinfo.html#zoneinfo-data-compile-
  time-config

  Since debian's tzdata is always deployed to /usr/share/zoneinfo, it
  would be a good idea to compile with --with-
  tzpath=/usr/share/zoneinfo, so that the default zoneinfo.TZPATH (i.e.
  the value when the time zone search path is not modified by an
  environment variable or zoneinfo.reset_tzpath) is
  ('/usr/share/zoneinfo',) rather than:

  ('/usr/share/zoneinfo',
  '/usr/lib/zoneinfo',
  '/usr/share/lib/zoneinfo',
  '/etc/zoneinfo')

  This will mostly make failed lookups faster, and possibly avoid some
  bugs that would be hit by users who have some old non-system time
  zones distributed to one of the other locations.

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