DuckDB Debian Source Package
============================

Bundled third-party libraries
------------------------------

The following have been replaced with system libraries:

  - zstd + xxhash  (USE_SYSTEM_ZSTD=TRUE)

  - ICU (WITH_INTERNAL_ICU=FALSE)
    The bundled ICU 66.1 contains a copy of double-conversion whose
    architecture detection table lacks several ports (loong64, etc.),
    causing build failures on those architectures. System ICU is currently ICU 78.3

C++ standard
------------

The build uses -DCMAKE_CXX_STANDARD=17 even though upstream defaults to
C++11. This is required because system ICU 75+ headers use C++17 features.


Known test failure with system ICU
------------------------------------

Results (BUILD_UNITTESTS=TRUE) with system ICU on amd64 (1.5.3-1):

./test/unittest

  test cases:   4491 |   4490 passed | 1 failed | 51 skipped

  test/sql/timezone/test_icu_calendar.test:81
  Mismatch on 1868-09-08: era=231 (Keiou 4) vs expected era=232 (Meiji 1)
  The test was written against bundled ICU 66.1. System ICU 78.3 uses
  updated historical calendar data for the Meiji era start date.
