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On Windows there is no API to get the current time zone as IANA name, instead Windows has its own zones. But there exists a mapping provided by the Unicode Consortium. This patch adds a script to convert the XML file with the mapping to a lookup table and adds a Windows code path to use that mapping. libstdc++-v3/Changelog: Implement std::chrono::current_zone() for Windows PR libstdc++/108409 * scripts/gen_windows_zones_map.py: New file, generates windows_zones-map.h. * src/c++20/windows_zones-map.h: New file, contains the look up table. * src/c++20/tzdb.cc (tzdb::current_zone): Add Windows code path. Signed-off-by: Björn Schäpers <bjoern@hazardy.de>
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