Re: [BLFS Trac] #23234: libical-4.0.0

#23234: libical-4.0.0
-------------------------+--------------------------
 Reporter:  Bruce Dubbs  |       Owner:  Bruce Dubbs
     Type:  enhancement  |      Status:  assigned
 Priority:  normal       |   Milestone:  13.1
Component:  BOOK         |     Version:  git
 Severity:  normal       |  Resolution:
 Keywords:               |
-------------------------+--------------------------
Comment (by Bruce Dubbs):

 ## [4.0.0] - 2026-04-30

 This is a major release and is **not** source or binary compatible with
 version 3.x.

 Please see [Version 4 Migration Guide](MigrationGuide_to_4.md)
 for details about API changes since libical 3.x.

 Included in this release is a **Technical Preview (TP)** of our new
 library libicalvcard
 for handling VCARD formatted data.  We encourage users to try-out this new
 library
 and provide feedback to our issue tracker at
 <https://github.com/libical/libical/issues>.
 Note that the libicalvcard API is not finalized and no source or binary
 compatibility
 is guaranteed until sometime later in 4.x release cycle. Additionally,
 there are currently
 no C++ bindings available for libicalvcard (volunteers wanted).

 Please **do not** use libicalvcard for production or other non-
 experimental purposes
 until the Technical Preview phase is completed.

 ### Added

 - REUSE compliant licensing
 - Supports multi-valued parameters (DELEGATED-FROM, DELEGATED-TO, MEMBER,
 DISPLAY, FEATURE, etc)
 - Adds java bindings
 - (TP) Brand new icalvcard library that follows the libical API.
 - draft-ietf-calext-eventpub-extensions-19 (RFC 9073) support added
 - draft-ietf-calext-valarm-extensions-07 (RFC 9074) support added
 - Added support for Event Publishing (RFC 9073) and VALARM (RFC 9074)
 Extensions
 - New CMake option "LIBICAL_ENABLE_64BIT_ICALTIME_T" to use 64-bit
   time_t implementations on 32-bit systems (where available and
   supported.  Windows-only so far)
 - GEO property has arbitrary precision (values are internally stored as
 strings, not doubles)
 - Allow previous recurrence iteration
 - icalparser_ctrl setting defines how to handle invalid CONTROL characters
 during parsing
 - Full support for `BYSETPOS`, i.e. remove the limitation to MONTHLY and
 YEARLY frequencies
 - An API for setting/getting internal library limits (`icallimit_set` and
 `icallimit_get`)

 ### Changed

 - Built-in timezones updated to tzdata2026a to include historical data
 - Requires MSVC 2013 or higher (when building on Windows with MSVC)
 - Requires CMake v3.20.0 or higher
 - For the C++ bindings, requires a C++11 compliant C++ compiler
 - libical-glib requires glib 2.38 or higher
 - libical-glib requires a C11 compliant C compiler
 - Replace gtk-doc with gi-docgen to produce libical-glib developer
 documentation
 - libical-glib API is considered stable; no longer need to define
 LIBICAL_GLIB_UNSTABLE_API=1
   before including <libical-glib/libical-glib.h>
 - By default, only shared libraries are built; to get static libraries one
 must invoke
   separate build using the CMake `-DLIBICAL_STATIC=True` option.
 - CMake option -DGOBJECT_INTROSPECTION=True by default.
 - `icaltzutil_get_zone_directory()` can use the TZDIR environment to find
 system zoneinfo
 - `icaltimezone_set_tzid_prefix()` now allows setting an empty tzid
 prefix.
 - `icaldurationtype_from_int` and `icaldurationtype_as_int` have been
 renamed to
   `icaldurationtype_from_seconds` and `icaldurationtype_as_seconds`,
 respectively.
 - Components and properties with arbitrary iana-token names now are parsed
 with kind
   ICAL_IANA_COMPONENT and ICAL_IANA_PROPERTY if the
 `ical_unknown_token_handling`
   setting is ICAL_ASSUME_IANA_TOKEN. Otherwise, they are handled as error.
 - Property and parameter names that start with "x-" (lowercase) now also
   are parsed as X kind.
 - The `icalproperty_remove_parameter_by_(kind|name)` functions now remove
 all matching parameters.
   Before, they only removed the first matching parameter contrary to their
 documentation.
 - `icalrecurrencetype_new_from_string()` is more strict against overflows
 and empty rule parts.
   E.g. it now rejects RRULE parts like `BYDAY=255SU` (which used to be
 interpreted as `BYDAY=-1SU`).

 ### Deprecated

 - Several CMake options are renamed in favor of a "namespaced" equivalent.
   Please port your buildscripts to the new CMake option names.
   A complete list is provided in this "CMake options" section of the
   [Version 4 Migration Guide](MigrationGuide_to_4.md)

 ### Removed

 - The old src/python code is removed in favor of the glib-introspection
 generated
   Python bindings. Requires building with -DGOBJECT_INTROSPECTION=True

 ### Fixed

 - Fixed `icalcomponent_get_duration()` to account for DTEND/DUE TZID
 - Improved performance of recurrence iterators
 - Improved handling of BYWEEKNO when BYDAY is not present
 - Fixed `icalcomponent_get_dtend()` and
 `icalcomponent_foreach_recurrence()`
   to correctly handle nominal durations
 - Fixed `icalcomponent_foreach_recurrence` to filter out duplicate
   instances
-- 
Ticket URL: <https://wiki.linuxfromscratch.org/blfs/ticket/23234#comment:9>
BLFS Trac <https://wiki.linuxfromscratch.org/blfs/>
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