On 2024-03-22 10:02, Brian Inglis via Cygwin-apps wrote: > On 2024-03-21 03:36, Corinna Vinschen via Cygwin-apps wrote: >> On Mar 20 14:59, Brian Inglis via Cygwin-apps wrote: >>> On 2024-03-19 02:19, brian.inglis@systematicsw.ab.ca wrote: >>>> On 2024-03-18 21:12, Matt Johnson-Pint via tz wrote: >>>>> I just learned that Ubuntu Noble (24.04) decided to intentionally >>>>> split the tzdata package.  Old-style links such as US/Eastern are no >>>>> longer included by default, but are available in the tzdata-legacy >>>>> package instead. >>>>> >>>>> Just thought I'd share.  I wonder if other distributions / platforms >>>>> / libraries will follow suit.  What do y'all think? >>>>> >>>>> See: >>>>> >>>>> >>> >>>> I've been looking at that to reduce Cygwin CI and embedded build server >>>> setup overhead by limiting base install data to: >>>> >>>> - only the zones in zonenow.tab; >>>> - optionally those in zone1970.tab not in zonenow.tab; >>>> - additionally those in zone.tab in backward, and/or backzone; >>>> - possibly those not in zone.tab, only in backward, and/or backzone; >>>> - additions those in posix subtree, or right subtree. >>> >>> As tzdata maintainer, I would like to discuss on this list first, to take >>> advantage of a wide variety of experience in different environments with >>> different practices and requirements, before making more definite proposals >>> on the public list. >>> >>> Please see the attached log for prioritized subsets of tzdata for consideration: >>> [...] >>> What would the impact on tzset conversion from Windows to Olson tzdb be? >>> We would probably have to add all of these in to any minimal install. >>> I think I looked at that somewhere, sometime, not too long ago. >> >> We're generating the conversion from Windows to POSIX timezone via >> the conversion table from unicode.org: >> >> https://cygwin.com/cgit/newlib-cygwin/tree/winsup/utils/tzmap-from-unicode.org >> >> Plus a few (7, actually) mappings the Unicode consortium missed in >> the list (or maybe they are available in the meantime, needs checking). >> This is the minimum list of timezone info we need in the tzdata DB. > > I generated tzmap.h and generated differences since the last update cldr ~40. > I also searched in the latest for matches for each field attached as first. > > I do not know if they will be of help as I see you have already looked at tzmap. > > It looks as if the match might better prioritize country code over Windows label. The attached log shows the 449 time zones required to support the latest tzmap. Counts of each priority compared to all zones are: pri 1 87/ 91 zones src zonenow.tab pri 2 210/221 zones src zone1970.tab pri 3 101/132 zones src backzone pri 4 19/113 zones src backward pri 5 32/ 41 zones src files -- 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