[tz] Extra transition for Europe/London with 2023d

[brian.inglis at systematicsw.ab.ca]

On 2024-01-04 11:07, Bradley White via tz wrote:
> On Thu, Jan 4, 2024 at 12:23 PM Matthew Donadio via tz <tz at iana.org 
> <mailto:tz at iana.org>> wrote:
> 
>     On Thu, Jan 4, 2024 at 6:00 AM Derick Rethans via tz <tz at iana.org
>     <mailto:tz at iana.org>> wrote:
> 
>         This is the repro set-up, no non-default arguments, or any of the
>         environment variables. I use the 2023.4 data file, and the 2023c/2023d code
>         releases.
> 
> 
>     I can do a `git bisect` in the next day or three (prob over the weekend) if
>     that will help narrow down where this was introduced. Should be pretty easy
>     to adjust Derick's script to automate most of it.
> 
> 
> It was ...
> 
> commit 35c116b7536a36c43eb7cd36bff71ad0c5ecf071
> Author: Paul Eggert <eggert at cs.ucla.edu <mailto:eggert at cs.ucla.edu>>
> Date:   Sun Oct 15 12:26:28 2023 -0700
> 
>      Fix zic bug with Palestine after 2075
> 
>      The bug can be observed when processing the following .zi data,
>      adapted from the current ‘asia’ file:
>              Rule Palestine 2075 max  - Mar Sat<=30 2:00 1:00 S
>              Rule Palestine 2075 max  - Oct Sat<=30 2:00    0 -
>              Rule Palestine 2076 only - Jul      25 2:00    0 -
>              Rule Palestine 2076 only - Sep       5 2:00 1:00 S
>              Zone Asia/Gaza 2:00 -         EET   2012
>                             2:00 Palestine EE%sT
>      Without the fix, zic generates an incorrect TZif file, in which
>      the special-case 2076 transitions are omitted.  This causes ‘zdump
>      -ic 2076,2077 Asia/Gaza’ to mistakenly omit the lines:
>              2076-07-25      01      +02     EET
>              2076-09-05      03      +03     EEST    1
>      * zic.c (outzone): Redo algorithm to work even when the effect of
>      a Rule that never ends (TO="max") is interspersed with the effect
>      of a one-shot rule (TO="only").

So the issue appears running `2023d/zic -slim -d ... 2023[cd]/europe`?

Has anyone tried using tzdata 2023[cd] `make tzdata.zi` then

	2023d/zic -b slim -d ... tzdata.zi

to confirm if the issue still appears in Europe/London?

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry