Hi all, sorry for jumping in, but could the problem depend on the build environment you are using? E.g. mingw vs. Visual Studio on Windows? Martin Am 27.04.21 um 13:02 schrieb Manuela Friedrich via tz:
Hello Paul,
I rebuilt the latest git code but the zdump -v output is the same.
I created Abidjan-od-t-x1-win.txt and it is indeed different from your version. Note it is the same as for the released 2021a version though. Also the 2021a zdump -v worked fine on the 2021a Abidjan file.
Your zdump-2.diff produced the same result for me, see zdump-2-win.txt.
Regards Manuela Friedrich
-----Original Message----- From: Paul Eggert <eggert@cs.ucla.edu> Sent: Samstag, 24. April 2021 08:09 To: Manuela Friedrich <Manuela.Friedrich@actian.com> Cc: Steven Shuriff <Steven.Shuriff@actian.com>; Time zone mailing list <tz@iana.org> Subject: Re: iana build failures on Windows
On 4/22/21 11:22 PM, Manuela Friedrich wrote:
please find the tracing output attached.
Thanks. Here's the first line that differs between your output (-) and mine (+):
-TRACING: lotm_ok=1 tm_ok=1 only_ok=0 lot=-1830384001 t=-1830383664 tm={1911-364T23:49:28 dst=0} lotm={1911-364T23:43:51 dst=0} delta=337 t-lot=337 +TRACING: lotm_ok=1 tm_ok=1 only_ok=0 lot=-1830383326 t=-1830382989 tm={1912-000T00:16:51 dst=0} lotm={1911-364T23:55:06 dst=0} delta=1305 t-lot=337
This difference suggests that for TZ=Africa/Abidjan and the timestamp -1830383495, tzdb's localtime behaves differently on your platform than on mine, although the two platforms agree on -1830384001 and on -1830382989 (the point of disagreement is halfway between the two points of agreement). localtime should convert this timestamp to 1911-12-31 23:52:17 -00:16:08 LMT (with no DST), but evidently it converts to something else on your platform.
I see three things that could have gone wrong. First, while looking into this I noticed that relevant parts of zic.c and localtime.c rely on implementation-defined behavior when shifting or converting negative integers. Although I doubt that's your problem please try the latest GitHub tzdb development version, which has these fixes I installed today:
https://mm.icann.org/pipermail/tz/2021-April/030025.html https://mm.icann.org/pipermail/tz/2021-April/030024.html
Second, the TZif file for Africa/Abidjan could be incorrect on your platform, which would mean a portability bug in zic.c. I'm attaching my Abidjan file (it's binary data) along with Abidjan-od-t-x1.txt, the output of the shell command 'od -t x1 Africa/Abidjan' (it's a textual representation of that data). Please compare this to your Abidjan file, making sure that it's the actual Abidjan file you're using (you perhaps have multiple near-copies of that file on your system by now...).
Third, there could be a problem in tzdb's localtime code. To test this, please apply the attached patch zdump-2.diff to otherwise-unmodified source code and then run 'zdump Africa/Abidjan' (without the '-v'). The output I get is also attached as zdump-2.txt; what output do you get?
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